From deb8d97be58847031e7f4ef25d7107cb2dbc35a3 Mon Sep 17 00:00:00 2001
From: c+1
Date: Sat, 6 May 2023 09:39:43 -0400
Subject: HALK HALK HALK

---
 src/include/parser.h | 46 +++++++++++++++++++++++++
 src/parser.c         | 94 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 140 insertions(+)
 create mode 100644 src/include/parser.h
 create mode 100644 src/parser.c

diff --git a/src/include/parser.h b/src/include/parser.h
new file mode 100644
index 0000000..5ff8366
--- /dev/null
+++ b/src/include/parser.h
@@ -0,0 +1,46 @@
+#ifndef PARSER_H
+#define PARSER_H
+
+
+#include "token.h"
+#include "tree.h"
+#include "lexer.h"
+
+
+typedef struct PARSER_STRUC {
+   lexer_t* lexer;
+   token_t* token;
+} parser_t;
+
+// initialize a parser
+parser_t* parser_init(lexer_t* lexer);
+
+// check for expected token, or throw syntax error
+void parser_check_expect(parser_t* parser, int token_type);
+
+// creates the abstract syntax tree
+tree_t* parser_parse(parser_t* parser);
+
+tree_t* parser_parse_token_id(parser_t* parser);
+
+// parse a single chunk
+tree_t* parser_parse_chunk(parser_t* parser);
+
+// parse all in list of chunks
+tree_t* parser_parse_chunks(parser_t* parser);
+
+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_var_def(parser_t* parser);
+
+tree_t* parser_parse_str(parser_t* parser);
+
+
+#endif
diff --git a/src/parser.c b/src/parser.c
new file mode 100644
index 0000000..c7f2851
--- /dev/null
+++ b/src/parser.c
@@ -0,0 +1,94 @@
+#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] PARSE ERROR at %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_ID: {
+         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->subtree_val = calloc(1, sizeof(struct TREE_STRUC));
+
+   tree_t* tree_chunk = parser_parse_chunk(parser);
+
+   subtree->subtree_val[0] = tree_chunk;
+
+   while (parser->token->type == TOKEN_SEMI) {
+      // expect semicolon
+      parser_check_expect(parser, TOKEN_SEMI);
+
+      // make room for new subtree
+      subtree->subtree_size ++;
+      subtree->subtree_val = realloc(
+         subtree->subtree_val,
+         subtree->subtree_size * sizeof(struct TREE_STRUC)
+      );
+
+      // add to end of list
+      subtree->subtree_val[subtree->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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