121 lines
4.5 KiB
C#
121 lines
4.5 KiB
C#
//-----------------------------------------------------------------------
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//-----------------------------------------------------------------------
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// file="ExpSwitchToken.cs"
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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
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// obtaining a copy of this software and associated documentation
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// files (the “Software”), to deal in the Software without restriction,
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// including without limitation the rights to use, copy, modify, merge,
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// publish, distribute, sublicense, and/or sell copies of the Software,
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// and to permit persons to whom the Software is furnished to do so,
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// subject to the following conditions:
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//
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// The above copyright notice and
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// this permission notice shall be included in all copies
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// or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED “AS IS”,
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// WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH
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// THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 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.Text;
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namespace StgSharp.Script.Express
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{
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public class ExpSwitchToken : ExpToken
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{
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private Dictionary<ExpToken, ExpToken> _cases;
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private ExpToken _default;
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private ExpToken _target;
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public ExpSwitchToken(
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string name,
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ExpSchema context,
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ExpToken target,
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ExpToken defaultCase,
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params (ExpToken label, ExpToken op)[] cases )
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: base( name, context )
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{
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_target = target;
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_default = defaultCase;
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_cases = new Dictionary<ExpToken, ExpToken>();
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foreach( (ExpToken label, ExpToken op ) item in cases ) {
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if( item.op == null ) {
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_cases.Add( item.label, null! );
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} else {
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_cases.Add( item.label, item.op );
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}
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}
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}
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public ExpToken this[ ExpToken index ]
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{
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get
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{
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if( _cases.TryGetValue( index, out ExpToken? ret ) ) {
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return ret;
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}
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return _default;
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}
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}
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public override ExpToken Left => throw new NotImplementedException();
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public override ExpToken Next
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{
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get => throw new NotImplementedException();
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set => throw new NotImplementedException();
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}
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public override ExpToken Right => throw new NotImplementedException();
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public override IExpElementSource EqualityTypeConvert => throw new NotImplementedException(
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);
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public void AddOperationToDefault( ExpToken expressionRoot )
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{
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if( expressionRoot != null ) {
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_default.AppendToken( expressionRoot );
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}
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}
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/// <summary>
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/// Adds an expression to certain <see langword="case" />. The added expression will be run
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/// at last.
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/// </summary>
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/// <param name="label"> Label of case to add operation </param>
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/// <param name="expressionRoot"> Root token of the expression to be added. </param>
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/// <exception cref="ExpCaseNotFoundException"> Cannot fine the case label in current witch expression. </exception>
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public void AppendOperationToCase(
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ExpToken label,
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ExpToken expressionRoot )
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{
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AssertSchemaInclude( expressionRoot );
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if( _cases.TryGetValue( label, out ExpToken? op ) ) {
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op.AppendToken( expressionRoot );
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} else {
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throw new ExpCaseNotFoundException( this, label );
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}
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}
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public bool ContainsCase( ExpToken token )
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{
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return _cases.ContainsKey( token );
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}
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}
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}
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