Mercurial Hosting > luan
annotate src/luan/lib/json/JsonParser.java @ 1112:490f77bb2ad1
add JsonParser
author | Franklin Schmidt <fschmidt@gmail.com> |
---|---|
date | Wed, 02 Aug 2017 17:37:59 -0600 |
parents | src/luan/modules/parsers/Json.java@88b5b81cad4a |
children | 6c8ceca4a10b |
rev | line source |
---|---|
1112 | 1 package luan.lib.json; |
720 | 2 |
3 import java.util.List; | |
4 import java.util.ArrayList; | |
5 import java.util.Map; | |
6 import java.util.LinkedHashMap; | |
1112 | 7 import java.util.Collections; |
1111
88b5b81cad4a
move Parser to luan.lib.parser
Franklin Schmidt <fschmidt@gmail.com>
parents:
775
diff
changeset
|
8 import luan.lib.parser.Parser; |
88b5b81cad4a
move Parser to luan.lib.parser
Franklin Schmidt <fschmidt@gmail.com>
parents:
775
diff
changeset
|
9 import luan.lib.parser.ParseException; |
720 | 10 |
11 | |
1112 | 12 public final class JsonParser { |
720 | 13 |
14 public static Object parse(String text) throws ParseException { | |
1112 | 15 return new JsonParser(text).parse(); |
720 | 16 } |
17 | |
18 private final Parser parser; | |
19 | |
1112 | 20 private JsonParser(String text) { |
720 | 21 this.parser = new Parser(text); |
22 } | |
23 | |
24 private ParseException exception(String msg) { | |
25 return new ParseException(parser,msg); | |
26 } | |
27 | |
28 private Object parse() throws ParseException { | |
29 spaces(); | |
30 Object value = value(); | |
31 spaces(); | |
32 if( !parser.endOfInput() ) | |
33 throw exception("unexpected text"); | |
34 return value; | |
35 } | |
36 | |
37 private Object value() throws ParseException { | |
38 if( parser.match("null") ) | |
39 return null; | |
40 if( parser.match("true") ) | |
41 return Boolean.TRUE; | |
42 if( parser.match("false") ) | |
43 return Boolean.FALSE; | |
44 String s = string(); | |
45 if( s != null ) | |
46 return s; | |
47 Number n = number(); | |
48 if( n != null ) | |
49 return n; | |
1112 | 50 List a = array(); |
720 | 51 if( a != null ) |
52 return a; | |
1112 | 53 Map o = object(); |
720 | 54 if( o != null ) |
55 return o; | |
56 throw exception("invalid value"); | |
57 } | |
58 | |
59 private String string() throws ParseException { | |
60 parser.begin(); | |
61 if( !parser.match('"') ) | |
62 return parser.failure(null); | |
63 StringBuilder sb = new StringBuilder(); | |
64 while( parser.anyChar() ) { | |
65 char c = parser.lastChar(); | |
66 switch(c) { | |
67 case '"': | |
68 return parser.success(sb.toString()); | |
69 case '\\': | |
70 if( parser.anyChar() ) { | |
71 c = parser.lastChar(); | |
72 switch(c) { | |
73 case '"': | |
74 case '\\': | |
75 case '/': | |
76 sb.append(c); | |
77 continue; | |
78 case 'b': | |
79 sb.append('\b'); | |
80 continue; | |
81 case 'f': | |
82 sb.append('\f'); | |
83 continue; | |
84 case 'n': | |
85 sb.append('\n'); | |
86 continue; | |
87 case 'r': | |
88 sb.append('\r'); | |
89 continue; | |
90 case 't': | |
91 sb.append('\t'); | |
92 continue; | |
93 case 'u': | |
94 int n = 0; | |
95 for( int i=0; i<4; i++ ) { | |
96 int d; | |
97 if( parser.inCharRange('0','9') ) { | |
98 d = parser.lastChar() - '0'; | |
99 } else if( parser.inCharRange('a','f') ) { | |
100 d = parser.lastChar() - 'a' + 10; | |
101 } else if( parser.inCharRange('A','F') ) { | |
102 d = parser.lastChar() - 'A' + 10; | |
103 } else { | |
104 throw exception("invalid hex digit"); | |
105 } | |
106 n = 16*n + d; | |
107 } | |
108 sb.append((char)n); | |
109 continue; | |
110 } | |
111 } | |
112 throw exception("invalid escape char"); | |
113 default: | |
114 sb.append(c); | |
115 } | |
116 } | |
117 parser.failure(); | |
118 throw exception("unclosed string"); | |
119 } | |
120 | |
121 private Number number() { | |
122 int start = parser.begin(); | |
759
ae612dfc57cb
better handling of longs in rpc and json
Franklin Schmidt <fschmidt@gmail.com>
parents:
758
diff
changeset
|
123 boolean isFloat = false; |
720 | 124 parser.match('-'); |
125 if( !parser.match('0') ) { | |
126 if( !parser.inCharRange('1','9') ) | |
127 return parser.failure(null); | |
128 while( parser.inCharRange('0','9') ); | |
129 } | |
130 if( parser.match('.') ) { | |
131 if( !parser.inCharRange('0','9') ) | |
132 return parser.failure(null); | |
133 while( parser.inCharRange('0','9') ); | |
759
ae612dfc57cb
better handling of longs in rpc and json
Franklin Schmidt <fschmidt@gmail.com>
parents:
758
diff
changeset
|
134 isFloat = true; |
720 | 135 } |
136 if( parser.anyOf("eE") ) { | |
137 parser.anyOf("+-"); | |
138 if( !parser.inCharRange('0','9') ) | |
139 return parser.failure(null); | |
140 while( parser.inCharRange('0','9') ); | |
759
ae612dfc57cb
better handling of longs in rpc and json
Franklin Schmidt <fschmidt@gmail.com>
parents:
758
diff
changeset
|
141 isFloat = true; |
720 | 142 } |
143 String s = parser.textFrom(start); | |
759
ae612dfc57cb
better handling of longs in rpc and json
Franklin Schmidt <fschmidt@gmail.com>
parents:
758
diff
changeset
|
144 Number n; |
ae612dfc57cb
better handling of longs in rpc and json
Franklin Schmidt <fschmidt@gmail.com>
parents:
758
diff
changeset
|
145 if(isFloat) |
ae612dfc57cb
better handling of longs in rpc and json
Franklin Schmidt <fschmidt@gmail.com>
parents:
758
diff
changeset
|
146 n = Double.valueOf(s); |
ae612dfc57cb
better handling of longs in rpc and json
Franklin Schmidt <fschmidt@gmail.com>
parents:
758
diff
changeset
|
147 else |
ae612dfc57cb
better handling of longs in rpc and json
Franklin Schmidt <fschmidt@gmail.com>
parents:
758
diff
changeset
|
148 n = Long.valueOf(s); |
ae612dfc57cb
better handling of longs in rpc and json
Franklin Schmidt <fschmidt@gmail.com>
parents:
758
diff
changeset
|
149 return parser.success(n); |
720 | 150 } |
151 | |
1112 | 152 private List array() throws ParseException { |
720 | 153 parser.begin(); |
154 if( !parser.match('[') ) | |
155 return parser.failure(null); | |
156 spaces(); | |
157 if( parser.match(']') ) | |
1112 | 158 return parser.success(Collections.emptyList()); |
720 | 159 List list = new ArrayList(); |
160 list.add( value() ); | |
161 spaces(); | |
162 while( parser.match(',') ) { | |
163 spaces(); | |
164 list.add( value() ); | |
165 spaces(); | |
166 } | |
167 if( parser.match(']') ) | |
1112 | 168 return parser.success(list); |
720 | 169 if( parser.endOfInput() ) { |
170 parser.failure(); | |
171 throw exception("unclosed array"); | |
172 } | |
173 throw exception("unexpected text in array"); | |
174 } | |
175 | |
1112 | 176 private Map object() throws ParseException { |
720 | 177 parser.begin(); |
178 if( !parser.match('{') ) | |
179 return parser.failure(null); | |
180 spaces(); | |
181 if( parser.match('}') ) | |
1112 | 182 return parser.success(Collections.emptyMap()); |
720 | 183 Map map = new LinkedHashMap(); |
184 addEntry(map); | |
185 while( parser.match(',') ) { | |
186 spaces(); | |
187 addEntry(map); | |
188 } | |
189 if( parser.match('}') ) | |
1112 | 190 return parser.success(map); |
720 | 191 if( parser.endOfInput() ) { |
192 parser.failure(); | |
193 throw exception("unclosed object"); | |
194 } | |
195 throw exception("unexpected text in object"); | |
196 } | |
197 | |
198 private void addEntry(Map map) throws ParseException { | |
199 String key = string(); | |
200 if( key==null ) | |
201 throw exception("invalid object key"); | |
202 spaces(); | |
203 if( !parser.match(':') ) | |
204 throw exception("':' expected"); | |
205 spaces(); | |
206 Object value = value(); | |
207 spaces(); | |
208 map.put(key,value); | |
209 } | |
210 | |
211 private void spaces() { | |
212 while( parser.anyOf(" \t\r\n") ); | |
213 } | |
758
c29d11d675fd
added Json.toString() and rpc now sends tables as json
Franklin Schmidt <fschmidt@gmail.com>
parents:
720
diff
changeset
|
214 |
720 | 215 } |