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can now parse prefix expressions!

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This commit is contained in:
Karma Riuk
2025-07-09 12:02:01 +02:00
parent c7a30a0028
commit 7f1cc6f45e
6 changed files with 118 additions and 52 deletions
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94
test/parser/expression.cpp
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@@ -4,6 +4,16 @@
#include "utils.hpp"
#include <doctest.h>
#include <sstream>
void test_integer_literal(ast::expression* expr, int value) {
ast::integer_literal* int_lit = cast<ast::integer_literal>(expr);
REQUIRE(int_lit->value == value);
std::ostringstream oss;
oss << value;
REQUIRE(int_lit->token_literal() == oss.str());
}
TEST_SUITE("Parser: expression") {
TEST_CASE_FIXTURE(
@@ -32,57 +42,39 @@ TEST_SUITE("Parser: expression") {
ast::expression_stmt* expression_stmt =
cast<ast::expression_stmt>(program->statements[0]);
ast::integer_literal* int_lit =
cast<ast::integer_literal>(expression_stmt->expression);
REQUIRE(int_lit->value == 5);
REQUIRE(int_lit->token_literal() == "5");
test_integer_literal(expression_stmt->expression, 5);
};
// TEST_CASE_FIXTURE(
// ParserFixture,
// "Simple expression statement with prefix before integer"
// ) {
// SUBCASE("Prefix: '!'") {
// setup("!5;");
//
// REQUIRE(program->statements.size() == 1);
// ast::expression_stmt* expression_stmt =
// cast<ast::expression_stmt>(program->statements[0]);
//
// ast::prefix_expr* prefix_expr;
// REQUIRE_NOTHROW(
// prefix_expr =
// dynamic_cast<ast::prefix_expr*>(expression_stmt->expression)
// );
// REQUIRE_MESSAGE(
// prefix_expr != nullptr,
// "Couldn't cast expression to an identifier"
// );
//
// REQUIRE(prefix_expr->value == 5);
// REQUIRE(prefix_expr->token_literal() == "5");
// }
// SUBCASE("Prefix: '-'") {
// setup("-15;");
//
// REQUIRE(program->statements.size() == 1);
// ast::expression_stmt* expression_stmt =
// get_expression_stmt(program->statements[0]);
//
// ast::integer_literal* int_lit;
// REQUIRE_NOTHROW(
// int_lit = dynamic_cast<ast::integer_literal*>(
// expression_stmt->expression
// )
// );
// REQUIRE_MESSAGE(
// int_lit != nullptr,
// "Couldn't cast expression to an identifier"
// );
//
// REQUIRE(int_lit->value == 5);
// REQUIRE(int_lit->token_literal() == "5");
// }
// }
TEST_CASE_FIXTURE(
ParserFixture,
"Simple expression statement with prefix before integer"
) {
SUBCASE("Prefix: '!'") {
setup("!5;");
REQUIRE(program->statements.size() == 1);
ast::expression_stmt* expression_stmt =
cast<ast::expression_stmt>(program->statements[0]);
ast::prefix_expr* prefix_expr =
cast<ast::prefix_expr>(expression_stmt->expression);
REQUIRE(prefix_expr->op == "!");
test_integer_literal(prefix_expr->right, 5);
}
SUBCASE("Prefix: '-'") {
setup("-15;");
REQUIRE(program->statements.size() == 1);
ast::expression_stmt* expression_stmt =
cast<ast::expression_stmt>(program->statements[0]);
ast::prefix_expr* prefix_expr =
cast<ast::prefix_expr>(expression_stmt->expression);
REQUIRE(prefix_expr->op == "-");
test_integer_literal(prefix_expr->right, 15);
}
}
}