330 lines
8.4 KiB
C++
330 lines
8.4 KiB
C++
// Lexilla lexer library
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/** @file TestDocument.cxx
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** Lexer testing.
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**/
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// Copyright 2019 by Neil Hodgson <neilh@scintilla.org>
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// The License.txt file describes the conditions under which this software may be distributed.
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#include <cassert>
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#include <string>
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#include <string_view>
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#include <vector>
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#include <algorithm>
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#include <iostream>
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#include "ILexer.h"
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#include "TestDocument.h"
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namespace {
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const unsigned char UTF8BytesOfLead[256] = {
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 00 - 0F
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 10 - 1F
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 20 - 2F
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 30 - 3F
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 40 - 4F
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 50 - 5F
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 60 - 6F
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 70 - 7F
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 80 - 8F
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 90 - 9F
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // A0 - AF
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // B0 - BF
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1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, // C0 - CF
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2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, // D0 - DF
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3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, // E0 - EF
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4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // F0 - FF
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};
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int UnicodeFromUTF8(const unsigned char *us) noexcept {
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assert(us);
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switch (UTF8BytesOfLead[us[0]]) {
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case 1:
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return us[0];
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case 2:
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return ((us[0] & 0x1F) << 6) + (us[1] & 0x3F);
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case 3:
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return ((us[0] & 0xF) << 12) + ((us[1] & 0x3F) << 6) + (us[2] & 0x3F);
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default:
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return ((us[0] & 0x7) << 18) + ((us[1] & 0x3F) << 12) + ((us[2] & 0x3F) << 6) + (us[3] & 0x3F);
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}
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}
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inline constexpr bool UTF8IsTrailByte(unsigned char ch) noexcept {
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return (ch >= 0x80) && (ch < 0xc0);
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}
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constexpr unsigned char TrailByteValue(unsigned char c) {
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// The top 2 bits are 0b10 to indicate a trail byte.
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// The lower 6 bits contain the value.
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return c & 0b0011'1111;
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}
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}
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std::u32string UTF32FromUTF8(std::string_view svu8) {
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std::u32string ret;
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for (size_t i = 0; i < svu8.length();) {
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unsigned char ch = svu8.at(i);
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const unsigned int byteCount = UTF8BytesOfLead[ch];
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unsigned int value = 0;
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if (i + byteCount > svu8.length()) {
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// Trying to read past end
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ret.push_back(ch);
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break;
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}
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i++;
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switch (byteCount) {
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case 1:
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value = ch;
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break;
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case 2:
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value = (ch & 0x1F) << 6;
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ch = svu8.at(i++);
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value += TrailByteValue(ch);
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break;
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case 3:
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value = (ch & 0xF) << 12;
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ch = svu8.at(i++);
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value += TrailByteValue(ch) << 6;
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ch = svu8.at(i++);
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value += TrailByteValue(ch);
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break;
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default:
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value = (ch & 0x7) << 18;
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ch = svu8.at(i++);
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value += TrailByteValue(ch) << 12;
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ch = svu8.at(i++);
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value += TrailByteValue(ch) << 6;
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ch = svu8.at(i++);
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value += TrailByteValue(ch);
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break;
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}
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ret.push_back(value);
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}
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return ret;
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}
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void TestDocument::Set(std::string_view sv) {
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text = sv;
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textStyles.resize(text.size() + 1);
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lineStarts.clear();
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endStyled = 0;
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lineStarts.push_back(0);
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for (size_t pos = 0; pos < text.length(); pos++) {
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if (text.at(pos) == '\n') {
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lineStarts.push_back(pos + 1);
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}
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}
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if (lineStarts.back() != Length()) {
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lineStarts.push_back(Length());
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}
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lineStates.resize(lineStarts.size() + 1);
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lineLevels.resize(lineStarts.size(), 0x400);
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}
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#if defined(_MSC_VER)
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// IDocument interface does not specify noexcept so best to not add it to implementation
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#pragma warning(disable: 26440)
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#endif
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Sci_Position TestDocument::MaxLine() const noexcept {
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return lineStarts.size() - 1;
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}
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int SCI_METHOD TestDocument::Version() const {
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return Scintilla::dvRelease4;
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}
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void SCI_METHOD TestDocument::SetErrorStatus(int) {
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}
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Sci_Position SCI_METHOD TestDocument::Length() const {
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return text.length();
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}
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void SCI_METHOD TestDocument::GetCharRange(char *buffer, Sci_Position position, Sci_Position lengthRetrieve) const {
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text.copy(buffer, lengthRetrieve, position);
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}
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char SCI_METHOD TestDocument::StyleAt(Sci_Position position) const {
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if (position < 0) {
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return 0;
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}
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return textStyles.at(position);
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}
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Sci_Position SCI_METHOD TestDocument::LineFromPosition(Sci_Position position) const {
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if (position >= Length()) {
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return MaxLine();
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}
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const std::vector<Sci_Position>::const_iterator it = std::lower_bound(lineStarts.begin(), lineStarts.end(), position);
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Sci_Position line = it - lineStarts.begin();
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if (*it > position)
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line--;
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return line;
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}
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Sci_Position SCI_METHOD TestDocument::LineStart(Sci_Position line) const {
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if (line < 0) {
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return 0;
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}
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if (line >= static_cast<Sci_Position>(lineStarts.size())) {
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return Length();
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}
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return lineStarts.at(line);
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}
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int SCI_METHOD TestDocument::GetLevel(Sci_Position line) const {
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return lineLevels.at(line);
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}
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int SCI_METHOD TestDocument::SetLevel(Sci_Position line, int level) {
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if (line == static_cast<Sci_Position>(lineLevels.size())) {
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return 0x400;
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}
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return lineLevels.at(line) = level;
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}
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int SCI_METHOD TestDocument::GetLineState(Sci_Position line) const {
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return lineStates.at(line);
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}
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int SCI_METHOD TestDocument::SetLineState(Sci_Position line, int state) {
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return lineStates.at(line) = state;
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}
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void SCI_METHOD TestDocument::StartStyling(Sci_Position position) {
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endStyled = position;
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}
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bool SCI_METHOD TestDocument::SetStyleFor(Sci_Position length, char style) {
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for (Sci_Position i = 0; i < length; i++) {
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textStyles.at(endStyled) = style;
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endStyled++;
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}
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return true;
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}
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bool SCI_METHOD TestDocument::SetStyles(Sci_Position length, const char *styles) {
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assert(styles);
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for (Sci_Position i = 0; i < length; i++) {
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textStyles.at(endStyled) = styles[i];
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endStyled++;
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}
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return true;
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}
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void SCI_METHOD TestDocument::DecorationSetCurrentIndicator(int) {
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// Not implemented as no way to read decorations
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}
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void SCI_METHOD TestDocument::DecorationFillRange(Sci_Position, int, Sci_Position) {
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// Not implemented as no way to read decorations
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}
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void SCI_METHOD TestDocument::ChangeLexerState(Sci_Position, Sci_Position) {
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// Not implemented as no watcher to trigger
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}
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int SCI_METHOD TestDocument::CodePage() const {
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// Always UTF-8 for now
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return 65001;
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}
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bool SCI_METHOD TestDocument::IsDBCSLeadByte(char) const {
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// Always UTF-8 for now
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return false;
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}
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const char *SCI_METHOD TestDocument::BufferPointer() {
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return text.c_str();
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}
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int SCI_METHOD TestDocument::GetLineIndentation(Sci_Position) {
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// Never actually called - lexers use Accessor::IndentAmount
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return 0;
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}
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Sci_Position SCI_METHOD TestDocument::LineEnd(Sci_Position line) const {
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const Sci_Position maxLine = MaxLine();
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if (line == maxLine || line == maxLine+1) {
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return text.length();
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}
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assert(line < maxLine);
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Sci_Position position = LineStart(line + 1);
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position--; // Back over CR or LF
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// When line terminator is CR+LF, may need to go back one more
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if ((position > LineStart(line)) && (text.at(position - 1) == '\r')) {
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position--;
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}
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return position;
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}
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Sci_Position SCI_METHOD TestDocument::GetRelativePosition(Sci_Position positionStart, Sci_Position characterOffset) const {
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Sci_Position pos = positionStart;
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if (characterOffset < 0) {
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while (characterOffset < 0) {
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if (pos <= 0) {
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return -1;
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}
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unsigned char previousByte = text.at(pos - 1);
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if (previousByte < 0x80) {
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pos--;
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characterOffset++;
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} else {
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while ((pos > 1) && UTF8IsTrailByte(previousByte)) {
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pos--;
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previousByte = text.at(pos - 1);
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}
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pos--;
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// text[pos] is now a character start
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characterOffset++;
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}
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}
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return pos;
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}
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assert(characterOffset >= 0);
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// TODO: invalid UTF-8
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while (characterOffset > 0) {
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Sci_Position width = 0;
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GetCharacterAndWidth(pos, &width);
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pos += width;
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characterOffset--;
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}
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return pos;
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}
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int SCI_METHOD TestDocument::GetCharacterAndWidth(Sci_Position position, Sci_Position *pWidth) const {
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// TODO: invalid UTF-8
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if ((position < 0) || (position >= Length())) {
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// Return NULs before document start and after document end
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if (pWidth) {
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*pWidth = 1;
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}
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return '\0';
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}
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const unsigned char leadByte = text.at(position);
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if (leadByte < 0x80) {
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if (pWidth) {
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*pWidth = 1;
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}
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return leadByte;
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}
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const int widthCharBytes = UTF8BytesOfLead[leadByte];
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unsigned char charBytes[] = { leadByte,0,0,0 };
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for (int b = 1; b < widthCharBytes; b++) {
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charBytes[b] = text.at(position + b);
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}
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if (pWidth) {
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*pWidth = widthCharBytes;
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}
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return UnicodeFromUTF8(charBytes);
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}
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