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1
52
53 package com.go.trove.io;
54
55 import java.io.*;
56
57
63 public class TagReader extends EscapeReader {
64 private int mTagCount;
65 private int[] mTagStarts;
66 private String  [] mTagEnds;
67 private int[] mCodes;
68
69 private char[] mMinibuf;
70
71 private static int maxLength(String [] tags) {
72 int max = 0;
73
74 for (int i=0; i<tags.length; i++) {
75 if (tags[i].length() > max) {
76 max = tags[i].length();
77 }
78 }
79
80 return max;
81 }
82
83 public TagReader(Reader source, String [] tags, int[] codes) {
84 super(source, maxLength(tags));
85
86 mTagCount = tags.length;
87 mTagStarts = new int[mTagCount];
88 mTagEnds = new String [mTagCount];
89 mCodes = new int[mTagCount];
90
91 for (int i=0; i<mTagCount; i++) {
92 mTagStarts[i] = tags[i].charAt(0);
93 mTagEnds[i] = tags[i].substring(1);
94 mCodes[i] = codes[i];
95 }
96
97 mMinibuf = new char[maxLength(tags)];
98 }
99
100 public int read() throws IOException {
101 int c = mSource.read();
102
103 if (c == -1 || !mEscapesEnabled) {
104 return c;
105 }
106
107 for (int i=0; i<mTagCount; i++) {
108 if (mTagStarts[i] == c) {
109 int length = mTagEnds[i].length();
110
111 mMinibuf[0] = (char)c;
112 int len = mSource.read(mMinibuf, 0, length);
113
114 if (len == length) {
115 if (new String (mMinibuf, 0, length).equals(mTagEnds[i])) {
116 return mCodes[i];
117 }
118 }
119
120 if (len > 0) {
121 mSource.unread(len);
122 }
123 }
124 }
125
126 return c;
127 }
128
129 public static void main(String [] arg) throws Exception {
130 Tester.test(arg);
131 }
132
133 private static class Tester {
134 public static void test(String [] arg) throws Exception {
135 String str = "This <%is a %> % > > % %% >> < % test.\n";
136
137 System.out.println("\nOriginal: " + str);
138
139 System.out.println("\nConverted:\n");
140
141 Reader reader = new StringReader(str);
142
143 TagReader tr = new TagReader
144 (reader, new String [] {"<%", "%>"}, new int[] {-2, -3});
145
146 PositionReader pr = new PositionReader(tr);
147
148 int c;
149 System.out.print(pr.getNextPosition() + "\t");
150 while ( (c = pr.read()) != -1 ) {
151 System.out.println((char)c + "\t" + c);
152 System.out.print(pr.getNextPosition() + "\t");
153 }
154 }
155 }
156 }
157 |
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