2 Copyright (C) 2009 Stig Brautaset. All rights reserved.
4 Redistribution and use in source and binary forms, with or without
5 modification, are permitted provided that the following conditions are met:
7 * Redistributions of source code must retain the above copyright notice, this
8 list of conditions and the following disclaimer.
10 * Redistributions in binary form must reproduce the above copyright notice,
11 this list of conditions and the following disclaimer in the documentation
12 and/or other materials provided with the distribution.
14 * Neither the name of the author nor the names of its contributors may be used
15 to endorse or promote products derived from this software without specific
16 prior written permission.
18 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
22 FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
24 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
25 CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
26 OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 #import "SBJsonWriter.h"
32 @interface SBJsonWriter ()
34 - (BOOL)appendValue:(id)fragment into:(NSMutableString*)json;
35 - (BOOL)appendArray:(NSArray*)fragment into:(NSMutableString*)json;
36 - (BOOL)appendDictionary:(NSDictionary*)fragment into:(NSMutableString*)json;
37 - (BOOL)appendString:(NSString*)fragment into:(NSMutableString*)json;
43 @implementation SBJsonWriter
45 static NSMutableCharacterSet *kEscapeChars;
48 kEscapeChars = [[NSMutableCharacterSet characterSetWithRange: NSMakeRange(0,32)] retain];
49 [kEscapeChars addCharactersInString: @"\"\\"];
54 @synthesize humanReadable;
57 @deprecated This exists in order to provide fragment support in older APIs in one more version.
58 It should be removed in the next major version.
60 - (NSString*)stringWithFragment:(id)value {
61 [self clearErrorTrace];
63 NSMutableString *json = [NSMutableString stringWithCapacity:128];
65 if ([self appendValue:value into:json])
72 - (NSString*)stringWithObject:(id)value {
74 if ([value isKindOfClass:[NSDictionary class]] || [value isKindOfClass:[NSArray class]]) {
75 return [self stringWithFragment:value];
78 if ([value respondsToSelector:@selector(proxyForJson)]) {
79 NSString *tmp = [self stringWithObject:[value proxyForJson]];
85 [self clearErrorTrace];
86 [self addErrorWithCode:EFRAGMENT description:@"Not valid type for JSON"];
92 return [@"\n" stringByPaddingToLength:1 + 2 * depth withString:@" " startingAtIndex:0];
95 - (BOOL)appendValue:(id)fragment into:(NSMutableString*)json {
96 if ([fragment isKindOfClass:[NSDictionary class]]) {
97 if (![self appendDictionary:fragment into:json])
100 } else if ([fragment isKindOfClass:[NSArray class]]) {
101 if (![self appendArray:fragment into:json])
104 } else if ([fragment isKindOfClass:[NSString class]]) {
105 if (![self appendString:fragment into:json])
108 } else if ([fragment isKindOfClass:[NSNumber class]]) {
109 if ('c' == *[fragment objCType])
110 [json appendString:[fragment boolValue] ? @"true" : @"false"];
112 [json appendString:[fragment stringValue]];
114 } else if ([fragment isKindOfClass:[NSNull class]]) {
115 [json appendString:@"null"];
116 } else if ([fragment respondsToSelector:@selector(proxyForJson)]) {
117 [self appendValue:[fragment proxyForJson] into:json];
120 [self addErrorWithCode:EUNSUPPORTED description:[NSString stringWithFormat:@"JSON serialisation not supported for %@", [fragment class]]];
126 - (BOOL)appendArray:(NSArray*)fragment into:(NSMutableString*)json {
127 if (maxDepth && ++depth > maxDepth) {
128 [self addErrorWithCode:EDEPTH description: @"Nested too deep"];
131 [json appendString:@"["];
134 for (id value in fragment) {
136 [json appendString:@","];
140 if ([self humanReadable])
141 [json appendString:[self indent]];
143 if (![self appendValue:value into:json]) {
149 if ([self humanReadable] && [fragment count])
150 [json appendString:[self indent]];
151 [json appendString:@"]"];
155 - (BOOL)appendDictionary:(NSDictionary*)fragment into:(NSMutableString*)json {
156 if (maxDepth && ++depth > maxDepth) {
157 [self addErrorWithCode:EDEPTH description: @"Nested too deep"];
160 [json appendString:@"{"];
162 NSString *colon = [self humanReadable] ? @" : " : @":";
164 NSArray *keys = [fragment allKeys];
166 keys = [keys sortedArrayUsingSelector:@selector(compare:)];
168 for (id value in keys) {
170 [json appendString:@","];
174 if ([self humanReadable])
175 [json appendString:[self indent]];
177 if (![value isKindOfClass:[NSString class]]) {
178 [self addErrorWithCode:EUNSUPPORTED description: @"JSON object key must be string"];
182 if (![self appendString:value into:json])
185 [json appendString:colon];
186 if (![self appendValue:[fragment objectForKey:value] into:json]) {
187 [self addErrorWithCode:EUNSUPPORTED description:[NSString stringWithFormat:@"Unsupported value for key %@ in object", value]];
193 if ([self humanReadable] && [fragment count])
194 [json appendString:[self indent]];
195 [json appendString:@"}"];
199 - (BOOL)appendString:(NSString*)fragment into:(NSMutableString*)json {
201 [json appendString:@"\""];
203 NSRange esc = [fragment rangeOfCharacterFromSet:kEscapeChars];
205 // No special chars -- can just add the raw string:
206 [json appendString:fragment];
209 NSUInteger length = [fragment length];
210 for (NSUInteger i = 0; i < length; i++) {
211 unichar uc = [fragment characterAtIndex:i];
213 case '"': [json appendString:@"\\\""]; break;
214 case '\\': [json appendString:@"\\\\"]; break;
215 case '\t': [json appendString:@"\\t"]; break;
216 case '\n': [json appendString:@"\\n"]; break;
217 case '\r': [json appendString:@"\\r"]; break;
218 case '\b': [json appendString:@"\\b"]; break;
219 case '\f': [json appendString:@"\\f"]; break;
222 [json appendFormat:@"\\u%04x", uc];
224 CFStringAppendCharacters((CFMutableStringRef)json, &uc, 1);
232 [json appendString:@"\""];