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/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of Qt Creator.
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
****************************************************************************/
/**
* @brief The Highlighter class pre-highlights Python source using simple scanner.
*
* Highlighter doesn't highlight user types (classes and enumerations), syntax
* and semantic errors, unnecessary code, etc. It's implements only
* basic highlight mechanism.
*
* Main highlight procedure is highlightBlock().
*/
#include "pythonhighlighter.h"
#include "lexical/pythonscanner.h"
#include <texteditor/basetextdocument.h>
#include <texteditor/texteditorconstants.h>
namespace PythonEditor {
using namespace PythonEditor::Internal;
/**
* @class PyEditor::Highlighter
* @brief Handles incremental lexical highlighting, but not semantic
*
* Incremental lexical highlighting works every time when any character typed
* or some text inserted (i.e. copied & pasted).
* Each line keeps associated scanner state - integer number. This state is the
* scanner context for next line. For example, 3 quotes begin a multiline
* string, and each line up to next 3 quotes has state 'MultiLineString'.
*
* @code
* def __init__: # Normal
* self.__doc__ = """ # MultiLineString (next line is inside)
* banana # MultiLineString
* """ # Normal
* @endcode
*/
PythonHighlighter::PythonHighlighter(QTextDocument *parent) :
TextEditor::SyntaxHighlighter(parent)
{
init();
}
/// New instance created when opening any document in editor
PythonHighlighter::PythonHighlighter(TextEditor::BaseTextDocument *parent) :
TextEditor::SyntaxHighlighter(parent)
{
init();
}
void PythonHighlighter::init()
{
static QVector<TextEditor::TextStyle> categories;
if (categories.isEmpty()) {
categories << TextEditor::C_NUMBER
<< TextEditor::C_STRING
<< TextEditor::C_KEYWORD
<< TextEditor::C_TYPE
<< TextEditor::C_FIELD
<< TextEditor::C_JS_SCOPE_VAR
<< TextEditor::C_OPERATOR
<< TextEditor::C_COMMENT
<< TextEditor::C_DOXYGEN_COMMENT
<< TextEditor::C_TEXT
<< TextEditor::C_VISUAL_WHITESPACE
<< TextEditor::C_STRING;
}
setTextFormatCategories(categories);
}
/// Instance destroyed when one of documents closed from editor
PythonHighlighter::~PythonHighlighter()
{
}
/**
* @brief Highlighter::highlightBlock highlights single line of Python code
* @param text is single line without EOLN symbol. Access to all block data
* can be obtained through inherited currentBlock() method.
*
* This method receives state (int number) from previously highlighted block,
* scans block using received state and sets initial highlighting for current
* block. At the end, it saves internal state in current block.
*/
void PythonHighlighter::highlightBlock(const QString &text)
{
int initialState = previousBlockState();
if (initialState == -1)
initialState = 0;
setCurrentBlockState(highlightLine(text, initialState));
}
/**
* @return True if this keyword is acceptable at start of import line
*/
static inline
bool isImportKeyword(const QString &keyword)
{
return (keyword == QLatin1String("import")
|| keyword == QLatin1String("from"));
}
/**
* @brief Highlight line of code, returns new block state
* @param text Source code to highlight
* @param initialState Initial state of scanner, retrieved from previous block
* @return Final state of scanner, should be saved with current block
*/
int PythonHighlighter::highlightLine(const QString &text, int initialState)
{
Scanner scanner(text.constData(), text.size());
scanner.setState(initialState);
FormatToken tk;
bool hasOnlyWhitespace = true;
while ((tk = scanner.read()).format() != Format_EndOfBlock) {
Format format = tk.format();
if (format == Format_Keyword) {
QString value = scanner.value(tk);
if (isImportKeyword(value) && hasOnlyWhitespace) {
setFormat(tk.begin(), tk.length(), formatForCategory(format));
highlightImport(scanner);
break;
}
}
setFormat(tk.begin(), tk.length(), formatForCategory(format));
if (format != Format_Whitespace)
hasOnlyWhitespace = false;
}
return scanner.state();
}
/**
* @brief Highlights rest of line as import directive
*/
void PythonHighlighter::highlightImport(Scanner &scanner)
{
FormatToken tk;
while ((tk = scanner.read()).format() != Format_EndOfBlock) {
Format format = tk.format();
if (tk.format() == Format_Identifier)
format = Format_ImportedModule;
setFormat(tk.begin(), tk.length(), formatForCategory(format));
}
}
} // namespace PythonEditor
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