129 lines
5.3 KiB
C#
129 lines
5.3 KiB
C#
//-----------------------------------------------------------------------
|
|
// -----------------------------------------------------------------------
|
|
// file="ExpSyntaxAnalyzer.If"
|
|
// Project: StgSharp
|
|
// AuthorGroup: Nitload Space
|
|
// Copyright (c) Nitload Space. All rights reserved.
|
|
//
|
|
// Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
// of this software and associated documentation files (the "Software"), to deal
|
|
// in the Software without restriction, including without limitation the rights
|
|
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
// copies of the Software, and to permit persons to whom the Software is
|
|
// furnished to do so, subject to the following conditions:
|
|
//
|
|
// The above copyright notice and this permission notice shall be included in all
|
|
// copies or substantial portions of the Software.
|
|
//
|
|
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
// SOFTWARE.
|
|
//
|
|
// -----------------------------------------------------------------------
|
|
// -----------------------------------------------------------------------
|
|
using System;
|
|
using System.Collections.Generic;
|
|
using System.Linq;
|
|
using System.Text;
|
|
using System.Threading.Tasks;
|
|
using System.Xml.Linq;
|
|
|
|
using ExpKeyword = StgSharp.Script.Express.ExpressCompile.Keyword;
|
|
|
|
namespace StgSharp.Script.Express
|
|
{
|
|
public partial class ExpSyntaxAnalyzer
|
|
{
|
|
|
|
private bool AppendToken_IfBranch(Token t)
|
|
{
|
|
switch (t.Value)
|
|
{
|
|
case ExpKeyword.If:
|
|
IfBranchStateCache state = new IfBranchStateCache();
|
|
_cache.CurrentDepthMark.StateCache = state;
|
|
state.CurrentState = t.Value;
|
|
return true;
|
|
case ExpKeyword.Then:
|
|
state = _cache.StateOfCurrentDepth<IfBranchStateCache>();
|
|
if (state.CurrentState == ExpKeyword.If)
|
|
{
|
|
while (_cache.TryPopOperator(out Token op)) {
|
|
ConvertAndPushOneOperator(op);
|
|
}
|
|
_cache.PopOperand(out _, out ExpSyntaxNode? node);
|
|
state.CurrentState = t.Value;
|
|
state.BoolExpression = node;
|
|
} else
|
|
{
|
|
throw new ExpCompileException(
|
|
t, $"Keyword {t.Value} should be after keyword {ExpKeyword.Then}");
|
|
}
|
|
return true;
|
|
case ExpKeyword.Else:
|
|
state = _cache.StateOfCurrentDepth<IfBranchStateCache>();
|
|
if (state.CurrentState == ExpKeyword.Then)
|
|
{
|
|
ExpSyntaxNode node = _cache.PackAllStatements();
|
|
state.CurrentState = t.Value;
|
|
state.ExpressionIfTrue = node;
|
|
} else
|
|
{
|
|
throw new ExpCompileException(
|
|
t, $"Keyword {t.Value} should be after keyword {ExpKeyword.Then}");
|
|
}
|
|
return true;
|
|
|
|
case ExpKeyword.EndIf:
|
|
state = _cache.StateOfCurrentDepth<IfBranchStateCache>();
|
|
if (state.CurrentState == ExpKeyword.Then)
|
|
{
|
|
ExpSyntaxNode trueNode = _cache.PackAllStatements();
|
|
state.CurrentState = t.Value;
|
|
state.ExpressionIfTrue = trueNode;
|
|
state.ExpressionIfFalse = ExpSyntaxNode.Empty;
|
|
} else if (state.CurrentState == ExpKeyword.Else)
|
|
{
|
|
ExpSyntaxNode falseNode = _cache.PackAllStatements();
|
|
state.CurrentState = t.Value;
|
|
state.ExpressionIfFalse = falseNode;
|
|
} else
|
|
{
|
|
throw new ExpCompileException(
|
|
t,
|
|
$"Keyword {t.Value} should be after keyword {ExpKeyword.Then} or {ExpKeyword.Else}");
|
|
}
|
|
ExpIfNode ifNode = new ExpIfNode(
|
|
state.Begin, state.BoolExpression, state.ExpressionIfTrue,
|
|
state.ExpressionIfFalse);
|
|
_cache.DecreaseDepth();
|
|
_cache.StatementsInDepth.Push(ifNode);
|
|
return true;
|
|
default:
|
|
AppendToken_Common(t);
|
|
return true;
|
|
}
|
|
}
|
|
|
|
private class IfBranchStateCache : ICompileDepthState
|
|
{
|
|
|
|
public ExpSyntaxNode BoolExpression { get; set; }
|
|
|
|
public ExpSyntaxNode ExpressionIfTrue { get; set; }
|
|
|
|
public ExpSyntaxNode ExpressionIfFalse { get; set; }
|
|
|
|
public string CurrentState { get; set; }
|
|
|
|
public Token Begin { get; set; }
|
|
|
|
}
|
|
|
|
}
|
|
}
|