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LibCpp: Evaluate function-like macro calls

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Itamar 2021-08-13 12:49:06 +03:00 • committed by Andreas Kling
parent 8505fcb8ae
commit f6c9071f0d
2 changed files with 35 additions and 3 deletions
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37
Userland/Libraries/LibCpp/Preprocessor.cpp
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@ -250,14 +250,13 @@ size_t Preprocessor::do_substitution(Vector<Token> const& tokens, size_t token_i
if (!macro_call.has_value())
return token_index;
// TODO: Evaluate macro call
auto processed_value = defined_value.value;
Vector<Token> original_tokens;
for (size_t i = token_index; i <= macro_call->end_token_index; ++i) {
original_tokens.append(tokens[i]);
}
VERIFY(!original_tokens.is_empty());
auto processed_value = evaluate_macro_call(*macro_call, defined_value);
m_substitutions.append({ original_tokens, defined_value, processed_value });
Lexer lexer(processed_value);
@ -356,9 +355,41 @@ Optional<Preprocessor::Definition> Preprocessor::create_definition(StringView li
++token_index;
}
definition.value = line.substring_view(tokens[token_index].start().column);
if (token_index < tokens.size())
definition.value = line.substring_view(tokens[token_index].start().column);
return definition;
}
String Preprocessor::evaluate_macro_call(MacroCall const& macro_call, Definition const& definition)
{
if (macro_call.arguments.size() != definition.parameters.size()) {
dbgln("mismatch in # of arguments for macro call: {}", macro_call.name.text());
return {};
}
Lexer lexer { definition.value };
auto tokens = lexer.lex();
StringBuilder processed_value;
for (auto& token : tokens) {
if (token.type() != Token::Type::Identifier) {
processed_value.append(token.text());
continue;
}
auto param_index = definition.parameters.find_first_index(token.text());
if (!param_index.has_value()) {
processed_value.append(token.text());
continue;
}
auto& argument = macro_call.arguments[*param_index];
for (auto& arg_token : argument.tokens) {
processed_value.append(arg_token.text());
}
}
return processed_value.to_string();
}
};