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
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
|
package org.apache.velocity.runtime.parser.node;
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
import org.apache.velocity.runtime.parser.Parser;
import org.apache.velocity.runtime.parser.StandardParserConstants;
import org.apache.velocity.runtime.parser.Token;
/**
* Utilities for dealing with the AST node structure.
*
* @author <a href="mailto:jvanzyl@apache.org">Jason van Zyl</a>
* @author <a href="mailto:geirm@optonline.net">Geir Magnusson Jr.</a>
* @version $Id$
*/
public class NodeUtils
{
/**
* Collect all the <SPECIAL_TOKEN>s that
* are carried along with a token. Special
* tokens do not participate in parsing but
* can still trigger certain lexical actions.
* In some cases you may want to retrieve these
* special tokens, this is simply a way to
* extract them.
* @param t the Token
* @return StrBuilder with the special tokens.
* @since 2.0.0
*/
public static StringBuilder getSpecialText(Parser parser, Token t)
{
StringBuilder sb = new StringBuilder();
Token tmp_t = t.specialToken;
while (tmp_t.specialToken != null)
{
tmp_t = tmp_t.specialToken;
}
while (tmp_t != null)
{
String st = tmp_t.image;
for(int i = 0, is = st.length(); i < is; i++)
{
char c = st.charAt(i);
if ( c == parser.hash() || c == parser.dollar() )
{
sb.append( c );
}
/*
* more dreaded MORE hack :)
*
* looking for ("\\")*"$" sequences
*/
if ( c == '\\')
{
boolean ok = true;
boolean term = false;
int j = i;
for( ok = true; ok && j < is; j++)
{
char cc = st.charAt( j );
if (cc == '\\')
{
/*
* if we see a \, keep going
*/
continue;
}
else if( cc == parser.dollar() )
{
/*
* a $ ends it correctly
*/
term = true;
ok = false;
}
else
{
/*
* nah...
*/
ok = false;
}
}
if (term)
{
String foo = st.substring( i, j );
sb.append( foo );
i = j;
}
}
}
tmp_t = tmp_t.next;
}
return sb;
}
/**
* complete node literal
* @param t
* @return A node literal.
*/
public static String tokenLiteral( Parser parser, Token t )
{
// Look at kind of token and return "" when it's a block comment
if (t.kind == StandardParserConstants.MULTI_LINE_COMMENT)
{
return "";
}
else if (t.specialToken == null || t.specialToken.image.startsWith(parser.lineComment()))
{
return t.image;
}
else
{
StringBuilder special = getSpecialText(parser, t);
if (special.length() > 0)
{
return special.append(t.image).toString();
}
return t.image;
}
}
/**
* Fix children indentation in structured space gobbling mode.
* @param parent
* @param parentIndentation
*/
public static void fixIndentation(SimpleNode parent, String parentIndentation)
{
IndentationFixer fixer = new IndentationFixer(parentIndentation);
parent.childrenAccept(fixer, null);
}
}
|
