1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
|
// Scintilla source code edit control
/** @file LexAccessor.h
** Interfaces between Scintilla and lexers.
**/
// Copyright 1998-2010 by Neil Hodgson <neilh@scintilla.org>
// The License.txt file describes the conditions under which this software may be distributed.
#ifndef LEXACCESSOR_H
#define LEXACCESSOR_H
#ifdef SCI_NAMESPACE
namespace Scintilla {
#endif
enum EncodingType { enc8bit, encUnicode, encDBCS };
class LexAccessor {
private:
IDocument *pAccess;
enum {extremePosition=0x7FFFFFFF};
/** @a bufferSize is a trade off between time taken to copy the characters
* and retrieval overhead.
* @a slopSize positions the buffer before the desired position
* in case there is some backtracking. */
enum {bufferSize=4000, slopSize=bufferSize/8};
char buf[bufferSize+1];
int startPos;
int endPos;
int codePage;
enum EncodingType encodingType;
int lenDoc;
char styleBuf[bufferSize];
int validLen;
unsigned int startSeg;
int startPosStyling;
int documentVersion;
void Fill(int position) {
startPos = position - slopSize;
if (startPos + bufferSize > lenDoc)
startPos = lenDoc - bufferSize;
if (startPos < 0)
startPos = 0;
endPos = startPos + bufferSize;
if (endPos > lenDoc)
endPos = lenDoc;
pAccess->GetCharRange(buf, startPos, endPos-startPos);
buf[endPos-startPos] = '\0';
}
public:
explicit LexAccessor(IDocument *pAccess_) :
pAccess(pAccess_), startPos(extremePosition), endPos(0),
codePage(pAccess->CodePage()),
encodingType(enc8bit),
lenDoc(pAccess->Length()),
validLen(0),
startSeg(0), startPosStyling(0),
documentVersion(pAccess->Version()) {
// Prevent warnings by static analyzers about uninitialized buf and styleBuf.
buf[0] = 0;
styleBuf[0] = 0;
switch (codePage) {
case 65001:
encodingType = encUnicode;
break;
case 932:
case 936:
case 949:
case 950:
case 1361:
encodingType = encDBCS;
}
}
char operator[](int position) {
if (position < startPos || position >= endPos) {
Fill(position);
}
return buf[position - startPos];
}
IDocumentWithLineEnd *MultiByteAccess() const {
if (documentVersion >= dvLineEnd) {
return static_cast<IDocumentWithLineEnd *>(pAccess);
}
return 0;
}
/** Safe version of operator[], returning a defined value for invalid position. */
char SafeGetCharAt(int position, char chDefault=' ') {
if (position < startPos || position >= endPos) {
Fill(position);
if (position < startPos || position >= endPos) {
// Position is outside range of document
return chDefault;
}
}
return buf[position - startPos];
}
bool IsLeadByte(char ch) const {
return pAccess->IsDBCSLeadByte(ch);
}
EncodingType Encoding() const {
return encodingType;
}
bool Match(int pos, const char *s) {
for (int i=0; *s; i++) {
if (*s != SafeGetCharAt(pos+i))
return false;
s++;
}
return true;
}
char StyleAt(int position) const {
return static_cast<char>(pAccess->StyleAt(position));
}
int GetLine(int position) const {
return pAccess->LineFromPosition(position);
}
int LineStart(int line) const {
return pAccess->LineStart(line);
}
int LineEnd(int line) {
if (documentVersion >= dvLineEnd) {
return (static_cast<IDocumentWithLineEnd *>(pAccess))->LineEnd(line);
} else {
// Old interface means only '\r', '\n' and '\r\n' line ends.
int startNext = pAccess->LineStart(line+1);
char chLineEnd = SafeGetCharAt(startNext-1);
if (chLineEnd == '\n' && (SafeGetCharAt(startNext-2) == '\r'))
return startNext - 2;
else
return startNext - 1;
}
}
int LevelAt(int line) const {
return pAccess->GetLevel(line);
}
int Length() const {
return lenDoc;
}
void Flush() {
if (validLen > 0) {
pAccess->SetStyles(validLen, styleBuf);
startPosStyling += validLen;
validLen = 0;
}
}
int GetLineState(int line) const {
return pAccess->GetLineState(line);
}
int SetLineState(int line, int state) {
return pAccess->SetLineState(line, state);
}
// Style setting
void StartAt(unsigned int start) {
pAccess->StartStyling(start, '\377');
startPosStyling = start;
}
unsigned int GetStartSegment() const {
return startSeg;
}
void StartSegment(unsigned int pos) {
startSeg = pos;
}
void ColourTo(unsigned int pos, int chAttr) {
// Only perform styling if non empty range
if (pos != startSeg - 1) {
assert(pos >= startSeg);
if (pos < startSeg) {
return;
}
if (validLen + (pos - startSeg + 1) >= bufferSize)
Flush();
if (validLen + (pos - startSeg + 1) >= bufferSize) {
// Too big for buffer so send directly
pAccess->SetStyleFor(pos - startSeg + 1, static_cast<char>(chAttr));
} else {
for (unsigned int i = startSeg; i <= pos; i++) {
assert((startPosStyling + validLen) < Length());
styleBuf[validLen++] = static_cast<char>(chAttr);
}
}
}
startSeg = pos+1;
}
void SetLevel(int line, int level) {
pAccess->SetLevel(line, level);
}
void IndicatorFill(int start, int end, int indicator, int value) {
pAccess->DecorationSetCurrentIndicator(indicator);
pAccess->DecorationFillRange(start, value, end - start);
}
void ChangeLexerState(int start, int end) {
pAccess->ChangeLexerState(start, end);
}
};
#ifdef SCI_NAMESPACE
}
#endif
#endif
|
