129 lines
5.0 KiB
C#
129 lines
5.0 KiB
C#
//-----------------------------------------------------------------------
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// -----------------------------------------------------------------------
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// file="ExpSyntaxAnalyzer.CaseOf"
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// Project: StgSharp
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// AuthorGroup: Nitload Space
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// Copyright (c) Nitload Space. All rights reserved.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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//
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// -----------------------------------------------------------------------
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// -----------------------------------------------------------------------
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using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using ExpKeyword = StgSharp.Script.Express.ExpressCompile.Keyword;
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namespace StgSharp.Script.Express
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{
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public partial class ExpSyntaxAnalyzer
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{
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private bool AppendToken_CaseOf(Token t)
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{
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Token op;
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ExpSyntaxNode root;
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switch (t.Value)
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{
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case ExpKeyword.Case:
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CaseOfStateCache state = new CaseOfStateCache(t);
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_cache.CurrentDepthMark.StateCache = state;
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state.CurrentState = t.Value;
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return true;
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case ExpKeyword.Of:
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state = _cache.StateOfCurrentDepth<CaseOfStateCache>();
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while (_cache.TryPopOperator(out op)) {
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ConvertAndPushOneOperator(op);
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}
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_cache.PopOperand(out _, out root);
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state.CaseExpression = root;
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state.CurrentState = t.Value;
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return true;
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case ":":
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state = _cache.StateOfCurrentDepth<CaseOfStateCache>();
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if (state.CurrentState != ExpKeyword.Of && state.CurrentState != ExpKeyword.Otherwise)
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{
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root = _cache.PackAllStatements();
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state.CloseCurrentCase(root);
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}
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while (_cache.TryPopOperator(out op)) {
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ConvertAndPushOneOperator(op);
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}
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if (!_cache.PopOperand(out _, out root))
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{
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// sth wrong, case expression cannot generate;
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}
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state.CurrentCase = root;
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return true;
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case ExpKeyword.Otherwise:
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state = _cache.StateOfCurrentDepth<CaseOfStateCache>();
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root = _cache.PackAllStatements();
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state.CloseCurrentCase(root);
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state.CurrentState = t.Value;
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return true;
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case ExpKeyword.EndCase:
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state = _cache.StateOfCurrentDepth<CaseOfStateCache>();
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root = _cache.PackAllStatements();
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state.CloseCurrentCase(root);
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root = new ExpSwitchNode(
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state.Begin, state.CaseExpression, state.DefaultCase, state.Cases);
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_cache.DecreaseDepth();
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_cache.StatementsInDepth.Push(root);
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return true;
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default:
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AppendToken_Common(t);
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return true;
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}
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}
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private class CaseOfStateCache : ICompileDepthState
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{
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public CaseOfStateCache(Token t)
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{
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Begin = t;
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}
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public Dictionary<ExpSyntaxNode, ExpSyntaxNode> Cases { get; } = new Dictionary<ExpSyntaxNode, ExpSyntaxNode>(
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);
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public ExpSyntaxNode CaseExpression { get; set; }
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public ExpSyntaxNode DefaultCase { get; set; }
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public ExpSyntaxNode CurrentCase { get; set; }
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public string CurrentState { get; set; }
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public Token Begin { get; init; }
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public void CloseCurrentCase(ExpSyntaxNode root)
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{
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Cases.Add(CurrentCase, root);
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}
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}
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}
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}
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