1 files changed, 153 insertions, 0 deletions
diff --git a/lexers/LexDiff.cxx b/lexers/LexDiff.cxx
new file mode 100644
index 000000000..46e45263a
--- /dev/null
+++ b/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, unsigned int 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, int 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(unsigned int startPos, int length, int, WordList *[], Accessor &styler) {
+	char lineBuffer[DIFF_BUFFER_START_SIZE] = "";
+	styler.StartAt(startPos);
+	styler.StartSegment(startPos);
+	unsigned int linePos = 0;
+	for (unsigned int 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(unsigned int startPos, int length, int, WordList *[], Accessor &styler) {
+	int curLine = styler.GetLine(startPos);
+	int 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<int>(startPos) + length > curLineStart);
+}
+
+static const char *const emptyWordListDesc[] = {
+	0
+};
+
+LexerModule lmDiff(SCLEX_DIFF, ColouriseDiffDoc, "diff", FoldDiffDoc, emptyWordListDesc);