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// Copyright 2010 Todd Ditchendorf
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#import "PKAST.h"
@interface PKAST ()
@property (nonatomic, retain) PKToken *token;
@property (nonatomic, retain) NSMutableArray *children;
@end
@implementation PKAST
+ (PKAST *)ASTWithToken:(PKToken *)tok {
return [[[self alloc] initWithToken:tok] autorelease];
}
- (id)init {
return [self initWithToken:nil];
}
- (id)initWithToken:(PKToken *)tok {
if (self = [super init]) {
self.token = tok;
}
return self;
}
- (void)dealloc {
self.token = nil;
self.children = nil;
[super dealloc];
}
- (NSString *)description {
return [token stringValue];
}
- (NSString *)treeDescription {
if (![children count]) {
return [self description];
}
NSMutableString *ms = [NSMutableString string];
if (![self isNil]) {
[ms appendFormat:@"(%@ ", [self description]];
}
NSInteger i = 0;
for (PKAST *child in children) {
if (i++) {
[ms appendFormat:@" %@", child];
} else {
[ms appendFormat:@"%@", child];
}
}
if (![self isNil]) {
[ms appendString:@")"];
}
return [[ms copy] autorelease];
}
- (NSInteger)type {
NSAssert2(0, @"%s is an abastract method. Must be overridden in %@", __PRETTY_FUNCTION__, NSStringFromClass([self class]));
return -1;
}
- (void)addChild:(PKAST *)c {
if (!children) {
self.children = [NSMutableArray array];
}
[children addObject:c];
}
- (BOOL)isNil {
return !token;
}
@synthesize token;
@synthesize children;
@end
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