X-Git-Url: http://git.chise.org/gitweb/?a=blobdiff_plain;f=XmlExpr.cs;h=08954e8ebf0c57552c97a4b5caa89939d97288cf;hb=1886ee749147f8dd59897f13a3f4501ff483565a;hp=3efb27d500108c891207c99859fcb21b1f8348d3;hpb=3b60cbb4badfce6230a70ca54bfcb9d6ae4f5708;p=m17n%2Fm17n-lib-cs.git diff --git a/XmlExpr.cs b/XmlExpr.cs index 3efb27d..08954e8 100644 --- a/XmlExpr.cs +++ b/XmlExpr.cs @@ -2,73 +2,159 @@ using System; using System.Collections; using System.Collections.Generic; using System.IO; +using System.Reflection; +using System.Text; +using System.Text.RegularExpressions; using System.Xml; -namespace System.Xml.Expression +namespace System.Xml { - public class Xexpression + public static class Xexpression { - public static int debug_level = 0; + private static int trace_depth = 0; - public struct Name : IEquatable + public static int TraceDepth { + get { return trace_depth; } + set { trace_depth = value; } + } + + public class Error : Exception { - private static NameTable nt = new NameTable (); + private readonly Symbol name; + private Term[] stack; + private XmlNode node; - private string name; + public Error (Symbol name, XmlNode node, + string fmt, params object[] args) + : base (String.Format (fmt, args)) + { + this.name = name; + this.node = node; + } + + public Error (Symbol name, XmlNode node, Exception e, + string fmt, params object[] args) + : base (String.Format (fmt, args), e) + { + this.name = name; + this.node = node; + } - public Name (string str) + public Error (Symbol name, string fmt, params object[] args) + : base (String.Format (fmt, args)) { - name = nt.Add (str); + this.name = name; } - public static implicit operator Name (string str) + public Symbol Name { get { return name; } } + public XmlNode Node { + get { return node; } + internal set { node = value; } + } + public Term[] Stack { + get { return stack; } + internal set { stack = value; } + } + + public override string ToString () { - return new Name (str); + string str = (InnerException != null ? InnerException.ToString () + : base.ToString ()) + "\n" + "Xexpression:" + name + "\n"; + if (node != null) + str += " at " + node.OuterXml + "\n"; + if (stack != null) + { + str += "Call stack: "; + foreach (Term term in stack) + str += term.ToString (false); + } + return str; } - public static implicit operator string (Name name) + // All time errors. + // System.OutOfMemoryException or System.InsufficientMemoryException + public static Symbol MemoryError = "memory-error"; + // System.Exception + public static Symbol UnknownError = "unknown-error"; + public static Symbol WrongArgument = "wrong-argument"; + + // Load time errors. + public static Symbol InvalidInteger = "invalid-integer"; + public static Symbol TermTypeInvalid = "term-type-invalid"; + public static Symbol FunctionConflict = "function-conflict"; + public static Symbol VariableTypeConflict = "variable-type-conflict"; + public static Symbol VariableRangeConflict = "variable-range-conflict"; + public static Symbol VariableWrongRange = "variable-wrong-range"; + public static Symbol VariableWrongValue = "variable-wrong-value"; + + public static Symbol UnknownFunction = "unknown-function"; + public static Symbol MacroExpansionError = "macro-expansion-error"; + public static Symbol NoVariableName = "no-variable-anme"; + + // Run time errors. + public static Symbol ArithmeticError = "arithmetic-error"; + public static Symbol WrongType = "wrong-type"; + public static Symbol IndexOutOfRange = "index-out-of-range"; + public static Symbol ValueOutOfRange = "value-out-of-range"; + public static Symbol NoLoopToBreak = "no-loop-to-break"; + public static Symbol UncaughtThrow = "uncaught-throw"; + } + + public struct Symbol : IEquatable + { + private static NameTable nt = new NameTable (); + + private string name; + + public Symbol (string str) { name = nt.Add (str); } + + public static implicit operator Symbol (string str) { - return name.name; + return new Symbol (str); } - public static bool operator== (Name n1, Name n2) + public static implicit operator string (Symbol sym) { return sym.name; } + + public static bool operator== (Symbol n1, Symbol n2) { return (object) n1.name == (object) n2.name; } - public static bool operator!= (Name n1, Name n2) + public static bool operator!= (Symbol n1, Symbol n2) { return (object) n1.name != (object) n2.name; } - public static bool operator== (Name n1, string n2) + public static bool operator== (Symbol n1, string n2) { return (object) n1.name == (object) n2; } - public static bool operator!= (Name n1, string n2) + public static bool operator!= (Symbol n1, string n2) { return (object) n1.name != (object) n2; } - public static bool operator== (string n1, Name n2) + public static bool operator== (string n1, Symbol n2) { return (object) n1 == (object) n2.name; } - public static bool operator!= (string n1, Name n2) + public static bool operator!= (string n1, Symbol n2) { return (object) n1 != (object) n2.name; } - public bool Equals (Name name) + public bool Equals (Symbol name) { return Object.ReferenceEquals (this.name, name.name); } public override bool Equals (object obj) { - return Object.ReferenceEquals (this.name, obj); + return (obj is Symbol ? this == (Symbol) obj + : obj is string ? this.name == (string) obj + : false); } public override int GetHashCode () @@ -76,265 +162,429 @@ namespace System.Xml.Expression return name.GetHashCode (); } - public static NameTable Table { get { return nt; } } + public static NameTable NameTable { get { return nt; } } public override string ToString () { return name; } } - private static Name Nexpr = "expr"; + private static Symbol Qexpr = "expr"; - private static Name Nfuncall = "funcall"; - private static Name Nvarref = "varref"; - private static Name Ninteger = "integer"; - private static Name Nstring = "string"; - private static Name Nsymbol = "symbol"; - private static Name Nlist = "list"; + private static Symbol Qnull = ""; + private static Symbol Qfuncall = "funcall"; + private static Symbol Qinteger = "integer"; + private static Symbol Qstring = "string"; + private static Symbol Qsymbol = "symbol"; + private static Symbol Qlist = "list"; - private static Name Ndefun = "defun"; - private static Name Nfname = "fname"; - private static Name Nargs = "args"; - private static Name Nargs_unevalled = "args-unevalled"; - private static Name Nfixed = "fixed"; - private static Name Noptional = "optional"; - private static Name Nrest = "rest"; + public static Symbol Qdefun = "defun"; + public static Symbol Qdefmacro = "defmacro"; + private static Symbol Qfname = "fname"; + private static Symbol Qargs = "args"; + private static Symbol Qfixed = "fixed"; + private static Symbol Qoptional = "optional"; + private static Symbol Qrest = "rest"; - private static Name Ndefvar = "defvar"; - private static Name Nvname = "vname"; - private static Name Ndescription = "description"; - private static Name Nrange = "range"; + public static Symbol Qdefvar = "defvar"; + private static Symbol Qvname = "vname"; + private static Symbol Qdescription = "description"; + private static Symbol Qrange = "range"; - private static Name Nprogn = "progn"; - private static Name Nloop = "loop"; - private static Name Nfunction = "function"; + private static Symbol Qename = "ename"; - internal abstract class Function + public class Variable { - public Name name; - public int min_arg, max_arg; - - public Function () { } + public Domain domain; + public readonly Symbol name; + protected Term val; - public Function (Name name, int min_arg, int max_arg) + public Variable (Domain domain, Symbol name, Term val) { + this.domain = domain; this.name = name; - this.min_arg = min_arg; - this.max_arg = max_arg; + this.val = val; } - public abstract Term Call (Domain domain, Variable vari, Term[] args); + public Term Value { get { return val; } } - public override string ToString () + public virtual Term SetValue (Term val) { this.val = val; return val; } + + public virtual Variable Clone (Domain domain) { - return name; + return new Variable (domain, name, val); } - internal class Subroutine : Function + public virtual void Reset () { val = Zero; } + + public override string ToString () { return name + "(" + val + ")"; } + + public abstract class Typed : Variable { - public Builtin builtin; - public bool setvar; + protected string desc; + private Term default_val; - public Subroutine (Builtin builtin, Name name, bool setvar, - int min_arg, int max_arg) - : base (name, min_arg, max_arg) + protected Typed (Domain domain, Symbol name, Term val, string desc) + : base (domain, name, val) { - this.builtin = builtin; + this.desc = desc; + default_val = val; } - public override Term Call (Domain domain, Variable vari, Term[] args) - { - Term[] newargs = new Term[args.Length]; + public override void Reset () { val = default_val; } + + public string Description { + get { return desc; } + set { desc = value; } + } - for (int i = 0; i < args.Length; i++) - newargs[i] = args[i].Eval (domain); - return builtin (domain, vari, newargs); + public override Term SetValue (Term val) + { + if (! CheckValue (val)) + throw new Error (Error.VariableWrongValue, + "Wrong value for variable {0}: {1}", + name, val); + this.val = val; + return val; } + + public abstract bool CheckValue (Term val); } - internal class SpecialForm : Function + public class IntType : Typed { - public Builtin builtin; + private int[] range; - public SpecialForm (Builtin builtin, Name name, - int min_arg, int max_arg) - : base (name, min_arg, max_arg) + public bool IsSubrange (int[] r) { - this.builtin = builtin; + if (range == null) + return true; + for (int i = 0; i < r.Length; i += 2) + { + int j; + for (j = 0; j < range.Length; j += 2) + if (range[j] <= r[i] && range[j + 1] >= r[i + 1]) + break; + if (j >= range.Length) + return false; + } + return true; } - public override Term Call (Domain domain, Variable vari, Term[] args) + public IntType (Domain domain, Symbol name, int n, string desc, + int[] range) + : base (domain, name, new Term (n), desc) + { + if (range != null && range.Length % 2 == 1) + throw new Error (Error.VariableWrongRange, + "Range length for {0} not even", name); + this.range = range; + CheckValue (val); + } + + public override bool CheckValue (Term term) { - return builtin (domain, vari, args); + if (term.IsInt) + { + if (range == null) + return true; + int n = term.Intval; + for (int i = 0; i < range.Length; i += 2) + if (range[i] <= n && range[i + 1] >= n) + return true; + } + return false; + } + + public override Variable Clone (Domain domain) + { + return new IntType (domain, name, val.Intval, desc, range); } + + public int[] Range { get { return range; } set { range = value; } } } - internal class Lambda : Function + public class StrType : Typed { - internal bool args_evalled; - internal Variable[] args; - internal Term[] body; + private string[] range; + + public bool IsSubrange (string[] r) + { + if (range == null) + return true; + for (int i = 0; i < r.Length; i++) + { + int j; + for (j = 0; j < range.Length; j++) + if (range[j] == r[i]) + break; + if (j >= range.Length) + return false; + } + return true; + } + + public StrType (Domain domain, Symbol name, Str str, string desc, + string[] range) + : base (domain, name, new Term (str), desc) + { + this.range = range; + CheckValue (val); + } - public Lambda (XmlNode node, Domain domain) + public override bool CheckValue (Term val) { - int nfixed = 0; - int noptional = 0; - int nrest = 0; - name = node.Attributes[Nfname].Value; - - node = node.FirstChild; - if (node != null - && (node.Name == Nargs || node.Name == Nargs_unevalled)) - { - XmlNode n; - args_evalled = node.Name == Nargs; - for (n = node.FirstChild; n != null; n = n.NextSibling) - { - if (n.Name == Nfixed) - nfixed++; - else if (n.Name == Noptional) - noptional++; - else if (n.Name == Nrest) - nrest++; - else - throw new Exception ("Invalid argument type: " + n); - } - min_arg = nfixed; - max_arg = nfixed + noptional + nrest; - args = new Variable[max_arg]; - n = node.FirstChild; - for (int i = 0; i < max_arg; n = n.NextSibling) - args[i++] = domain.Defvar ((Name) n.Attributes[0].Value); - if (nrest == 1) - max_arg = - max_arg; - } - else + if (val.IsStr) { - min_arg = max_arg = 0; + if (range == null) + return true; + Str str = val.Strval; + foreach (string s in range) + if (str.Equals (s)) + return true; } + return false; } - public void SetBody (XmlNode node, Domain domain) + public override Variable Clone (Domain domain) { - for (node = node.FirstChild; node != null; node = node.NextSibling) - if (node.Name != Ndescription - && node.Name != Nargs - && node.Name != Nargs_unevalled) - break; - int nterms = 0; - for (XmlNode n = node; n != null; n = n.NextSibling) - nterms++; - if (nterms > 0) - { - body = new Term[nterms]; - for (nterms = 0; node != null; node = node.NextSibling, nterms++) - body[nterms] = new Term (node, domain); - } + return new StrType (domain, name, val.Strval, desc, range); } - public override Term Call (Domain domain, Variable vari, Term[] args) - { - Bindings current = domain.bindings; - Term result = Zero; + public string[] Range { get { return range; } set { range = value; } } + } - try { - int i; - if (args_evalled) + public class SymType : Typed + { + public Symbol[] range; + + public bool IsSubrange (Symbol[] r) + { + if (range == null) + return true; + for (int i = 0; i < r.Length; i++) { - Term[] newargs = new Term[args.Length]; - for (i = 0; i < min_arg; i++) - newargs[i] = args[i].Eval (domain); - args = newargs; + int j; + for (j = 0; j < range.Length; j++) + if (range[j] == r[i]) + break; + if (j >= range.Length) + return false; } - for (i = 0; i < min_arg; i++) - domain.Bind (this.args[i], args[i]); - if (body != null) - foreach (Term term in body) - result = term.Eval (domain); - } finally { - domain.UnboundTo (current); + return true; } - return result; + + public SymType (Domain domain, Symbol name, Symbol sym, string desc, + Symbol[] range) + : base (domain, name, new Term (sym), desc) + { + this.range = range; + CheckValue (val); + } + + public override bool CheckValue (Term val) + { + if (val.IsSymbol) + { + if (range == null) + return true; + Symbol sym = val.Symval; + foreach (Symbol n in range) + if (sym == n) + return true; + } + return false; + } + + public override Variable Clone (Domain domain) + { + return new SymType (domain, name, val.Symval, desc, range); } + + public Symbol[] Range { get { return range; } set { range = value; } } } } - public abstract class Variable + public abstract class Function { - public readonly Name name; - internal Term val; + public Symbol name; + // True iff the function can be called with vname="VNAME" attribute. + internal readonly bool with_var; + // Minimum number of positional arguments. + internal readonly int min_args; + // If non-nengative, maximum number of arguments. If negative, + // maxinum number of positional arguments is (-1 - max_args), + // and the remaining unlimit number of arguments are given as a + // single list. + internal readonly int max_args; + + public delegate Term Builtin (Domain domain, Variable vari, Term[] terms); + + public Function () { } - public Variable (Name name, Term term) + public Function (Symbol name, bool with_var, int min_args, int max_args) { this.name = name; - Value = term; + this.with_var = with_var; + this.min_args = min_args; + this.max_args = max_args; + } + + public abstract Term Call (Domain domain, Variable vari, Term[] args); + + public override string ToString () + { + return name; } - public Term Value + internal class Subroutine : Function { - get { return val; } - set + public Builtin builtin; + + public Subroutine (Builtin builtin, Symbol name, bool with_var, + int min_args, int max_args) + : base (name, with_var, min_args, max_args) { - if (! ValueP (value)) - throw new Exception ("Invalid value of " + name + ": " + value); - val = value; + this.builtin = builtin; } + + public override Term Call (Domain domain, Variable vari, Term[] args) + { + if (args.Length > 0) + { + args = (Term[]) args.Clone (); + for (int i = 0; i < args.Length; i++) + { + args[i] = args[i].Eval (domain); + if (domain.Thrown ()) + return args[i]; + } + } + return builtin (domain, vari, args); + } } - public abstract bool ValueP (Term term); + internal class SpecialForm : Function + { + public Builtin builtin; - public override string ToString () { return name + "(" + val + ")"; } + public SpecialForm (Builtin builtin, Symbol name, bool with_var, + int min_args, int max_args) + : base (name, with_var, min_args, max_args) + { + this.builtin = builtin; + } - internal class Int : Variable - { - public struct Range + public override Term Call (Domain domain, Variable vari, Term[] args) { - public int from, to; + return builtin (domain, vari, args); } + } + + internal class Lambda : Function + { + private Variable[] args; + private Term[] body; - public Range[] ranges; + public Lambda (Symbol name, int min_args, int max_args, Variable[] args, + Term[] body) + : base (name, false, min_args, max_args) + { + this.args = args; + this.body = body; + } - public Int (Name name, int i) : base (name, new Term (i)) { } + public void SetBody (Term[] body) + { + this.body = body; + } - public override bool ValueP (Term term) + public override Term Call (Domain domain, Variable vari, Term[] args) { - int i; + Bindings current = domain.bindings; + Term result = Zero; + int limit = max_args >= 0 ? args.Length : args.Length - 1; - if (term.objval != null) - return false; - if (ranges == null) - return true; - i = term.intval; - foreach (Range r in ranges) - if (i >= r.from && i <= r.to) - return true; - return false; + try { + for (int i = 0; i < limit; i++) + { + result = args[i].Eval (domain); + if (domain.Thrown ()) + return result; + domain.Bind (this.args[i], result); + } + if (max_args < 0) + { + List list = new List (); + list.InsertRange (0, args[limit].Listval); + + for (int i = 0; i < list.Count; i++) + { + result = list[i].Eval (domain); + if (domain.Thrown ()) + return result; + list[i] = result; + } + domain.Bind (this.args[limit], new Term (list)); + } + try { + domain.Catch (CatchTag.Return); + foreach (Term term in body) + { + result = term.Eval (domain); + if (domain.Thrown ()) + return result; + } + } finally { + domain.Uncatch (); + } + } finally { + domain.UnboundTo (current); + } + return result; } } - internal class Str : Variable + internal class Macro : Function { - public string[] ranges; + private Variable[] args; + private Term[] body; - public Str (Name name, string str) : base (name, new Term (str)) { } + public Macro (Symbol name, int min_args, int max_args, Variable[] args, + Term[] body) + : base (name, false, min_args, max_args) + { + this.args = args; + this.body = body; + } - public override bool ValueP (Term term) + public void SetBody (Term[] body) { - if (! (term.objval is string)) - return false; - if (ranges == null) - return true; - string str = (string) term.objval; - foreach (string s in ranges) - if (s == str) - return true; - return false; + this.body = body; } - } - internal class Misc : Variable - { - public Misc (Name name, Term term) : base (name, term) { } + public override Term Call (Domain domain, Variable vari, Term[] args) + { + Bindings current = domain.bindings; + Term result = Zero; - public override bool ValueP (Term term) { return true; } + try { + for (int i = 0; i < args.Length; i++) + domain.Bind (this.args[i], args[i]); + try { + domain.Catch (CatchTag.Return); + foreach (Term term in body) + { + result = term.Eval (domain); + if (domain.Thrown ()) + break; + } + } finally { + domain.Uncatch (); + } + } finally { + domain.UnboundTo (current); + } + return result; + } } } @@ -347,14 +597,14 @@ namespace System.Xml.Expression private Bindings (Variable vari) { this.vari = vari; - old_value = vari.val; + old_value = vari.Value; } public static Bindings Bind (Bindings bindings, Variable vari, Term val) { Bindings b = new Bindings (vari); - b.vari.Value = val; + b.vari.SetValue (val); b.next = bindings; return b; } @@ -362,7 +612,7 @@ namespace System.Xml.Expression internal Bindings UnboundTo (Bindings boundary) { for (Bindings b = this; b != boundary; b = b.next) - b.vari.val = b.old_value; + b.vari.SetValue (b.old_value); return boundary; } @@ -375,60 +625,64 @@ namespace System.Xml.Expression } } -#if false - internal class ThrowException : Exception - { - Name tag; - public object value; - - public ThrowException (Name tag, object value) : base () - { - this.tag = tag; - this.value = value; - } - } -#endif - internal struct CatchTag { - public readonly Name name; - public readonly int count; + private Term tag; + public Term Tag { get { return tag; } } - public CatchTag (Name name, int count) - { - this.name = name; - this.count = count; - } + // Normal symbolic catch-tag. + public CatchTag (Symbol sym) { tag = new Term (sym); } + // Special catch-tag for return and break. + private CatchTag (int i) { tag = new Term (i); } + + public static CatchTag Return = new CatchTag (0); + public static CatchTag Break = new CatchTag (1); } public class Domain { + public Symbol name; public object context; public int depth = 0; - - internal Dictionary functions; - internal Dictionary variables; + private Stack call_stack = new Stack (); + + internal Dictionary termtypes + = new Dictionary (); + internal Dictionary functions + = new Dictionary (); + internal Dictionary variables + = new Dictionary (); internal Bindings bindings; - internal Stack catch_list = new Stack (); + private Stack catch_stack = new Stack (); private int catch_count = 0; - internal Domain () - { - functions = new Dictionary (); - variables = new Dictionary (); - } + internal Domain (Symbol name) { this.name = name; } + + public Domain (Symbol name, object context) + : this (name, basic, context) { } - public Domain (object context) : this (basic, context) + public Domain (Symbol name, Domain parent, object context) : this (name) { + termtypes = new Dictionary (parent.termtypes); + functions = new Dictionary (parent.functions); + variables = new Dictionary (parent.variables); + this.context = context; } - public Domain (Domain parent, object context) + public int CallStackCount { get { return call_stack.Count; } } + + public void CallStackPush (Term term) { call_stack.Push (term); } + + public void CallStackPop () { call_stack.Pop (); } + + public void CallStackPop (int count) { - functions = new Dictionary (parent.functions); - variables = new Dictionary (parent.variables); - this.context = context; + while (count < call_stack.Count) + call_stack.Pop (); } + public Term[] CallStack { get { return call_stack.ToArray (); } } + internal void Bind (Variable vari, Term value) { bindings = Bindings.Bind (bindings, vari, value); @@ -440,160 +694,287 @@ namespace System.Xml.Expression bindings = bindings.UnboundTo (boundary); } - internal void Catch (Name name) + internal void Catch (CatchTag tag) + { + catch_stack.Push (tag); + catch_count++; + } + + internal void Uncatch () { - catch_list.Push (new CatchTag (name, catchcount++)); + catch_stack.Pop (); + if (catch_count > catch_stack.Count) + catch_count--; } - internal bool Catched { - get { return catch_list.Peek ().count == catchcount; } + public bool Thrown () { return catch_count < catch_stack.Count; } + + public bool Thrown (out bool caught) + { + if (catch_count < catch_stack.Count) + { + caught = catch_count == catch_stack.Count - 1; + return true; + } + caught = false; + return false; } internal void ThrowReturn () { - catch_list.Peek ().count = catchcount; + foreach (CatchTag elt in catch_stack) + { + catch_count--; + if (elt.Tag == CatchTag.Return.Tag) + break; + } } internal void ThrowBreak () { - catch_list.Peek ().count = catchcount; + if (catch_stack.Peek ().Tag != CatchTag.Break.Tag) + throw new Error (Error.NoLoopToBreak, + "No surrounding loop to break"); + catch_count--; } - internal void Uncatch () + internal void ThrowSymbol (Term tag) + { + int i = catch_count; + foreach (CatchTag elt in catch_stack) + { + i--; + if (elt.Tag.Matches (tag)) + { + catch_count = i; + return; + } + } + throw new Error (Error.UncaughtThrow, + "No corresponding catch: {0}", tag); + } + + public void DefType (Type type) + { + if (! type.IsSubclassOf (typeof (TermValue))) + throw new Error (Error.TermTypeInvalid, + "Not a subclass of TermValue: {0}", type); + BindingFlags flags = BindingFlags.Static | BindingFlags.NonPublic; + FieldInfo finfo = type.GetField ("name", flags); + if (finfo == null || finfo.FieldType != typeof (Symbol)) + throw new Error (Error.TermTypeInvalid, + "No \"name\" field of string type: {0}", type); + Symbol name = (Symbol) finfo.GetValue (null); + if (termtypes.ContainsKey (name)) + throw new Error (Error.TermTypeInvalid, + "Already defined: {0}", name); + if (functions.ContainsKey (name)) + throw new Error (Error.TermTypeInvalid, + "Already defined as a function or a macro: {0}", + name); + Type[] types = new Type[] { typeof (Domain), typeof (XmlNode) }; + MethodInfo parser = type.GetMethod ("Parser", types); + if (parser == null || parser.ReturnType != typeof (TermValue)) + throw new Error (Error.TermTypeInvalid, + "No \"Parser\" method of correct type: {0}", type); + termtypes[name] = parser; + } + + private void check_func_head (Symbol name, bool with_var, + int min_args, int max_args, bool as_macro) { - catch_list.Pop (); + if (termtypes.ContainsKey (name)) + throw new Error (Error.FunctionConflict, + "Already defined as a term type: {0}", name); + Function func; + if (functions.TryGetValue (name, out func)) + { + if ((func is Function.Macro) != as_macro) + throw new Error (Error.FunctionConflict, + "Already defined as a {0}: {1}", + as_macro ? "function" : "macro", name); + if (func.with_var != with_var + || func.min_args != min_args + || func.max_args != max_args) + throw new Error (Error.FunctionConflict, + "Conflicting arguments: {0}", name); + } } - public void DefSubr (Builtin builtin, string str, bool setvar, - int min_arg, int max_arg, params string[] aliases) + public void DefSubr (Function.Builtin builtin, Symbol name, + bool with_var, int min_args, int max_args) { - Name name = str; - Function func = new Function.Subroutine (builtin, name, setvar, - min_arg, max_arg); - functions[name] = func; - foreach (string a in aliases) - functions[(Name) a] = func; + check_func_head (name, with_var, min_args, max_args, false); + functions[name] = new Function.Subroutine (builtin, name, with_var, + min_args, max_args); } - public void DefSpecial (Builtin builtin, string str, - int min_arg, int max_arg, - params string[] aliases) + public void DefSpecial (Function.Builtin builtin, Symbol name, + bool with_var, int min_args, int max_args) { - Name name = str; - Function func = new Function.SpecialForm (builtin, name, - min_arg, max_arg); - functions[name] = func; - foreach (string a in aliases) - functions[(Name) a] = func; + check_func_head (name, with_var, min_args, max_args, false); + functions[name] = new Function.SpecialForm (builtin, name, with_var, + min_args, max_args); } - public void DefAlias (string alias, string str) + public void Defun (Symbol name, int min_args, int max_args, + Variable[] args, Term[] body) { - functions[(Name) alias] = functions[(Name) str]; + check_func_head (name, false, min_args, max_args, false); + functions[name] = new Function.Lambda (name, min_args, max_args, + args, body); } - internal Function.Lambda RegisterFunction (XmlNode node) + public void Defun (Function func) { - Function.Lambda lambda = new Function.Lambda (node, this); + functions[func.name] = func; + } - functions[lambda.name] = lambda; - return lambda; + public void Defmacro (Symbol name, int min_args, int max_args, + Variable[] args, Term[] body) + { + check_func_head (name, false, min_args, max_args, true); + functions[name] = new Function.Macro (name, min_args, max_args, + args, body); } - internal Function Defun (XmlNode node) + public void DefAlias (Symbol alias, Symbol fname) { - Name name = node.Attributes[Nfname].Value; Function func; + if (termtypes.ContainsKey (alias)) + throw new Error (Error.FunctionConflict, + "Alread defined as a term type: {0}", alias); + if (functions.ContainsKey (alias)) + throw new Error (Error.FunctionConflict, + "Alread defined as a function: {0}", alias); + if (! functions.TryGetValue (fname, out func)) + throw new Error (Error.UnknownFunction, fname); + functions[alias] = func; + } - if (! functions.TryGetValue (name, out func)) - func = RegisterFunction (node); - ((Function.Lambda) func).SetBody (node, this); - return func; + public Variable Defvar (Variable vari) + { + vari = vari.Clone (this); + variables[vari.name] = vari; + return vari; } - public void Defvar (XmlNode node) + internal Variable Defvar (Symbol name) { - Name name = node.Attributes[0].Value; Variable vari; - node = node.FirstChild; - if (node.Name == Ndescription) - node = node.NextSibling; - if (node != null) + if (variables.TryGetValue (name, out vari)) { - Name type = node.Name; - XmlNodeList range_list = null; - int nranges = 0; - string val = node.InnerText; - - node = node.NextSibling; - if (node != null) - { - range_list = node.ChildNodes; - nranges = range_list.Count; - } + Variable.Typed typed = vari as Variable.Typed; + if (typed != null) + throw new Error (Error.VariableTypeConflict, + "Not a non-typed variable: {0}", name); + } + else + { + vari = new Variable (this, name, Zero); + variables[name] = vari; + } + return vari; + } + + public Variable DefvarInt (Symbol name, int n, string desc, int[] range) + { + Variable vari; - if (type == Ninteger) + if (variables.TryGetValue (name, out vari)) + { + Variable.IntType intvari = vari as Variable.IntType; + if (intvari == null) + throw new Error (Error.VariableTypeConflict, + "Not an integer variable: {0}", name); + if (range != null) { - Variable.Int vi = new Variable.Int (name, parse_integer (val)); - if (range_list != null) - { - vi.ranges = new Variable.Int.Range[nranges]; - - for (int i = 0; i < nranges; i++) - { - XmlNode n = range_list[i]; - - if (n.Name == Nrange) - { - vi.ranges[i].from = - parse_integer (n.FirstChild.InnerText); - vi.ranges[i].to = - parse_integer (n.LastChild.InnerText); - } - else - { - int num = parse_integer (n.InnerText); - vi.ranges[i].from = vi.ranges[i].to = num; - } - } - } - vari = vi; + if (! intvari.IsSubrange (range)) + throw new Error (Error.VariableRangeConflict, + "Conflicting variable range: {0}", name); + intvari.Range = range;; } - else if (type == Nstring) + if (desc != null) + intvari.Description = desc; + } + else + { + vari = new Variable.IntType (this, name, n, desc, range); + variables[name] = vari; + } + return vari; + } + + public Variable DefvarStr (Symbol name, string str, string desc, + string[] range) + { + Variable vari; + + if (variables.TryGetValue (name, out vari)) + { + Variable.StrType strvari = vari as Variable.StrType; + if (strvari == null) + throw new Error (Error.VariableTypeConflict, + "Not a string variable: {0}", name); + if (range != null) { - Variable.Str vs = new Variable.Str (name, val); - if (range_list != null) - vs.ranges = new string[nranges]; - for (int i = 0; i < nranges; i++) - vs.ranges[i] = range_list[i].Value; - vari = vs; + if (! strvari.IsSubrange (range)) + throw new Error (Error.VariableRangeConflict, + "Conflicting variable range: {0}", name); + strvari.Range = range; } - else - throw new Exception ("Unknown type: " + type); + if (desc != null) + strvari.Description = desc; } else - vari = new Variable.Misc (name, Zero); - variables[name] = vari; + { + vari = new Variable.StrType (this, name, new Str (str), desc, + range); + variables[name] = vari; + } + return vari; } - internal Variable Defvar (Name name) + public Variable DefvarSym (Symbol name, Symbol sym, string desc, + Symbol[] range) { - Variable vari = new Variable.Misc (name, Zero); - variables[name] = vari; + Variable vari; + + if (variables.TryGetValue (name, out vari)) + { + Variable.SymType symvari = vari as Variable.SymType; + if (symvari == null) + throw new Error (Error.VariableTypeConflict, + "Not a symbol variable: {0}", name); + if (range != null) + { + if (! symvari.IsSubrange (range)) + throw new Error (Error.VariableRangeConflict, + "Conflicting variable range: {0}", name); + symvari.Range = range; + } + if (desc != null) + symvari.Description = desc; + } + else + { + vari = new Variable.SymType (this, name, sym, desc, range); + variables[name] = vari; + } return vari; } - internal Function GetFunc (Name name) + internal Function GetFunc (Symbol name) { Function func; - if (! functions.TryGetValue (name, out func)) - throw new Exception ("Unknown function: " + name); + throw new Error (Error.UnknownFunction, + "Unknown function: {0}", name); return func; } - public bool CopyFunc (Domain domain, Name name) + public bool CopyFunc (Domain domain, Symbol name) { Function func = GetFunc (name); @@ -603,27 +984,36 @@ namespace System.Xml.Expression public void CopyFunc (Domain domain) { - foreach (KeyValuePair kv in functions) + foreach (KeyValuePair kv in functions) domain.functions[kv.Key] = kv.Value; } - internal Variable GetVar (Name name) + public Variable GetVarCreate (Symbol name) + { + Variable vari; + + if (! variables.TryGetValue (name, out vari)) + variables[name] = vari = new Variable (this, name, Zero); + return vari; + } + + public Variable GetVar (Symbol name) { Variable vari; if (! variables.TryGetValue (name, out vari)) - variables[name] = vari = new Variable.Misc (name, Zero); + return null; return vari; } public override string ToString () { string str = "<(functions"; - foreach (KeyValuePair kv in functions) + foreach (KeyValuePair kv in functions) str += " " + kv.Key; str += ") (variabls"; - foreach (KeyValuePair kv in variables) - str += " " + kv.Key; + foreach (KeyValuePair kv in variables) + str += " " + kv.Value; str += ")"; if (bindings != null) str += " " + bindings; @@ -633,105 +1023,144 @@ namespace System.Xml.Expression return str; } - internal void DebugWrite (bool head, string fmt, params string[] arg) + internal void TraceWrite (string fmt, params string[] arg) { - if (debug_level > depth) + if (trace_depth > depth) { - if (head) - { - Console.WriteLine (); - for (int i = 0; i < depth; i++) - Console.Write (" "); - } - Console.Write (fmt, arg); + for (int i = 0; i < depth; i++) + Console.Write (" "); + Console.WriteLine (fmt, arg); } } - } - public delegate Term Builtin (Domain domain, Variable vari, Term[] args); + public object SaveValues () + { + Dictionary values = new Dictionary (); + + foreach (KeyValuePair kv in variables) + values[kv.Value] = kv.Value.Value.Clone (); + return values; + } - private static Domain basic = new Domain (); + public void RestoreValues (object values) + { + foreach (KeyValuePair kv + in (Dictionary) values) + kv.Key.SetValue (kv.Value); + } + } - internal static Function Fprogn; + private static Domain basic = new Domain ("basic"); static Xexpression () { - basic.DefSubr (set_value, "set", true, 1, 1, "="); - basic.DefSubr (not, "not", false, 1, 1, "!"); - basic.DefSubr (add, "add", true, 1, -1, "+"); - basic.DefSubr (mul, "mul", true, 1, -1, "*"); - basic.DefSubr (sub, "sub", true, 1, -1, "-"); - basic.DefSubr (div, "div", true, 1, -1, "/"); - basic.DefSubr (mod, "mod", true, 1, 2, "%"); - basic.DefSubr (logior, "logior", true, 1, -1, "|"); - basic.DefSubr (logand, "logand", true, 1, -1, "&"); - basic.DefSubr (lsh, "lsh", true, 1, 2, "<<"); - basic.DefSubr (rsh, "rsh", true, 1, 2, ">>"); - basic.DefSubr (eq, "eq", false, 2, -1, "=="); - basic.DefSubr (noteq, "noteq", false, 2, 2, "!="); - basic.DefSubr (less_than, "lt", false, 2, -1, "<"); - basic.DefSubr (less_eq, "le", false, 2, -1, "<="); - basic.DefSubr (greater_than, "gt", false, 2, -1, ">"); - basic.DefSubr (greater_eq, "ge", false, 2, -1, ">="); - basic.DefSubr (append, "append", true, 0, -1); - basic.DefSubr (concat, "concat", true, 0, -1); - basic.DefSubr (nth, "nth", false, 2, 2); - basic.DefSubr (copy, "copy", false, 1, 1); - basic.DefSubr (ins, "ins", true, 2, 2); - basic.DefSubr (del, "del", true, 2, 2); - basic.DefSubr (eval_clause, "eval", false, 1, 1); - basic.DefSubr (break_clause, "break", false, 0, 1); - basic.DefSubr (return_clause, "return", false, 1, 1); - basic.DefSpecial (and, "and", 1, -1, "&&"); - basic.DefSpecial (or, "or", 1, -1, "||"); - basic.DefSpecial (progn_clause, "progn", 0, -1, "expr"); - basic.DefSpecial (if_clause, "if", 2, 3); - basic.DefSpecial (when_clause, "when", 1, -1); - basic.DefSpecial (loop_clause, "loop", 1, -1); - basic.DefSpecial (while_clause, "while", 1, -1); - basic.DefSpecial (cond_clause, "cond", 1, -1); - basic.DefSpecial (foreach_clause, "foreach", 2, -1); - basic.DefSpecial (quote_clause, "quote", 1, 1); - basic.DefSpecial (type_clause, "type", 1, 1); - - Fprogn = basic.GetFunc (Nprogn); - } - - private static Term set_value (Domain domain, Variable vari, Term[] args) - { - vari.Value = args[0]; - return vari.val; - } - - private static Term not (Domain domain, Variable vari, Term[] args) + basic.DefType (typeof (Varref)); + basic.DefType (typeof (Funcall)); + basic.DefType (typeof (ErrorTerm)); + + basic.DefSubr (Fset, "set", true, 1, 1); + basic.DefAlias ("=", "set"); + basic.DefSubr (Fnot, "not", false, 1, 1); + basic.DefAlias ("!", "not"); + basic.DefSubr (Fadd, "add", true, 1, -1); + basic.DefAlias ("+", "add"); + basic.DefSubr (Fmul, "mul", true, 1, -1); + basic.DefAlias ("*", "mul"); + basic.DefSubr (Fsub, "sub", true, 1, -1); + basic.DefAlias ("-", "sub"); + basic.DefSubr (Fdiv, "div", true, 1, -1); + basic.DefAlias ("/", "div"); + basic.DefSubr (Fmod, "mod", true, 1, 2); + basic.DefAlias ("%", "mod"); + basic.DefSubr (Flogior, "logior", true, 1, -1); + basic.DefAlias ("|", "logior"); + basic.DefSubr (Flogand, "logand", true, 1, -1); + basic.DefAlias ("&", "logand"); + basic.DefSubr (Flsh, "lsh", true, 1, 2); + basic.DefAlias ("<<", "lsh"); + basic.DefSubr (Frsh, "rsh", true, 1, 2); + basic.DefAlias (">>", "rsh"); + basic.DefSubr (Feq, "eq", false, 2, -1); + basic.DefAlias ("==", "eq"); + basic.DefSubr (Fnoteq, "noteq", false, 2, 2); + basic.DefAlias ("!=", "noteq"); + basic.DefSubr (Flt, "lt", false, 2, -1); + basic.DefAlias ("<", "lt"); + basic.DefSubr (Fle, "le", false, 2, -1); + basic.DefAlias ("<=", "le"); + basic.DefSubr (Fgt, "gt", false, 2, -1); + basic.DefAlias (">", "gt"); + basic.DefSubr (Fge, "ge", false, 2, -1); + basic.DefAlias (">=", "ge"); + + basic.DefSubr (Fappend, "append", true, 0, -1); + basic.DefSubr (Fconcat, "concat", true, 0, -1); + basic.DefSubr (Fnth, "nth", false, 2, 2); + basic.DefSubr (Fcopy, "copy", false, 1, 1); + basic.DefSubr (Fins, "ins", true, 2, 2); + basic.DefSubr (Fdel, "del", true, 2, 2); + basic.DefSubr (Feval, "eval", false, 1, 1); + basic.DefSubr (Fbreak, "break", false, 0, 1); + basic.DefSubr (Freturn, "return", false, 0, 1); + basic.DefSubr (Fthrow, "throw", false, 1, 2); + + basic.DefSpecial (Fand, "and", false, 1, -1); + basic.DefAlias ("&&", "and"); + basic.DefSpecial (For, "or", false, 1, -1); + basic.DefAlias ("||", "or"); + basic.DefSpecial (Fprogn, "progn", false, 0, -1); + basic.DefAlias ("expr", "progn"); + basic.DefSpecial (Fif, "if", false, 2, 3); + basic.DefSpecial (Fwhen, "when", false, 1, -1); + basic.DefSpecial (Floop, "loop", false, 1, -1); + basic.DefSpecial (Fwhile, "while", false, 1, -1); + basic.DefSpecial (Fcond, "cond", false, 1, -1); + basic.DefSpecial (Fforeach, "foreach", true, 2, -1); + basic.DefSpecial (Fquote, "quote", false, 1, 1); + basic.DefSpecial (Ftype, "type", false, 1, 1); + basic.DefSpecial (Fcatch, "catch", true, 2, -1); + } + + private static Term Fset (Domain domain, Variable vari, Term[] args) + { + if (vari == null) + throw new Error (Error.NoVariableName, "No variable name to set"); + vari.SetValue (args[0]); + return args[0]; + } + + private static Term Fnot (Domain domain, Variable vari, Term[] args) { return args[0].IsTrue ? Zero : One; } - private static Term add (Domain domain, Variable vari, Term[] args) + static Term maybe_set_intvar (Variable vari, int n) + { + Term term = new Term (n); + if (vari != null) + vari.SetValue (term); + return term; + } + + + private static Term Fadd (Domain domain, Variable vari, Term[] args) { - int n = vari == null ? 0 : vari.val.Intval; + int n = vari == null ? 0 : vari.Value.Intval; foreach (Term arg in args) - n += (int) arg; - if (vari == null) - return n; - vari.val.intval = n; - return vari.val; + n += arg.Intval; + return maybe_set_intvar (vari, n); } - private static Term mul (Domain domain, Variable vari, Term[] args) + private static Term Fmul (Domain domain, Variable vari, Term[] args) { - int n = vari == null ? 1 : vari.val.Intval; + int n = vari == null ? 1 : vari.Value.Intval; foreach (Term arg in args) - n *= (int) arg; - if (vari == null) - return n; - vari.val.intval = n; - return vari.val; + n *= arg.Intval; + return maybe_set_intvar (vari, n); } - private static Term sub (Domain domain, Variable vari, Term[] args) + private static Term Fsub (Domain domain, Variable vari, Term[] args) { int n, i; @@ -742,18 +1171,15 @@ namespace System.Xml.Expression } else { - n = vari.val.Intval; + n = vari.Value.Intval; i = 0; } while (i < args.Length) - n -= (int) args[i++]; - if (vari == null) - return n; - vari.val.intval = n; - return vari.val; + n -= args[i++].Intval; + return maybe_set_intvar (vari, n); } - private static Term div (Domain domain, Variable vari, Term[] args) + private static Term Fdiv (Domain domain, Variable vari, Term[] args) { int n, i; @@ -764,37 +1190,28 @@ namespace System.Xml.Expression } else { - n = vari.val.Intval; + n = vari.Value.Intval; i = 0; } while (i < args.Length) n /= args[i++].Intval; - if (vari == null) - return n; - vari.val.intval = n; - return vari.val; + return maybe_set_intvar (vari, n); } - private static Term mod (Domain domain, Variable vari, Term[] args) + private static Term Fmod (Domain domain, Variable vari, Term[] args) { - if (vari == null) - return (args[0].Intval % args[1].Intval); - vari.val.intval = vari.val.Intval % args[0].Intval; - return vari.val; + return maybe_set_intvar (vari, args[0].Intval % args[1].Intval); } - private static Term logior (Domain domain, Variable vari, Term[] args) + private static Term Flogior (Domain domain, Variable vari, Term[] args) { - int n = vari == null ? 0 : vari.val.Intval; + int n = vari == null ? 0 : vari.Value.Intval; foreach (Term arg in args) - n |= (int) arg; - if (vari == null) - return n; - vari.val.intval = n; - return vari.val; + n |= arg.Intval; + return maybe_set_intvar (vari, n); } - private static Term logand (Domain domain, Variable vari, Term[] args) + private static Term Flogand (Domain domain, Variable vari, Term[] args) { int n, i; @@ -805,34 +1222,25 @@ namespace System.Xml.Expression } else { - n = vari.val.Intval; + n = vari.Value.Intval; i = 0; } while (i < args.Length) - n &= (int) args[i++]; - if (vari == null) - return n; - vari.val.intval = n; - return vari.val; + n &= args[i++].Intval; + return maybe_set_intvar (vari, n); } - private static Term lsh (Domain domain, Variable vari, Term[] args) + private static Term Flsh (Domain domain, Variable vari, Term[] args) { - if (vari == null) - return args[0].Intval << args[1].Intval; - vari.val.intval = vari.val.Intval << args[0].Intval; - return vari.val; + return maybe_set_intvar (vari, args[0].Intval << args[1].Intval); } - private static Term rsh (Domain domain, Variable vari, Term[] args) + private static Term Frsh (Domain domain, Variable vari, Term[] args) { - if (vari == null) - return args[0].Intval >> args[1].Intval; - vari.val.intval = vari.val.Intval >> args[0].Intval; - return vari.val; + return maybe_set_intvar (vari, args[0].Intval >> args[1].Intval); } - private static Term eq (Domain domain, Variable vari, Term[] args) + private static Term Feq (Domain domain, Variable vari, Term[] args) { Term o = args[0]; @@ -851,18 +1259,18 @@ namespace System.Xml.Expression return One; } - private static Term noteq (Domain domain, Variable vari, Term[] args) + private static Term Fnoteq (Domain domain, Variable vari, Term[] args) { - return eq (domain, vari, args); + return Feq (domain, vari, args); } - private static Term less_than (Domain domain, Variable vari, Term[] args) + private static Term Flt (Domain domain, Variable vari, Term[] args) { - int n = (int) args[0]; + int n = args[0].Intval; for (int i = 1; i < args.Length; i++) { - int n1 = (int) args[i]; + int n1 = args[i].Intval; if (n >= n1) return Zero; n = n1; @@ -870,12 +1278,12 @@ namespace System.Xml.Expression return One; } - private static Term less_eq (Domain domain, Variable vari, Term[] args) + private static Term Fle (Domain domain, Variable vari, Term[] args) { - int n = (int) args[0]; + int n = args[0].Intval; for (int i = 1; i < args.Length; i++) { - int n1 = (int) args[i]; + int n1 = args[i].Intval; if (n > n1) return Zero; n = n1; @@ -883,12 +1291,12 @@ namespace System.Xml.Expression return One; } - private static Term greater_than (Domain domain, Variable vari, Term[] args) + private static Term Fgt (Domain domain, Variable vari, Term[] args) { - int n = (int) args[0]; + int n = args[0].Intval; for (int i = 1; i < args.Length; i++) { - int n1 = (int) args[i]; + int n1 = args[i].Intval; if (n <= n1) return Zero; n = n1; @@ -896,12 +1304,12 @@ namespace System.Xml.Expression return One; } - private static Term greater_eq (Domain domain, Variable vari, Term[] args) + private static Term Fge (Domain domain, Variable vari, Term[] args) { - int n = (int) args[0]; + int n = args[0].Intval; for (int i = 1; i < args.Length; i++) { - int n1 = (int) args[i]; + int n1 = args[i].Intval; if (n < n1) return Zero; n = n1; @@ -909,14 +1317,14 @@ namespace System.Xml.Expression return One; } - private static Term append (Domain domain, Variable vari, Term[] args) + private static Term Fappend (Domain domain, Variable vari, Term[] args) { List list; if (vari == null) list = new List (); else - list = vari.val.Listval; + list = vari.Value.Listval; foreach (Term arg in args) { @@ -932,182 +1340,168 @@ namespace System.Xml.Expression result.objval = list; return result; } - vari.val.objval = list; - return vari.val; + return vari.Value; } - private static Term concat (Domain domain, Variable vari, Term[] args) + private static Term Fconcat (Domain domain, Variable vari, Term[] args) { - string str; - - if (vari == null) - str = ""; - else - str = vari.val.Strval; + Str str = vari == null ? new Str ("") : vari.Value.Strval; foreach (Term arg in args) { if (arg.IsStr) - str += (string) arg.objval; + str.Insert (-1, arg.Strval); else if (arg.IsList) - foreach (Term term in (List) arg.objval) - str += (char) term.Intval; + foreach (Term term in arg.Listval) + str.Insert (-1, (char) term.Intval); else - str += (char) arg.Intval; - } - if (vari == null) - { - Term result; - result.intval = 0; - result.objval = str; - return result; + str.Insert (-1, (char) arg.Intval); } - vari.val.objval = str; - return vari.val; + return vari == null ? new Term (str) : vari.Value; } - private static Term nth (Domain domain, Variable vari, Term[] args) + private static Term Fnth (Domain domain, Variable vari, Term[] args) { - Term result; - if (args[1].IsStr) - { - result.intval = ((string) args[1].objval)[args[0].Intval]; - result.objval = null; - } - else if (args[1].IsList) - { - result = ((List) args[1].objval)[args[0].Intval]; - } - else - throw new Exception ("Term is not enumelable: " + args[1]); - return result; + return new Term (args[1].Strval.Nth (args[0].Intval)); + if (args[1].IsList) + return args[1].Listval[args[0].Intval]; + throw new Error (Error.WrongType, + "Not a string nor a list: {0}", args[1]); } - private static Term copy (Domain domain, Variable vari, Term[] args) + private static Term Fcopy (Domain domain, Variable vari, Term[] args) { - Term result; - - result.intval = 0; - result.objval = new List (args[0].Listval); - return result; + return args[0].Clone (); } - private static Term ins (Domain domain, Variable vari, Term[] args) + private static Term Fins (Domain domain, Variable vari, Term[] args) { - if (vari.val.IsStr) - vari.val.objval - = vari.val.Strval.Insert (args[0].Intval, args[1].Strval); - else if (vari.val.IsList) - vari.val.Listval.InsertRange (args[0].Intval, args[1].Listval); + if (vari == null) + throw new Error (Error.NoVariableName, "No variable name to set"); + if (vari.Value.IsStr) + vari.Value.Strval.Insert (args[0].Intval, args[1].Strval); + else if (vari.Value.IsList) + vari.Value.Listval.InsertRange (args[0].Intval, args[1].Listval); else - throw new Exception ("term is not collection: " + vari.val); - return vari.val; + throw new Error (Error.WrongType, "Not a string nor a list: {0}", + vari.Value); + return vari.Value; } - private static Term del (Domain domain, Variable vari, Term[] args) + private static Term Fdel (Domain domain, Variable vari, Term[] args) { - if (vari.val.IsStr) - vari.val.objval - = vari.val.Strval.Remove (args[0].Intval, - args[1].Intval - args[0].Intval); - - else if (vari.val.IsList) - vari.val.Listval.RemoveRange (args[0].Intval, - args[1].Intval - args[0].Intval); + if (vari == null) + throw new Error (Error.NoVariableName, "No variable name to set"); + if (vari.Value.IsStr) + vari.Value.Strval.Delete (args[0].Intval, args[1].Intval); + else if (vari.Value.IsList) + vari.Value.Listval.RemoveRange (args[0].Intval, + args[1].Intval - args[0].Intval); else - throw new Exception ("term is not collection: " + vari.val); - return vari.val; + throw new Error (Error.WrongType, "Not a string nor a list: {0}", + vari.Value); + return vari.Value; } - private static Term and (Domain domain, Variable vari, Term[] args) + private static Term Fand (Domain domain, Variable vari, Term[] args) { foreach (Term arg in args) - if (! arg.Eval (domain).IsTrue) - return Zero; + { + Term result = arg.Eval (domain); + if (domain.Thrown ()) + result; + if (! result.IsTrue) + return Zero; + } return One; } - private static Term or (Domain domain, Variable vari, Term[] args) + private static Term For (Domain domain, Variable vari, Term[] args) { foreach (Term arg in args) - if (arg.Eval (domain).IsTrue) - return One; + { + Term result = arg.Eval (domain); + if (domain.Thrown ()) + return result; + if (result.IsTrue) + return One; + } return Zero; } - private static Term eval_clause (Domain domain, Variable vari, Term[] args) + private static Term Feval (Domain domain, Variable vari, Term[] args) { return (args[0].Eval (domain)); } - private static Term progn_clause (Domain domain, Variable vari, Term[] args) + private static Term Fprogn (Domain domain, Variable vari, Term[] args) { Term result = One; foreach (Term arg in args) - result = arg.Eval (domain); + { + result = arg.Eval (domain); + if (domain.Thrown ()) + return result; + } return result; } - private static Term if_clause (Domain domain, Variable vari, Term[] args) + private static Term Fif (Domain domain, Variable vari, Term[] args) { - if (args[0].Eval (domain).IsTrue) + Term result = args[0].Eval (domain); + + if (domain.Thrown) + return result; + if (result.IsTrue) return args[1].Eval (domain); if (args.Length == 2) return Zero; return args[2].Eval (domain); } - private static Term when_clause (Domain domain, Variable vari, Term[] args) + private static Term Fwhen (Domain domain, Variable vari, Term[] args) { - if (! args[0].Eval (domain).IsTrue) + Term result = args[0].Eval (domain); + + if (domain.Thrown) + return result; + if (! result.IsTrue) return Zero; - Term result = One; + result = One; for (int i = 1; i < args.Length; i++) - result = args[i].Eval (domain); + { + result = args[i].Eval (domain); + if (domain.Thrown) + return result; + } return result; } - private static Term break_clause (Domain domain, Variable vari, Term[] args) + private static Term Freturn (Domain domain, Variable vari, Term[] args) { - Stack clist = domain.catch_list; - if (clist.Count == 0) - throw new Exception ("No outer loop to break"); - CatchTag tag = clist.Peek (); - if (tag.name != Nloop) - throw new Exception ("No outer loop to break"); - domain.depth = tag.depth; + domain.ThrowReturn (); return args.Length == 0 ? Zero : args[0]; } - private static Term return_clause (Domain domain, Variable vari, Term[] args) + private static Term Fbreak (Domain domain, Variable vari, Term[] args) { - Stack clist = domain.catch_list; - - while (clist.Count > 0) - { - CatchTag tag = clist.Pop (); - if (tag.name == Nfunction) - { - domain.depth = tag.depth; - return = args.Length == 0 ? Zero : args[0]; - } - } + domain.ThrowBreak (); return args.Length == 0 ? Zero : args[0]; } - private static Term loop_clause (Domain domain, Variable vari, Term[] args) + private static Term Floop (Domain domain, Variable vari, Term[] args) { - domain.Catch (Nloop); Term result = Zero; try { - while (! domain.Catched) + domain.Catch (CatchTag.Break); + while (! domain.Thrown ()) foreach (Term arg in args) { result = arg.Eval (domain); - if (domain.Catched) - break; + if (domain.Thrown ()) + return result; } } finally { domain.Uncatch (); @@ -1115,15 +1509,25 @@ namespace System.Xml.Expression return result; } - private static Term while_clause (Domain domain, Variable vari, Term[] args) + private static Term Fwhile (Domain domain, Variable vari, Term[] args) { - while (args[0].Eval (domain).IsTrue) - for (int i = 1; i < args.Length; i++) - args[i].Eval (domain); - return Zero; + Term result = Zero; + try { + domain.Catch (CatchTag.Break); + while (! domain.Thrown () && args[0].Eval (domain).IsTrue) + for (int i = 1; i < args.Length; i++) + { + result = args[i].Eval (domain); + if (domain.Thrown ()) + return result; + } + } finally { + domain.Uncatch (); + } + return result; } - private static Term cond_clause (Domain domain, Variable vari, Term[] args) + private static Term Fcond (Domain domain, Variable vari, Term[] args) { foreach (Term arg in args) { @@ -1133,171 +1537,529 @@ namespace System.Xml.Expression if (result.IsTrue) { for (int i = 1; i < list.Count; i++) - result = list[i].Eval (domain); + { + domain.depth++; + result = list[i].Eval (domain); + domain.depth--; + if (domain.Thrown ()) + return result; + } return result; } } return Zero; } - private static Term foreach_clause (Domain domain, Variable vari, - Term[] args) + private static Term Fforeach (Domain domain, Variable vari, Term[] args) { - List list = args[0].Listval; + Term result = args[0].Eval (domain); + if (domain.Thrown ()) + return result; + List list = result.Listval; Bindings current = domain.bindings; - foreach (Term term in list) - { - domain.Bind (vari, term); - try { - for (int i = 1; i < args.Length; i++) - args[i].Eval (domain); - } finally { - domain.UnboundTo (current); + try { + domain.Catch (CatchTag.Break); + foreach (Term term in list) + { + domain.Bind (vari, term); + try { + for (int i = 1; i < args.Length; i++) + { + result = args[i].Eval (domain); + if (domain.Thrown ()) + return result; + } + } finally { + domain.UnboundTo (current); + } } - } - return Zero; + } finally { + domain.Uncatch (); + } + return result; } - private static Term quote_clause (Domain domain, Variable vari, Term[] args) + private static Term Fquote (Domain domain, Variable vari, Term[] args) { - return new Term (args[0]); + return args[0]; } - private static Term type_clause (Domain domain, Variable vari, Term[] args) + private static Term Ftype (Domain domain, Variable vari, Term[] args) { if (args[0].IsInt) return TermInt; if (args[0].IsStr) return TermStr; - if (args[0].IsName) - return TermName; + if (args[0].IsSymbol) + return TermSymbol; if (args[0].IsList) return TermList; return TermTerm; } - public struct Term + private static Term eval_terms (Domain domain, Term[] terms, int idx, + out bool caught) { - public int intval; - public object objval; + Term result= Zero; - public Term (int i) { intval = i; objval = null; } - public Term (Name name) { intval = 0; objval = name; } - public Term (string str) { intval = 0; objval = str; } - public Term (List list) { intval = 0; objval = list; } - public Term (Term term) { intval = 0; objval = term; } + caught = false; + for (int i = idx; i < terms.Length; i++) + { + result = terms[i].Eval (domain); + if (domain.Thrown (out caught)) + return result; + } + return result; + } - public Term (XmlNode node, Domain domain) + public static Term Fcatch (Domain domain, Variable vari, Term[] args) + { + Term result; + bool caught = false; + + if (args.Length < 2) + throw new Error (Error.WrongArgument, + "Too few arguments: {0}", args.Length); + ErrorTerm err = args[0].objval as ErrorTerm; + if (err != null) { - Name name = node.Name; + try { + result = eval_terms (domain, args, 1, out caught); + } catch (System.Exception exception) { + Term term; - if (name == Ninteger) - { - intval = parse_integer (node.InnerText); - objval = null; - } - else - { - intval = 0; - if (name == Nsymbol) - objval = (Name) node.InnerText; - else if (name == Nstring) - objval = node.InnerText.Clone (); - else if (name == Nvarref) - objval = domain.GetVar ((Name) node.Attributes[0].Value); - else if (name == Nlist) - { - List list = new List (); - for (node = node.FirstChild; node != null; - node = node.NextSibling) - list.Add (new Term (node, domain)); - objval = list; - } - else - { - Function func; - Variable vari = null; - Term[] args; - - if (name == Nfuncall) - name = node.Attributes[0].Value; - else if (node.Attributes[Nvname] != null) - vari = domain.GetVar (node.Attributes[Nvname].Value); - func = domain.GetFunc (name); - XmlNodeList nlist = node.ChildNodes; - int nargs = nlist.Count; - - if (nargs < func.min_arg - || (func.max_arg >= 0 && nargs > func.max_arg)) - throw new Exception ("Invalid number of arguments to: " - + name + " " + nargs); - args = new Term[nargs]; - for (int i = 0; i < nlist.Count; i++) - args[i] = new Term (nlist[i], domain); - objval = new Funcall (func, vari, args); - } - } + Error e = exception as Error; + if (e != null) + term = new Term (new ErrorTerm (e.Name, e.Message, e.Stack)); + else + term = new Term (new ErrorTerm (exception)); + if (! args[0].Matches (term)) + throw exception; + if (vari != null) + vari.SetValue (term); + return One; + } } + else if (args[0].IsSymbol) + { + try { + domain.Catch (new CatchTag (args[0].Symval)); + result = eval_terms (domain, args, 1, out caught); + if (caught) + { + if (vari != null) + vari.SetValue (result); + return One; + } + return Zero; + } finally { + domain.Uncatch (); + } + } + throw new Error (Error.WrongArgument, + "Not a symbol nor an error: {0}", args[0]); + } + + public static Term Fthrow (Domain domain, Variable vari, Term[] args) + { + if (args[0].IsSymbol) + { + domain.ThrowSymbol (args[0]); + return (args[args.Length - 1]); + } + if (args[0].IsError) + { + ErrorTerm err = (ErrorTerm) args[0].objval; + throw new Error (err.ErrorName, err.ErrorMessage); + } + throw new Error (Error.WrongArgument, + "Not a symbol nor an error: {0}", args[0]); + } - private class Funcall + public abstract class TermValue + { + public virtual Term Eval (Domain domain) { return new Term (this); } + public virtual TermValue Clone () { return this; } + public virtual bool IsTrue { get { return true; } } + public virtual bool Matches (TermValue other) { return Equals (other); } + public override abstract bool Equals (object obj); + public override abstract int GetHashCode (); + public virtual string ToString (bool detail) { return ToString (); } + } + + private class Varref : TermValue + { + private static Symbol name = "varref"; + public static Symbol Name { get { return name; } } + + private Symbol vname; + private Variable vari; + + public Varref (Symbol vname) { this.vname = vname; } + + public override Term Eval (Domain domain) { - internal Function func; - internal Variable vari; - internal Term[] args; + if (vari == null || vari.domain != domain) + vari = domain.GetVarCreate (vname); + return vari.Value; + } - public Funcall (Function func, Variable vari, Term[] args) + public static TermValue Parser (Domain domain, XmlNode node) + { + return new Varref ((Symbol) node.Attributes[Qvname].Value); + } + + public override bool Equals (object obj) + { + Varref varref = obj as Varref; + return (varref != null && varref.vari.name == vari.name); + } + + public override int GetHashCode () + { + return vari.name.GetHashCode (); + } + + public override string ToString () { return ToString (true); } + + public override string ToString (bool detail) + { + return ""; + } + } + + private class Funcall : TermValue + { + private static Symbol name = "funcall"; + public static Symbol Name { get { return name; } } + private static Term[] null_args = new Term[0]; + + internal Function func; + internal Variable vari; + internal Term[] args; + + public Funcall (Function func, Variable vari, Term[] args) { + if (args == null) + args = null_args; + int nargs = args.Length; + if (nargs < func.min_args + || (func.max_args >= 0 && nargs > func.max_args)) + throw new Error (Error.WrongArgument, + "Wrong number of arguments to {0}: {1}", + func.name, nargs); + if (! func.with_var && vari != null) + throw new Error (Error.WrongArgument, + "Wrong vname attribute to {0}: {1}", + func.name, vari.name); this.func = func; this.vari = vari; this.args = args; } - public Term Eval (Domain domain) - { - domain.DebugWrite (true, "(({0}", func.name); - for (int i = 0; i < args.Length; i++) - domain.DebugWrite (false, " {0}", args[i].ToString ()); - domain.DebugWrite (false, ")"); + public static TermValue Parser (Domain domain, XmlNode node) + { + Symbol fname = node.Name; + XmlAttribute attr; + + if (fname == Qfuncall) + fname = node.Attributes[Qfname].Value; + Function func = domain.GetFunc (fname); + Variable vari; + attr = node.Attributes[Qvname]; + vari = attr == null ? null : domain.GetVarCreate (attr.Value); + XmlNodeList nlist = node.ChildNodes; + int nargs = nlist.Count; + Term[] args = new Term[nargs]; + for (int i = 0; i < nargs; i++) + args[i] = Parse (domain, nlist[i]); + return new Funcall (func, vari, args); + } + + public override Term Eval (Domain domain) + { + Term result; + domain.TraceWrite (ToString ()); + try { domain.depth++; - Term result = func.Call (domain, vari, args); + result = func.Call (domain, vari, args); + } finally { domain.depth--; - domain.DebugWrite (true, " ==> {0})", result.ToString ()); - return result; } + domain.TraceWrite ("=> {0}", result.ToString ()); + return result; + } - public override string ToString () - { - string str = ""; - str += "\">"; + public override TermValue Clone () + { + return new Funcall (func, vari, args); + } + + public override bool Equals (object obj) + { + Funcall funcall = obj as Funcall; + return (obj != null + && funcall.func == func + && funcall.vari == vari + && funcall.args.Length == args.Length); + } + + public override int GetHashCode () + { + return func.GetHashCode () ^ args.Length; + } + + public override string ToString () { return ToString (true); } + + public override string ToString (bool detail) + { + string str = "<" + func.name; + if (vari != null) + { + str += " vname=\"" + vari.name + "\""; + if (detail) + str += " val=" + vari.Value.ToString (); + } + if (args.Length == 0 || ! detail) + return str + "/>"; + str += ">"; + if (func is Function.SpecialForm) + { + for (int i = 0; i < args.Length; i++) + str += "."; + } + else foreach (Term e in args) str += e; - return (str + ""); + return (str + ""); + } + } + + internal class ErrorTerm : TermValue + { + private static Symbol name = "error"; + public static Symbol Name { get { return name; } } + + private readonly Symbol ename; + public Symbol ErrorName { get { return ename; } } + private string message; + public string ErrorMessage { get { return message; } } + private Term[] stack; + + public ErrorTerm (Symbol ename, string message) + : this (ename, message, null) { } + + internal ErrorTerm (Symbol ename, string message, Term[] stack) + { + this.ename = ename; + this.message = message; + this.stack = stack; + } + + internal ErrorTerm (Exception e) + { + if (e is ArithmeticException) + ename = Error.ArithmeticError; + else if (e is IndexOutOfRangeException) + ename = Error.IndexOutOfRange; + else if (e is InsufficientMemoryException + || e is OutOfMemoryException) + ename = Error.MemoryError; + else + ename = Error.UnknownError; + message = e.Message; + } + + public static TermValue Parser (Domain domain, XmlNode node) + { + XmlAttribute attr = node.Attributes[Qename]; + Symbol ename = attr == null ? Qnull : (Symbol) attr.Value; + string message = node.InnerText; + return new ErrorTerm (ename, message); + } + + public Term[] CallStack { + get { return stack; } + internal set { stack = value; } + } + + public override TermValue Clone () + { + return new ErrorTerm (ename, message); + } + + public override bool Equals (object obj) + { + ErrorTerm e = obj as ErrorTerm; + return (e != null && e.ename == ename && e.message == message + && (e.stack == null ? stack == null + : (stack != null && e.stack.Length == stack.Length))); + } + + public override int GetHashCode () + { + return ename.GetHashCode (); + } + + public override bool Matches (TermValue term) + { + ErrorTerm e = term as ErrorTerm; + return (e != null && (ename == Qnull || e.ename == ename)); + } + + public override string ToString () { return ToString (true); } + + public override string ToString (bool detail) + { + string str = ""; + if (message != null) + str += message; + if (stack != null) + for (int i = 0; i < stack.Length; i++) + str += stack[i].ToString (false); + return str + ""; + } + } + + public class Str + { + private string str; + private Regex regex; + + public Str (string str) { this.str = str; } + + public Str Clone (Str str) { return new Str (str.str); } + + public bool Equals (string str) { return this.str == str; } + + public bool Equals (Str str) { return this.str == str.str; } + + public bool Matches (Str str) + { + if (regex != null) + regex = new Regex (this.str); + return regex.IsMatch (str.str); + } + + public int Nth (int index) { return (int) str[index]; } + + public void Insert (int index, Str str) + { + if (index < 0) + this.str = this.str + str.str; + else + this.str = this.str.Insert (index, str.str); + regex = null; + } + + public void Insert (int index, char c) + { + if (index < 0) + this.str = this.str + c; + else + this.str = this.str.Insert (index, new string (c, 1)); + regex = null; + } + + public void Delete (int from, int to) + { + this.str = this.str.Remove (from, to - from); + regex = null; + } + + public override string ToString () { return str; } + } + + public struct Term + { + public int intval; + public object objval; + + // ... + public Term (int i) { intval = i; objval = null; } + // ... + public Term (Symbol name) { intval = 0; objval = name; } + // ... + public Term (string str) { intval = 0; objval = new Str (str); } + // ... + public Term (List list) { intval = 0; objval = list; } + // ERROR-MESSASGE + public Term (Symbol name, string message) + { + intval = 0; + objval = new ErrorTerm (name, message); + } + + public Term (Str str) { intval = 0; objval = str; } + public Term (TermValue obj) { intval = 0; objval = obj; } + + // + public Term (Domain domain, Symbol vname) + { + intval = 0; + objval = new Varref (vname); + } + + // ... + public Term (Domain domain, Symbol fname, Term[] args) + : this (domain, fname, Qnull, args) { } + + // ... + public Term (Domain domain, Symbol fname, Symbol vname, Term[] args) + { + intval = 0; + + Function func = domain.GetFunc (fname); + Variable vari = vname == Qnull ? null : domain.GetVarCreate(vname); + Funcall funcall = new Funcall (func, vari, args); + if (func is Function.Macro) + { + Term result = funcall.Eval (domain); + intval = result.intval; + objval = result.objval; + } + else + objval = funcall; + } + + public object Objval { + get { + if (objval == null) + throw new Error (Error.WrongType, + "term is an integer: {0}", this); + return objval; } } public int Intval { get { if (objval != null) - throw new Exception ("term is not integer: " + this); + throw new Error (Error.WrongType, "{0} is not an integer", this); return intval; } } - public string Strval { + public Str Strval { get { if (! IsStr) - throw new Exception ("term is not string: " + this); - return (string) objval; + throw new Error (Error.WrongType, "{0} is not a string", this); + return (Str) objval; + } + } + + public string Symval { + get { + if (! IsSymbol) + throw new Error (Error.WrongType, "{0} is not a symbol", this); + return (Symbol) objval; } } public List Listval { get { if (! IsList) - throw new Exception ("term is not list: " + this); + throw new Error (Error.WrongType, "{0} is not a list"); return (List) objval; } } @@ -1308,189 +2070,484 @@ namespace System.Xml.Expression ? (intval != 0) : objval is List ? (((List) objval).Count != 0) + : objval is TermValue + ? ((TermValue) objval).IsTrue : true); } } + public bool IsInt { get { return (objval == null); } } - public bool IsStr { get { return (objval is string); } } - public bool IsName { get { return (objval is Name); } } + public bool IsStr { get { return (objval is Str); } } + public bool IsSymbol { get { return (objval is Symbol); } } public bool IsList { get { return (objval is List); } } + public bool IsError { get { return (objval is ErrorTerm); } } - public Term Eval (Domain domain) + internal Term Eval (Domain domain) { - if (objval == null || objval is Name || objval is string) + if (objval == null || objval is Symbol || objval is Str + || objval is List) return this; - if (objval is List) - return new Term ((List) objval); - if (objval is Funcall) - return ((Funcall) objval).Eval (domain); - if (objval is Variable) - return ((Variable) objval).val; - if (objval is Term) - return (Term) objval; - throw new Exception ("invalid Term object: " + objval); + try { + domain.CallStackPush (this); + return ((TermValue) objval).Eval (domain); + } catch (Error e) { + if (e.Stack == null) + e.Stack = domain.CallStack; + throw e; + } finally { + domain.CallStackPop (); + } } - public static explicit operator int (Term term) + public Term Clone () { - if (term.objval != null) - throw new Exception ("Not an integer term: " + term); - return term.intval; + if (objval == null || objval is Symbol) + return this; + if (objval is Str) + return new Term (((Str) objval).ToString ()); + if (objval is List) + { + List list = new List (); + list.InsertRange (0, ((List) objval)); + return new Term (list); + } + return new Term (((TermValue) objval).Clone ()); } - public static explicit operator Name (Term term) + public static bool operator== (Term t1, Term t2) + { + return t1.Equals (t2); + } + + public static bool operator!= (Term t1, Term t2) { return ! (t1 == t2); } + + public override bool Equals (object obj) { - return (Name) term.objval; + if (! (obj is Term)) + return false; + Term term = (Term) obj; + if (IsInt) + return term.IsInt && term.Intval == Intval; + if (IsSymbol) + return term.IsSymbol && term.Symval == Symval; + if (IsStr) + return (term.IsStr && term.Strval.Equals (Strval)); + if (IsList) + { + if (! term.IsList) + return false; + List l1 = objval as List; + List l2 = term.objval as List; + + if (l1.Count != l2.Count) + return false; + for (int i = 0; i < l1.Count; i++) + if (! l1[i].Equals (l2[i])) + return false; + return true; + } + return ((TermValue) objval).Equals (obj); } - public static implicit operator Term (int i) + public override int GetHashCode () { return intval; } + + public bool Matches (Term term) { - return new Term (i); + if (IsInt) + return term.IsInt && Intval == term.Intval; + if (IsSymbol) + return term.IsSymbol && Symval == term.Symval; + if (IsStr) + return term.IsStr && Strval.Matches (term.Strval); + if (IsList) + { + if (! term.IsList) + return false; + List l1 = objval as List; + List l2 = term.objval as List; + + if (l1.Count > l2.Count) + return false; + for (int i = 0; i < l1.Count; i++) + if (! l1[i].Equals (l2[i])) + return false; + return true; + } + return ((TermValue) objval).Matches ((TermValue) term.objval); } - public override string ToString () + public override string ToString () { return ToString (true); } + + public string ToString (bool detail) { string str; if (objval == null) str = "" + intval + ""; - else if (objval is Name) + else if (objval is Symbol) str = "" + objval + ""; - else if (objval is string) + else if (objval is Str) str = "" + objval + ""; else if (objval is List) { - str = ""; - foreach (Term e in (List) objval) - str += e; - str += ""; + if (detail) + { + str = ""; + foreach (Term e in (List) objval) + str += e; + str += ""; + } + else + str = ""; } - else if (objval is Funcall) - str = ""; - else if (objval is Variable) - str = ""; else if (objval is Term) str = "" + objval + ""; else - throw new Exception ("invalid Term object: " + objval); + str = ((TermValue) objval).ToString (detail); return str; } } - static Term Zero = new Term (0); - static Term One = new Term (1); - static Term TermInt = new Term (Ninteger); - static Term TermStr = new Term (Nstring); - static Term TermName = new Term (Nsymbol); - static Term TermList = new Term (Nlist); - static Term TermTerm = new Term ((Name) "term"); + private static Term Zero = new Term (0); + private static Term One = new Term (1); + private static Term TermInt = new Term (Qinteger); + private static Term TermStr = new Term (Qstring); + private static Term TermSymbol = new Term (Qsymbol); + private static Term TermList = new Term (Qlist); + private static Term TermTerm = new Term ((Symbol) "term"); - internal static int parse_integer (string str) + private static int parse_integer (XmlNode node) { + string str = node.InnerText; int len = str.Length; - bool negative = false; + int i, c; - if (len <= 1) - return (len == 0 ? 0 : str[0] - '0'); + if (len == 2 && str[0] == '?') + return str[1]; + if (len > 2 + && str[1] == 'x' && ((c = str[0]) == '0' || c == '#')) + { + if (! int.TryParse (str.Substring (2), + Globalization.NumberStyles.HexNumber, null, + out i)) + throw new Error (Error.InvalidInteger, node, + "Not a integer string: {0}", str); + return i; + } + if (! int.TryParse (str, out i)) + throw new Error (Error.InvalidInteger, node, + "Not a integer string: {0}", str); + return i; + } - int c = str[0]; - int i; + private static Symbol parse_defvar (Domain domain, XmlNode node) + { + XmlAttribute name = node.Attributes[Qvname]; + if (name == null) + throw new Error (Error.NoVariableName, node, + "No variable name to define"); + Symbol vname = name.Value; + String desc; + Variable vari; + + node = node.FirstChild; + if (node != null && node.Name == Qdescription) + { + desc = node.InnerText; + node = node.NextSibling; + } + else + desc = null; + if (node != null) + { + Symbol type = node.Name; + XmlNodeList range_list = null; + int nranges = 0; + XmlNode n = node.NextSibling; - if (c == '0' && str[1] == 'x') + if (n != null) + { + range_list = n.ChildNodes; + nranges = range_list.Count; + } + + if (type == Qinteger) + { + int val = parse_integer (node); + int[] range = null; + if (range_list != null) + { + range = new int[nranges * 2]; + for (int i = 0; i < nranges; i++) + { + XmlNode nd = range_list[i]; + if (nd.Name == Qrange) + { + range[i * 2] = parse_integer (nd.FirstChild); + range[i * 2 + 1] = parse_integer (nd.LastChild); + } + else + { + range[i * 2] = range[i * 2 + 1] + = parse_integer (nd.FirstChild); + } + } + } + vari = domain.DefvarInt (vname, val, desc, range); + } + else if (type == Qstring) + { + string[] range = null; + if (range_list != null) + { + range = new string[nranges]; + for (int i = 0; i < nranges; i++) + range[i] = range_list[i].FirstChild.InnerText; + } + vari = domain.DefvarStr (vname, node.InnerText, desc, range); + } + else if (type == Qsymbol) + { + Symbol[] range = null; + if (range_list != null) + { + range = new Symbol[nranges]; + for (int i = 0; i < nranges; i++) + range[i] = range_list[i].FirstChild.InnerText; + } + vari = domain.DefvarSym (vname, (Symbol) node.InnerText, desc, + range); + } + else + throw new Error (Error.TermTypeInvalid, "Unknown type: {0}", type); + } + else { - i = 0; - for (int idx = 2; idx < len; idx++) + if (domain.variables.TryGetValue (vname, out vari)) + vari = vari.Clone (domain); + else + vari = new Variable (domain, vname, Zero); + domain.variables[vname] = vari; + } + return vname; + } + + private static Variable[] parse_args (Domain domain, XmlNode node, + out int min_args, out int max_args) + { + int nfixed = 0; + int noptional = 0; + int nrest = 0; + Variable[] args; + + node = node.FirstChild; + if (node != null && node.Name == Qargs) + { + XmlNode n; + for (n = node.FirstChild; n != null; n = n.NextSibling) { - c = str[idx]; - if (c < '0') - break; - else if (c <= '9') - i = i * 16 + (c - '0'); - else if (c < 'A') - break; - else if (c <= 'F') - i = i * 16 + (c - 'A'); - else if (c < 'a') - break; - else if (c <= 'f') - i = i * 16 + (c - 'a'); + if (n.Name == Qfixed) + nfixed++; + else if (n.Name == Qoptional) + noptional++; + else if (n.Name == Qrest) + { + if (nrest > 0) + throw new Error (Error.WrongType, n, "Too many "); + nrest++; + } else - break; + throw new Error (Error.WrongType, n, + "Not fixed, optional, nor rest: {0}", n.Name); } - return i; + min_args = nfixed; + max_args = nfixed + noptional + nrest; + args = new Variable[max_args]; + n = node.FirstChild; + for (int i = 0; i < max_args; n = n.NextSibling) + args[i++] = domain.Defvar ((Symbol) n.Attributes[0].Value); + if (nrest == 1) + max_args = - max_args; } - if (c == '-') - negative = true; - i = c - '0'; - for (int idx = 1; idx < len; idx++) + else { - c = str[idx]; - if (c < '0' || c > '9') - break; - i = i * 10 + (c - '0'); + min_args = max_args = 0; + args = new Variable[0]; } - return negative ? - i : i; + return args; + } + + public static Symbol parse_defun_head (Domain domain, XmlNode node) + { + Symbol name = node.Attributes[Qfname].Value; + int min_args, max_args; + Variable[] args; + + args = parse_args (domain, node, out min_args, out max_args); + if (node.Name == Qdefun) + domain.Defun (name, min_args, max_args, args, null); + else + domain.Defmacro (name, min_args, max_args, args, null); + return name; + } + + public static void parse_defun_body (Domain domain, XmlNode node) + { + bool is_defun = node.Name == Qdefun; + Symbol name = node.Attributes[Qfname].Value; + Function func = domain.GetFunc (name); + + for (node = node.FirstChild; node != null; node = node.NextSibling) + if (node.Name != Qdescription && node.Name != Qargs) + break; + Console.WriteLine ("found body " + node.Name); + + Term[] body = Parse (domain, node, null); + if (is_defun) + ((Function.Lambda) func).SetBody (body); + else + ((Function.Macro) func).SetBody (body); + } + + public static Term Parse (Domain domain, XmlNode node) + { + Symbol name = node.Name; + + try { + if (name == Qinteger) + return new Term (parse_integer (node)); + if (name == Qsymbol) + return new Term ((Symbol) node.InnerText); + if (name == Qstring) + return new Term (node.InnerText); + if (name == Qlist) + { + List list = new List (); + for (node = node.FirstChild; node != null; + node = node.NextSibling) + list.Add (Parse (domain, node)); + return new Term (list); + } + if (name == Qdefun || name == Qdefmacro) + { + name = parse_defun_head (domain, node); + parse_defun_body (domain, node); + return new Term (name); + } + if (name == Qdefvar) + { + name = parse_defvar (domain, node); + return new Term (name); + } + MethodInfo parser; + if (domain.termtypes.TryGetValue (name, out parser)) + { + object[] arg = new object[] { domain, node }; + return new Term ((TermValue) parser.Invoke (null, arg)); + } + + Funcall funcall = (Funcall) Funcall.Parser (domain, node); + if (funcall.func is Function.Macro) + return funcall.Eval (domain); + return new Term (funcall); + } catch (Error e) { + if (e.Node == null) + e.Node = node; + throw e; + } catch (Exception e) { + throw new Error (Error.UnknownError, node, e, "Parsing error"); + } } - private Term[] terms; + private static bool default_stop (XmlNode n) { return n == null; } - public Xexpression (string url, Domain domain) + public delegate bool ParseStop (XmlNode node); + + public static Term[] Parse (Domain domain, XmlNode node, ParseStop stop) { - XmlDocument doc = new XmlDocument (Name.Table); + if (stop == null) + stop = default_stop; + + XmlNode n; + for (n = node; ! stop (n); n = n.NextSibling) + if (n.NodeType == XmlNodeType.Element + && (n.Name == Qdefun || n.Name == Qdefmacro)) + { + try { + parse_defun_head (domain, n); + } catch (Error e) { + if (e.Node == null) + e.Node = node; + throw e; + } catch (Exception e) { + throw new Error (Error.UnknownError, node, e, "Parsing error"); + } + } + + List terms = new List (); + for (; node != n; node = node.NextSibling) + if (node.NodeType == XmlNodeType.Element) + { + try { + if (node.Name == Qdefun || node.Name == Qdefmacro) + parse_defun_body (domain, node); + else if (node.Name == Qdefvar) + parse_defvar (domain, node); + else + terms.Add (Parse (domain, node)); + } catch (Error e) { + if (e.Node == null) + e.Node = node; + throw e; + } catch (Exception e) { + throw new Error (Error.UnknownError, node, e, "Parsing error"); + } + } + return terms.ToArray (); + } + + public static Term[] Parse (Domain domain, string url) + { + XmlDocument doc = new XmlDocument (Symbol.NameTable); XmlNode node; - using (XmlTextReader reader = new XmlTextReader (url, Name.Table)) + using (XmlTextReader reader = new XmlTextReader (url, Symbol.NameTable)) { + reader.WhitespaceHandling = WhitespaceHandling.None; do { reader.Read (); } while (reader.NodeType != XmlNodeType.None && (reader.NodeType != XmlNodeType.Element - || reader.Name != Nexpr)); + || reader.Name != Qexpr)); if (reader.NodeType == XmlNodeType.None) throw new Exception ("Node not found"); node = doc.ReadNode (reader); } - - int nterms = 0; - for (XmlNode n = node.FirstChild; n != null; n = n.NextSibling) - if (n.NodeType == XmlNodeType.Element) - { - if (n.Name == Ndefun) - domain.RegisterFunction (n); - else if (n.Name == Ndefvar) - domain.Defvar (n); - else - nterms++; - } - - terms = new Term[nterms]; - int i = 0; - for (XmlNode n = node.FirstChild; n != null; n = n.NextSibling) - if (n.NodeType == XmlNodeType.Element) - { - if (n.Name == Ndefun) - domain.Defun (n); - else if (n.Name != Ndefvar) - terms[i++]= new Term (n, domain); - } + return Parse (domain, node.FirstChild, null); } - public Term Eval (Domain domain) + public static Term Eval (Domain domain, Term term) { - Term result = Zero; - - domain.depth = 0; - foreach (Term term in terms) - result = term.Eval (domain); - return result; + return Eval (domain, new Term[] { term }); } - public override string ToString () + public static Term Eval (Domain domain, Term[] terms) { - string str = ""; - for (int i = 0; i < terms.Length; i++) - str += terms[i]; - return str; + Term result = Zero; + + try { + foreach (Term term in terms) + { + result = term.Eval (domain); + if (domain.Thrown ()) + return result; + } + return result; + } catch (Error e) { + throw e; + } catch (Exception e) { + throw new Error (Error.UnknownError, null, e, "Runtime error"); + } } } }