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2025-08-25 09:50:30 +08:00
parent bd0e31e922
commit 1359ff4ecc
1630 changed files with 738486 additions and 2399 deletions
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+//-----------------------------------------------------------------------
+//-----------------------------------------------------------------------
+//     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; }
+
+        }
+
+    }
+}