ivy/asm/parse/atom.c

#include "parse.h"

#include <ivy/asm/assembler.h>
#include <ivy/asm/bin.h>
#include <ivy/asm/lex.h>
#include <ivy/ident.h>

struct atom_parser_state {
	struct parser_state s_base;
	unsigned int s_prev_token;

	struct ivy_asm_token *s_name;
};

static void init_state(struct ivy_asm_parser *ctx, struct parser_state *s)
{
	struct atom_parser_state *state = (struct atom_parser_state *)s;
	state->s_prev_token = IVY_ASM_SYM_LEFT_PAREN;
}

static enum ivy_status parse_ident(
	struct ivy_asm_parser *ctx, struct ivy_asm_token *tok)
{
	struct atom_parser_state *state
		= (struct atom_parser_state *)asm_parser_get_state(ctx);
	if (state->s_prev_token != IVY_ASM_SYM_LEFT_PAREN) {
		return IVY_ERR_BAD_SYNTAX;
	}

	if (state->s_name) {
		return IVY_ERR_BAD_SYNTAX;
	}

	state->s_name = tok;
	state->s_prev_token = IVY_ASM_TOK_IDENT;

	return IVY_OK;
}

static enum ivy_status parse_right_paren(
	struct ivy_asm_parser *ctx, struct ivy_asm_token *tok)
{
	struct atom_parser_state *state
		= (struct atom_parser_state *)asm_parser_get_state(ctx);

	if (state->s_prev_token != IVY_ASM_TOK_IDENT) {
		return IVY_ERR_BAD_SYNTAX;
	}

	if (!state->s_name) {
		return IVY_ERR_BAD_SYNTAX;
	}

	asm_parser_pop_state(ctx, state->s_name);
	return IVY_OK;
}

struct parser_state_type atom_parser_state_type = {
	.n_init_state = init_state,
	.n_state_size = sizeof(struct atom_parser_state),
	.n_token_parsers = {
		TOK_PARSER(IDENT, parse_ident),
	},
	.n_symbol_parsers = {
		SYM_PARSER(RIGHT_PAREN, parse_right_paren),
	},
};