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Shell: Rewrite Shell::possibly_print_error without deprecated API

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Also, not allocating copies of the current string all the time should be
a tiny bit more efficient. We can do this because the 'current_line' is
only used while reporting the error, so it will not be used once we
begin reading the next line.
This commit is contained in:
Ben Wiederhake 2023-05-27 13:12:13 +02:00 • committed by Jelle Raaijmakers
parent 8df8f4d75a
commit 0c86ee3876
1 changed files with 30 additions and 11 deletions
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41
Userland/Shell/Shell.cpp
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@ -2427,28 +2427,47 @@ void Shell::possibly_print_error() const
}
};
int line = -1;
DeprecatedString current_line;
// FIXME: Support arbitrarily long lines?
auto line_buf_or_error = ByteBuffer::create_uninitialized(4 * KiB);
if (line_buf_or_error.is_error()) {
warnln("Shell: Internal error while trying to display source information: {} (while allocating line buffer for {})", line_buf_or_error.error(), source_position.source_file);
return;
}
auto line_buf = line_buf_or_error.release_value();
StringView current_line;
i64 line_to_skip_to = max(source_position.position->start_line.line_number, 2ul) - 2;
if (!source_position.source_file.is_null()) {
auto file = Core::DeprecatedFile::open(source_position.source_file, Core::OpenMode::ReadOnly);
if (file.is_error()) {
warnln("Shell: Internal error while trying to display source information: {} (while reading '{}')", file.error(), source_position.source_file);
auto file_or_error = Core::File::open(source_position.source_file, Core::File::OpenMode::Read);
if (file_or_error.is_error()) {
warnln("Shell: Internal error while trying to display source information: {} (while reading '{}')", file_or_error.error(), source_position.source_file);
return;
}
auto file = Core::InputBufferedFile::create(file_or_error.release_value());
while (line < line_to_skip_to) {
if (file.value()->eof())
if (file.value()->is_eof())
return;
current_line = file.value()->read_line();
auto current_line_or_error = file.value()->read_line(line_buf);
if (current_line_or_error.is_error()) {
warnln("Shell: Internal error while trying to display source information: {} (while reading line {} of '{}')", current_line_or_error.error(), line, source_position.source_file);
return;
}
current_line = current_line_or_error.release_value();
++line;
}
for (; line < (i64)source_position.position->end_line.line_number + 2; ++line) {
do_line(line, current_line);
if (file.value()->eof())
current_line = "";
else
current_line = file.value()->read_line();
if (file.value()->is_eof()) {
current_line = ""sv;
} else {
auto current_line_or_error = file.value()->read_line(line_buf);
if (current_line_or_error.is_error()) {
warnln("Shell: Internal error while trying to display source information: {} (while reading line {} of '{}')", current_line_or_error.error(), line, source_position.source_file);
return;
}
current_line = current_line_or_error.release_value();
}
}
} else if (!source_position.literal_source_text.is_empty()) {
GenericLexer lexer { source_position.literal_source_text };
@ -2462,7 +2481,7 @@ void Shell::possibly_print_error() const
for (; line < (i64)source_position.position->end_line.line_number + 2; ++line) {
do_line(line, current_line);
if (lexer.is_eof())
current_line = "";
current_line = ""sv;
else
current_line = lexer.consume_line();
}