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CppAutoComplete gets a string of code and a position within it, and returns a Vector of auto-complete suggestions that are relevant for the given position. Currently, it's very naive - it uses our CppLexer to find identifiers in the code which the auto-complete target is a prefix of.
92 lines
3.5 KiB
C++
92 lines
3.5 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 "CppAutoComplete.h"
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#include <AK/HashTable.h>
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#include <LibGUI/CppLexer.h>
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// #define DEBUG_AUTOCOMPLETE
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namespace HackStudio {
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Vector<String> CppAutoComplete::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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GUI::CppLexer 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;
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}
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#endif
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return suggestions;
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}
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String CppAutoComplete::text_of_token(const Vector<String> lines, const GUI::CppToken& 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> CppAutoComplete::token_in_position(const Vector<GUI::CppToken>& 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<String> CppAutoComplete::identifier_prefixes(const Vector<String> lines, const Vector<GUI::CppToken>& 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<String> 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 != GUI::CppToken::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);
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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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