using System.Collections.Generic;
using System.IO;
using System.Reflection;
+using System.Text;
+using System.Text.RegularExpressions;
using System.Xml;
namespace System.Xml
set { trace_depth = value; }
}
- public static partial class Error
+ public class Error : Exception
{
- // Load time errors.
- public static Symbol UnknownFunction = "unknown-function";
- public static Symbol TypeConflict = "type-conflict";
- public static Symbol AlreadyDefined = "already-defined";
- public static Symbol WrongCallingFormat = "wrong-calling-format";
- public static Symbol ArgumentMismatch = "argument-mismatch";
+ private readonly Symbol name;
+ private Term[] stack;
+ private XmlNode node;
- // Run time errors.
- public static Symbol ArithmeticError = "arithmetic-error";
- public static Symbol WrongType = "wrong-type";
- public static Symbol WrongRange = "wrong-range";
- public static Symbol OutOfRange = "out-of-range";
+ public Error (Symbol name, XmlNode node,
+ string fmt, params object[] args)
+ : base (String.Format (fmt, args))
+ {
+ this.name = name;
+ this.node = node;
+ }
- public static Symbol InvalidVariableType = "invalid variable type";
- public static Symbol NoOuterLoop = "no outer loop";
- public static Symbol UnknownError = "unknown error";
- }
+ 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 class Exception : System.Exception
- {
- public Symbol ErrorName;
- public string ErrorNode;
- public Term ErrorTerm;
+ public Error (Symbol name, string fmt, params object[] args)
+ : base (String.Format (fmt, args))
+ {
+ this.name = name;
+ }
- internal Exception (Symbol name, string fmt, params object[] args)
- : this (name, Zero, fmt, args) { }
+ 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; }
+ }
- internal Exception (Symbol name, XmlNode node,
- string fmt, params object[] args)
- : this (name, node, Zero, fmt, args) { }
+ public override string ToString ()
+ {
+ 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;
+ }
- internal Exception (Symbol name, Term term,
- string fmt, params object[] args)
- : this (name, null, term, fmt, args) { }
+ // 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";
- internal Exception (Symbol name, XmlNode node, Term term,
- string fmt, params object[] args)
- : base (String.Format (message, args))
- {
- ErrorName = name;
- if (node != null)
- ErrorNode = node.OuterXml;
- ErrorTerm = term;
- }
+ // 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";
- internal Exception (XmlNode node, System.Exception e)
- : base ("System error", e)
- {
- ErrorName = Qsystem_error;
- ErrorNode = node;
- ErrorTerm = Zero;
- }
+ // 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<Symbol>
private static Symbol Qename = "ename";
- public abstract class Function
- {
- 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 Function () { }
-
- public Function (Symbol name, bool with_var, int min_args, int max_args)
- {
- this.name = name;
- 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;
- }
-
- internal class Subroutine : Function
- {
- public Func<Domain, Variable, Term[], Term> builtin;
-
- public Subroutine (Func<Domain, Variable, Term[], Term> builtin,
- Symbol name, bool with_var,
- int min_args, int max_args)
- : base (name, with_var, min_args, max_args)
- {
- 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);
- }
- }
-
- internal class SpecialForm : Function
- {
- public Func<Domain, Variable, Term[], Term> builtin;
-
- public SpecialForm (Func<Domain, Variable, Term[], Term> builtin,
- Symbol name, bool with_var,
- int min_args, int max_args)
- : base (name, with_var, min_args, max_args)
- {
- this.builtin = builtin;
- }
-
- public override Term Call (Domain domain, Variable vari, Term[] args)
- {
- return builtin (domain, vari, args);
- }
- }
-
- internal class Lambda : Function
- {
- private Variable[] args;
- private Term[] body;
-
- 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 void SetBody (Term[] body)
- {
- this.body = body;
- }
-
- public override Term Call (Domain domain, Variable vari, Term[] args)
- {
- Bindings current = domain.bindings;
- Term result = Zero;
- int limit = max_args >= 0 ? args.Length : args.Length - 1;
-
- 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<Term> list = new List<Term> ();
- list.InsertRange (0, args[result].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));
- }
- domain.Catch (CatchTag.Return);
- foreach (Term term in body)
- {
- result = term.Eval (domain);
- if (domain.Thrown ())
- return result;
- }
- domain.Uncatch ();
- domain.UnboundTo (current);
- return result;
- }
- }
-
- internal class Macro : Function
- {
- private Variable[] args;
- private Term[] body;
-
- 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 void SetBody (Term[] body)
- {
- this.body = body;
- }
-
- public override Term Call (Domain domain, Variable vari, Term[] args)
- {
- Bindings current = domain.bindings;
- Term result = Zero;
-
- for (int i = 0; i < args.Length; i++)
- domain.Bind (this.args[i], args[i]);
- domain.Catch (CatchTag.Return);
- foreach (Term term in body)
- {
- result = term.Eval (domain);
- if (domain.Thrown ())
- break;
- }
- domain.Uncatch ();
- domain.UnboundTo (current);
- return result;
- }
- }
- }
-
public class Variable
{
public Domain domain;
this.val = val;
}
- public virtual bool ValueP (Term val) { return true; }
+ public Term Value { get { return val; } }
+
+ public virtual Term SetValue (Term val) { this.val = val; return val; }
public virtual Variable Clone (Domain domain)
{
public virtual void Reset () { val = Zero; }
- public Term Value
- {
- get { return val; }
- set {
- if (! ValueP (value))
- throw new Exception ("Invalid value: " + value);
- val = value;
- }
- }
-
- public Term SetValue (int i)
- {
- val.intval = i;
- val.objval = null;
- return val;
- }
-
- public Term SetValue (string s)
- {
- val.objval = s;
- return val;
- }
-
public override string ToString () { return name + "(" + val + ")"; }
public abstract class Typed : Variable
get { return desc; }
set { desc = value; }
}
+
+ 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);
}
- public class Int : Typed
+ public class IntType : Typed
{
private int[] range;
return true;
}
- public Int (Domain domain, Symbol name, int n, string desc, int[] range)
+ 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 Exception (Qinvalid_range,
- "Range length for {0} not even", name);
+ throw new Error (Error.VariableWrongRange,
+ "Range length for {0} not even", name);
this.range = range;
- if (! ValueP (val))
- throw new Exception (Qout_of_range,
- "Invalid integer value for {0}: {1}",
- name, val);
+ CheckValue (val);
}
- public override bool ValueP (Term term)
+ public override bool CheckValue (Term term)
{
- if (! term.IsInt)
- return false;
- 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;
+ 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 Int (domain, name, val.Intval, desc, range);
+ return new IntType (domain, name, val.Intval, desc, range);
}
public int[] Range { get { return range; } set { range = value; } }
}
- public class Str : Typed
+ public class StrType : Typed
{
private string[] range;
return true;
}
- public Str (Domain domain, Symbol name, string str, string desc,
- string[] range)
+ public StrType (Domain domain, Symbol name, Str str, string desc,
+ string[] range)
: base (domain, name, new Term (str), desc)
{
this.range = range;
- if (! ValueP (val))
- throw new Exception (Qout_of_range,
- "Invalid string value for {0}: {1}",
- name, val);
+ CheckValue (val);
}
- public override bool ValueP (Term term)
+ public override bool CheckValue (Term val)
{
- if (! term.IsStr)
- return false;
- if (range == null)
- return true;
- string str = term.Strval;
- foreach (string s in range)
- if (str == s)
- return true;
+ if (val.IsStr)
+ {
+ if (range == null)
+ return true;
+ Str str = val.Strval;
+ foreach (string s in range)
+ if (str.Equals (s))
+ return true;
+ }
return false;
}
public override Variable Clone (Domain domain)
{
- return new Str (domain, name, val.Strval, desc, range);
+ return new StrType (domain, name, val.Strval, desc, range);
}
public string[] Range { get { return range; } set { range = value; } }
}
- public class Sym : Typed
+ public class SymType : Typed
{
public Symbol[] range;
return true;
}
- public Sym (Domain domain, Symbol name, Symbol sym, string desc,
- Symbol[] range)
+ public SymType (Domain domain, Symbol name, Symbol sym, string desc,
+ Symbol[] range)
: base (domain, name, new Term (sym), desc)
{
this.range = range;
- if (! ValueP (val))
- throw new Exception (Qout_of_range,
- "Invalid symbol value for {0}: {1}",
- name, val);
+ CheckValue (val);
}
- public override bool ValueP (Term term)
+ public override bool CheckValue (Term val)
{
- if (! term.IsSymbol)
- return false;
- if (range == null)
- return true;
- Symbol name = term.Symval;
- foreach (Symbol n in range)
- if (name == n)
- return true;
+ 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 Sym (domain, name, val.Symval, desc, range);
+ return new SymType (domain, name, val.Symval, desc, range);
}
public Symbol[] Range { get { return range; } set { range = value; } }
}
}
+ public abstract class Function
+ {
+ 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 Function (Symbol name, bool with_var, int min_args, int max_args)
+ {
+ this.name = name;
+ 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;
+ }
+
+ internal class Subroutine : Function
+ {
+ 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)
+ {
+ 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);
+ }
+ }
+
+ internal class SpecialForm : Function
+ {
+ public Builtin builtin;
+
+ 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;
+ }
+
+ public override Term Call (Domain domain, Variable vari, Term[] args)
+ {
+ return builtin (domain, vari, args);
+ }
+ }
+
+ internal class Lambda : Function
+ {
+ private Variable[] args;
+ private Term[] body;
+
+ 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 void SetBody (Term[] body)
+ {
+ this.body = body;
+ }
+
+ public override Term Call (Domain domain, Variable vari, Term[] args)
+ {
+ Bindings current = domain.bindings;
+ Term result = Zero;
+ int limit = max_args >= 0 ? args.Length : args.Length - 1;
+
+ 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<Term> list = new List<Term> ();
+ 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 Macro : Function
+ {
+ private Variable[] args;
+ private Term[] body;
+
+ 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 void SetBody (Term[] body)
+ {
+ this.body = body;
+ }
+
+ public override Term Call (Domain domain, Variable vari, Term[] args)
+ {
+ Bindings current = domain.bindings;
+ Term result = Zero;
+
+ 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;
+ }
+ }
+ }
+
internal class Bindings
{
private Variable vari;
{
Bindings b = new Bindings (vari);
- b.vari.Value = val;
+ b.vari.SetValue (val);
b.next = bindings;
return b;
}
internal Bindings UnboundTo (Bindings boundary)
{
for (Bindings b = this; b != boundary; b = b.next)
- b.vari.Value = b.old_value;
+ b.vari.SetValue (b.old_value);
return boundary;
}
internal struct CatchTag
{
private Term tag;
+ public Term Tag { get { return tag; } }
+ // Normal symbolic catch-tag.
public CatchTag (Symbol sym) { tag = new Term (sym); }
- public CatchTag (Symbol sym, string msg) { tag = new Term (sym, msg); }
- public CatchTag (ErrorTerm e) { tag = new Term (e); }
+ // Special catch-tag for return and break.
private CatchTag (int i) { tag = new Term (i); }
- public Term Tag { get { return tag; } }
-
public static CatchTag Return = new CatchTag (0);
public static CatchTag Break = new CatchTag (1);
}
= new Dictionary<Symbol, MethodInfo> ();
internal Dictionary<Symbol, Function> functions
= new Dictionary<Symbol, Function> ();
- internal Dictionary<Symbol, Function.Macro> macros
- = new Dictionary<Symbol, Function.Macro> ();
internal Dictionary<Symbol, Variable> variables
= new Dictionary<Symbol, Variable> ();
internal Bindings bindings;
{
termtypes = new Dictionary<Symbol, MethodInfo> (parent.termtypes);
functions = new Dictionary<Symbol, Function> (parent.functions);
- macros = new Dictionary<Symbol, Function.Macro> (parent.macros);
variables = new Dictionary<Symbol, Variable> (parent.variables);
this.context = context;
}
public int CallStackCount { get { return call_stack.Count; } }
- public void CallStackPush (Term term)
- {
- call_stack.Push (term);
- }
+ public void CallStackPush (Term term) { call_stack.Push (term); }
- public void CallStackPop ()
- {
- call_stack.Pop ();
- }
+ public void CallStackPop () { call_stack.Pop (); }
public void CallStackPop (int 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);
}
}
- internal bool ThrowBreak ()
+ internal void ThrowBreak ()
{
- if (catch_stack.Peek ().Tag != CatchTag.Break.Tag)
- return false;
- catch_count--;
- return true;
- }
-
- internal void ThrowSymbol (Term tag)
- {
- foreach (CatchTag elt in catch_stack)
- {
- catch_count--;
- if (elt.Tag.Matches (tag))
- break;
- }
+ if (catch_stack.Peek ().Tag != CatchTag.Break.Tag)
+ throw new Error (Error.NoLoopToBreak,
+ "No surrounding loop to break");
+ catch_count--;
}
- internal Term ThrowError (Term tag)
+ internal void ThrowSymbol (Term tag)
{
- tag = tag.Clone ();
- ErrorTerm e = tag.objval as ErrorTerm;
- e.CallStack = call_stack.ToArray ();
-
foreach (CatchTag elt in catch_stack)
{
catch_count--;
if (elt.Tag.Matches (tag))
- break;
+ return;
}
- return tag;
+ throw new Error (Error.UncaughtThrow,
+ "No corresponding catch: {0}", tag);
}
public void DefType (Type type)
{
if (! type.IsSubclassOf (typeof (TermValue)))
- throw new Exception ("Not a subclass of TermValue: " + type);
+ 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 Exception ("No \"name\" field of string type: " + type);
+ throw new Error (Error.TermTypeInvalid,
+ "No \"name\" field of string type: {0}", type);
Symbol name = (Symbol) finfo.GetValue (null);
- if (termtypes.ContainsKey (name)
- || functions.ContainsKey (name)
- || macros.ContainsKey (name))
- throw new Exception ("already defined: " + name);
+ 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 minfo = type.GetMethod ("Parser", types);
- if (minfo == null || minfo.ReturnType != typeof (TermValue))
- throw new Exception ("No \"Parser\" method of correct type: " + type);
- termtypes[name] = minfo;
+ 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;
}
- static void check_func_head (Symbol name, bool with_var,
- int min_args, int max_args)
+ private void check_func_head (Symbol name, bool with_var,
+ int min_args, int max_args, bool as_macro)
{
if (termtypes.ContainsKey (name))
- throw new Exception (Qtype_conflict, "{0} is a Term type", name);
- else if (macros.ContainsKey (name))
- throw new Exception (Qtype_conflict, "{0} is a macro", name);
-
+ throw new Error (Error.FunctionConflict,
+ "Already defined as a term type: {0}", name);
Function func;
- if (functions.TryGetValue (name, out func)
- && (func.with_var != with_var
+ 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 Exception (Qargument_mismatch, "");
+ || func.max_args != max_args)
+ throw new Error (Error.FunctionConflict,
+ "Conflicting arguments: {0}", name);
+ }
}
- public void DefSubr (Func<Domain, Variable, Term[], Term> builtin,
- Symbol name, bool with_var,
- int min_args, int max_args)
+ public void DefSubr (Function.Builtin builtin, Symbol name,
+ bool with_var, int min_args, int max_args)
{
- check_func_head (name, with_var, min_args, max_args);
+ 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 (Func<Domain, Variable, Term[], Term> builtin,
- Symbol name, bool with_var,
- int min_args, int max_args)
+ public void DefSpecial (Function.Builtin builtin, Symbol name,
+ bool with_var, int min_args, int max_args)
{
- check_func_head (name, with_var, min_args, max_args);
+ 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 Defun (Symbol name, int min_arg, int max_arg,
+ public void Defun (Symbol name, int min_args, int max_args,
Variable[] args, Term[] body)
{
- check_func_head (name, false, min_args, max_args);
+ check_func_head (name, false, min_args, max_args, false);
functions[name] = new Function.Lambda (name, min_args, max_args,
args, body);
}
functions[func.name] = func;
}
- public void Defmacro (Symbol name, int min_arg, int max_arg,
+ public void Defmacro (Symbol name, int min_args, int max_args,
Variable[] args, Term[] body)
{
- if (termtypes.ContainsKey (name))
- throw new Exception (Qtype_conflict, "{0} is a Term type", name);
- else if (function.ContainsKey (name))
- throw new Exception (Qtype_conflict, "{0} is a function", name);
-
- Function.Macro macro;
- if (macros.TryGetValue (name, out macro)
- && (macro.min_args != min_args
- || macro.max_args != max_args))
- throw new Exception (Qargument_mismatch, "");
-
- macros[name] = new Function.Macro (name, min_arg, max_arg, args, body);
+ check_func_head (name, false, min_args, max_args, true);
+ functions[name] = new Function.Macro (name, min_args, max_args,
+ args, body);
}
public void DefAlias (Symbol alias, Symbol fname)
{
Function func;
- if (functions.TryGetValue (alias, out func))
- throw new Exception (Qalready_defined,
- "Alread defined: {0}", alias);
+ 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 Exception (Qunknown_function,
- "Unknown fucntion: {0}", fname);
+ throw new Error (Error.UnknownFunction, fname);
functions[alias] = func;
}
- public Variable Defvar (XmlNode node)
- {
- Symbol name = node.Attributes[0].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 (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 = DefvarInt (name, 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 = DefvarStr (name, 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 = DefvarSym (name, (Symbol) node.InnerText, desc, range);
- }
- else
- Exception.Throw (Qparse_error, node, "Unknown type: {0}", type);
- }
- else
- {
- if (variables.TryGetValue (name, out vari))
- vari = vari.Clone (this);
- else
- vari = new Variable (this, name, Zero);
- variables[name] = vari;
- }
- return vari;
- }
-
public Variable Defvar (Variable vari)
{
vari = vari.Clone (this);
if (variables.TryGetValue (name, out vari))
{
- Variable.Int intvari = vari as Variable.Int;
+ Variable.IntType intvari = vari as Variable.IntType;
if (intvari == null)
- throw new Exception ("Variable type mismatch: " + name);
+ throw new Error (Error.VariableTypeConflict,
+ "Not an integer variable: {0}", name);
if (range != null)
{
if (! intvari.IsSubrange (range))
- throw new Exception ("Variable range mismatch: " + name);
+ throw new Error (Error.VariableRangeConflict,
+ "Conflicting variable range: {0}", name);
intvari.Range = range;;
}
if (desc != null)
}
else
{
- vari = new Variable.Int (this, name, n, desc, range);
+ vari = new Variable.IntType (this, name, n, desc, range);
variables[name] = vari;
}
return vari;
if (variables.TryGetValue (name, out vari))
{
- Variable.Str strvari = vari as Variable.Str;
+ Variable.StrType strvari = vari as Variable.StrType;
if (strvari == null)
- throw new Exception ("Variable type mismatch: " + name);
+ throw new Error (Error.VariableTypeConflict,
+ "Not a string variable: {0}", name);
if (range != null)
{
if (! strvari.IsSubrange (range))
- throw new Exception ("Variable range mismatch: " + name);
+ throw new Error (Error.VariableRangeConflict,
+ "Conflicting variable range: {0}", name);
strvari.Range = range;
}
if (desc != null)
}
else
{
- vari = new Variable.Str (this, name, str, desc, range);
+ vari = new Variable.StrType (this, name, new Str (str), desc,
+ range);
variables[name] = vari;
}
return vari;
if (variables.TryGetValue (name, out vari))
{
- Variable.Sym symvari = vari as Variable.Sym;
+ Variable.SymType symvari = vari as Variable.SymType;
if (symvari == null)
- throw new Exception ("Variable type mismatch: " + name);
+ throw new Error (Error.VariableTypeConflict,
+ "Not a symbol variable: {0}", name);
if (range != null)
{
if (! symvari.IsSubrange (range))
- throw new Exception ("Variable range mismatch: " + name);
+ throw new Error (Error.VariableRangeConflict,
+ "Conflicting variable range: {0}", name);
symvari.Range = range;
}
if (desc != null)
}
else
{
- vari = new Variable.Sym (this, name, sym, desc, range);
+ vari = new Variable.SymType (this, name, sym, desc, range);
variables[name] = vari;
}
return vari;
internal Function GetFunc (Symbol name)
{
Function func;
-
if (! functions.TryGetValue (name, out func))
- throw new Exception (Qunknown_function, (strign) name);
+ throw new Error (Error.UnknownFunction,
+ "Unknown function: {0}", name);
return func;
}
domain.functions[kv.Key] = kv.Value;
}
- public Variable GetVar (Symbol name, bool create)
+ public Variable GetVar (Symbol name)
{
Variable vari;
if (! variables.TryGetValue (name, out vari))
- {
- if (! create)
- return null;
- variables[name] = vari = new Variable (this, name, Zero);
- }
+ variables[name] = vari = new Variable (this, name, Zero);
return vari;
}
{
foreach (KeyValuePair<Variable,Term> kv
in (Dictionary<Variable,Term>) values)
- kv.Key.Value = kv.Value;
+ kv.Key.SetValue (kv.Value);
}
}
private static Term Fset (Domain domain, Variable vari, Term[] args)
{
if (vari == null)
- return new Term (new ErrorTerm (Error.NoVariable, ""));
- vari.Value = args[0];
+ throw new Error (Error.NoVariableName, "No variable name to set");
+ vari.SetValue (args[0]);
return args[0];
}
return args[0].IsTrue ? Zero : One;
}
+ 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.Value.Intval;
foreach (Term arg in args)
n += arg.Intval;
- return (vari == null ? new Term (n) : vari.SetValue (n));
+ return maybe_set_intvar (vari, n);
}
private static Term Fmul (Domain domain, Variable vari, Term[] args)
int n = vari == null ? 1 : vari.Value.Intval;
foreach (Term arg in args)
n *= arg.Intval;
- return (vari == null ? new Term (n) : vari.SetValue (n));
+ return maybe_set_intvar (vari, n);
}
private static Term Fsub (Domain domain, Variable vari, Term[] args)
}
while (i < args.Length)
n -= args[i++].Intval;
- return (vari == null ? new Term (n) : vari.SetValue (n));
+ return maybe_set_intvar (vari, n);
}
private static Term Fdiv (Domain domain, Variable vari, Term[] args)
}
while (i < args.Length)
n /= args[i++].Intval;
- return (vari == null ? new Term (n) : vari.SetValue (n));
+ return maybe_set_intvar (vari, n);
}
private static Term Fmod (Domain domain, Variable vari, Term[] args)
{
- int n = args[0].Intval % args[1].Intval;
-
- return (vari == null ? new Term (n) : vari.SetValue (n));
+ return maybe_set_intvar (vari, args[0].Intval % args[1].Intval);
}
private static Term Flogior (Domain domain, Variable vari, Term[] args)
int n = vari == null ? 0 : vari.Value.Intval;
foreach (Term arg in args)
n |= arg.Intval;
- return (vari == null ? new Term (n) : vari.SetValue (n));
+ return maybe_set_intvar (vari, n);
}
private static Term Flogand (Domain domain, Variable vari, Term[] args)
}
while (i < args.Length)
n &= args[i++].Intval;
- return (vari == null ? new Term (n) : vari.SetValue (n));
+ return maybe_set_intvar (vari, n);
}
private static Term Flsh (Domain domain, Variable vari, Term[] args)
{
- int n = args[0].Intval << args[1].Intval;
- return (vari == null ? new Term (n) : vari.SetValue (n));
+ return maybe_set_intvar (vari, args[0].Intval << args[1].Intval);
}
private static Term Frsh (Domain domain, Variable vari, Term[] args)
{
- int n = args[0].Intval >> args[1].Intval;
- return (vari == null ? new Term (n) : vari.SetValue (n));
+ return maybe_set_intvar (vari, args[0].Intval >> args[1].Intval);
}
private static Term Feq (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.Value.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<Term>) 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 term;
- term.intval = 0;
- term.objval = str;
- return term;
+ str.Insert (-1, (char) arg.Intval);
}
- return vari.SetValue (str);
+ return vari == null ? new Term (str) : vari.Value;
}
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<Term>) args[1].objval)[args[0].Intval];
- }
- else
- throw new Exception (Qwrong_type,
- "{0} is not a string nor a list", 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 Fcopy (Domain domain, Variable vari, Term[] args)
{
- Term result;
-
- result.intval = 0;
- result.objval = new List<Term> (args[0].Listval);
- return result;
+ return args[0].Clone ();
}
private static Term Fins (Domain domain, Variable vari, Term[] args)
{
if (vari == null)
- throw new Exception (Qwrong_calling_format, "No vname attribute");
- Term term = vari.Value;
- if (term.IsStr)
- {
- string str = term.Strval.Insert (args[0].Intval, args[1].Strval);
- vari.SetValue (str);
- }
+ 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 (Qwrong_type, "{0} is not a string nor list",
- vari.Value);
+ throw new Error (Error.WrongType, "Not a string nor a list: {0}",
+ vari.Value);
return vari.Value;
}
private static Term Fdel (Domain domain, Variable vari, Term[] args)
{
if (vari == null)
- throw new Exception (Qwrong_calling_format, "No vname attribute");
+ throw new Error (Error.NoVariableName, "No variable name to set");
if (vari.Value.IsStr)
- {
- string str
- = vari.Value.Strval.Remove (args[0].Intval,
- args[1].Intval - args[0].Intval);
- vari.SetValue (str);
- }
+ 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);
+ args[1].Intval - args[0].Intval);
else
- throw new Exception (Qwrong_type, "{0} is not a string nor a list",
- vari.Value);
+ throw new Error (Error.WrongType, "Not a string nor a list: {0}",
+ vari.Value);
return vari.Value;
}
private static Term Fbreak (Domain domain, Variable vari, Term[] args)
{
- if (! domain.ThrowBreak ())
- return domain.ThrowError (new Term (Error.NoOuterLoop, null));
+ domain.ThrowBreak ();
return args.Length == 0 ? Zero : args[0];
}
Term result= Zero;
caught = false;
- for (int i = idx; i < args.Length; i++)
+ for (int i = idx; i < terms.Length; i++)
{
- result = args[i].Eval (domain);
+ result = terms[i].Eval (domain);
if (domain.Thrown (out caught))
break;
}
bool caught = false;
if (args.Length < 2)
- throw new Exception (Error.WrongCallingFormat,
- "too fee arguments: {0}", args.Length);
- if (args[0].IsError)
+ throw new Error (Error.WrongArgument,
+ "Too few arguments: {0}", args.Length);
+ ErrorTerm err = args[0].objval as ErrorTerm;
+ if (err != null)
{
- int count = domain.CallStackCount;
-
try {
- result = evaluate_terms (domain, args, 1, out caught);
- } catch (Exception e) {
- if (! args[0].Matches (e.ErrorTerm))
- throw e;
- ((ErrorTerm) e.ErrorTerm.objval).
+ result = eval_terms (domain, args, 1, out caught);
+ } catch (System.Exception exception) {
+ Term term;
+
+ 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.Value = e.ErrorTerm;
- domain.CallStackPop (count);
+ vari.SetValue (term);
return One;
}
}
else if (args[0].IsSymbol)
{
- domain.Catch (new CatchTag (args[0].Symval));
- result = evaluate_terms (domain, args, 1, out caught);
- domain.Uncatch ();
+ 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 ();
+ }
}
- if (vari != null)
- vari.Value = result;
- return Zero;
+ throw new Error (Error.WrongArgument,
+ "Not a symbol nor an error: {0}", args[0]);
}
public static Term Fthrow (Domain domain, Variable vari, Term[] args)
return (args[args.Length - 1]);
}
if (args[0].IsError)
- return domain.ThrowError (args[0]);
- return domain.ThrowError (new Term (Error.InvalidArgumentType,
- args[0].ToString ()));
+ {
+ 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]);
}
public abstract class TermValue
{
- public virtual Term Eval (Domain domain) { return this; }
+ 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 Term Eval (Domain domain)
{
if (vari == null || vari.domain != domain)
- vari = domain.GetVar (vname, true);
+ vari = domain.GetVar (vname);
return vari.Value;
}
if (nargs < func.min_args
|| (func.max_args >= 0 && nargs > func.max_args))
- throw new Exception (Qwrong_calling_format,
- "Wrong number of arguments to {0}: {1}",
- func.name, nargs);
+ throw new Error (Error.WrongArgument,
+ "Wrong number of arguments to {0}: {1}",
+ func.name, nargs);
if (! func.with_var && vari != null)
- throw new Exception (Qwrong_calling_format,
- "Wrong vname attribute to {0}: {1}",
- func.name, vari.name);
+ throw new Error (Error.WrongArgument,
+ "Wrong vname attribute to {0}: {1}",
+ func.name, vari.name);
this.func = func;
this.vari = vari;
this.args = args;
Function func = domain.GetFunc (fname);
Variable vari;
attr = node.Attributes[Qvname];
- vari = attr == null ? null : domain.GetVar (attr.Value, true);
+ vari = attr == null ? null : domain.GetVar (attr.Value);
XmlNodeList nlist = node.ChildNodes;
int nargs = nlist.Count;
Term[] args = new Term[nargs];
for (int i = 0; i < nargs; i++)
- args[i] = new Term (domain, nlist[i]);
+ args[i] = Parse (domain, nlist[i]);
return new Funcall (func, vari, args);
}
public override Term Eval (Domain domain)
{
+ Term result;
domain.TraceWrite (ToString ());
- domain.depth++;
- Term result = func.Call (domain, vari, args);
- domain.depth--;
+ try {
+ domain.depth++;
+ result = func.Call (domain, vari, args);
+ } finally {
+ domain.depth--;
+ }
domain.TraceWrite ("=> {0}", result.ToString ());
return result;
}
{
string str = "<" + func.name;
if (vari != null)
- str += " vname=\"" + vari.name + "\"";
+ {
+ str += " vname=\"" + vari.name + "\"";
+ if (detail)
+ str += " val=" + vari.Value.ToString ();
+ }
if (args.Length == 0 || ! detail)
return str + "/>";
str += ">";
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)
return new ErrorTerm (ename, message);
}
- public Term[] CallStack { get { return stack; } set { stack = value; } }
+ public Term[] CallStack {
+ get { return stack; }
+ internal set { stack = value; }
+ }
public override TermValue Clone ()
{
public override bool Equals (object obj)
{
ErrorTerm e = obj as ErrorTerm;
- if (e == null || e.ename != ename || e.message != message
- || (e.stack == null ? stack != null
- : (stack == null || e.stack.Length != stack.Length)))
- return false;
- if (stack != null)
- for (int i = 0; i < stack.Length; i++)
- if (! stack[i].Equals (e.stack[i]))
- return false;
- return true;
+ 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 ()
}
}
+ 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;
// <symbol>...</symbol>
public Term (Symbol name) { intval = 0; objval = name; }
// <string>...</string>
- public Term (string str) { intval = 0; objval = str; }
+ public Term (string str) { intval = 0; objval = new Str (str); }
// <list>...</list>
public Term (List<Term> list) { intval = 0; objval = list; }
// <error ename="ERROR-NAME">ERROR-MESSASGE</error>
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, XmlNode node)
- {
- Symbol name = node.Name;
-
- if (name == Qinteger)
- {
- intval = parse_integer (node);
- objval = null;
- }
- else
- {
- intval = 0;
- if (name == Qsymbol)
- objval = (Symbol) node.InnerText;
- else if (name == Qstring)
- objval = node.InnerText.Clone ();
- else if (name == Qlist)
- {
- List<Term> list = new List<Term> ();
- for (node = node.FirstChild; node != null;
- node = node.NextSibling)
- list.Add (new Term (domain, node));
- objval = list;
- }
- else
- {
- MethodInfo minfo;
-
- if (domain.termtypes.TryGetValue (name, out minfo))
- objval = (TermValue) minfo.Invoke (null, new Object[] { domain, node});
- else
- {
- Funcall funcall = (Funcall) Funcall.Parser (domain, node);
- if (funcall.func is Function.Macro)
- {
- Term result = funcall.Eval (domain);
- intval = result.intval;
- objval = result.objval;
- }
- else
- objval = funcall;
- }
- }
- }
- }
-
// <varref vname="VNAME"/>
public Term (Domain domain, Symbol vname)
{
intval = 0;
Function func = domain.GetFunc (fname);
- Variable vari = vname == Qnull ? null : domain.GetVar (vname, true);
+ Variable vari = vname == Qnull ? null : domain.GetVar (vname);
Funcall funcall = new Funcall (func, vari, args);
if (func is Function.Macro)
{
public object Objval {
get {
if (objval == null)
- throw new Exception (Qwrong_type,
- "term is an integer: {0}", this);
+ throw new Error (Error.WrongType,
+ "term is an integer: {0}", this);
return objval;
}
}
public int Intval {
get {
if (objval != null)
- throw new Exception (Qwrong_type, "{0} is not an 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 (Qwrong_type, "{0} is not a 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 Exception (Qwrong_type, "{0} is not a symbol", this);
+ throw new Error (Error.WrongType, "{0} is not a symbol", this);
return (Symbol) objval;
}
}
public List<Term> Listval {
get {
if (! IsList)
- throw new Exception (Qwrong_type, "{0} is not a list");
+ throw new Error (Error.WrongType, "{0} is not a list");
return (List<Term>) objval;
}
}
}
public bool IsInt { get { return (objval == null); } }
- public bool IsStr { get { return (objval is string); } }
+ public bool IsStr { get { return (objval is Str); } }
public bool IsSymbol { get { return (objval is Symbol); } }
public bool IsList { get { return (objval is List<Term>); } }
public bool IsError { get { return (objval is ErrorTerm); } }
- private Term Eval (Domain domain)
+ internal Term Eval (Domain domain)
{
- if (objval == null || objval is Symbol || objval is string
+ if (objval == null || objval is Symbol || objval is Str
|| objval is List<Term>)
return this;
- domain.CallStackPush (this);
- Term result = ((TermValue) objval).Eval (domain);
- domain.CallStackPop ();
- return result;
+ 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 Term Clone ()
{
- if (objval == null || objval is Symbol || objval is string)
+ if (objval == null || objval is Symbol)
return this;
+ if (objval is Str)
+ return new Term (((Str) objval).ToString ());
if (objval is List<Term>)
{
List<Term> list = new List<Term> ();
Term term = (Term) obj;
if (IsInt)
return term.IsInt && term.Intval == Intval;
- if (IsStr)
- return term.IsStr && term.Strval == Strval;
if (IsSymbol)
return term.IsSymbol && term.Symval == Symval;
+ if (IsStr)
+ return (term.IsStr && term.Strval.Equals (Strval));
if (IsList)
{
if (! term.IsList)
public bool Matches (Term term)
{
if (IsInt)
- return term.IsInt && term.Intval == Intval;
- if (IsStr)
- return term.IsStr && term.Strval == Strval;
+ return term.IsInt && Intval == term.Intval;
if (IsSymbol)
- return term.IsSymbol && term.Symval == Symval;
+ return term.IsSymbol && Symval == term.Symval;
+ if (IsStr)
+ return term.IsStr && Strval.Matches (term.Strval);
if (IsList)
{
if (! term.IsList)
str = "<integer>" + intval + "</integer>";
else if (objval is Symbol)
str = "<symbol>" + objval + "</symbol>";
- else if (objval is string)
+ else if (objval is Str)
str = "<string>" + objval + "</string>";
else if (objval is List<Term>)
{
private static int parse_integer (XmlNode node)
{
- str = node.InnerText;
+ string str = node.InnerText;
int len = str.Length;
- bool negative = false;
int i, c;
- if (len == 1 && str[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), NumberStyles.HexNumber, null,
+ if (! int.TryParse (str.Substring (2),
+ Globalization.NumberStyles.HexNumber, null,
out i))
- Exception.Throw (Qparse_error, node, "Invalid integer");
+ throw new Error (Error.InvalidInteger, node,
+ "Not a integer string: {0}", str);
return i;
}
if (! int.TryParse (str, out i))
- Exception.Throw (Qparse_error, node, "Invalid integer");
+ throw new Error (Error.InvalidInteger, node,
+ "Not a integer string: {0}", str);
return i;
}
- static bool parse_error (XmlNode node, out Term term)
+ private static Symbol parse_defvar (Domain domain, XmlNode node)
{
- try {
- term = new Term (node.OuterXml);
- } catch {
- term = memory_error;
- }
- return false;
- }
+ 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;
- static bool parse_error (XmlNode node, out Term[] terms)
- {
- try {
- terms = new Term[] { new Term (node.OuterXml) };
- } catch {
- terms = new Term[] { memory_error };
- }
- return false;
+ 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 (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
+ {
+ 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,
for (n = node.FirstChild; n != null; n = n.NextSibling)
{
if (n.Name == Qfixed)
- nfixed += n.ChildNodes.Count;
+ nfixed++;
else if (n.Name == Qoptional)
- noptional += n.ChildNodes.Count;
+ noptional++;
else if (n.Name == Qrest)
- nrest++;
+ {
+ if (nrest > 0)
+ throw new Error (Error.WrongType, n, "Too many <rest>");
+ nrest++;
+ }
else
- throw new Exception (Qinvalid_argument_type, n);
+ throw new Error (Error.WrongType, n,
+ "Not fixed, optional, nor rest: {0}", n.Name);
}
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)
- {
- for (XmlNode nn = n.FirstChild; nn != null; nn = nn.NextSibling)
- args[i++] = domain.Defvar ((Symbol) nn.Attributes[0].Value);
- }
+ args[i++] = domain.Defvar ((Symbol) n.Attributes[0].Value);
if (nrest == 1)
max_args = - max_args;
}
int min_args, max_args;
Variable[] args;
- try {
- args = parse_head (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);
- } catch (Exception e) {
- if (e.ErrorNode == null)
- e.ErrorNode = node;
- throw e;
- } catch (System.Exception e) {
- throw new Exception (node, e);
- }
+ 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)
+ if (node.Name != Qdescription && node.Name != Qargs)
break;
+ Console.WriteLine ("found body " + node.Name);
+
Term[] body = Parse (domain, node, null);
- if (node.Name == Qdefun)
+ if (is_defun)
((Function.Lambda) func).SetBody (body);
else
((Function.Macro) func).SetBody (body);
{
Symbol name = node.Name;
- 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<Term> list = new List<Term> ();
- 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 minfo;
- if (domain.termtypes.TryGetValue (name, out minfo))
- {
- object[] arg = new object[] { domain, node };
- return new Term ((TermValue) minfo.Invoke (null, arg));
- }
+ 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<Term> list = new List<Term> ();
+ 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);
+ 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 static bool default_stop (XmlNode n) { return n == null; }
- public static List<Term> Parse (Domain domain, XmlNode node,
- Func<XmlNode, bool> stop)
+ public delegate bool ParseStop (XmlNode node);
+
+ public static Term[] Parse (Domain domain, XmlNode node, ParseStop stop)
{
if (stop == null)
stop = default_stop;
for (n = node; ! stop (n); n = n.NextSibling)
if (n.NodeType == XmlNodeType.Element
&& (n.Name == Qdefun || n.Name == Qdefmacro))
- parse_defun_head (domain, n);
+ {
+ 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<Term> terms = new List<Term> ();
for (; node != n; node = node.NextSibling)
if (node.NodeType == XmlNodeType.Element)
{
- 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));
+ 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;
+ return terms.ToArray ();
}
- public static List<Term> Parse (Domain domain, string url)
+ public static Term[] Parse (Domain domain, string url)
{
XmlDocument doc = new XmlDocument (Symbol.NameTable);
XmlNode node;
- using (XmlTextReader reader = new XmlTextReader (url, doc.NameTable))
+ using (XmlTextReader reader = new XmlTextReader (url, Symbol.NameTable))
{
+ reader.WhitespaceHandling = WhitespaceHandling.None;
do {
reader.Read ();
} while (reader.NodeType != XmlNodeType.None
return Parse (domain, node.FirstChild, null);
}
- public static Term Eval (Domain domain, List<Term> terms)
+ public static Term Eval (Domain domain, Term[] terms)
{
Term result = Zero;
- foreach (Term term in terms)
- {
- result = term.Eval (domain);
- if (domain.Thrown)
- return result;
- }
- return result;
+ 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");
+ }
}
}
}