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00182a2405
This ports the lexer to UTF-16 and deals with the immediate fallout up to the AST. The AST will be dealt with in upcoming commits. The lexer will still accept UTF-8 strings as input, and will transcode them to UTF-16 for lexing. This doesn't actually incur a new allocation, as we were already converting the input StringView to a ByteString for each lexer. One immediate logical benefit here is that we do not need to know off- hand how many UTF-8 bytes some special code points occupy. They all happen to be a single UTF-16 code unit. So instead of advancing the lexer by 3 positions in some cases, we can just always advance by 1.
47 lines
1.6 KiB
C++
47 lines
1.6 KiB
C++
/*
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* Copyright (c) 2020, Stephan Unverwerth <s.unverwerth@serenityos.org>
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* Copyright (c) 2021-2022, David Tuin <davidot@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/StringView.h>
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#include <AK/Vector.h>
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#include <LibJS/ParserError.h>
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#include <LibJS/Token.h>
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namespace JS {
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String ParserError::to_string() const
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{
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if (!position.has_value())
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return message;
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return MUST(String::formatted("{} (line: {}, column: {})", message, position.value().line, position.value().column));
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}
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ByteString ParserError::to_byte_string() const
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{
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if (!position.has_value())
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return message.to_byte_string();
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return ByteString::formatted("{} (line: {}, column: {})", message, position.value().line, position.value().column);
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}
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ByteString ParserError::source_location_hint(Utf16View const& source, char spacer, char indicator) const
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{
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if (!position.has_value())
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return {};
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// We need to modify the source to match what the lexer considers one line - normalizing
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// line terminators to \n is easier than splitting using all different LT characters.
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auto source_string = source.replace("\r\n"sv, "\n"sv, ReplaceMode::All).replace("\r"sv, "\n"sv, ReplaceMode::All).replace(LINE_SEPARATOR, "\n"sv, ReplaceMode::All).replace(PARAGRAPH_SEPARATOR, "\n"sv, ReplaceMode::All);
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StringBuilder builder;
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builder.append(source_string.split_view('\n', SplitBehavior::KeepEmpty)[position.value().line - 1]);
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builder.append('\n');
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for (size_t i = 0; i < position.value().column - 1; ++i)
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builder.append(spacer);
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builder.append(indicator);
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return builder.to_byte_string();
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}
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}
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