+++ /dev/null
-using System;
-using System.Collections;
-using System.Collections.Generic;
-using System.IO;
-using System.Xml;
-
-using M17N;
-using M17N.Core;
-
-namespace M17N.Core
-{
- public class MExpression
- {
- private static MSymbol Mvarref = "symbol-value";
- private static MSymbol Mdefun = "defun";
- private static MSymbol Mcond = "cond";
- private static MSymbol Mprogn = "progn";
- private static MSymbol Mwhen = "when";
-
- public class Domain
- {
- private Domain parent;
- internal MPlist functions = new MPlist ();
- internal MPlist bindings = new MPlist ();
- private Stack<MPlist> boundaries = new Stack<MPlist> ();
- internal Translator translator;
- public object context;
-
- internal Domain ()
- {
- boundaries.Push (bindings);
- }
-
- public Domain (object context) : this (basic, context) { }
-
- public Domain (Domain parent, object context)
- {
- this.parent = parent;
- this.context = context;
- boundaries.Push (bindings);
- }
-
- public void AddTranslator (Translator translator)
- {
- if (this.translator == null)
- this.translator = translator;
- else
- this.translator += translator;
- }
-
- public void Bind (MSymbol sym, object value)
- {
- bindings = bindings.Cons (sym, value);
- }
-
- public MPlist SetBoundary ()
- {
- boundaries.Push (bindings);
- return bindings;
- }
-
- public void UnboundTo (MPlist boundary)
- {
- while (boundary != boundaries.Pop ());
- while (bindings != boundary)
- bindings = bindings.next;
- }
-
- public void Defun (string name, Builtin builtin, int min_arg, int max_arg)
- {
- Defun (name, builtin, min_arg, max_arg, false);
- }
-
- public void Defun (string name, Builtin builtin, int min_arg, int max_arg,
- bool specialp)
- {
- MSymbol sym = name;
- Function func = (Function) functions.Get (sym);
-
- if (func != null)
- {
- if (func.min_arg < min_arg || func.max_arg > max_arg)
- throw new Exception ("Incompatible argument numbers to override: "
- + name);
- func.builtin = builtin;
- func.lambda = null;
- func.min_arg = min_arg;
- func.max_arg = max_arg;
- func.specialp = specialp;
- }
- else
- {
- func = new Function (sym, builtin, min_arg, max_arg, specialp);
- functions = functions.Cons (sym, func);
- }
- }
-
- public void Defun (MSymbol sym, MPlist args, MPlist body)
- {
- Function func = (Function) functions.Get (sym);
-
- if (func != null)
- {
- int nargs = args == null ? 0 : args.Count;
-
- if (func.min_arg < nargs || func.max_arg > nargs)
- throw new Exception ("Incompatible argument numbers to override: "
- + sym);
- func.lambda.SetArgs (args);
- func.lambda.SetBody (body, this);
- func.builtin = null;
- }
- else
- {
- func = new Function (sym, args, body, this);
- functions = functions.Cons (sym, func);
- }
- }
-
- public void Defun (XmlNode node)
- {
- MSymbol sym = node.Attributes["id"].Value;
- Function func = (Function) functions.Get (sym);
-
- if (func != null)
- {
- XmlNode args = node.FirstChild;
- int nargs = args.Name == "args" ? args.ChildNodes.Count : 0;
-
- if (func.min_arg < nargs || func.max_arg > nargs)
- throw new Exception ("Incompatible argument numbers to override: "
- + sym);
- func.lambda.Set (node, this);
- func.builtin = null;
- }
- else
- {
- func = new Function (sym, node, this);
- functions = functions.Cons (sym, func);
- }
- }
-
- internal Function GetFunc (MSymbol name)
- {
- Function func = (Function) functions.Get (name);
-
- if (func == null)
- {
- if (parent != null)
- return parent.GetFunc (name);
- throw new Exception ("Unknown function: " + name);
- }
- return func;
- }
-
- public bool CopyFunc (Domain domain, MSymbol name)
- {
- Function func = (Function) functions.Get (name);
- if (func == null)
- return false;
- domain.functions = domain.functions.Cons (name, func);
- return true;
- }
-
- public void CopyFunc (Domain domain)
- {
- foreach (MPlist p in functions)
- domain.functions = domain.functions.Cons (p.key, p.val);
- }
-
- public object GetValue (MSymbol name)
- {
- MPlist slot = bindings.Find (name);
-
- if (slot == null)
- {
- if (parent != null)
- return parent.GetValue (name);
- throw new Exception ("Unbound variable: " + name);
- }
- return slot.val;
- }
-
- public object SetValue (MSymbol name, object val)
- {
- MPlist boundary = boundaries.Peek ();
-
- for (MPlist plist = bindings; plist != boundary; plist = plist.next)
- if (plist.key == name)
- {
- plist.val = val;
- return val;
- }
- bindings = bindings.Cons (name, val);
- return val;
- }
-
- public bool IsBound (MSymbol name)
- {
- return (bindings.Find (name) != null);
- }
-
- public void Translate (MPlist plist)
- {
- if (parent != null)
- parent.Translate (plist);
- if (translator != null)
- for (MPlist p = plist; ! p.IsEmpty; p = p.next)
- translator (p, this);
- }
-
- public override string ToString ()
- {
- string str = "<(functions";
- foreach (MPlist p in functions)
- str += " " + p.key;
- str += ") (bindings " + bindings + ")";
- if (context != null)
- str += " (" + context + ")";
- str += ">";
- return str;
- }
- }
-
- public delegate object Builtin (MExpression[] args, Domain domain);
- public delegate void Translator (MPlist plist, Domain domain);
-
- internal class Function
- {
- internal class Lambda
- {
- internal MSymbol[] args;
- internal MExpression[] body;
-
- public Lambda (MPlist args, MPlist body, Domain domain)
- {
- SetArgs (args);
- SetBody (body, domain);
- }
-
- public Lambda (XmlNode node, Domain domain)
- {
- Set (node, domain);
- }
-
- public void SetArgs (MPlist args)
- {
- int len = args == null ? 0 : args.Count;
-
- if (this.args == null)
- this.args = new MSymbol[len];
- for (int i = 0; i < len; i++, args = args.next)
- this.args[i] = args.Symbol;
- }
-
- public void SetBody (MPlist body, Domain domain)
- {
- int len = body == null ? 0 : body.Count;
- if (this.body == null)
- this.body = new MExpression[len];
- for (int i = 0; i < len; i++, body = body.next)
- {
- domain.Translate (body);
- this.body[i] = new MExpression (body.key, body.val, domain);
- }
- }
-
- public void Set (XmlNode node, Domain domain)
- {
- XmlNodeList body = node.ChildNodes;
- int idx = 0;
-
- if (body[0].Name == "args")
- {
- XmlNodeList args = body[0].ChildNodes;
- if (this.args == null)
- this.args = new MSymbol[args.Count];
- for (int i = 0; i < args.Count; i++)
- this.args[i] = args[i].InnerText;
- idx++;
- }
- else if (this.args == null)
- this.args = new MSymbol[0];
- if (this.body == null)
- this.body = new MExpression[body.Count - idx];
- for (int i = 0; idx < body.Count; i++, idx++)
- this.body[i] = new MExpression (body[idx], domain);
- }
- }
-
- public readonly MSymbol Name;
- public Builtin builtin;
- public int min_arg, max_arg;
- internal Lambda lambda;
- public bool specialp = false;
-
- internal static Function ignore, varref, block;
-
- public Function (MSymbol name, Builtin builtin,
- int min_arg, int max_arg, bool specialp)
- {
- Name = name;
- this.builtin = builtin;
- this.min_arg = min_arg;
- this.max_arg = max_arg;
- this.specialp = specialp;
- }
-
- internal Function (MSymbol name, MPlist args, MPlist body,
- Domain domain)
- {
- Name = name;
- lambda = new Lambda (args, body, domain);
- this.min_arg = this.max_arg = lambda.args.Length;
- }
-
- internal Function (MSymbol name, XmlNode node, Domain domain)
- {
- Name = name;
- lambda = new Lambda (node, domain);
- this.min_arg = this.max_arg = lambda.args.Length;
- }
-
- private Function ()
- {
- Name = MSymbol.nil;
- }
-
- static Function ()
- {
- ignore = new Function ();
- varref = new Function (Mvarref, get_value, 1, 1, true);
- block = new Function (Mprogn, progn, 0, -1, true);
- }
-
- private static object get_value (MExpression[] args, Domain domain)
- {
- return domain.GetValue ((MSymbol) args[0].val);
- }
-
- public object Call (MExpression[] args, Domain domain)
- {
- if (builtin != null)
- {
- if (! specialp)
- foreach (MExpression e in args)
- e.Eval (domain);
- return builtin (args, domain);
- }
- if (lambda == null)
- return null;
- MPlist orig_bindings = domain.bindings;
- object result = false;
- try {
- int i = 0;
- foreach (MSymbol arg in lambda.args)
- domain.Bind (arg, args[i++].Eval (domain));
- foreach (MExpression e in lambda.body)
- result = e.Eval (domain);
- } finally {
- domain.bindings = orig_bindings;
- }
- return result;
- }
- }
-
- private static Domain basic;
-
- static MExpression ()
- {
- basic = new Domain ();
-
- basic.Defun ("set", set_value, 2, 2, true);
- basic.Defun ("=", set_value, 2, 2, true);
- basic.Defun ("!", not, 1, 1, false);
- basic.Defun ("+", plus, 2, -1, false);
- basic.Defun ("*", multi, 2, -1, false);
- basic.Defun ("-", minus, 1, -1, false);
- basic.Defun ("/", divide, 2, -1, false);
- basic.Defun ("%", percent, 2, -1, false);
- basic.Defun ("|", logior, 2, -1, false);
- basic.Defun ("&", logand, 2, -1, false);
- basic.Defun ("+=", pluseq, 2, -1, true);
- basic.Defun ("*=", multieq, 2, -1, true);
- basic.Defun ("-=", minuseq, 2, -1, true);
- basic.Defun ("/=", divideeq, 2, -1, true);
- basic.Defun ("%=", percenteq, 2, -1, true);
- basic.Defun ("|=", logioreq, 2, -1, true);
- basic.Defun ("&=", logandeq, 2, -1, true);
- basic.Defun ("<<", lshift, 2, 2, false);
- basic.Defun (">>", rshift, 2, 2, false);
- basic.Defun ("<<=", lshifteq, 2, 2, true);
- basic.Defun (">>=", rshifteq, 2, 2, true);
- basic.Defun ("==", eq, 2, -1, false);
- basic.Defun ("!=", noteq, 2, 2, false);
- basic.Defun ("<", less, 2, -1, false);
- basic.Defun ("<=", lesseq, 2, -1, false);
- basic.Defun (">", more, 2, -1, false);
- basic.Defun (">=", moreeq, 2, -1, false);
- basic.Defun ("progn", progn, 0, -1, true);
- basic.Defun ("if", ifclause, 2, -1, true);
- basic.Defun ("when", whenclause, 1, -1, true);
- basic.Defun ("while", whileclause, 1, -1, true);
-
- basic.AddTranslator (new Translator (translate_cond));
- }
-
- private static object set_value (MExpression[] args, Domain domain)
- {
- return domain.SetValue ((MSymbol) args[0].args[0].val,
- args[1].Eval (domain));
- }
-
- private static object not (MExpression[] args, Domain domain)
- {
- if (args[0].val is int)
- return (int) args[0].val == 0;
- if (args[0].val is bool)
- return ! ((bool) args[0].val);
- return true;
- }
-
- private static object plus (MExpression[] args, Domain domain)
- {
- if (args[0].val is int)
- {
- int n = 0;
- foreach (MExpression e in args)
- n += (int) e.val;
- return n;
- }
- else if (args[0].val is MText)
- {
- MText mt = new MText ();
- foreach (MExpression e in args)
- mt += (MText) e.val;
- return mt;
- }
- throw new Exception ("Not an integer nor MText: " + args[0].val);
- }
-
- private static object multi (MExpression[] args, Domain domain)
- {
- int n = 1;
- foreach (MExpression e in args)
- n *= (int) e.val;
- return n;
- }
-
- private static object minus (MExpression[] args, Domain domain)
- {
- int n = (int) args[0].val;
- if (args.Length == 1)
- return - n;
- for (int i = 1; i < args.Length; i++)
- n -= (int) args[i].val;
- return n;
- }
-
- private static object divide (MExpression[] args, Domain domain)
- {
- int n = (int) args[0].val;
- for (int i = 1; i < args.Length; i++)
- n /= (int) args[i].val;
- return n;
- }
-
- private static object percent (MExpression[] args, Domain domain)
- {
- int n = (int) args[0].val;
- for (int i = 1; i < args.Length; i++)
- n %= (int) args[i].val;
- return n;
- }
-
- private static object logior (MExpression[] args, Domain domain)
- {
- int n = 0;
- foreach (MExpression e in args)
- n |= (int) e.val;
- return n;
- }
-
- private static object logand (MExpression[] args, Domain domain)
- {
- int n = 0;
- foreach (MExpression e in args)
- n &= (int) e.val;
- return n;
- }
-
- private static object pluseq (MExpression[] args, Domain domain)
- {
- MSymbol sym = (MSymbol) args[0].args[0].val;
- object val = domain.GetValue (sym);
-
- if (val is int)
- {
- int n = (int) val;
- for (int i = 1; i < args.Length; i++)
- n += (int) args[i].Eval (domain);
- val = n;
- }
- else if (val is MText)
- {
- MText mt = (MText) val;
- for (int i = 1; i < args.Length; i++)
- mt.Cat ((MText) args[i].Eval (domain));
- val = mt;
- }
- domain.SetValue (sym, val);
- return val;
- }
-
- private static object multieq (MExpression[] args, Domain domain)
- {
- MSymbol sym = (MSymbol) args[0].args[0].val;
- int n = (int) domain.GetValue (sym);
-
- for (int i = 1; i < args.Length; i++)
- n *= (int) args[i].Eval (domain);
- return domain.SetValue (sym, (object) n);
- }
-
- private static object minuseq (MExpression[] args, Domain domain)
- {
- MSymbol sym = (MSymbol) args[0].args[0].val;
- int n = (int) domain.GetValue (sym);
-
- for (int i = 1; i < args.Length; i++)
- n -= (int) args[i].Eval (domain);
- return domain.SetValue (sym, (object) n);
- }
-
- private static object divideeq (MExpression[] args, Domain domain)
- {
- MSymbol sym = (MSymbol) args[0].args[0].val;
- int n = (int) domain.GetValue (sym);
-
- for (int i = 1; i < args.Length; i++)
- n /= (int) args[i].Eval (domain);
- return domain.SetValue (sym, (object) n);
- }
-
- private static object percenteq (MExpression[] args, Domain domain)
- {
- MSymbol sym = (MSymbol) args[0].args[0].val;
- int n = (int) domain.GetValue (sym);
-
- for (int i = 1; i < args.Length; i++)
- n %= (int) args[i].Eval (domain);
- return domain.SetValue (sym, (object) n);
- }
-
- private static object logioreq (MExpression[] args, Domain domain)
- {
- MSymbol sym = (MSymbol) args[0].args[0].val;
- int n = (int) domain.GetValue (sym);
-
- for (int i = 1; i < args.Length; i++)
- n |= (int) args[i].Eval (domain);
- return domain.SetValue (sym, (object) n);
- }
-
- private static object logandeq (MExpression[] args, Domain domain)
- {
- MSymbol sym = (MSymbol) args[0].args[0].val;
- int n = (int) domain.GetValue (sym);
-
- for (int i = 1; i < args.Length; i++)
- n &= (int) args[i].Eval (domain);
- return domain.SetValue (sym, (object) n);
- }
-
- private static object lshift (MExpression[] args, Domain domain)
- {
- return (int) args[0].val << (int) args[1].val;
- }
-
- private static object lshifteq (MExpression[] args, Domain domain)
- {
- MSymbol sym = (MSymbol) args[0].args[0].val;
- int n = (int) domain.GetValue (sym);
-
- n <<= (int) args[1].Eval (domain);
- return domain.SetValue (sym, (object) n);
- }
-
- private static object rshift (MExpression[] args, Domain domain)
- {
- return (int) args[0].val >> (int) args[1].val;
- }
-
- private static object rshifteq (MExpression[] args, Domain domain)
- {
- MSymbol sym = (MSymbol) args[0].args[0].val;
- int n = (int) domain.GetValue (sym);
-
- n >>= (int) args[1].Eval (domain);
- return domain.SetValue (sym, (object) n);
- }
-
- private static object eq (MExpression[] args, Domain domain)
- {
- int n = (int) args[0].val;
-
- for (int i = 1; i < args.Length; i++)
- if (n != (int) args[i].val)
- return false;
- return true;
- }
-
- private static object noteq (MExpression[] args, Domain domain)
- {
- return ((int) args[0].val != (int) args[1].val);
- }
-
- private static object less (MExpression[] args, Domain domain)
- {
- int n = (int) args[0].val;
-
- for (int i = 1; i < args.Length; i++)
- {
- int n1 = (int) args[i].val;
- if (n >= n1)
- return false;
- n = n1;
- }
- return true;
- }
-
- private static object lesseq (MExpression[] args, Domain domain)
- {
- int n = (int) args[0].val;
- for (int i = 1; i < args.Length; i++)
- {
- int n1 = (int) args[i].val;
- if (n > n1)
- return false;
- n = n1;
- }
- return true;
- }
-
- private static object more (MExpression[] args, Domain domain)
- {
- int n = (int) args[0].val;
- for (int i = 1; i < args.Length; i++)
- {
- int n1 = (int) args[i].val;
- if (n <= n1)
- return false;
- n = n1;
- }
- return true;
- }
-
- private static object moreeq (MExpression[] args, Domain domain)
- {
- int n = (int) args[0].val;
- for (int i = 1; i < args.Length; i++)
- {
- int n1 = (int) args[i].val;
- if (n < n1)
- return false;
- n = n1;
- }
- return true;
- }
-
- private static object progn (MExpression[] args, Domain domain)
- {
- object result = false;
-
- foreach (MExpression e in args)
- result = e.Eval (domain);
- return result;
- }
-
- private static bool check_condition (MExpression condition, Domain domain)
- {
- object result = condition.Eval (domain);
- return (result is bool ? (bool) result
- : result is int ? ((int) result) != 0
- : true);
- }
-
- private static object ifclause (MExpression[] args, Domain domain)
- {
- object result = false;
-
- if (check_condition (args[0], domain))
- result = args[1].Eval (domain);
- else
- for (int i = 2; i < args.Length; i++)
- result = args[i].Eval (domain);
- return result;
- }
-
- private static object whenclause (MExpression[] args, Domain domain)
- {
- object result = false;
-
- if (check_condition (args[0], domain))
- for (int i = 1; i < args.Length; i++)
- result = args[i].Eval (domain);
- return result;
- }
-
- private static object whileclause (MExpression[] args, Domain domain)
- {
- while (check_condition (args[0], domain))
- for (int i = 1; i < args.Length; i++)
- args[i].Eval (domain);
- return false;
- }
-
- // (cond (COND1 ...) (COND2 ...) ...)
- // => (cond (when COND1 ...) (when COND2 ...) ...)
- private static void translate_cond (MPlist plist, Domain domain)
- {
- if (plist.IsPlist)
- {
- plist = plist.Plist;
- if (plist.IsSymbol && plist.Symbol == Mcond)
- {
- plist.val = Mprogn;
- for (plist = plist.next; ! plist.IsEmpty; plist = plist.next)
- {
- if (! plist.IsPlist)
- throw new Exception ("Invalid cond form: " + plist);
- plist.Plist.Push (MSymbol.symbol, Mwhen);
- }
- }
- }
- }
-
- private Function function;
- private MExpression[] args;
- private object val;
-
- public MExpression[] Args { get { return args; } }
- public object Val { get { return val; } }
-
- private MExpression (object val)
- {
- this.val = val;
- }
-
- // EXPR = SYMBOL | MTEXT | INTEGER | FUNCALL | PROGN
- // FUNCALL = '(' SYMBOL EXPR* ')'
- // PROGN = '(' EXPR * ')'
- private MExpression (MSymbol key, object val, Domain domain)
- {
- if (key == MSymbol.symbol)
- {
- function = Function.varref;
- args = new MExpression[1];
- args[0] = new MExpression (val);
- }
- else if (key == MSymbol.integer
- || key == MSymbol.mtext)
- {
- this.val = val;
- }
- else if (key == MSymbol.plist)
- {
- MPlist p = (MPlist) val;
-
- if (p.IsSymbol)
- {
- MSymbol sym = p.Symbol;
-
- if (sym == Mdefun)
- {
- p = p.next;
- if (! p.IsSymbol)
- throw new Exception ("Invalid function argument: "
- + p.val);
- sym = p.Symbol;
- p = p.next;
- if (! p.IsPlist)
- throw new Exception ("Invalid function argument: "
- + p.val);
- domain.Defun (sym, p.Plist, p.next);
- // This Mexpression is just a dummy.
- }
- else
- {
- function = domain.GetFunc (sym);
- p = p.next;
- int nargs = p.Count;
- if (nargs < function.min_arg
- || (function.max_arg >= 0 && nargs > function.max_arg))
- throw new Exception ("Invalid number of arguments to: "
- + sym + " " + nargs);
- args = new MExpression[nargs];
- for (int i = 0; i < nargs; i++, p = p.next)
- {
- domain.Translate (p);
- args[i] = new MExpression (p.key, p.val, domain);
- }
- }
- }
- else
- {
- args = new MExpression[1];
- args[0] = new MExpression (p, domain);
- }
- }
- else
- throw new Exception ("Invalid expression: " + key + ":" + val);
- }
-
- public MExpression (MPlist plist, Domain domain)
- {
- function = Function.block;
- args = new MExpression[plist.Count];
- for (int i = 0; ! plist.IsEmpty; i++, plist = plist.next)
- {
- domain.Translate (plist);
- args[i] = new MExpression (plist.key, plist.val, domain);
- }
- }
-
- public MExpression (XmlNode node, Domain domain)
- {
- MSymbol sym = node.Name;
-
- function = domain.GetFunc (sym);
-
- XmlAttributeCollection attrs = node.Attributes;
-
- int nargs = attrs.Count + node.ChildNodes.Count;
- if (nargs < function.min_arg
- || (function.max_arg >= 0 && nargs > function.max_arg))
- throw new Exception ("Invalid number of arguments: " + node.InnerXml);
- args = new MExpression[nargs];
- int i;
- for (i = 0; i < attrs.Count; i++)
- {
- string str = sttrs[i].Value;
-
- }
- }
-
- public object Eval (Domain domain)
- {
- if (function == null)
- {
- if (val is MSymbol)
- val = domain.GetValue ((MSymbol) val);
- }
- else
- val = function.Call (args, domain);
- return val;
- }
-
- public override string ToString ()
- {
- string str;
-
- if (function != null)
- {
- str = "(" + function.Name.Name;
- if (args != null)
- foreach (MExpression e in args)
- str += " " + e.ToString ();
- str += ")";
- }
- else if (val != null)
- {
- if (val is MText)
- str = "\"" + (string) ((MText) val) + "\"";
- else
- str = val.ToString ();
- }
- else
- str = "()";
- return str;
- }
- }
-}
private static Symbol Qdefun = "defun";
private static Symbol Qfname = "fname";
private static Symbol Qargs = "args";
- private static Symbol Qargs_unevalled = "args-unevalled";
private static Symbol Qfixed = "fixed";
private static Symbol Qoptional = "optional";
private static Symbol Qrest = "rest";
private static Symbol Qdescription = "description";
private static Symbol Qrange = "range";
- public abstract class Function
+ internal abstract class Function
{
public Symbol name;
public int min_arg, max_arg;
}
}
- internal class Lambda : Function
+ private static void parse_head (Domain domain, XmlNode node,
+ out Symbol name,
+ out int min_arg, out int max_arg,
+ out Variable[] args)
+ {
+ int nfixed = 0;
+ int noptional = 0;
+ int nrest = 0;
+ name = node.Attributes[Qfname].Value;
+
+ node = node.FirstChild;
+ if (node != null && node.Name == Qargs)
+ {
+ XmlNode n;
+ for (n = node.FirstChild; n != null; n = n.NextSibling)
+ {
+ if (n.Name == Qfixed)
+ nfixed++;
+ else if (n.Name == Qoptional)
+ noptional++;
+ else if (n.Name == Qrest)
+ 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 ((Symbol) n.Attributes[0].Value);
+ if (nrest == 1)
+ max_arg = - max_arg;
+ }
+ else
+ {
+ min_arg = max_arg = 0;
+ args = null;
+ }
+ }
+
+ private static void parse_body (Domain domain, XmlNode node,
+ out Term[] body)
+ {
+ for (node = node.FirstChild; node != null; node = node.NextSibling)
+ if (node.Name != Qdescription
+ && node.Name != Qargs)
+ 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 (domain, node);
+ }
+ else
+ body = null;
+ }
+
+ internal class Macro : Function
{
- internal bool args_evalled;
internal Variable[] args;
internal Term[] body;
- public Lambda (Domain domain, XmlNode node)
+ public Macro (Domain domain, XmlNode node)
{
- int nfixed = 0;
- int noptional = 0;
- int nrest = 0;
- name = node.Attributes[Qfname].Value;
-
- node = node.FirstChild;
- if (node != null
- && (node.Name == Qargs || node.Name == Qargs_unevalled))
- {
- XmlNode n;
- args_evalled = node.Name == Qargs;
- for (n = node.FirstChild; n != null; n = n.NextSibling)
- {
- if (n.Name == Qfixed)
- nfixed++;
- else if (n.Name == Qoptional)
- noptional++;
- else if (n.Name == Qrest)
- 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 ((Symbol) n.Attributes[0].Value);
- if (nrest == 1)
- max_arg = - max_arg;
- }
- else
+ parse_head (domain, node, out name, out min_arg, out max_arg,
+ out args);
+ }
+
+ public void SetBody (Domain domain, XmlNode node)
+ {
+ parse_body (domain, node, out body);
+ }
+
+ public override Term Call (Domain domain, Variable vari, Term[] args)
+ {
+ Bindings current = domain.bindings;
+ Term result = Zero;
+
+ try {
+ int i;
+ Term[] newargs = new Term[args.Length];
+ for (i = 0; i < min_arg; i++)
+ newargs[i] = args[i].Eval (domain);
+ args = newargs;
+ for (i = 0; i < min_arg; i++)
+ domain.Bind (this.args[i], args[i]);
+ if (body != null)
{
- min_arg = max_arg = 0;
+ 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 Lambda : Function
+ {
+ internal Variable[] args;
+ internal Term[] body;
+
+ public Lambda (Domain domain, XmlNode node)
+ {
+ parse_head (domain, node, out name, out min_arg, out max_arg,
+ out args);
}
- public Lambda (Domain domain, Symbol name,
- bool args_evalled, Symbol[] args)
+ public Lambda (Domain domain, Symbol name, Symbol[] args)
{
int nfixed = 0;
int noptional = 0;
int nrest = 0;
this.name = name;
- this.args_evalled = args_evalled;
if (args != null)
{
int i = 0;
public void SetBody (Domain domain, XmlNode node)
{
- for (node = node.FirstChild; node != null; node = node.NextSibling)
- if (node.Name != Qdescription
- && node.Name != Qargs
- && node.Name != Qargs_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 (domain, node);
- }
+ parse_body (domain, node, out body);
}
public void SetBody (Term[] body)
try {
int i;
- if (args_evalled)
+ if (args != null)
{
Term[] newargs = new Term[args.Length];
for (i = 0; i < min_arg; i++)
if (body != null)
{
try {
- if (args_evalled)
- domain.Catch (CatchTag.Return);
+ domain.Catch (CatchTag.Return);
foreach (Term term in body)
{
result = term.Eval (domain);
return result;
}
} finally {
- if (args_evalled)
- domain.Uncatch ();
+ domain.Uncatch ();
}
}
} finally {
public void DefTerm (Symbol name, TermParser parser)
{
+ if (termtypes.ContainsKey (name)
+ || functions.ContainsKey (name))
+ throw new Exception ("already defined: " + name);
termtypes[name] = new TermType (name, parser);
}
int min_arg, int max_arg, params string[] aliases)
{
Symbol name = str;
+ if (termtypes.ContainsKey (name))
+ throw new Exception ("already defined as termtype: " + name);
Function func = new Function.Subroutine (builtin, name, setvar,
min_arg, max_arg);
functions[name] = func;
params string[] aliases)
{
Symbol name = str;
+ if (termtypes.ContainsKey (name))
+ throw new Exception ("already defined as termtype: " + name);
Function func = new Function.SpecialForm (builtin, name,
min_arg, max_arg);
functions[name] = func;
functions[(Symbol) alias] = functions[(Symbol) str];
}
- public void Defun (Symbol name, bool args_evalled,
- Symbol[] args, Term[] body, bool prototype)
+ public void Defun (Symbol name, Symbol[] args, Term[] body,
+ bool prototype)
{
Function func;
+ if (termtypes.ContainsKey (name))
+ throw new Exception ("already defined as termtype: " + name);
if (prototype || ! functions.TryGetValue (name, out func))
{
- func = new Function.Lambda (this, name, args_evalled, args);
+ func = new Function.Lambda (this, name, args);
functions[name] = func;
}
if (! prototype)
public void Defun (XmlNode node, bool prototype)
{
Symbol name = node.Attributes[Qfname].Value;
+ if (termtypes.ContainsKey (name))
+ throw new Exception ("already defined as termtype: " + name);
Function func;
if (prototype || ! functions.TryGetValue (name, out func))
functions[func.name] = func;
}
+ public void Defmacro (XmlNode node, bool prototype)
+ {
+ Symbol name = node.Attributes[Qfname].Value;
+ if (termtypes.ContainsKey (name))
+ throw new Exception ("already defined as termtype: " + name);
+ Function func;
+
+ if (prototype || ! functions.TryGetValue (name, out func))
+ {
+ func = new Function.Macro (this, node);
+ functions[name] = func;
+ }
+ if (! prototype)
+ ((Function.Macro) func).SetBody (this, node);
+ }
+
public Variable Defvar (XmlNode node)
{
Symbol name = node.Attributes[0].Value;
internal Variable vari;
internal Term[] args;
- private Funcall (Function func, Variable vari, Term[] args)
- {
- this.func = func;
- this.vari = vari;
- this.args = args;
- }
-
- public Funcall (Domain domain, Symbol fname, Term[] args)
- {
- func = domain.GetFunc (fname);
- if (args != null)
- {
- int nargs = args.Length;
- if (nargs < func.min_arg
- || (func.max_arg >= 0 && nargs > func.max_arg))
- throw new Exception ("Invalid number of arguments to: "
- + fname + " " + nargs);
- }
- this.args = args;
- }
-
- public Funcall (Domain domain, Symbol fname, Symbol vname, Term[] args)
+ public Funcall (Function func, Variable vari, Term[] args)
{
- func = domain.GetFunc (fname);
if (args != null)
{
int nargs = args.Length;
if (nargs < func.min_arg
|| (func.max_arg >= 0 && nargs > func.max_arg))
throw new Exception ("Invalid number of arguments to: "
- + fname + " " + nargs);
+ + func.name + " " + nargs);
}
+ this.func = func;
+ this.vari = vari;
this.args = args;
- if (vname != Qnull)
- vari = domain.GetVar (vname, true);
}
internal static TermValue parser (Domain domain, XmlNode node)
{
Symbol fname = node.Name;
- Symbol vname = Qnull;
XmlAttribute attr;
if (fname == Qfuncall)
fname = node.Attributes[Qfname].Value;
+ Function func = domain.GetFunc (fname);
+ Variable vari;
attr = node.Attributes[Qvname];
- if (attr != null)
- vname = attr.Value;
-
+ vari = attr == null ? null : domain.GetVar (attr.Value, true);
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]);
- return new Funcall (domain, fname, vname, args);
+ return new Funcall (func, vari, args);
}
public override Term Eval (Domain domain)
// <funcall fname="FNAME">...</funcall>
public Term (Domain domain, Symbol fname, Term[] args)
- {
- intval = 0;
- objval = new Funcall (domain, fname, args);
- }
+ : this (domain, fname, Qnull, args) { }
// <funcall fname="FNAME" vname="VNAME">...</funcall>
public Term (Domain domain, Symbol fname, Symbol vname, Term[] args)
{
intval = 0;
- objval = new Funcall (domain, fname, vname, args);
+
+ Function func = domain.GetFunc (fname);
+ Variable vari = vname == Qnull ? null : domain.GetVar (vname, true);
+ objval = new Funcall (func, vari, args);
}
public object Objval {
projects / m17n / m17n-lib-cs.git / commitdiff