PythonSyntaxHighlighter.cc 7.2 KB
Newer Older
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
/*
This is a C++ port of the following PyQt example
http://diotavelli.net/PyQtWiki/Python%20syntax%20highlighting
C++ port by Frankie Simon (www.kickdrive.de, www.fuh-edv.de)

The following free software license applies for this file ("X11 license"):

Permission is hereby granted, free of charge, to any person obtaining a copy of this software
and associated documentation files (the "Software"), to deal in the Software without restriction,
including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial
portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

#include "PythonSyntaxHighlighter.hh"

PythonSyntaxHighlighter::PythonSyntaxHighlighter(QTextDocument *parent)
 : QSyntaxHighlighter(parent)
{
 keywords = QStringList() << "and" << "assert" << "break" << "class" << "continue" << "def" <<
        "del" << "elif" << "else" << "except" << "exec" << "finally" <<
        "for" << "from" << "global" << "if" << "import" << "in" <<
        "is" << "lambda" << "not" << "or" << "pass" << "print" <<
        "raise" << "return" << "try" << "while" << "yield" <<
        "None" << "True" << "False";

 operators = QStringList() << "=" <<
        // Comparison
        "==" << "!=" << "<" << "<=" << ">" << ">=" <<
        // Arithmetic
        "\\+" << "-" << "\\*" << "/" << "//" << "%" << "\\*\\*" <<
        // In-place
        "\\+=" << "-=" << "\\*=" << "/=" << "%=" <<
        // Bitwise
        "\\^" << "\\|" << "&" << "~" << ">>" << "<<";

 braces = QStringList() << "{" << "}" << "\\(" << "\\)" << "\\[" << "]";

 basicStyles.insert("keyword", getTextCharFormat("blue"));
 basicStyles.insert("operator", getTextCharFormat("red"));
 basicStyles.insert("brace", getTextCharFormat("darkGray"));
    basicStyles.insert("defclass", getTextCharFormat("black", "bold"));
 basicStyles.insert("brace", getTextCharFormat("darkGray"));
 basicStyles.insert("string", getTextCharFormat("magenta"));
 basicStyles.insert("string2", getTextCharFormat("darkMagenta"));
 basicStyles.insert("comment", getTextCharFormat("darkGreen", "italic"));
 basicStyles.insert("self", getTextCharFormat("black", "italic"));
 basicStyles.insert("numbers", getTextCharFormat("brown"));

 triSingleQuote.setPattern("'''");
 triDoubleQuote.setPattern("\"\"\"");

 initializeRules();
}

void PythonSyntaxHighlighter::initializeRules()
{
 foreach (QString currKeyword, keywords)
 {
  rules.append(HighlightingRule(QString("\\b%1\\b").arg(currKeyword), 0, basicStyles.value("keyword")));
 }
 foreach (QString currOperator, operators)
 {
  rules.append(HighlightingRule(QString("%1").arg(currOperator), 0, basicStyles.value("operator")));
 }
 foreach (QString currBrace, braces)
 {
  rules.append(HighlightingRule(QString("%1").arg(currBrace), 0, basicStyles.value("brace")));
 }
 // 'self'
    rules.append(HighlightingRule("\\bself\\b", 0, basicStyles.value("self")));

    // Double-quoted string, possibly containing escape sequences
 // FF: originally in python : r'"[^"\\]*(\\.[^"\\]*)*"'
    rules.append(HighlightingRule("\"[^\"\\\\]*(\\\\.[^\"\\\\]*)*\"", 0, basicStyles.value("string")));
    // Single-quoted string, possibly containing escape sequences
 // FF: originally in python : r"'[^'\\]*(\\.[^'\\]*)*'"
 rules.append(HighlightingRule("'[^'\\\\]*(\\\\.[^'\\\\]*)*'", 0, basicStyles.value("string")));

    // 'def' followed by an identifier
 // FF: originally: r'\bdef\b\s*(\w+)'
    rules.append(HighlightingRule("\\bdef\\b\\s*(\\w+)", 1, basicStyles.value("defclass")));
    //  'class' followed by an identifier
 // FF: originally: r'\bclass\b\s*(\w+)'
 rules.append(HighlightingRule("\\bclass\\b\\s*(\\w+)", 1, basicStyles.value("defclass")));

    // From '#' until a newline
 // FF: originally: r'#[^\\n]*'
    rules.append(HighlightingRule("#[^\\n]*", 0, basicStyles.value("comment")));

    // Numeric literals
    rules.append(HighlightingRule("\\b[+-]?[0-9]+[lL]?\\b", 0, basicStyles.value("numbers"))); // r'\b[+-]?[0-9]+[lL]?\b'
    rules.append(HighlightingRule("\\b[+-]?0[xX][0-9A-Fa-f]+[lL]?\\b", 0, basicStyles.value("numbers"))); // r'\b[+-]?0[xX][0-9A-Fa-f]+[lL]?\b'
    rules.append(HighlightingRule("\\b[+-]?[0-9]+(?:\\.[0-9]+)?(?:[eE][+-]?[0-9]+)?\\b", 0, basicStyles.value("numbers"))); // r'\b[+-]?[0-9]+(?:\.[0-9]+)?(?:[eE][+-]?[0-9]+)?\b'
}

void PythonSyntaxHighlighter::highlightBlock(const QString &text)
{
 foreach (HighlightingRule currRule, rules)
 {
  int idx = currRule.pattern.indexIn(text, 0);
  while (idx >= 0)
  {
   // Get index of Nth match
   idx = currRule.pattern.pos(currRule.nth);
   int length = currRule.pattern.cap(currRule.nth).length();
   setFormat(idx, length, currRule.format);
   idx = currRule.pattern.indexIn(text, idx + length);
  }
 }

 setCurrentBlockState(0);

    // Do multi-line strings
    bool isInMultilne = matchMultiline(text, triSingleQuote, 1, basicStyles.value("string2"));
    if (!isInMultilne)
  isInMultilne = matchMultiline(text, triDoubleQuote, 2, basicStyles.value("string2"));
}

bool PythonSyntaxHighlighter::matchMultiline(const QString &text, const QRegExp &delimiter, const int inState, const QTextCharFormat &style)
{
Jan Möbius's avatar
Jan Möbius committed
131
 int start = -1;
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
 int add = -1;
 int length = 0;

 // If inside triple-single quotes, start at 0
 if (previousBlockState() == inState) {
        start = 0;
        add = 0;
 }
 // Otherwise, look for the delimiter on this line
 else {
        start = delimiter.indexIn(text);
        // Move past this match
        add = delimiter.matchedLength();
 }

    // As long as there's a delimiter match on this line...
    while (start >= 0) {
        // Look for the ending delimiter
Jan Möbius's avatar
Jan Möbius committed
150
        int end = delimiter.indexIn(text, start + add);
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
        // Ending delimiter on this line?
        if (end >= add) {
            length = end - start + add + delimiter.matchedLength();
            setCurrentBlockState(0);
  }
        // No; multi-line string
        else {
            setCurrentBlockState(inState);
            length = text.length() - start + add;
  }
        // Apply formatting and look for next
        setFormat(start, length, style);
        start = delimiter.indexIn(text, start + length);
 }
    // Return True if still inside a multi-line string, False otherwise
    if (currentBlockState() == inState)
        return true;
    else
        return false;
}

const QTextCharFormat PythonSyntaxHighlighter::getTextCharFormat(const QString &colorName, const QString &style)
{
 QTextCharFormat charFormat;
 QColor color(colorName);
 charFormat.setForeground(color);
 if (style.contains("bold", Qt::CaseInsensitive))
  charFormat.setFontWeight(QFont::Bold);
 if (style.contains("italic", Qt::CaseInsensitive))
  charFormat.setFontItalic(true);
 return charFormat;
}