From 00ab5c3488c02beab5c3f4e371f5196404334e3c Mon Sep 17 00:00:00 2001
From: dec05eba <dec05eba@protonmail.com>
Date: Sat, 2 Mar 2019 00:40:08 +0100
Subject: Fix crash in parser import, optimize tokenizer_consume_if to not
 reparse if already parsed

---
 src/parser.c    | 29 +++++++++++++++++++++--------
 src/tokenizer.c | 37 +++++++++++++++++++++++++++----------
 2 files changed, 48 insertions(+), 18 deletions(-)

(limited to 'src')

diff --git a/src/parser.c b/src/parser.c
index 81f0a92..e63814f 100644
--- a/src/parser.c
+++ b/src/parser.c
@@ -70,7 +70,7 @@ static CHECK_RESULT int parser_parse_lhs(Parser *self, LhsExpr **result) {
 }
 
 /*
-FUNC_DECL = '(' PARAM* ')' '{' BODY* '}'
+CLOSURE = '(' PARAM* ')' '{' BODY* '}'
 */
 static CHECK_RESULT int parser_parse_function_decl(Parser *self, FunctionDecl **func_decl) {
     bool result;
@@ -101,7 +101,7 @@ static CHECK_RESULT int parser_parse_function_decl(Parser *self, FunctionDecl **
 }
 
 /*
-FUNC_CALL = IDENTIFIER '(' ARGS* ')'
+FUNC_CALL = IDENTIFIER '(' RHS* ')'
 */
 static CHECK_RESULT int parser_parse_function_call(Parser *self, FunctionCall **func_call) {
     bool result;
@@ -127,6 +127,7 @@ IMPORT = IMPORT_SYMBOL
 */
 static CHECK_RESULT int parser_parse_import(Parser *self, Import **import) {
     bool result;
+    *import = NULL;
 
     return_if_error(tokenizer_consume_if(&self->tokenizer, TOK_IMPORT, &result));
     if(!result)
@@ -138,20 +139,25 @@ static CHECK_RESULT int parser_parse_import(Parser *self, Import **import) {
 }
 
 /*
-RHS = FUNC_DECL | FUNC_CALL | IMPORT
+RHS = CLOSURE | FUNC_CALL | IMPORT
 */
 static CHECK_RESULT int parser_parse_rhs(Parser *self, Ast *rhs_expr) {
     FunctionDecl *func_decl;
     FunctionCall *func_call;
     Import *import;
+   /* bool result;*/
 
-    return_if_error(parser_parse_function_decl(self, &func_decl));
-    if(func_decl) {
-        rhs_expr->type = AST_FUNCTION_DECL;
-        rhs_expr->value.func_decl = func_decl;
+/*
+    return_if_error(tokenizer_consume_if(&self->tokenizer, TOK_STRING, &result));
+    if(result) {
+        String *string;
+        return_if_error(scoped_allocator_alloc(self->allocator, sizeof(String), (void**)&string));
+        string_init(string, self->tokenizer.value.string);
+        rhs_expr->type = AST_STRING;
+        rhs_expr->value.string = func_call;
         return PARSER_OK;
     }
-
+*/
     return_if_error(parser_parse_function_call(self, &func_call));
     if(func_call) {
         rhs_expr->type = AST_FUNCTION_CALL;
@@ -159,6 +165,13 @@ static CHECK_RESULT int parser_parse_rhs(Parser *self, Ast *rhs_expr) {
         return PARSER_OK;
     }
 
+    return_if_error(parser_parse_function_decl(self, &func_decl));
+    if(func_decl) {
+        rhs_expr->type = AST_FUNCTION_DECL;
+        rhs_expr->value.func_decl = func_decl;
+        return PARSER_OK;
+    }
+
     return_if_error(parser_parse_import(self, &import));
     if(import) {
         rhs_expr->type = AST_IMPORT;
diff --git a/src/tokenizer.c b/src/tokenizer.c
index 742f9ca..b9f0ad3 100644
--- a/src/tokenizer.c
+++ b/src/tokenizer.c
@@ -25,6 +25,8 @@ int tokenizer_init(Tokenizer *self, BufferView code, BufferView code_name) {
     self->index = 0;
     self->prev_index = 0;
     self->line = 1;
+    self->token = TOK_NONE;
+    self->needs_update = bool_true;
     self->code_name = code_name.data ? code_name : create_buffer_view("<buffer>", 8);
     return 0;
 }
@@ -49,10 +51,12 @@ static Token tokenizer_skip_whitespace(Tokenizer *self) {
             case '\t':
                 break;
             default:
+                self->prev_index = self->index;
                 return TOK_NONE;
         }
         ++self->index;
     }
+    self->prev_index = self->index;
 }
 
 /* Returns -1 if end of string can't be found */
@@ -73,7 +77,9 @@ static int find_end_of_string(BufferView buf, int index) {
     return -1;
 }
 
-int tokenizer_next(Tokenizer *self, Token *token) {
+static CHECK_RESULT int tokenizer_next(Tokenizer *self, Token *token);
+
+static CHECK_RESULT int __tokenizer_next(Tokenizer *self, Token *token) {
     Token last_token;
     int c;
     int result;
@@ -84,7 +90,6 @@ int tokenizer_next(Tokenizer *self, Token *token) {
         return TOKENIZER_OK;
     }
 
-    self->prev_index = self->index;
     c = tokenizer_get_char(self);
     if(isAlpha(c) || c == '_') {
         int identifier_start;
@@ -181,11 +186,21 @@ int tokenizer_next(Tokenizer *self, Token *token) {
     return TOKENIZER_OK;
 }
 
+/* Wrapper around __tokenizer_next to store last parsed token */
+int tokenizer_next(Tokenizer *self, Token *token) {
+    int result;
+    result = __tokenizer_next(self, token);
+    self->token = *token;
+    return result;
+}
+
 int tokenizer_accept(Tokenizer *self, Token expected_token) {
     Token actual_token;
     return_if_error(tokenizer_next(self, &actual_token));
-    if(actual_token == expected_token)
+    if(actual_token == expected_token) {
+        self->needs_update = bool_true;
         return TOKENIZER_OK;
+    }
 
     /* Todo: convert token to string */
     tokenizer_print_error(self, "Expected %d, got %d", expected_token, actual_token);
@@ -193,19 +208,21 @@ int tokenizer_accept(Tokenizer *self, Token expected_token) {
 }
 
 int tokenizer_consume_if(Tokenizer *self, Token expected_token, bool *result) {
-    int index;
-    int line;
     Token actual_token;
 
-    index = self->index;
-    line = self->line;
+    if(!self->needs_update) {
+        *result = (self->token == expected_token);
+        if(*result)
+            self->needs_update = bool_true;
+        return TOKENIZER_OK;
+    }
+
     return_if_error(tokenizer_next(self, &actual_token));
     if(actual_token == expected_token) {
+        self->needs_update = bool_true;
         *result = bool_true;
     } else {
-        self->index = index;
-        self->prev_index = index;
-        self->line = line;
+        self->needs_update = bool_false;
         *result = bool_false;
     }
     return TOKENIZER_OK;
-- 
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