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// Scintilla source code edit control
/** @file TestDocument.cxx
** Lexer testing.
**/
// Copyright 2019 by Neil Hodgson <neilh@scintilla.org>
// The License.txt file describes the conditions under which this software may be distributed.
#include <cassert>
#include <string>
#include <string_view>
#include <vector>
#include <algorithm>
#include <iostream>
#include "ILexer.h"
#include "TestDocument.h"
namespace {
const unsigned char UTF8BytesOfLead[256] = {
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 00 - 0F
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 10 - 1F
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 20 - 2F
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 30 - 3F
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 40 - 4F
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 50 - 5F
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 60 - 6F
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 70 - 7F
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 80 - 8F
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 90 - 9F
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // A0 - AF
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // B0 - BF
1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, // C0 - CF
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, // D0 - DF
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, // E0 - EF
4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // F0 - FF
};
int UnicodeFromUTF8(const unsigned char *us) noexcept {
switch (UTF8BytesOfLead[us[0]]) {
case 1:
return us[0];
case 2:
return ((us[0] & 0x1F) << 6) + (us[1] & 0x3F);
case 3:
return ((us[0] & 0xF) << 12) + ((us[1] & 0x3F) << 6) + (us[2] & 0x3F);
default:
return ((us[0] & 0x7) << 18) + ((us[1] & 0x3F) << 12) + ((us[2] & 0x3F) << 6) + (us[3] & 0x3F);
}
}
inline constexpr bool UTF8IsTrailByte(unsigned char ch) noexcept {
return (ch >= 0x80) && (ch < 0xc0);
}
}
void TestDocument::Set(std::string_view sv) {
text = sv;
textStyles.resize(text.size());
lineStarts.clear();
endStyled = 0;
lineStarts.push_back(0);
for (size_t pos = 0; pos < text.length(); pos++) {
if (text[pos] == '\n') {
lineStarts.push_back(pos + 1);
}
}
lineStarts.push_back(text.length());
lineStates.resize(lineStarts.size());
}
int SCI_METHOD TestDocument::Version() const {
return Scintilla::dvRelease4;
}
void SCI_METHOD TestDocument::SetErrorStatus(int) {
}
Sci_Position SCI_METHOD TestDocument::Length() const {
return text.length();
}
void SCI_METHOD TestDocument::GetCharRange(char *buffer, Sci_Position position, Sci_Position lengthRetrieve) const {
text.copy(buffer, lengthRetrieve, position);
}
char SCI_METHOD TestDocument::StyleAt(Sci_Position position) const {
return textStyles.at(position);
}
Sci_Position SCI_METHOD TestDocument::LineFromPosition(Sci_Position position) const {
if (position >= static_cast<Sci_Position>(text.length())) {
return lineStarts.size() - 1 - 1;
}
std::vector<Sci_Position>::const_iterator it = std::lower_bound(lineStarts.begin(), lineStarts.end(), position);
Sci_Position line = it - lineStarts.begin();
if (*it > position)
line--;
return line;
}
Sci_Position SCI_METHOD TestDocument::LineStart(Sci_Position line) const {
if (line >= static_cast<Sci_Position>(lineStarts.size())) {
return text.length();
}
return lineStarts.at(line);
}
int SCI_METHOD TestDocument::GetLevel(Sci_Position) const {
// Only for folding so not implemented yet
return 0;
}
int SCI_METHOD TestDocument::SetLevel(Sci_Position, int) {
// Only for folding so not implemented yet
return 0;
}
int SCI_METHOD TestDocument::GetLineState(Sci_Position line) const {
return lineStates.at(line);
}
int SCI_METHOD TestDocument::SetLineState(Sci_Position line, int state) {
return lineStates.at(line) = state;
}
void SCI_METHOD TestDocument::StartStyling(Sci_Position position) {
endStyled = position;
}
bool SCI_METHOD TestDocument::SetStyleFor(Sci_Position length, char style) {
for (Sci_Position i = 0; i < length; i++) {
textStyles[endStyled] = style;
endStyled++;
}
return true;
}
bool SCI_METHOD TestDocument::SetStyles(Sci_Position length, const char *styles) {
for (Sci_Position i = 0; i < length; i++) {
textStyles[endStyled] = styles[i];
endStyled++;
}
return true;
}
void SCI_METHOD TestDocument::DecorationSetCurrentIndicator(int) {
// Not implemented as no way to read decorations
}
void SCI_METHOD TestDocument::DecorationFillRange(Sci_Position, int, Sci_Position) {
// Not implemented as no way to read decorations
}
void SCI_METHOD TestDocument::ChangeLexerState(Sci_Position, Sci_Position) {
// Not implemented as no watcher to trigger
}
int SCI_METHOD TestDocument::CodePage() const {
// Always UTF-8 for now
return 65001;
}
bool SCI_METHOD TestDocument::IsDBCSLeadByte(char) const {
// Always UTF-8 for now
return false;
}
const char *SCI_METHOD TestDocument::BufferPointer() {
return text.c_str();
}
int SCI_METHOD TestDocument::GetLineIndentation(Sci_Position) {
// Never actually called - lexers use Accessor::IndentAmount
return 0;
}
Sci_Position SCI_METHOD TestDocument::LineEnd(Sci_Position line) const {
Sci_Position position = LineStart(line + 1);
position--; // Back over CR or LF
// When line terminator is CR+LF, may need to go back one more
if ((position > LineStart(line)) && (text.at(position - 1) == '\r')) {
position--;
}
return position;
}
Sci_Position SCI_METHOD TestDocument::GetRelativePosition(Sci_Position positionStart, Sci_Position characterOffset) const {
Sci_Position pos = positionStart;
if (characterOffset < 0) {
while (characterOffset < 0) {
if (pos <= 0) {
return 0;
}
unsigned char previousByte = text.at(pos - 1);
if (previousByte < 0x80) {
pos--;
characterOffset++;
} else {
while ((pos > 1) && UTF8IsTrailByte(previousByte)) {
pos--;
previousByte = text.at(pos - 1);
}
pos--;
// text[pos] is now a character start
characterOffset++;
}
}
return pos;
}
assert(characterOffset >= 0);
// TODO: invalid UTF-8
while (characterOffset > 0) {
Sci_Position width = 0;
GetCharacterAndWidth(pos, &width);
pos += width;
characterOffset--;
}
return pos;
}
int SCI_METHOD TestDocument::GetCharacterAndWidth(Sci_Position position, Sci_Position *pWidth) const {
// TODO: invalid UTF-8
if (position >= static_cast<Sci_Position>(text.length())) {
// Return NULs after document end
if (pWidth) {
*pWidth = 1;
}
return '\0';
}
const unsigned char leadByte = text.at(position);
const int widthCharBytes = UTF8BytesOfLead[leadByte];
unsigned char charBytes[] = { leadByte,0,0,0 };
for (int b = 1; b < widthCharBytes; b++)
charBytes[b] = text[position + b];
if (pWidth) {
*pWidth = widthCharBytes;
}
return UnicodeFromUTF8(charBytes);
}
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