From c3c0f8f78085bdc4698263513aea0c9b2d33bae4 Mon Sep 17 00:00:00 2001
From: c+1
Date: Tue, 21 Nov 2023 10:16:23 -0500
Subject: Basic block, expression, and number parsing.

---
 src/include/parser.h | 33 ++++++++++++++++++++-------------
 src/include/tree.h   |  7 +++++++
 2 files changed, 27 insertions(+), 13 deletions(-)

(limited to 'src/include')

diff --git a/src/include/parser.h b/src/include/parser.h
index b39f481..59bbbb5 100644
--- a/src/include/parser.h
+++ b/src/include/parser.h
@@ -11,6 +11,8 @@ typedef struct PARSER {
    
    /* The AST being produced. */
    tree_t* tree;
+
+   /* Pointer to the part of the tree the parser is currently working on. */
 } parser_t;
 
 /* Creates a new parser. */
@@ -26,26 +28,31 @@ void parser_destroy(parser_t* parser);
 /* Step the parser forward by 1 token. */
 int parser_nxt_token(parser_t* parser);
 
-/* Check whether the current token matches the given type. */
+/* 
+   Check whether the current token matches the given type.
+   - If it doesn't, return 0 and throw error.
+*/
 int parser_match(parser_t* parser, token_type_t type);
 
-/* 
-   parse lit: converting everything from strings to value in the tree
-   parse expr: (For now) call parse lit
-   parse blk: loop over all expressions until reaching an end block.
+/* Steps the parser forward by one token, then check whether the new token matches the given type. */
+int parser_nxt_token_match(parser_t* parser, token_type_t type);
 
+/* 
+   Parse a single literal value.
+   - Only does integers for now.
 */
+tree_t* parser_parse_lit(parser_t* parser);
+
+/* Return a tree for a single semicolon-separated expression.*/
+tree_t* parser_parse_expr(parser_t* parser);
 
-/* Parse a single literal value. */
-void parser_parse_lit(parser_t* parser);
+/* Return a tree for a single curly-brace-separated expression. */
+tree_t* parser_parse_block(parser_t* parser);
 
-/* Parse a single expression. */
-void parser_parse_expr(parser_t* parser);
 
-/* Parse a single block. */
-void parser_parse_blk(parser_t* parser);
+tree_t* parser_parse(parser_t* parser);
 
-/* Parse the given tokens. */
-void parser_parse(parser_t* parser);
+/* Parse with the given parser. */
+void parser_run(parser_t* parser);
 
 #endif
diff --git a/src/include/tree.h b/src/include/tree.h
index 3dfb5be..ba1f5a5 100644
--- a/src/include/tree.h
+++ b/src/include/tree.h
@@ -5,6 +5,7 @@
 
 typedef enum TREE_TYPE {
       TREE_TYPE_BLOCK,
+      TREE_TYPE_EXPR,
       TREE_TYPE_LINT,
       TREE_TYPE_LSTR,
       TREE_TYPE_TAG,
@@ -30,6 +31,12 @@ typedef struct TREE {
          struct TREE* nxt;
       } block;
 
+      /* Expression. */
+      struct TREE_DATA_EXPR {
+         /* The contents of the expression. */
+         struct TREE* val;
+      } expr;
+
       /* Literal integer. */
       struct TREE_DATA_LINT {
          int val;
-- 
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