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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) {
if (parser) { free(parser); }
}
/* TODO: What if the program begins with a ";"? */
int parser_nxt_token(parser_t* parser) {
/* Preserve original token list, to be cleaned up by lexer. */
parser->token = parser->token->nxt;
if (parser->token && parser->token->type == TOKEN_TYPE_EXPR_END) {
return parser_nxt_token(parser);
}
return parser->token ? 1 : 0;
}
/* I don't know if these need to exist. Guess I'll wait and see… */
int parser_match(parser_t* parser, token_type_t type) {
return parser->token->type == type;
}
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);
parser_nxt_token(parser);
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);
/* Move token value to tree, to allow for future token destruction. */
lstr->data.lstr.val = parser->token->val;
parser->token->val = NULL;
parser_nxt_token(parser);
return lstr;
}
tree_t* parser_parse_expr(parser_t* parser) {
tree_t* expr = NULL;
switch (parser->token->type) {
case TOKEN_TYPE_INT:
expr = parser_parse_lint(parser);
break;
case TOKEN_TYPE_STR:
expr = parser_parse_lstr(parser);
break;
default:
log_war("%s: Unknown token type: %d", __func__, parser->token->type);
parser_nxt_token(parser);
}
return expr;
}
tree_t* parser_parse_block(parser_t* parser) {
/* There is nothing to do. */
if (!parser->token || parser->token->type == TOKEN_TYPE_RBLOCK) {
return NULL;
}
tree_t* block;
block = tree_init(TREE_TYPE_BLOCK);
block->data.block.val = parser_parse_expr(parser);
block->data.block.nxt = parser_parse_block(parser);
return block;
}
tree_t* parser_parse_tag(parser_t* parser) {
if (parser->token->type != TOKEN_TYPE_TAG) { return NULL; }
tree_t* tag;
tag = tree_init(TREE_TYPE_TAG);
tag->data.tag.val = parser->token->val;
parser->token->val = NULL;
tag->data.tag.nxt = (
parser_nxt_token(parser) ?
parser_parse_tag(parser) :
NULL
);
return tag;
}
tree_t* parser_parse_darg(parser_t* parser) {
tree_t* darg;
darg = tree_init(TREE_TYPE_DARG);
if (parser->token->type != TOKEN_TYPE_TAG) { return NULL; }
darg->data.darg.tag = parser_parse_tag(parser);
log_war("%d", parser->token->type);
if (parser->token->type != TOKEN_TYPE_LIST_DELIM) {
darg->data.darg.nxt = NULL;
} else {
parser_nxt_token(parser) &&
(darg->data.darg.nxt = parser_parse_darg(parser));
}
return darg;
}
tree_t* parser_parse_def(parser_t* parser) {
tree_t* def;
def = tree_init(TREE_TYPE_DEF);
def->data.def.tag = parser_parse_tag(parser);
parser->token->type == TOKEN_TYPE_APPLY &&
parser_nxt_token(parser) &&
( def->data.def.arg = parser_parse_darg(parser) );
parser->token->type == TOKEN_TYPE_SET &&
parser_nxt_token(parser) &&
( def->data.def.val = parser_parse_expr(parser) );
return def;
}
tree_t* parser_parse_carg(parser_t* parser) {
tree_t* carg;
carg = tree_init(TREE_TYPE_CARG);
carg->data.carg.val = parser_parse_expr(parser);
carg->data.carg.nxt = (
parser_nxt_token_match(parser, TOKEN_TYPE_LIST_DELIM) &&
parser_nxt_token(parser)
) ?
parser_parse_carg(parser) :
NULL;
return carg;
}
tree_t* parser_parse_call(parser_t* parser) {
tree_t* call;
call = tree_init(TREE_TYPE_CALL);
call->data.call.target = parser->token->val;
parser->token->val = NULL;
call->data.call.arg = (
parser_nxt_token_match(parser, TOKEN_TYPE_APPLY) && parser_nxt_token(parser) ?
parser_parse_carg(parser) :
NULL
);
return call;
}
void parser_parse(parser_t* parser) {
while (parser->token) {
switch (parser->token->type) {
case TOKEN_TYPE_INT:
parser->tree->data.block.val = parser_parse_lint(parser);
break;
}
parser_nxt_token(parser);
}
}
void parser_run(parser_t* parser) {
parser->tree = parser_parse_block(parser);
}
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