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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0+ OR GPL-3.0 WITH Qt-GPL-exception-1.0
/**
* @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 "pythonscanner.h"
#include <texteditor/textdocument.h>
#include <texteditor/textdocumentlayout.h>
#include <texteditor/texteditorconstants.h>
#include <utils/qtcassert.h>
namespace Python {
namespace Internal {
/**
* @class PythonEditor::Internal::PythonHighlighter
* @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
*/
static TextEditor::TextStyle styleForFormat(int format)
{
using namespace TextEditor;
const auto f = Format(format);
switch (f) {
case Format_Number: return C_NUMBER;
case Format_String: return C_STRING;
case Format_Keyword: return C_KEYWORD;
case Format_Type: return C_TYPE;
case Format_ClassField: return C_FIELD;
case Format_MagicAttr: return C_JS_SCOPE_VAR;
case Format_Operator: return C_OPERATOR;
case Format_Comment: return C_COMMENT;
case Format_Doxygen: return C_DOXYGEN_COMMENT;
case Format_Identifier: return C_TEXT;
case Format_Whitespace: return C_VISUAL_WHITESPACE;
case Format_ImportedModule: return C_STRING;
case Format_LParen: return C_OPERATOR;
case Format_RParen: return C_OPERATOR;
case Format_FormatsAmount:
QTC_CHECK(false); // should never get here
return C_TEXT;
}
QTC_CHECK(false); // should never get here
return C_TEXT;
}
PythonHighlighter::PythonHighlighter()
{
setTextFormatCategories(Format_FormatsAmount, styleForFormat);
}
/**
* @brief PythonHighlighter::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() function.
*
* This function 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 bool isImportKeyword(const QString &keyword)
{
return keyword == "import" || keyword == "from";
}
static int indent(const QString &line)
{
for (int i = 0, size = line.size(); i < size; ++i) {
if (!line.at(i).isSpace())
return i;
}
return -1;
}
static void setFoldingIndent(const QTextBlock &block, int indent)
{
if (TextEditor::TextBlockUserData *userData = TextEditor::TextDocumentLayout::userData(block)) {
userData->setFoldingIndent(indent);
userData->setFoldingStartIncluded(false);
userData->setFoldingEndIncluded(false);
}
}
/**
* @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);
const int pos = indent(text);
if (pos < 0) {
// Empty lines do not change folding indent
setFoldingIndent(currentBlock(), m_lastIndent);
} else {
m_lastIndent = pos;
if (pos == 0 && text.startsWith('#') && !text.startsWith("#!")) {
// A comment block at indentation 0. Fold on first line.
setFoldingIndent(currentBlock(), withinLicenseHeader ? 1 : 0);
withinLicenseHeader = true;
} else {
// Normal Python code. Line indentation can be used as folding indent.
setFoldingIndent(currentBlock(), m_lastIndent);
withinLicenseHeader = false;
}
}
FormatToken tk;
TextEditor::Parentheses parentheses;
bool hasOnlyWhitespace = true;
while (!(tk = scanner.read()).isEndOfBlock()) {
Format format = tk.format();
if (format == Format_Keyword && isImportKeyword(scanner.value(tk)) && hasOnlyWhitespace) {
setFormat(tk.begin(), tk.length(), formatForCategory(format));
highlightImport(scanner);
} else if (format == Format_Comment
|| format == Format_String
|| format == Format_Doxygen) {
setFormatWithSpaces(text, tk.begin(), tk.length(), formatForCategory(format));
} else {
if (format == Format_LParen) {
parentheses.append(TextEditor::Parenthesis(TextEditor::Parenthesis::Opened,
text.at(tk.begin()), tk.begin()));
} else if (format == Format_RParen) {
parentheses.append(TextEditor::Parenthesis(TextEditor::Parenthesis::Closed,
text.at(tk.begin()), tk.begin()));
}
setFormat(tk.begin(), tk.length(), formatForCategory(format));
}
if (format != Format_Whitespace)
hasOnlyWhitespace = false;
}
TextEditor::TextDocumentLayout::setParentheses(currentBlock(), parentheses);
return scanner.state();
}
/**
* @brief Highlights rest of line as import directive
*/
void PythonHighlighter::highlightImport(Scanner &scanner)
{
FormatToken tk;
while (!(tk = scanner.read()).isEndOfBlock()) {
Format format = tk.format();
if (tk.format() == Format_Identifier)
format = Format_ImportedModule;
setFormat(tk.begin(), tk.length(), formatForCategory(format));
}
}
} // namespace Internal
} // namespace Python
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