165 lines
6.3 KiB
C++
165 lines
6.3 KiB
C++
// Scintilla source code edit control
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/** @file LexDiff.cxx
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** Lexer for diff results.
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**/
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// Copyright 1998-2001 by Neil Hodgson <neilh@scintilla.org>
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// The License.txt file describes the conditions under which this software may be distributed.
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <assert.h>
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#include <ctype.h>
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#include <string>
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#include <string_view>
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#include "ILexer.h"
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#include "Scintilla.h"
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#include "SciLexer.h"
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#include "WordList.h"
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#include "LexAccessor.h"
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#include "Accessor.h"
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#include "StyleContext.h"
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#include "CharacterSet.h"
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#include "LexerModule.h"
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using namespace Lexilla;
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static inline bool AtEOL(Accessor &styler, Sci_PositionU i) {
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return (styler[i] == '\n') ||
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((styler[i] == '\r') && (styler.SafeGetCharAt(i + 1) != '\n'));
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}
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#define DIFF_BUFFER_START_SIZE 16
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// Note that ColouriseDiffLine analyzes only the first DIFF_BUFFER_START_SIZE
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// characters of each line to classify the line.
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static void ColouriseDiffLine(char *lineBuffer, Sci_Position endLine, Accessor &styler) {
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// It is needed to remember the current state to recognize starting
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// comment lines before the first "diff " or "--- ". If a real
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// difference starts then each line starting with ' ' is a whitespace
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// otherwise it is considered a comment (Only in..., Binary file...)
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if (0 == strncmp(lineBuffer, "diff ", 5)) {
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styler.ColourTo(endLine, SCE_DIFF_COMMAND);
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} else if (0 == strncmp(lineBuffer, "Index: ", 7)) { // For subversion's diff
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styler.ColourTo(endLine, SCE_DIFF_COMMAND);
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} else if (0 == strncmp(lineBuffer, "---", 3) && lineBuffer[3] != '-') {
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// In a context diff, --- appears in both the header and the position markers
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if (lineBuffer[3] == ' ' && atoi(lineBuffer + 4) && !strchr(lineBuffer, '/'))
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styler.ColourTo(endLine, SCE_DIFF_POSITION);
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else if (lineBuffer[3] == '\r' || lineBuffer[3] == '\n')
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styler.ColourTo(endLine, SCE_DIFF_POSITION);
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else if (lineBuffer[3] == ' ')
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styler.ColourTo(endLine, SCE_DIFF_HEADER);
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else
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styler.ColourTo(endLine, SCE_DIFF_DELETED);
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} else if (0 == strncmp(lineBuffer, "+++ ", 4)) {
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// I don't know of any diff where "+++ " is a position marker, but for
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// consistency, do the same as with "--- " and "*** ".
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if (atoi(lineBuffer+4) && !strchr(lineBuffer, '/'))
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styler.ColourTo(endLine, SCE_DIFF_POSITION);
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else
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styler.ColourTo(endLine, SCE_DIFF_HEADER);
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} else if (0 == strncmp(lineBuffer, "====", 4)) { // For p4's diff
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styler.ColourTo(endLine, SCE_DIFF_HEADER);
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} else if (0 == strncmp(lineBuffer, "***", 3)) {
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// In a context diff, *** appears in both the header and the position markers.
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// Also ******** is a chunk header, but here it's treated as part of the
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// position marker since there is no separate style for a chunk header.
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if (lineBuffer[3] == ' ' && atoi(lineBuffer+4) && !strchr(lineBuffer, '/'))
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styler.ColourTo(endLine, SCE_DIFF_POSITION);
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else if (lineBuffer[3] == '*')
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styler.ColourTo(endLine, SCE_DIFF_POSITION);
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else
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styler.ColourTo(endLine, SCE_DIFF_HEADER);
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} else if (0 == strncmp(lineBuffer, "? ", 2)) { // For difflib
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styler.ColourTo(endLine, SCE_DIFF_HEADER);
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} else if (lineBuffer[0] == '@') {
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styler.ColourTo(endLine, SCE_DIFF_POSITION);
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} else if (lineBuffer[0] >= '0' && lineBuffer[0] <= '9') {
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styler.ColourTo(endLine, SCE_DIFF_POSITION);
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} else if (0 == strncmp(lineBuffer, "++", 2)) {
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styler.ColourTo(endLine, SCE_DIFF_PATCH_ADD);
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} else if (0 == strncmp(lineBuffer, "+-", 2)) {
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styler.ColourTo(endLine, SCE_DIFF_PATCH_DELETE);
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} else if (0 == strncmp(lineBuffer, "-+", 2)) {
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styler.ColourTo(endLine, SCE_DIFF_REMOVED_PATCH_ADD);
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} else if (0 == strncmp(lineBuffer, "--", 2)) {
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styler.ColourTo(endLine, SCE_DIFF_REMOVED_PATCH_DELETE);
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} else if (lineBuffer[0] == '-' || lineBuffer[0] == '<') {
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styler.ColourTo(endLine, SCE_DIFF_DELETED);
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} else if (lineBuffer[0] == '+' || lineBuffer[0] == '>') {
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styler.ColourTo(endLine, SCE_DIFF_ADDED);
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} else if (lineBuffer[0] == '!') {
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styler.ColourTo(endLine, SCE_DIFF_CHANGED);
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} else if (lineBuffer[0] != ' ') {
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styler.ColourTo(endLine, SCE_DIFF_COMMENT);
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} else {
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styler.ColourTo(endLine, SCE_DIFF_DEFAULT);
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}
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}
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static void ColouriseDiffDoc(Sci_PositionU startPos, Sci_Position length, int, WordList *[], Accessor &styler) {
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char lineBuffer[DIFF_BUFFER_START_SIZE] = "";
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styler.StartAt(startPos);
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styler.StartSegment(startPos);
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Sci_PositionU linePos = 0;
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for (Sci_PositionU i = startPos; i < startPos + length; i++) {
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if (AtEOL(styler, i)) {
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if (linePos < DIFF_BUFFER_START_SIZE) {
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lineBuffer[linePos] = 0;
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}
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ColouriseDiffLine(lineBuffer, i, styler);
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linePos = 0;
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} else if (linePos < DIFF_BUFFER_START_SIZE - 1) {
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lineBuffer[linePos++] = styler[i];
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} else if (linePos == DIFF_BUFFER_START_SIZE - 1) {
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lineBuffer[linePos++] = 0;
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}
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}
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if (linePos > 0) { // Last line does not have ending characters
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if (linePos < DIFF_BUFFER_START_SIZE) {
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lineBuffer[linePos] = 0;
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}
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ColouriseDiffLine(lineBuffer, startPos + length - 1, styler);
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}
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}
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static void FoldDiffDoc(Sci_PositionU startPos, Sci_Position length, int, WordList *[], Accessor &styler) {
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Sci_Position curLine = styler.GetLine(startPos);
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Sci_Position curLineStart = styler.LineStart(curLine);
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int prevLevel = curLine > 0 ? styler.LevelAt(curLine - 1) : SC_FOLDLEVELBASE;
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int nextLevel;
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do {
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const int lineType = styler.StyleAt(curLineStart);
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if (lineType == SCE_DIFF_COMMAND)
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nextLevel = SC_FOLDLEVELBASE | SC_FOLDLEVELHEADERFLAG;
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else if (lineType == SCE_DIFF_HEADER)
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nextLevel = (SC_FOLDLEVELBASE + 1) | SC_FOLDLEVELHEADERFLAG;
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else if (lineType == SCE_DIFF_POSITION && styler[curLineStart] != '-')
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nextLevel = (SC_FOLDLEVELBASE + 2) | SC_FOLDLEVELHEADERFLAG;
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else if (prevLevel & SC_FOLDLEVELHEADERFLAG)
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nextLevel = (prevLevel & SC_FOLDLEVELNUMBERMASK) + 1;
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else
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nextLevel = prevLevel;
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if ((nextLevel & SC_FOLDLEVELHEADERFLAG) && (nextLevel == prevLevel))
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styler.SetLevel(curLine-1, prevLevel & ~SC_FOLDLEVELHEADERFLAG);
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styler.SetLevel(curLine, nextLevel);
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prevLevel = nextLevel;
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curLineStart = styler.LineStart(++curLine);
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} while (static_cast<Sci_Position>(startPos)+length > curLineStart);
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}
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static const char *const emptyWordListDesc[] = {
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0
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};
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LexerModule lmDiff(SCLEX_DIFF, ColouriseDiffDoc, "diff", FoldDiffDoc, emptyWordListDesc);
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