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#include "include/parser.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
// initialize a parser
parser_t* parser_init(lexer_t* lexer) {
parser_t* parser = calloc(1, sizeof(struct PARSER_STRUC));
parser->lexer = lexer;
parser->token = lexer_get_next_token(lexer);
return parser;
}
// check for expected token, or throw syntax error
void parser_check_expect(parser_t* parser, int token_type) {
if (parser->token->type == token_type) {
parser->token = lexer_get_next_token(parser->lexer);
} else {
printf("[ERRR] [%d]\n\tUnexpected token '%s' with type '%d'.",
parser->lexer->i, parser->token->value, parser->token->type);
exit(1);
}
}
// creates the abstract syntax tree
tree_t* parser_parse(parser_t* parser) {
return parser_parse_chunks();
}
tree_t* parser_parse_token_id(parser_t* parser) {
if (strcmp(parser->token->value, "var")) {
return parser_parse_var(parser);
} else { // if id not recognized, check for variables under that name
return parser_parse_var_def(parser);
}
}
// parse a single chunk
tree_t* parser_parse_chunk(parser_t* parser) {
switch (parser->token->type) {
case TOKEN_KEYWORD: {
return parser_parse_token_id(parser);
}
}
}
// parse all in list of chunks
tree_t* parser_parse_chunks(parser_t* parser) {
// initialize the subtree to return
tree_t* subtree = tree_init(TREE_SUBTREE);
// initialize the subtree_val with unit size
subtree->data.subtree.size = calloc(1, sizeof(struct TREE_STRUC));
tree_t* tree_chunk = parser_parse_chunk(parser);
subtree->data.subtree.val[0] = tree_chunk;
while (parser->token->type == TOKEN_END) {
// expect semicolon
parser_check_expect(parser, TOKEN_END);
// make room for new subtree
subtree->data.subtree.size ++;
subtree->data.subtree.val = realloc(
subtree->data.subtree.val,
subtree->data.subtree.size * sizeof(struct TREE_STRUC)
);
// add to end of list
subtree->data.subtree.val[subtree->data.subtree.size - 1] = tree_chunk;
}
return subtree;
}
tree_t* parser_parse_expr(parser_t* parser);
tree_t* parser_parse_fac(parser_t* parser);
tree_t* parser_parse_term(parser_t* parser);
tree_t* parser_parse_fn_call(parser_t* parser);
tree_t* parser_parse_var(parser_t* parser);
tree_t* parser_parse_str(parser_t* parser);
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