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fix: Finding utf-8 strings failed to select their location. (#1902)

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other separate, but closely related fixes are:

- fix: The previous fix also solved the (unreported) bug of being unable
to select utf-8 works by double-clicking.
- fix: The move to next/previous word (Ctr-arrow) behaved differently
depending on the direction. I made both the move left/right functions
share a much simpler algorithm and rewrote the find start/end of word
functions share the same code structure.


### Problem description
The code was using the byte index of the match into the utf-8 string to
store the match locations, but the code that sets the selection uses the
char index into the utf-8 string instead. Another problem was that the
search uses the byte index to determine if it needs to find more
matches.

### Implementation description
Both problems were solved by introducing two functions to switch from
coordinates in units of bytes to coordinates in units of chars and vice
versa.

Co-authored-by: Nik <werwolv98@gmail.com>
This commit is contained in:
paxcut 2024-09-15 06:16:19 -07:00 committed by GitHub
parent 928b4c6c4c
commit 3c060cc57a
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GPG Key ID: B5690EEEBB952194
2 changed files with 102 additions and 64 deletions
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4
lib/third_party/imgui/ColorTextEditor/include/TextEditor.h vendored
View File

@ -415,7 +415,9 @@ private:
int GetCharacterIndex(const Coordinates& aCoordinates) const;
int GetCharacterColumn(int aLine, int aIndex) const;
int GetLineCharacterCount(int aLine) const;
unsigned long long GetLineByteCount(int aLine) const;
int Utf8BytesToChars(const Coordinates &aCoordinates) const;
int Utf8CharsToBytes(const Coordinates &aCoordinates) const;
unsigned long long GetLineByteCount(int aLine) const;
int GetStringCharacterCount(std::string str) const;
int GetLineMaxColumn(int aLine) const;
bool IsOnWordBoundary(const Coordinates& aAt) const;

162
lib/third_party/imgui/ColorTextEditor/source/TextEditor.cpp vendored
View File

@ -304,6 +304,11 @@ TextEditor::Coordinates TextEditor::ScreenPosToCoordinates(const ImVec2 &aPositi
return SanitizeCoordinates(Coordinates(lineNo, columnCoord));
}
bool isWordChar(char c) {
auto asUChar = static_cast<unsigned char>(c);
return std::isalnum(asUChar) || c == '_' || asUChar > 0x7F;
}
TextEditor::Coordinates TextEditor::FindWordStart(const Coordinates &aFrom) const {
Coordinates at = aFrom;
if (at.mLine >= (int)mLines.size())
@ -315,30 +320,14 @@ TextEditor::Coordinates TextEditor::FindWordStart(const Coordinates &aFrom) cons
if (cindex >= (int)line.size())
return at;
while (cindex > 0 && isspace(line[cindex].mChar))
while (cindex > 0 && !isWordChar(line[cindex-1].mChar))
--cindex;
auto cstart = line[cindex].mChar;
while (cindex > 0) {
auto c = line[cindex].mChar;
if ((c & 0xC0) != 0x80) // not UTF code sequence 10xxxxxx
{
if (c <= 32 && isspace(c)) {
cindex++;
break;
}
if (isalnum(cstart) || cstart == '_') {
if (!isalnum(c) && c != '_') {
cindex++;
break;
}
} else {
break;
}
}
while (cindex > 0 && isWordChar(line[cindex - 1].mChar))
--cindex;
}
if (cindex==0 && line[cindex].mChar == '\"')
++cindex;
return Coordinates(at.mLine, GetCharacterColumn(at.mLine, cindex));
}
@ -353,22 +342,14 @@ TextEditor::Coordinates TextEditor::FindWordEnd(const Coordinates &aFrom) const
if (cindex >= (int)line.size())
return at;
bool prevspace = (bool)isspace(line[cindex].mChar);
auto cstart = (PaletteIndex)line[cindex].mColorIndex;
while (cindex < (int)line.size()) {
auto c = line[cindex].mChar;
auto d = UTF8CharLength(c);
if (cstart != (PaletteIndex)line[cindex].mColorIndex)
break;
while (cindex < (line.size()) && !isWordChar(line[cindex].mChar))
++cindex;
if (prevspace != !!isspace(c)) {
if (isspace(c))
while (cindex < (int)line.size() && isspace(line[cindex].mChar))
++cindex;
break;
}
cindex += d;
}
while (cindex < (line.size()) && isWordChar(line[cindex].mChar))
++cindex;
if (line[cindex-1].mChar == '\"')
--cindex;
return Coordinates(aFrom.mLine, GetCharacterColumn(aFrom.mLine, cindex));
}
@ -415,18 +396,50 @@ TextEditor::Coordinates TextEditor::FindNextWord(const Coordinates &aFrom) const
return at;
}
int TextEditor::Utf8BytesToChars(const Coordinates &aCoordinates) const {
if (aCoordinates.mLine >= mLines.size())
return -1;
auto &line = mLines[aCoordinates.mLine];
int c = 0;
int i = 0;
while (i < aCoordinates.mColumn) {
i += UTF8CharLength(line[i].mChar);
if (line[i].mChar == '\t')
c = (c / mTabSize) * mTabSize + mTabSize;
else
++c;
}
return c;
}
int TextEditor::Utf8CharsToBytes(const Coordinates &aCoordinates) const {
if (aCoordinates.mLine >= mLines.size())
return -1;
auto &line = mLines[aCoordinates.mLine];
int c = 0;
int i = 0;
while (i < line.size() && c < aCoordinates.mColumn) {
i += UTF8CharLength(line[i].mChar);
if (line[i].mChar == '\t')
c = (c / mTabSize) * mTabSize + mTabSize;
else
++c;
}
return i;
}
int TextEditor::GetCharacterIndex(const Coordinates &aCoordinates) const {
if (aCoordinates.mLine >= mLines.size())
return -1;
auto &line = mLines[aCoordinates.mLine];
int c = 0;
int i = 0;
for (; i < line.size() && c < aCoordinates.mColumn;) {
while (i < line.size() && c < aCoordinates.mColumn) {
i += UTF8CharLength(line[i].mChar);
if (line[i].mChar == '\t')
c = (c / mTabSize) * mTabSize + mTabSize;
else
++c;
i += UTF8CharLength(line[i].mChar);
}
return i;
}
@ -1567,42 +1580,44 @@ static bool IsUTFSequence(char c) {
}
void TextEditor::MoveLeft(int aAmount, bool aSelect, bool aWordMode) {
auto oldPos = mState.mCursorPosition;
ResetCursorBlinkTime();
if (mLines.empty())
if (mLines.empty() || oldPos.mLine >= mLines.size())
return;
auto oldPos = mState.mCursorPosition;
mState.mCursorPosition = GetActualCursorCoordinates();
auto line = mState.mCursorPosition.mLine;
auto lindex = mState.mCursorPosition.mLine;
auto cindex = GetCharacterIndex(mState.mCursorPosition);
while (aAmount-- > 0) {
const auto &line = mLines[lindex];
if (cindex == 0) {
if (line > 0) {
--line;
if ((int)mLines.size() > line)
cindex = (int)mLines[line].size();
if (lindex > 0) {
--lindex;
if ((int)mLines.size() > lindex)
cindex = (int)mLines[lindex].size();
else
cindex = 0;
}
} else {
--cindex;
if (cindex > 0) {
if ((int)mLines.size() > line) {
while (cindex > 0 && IsUTFSequence(mLines[line][cindex].mChar))
if ((int)mLines.size() > lindex) {
while (cindex > 0 && IsUTFSequence(line[cindex].mChar))
--cindex;
}
}
}
mState.mCursorPosition = Coordinates(line, GetCharacterColumn(line, cindex));
mState.mCursorPosition = Coordinates(lindex, GetCharacterColumn(lindex, cindex));
if (aWordMode) {
mState.mCursorPosition = FindWordStart(mState.mCursorPosition);
cindex = GetCharacterIndex(mState.mCursorPosition);
}
}
mState.mCursorPosition = Coordinates(line, GetCharacterColumn(line, cindex));
mState.mCursorPosition = Coordinates(lindex, GetCharacterColumn(lindex, cindex));
assert(mState.mCursorPosition.mColumn >= 0);
if (aSelect) {
@ -1628,25 +1643,39 @@ void TextEditor::MoveRight(int aAmount, bool aSelect, bool aWordMode) {
if (mLines.empty() || oldPos.mLine >= mLines.size())
return;
mState.mCursorPosition = GetActualCursorCoordinates();
auto cindex = GetCharacterIndex(mState.mCursorPosition);
auto lindex = mState.mCursorPosition.mLine;
while (aAmount-- > 0) {
auto lindex = mState.mCursorPosition.mLine;
auto &line = mLines[lindex];
if (cindex >= line.size()) {
if (mState.mCursorPosition.mLine < mLines.size() - 1) {
mState.mCursorPosition.mLine = std::max(0, std::min((int)mLines.size() - 1, mState.mCursorPosition.mLine + 1));
mState.mCursorPosition.mColumn = 0;
} else
return;
if (lindex < mLines.size() - 1) {
++lindex;
cindex = 0;
}
} else {
cindex += UTF8CharLength(line[cindex].mChar);
mState.mCursorPosition = Coordinates(lindex, GetCharacterColumn(lindex, cindex));
if (aWordMode)
mState.mCursorPosition = FindNextWord(mState.mCursorPosition);
++cindex;
if (cindex < (int)line.size()) {
if ((int)mLines.size() > lindex) {
while (cindex < (int)line.size() && IsUTFSequence(line[cindex].mChar))
++cindex;
}
}
}
mState.mCursorPosition = Coordinates(lindex, GetCharacterColumn(lindex, cindex));
if (aWordMode) {
mState.mCursorPosition = FindWordEnd(mState.mCursorPosition);
cindex = GetCharacterIndex(mState.mCursorPosition);
}
}
mState.mCursorPosition = Coordinates(lindex, GetCharacterColumn(lindex, cindex));
assert(mState.mCursorPosition.mColumn >= 0);
if (aSelect) {
if (oldPos == mInteractiveEnd)
mInteractiveEnd = SanitizeCoordinates(mState.mCursorPosition);
@ -2077,7 +2106,11 @@ std::string make_wholeWord(const std::string &s) {
// Performs actual search to fill mMatches
bool TextEditor::FindReplaceHandler::FindNext(TextEditor *editor, bool wrapAround) {
auto curPos = editor->mState.mCursorPosition;
Coordinates curPos;
curPos.mLine = mMatches.empty() ? editor->mState.mCursorPosition.mLine : mMatches.back().mCursorPosition.mLine;
curPos.mColumn = mMatches.empty() ? editor->mState.mCursorPosition.mColumn : editor->Utf8CharsToBytes(
mMatches.back().mCursorPosition);
unsigned long selectionLength = editor->GetStringCharacterCount(mFindWord);
size_t byteIndex = 0;
@ -2167,7 +2200,8 @@ bool TextEditor::FindReplaceHandler::FindNext(TextEditor *editor, bool wrapAroun
curPos.mColumn = textLoc - byteIndex;
auto &line = editor->mLines[curPos.mLine];
for (int i = 0; i < line.size(); i++) {
int lineSize = line.size();
for (int i = 0; i < std::min(lineSize,curPos.mColumn); i++) {
if (line[i].mChar == '\t')
curPos.mColumn += (editor->mTabSize - 1);
}
@ -2178,8 +2212,10 @@ bool TextEditor::FindReplaceHandler::FindNext(TextEditor *editor, bool wrapAroun
}
} else
return false;
auto selStart = curPos, selEnd = curPos;
Coordinates selStart, selEnd;
selStart.mLine = curPos.mLine;
selStart.mColumn = editor->Utf8BytesToChars(curPos);
selEnd = selStart;
selEnd.mColumn += selectionLength;
editor->SetSelection(selStart, selEnd);
editor->SetCursorPosition(selEnd);