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refactor(lexer): change token_handle to token result

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Refs: #1
This commit is contained in:
Aleksander Krajewski
2026-06-02 16:47:02 +02:00
parent 3491f9aebb
commit cb7a348540
9 changed files with 162 additions and 111 deletions
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furc/src/front/lexer.cpp
+12 -6
View File
@@ -13,7 +13,7 @@ using namespace std::string_literals;
lexer::lexer(std::string_view filename, std::string_view content)
: m_filename(filename), m_content(content) {}
token_handle<> lexer::next_token() {
token_r lexer::next_token() {
skip_spaces();
while (m_cursor + 2 <= m_content.size() && m_content[m_cursor] == '/') {
if (m_content[m_cursor + 1] == '/') {
@@ -35,7 +35,8 @@ token_handle<> lexer::next_token() {
}
if (m_cursor + 2 >= m_content.size()) {
next();
return { current_location(), "unexpected end of file before enclosing `*/`" };
return token_r(
token_error{ current_location(), token_error_t::UnexpectedEof, "before enclosing `*/`" });
}
m_cursor += 2;
} else {
@@ -51,12 +52,14 @@ token_handle<> lexer::next_token() {
std::size_t begin = ++m_cursor;
while (m_cursor < m_content.size() && m_content[m_cursor] != '"')
++m_cursor;
if (m_cursor >= m_content.size()) return { current_location(), "unexpected end of file before enclosing '\"'" };
if (m_cursor >= m_content.size()) {
return token_r(token_error{ current_location(), token_error_t::UnexpectedEof, "before enclosing '\"'" });
}
++m_cursor;
return { location, token_t::String, m_content.substr(begin, m_cursor - begin - 1) };
}
case std::char_traits<char>::eof(): return { location, token_t::None };
case std::char_traits<char>::eof(): return token_r(token_error{ current_location(), token_error_t::EndOfFile });
default: {
if (std::isdigit(get()) != 0) {
integer_token integer = 0;
@@ -70,7 +73,9 @@ token_handle<> lexer::next_token() {
if (integer > upperBound || integer == upperBound && (integer - upperBound + digit) > (max % 10)) {
while (std::isdigit(get()) != 0)
++m_cursor;
return { location, "integer "s.append(m_content.substr(start, m_cursor - start)) + " is too big" };
return token_r(token_error{ location,
token_error_t::IntegerOverflow,
std::string(m_content.substr(start, m_cursor - start)) });
}
integer *= 10;
integer += digit;
@@ -150,7 +155,8 @@ token_handle<> lexer::next_token() {
return { location, type };
}
return { location, "unexpected character '"s.append(m_content.substr(m_cursor, length)) + "'" };
return token_r(
token_error{ location, token_error_t::UnexpectedCharacter, std::string(m_content.substr(m_cursor, 1)) });
}
}
}
furc/src/front/parser.cpp
+57 -51
View File
@@ -33,7 +33,7 @@ parser::parser(std::string_view filename)
ast::program_node_h parser::parse() & {
auto program = m_arena.allocate_shared<ast::program_node>();
while (peek_token().present() && peek_token()->type != token_t::None && !m_lexer.empty()) {
while (peek_token().has_value()) {
program->push(std::move(parse_declaration()));
}
@@ -47,30 +47,30 @@ ast::declaration_node_h parser::parse_declaration() {
auto first = next_token();
switch ((*first)->keyword) {
case keyword_token::Func: {
token_handle<> name = eat_token(token_t::Identifier);
if (name.has_error()) return { name.location(), name.error() };
auto name = eat_token(token_t::Identifier);
if (name.has_error()) return error_handle(name);
auto tok = eat_token(token_t::LParen);
if (tok.has_error()) return tok;
if (tok.has_error()) return error_handle(tok);
tok = eat_token(token_t::RParen);
if (tok.has_error()) return tok;
if (tok.has_error()) return error_handle(tok);
const auto& peek = peek_token();
if (peek.has_error()) return peek;
if (peek.has_error()) return error_handle(peek);
switch (peek->type) {
case token_t::LBrace: {
ast::body_h body = parse_body();
if (body.has_error()) return body;
return ast::function_definition_node_h{ first.location(), m_arena, *name, std::move(body) };
return ast::function_definition_node_h{ first->location, m_arena, *name, std::move(body) };
}
case token_t::Semicolon: {
m_peekBuffer.clear();
return ast::function_declaration_node_h{ first.location(), m_arena, *name };
return ast::function_declaration_node_h{ first->location, m_arena, *name };
}
default: return { tok.location(), "unexpected token "s + tok->type };
default: return { tok->location, "unexpected token "s + tok->type };
}
}
default: return { first.location(), "unexpected keyword "s + (*first)->keyword };
default: return { first->location, "unexpected keyword "s + (*first)->keyword };
}
}
case token_t::None:
@@ -85,15 +85,15 @@ ast::declaration_node_h parser::parse_declaration() {
case token_t::Semicolon:
case token_t::Colon:
default: {
return { first.location(), "unexpected token "s + first->type };
return { first->location, "unexpected token "s + first->type };
}
}
}
ast::statement_node_h parser::parse_statement() {
const auto& tok = peek_token();
if (tok.has_error()) return tok;
auto location = tok.location();
if (tok.has_error()) return error_handle(tok);
auto location = tok->location;
switch (tok->type) {
case token_t::Keyword: {
switch (tok->value.keyword) {
@@ -101,28 +101,28 @@ ast::statement_node_h parser::parse_statement() {
auto tok = next_token();
if (peek_token()->type == token_t::Semicolon) {
next_token();
return ast::return_statement_node_h{ tok.location(), m_arena };
return ast::return_statement_node_h{ tok->location, m_arena };
}
auto value = parse_expression();
auto err = eat_token(token_t::Semicolon);
if (err.has_error()) return err;
return ast::return_statement_node_h{ tok.location(), m_arena, std::move(value) };
if (err.has_error()) return error_handle(err);
return ast::return_statement_node_h{ tok->location, m_arena, std::move(value) };
}
case keyword_token::If: {
auto tok = next_token();
auto err = eat_token(token_t::LParen);
if (err.has_error()) return err;
if (err.has_error()) return error_handle(err);
auto cond = parse_expression();
err = eat_token(token_t::RParen);
if (err.has_error()) return err;
if (err.has_error()) return error_handle(err);
auto then = parse_statement();
if (then.has_error()) return then;
if (peek_token().present() && peek_token()->type == token_t::Keyword &&
if (peek_token().has_value() && peek_token()->type == token_t::Keyword &&
peek_token()->value.keyword == keyword_token::Else) {
next_token();
@@ -149,12 +149,12 @@ ast::statement_node_h parser::parse_statement() {
auto expression = parse_expression();
if (expression.present()) {
auto semi = eat_token(token_t::Semicolon);
if (semi.has_error()) return semi;
if (semi.has_error()) return error_handle(semi);
return std::move(expression);
}
auto token = next_token();
return { token.location(), "unexpected token "s + token->type + ", expected statement, declaration or expression" };
return { token->location, "unexpected token "s + token->type + ", expected statement, declaration or expression" };
}
ast::expression_node_h parser::parse_expression(std::uint32_t precedence) {
@@ -166,20 +166,20 @@ ast::literal_node_h parser::parse_literal() {
switch (tok->type) {
case token_t::String: {
auto tok = next_token();
return ast::string_literal_node_h{ tok.location(),
return ast::string_literal_node_h{ tok->location,
m_arena,
handle<std::string_view>{ tok.location(), (*tok)->string } };
handle<std::string_view>{ tok->location, (*tok)->string } };
}
case token_t::Integer: {
auto tok = next_token();
return ast::integer_literal_node_h{ tok.location(),
return ast::integer_literal_node_h{ tok->location,
m_arena,
handle<integer_token>{ tok.location(), (*tok)->integer } };
handle<integer_token>{ tok->location, (*tok)->integer } };
}
default: break;
}
return { tok.location(), "unexpected token "s + tok->type + ", expected literal" };
return { tok->location, "unexpected token "s + tok->type + ", expected literal" };
}
ast::expression_node_h parser::parse_expression_primary() {
@@ -187,21 +187,21 @@ ast::expression_node_h parser::parse_expression_primary() {
switch (tok->type) {
case token_t::Identifier: {
auto tok = next_token();
return ast::var_read_expression_node_h{ tok.location(),
return ast::var_read_expression_node_h{ tok->location,
m_arena,
handle<std::string_view>{ tok.location(), (*tok)->string } };
handle<std::string_view>{ tok->location, (*tok)->string } };
}
case token_t::LParen: {
auto tok = next_token();
auto node = parse_expression();
auto err = eat_token(token_t::RParen);
if (err.has_error()) return err;
if (err.has_error()) return error_handle(err);
return node;
}
default: {
auto literal = parse_literal();
if (literal.present()) return std::move(literal);
return { tok.location(), "unexpected token"s + tok->type + ", expected expression or literal" };
return { tok->location, "unexpected token"s + tok->type + ", expected expression or literal" };
}
}
}
@@ -235,7 +235,7 @@ ast::expression_node_h parser::parse_expression_unary(std::uint32_t precedence)
expression = parse_expression_unary(current.precedence + 1);
}
result = { token.location(), m_arena, current.type, std::move(expression) };
result = { token->location, m_arena, current.type, std::move(expression) };
}
if (!result.present()) return parse_expression_primary();
@@ -319,7 +319,7 @@ ast::expression_node_h parser::parse_expression_rhs(ast::expression_node_h&& ini
};
ast::expression_node_h lhs = std::move(init);
while (peek_token().present()) {
while (peek_token().has_value()) {
auto it = s_rhsops.find(peek_token()->type);
if (it == s_rhsops.end()) return lhs;
@@ -346,17 +346,17 @@ ast::expression_node_h parser::parse_expression_rhs(ast::expression_node_h&& ini
switch (current.type) {
case rhsop_info_t::Unaryop:
lhs = ast::unaryop_expression_node_h{ opToken.location(), m_arena, current.unary, std::move(lhs) };
lhs = ast::unaryop_expression_node_h{ opToken->location, m_arena, current.unary, std::move(lhs) };
break;
case rhsop_info_t::Binop:
lhs = ast::binop_expression_node_h{ opToken.location(),
lhs = ast::binop_expression_node_h{ opToken->location,
m_arena,
current.binary,
std::move(lhs),
std::move(rhs) };
break;
case rhsop_info_t::Assignment:
lhs = ast::var_assign_expression_node_h{ opToken.location(),
lhs = ast::var_assign_expression_node_h{ opToken->location,
m_arena,
current.assignment,
std::move(lhs),
@@ -370,44 +370,50 @@ ast::expression_node_h parser::parse_expression_rhs(ast::expression_node_h&& ini
ast::body_h parser::parse_body() {
ast::body body;
token_handle<> begin = eat_token(token_t::LBrace);
if (begin.has_error()) return begin;
body.begin = begin.location();
auto begin = eat_token(token_t::LBrace);
if (begin.has_error()) return error_handle(begin);
body.begin = begin->location;
while (!peek_token().has_error() && peek_token()->type != token_t::None && peek_token()->type != token_t::RBrace) {
body.statements.push_back(parse_statement());
}
token_handle<> end = eat_token(token_t::RBrace);
if (end.has_error()) return end;
body.end = end.location();
auto end = eat_token(token_t::RBrace);
if (end.has_error()) return error_handle(end);
body.end = end->location;
return { begin.location(), body };
return { begin->location, body };
}
token_handle<> parser::next_token() {
ast::node_handle<ast::node> parser::error_handle(const token_r& result) {
return { result.error().location, std::string(result.error().message) };
}
token_r parser::next_token() {
if (!m_peekBuffer.empty()) {
token_handle<> token = std::move(m_peekBuffer.back());
auto token = std::move(m_peekBuffer.back());
m_peekBuffer.pop_back();
return token;
}
return m_lexer.next_token();
}
const token_handle<>& parser::peek_token() {
const token_r& parser::peek_token() {
if (m_peekBuffer.empty()) {
token_handle<> token = m_lexer.next_token();
auto token = m_lexer.next_token();
return m_peekBuffer.emplace_back(std::move(token));
}
return m_peekBuffer.front();
}
token_handle<> parser::eat_token(token_t type) {
token_handle<> token = next_token();
if (!token.present()) return token;
token_r parser::eat_token(token_t type) {
auto token = next_token();
if (token.has_error()) return token;
if (token->type != type) {
if (token->type == token_t::None) return { token.location(), "unexpected end of file, expected " + type };
return { token.location(), "unexpected token "s + token->type + ", expected " + type };
if (token->type == token_t::None)
return token_r(token_error{ token->location, token_error_t::UnexpectedToken, ", expected " + type });
return token_r(
token_error{ token->location, token_error_t::UnexpectedToken, ""s + token->type + ", expected " + type });
}
return token;
}