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Diffstat (limited to 'scintilla/lexers/LexDiff.cxx')
| -rw-r--r-- | scintilla/lexers/LexDiff.cxx | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/scintilla/lexers/LexDiff.cxx b/scintilla/lexers/LexDiff.cxx new file mode 100644 index 0000000..baa8368 --- /dev/null +++ b/scintilla/lexers/LexDiff.cxx @@ -0,0 +1,153 @@ +// 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 "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" + +#ifdef SCI_NAMESPACE +using namespace Scintilla; +#endif + +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 + styler.ColourTo(endLine, SCE_DIFF_HEADER); + } 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 (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 { + 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); |