1 // Scintilla source code edit control
2 /** @file LexDiff.cxx
3 ** Lexer for diff results.
4 **/
5 // Copyright 1998-2001 by Neil Hodgson <neilh@scintilla.org>
6 // The License.txt file describes the conditions under which this software may be distributed.
7
8 #include <stdlib.h>
9 #include <string.h>
10 #include <stdio.h>
11 #include <stdarg.h>
12 #include <assert.h>
13 #include <ctype.h>
14
15 #include "ILexer.h"
16 #include "Scintilla.h"
17 #include "SciLexer.h"
18
19 #include "WordList.h"
20 #include "LexAccessor.h"
21 #include "Accessor.h"
22 #include "StyleContext.h"
23 #include "CharacterSet.h"
24 #include "LexerModule.h"
25
26 using namespace Scintilla;
27
AtEOL(Accessor & styler,Sci_PositionU i)28 static inline bool AtEOL(Accessor &styler, Sci_PositionU i) {
29 return (styler[i] == '\n') ||
30 ((styler[i] == '\r') && (styler.SafeGetCharAt(i + 1) != '\n'));
31 }
32
33 #define DIFF_BUFFER_START_SIZE 16
34 // Note that ColouriseDiffLine analyzes only the first DIFF_BUFFER_START_SIZE
35 // characters of each line to classify the line.
36
ColouriseDiffLine(char * lineBuffer,Sci_Position endLine,Accessor & styler)37 static void ColouriseDiffLine(char *lineBuffer, Sci_Position endLine, Accessor &styler) {
38 // It is needed to remember the current state to recognize starting
39 // comment lines before the first "diff " or "--- ". If a real
40 // difference starts then each line starting with ' ' is a whitespace
41 // otherwise it is considered a comment (Only in..., Binary file...)
42 if (0 == strncmp(lineBuffer, "diff ", 5)) {
43 styler.ColourTo(endLine, SCE_DIFF_COMMAND);
44 } else if (0 == strncmp(lineBuffer, "Index: ", 7)) { // For subversion's diff
45 styler.ColourTo(endLine, SCE_DIFF_COMMAND);
46 } else if (0 == strncmp(lineBuffer, "---", 3) && lineBuffer[3] != '-') {
47 // In a context diff, --- appears in both the header and the position markers
48 if (lineBuffer[3] == ' ' && atoi(lineBuffer + 4) && !strchr(lineBuffer, '/'))
49 styler.ColourTo(endLine, SCE_DIFF_POSITION);
50 else if (lineBuffer[3] == '\r' || lineBuffer[3] == '\n')
51 styler.ColourTo(endLine, SCE_DIFF_POSITION);
52 else if (lineBuffer[3] == ' ')
53 styler.ColourTo(endLine, SCE_DIFF_HEADER);
54 else
55 styler.ColourTo(endLine, SCE_DIFF_DELETED);
56 } else if (0 == strncmp(lineBuffer, "+++ ", 4)) {
57 // I don't know of any diff where "+++ " is a position marker, but for
58 // consistency, do the same as with "--- " and "*** ".
59 if (atoi(lineBuffer+4) && !strchr(lineBuffer, '/'))
60 styler.ColourTo(endLine, SCE_DIFF_POSITION);
61 else
62 styler.ColourTo(endLine, SCE_DIFF_HEADER);
63 } else if (0 == strncmp(lineBuffer, "====", 4)) { // For p4's diff
64 styler.ColourTo(endLine, SCE_DIFF_HEADER);
65 } else if (0 == strncmp(lineBuffer, "***", 3)) {
66 // In a context diff, *** appears in both the header and the position markers.
67 // Also ******** is a chunk header, but here it's treated as part of the
68 // position marker since there is no separate style for a chunk header.
69 if (lineBuffer[3] == ' ' && atoi(lineBuffer+4) && !strchr(lineBuffer, '/'))
70 styler.ColourTo(endLine, SCE_DIFF_POSITION);
71 else if (lineBuffer[3] == '*')
72 styler.ColourTo(endLine, SCE_DIFF_POSITION);
73 else
74 styler.ColourTo(endLine, SCE_DIFF_HEADER);
75 } else if (0 == strncmp(lineBuffer, "? ", 2)) { // For difflib
76 styler.ColourTo(endLine, SCE_DIFF_HEADER);
77 } else if (lineBuffer[0] == '@') {
78 styler.ColourTo(endLine, SCE_DIFF_POSITION);
79 } else if (lineBuffer[0] >= '0' && lineBuffer[0] <= '9') {
80 styler.ColourTo(endLine, SCE_DIFF_POSITION);
81 } else if (0 == strncmp(lineBuffer, "++", 2)) {
82 styler.ColourTo(endLine, SCE_DIFF_PATCH_ADD);
83 } else if (0 == strncmp(lineBuffer, "+-", 2)) {
84 styler.ColourTo(endLine, SCE_DIFF_PATCH_DELETE);
85 } else if (0 == strncmp(lineBuffer, "-+", 2)) {
86 styler.ColourTo(endLine, SCE_DIFF_REMOVED_PATCH_ADD);
87 } else if (0 == strncmp(lineBuffer, "--", 2)) {
88 styler.ColourTo(endLine, SCE_DIFF_REMOVED_PATCH_DELETE);
89 } else if (lineBuffer[0] == '-' || lineBuffer[0] == '<') {
90 styler.ColourTo(endLine, SCE_DIFF_DELETED);
91 } else if (lineBuffer[0] == '+' || lineBuffer[0] == '>') {
92 styler.ColourTo(endLine, SCE_DIFF_ADDED);
93 } else if (lineBuffer[0] == '!') {
94 styler.ColourTo(endLine, SCE_DIFF_CHANGED);
95 } else if (lineBuffer[0] != ' ') {
96 styler.ColourTo(endLine, SCE_DIFF_COMMENT);
97 } else {
98 styler.ColourTo(endLine, SCE_DIFF_DEFAULT);
99 }
100 }
101
ColouriseDiffDoc(Sci_PositionU startPos,Sci_Position length,int,WordList * [],Accessor & styler)102 static void ColouriseDiffDoc(Sci_PositionU startPos, Sci_Position length, int, WordList *[], Accessor &styler) {
103 char lineBuffer[DIFF_BUFFER_START_SIZE] = "";
104 styler.StartAt(startPos);
105 styler.StartSegment(startPos);
106 Sci_PositionU linePos = 0;
107 for (Sci_PositionU i = startPos; i < startPos + length; i++) {
108 if (AtEOL(styler, i)) {
109 if (linePos < DIFF_BUFFER_START_SIZE) {
110 lineBuffer[linePos] = 0;
111 }
112 ColouriseDiffLine(lineBuffer, i, styler);
113 linePos = 0;
114 } else if (linePos < DIFF_BUFFER_START_SIZE - 1) {
115 lineBuffer[linePos++] = styler[i];
116 } else if (linePos == DIFF_BUFFER_START_SIZE - 1) {
117 lineBuffer[linePos++] = 0;
118 }
119 }
120 if (linePos > 0) { // Last line does not have ending characters
121 if (linePos < DIFF_BUFFER_START_SIZE) {
122 lineBuffer[linePos] = 0;
123 }
124 ColouriseDiffLine(lineBuffer, startPos + length - 1, styler);
125 }
126 }
127
FoldDiffDoc(Sci_PositionU startPos,Sci_Position length,int,WordList * [],Accessor & styler)128 static void FoldDiffDoc(Sci_PositionU startPos, Sci_Position length, int, WordList *[], Accessor &styler) {
129 Sci_Position curLine = styler.GetLine(startPos);
130 Sci_Position curLineStart = styler.LineStart(curLine);
131 int prevLevel = curLine > 0 ? styler.LevelAt(curLine - 1) : SC_FOLDLEVELBASE;
132 int nextLevel;
133
134 do {
135 const int lineType = styler.StyleAt(curLineStart);
136 if (lineType == SCE_DIFF_COMMAND)
137 nextLevel = SC_FOLDLEVELBASE | SC_FOLDLEVELHEADERFLAG;
138 else if (lineType == SCE_DIFF_HEADER)
139 nextLevel = (SC_FOLDLEVELBASE + 1) | SC_FOLDLEVELHEADERFLAG;
140 else if (lineType == SCE_DIFF_POSITION && styler[curLineStart] != '-')
141 nextLevel = (SC_FOLDLEVELBASE + 2) | SC_FOLDLEVELHEADERFLAG;
142 else if (prevLevel & SC_FOLDLEVELHEADERFLAG)
143 nextLevel = (prevLevel & SC_FOLDLEVELNUMBERMASK) + 1;
144 else
145 nextLevel = prevLevel;
146
147 if ((nextLevel & SC_FOLDLEVELHEADERFLAG) && (nextLevel == prevLevel))
148 styler.SetLevel(curLine-1, prevLevel & ~SC_FOLDLEVELHEADERFLAG);
149
150 styler.SetLevel(curLine, nextLevel);
151 prevLevel = nextLevel;
152
153 curLineStart = styler.LineStart(++curLine);
154 } while (static_cast<Sci_Position>(startPos)+length > curLineStart);
155 }
156
157 static const char *const emptyWordListDesc[] = {
158 0
159 };
160
161 LexerModule lmDiff(SCLEX_DIFF, ColouriseDiffDoc, "diff", FoldDiffDoc, emptyWordListDesc);
162