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#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "array.h"
#include "parser.h"
#include "lexer.h"
#include "string_view.h"
void
parser_init(parser_t *parser, char *file_name)
{
assert(parser && file_name);
lexer_init(&parser->lexer, file_name);
}
void
parser_next_expected_token(parser_t *parser, token_t *token, token_kind_t kind)
{
lexer_next_token(&parser->lexer, token);
if (token->kind != kind) {
fprintf(
stderr,
"%s:%zu:%zu: parser error: expected token <%s> but got <%s>.\n",
parser->lexer.file_name,
token->loc.lineno + 1,
token->loc.offset - token->loc.lineoffset + 1,
token_to_cstr(kind),
token_to_cstr(token->kind));
exit(EXIT_FAILURE);
}
}
inst_t *
parser_parse(parser_t *parser) {
inst_t *insts = array(inst_t);
token_t token = { 0 };
int label_count = 0;
lexer_next_token(&parser->lexer, &token);
while (token.kind != TOKEN_EOF) {
switch (token.kind) {
case TOKEN_KW_PUSH: {
parser_next_expected_token(parser, &token, TOKEN_NUMBER);
char value[token.value.size + 1];
value[token.value.size] = '\0';
memcpy(value, token.value.chars, token.value.size);
array_append(insts, ((inst_t) { .type = INST_PUSH, .operand = atoi(value) }));
parser_next_expected_token(parser, &token, TOKEN_EOS);
break;
}
case TOKEN_KW_ADD: {
array_append(insts, ((inst_t) { .type = INST_ADD }));
parser_next_expected_token(parser, &token, TOKEN_EOS);
break;
}
case TOKEN_KW_DUP: {
array_append(insts, ((inst_t) { .type = INST_DUP }));
parser_next_expected_token(parser, &token, TOKEN_EOS);
break;
}
case TOKEN_KW_SWAP: {
array_append(insts, ((inst_t) { .type = INST_SWAP }));
parser_next_expected_token(parser, &token, TOKEN_EOS);
break;
}
case TOKEN_KW_SUB: {
array_append(insts, ((inst_t) { .type = INST_SUB }));
parser_next_expected_token(parser, &token, TOKEN_EOS);
break;
}
case TOKEN_KW_MUL: {
array_append(insts, ((inst_t) { .type = INST_MUL }));
parser_next_expected_token(parser, &token, TOKEN_EOS);
break;
}
case TOKEN_KW_STORE: {
array_append(insts, ((inst_t) { .type = INST_STORE }));
parser_next_expected_token(parser, &token, TOKEN_EOS);
break;
}
case TOKEN_KW_LOAD: {
array_append(insts, ((inst_t) { .type = INST_LOAD }));
parser_next_expected_token(parser, &token, TOKEN_EOS);
break;
}
case TOKEN_KW_RET: {
array_append(insts, ((inst_t) { .type = INST_RET }));
parser_next_expected_token(parser, &token, TOKEN_EOS);
break;
}
case TOKEN_IDENT: {
array_append(insts, ((inst_t) { .type = INST_LABEL, .operand = label_count++ }));
parser_next_expected_token(parser, &token, TOKEN_COLON);
parser_next_expected_token(parser, &token, TOKEN_EOS);
break;
}
case TOKEN_KW_JMP: {
parser_next_expected_token(parser, &token, TOKEN_NUMBER);
char value[token.value.size + 1];
value[token.value.size] = '\0';
memcpy(value, token.value.chars, token.value.size);
array_append(insts, ((inst_t) { .type = INST_JMP, .operand = atoi(value) }));
parser_next_expected_token(parser, &token, TOKEN_EOS);
break;
}
case TOKEN_KW_JMPZ: {
parser_next_expected_token(parser, &token, TOKEN_NUMBER);
char value[token.value.size + 1];
value[token.value.size] = '\0';
memcpy(value, token.value.chars, token.value.size);
array_append(insts, ((inst_t) { .type = INST_JMPZ, .operand = atoi(value) }));
parser_next_expected_token(parser, &token, TOKEN_EOS);
break;
}
case TOKEN_KW_CALL: {
parser_next_expected_token(parser, &token, TOKEN_NUMBER);
char value[token.value.size + 1];
value[token.value.size] = '\0';
memcpy(value, token.value.chars, token.value.size);
array_append(insts, ((inst_t) { .type = INST_CALL, .operand = atoi(value) }));
parser_next_expected_token(parser, &token, TOKEN_EOS);
break;
}
case TOKEN_KW_READI: {
array_append(insts, ((inst_t) { .type = INST_READI }));
parser_next_expected_token(parser, &token, TOKEN_EOS);
break;
}
case TOKEN_KW_READC: {
array_append(insts, ((inst_t) { .type = INST_READC }));
parser_next_expected_token(parser, &token, TOKEN_EOS);
break;
}
case TOKEN_KW_PRINTI: {
array_append(insts, ((inst_t) { .type = INST_PRINTI }));
parser_next_expected_token(parser, &token, TOKEN_EOS);
break;
}
case TOKEN_KW_PRINTC: {
array_append(insts, ((inst_t) { .type = INST_PRINTC }));
parser_next_expected_token(parser, &token, TOKEN_EOS);
break;
}
case TOKEN_KW_END: {
array_append(insts, ((inst_t) { .type = INST_END }));
parser_next_expected_token(parser, &token, TOKEN_EOS);
break;
}
case TOKEN_EOS: {
break;
}
default: break;
}
lexer_next_token(&parser->lexer, &token);
}
return insts;
}
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