1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
/*
* [The "BSD license"]
* Copyright (c) 2010 Terence Parr
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.antlr.codegen;
import org.antlr.analysis.Label;
import org.antlr.tool.AttributeScope;
import org.antlr.tool.Grammar;
import org.antlr.tool.RuleLabelScope;
public class Perl5Target extends Target {
public Perl5Target() {
targetCharValueEscape['$'] = "\\$";
targetCharValueEscape['@'] = "\\@";
targetCharValueEscape['%'] = "\\%";
AttributeScope.tokenScope.addAttribute("self", null);
RuleLabelScope.predefinedLexerRulePropertiesScope.addAttribute("self", null);
}
public String getTargetCharLiteralFromANTLRCharLiteral(final CodeGenerator generator,
final String literal) {
final StringBuffer buf = new StringBuffer(10);
final int c = Grammar.getCharValueFromGrammarCharLiteral(literal);
if (c < Label.MIN_CHAR_VALUE) {
buf.append("\\x{0000}");
} else if (c < targetCharValueEscape.length &&
targetCharValueEscape[c] != null) {
buf.append(targetCharValueEscape[c]);
} else if (Character.UnicodeBlock.of((char) c) ==
Character.UnicodeBlock.BASIC_LATIN &&
!Character.isISOControl((char) c)) {
// normal char
buf.append((char) c);
} else {
// must be something unprintable...use \\uXXXX
// turn on the bit above max "\\uFFFF" value so that we pad with zeros
// then only take last 4 digits
String hex = Integer.toHexString(c | 0x10000).toUpperCase().substring(1, 5);
buf.append("\\x{");
buf.append(hex);
buf.append("}");
}
if (buf.indexOf("\\") == -1) {
// no need for interpolation, use single quotes
buf.insert(0, '\'');
buf.append('\'');
} else {
// need string interpolation
buf.insert(0, '\"');
buf.append('\"');
}
return buf.toString();
}
public String encodeIntAsCharEscape(final int v) {
final int intValue;
if ((v & 0x8000) == 0) {
intValue = v;
} else {
intValue = -(0x10000 - v);
}
return String.valueOf(intValue);
}
}
|
