105 lines
4.1 KiB
C#
105 lines
4.1 KiB
C#
//-----------------------------------------------------------------------
|
|
//-----------------------------------------------------------------------
|
|
// file="ExpNodeGenerator.If.cs"
|
|
// 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 ExpKeyword = StgSharp.Script.Express.ExpressCompile.Keyword;
|
|
|
|
namespace StgSharp.Script.Express
|
|
{
|
|
public partial class ExpNodeGenerator
|
|
{
|
|
|
|
private bool TryParseIfExpression( 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 ) { } 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 ) { } 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 )
|
|
{
|
|
//no else occur
|
|
} else if( state.CurrentState == ExpKeyword.Else )
|
|
{
|
|
// else occur
|
|
} else
|
|
{
|
|
throw new ExpCompileException(
|
|
t,
|
|
$"Keyword {t.Value} should be after keyword {ExpKeyword.Then} or {ExpKeyword.Else}" );
|
|
}
|
|
return true;
|
|
default:
|
|
AppendToken_common( t );
|
|
return true;
|
|
}
|
|
}
|
|
|
|
private class IfBranchStateCache : ICompileDepthState
|
|
{
|
|
|
|
public ExpNode BoolExpression { get; set; }
|
|
|
|
public ExpNode ExpressionIfTrue { get; set; }
|
|
|
|
public ExpNode ExpressionIfFalse { get; set; }
|
|
|
|
public string CurrentState { get; set; }
|
|
|
|
}
|
|
|
|
}
|
|
}
|