1447
|
1 package luan.modules.parsers;
|
|
2
|
|
3 import goodjava.parser.Parser;
|
|
4 import goodjava.parser.ParseException;
|
|
5 import luan.Luan;
|
|
6 import luan.LuanTable;
|
|
7 import luan.LuanException;
|
|
8
|
|
9
|
|
10 public final class LuanParser {
|
|
11
|
1562
|
12 public static Object parse(String text) throws ParseException {
|
|
13 return new LuanParser(text).parse();
|
1447
|
14 }
|
|
15
|
|
16 private static final Object NULL = new Object();
|
|
17 private final Parser parser;
|
|
18
|
1562
|
19 private LuanParser(String text) {
|
1447
|
20 this.parser = new Parser(text);
|
|
21 }
|
|
22
|
|
23 private ParseException exception(String msg) {
|
|
24 return new ParseException(parser,msg);
|
|
25 }
|
|
26
|
|
27 private Object parse() throws ParseException {
|
|
28 do { spaces(); } while( endOfLine() );
|
|
29 Object value = requiredValue();
|
|
30 do { spaces(); } while( endOfLine() );
|
|
31 if( !parser.endOfInput() )
|
|
32 throw exception("unexpected text");
|
|
33 return value;
|
|
34 }
|
|
35
|
|
36 private Object requiredValue() throws ParseException {
|
|
37 Object value = value();
|
|
38 if( value == null )
|
|
39 throw exception("invalid value");
|
|
40 if( value == NULL )
|
|
41 return null;
|
|
42 return value;
|
|
43 }
|
|
44
|
|
45 private Object value() throws ParseException {
|
|
46 if( parser.match("nil") )
|
|
47 return NULL;
|
|
48 if( parser.match("true") )
|
|
49 return Boolean.TRUE;
|
|
50 if( parser.match("false") )
|
|
51 return Boolean.FALSE;
|
|
52 String s = string();
|
|
53 if( s != null )
|
|
54 return s;
|
|
55 Number n = number();
|
|
56 if( n != null )
|
|
57 return n;
|
|
58 LuanTable tbl = table();
|
|
59 if( tbl != null )
|
|
60 return tbl;
|
|
61 return null;
|
|
62 }
|
|
63
|
|
64 private String string() throws ParseException {
|
|
65 parser.begin();
|
|
66 if( !parser.match('"') )
|
|
67 return parser.failure(null);
|
|
68 StringBuilder sb = new StringBuilder();
|
|
69 while( parser.anyChar() ) {
|
|
70 char c = parser.lastChar();
|
|
71 switch(c) {
|
|
72 case '"':
|
|
73 return parser.success(sb.toString());
|
|
74 case '\\':
|
|
75 if( parser.anyChar() ) {
|
|
76 c = parser.lastChar();
|
|
77 switch(c) {
|
|
78 case '"':
|
|
79 case '\'':
|
|
80 case '\\':
|
|
81 sb.append(c);
|
|
82 continue;
|
|
83 case 'b':
|
|
84 sb.append('\b');
|
|
85 continue;
|
|
86 case 'f':
|
|
87 sb.append('\f');
|
|
88 continue;
|
|
89 case 'n':
|
|
90 sb.append('\n');
|
|
91 continue;
|
|
92 case 'r':
|
|
93 sb.append('\r');
|
|
94 continue;
|
|
95 case 't':
|
|
96 sb.append('\t');
|
|
97 continue;
|
|
98 case 'u':
|
|
99 int n = 0;
|
|
100 for( int i=0; i<4; i++ ) {
|
|
101 int d;
|
|
102 if( parser.inCharRange('0','9') ) {
|
|
103 d = parser.lastChar() - '0';
|
|
104 } else if( parser.inCharRange('a','f') ) {
|
|
105 d = parser.lastChar() - 'a' + 10;
|
|
106 } else if( parser.inCharRange('A','F') ) {
|
|
107 d = parser.lastChar() - 'A' + 10;
|
|
108 } else {
|
|
109 throw exception("invalid hex digit");
|
|
110 }
|
|
111 n = 16*n + d;
|
|
112 }
|
|
113 sb.append((char)n);
|
|
114 continue;
|
|
115 }
|
|
116 }
|
|
117 throw exception("invalid escape char");
|
|
118 default:
|
|
119 sb.append(c);
|
|
120 }
|
|
121 }
|
|
122 parser.failure();
|
|
123 throw exception("unclosed string");
|
|
124 }
|
|
125
|
|
126 private Number number() {
|
|
127 parser.begin();
|
|
128 if( parser.match("double") ) {
|
|
129 Number n = inParens();
|
|
130 if( n==null )
|
|
131 return parser.failure(null);
|
|
132 n = Luan.asDouble(n);
|
|
133 if( n==null )
|
|
134 return parser.failure(null);
|
|
135 return n;
|
|
136 } else if( parser.match("float") ) {
|
|
137 Number n = inParens();
|
|
138 if( n==null )
|
|
139 return parser.failure(null);
|
|
140 n = Luan.asFloat(n);
|
|
141 if( n==null )
|
|
142 return parser.failure(null);
|
|
143 return n;
|
|
144 } else if( parser.match("integer") ) {
|
|
145 Number n = inParens();
|
|
146 if( n==null )
|
|
147 return parser.failure(null);
|
|
148 n = Luan.asInteger(n);
|
|
149 if( n==null )
|
|
150 return parser.failure(null);
|
|
151 return n;
|
|
152 } else if( parser.match("long") ) {
|
|
153 Number n = inParens();
|
|
154 if( n==null )
|
|
155 return parser.failure(null);
|
|
156 n = Luan.asLong(n);
|
|
157 if( n==null )
|
|
158 return parser.failure(null);
|
|
159 return n;
|
|
160 } else {
|
|
161 Number n = untypedNumber();
|
|
162 if( n != null )
|
|
163 return parser.success(n);
|
|
164 else
|
|
165 return parser.failure(null);
|
|
166 }
|
|
167 }
|
|
168
|
|
169 private Number inParens() {
|
|
170 spaces();
|
|
171 if( !parser.match('(') )
|
|
172 return null;
|
|
173 spaces();
|
|
174 Number n = untypedNumber();
|
|
175 if( n==null )
|
|
176 return null;
|
|
177 spaces();
|
|
178 if( !parser.match(')') )
|
|
179 return null;
|
|
180 return n;
|
|
181 }
|
|
182
|
|
183 private Number untypedNumber() {
|
|
184 int start = parser.begin();
|
|
185 boolean isFloat = false;
|
|
186 parser.match('-');
|
|
187 if( !parser.match('0') ) {
|
|
188 if( !parser.inCharRange('1','9') )
|
|
189 return parser.failure(null);
|
|
190 while( parser.inCharRange('0','9') );
|
|
191 }
|
|
192 if( parser.match('.') ) {
|
|
193 if( !parser.inCharRange('0','9') )
|
|
194 return parser.failure(null);
|
|
195 while( parser.inCharRange('0','9') );
|
|
196 isFloat = true;
|
|
197 }
|
|
198 if( parser.anyOf("eE") ) {
|
|
199 parser.anyOf("+-");
|
|
200 if( !parser.inCharRange('0','9') )
|
|
201 return parser.failure(null);
|
|
202 while( parser.inCharRange('0','9') );
|
|
203 isFloat = true;
|
|
204 }
|
|
205 String s = parser.textFrom(start);
|
|
206 Number n;
|
|
207 if(isFloat)
|
|
208 n = Double.valueOf(s);
|
|
209 else
|
|
210 n = Long.valueOf(s);
|
|
211 return parser.success(n);
|
|
212 }
|
|
213
|
|
214 private LuanTable table() throws ParseException {
|
|
215 parser.begin();
|
|
216 if( !parser.match('{') )
|
|
217 return parser.failure(null);
|
1562
|
218 LuanTable tbl = new LuanTable();
|
1447
|
219 do {
|
|
220 spaces();
|
|
221 Object obj = value();
|
|
222 if( obj != null ) {
|
|
223 if( obj != NULL )
|
|
224 tbl.rawAdd(obj);
|
|
225 spaces();
|
|
226 continue;
|
|
227 }
|
|
228 Object key = key();
|
|
229 if( key != null ) {
|
|
230 spaces();
|
|
231 requiredMatch('=');
|
|
232 spaces();
|
|
233 Object value = requiredValue();
|
|
234 spaces();
|
|
235 try {
|
|
236 tbl.rawPut(key,value);
|
|
237 } catch(LuanException e) {
|
|
238 throw new RuntimeException(e);
|
|
239 }
|
|
240 }
|
|
241 } while( fieldSep() );
|
|
242 requiredMatch('}');
|
|
243 return parser.success(tbl);
|
|
244 }
|
|
245
|
|
246 private Object key() throws ParseException {
|
|
247 if( parser.match('[') ) {
|
|
248 spaces();
|
|
249 Object key = requiredValue();
|
|
250 spaces();
|
|
251 requiredMatch(']');
|
|
252 return key;
|
|
253 }
|
|
254 int start = parser.currentIndex();
|
|
255 if( nameFirstChar() ) {
|
|
256 while( nameChar() );
|
|
257 return parser.textFrom(start);
|
|
258 }
|
|
259 return null;
|
|
260 }
|
|
261
|
|
262 private boolean nameChar() {
|
|
263 return nameFirstChar() || parser.inCharRange('0','9');
|
|
264 }
|
|
265
|
|
266 private boolean nameFirstChar() {
|
|
267 return parser.inCharRange('a','z') || parser.inCharRange('A','Z') || parser.match('_');
|
|
268 }
|
|
269
|
|
270 private boolean fieldSep() throws ParseException {
|
|
271 return parser.anyOf(",;") || endOfLine();
|
|
272 }
|
|
273
|
|
274 private boolean endOfLine() {
|
|
275 return parser.match( "\r\n" ) || parser.match( '\r' ) || parser.match( '\n' );
|
|
276 }
|
|
277
|
|
278 private void requiredMatch(char c) throws ParseException {
|
|
279 if( !parser.match(c) )
|
|
280 throw exception("'"+c+"' expected");
|
|
281 }
|
|
282
|
|
283 private void spaces() {
|
|
284 while( parser.anyOf(" \t") );
|
|
285 }
|
|
286
|
|
287 }
|