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parser: add identifiers

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This commit is contained in:
Zack Buhman 2023-08-20 17:42:57 +00:00
parent cd0c9c7c8c
commit 05664bb132
6 changed files with 25 additions and 9 deletions
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15
ast.cpp
View File

@ -3,11 +3,6 @@
namespace dsp {
void ast_printer_t::visit(const unary_t * unary) const
{
parenthesize((unary->oper).lexeme, unary->right);
}
void ast_printer_t::visit(const binary_t * binary) const
{
parenthesize((binary->oper).lexeme, binary->left, binary->right);
@ -18,11 +13,21 @@ void ast_printer_t::visit(const grouping_t * grouping) const
parenthesize("grouping", grouping->expr);
}
void ast_printer_t::visit(const identifier_t * identifier) const
{
parenthesize("identifier", identifier->name.lexeme);
}
void ast_printer_t::visit(const literal_t * literal) const
{
os << std::to_string(literal->value);
}
void ast_printer_t::visit(const unary_t * unary) const
{
parenthesize((unary->oper).lexeme, unary->right);
}
void ast_printer_t::parenthesize(const std::string_view s, const expr_t * a) const
{
os << '(' << s << ' ';

3
ast.hpp
View File

@ -17,10 +17,11 @@ struct ast_printer_t : visitor_t<void>
std::ostream& os;
void visit(const unary_t * unary) const;
void visit(const binary_t * binary) const;
void visit(const grouping_t * grouping) const;
void visit(const identifier_t * identifier) const;
void visit(const literal_t * literal) const;
void visit(const unary_t * unary) const;
void visit(const op::alu_t * alu) const;
void visit(const op::mov_ram_x_t * mov_ram_x) const;

8
expr.hpp
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@ -44,6 +44,14 @@ struct grouping_t : expr_accept_t<grouping_t>
const expr_t * expr;
};
struct identifier_t : expr_accept_t<identifier_t>
{
identifier_t(token_t name)
: name(name) {}
const token_t name;
};
struct literal_t : expr_accept_t<literal_t>
{
literal_t(num_t value)

1
parser.cpp
View File

@ -151,6 +151,7 @@ expr_t * parser_t::orl()
expr_t * parser_t::primary()
{
if (match(number)) return new literal_t(std::get<num_t>(previous().literal));
else if (match(identifier)) return new identifier_t(previous());
if (match(left_paren)) {
expr_t * expr = expression();

2
visitable.hpp
View File

@ -5,9 +5,9 @@ namespace dsp {
// expressions
struct binary_t;
struct grouping_t;
struct identifier_t;
struct literal_t;
struct unary_t;
struct assign_t;
// instructions
namespace op {

3
visitor.hpp
View File

@ -8,10 +8,11 @@ namespace dsp {
template <typename T>
struct visitor_t
{
virtual T visit(const unary_t * expr) const = 0;
virtual T visit(const binary_t * expr) const = 0;
virtual T visit(const grouping_t * expr) const = 0;
virtual T visit(const identifier_t * expr) const = 0;
virtual T visit(const literal_t * expr) const = 0;
virtual T visit(const unary_t * expr) const = 0;
virtual T visit(const op::alu_t * stmt) const = 0;
virtual T visit(const op::mov_ram_x_t * mov_ram_x) const = 0;