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https://github.com/LadybirdBrowser/ladybird.git
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9e73b0b696
Previously, the client would decide when to ask the server for completions, and it would only do so for identifiers that had spans (determined via the highlighter!). Swap this around and make the server decide if it wants to complete something. This commit also adds a CompletionKind (which only has one value: Identifier), to work with other kinds of completions as well.
94 lines
3.6 KiB
C++
94 lines
3.6 KiB
C++
/*
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* Copyright (c) 2020, Itamar S. <itamar8910@gmail.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "AutoComplete.h"
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#include <AK/HashTable.h>
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#include <LibCpp/Lexer.h>
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// #define DEBUG_AUTOCOMPLETE
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namespace LanguageServers::Cpp {
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Vector<AutoCompleteResponse> AutoComplete::get_suggestions(const String& code, GUI::TextPosition autocomplete_position)
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{
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auto lines = code.split('\n', true);
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Lexer lexer(code);
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auto tokens = lexer.lex();
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auto index_of_target_token = token_in_position(tokens, autocomplete_position);
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if (!index_of_target_token.has_value())
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return {};
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auto suggestions = identifier_prefixes(lines, tokens, index_of_target_token.value());
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#ifdef DEBUG_AUTOCOMPLETE
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for (auto& suggestion : suggestions) {
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dbg() << "suggestion: " << suggestion.completion;
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}
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#endif
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return suggestions;
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}
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String AutoComplete::text_of_token(const Vector<String> lines, const Cpp::Token& token)
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{
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return lines[token.m_start.line].substring(token.m_start.column, token.m_end.column - token.m_start.column + 1);
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}
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Optional<size_t> AutoComplete::token_in_position(const Vector<Cpp::Token>& tokens, GUI::TextPosition position)
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{
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for (size_t token_index = 0; token_index < tokens.size(); ++token_index) {
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auto& token = tokens[token_index];
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if (token.m_start.line != position.line())
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continue;
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if (token.m_start.column > position.column() || token.m_end.column < position.column())
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continue;
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return token_index;
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}
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return {};
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}
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Vector<AutoCompleteResponse> AutoComplete::identifier_prefixes(const Vector<String> lines, const Vector<Cpp::Token>& tokens, size_t target_token_index)
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{
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auto partial_input = text_of_token(lines, tokens[target_token_index]);
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Vector<AutoCompleteResponse> suggestions;
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HashTable<String> suggestions_lookup; // To avoid duplicate results
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for (size_t i = 0; i < target_token_index; ++i) {
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auto& token = tokens[i];
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if (token.m_type != Cpp::Token::Type::Identifier)
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continue;
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auto text = text_of_token(lines, token);
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if (text.starts_with(partial_input) && !suggestions_lookup.contains(text)) {
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suggestions_lookup.set(text);
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suggestions.append({ text, partial_input.length(), HackStudio::CompletionKind::Identifier });
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}
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}
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return suggestions;
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}
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}
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