1 /*
2 * Copyright (c) 2009 QOS.ch All rights reserved.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a copy
5 * of this software and associated documentation files (the "Software"), to deal
6 * in the Software without restriction, including without limitation the rights
7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8 * copies of the Software, and to permit persons to whom the Software is
9 * furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20 * SOFTWARE.
21 */
22 package ch.qos.cal10n.util;
23
24 import java.io.Reader;
25 import java.util.List;
26 import java.util.Map;
27
28
29 /**
30 *
31 * @author Ceki Gülcü
32 *
33 */
34 import ch.qos.cal10n.util.Token.TokenType;
35
36 // Given tokens k,s,v, \, and EOL
37 // ^ denoting the null token
38 // here is the grammar
39
40 // E = EOL | k s V | E | ^
41 // V = v EOL | v '\' Vopt
42 // Vopt = EOL V
43
44 public class Parser {
45
46 final Reader reader;
47 final Map<String, String> map;
48
49 List<Token> tokenList;
50 int pointer = 0;
51
52 Parser(Reader r, Map<String, String> map) {
53 this.reader = r;
54 this.map = map;
55 TokenStream ts = new TokenStream(reader);
56 tokenList = ts.tokenize();
57 }
58
59 void parseAndPopulate() {
60 E();
61 }
62
63 private void E() {
64 Token t = getNextToken();
65 if (t == null) {
66 // we are done
67 return;
68 }
69 switch (t.tokenType) {
70 case EOL:
71 break;
72 case KEY:
73 String k = t.getValue();
74 t = getNextToken();
75 if (t.tokenType != TokenType.SEPARATOR) {
76 throw new IllegalStateException("Unexpected token " + t);
77 }
78 StringBuilder buf = new StringBuilder();
79 V(buf);
80 map.put(k, buf.toString());
81 break;
82 }
83 E();
84 }
85
86 // V = v EOL | v '\' Vopt
87 // Vopt = EOL V
88 private void V(StringBuilder buf) {
89
90 Token t = getNextToken();
91 if (t.tokenType != TokenType.VALUE) {
92 throw new IllegalStateException("Unexpected token " + t);
93 }
94 buf.append(t.getValue());
95
96 t = getNextToken();
97 if (t.tokenType == TokenType.EOL) {
98 return;
99 } else if (t.tokenType == TokenType.TRAILING_BACKSLASH) {
100 Vopt(buf);
101
102 }
103 }
104
105 private void Vopt(StringBuilder buf) {
106 Token t = getNextToken();
107 if (t.tokenType != TokenType.EOL) {
108 throw new IllegalStateException("Unexpected token " + t);
109 }
110 V(buf);
111 }
112
113 private Token getNextToken() {
114 if (pointer < tokenList.size()) {
115 return (Token) tokenList.get(pointer++);
116 }
117 return null;
118 }
119
120 // private Token getCurentToken() {
121 // if (pointer < tokenList.size()) {
122 // return (Token) tokenList.get(pointer);
123 // }
124 // return null;
125 // }
126 //
127 // private void advanceTokenPointer() {
128 // pointer++;
129 // }
130 }