notepad-plus-plus/lexilla/lexers/LexDiff.cxx

165 lines
6.3 KiB
C++

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