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#include "include/parser.h"
#include "include/token.h"
parser_t* parser_init(token_t* token) {
parser_t* parser;
parser = emalloc(sizeof(struct PARSER));
parser->token = token;
parser->tree = NULL;
return parser;
}
void parser_destroy(parser_t* parser) {
free(parser);
}
int parser_nxt_token(parser_t* parser) {
if (parser->token->nxt) {
parser->token = parser->token->nxt;
return 1;
} else {
return 0;
}
}
int parser_match(parser_t* parser, token_type_t type) {
if (parser->token->type == type) {
return 1;
} else {
log_err("Unexpected token.");
return 0;
}
}
int parser_nxt_token_match(parser_t* parser, token_type_t type) {
parser_nxt_token(parser);
return parser_match(parser, type);
}
tree_t* parser_parse_lint(parser_t* parser) {
tree_t* lint;
lint = tree_init(TREE_TYPE_LINT);
lint->data.lint.val = atoi(parser->token->val);
return lint;
}
tree_t* parser_parse_lstr(parser_t* parser) {
tree_t* lstr;
lstr = tree_init(TREE_TYPE_LSTR);
lstr->data.lstr.len = strlen(parser->token->val);
lstr->data.lstr.val = ecalloc(lstr->data.lstr.len + 1, sizeof(char));
lstr->data.lstr.val[lstr->data.lstr.len] = '\0';
strcpy(lstr->data.lstr.val, parser->token->val);
return lstr;
}
tree_t* parser_parse_expr(parser_t* parser) {
tree_t* expr;
expr = tree_init(TREE_TYPE_EXPR);
/* For now this is the only type of expression. */
switch (parser->token->type) {
case TOKEN_INT:
expr->data.expr.val = parser_parse_lint(parser);
break;
case TOKEN_STR:
expr->data.expr.val = parser_parse_lstr(parser);
break;
default:
return expr;
}
return expr;
}
tree_t* parser_parse_block(parser_t* parser) {
tree_t* block;
block = tree_init(TREE_TYPE_BLOCK);
if (parser->token->type == TOKEN_EXPR_END) {
if (parser_nxt_token(parser)) {
block->data.block.val = parser_parse_expr(parser);
} else {
block->data.block.val = NULL;
}
if (parser_nxt_token(parser)) {
block->data.block.nxt = parser_parse_block(parser);
} else {
block->data.block.nxt = NULL;
}
return block;
}
if (parser->token) {
block->data.block.val = parser_parse_expr(parser);
} else {
block->data.block.val = NULL;
}
if (parser_nxt_token(parser)) {
block->data.block.nxt = parser_parse_block(parser);
} else {
block->data.block.nxt = NULL;
}
return block;
}
tree_t* parser_parse(parser_t* parser) {
return parser_parse_block(parser);
}
void parser_run(parser_t* parser) {
parser->tree = parser_parse(parser);
}
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