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cacaodev
07b6e2b9f1
Conditional Expression : an expression using different expressions for evaluation, depending of a predicate result. Support for predicate parsing: ```TERNARY(predicate, trueExpression, falseExpression)``` With init, equal, evaluation, parsing tests.
84 lines
2.3 KiB
Plaintext
84 lines
2.3 KiB
Plaintext
/*
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* _CPConditionalExpression.j
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*
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* Created by cacaodev.
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* Copyright 2015.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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@import "_CPPredicate.j"
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@import "_CPExpression.j"
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@implementation _CPConditionalExpression : CPExpression
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{
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CPPredicate _predicate;
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CPExpression _trueExpression;
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CPExpression _falseExpression;
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}
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- (id)initWithPredicate:(CPPredicate)aPredicate trueExpression:(CPExpression)trueExpression falseExpression:(CPExpression)falseExpression
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{
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self = [super initWithExpressionType:CPConditionalExpressionType];
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if (self)
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{
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_predicate = aPredicate;
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_trueExpression = trueExpression;
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_falseExpression = falseExpression;
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}
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return self;
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}
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- (BOOL)isEqual:(id)object
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{
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if (self === object)
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return YES;
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if (object === nil || object.isa !== self.isa || ![[object predicate] isEqual:_predicate] || ![[object trueExpression] isEqual:_trueExpression] || ![[object falseExpression] isEqual:_falseExpression])
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return NO;
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return YES;
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}
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- (CPPredicate)predicate
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{
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return _predicate;
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}
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- (CPExpression)trueExpression
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{
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return _trueExpression;
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}
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- (CPExpression)falseExpression
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{
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return _falseExpression;
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}
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- (id)expressionValueWithObject:(id)object context:(CPDictionary)context
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{
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var eval = [_predicate evaluateWithObject:object substitutionVariables:context];
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var exp = eval ? _trueExpression : _falseExpression;
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return [exp expressionValueWithObject:object context:context];
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}
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- (CPString)description
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{
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return [CPString stringWithFormat:@"TERNARY(%@,%@,%@)", [_predicate predicateFormat], [_trueExpression description], [_falseExpression description]];
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}
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@end |