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LibGUI: Add word break locator methods to TextDocument

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TextDocument now has utilities to locate a word break both before
and after any TextPosition.
This commit is contained in:
FalseHonesty
2020-05-23 18:40:14 -04:00
committed by Andreas Kling
parent a1fe34bcd8
commit a3bf8c72f3
2 changed files with 51 additions and 0 deletions
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48
Libraries/LibGUI/TextDocument.cpp
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@@ -427,6 +427,54 @@ Optional<TextDocumentSpan> TextDocument::first_non_skippable_span_after(const Te
return {};
}
TextPosition TextDocument::first_word_break_before(const TextPosition& position) const
{
if (position.column() == 0) {
if (position.line() == 0) {
return TextPosition(0, 0);
}
auto previous_line = this->line(position.line() - 1);
return TextPosition(position.line() - 1, previous_line.length());
}
auto target = position;
auto line = this->line(target.line());
auto is_start_alphanumeric = isalnum(line.codepoints()[target.column() - 1]);
while (target.column() > 0) {
auto next_codepoint = line.codepoints()[target.column() - 1];
if ((is_start_alphanumeric && !isalnum(next_codepoint)) || (!is_start_alphanumeric && isalnum(next_codepoint)))
break;
target.set_column(target.column() - 1);
}
return target;
}
TextPosition TextDocument::first_word_break_after(const TextPosition& position) const
{
auto target = position;
auto line = this->line(target.line());
if (position.column() >= line.length()) {
if (position.line() >= this->line_count() - 1) {
return position;
}
return TextPosition(position.line() + 1, 0);
}
auto is_start_alphanumeric = isalnum(line.codepoints()[target.column()]);
while (target.column() < line.length()) {
auto next_codepoint = line.codepoints()[target.column()];
if ((is_start_alphanumeric && !isalnum(next_codepoint)) || (!is_start_alphanumeric && isalnum(next_codepoint)))
break;
target.set_column(target.column() + 1);
}
return target;
}
void TextDocument::undo()
{
if (!can_undo())