mirror of
https://github.com/SSCLI/sscli_20021101
synced 2026-06-08 12:28:57 +00:00
yallie
85 lines
2.9 KiB
C#
85 lines
2.9 KiB
C#
// ==++==
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//
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//
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// Copyright (c) 2002 Microsoft Corporation. All rights reserved.
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//
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// The use and distribution terms for this software are contained in the file
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// named license.txt, which can be found in the root of this distribution.
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// By using this software in any fashion, you are agreeing to be bound by the
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// terms of this license.
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//
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// You must not remove this notice, or any other, from this software.
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//
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//
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// ==--==
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namespace Microsoft.JScript
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{
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using System;
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using System.Collections;
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using System.Reflection;
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using System.Reflection.Emit;
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internal sealed class Conditional : AST{
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private AST condition;
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private AST operand1;
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private AST operand2;
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internal Conditional(Context context, AST condition, AST operand1, AST operand2)
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: base(context) {
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this.condition = condition;
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this.operand1 = operand1;
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this.operand2 = operand2;
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}
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internal override Object Evaluate(){
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if (Convert.ToBoolean(this.condition.Evaluate()))
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return this.operand1.Evaluate();
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else
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return this.operand2.Evaluate();
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}
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internal override AST PartiallyEvaluate(){
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this.condition = this.condition.PartiallyEvaluate();
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ScriptObject current_scope = Globals.ScopeStack.Peek();
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while (current_scope is WithObject) current_scope = current_scope.GetParent();
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if (current_scope is FunctionScope){
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FunctionScope scope = (FunctionScope)current_scope;
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BitArray before = scope.DefinedFlags;
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this.operand1 = this.operand1.PartiallyEvaluate();
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BitArray after1 = scope.DefinedFlags;
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scope.DefinedFlags = before;
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this.operand2 = this.operand2.PartiallyEvaluate();
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BitArray after2 = scope.DefinedFlags;
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int n = after1.Length;
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int m = after2.Length;
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if (n < m) after1.Length = m;
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if (m < n) after2.Length = n;
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scope.DefinedFlags = after1.And(after2);
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}else{
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this.operand1 = this.operand1.PartiallyEvaluate();
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this.operand2 = this.operand2.PartiallyEvaluate();
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}
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return this;
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}
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internal override void TranslateToIL(ILGenerator il, Type rtype){
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Label else_label = il.DefineLabel();
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Label endif_label = il.DefineLabel();
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this.condition.TranslateToConditionalBranch(il, false, else_label, false);
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this.operand1.TranslateToIL(il, rtype);
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il.Emit(OpCodes.Br, endif_label);
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il.MarkLabel(else_label);
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this.operand2.TranslateToIL(il, rtype);
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il.MarkLabel(endif_label);
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}
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internal override void TranslateToILInitializer(ILGenerator il){
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this.condition.TranslateToILInitializer(il);
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this.operand1.TranslateToILInitializer(il);
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this.operand2.TranslateToILInitializer(il);
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}
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}
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}
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