From f41317b598e59eefaa912f0d49fe2b1817573d88 Mon Sep 17 00:00:00 2001
From: dec05eba <dec05eba@protonmail.com>
Date: Sun, 3 Mar 2019 15:57:21 +0100
Subject: Cleanup, fix syntax def

---
 src/parser.c | 33 +++++++++++++++++++++------------
 1 file changed, 21 insertions(+), 12 deletions(-)

diff --git a/src/parser.c b/src/parser.c
index a3bd330..fb18685 100644
--- a/src/parser.c
+++ b/src/parser.c
@@ -84,17 +84,30 @@ static THROWABLE parser_parse_body_loop(Parser *self, Buffer *body_list, Token e
 }
 
 /*
-LHS =   ('const' TOK_IDENTIFIER '=') |
-        ('var' TOK_IDENTIFIER '='|';')
+VAR_TYPE_DEF = ':' TOK_IDENTIFIER
+*/
+static THROWABLE parser_parse_var_type_def(Parser *self, BufferView *type_name) {
+    bool match;
+    throw_if_error(tokenizer_consume_if(&self->tokenizer, TOK_COLON, &match));
+    if(match) {
+        throw_if_error(tokenizer_accept(&self->tokenizer, TOK_IDENTIFIER));
+        *type_name = self->tokenizer.value.identifier;
+    }
+    return PARSER_OK;
+}
+
+/*
+LHS =   ('const' TOK_IDENTIFIER VAR_TYPE_DEF? '=') |
+        ('var' TOK_IDENTIFIER VAR_TYPE_DEF? '='|';')
 */
 static THROWABLE parser_parse_lhs(Parser *self, LhsExpr **result, bool *assignment) {
-    bool isConst;
+    bool is_const;
     bool match;
     BufferView var_name;
     *result = NULL;
 
-    throw_if_error(tokenizer_consume_if(&self->tokenizer, TOK_CONST, &isConst));
-    if(!isConst) {
+    throw_if_error(tokenizer_consume_if(&self->tokenizer, TOK_CONST, &is_const));
+    if(!is_const) {
         bool isVar;
         throw_if_error(tokenizer_consume_if(&self->tokenizer, TOK_VAR, &isVar));
         if(!isVar)
@@ -105,13 +118,9 @@ static THROWABLE parser_parse_lhs(Parser *self, LhsExpr **result, bool *assignme
     var_name = self->tokenizer.value.identifier;
     amal_log_debug("var name: %.*s", (int)var_name.size, var_name.data);
     throw_if_error(scoped_allocator_alloc(self->allocator, sizeof(LhsExpr), (void**)result));
-    lhsexpr_init(*result, isConst, var_name);
+    lhsexpr_init(*result, is_const, var_name);
 
-    throw_if_error(tokenizer_consume_if(&self->tokenizer, TOK_COLON, &match));
-    if(match) {
-        throw_if_error(tokenizer_accept(&self->tokenizer, TOK_IDENTIFIER));
-        (*result)->type_name = self->tokenizer.value.identifier;
-    }
+    try(parser_parse_var_type_def(self, &(*result)->type_name));
 
     throw_if_error(tokenizer_consume_if(&self->tokenizer, TOK_EQUALS, &match));
     if(match) {
@@ -121,7 +130,7 @@ static THROWABLE parser_parse_lhs(Parser *self, LhsExpr **result, bool *assignme
     
     *assignment = bool_false;
     throw_if_error(tokenizer_consume_if(&self->tokenizer, TOK_SEMICOLON, &match));
-    if(match && isConst) {
+    if(match && is_const) {
         self->error = tokenizer_create_error(&self->tokenizer, "const variable declaration requires assignment (expected '=', got ';')");
         throw(PARSER_UNEXPECTED_TOKEN);
     }
-- 
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