390 lines
11 KiB
Haxe
390 lines
11 KiB
Haxe
/*
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* Copyright (c) 2008, Nicolas Cannasse
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* All rights reserved.
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE HAXE PROJECT CONTRIBUTORS "AS IS" AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE HAXE PROJECT CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*/
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package hscript;
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import hscript.Expr;
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private enum Stop {
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SBreak;
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SContinue;
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SReturn( v : Dynamic );
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}
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class Interp {
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public var variables : Hash<Dynamic>;
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var locals : Hash<{ r : Dynamic }>;
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var binops : Hash<Expr -> Expr -> Dynamic>;
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var declared : Array<{ n : String, old : { r : Dynamic } }>;
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public function new() {
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locals = new Hash();
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declared = new Array();
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variables = new Hash();
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variables.set("null",null);
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variables.set("true",true);
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variables.set("false",false);
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initOps();
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}
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function initOps() {
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var me = this;
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binops = new Hash();
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binops.set("+",function(e1,e2) return me.expr(e1) + me.expr(e2));
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binops.set("-",function(e1,e2) return me.expr(e1) - me.expr(e2));
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binops.set("*",function(e1,e2) return me.expr(e1) * me.expr(e2));
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binops.set("/",function(e1,e2) return me.expr(e1) / me.expr(e2));
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binops.set("%",function(e1,e2) return me.expr(e1) % me.expr(e2));
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binops.set("&",function(e1,e2) return me.expr(e1) & me.expr(e2));
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binops.set("|",function(e1,e2) return me.expr(e1) | me.expr(e2));
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binops.set("^",function(e1,e2) return me.expr(e1) ^ me.expr(e2));
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binops.set("<<",function(e1,e2) return me.expr(e1) << me.expr(e2));
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binops.set(">>",function(e1,e2) return me.expr(e1) >> me.expr(e2));
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binops.set(">>>",function(e1,e2) return me.expr(e1) >>> me.expr(e2));
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binops.set("==",function(e1,e2) return me.expr(e1) == me.expr(e2));
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binops.set("!=",function(e1,e2) return me.expr(e1) != me.expr(e2));
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binops.set(">=",function(e1,e2) return me.expr(e1) >= me.expr(e2));
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binops.set("<=",function(e1,e2) return me.expr(e1) <= me.expr(e2));
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binops.set(">",function(e1,e2) return me.expr(e1) > me.expr(e2));
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binops.set("<",function(e1,e2) return me.expr(e1) < me.expr(e2));
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binops.set("||",function(e1,e2) return me.expr(e1) == true || me.expr(e2) == true);
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binops.set("&&",function(e1,e2) return me.expr(e1) == true && me.expr(e2) == true);
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binops.set("=",assign);
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binops.set("...",function(e1,e2) return new IntIter(me.expr(e1),me.expr(e2)));
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assignOp("+=",function(v1:Dynamic,v2:Dynamic) return v1 + v2);
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assignOp("-=",function(v1:Float,v2:Float) return v1 - v2);
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assignOp("*=",function(v1:Float,v2:Float) return v1 * v2);
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assignOp("/=",function(v1:Float,v2:Float) return v1 / v2);
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assignOp("%=",function(v1:Float,v2:Float) return v1 % v2);
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assignOp("&=",function(v1,v2) return v1 & v2);
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assignOp("|=",function(v1,v2) return v1 | v2);
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assignOp("^=",function(v1,v2) return v1 ^ v2);
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assignOp("<<=",function(v1,v2) return v1 << v2);
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assignOp(">>=",function(v1,v2) return v1 >> v2);
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assignOp(">>>=",function(v1,v2) return v1 >>> v2);
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}
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function assign( e1 : Expr, e2 : Expr ) : Dynamic {
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var v = expr(e2);
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switch( e1 ) {
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case EIdent(id):
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var l = locals.get(id);
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if( l == null )
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variables.set(id,v)
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else
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l.r = v;
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case EField(e,f):
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v = set(expr(e),f,v);
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case EArray(e,index):
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expr(e)[expr(index)] = v;
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default: throw Error.EInvalidOp("=");
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}
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return v;
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}
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function assignOp( op, fop : Dynamic -> Dynamic -> Dynamic ) {
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var me = this;
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binops.set(op,function(e1,e2) return me.evalAssignOp(op,fop,e1,e2));
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}
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function evalAssignOp(op,fop,e1,e2) : Dynamic {
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var v;
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switch( e1 ) {
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case EIdent(id):
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var l = locals.get(id);
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v = fop(expr(e1),expr(e2));
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if( l == null )
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variables.set(id,v)
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else
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l.r = v;
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case EField(e,f):
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var obj = expr(e);
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v = fop(get(obj,f),expr(e2));
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v = set(obj,f,v);
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case EArray(e,index):
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var arr = expr(e);
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var index = expr(index);
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v = fop(arr[index],expr(e2));
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arr[index] = v;
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default:
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throw Error.EInvalidOp(op);
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}
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return v;
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}
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function increment( e : Expr, prefix : Bool, delta : Int ) : Dynamic {
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switch(e) {
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case EIdent(id):
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var l = locals.get(id);
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var v : Dynamic = (l == null) ? variables.get(id) : l.r;
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if( prefix ) {
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v += delta;
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if( l == null ) variables.set(id,v) else l.r = v;
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} else
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if( l == null ) variables.set(id,v + delta) else l.r = v + delta;
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return v;
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case EField(e,f):
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var obj = expr(e);
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var v : Dynamic = get(obj,f);
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if( prefix ) {
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v += delta;
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set(obj,f,v);
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} else
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set(obj,f,v + delta);
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return v;
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case EArray(e,index):
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var arr = expr(e);
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var index = expr(index);
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var v = arr[index];
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if( prefix ) {
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v += delta;
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arr[index] = v;
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} else
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arr[index] = v + delta;
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return v;
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default:
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throw Error.EInvalidOp((delta > 0)?"++":"--");
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}
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}
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public function execute( expr : Expr ) : Dynamic {
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locals = new Hash();
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return exprReturn(expr);
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}
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function exprReturn(e) : Dynamic {
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try {
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return expr(e);
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} catch( e : Stop ) {
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switch( e ) {
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case SBreak: throw "Invalid break";
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case SContinue: throw "Invalid continue";
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case SReturn(v): return v;
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}
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}
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return null;
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}
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function duplicate<T>( h : Hash<T> ) {
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var h2 = new Hash();
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for( k in h.keys() )
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h2.set(k,h.get(k));
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return h2;
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}
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function restore( old : Int ) {
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while( declared.length > old ) {
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var d = declared.pop();
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locals.set(d.n,d.old);
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}
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}
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public function expr( e : Expr ) : Dynamic {
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switch( e ) {
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case EConst(c):
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switch( c ) {
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case CInt(v): return v;
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case CFloat(f): return f;
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case CString(s): return s;
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}
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case EIdent(id):
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var l = locals.get(id);
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if( l != null )
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return l.r;
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var v = variables.get(id);
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if( v == null && !variables.exists(v) )
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throw Error.EUnknownVariable(id);
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return v;
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case EVar(n,e):
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declared.push({ n : n, old : locals.get(n) });
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locals.set(n,{ r : (e == null)?null:expr(e) });
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return null;
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case EParent(e):
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return expr(e);
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case EBlock(exprs):
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var old = declared.length;
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var v = null;
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for( e in exprs )
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v = expr(e);
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restore(old);
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return v;
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case EField(e,f):
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return get(expr(e),f);
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case EBinop(op,e1,e2):
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var fop = binops.get(op);
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if( fop == null ) throw Error.EInvalidOp(op);
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return fop(e1,e2);
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case EUnop(op,prefix,e):
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switch(op) {
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case "!":
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return expr(e) != true;
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case "-":
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return -expr(e);
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case "++":
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return increment(e,prefix,1);
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case "--":
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return increment(e,prefix,-1);
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default:
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throw Error.EInvalidOp(op);
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}
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case ECall(e,params):
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var args = new Array();
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for( p in params )
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args.push(expr(p));
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switch(e) {
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case EField(e,f):
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var obj = expr(e);
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if( obj == null ) throw Error.EInvalidAccess(f);
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return call(obj,Reflect.field(obj,f),args);
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default:
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return call(null,expr(e),args);
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}
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case EIf(econd,e1,e2):
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return if( expr(econd) == true ) expr(e1) else if( e2 == null ) null else expr(e2);
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case EWhile(econd,e):
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whileLoop(econd,e);
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return null;
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case EFor(v,it,e):
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forLoop(v,it,e);
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return null;
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case EBreak:
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throw SBreak;
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case EContinue:
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throw SContinue;
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case EReturn(e):
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throw SReturn((e == null)?null:expr(e));
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case EFunction(params,fexpr,name):
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var capturedLocals = duplicate(locals);
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var me = this;
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var f = function(args:Array<Dynamic>) {
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if( args.length != params.length ) throw "Invalid number of parameters";
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var old = me.locals;
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me.locals = me.duplicate(capturedLocals);
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for( i in 0...params.length )
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me.locals.set(params[i],{ r : args[i] });
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var r = me.exprReturn(fexpr);
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me.locals = old;
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return r;
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};
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var f = Reflect.makeVarArgs(f);
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if( name != null )
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variables.set(name,f);
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return f;
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case EArrayDecl(arr):
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var a = new Array();
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for( e in arr )
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a.push(expr(e));
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return a;
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case EArray(e,index):
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return expr(e)[expr(index)];
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case ENew(cl,params):
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var a = new Array();
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for( e in params )
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a.push(expr(e));
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return cnew(cl,a);
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case EThrow(e):
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throw expr(e);
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case ETry(e,n,ecatch):
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var old = declared.length;
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try {
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var v : Dynamic = expr(e);
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restore(old);
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return v;
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} catch( err : Stop ) {
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throw err;
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} catch( err : Dynamic ) {
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// restore vars
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restore(old);
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// declare 'v'
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declared.push({ n : n, old : locals.get(n) });
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locals.set(n,{ r : err });
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var v : Dynamic = expr(ecatch);
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restore(old);
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return v;
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}
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}
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return null;
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}
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function whileLoop(econd,e) {
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var old = declared.length;
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while( expr(econd) == true ) {
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try {
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expr(e);
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} catch( err : Stop ) {
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switch(err) {
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case SContinue:
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case SBreak: break;
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case SReturn(_): throw err;
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}
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}
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}
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restore(old);
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}
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function makeIterator( v : Dynamic ) : Iterator<Dynamic> {
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try v = v.iterator() catch( e : Dynamic ) {};
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if( v.hasNext == null || v.next == null ) throw Error.EInvalidIterator(v);
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return v;
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}
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function forLoop(n,it,e) {
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var old = declared.length;
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declared.push({ n : n, old : locals.get(n) });
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var it = makeIterator(expr(it));
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while( it.hasNext() ) {
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locals.set(n,{ r : it.next() });
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try {
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expr(e);
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} catch( err : Stop ) {
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switch( err ) {
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case SContinue:
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case SBreak: break;
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case SReturn(_): throw err;
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}
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}
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}
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restore(old);
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}
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function get( o : Dynamic, f : String ) : Dynamic {
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if( o == null ) throw Error.EInvalidAccess(f);
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return Reflect.field(o,f);
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}
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function set( o : Dynamic, f : String, v : Dynamic ) : Dynamic {
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if( o == null ) throw Error.EInvalidAccess(f);
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Reflect.setField(o,f,v);
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return v;
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}
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function call( o : Dynamic, f : Dynamic, args : Array<Dynamic> ) : Dynamic {
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return Reflect.callMethod(o,f,args);
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}
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function cnew( cl : String, args : Array<Dynamic> ) : Dynamic {
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return Type.createInstance(Type.resolveClass(cl),args);
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}
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} |