From 255aa20f6d68a71c9eedd47998480a8b14a3be36 Mon Sep 17 00:00:00 2001
From: dec05eba <dec05eba@protonmail.com>
Date: Sat, 9 Mar 2019 11:37:23 +0100
Subject: Add single line, multiline comments

---
 src/ast.c       |  1 +
 src/tokenizer.c | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++------
 tests/main.amal |  5 ++++-
 3 files changed, 56 insertions(+), 7 deletions(-)

diff --git a/src/ast.c b/src/ast.c
index 2154531..5314e90 100644
--- a/src/ast.c
+++ b/src/ast.c
@@ -115,6 +115,7 @@ void scope_resolve(Scope *self) {
 
 static void lhs_resolve(LhsExpr *self) {
     amal_log_debug("Lhs resolve var name: %.*s", self->var_name.size, self->var_name.data);
+    /*ast_resolve(&self->rhs_expr);*/
 }
 
 void ast_resolve(Ast *self) {
diff --git a/src/tokenizer.c b/src/tokenizer.c
index 9077bb9..b2bd6c5 100644
--- a/src/tokenizer.c
+++ b/src/tokenizer.c
@@ -20,6 +20,11 @@ static int isAlphaDigit(int c) {
     return isAlpha(c) || isDigit(c);
 }
 
+static int tokenizer_get_start_of_line_from_index(Tokenizer *self, int index);
+static int tokenizer_get_end_of_line_from_index(Tokenizer *self, int index);
+/* Returns -1 if end of multiline comment was not found */
+static int tokenizer_get_end_of_multiline_comment(Tokenizer *self, int index);
+
 int tokenizer_init(Tokenizer *self, ScopedAllocator *allocator, BufferView code, BufferView code_name) {
     assert(code.size <= INT_MAX);
     self->code = code;
@@ -242,6 +247,23 @@ static CHECK_RESULT int __tokenizer_next(Tokenizer *self, Token *token) {
         SET_BINOP(BINOP_MUL);
     } else if(c == '/') {
         ++self->index;
+        if(self->index < (int)self->code.size) {
+            c = tokenizer_get_char(self);
+            /* Single line comment */
+            if(c == '/') {
+                ++self->index;
+                self->index = tokenizer_get_end_of_line_from_index(self, self->index);
+                return __tokenizer_next(self, token);
+            } else if(c == '*') {
+                ++self->index;
+                self->index = tokenizer_get_end_of_multiline_comment(self, self->index);
+                if(self->index == -1) {
+                    tokenizer_print_error(self, "End of multiline comment not found");
+                    return TOKENIZER_ERR;
+                }
+                return __tokenizer_next(self, token);
+            }
+        }
         SET_BINOP(BINOP_DIV);
     } else if(c == '=') {
         ++self->index;
@@ -503,10 +525,10 @@ int tokenizer_consume_if(Tokenizer *self, Token expected_token, bool *result) {
     return TOKENIZER_OK;
 }
 
-static int tokenizer_get_start_of_line_from_index(Tokenizer *self, int index) {
-    int c;
+int tokenizer_get_start_of_line_from_index(Tokenizer *self, int index) {
+    char c;
     while(index >= 0) {
-        c = self->code.data[(usize)index];
+        c = self->code.data[index];
         if(c == '\n' || c == '\r') {
             return index + 1;
         }
@@ -515,10 +537,10 @@ static int tokenizer_get_start_of_line_from_index(Tokenizer *self, int index) {
     return 0;
 }
 
-static int tokenizer_get_end_of_line_from_index(Tokenizer *self, int index) {
-    int c;
+int tokenizer_get_end_of_line_from_index(Tokenizer *self, int index) {
+    char c;
     while(index < (int)self->code.size) {
-        c = self->code.data[(usize)index];
+        c = self->code.data[index];
         if(c == '\n' || c == '\r')
             break;
         ++index;
@@ -526,6 +548,29 @@ static int tokenizer_get_end_of_line_from_index(Tokenizer *self, int index) {
     return index;
 }
 
+int tokenizer_get_end_of_multiline_comment(Tokenizer *self, int index) {
+    char c;
+    int comment_count;
+    comment_count = 1;
+
+    while(index < (int)self->code.size) {
+        c = self->code.data[index];
+        if(c == '*') {
+            if(index - 1 >= 0 && self->code.data[index - 1] == '/') {
+                ++comment_count;
+            }
+        } else if(c == '/') {
+            if(index - 1 >= 0 && self->code.data[index - 1] == '*') {
+                --comment_count;
+                if(comment_count == 0)
+                    return index + 1;
+            }
+        }
+        ++index;
+    }
+    return -1;
+}
+
 void tokenizer_print_error(Tokenizer *self, const char *fmt, ...) {
     va_list args;
     int line_start;
diff --git a/tests/main.amal b/tests/main.amal
index 786724c..cd0fc60 100644
--- a/tests/main.amal
+++ b/tests/main.amal
@@ -10,7 +10,10 @@ const main = fn {
     const num2 = 23232;
     const num3 = num1 + num2 * 30;
     const num4 = (num1 + num2) * num3 * ((34 + 32) / 234.345);
-    const num4 = 23;
+    //const num4 = 23;
+    /*
+    episfjpseifipesf
+    */
 }
 
 const print = fn {
-- 
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