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
|
/*
* Copyright 2000-2013 Vaadin Ltd.
*
* Licensed 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.
*/
package com.vaadin.sass.internal.visitor;
import java.util.ArrayList;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.commons.jexl2.Expression;
import org.apache.commons.jexl2.JexlEngine;
import org.apache.commons.jexl2.JexlException;
import org.w3c.flute.parser.ParseException;
import com.vaadin.sass.internal.tree.Node;
import com.vaadin.sass.internal.tree.controldirective.ElseNode;
import com.vaadin.sass.internal.tree.controldirective.IfElseDefNode;
import com.vaadin.sass.internal.tree.controldirective.IfElseNode;
import com.vaadin.sass.internal.tree.controldirective.IfNode;
public class IfElseNodeHandler {
private static final JexlEngine evaluator = new JexlEngine();
private static final Pattern pattern = Pattern
.compile("[a-zA-Z0-9]*[a-zA-Z]+[a-zA-Z0-9]*");
public static void traverse(IfElseDefNode node) throws Exception {
for (final Node child : node.getChildren()) {
if (child instanceof IfNode) {
try {
String expression = ((IfElseNode) child).getExpression();
// We need to add ' ' for strings in the expression for
// jexl to understand that is should do a string
// comparison
expression = replaceStrings(expression);
Expression e = evaluator.createExpression(expression);
try {
Object eval = e.evaluate(null);
Boolean result = false;
if (eval instanceof Boolean) {
result = (Boolean) eval;
} else if (eval instanceof String) {
result = Boolean.valueOf((String) eval);
}
if (result) {
replaceDefNodeWithCorrectChild(node,
node.getParentNode(), child);
break;
}
} catch (ClassCastException ex) {
throw new ParseException(
"Invalid @if/@else in scss file, not a boolean expression : "
+ child.toString());
} catch (NullPointerException ex) {
throw new ParseException(
"Invalid @if/@else in scss file, not a boolean expression : "
+ child.toString());
}
} catch (JexlException e) {
throw new ParseException(
"Invalid @if/@else in scss file for "
+ child.toString());
}
} else {
if (!(child instanceof ElseNode)
&& node.getChildren().indexOf(child) == node
.getChildren().size() - 1) {
throw new ParseException(
"Invalid @if/@else in scss file for " + node);
} else {
replaceDefNodeWithCorrectChild(node, node.getParentNode(),
child);
break;
}
}
}
node.getParentNode().removeChild(node);
}
private static String replaceStrings(String expression) {
expression = expression.replaceAll("\"", "");
Matcher m = pattern.matcher(expression);
StringBuffer b = new StringBuffer();
while (m.find()) {
String group = m.group();
m.appendReplacement(b, "'" + group + "'");
}
m.appendTail(b);
if (b.length() != 0) {
return b.toString();
}
return expression;
}
private static void replaceDefNodeWithCorrectChild(IfElseDefNode defNode,
Node parent, final Node child) {
for (final Node n : new ArrayList<Node>(child.getChildren())) {
parent.appendChild(n, defNode);
}
}
}
|
