From f5fc07765303055922e1dfcc35f2f2f620c1e66b Mon Sep 17 00:00:00 2001
From: dec05eba <dec05eba@protonmail.com>
Date: Tue, 14 Jan 2020 07:54:59 +0100
Subject: add parser...

---
 src/main.c      | 23 +++--------------------
 src/parser.c    | 39 +++++++++++++++++++++++++++++++++++++++
 src/tokenizer.c | 12 +++++++++++-
 3 files changed, 53 insertions(+), 21 deletions(-)
 create mode 100644 src/parser.c

(limited to 'src')

diff --git a/src/main.c b/src/main.c
index 6653ba2..04932d3 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,9 +1,7 @@
-#include "../include/tokenizer.h"
+#include "../include/parser.h"
 #include <string.h>
-#include <stdio.h>
 
 int main() {
-    TslTokenizer tokenizer;
     const char *code = 
 "value1 = 1\n"
 "value2 = true\n"
@@ -22,20 +20,5 @@ int main() {
 "\n"
 "str = value9[\"hello\"]\n"
 "value9[\"sayHello\"]()";
-    tsl_tokenizer_init(&tokenizer, code, strlen(code));
-    
-    for(;;) {
-        TslToken token = tsl_tokenizer_next(&tokenizer);
-        if(token == TSL_TOKEN_END_OF_FILE) {
-            break;
-        } else if(token == TSL_TOKEN_IDENTIFIER) {
-            printf("identifier: %.*s\n", (int)tokenizer.identifier.size, tokenizer.identifier.data);
-        } else if(token == TSL_TOKEN_NUM) {
-            printf("num: %ld\n", tokenizer.number_value);
-        } else {
-            return 1;
-        }
-    }
-
-    return 0;
-}
\ No newline at end of file
+    return tsl_parse(code, strlen(code));
+}
diff --git a/src/parser.c b/src/parser.c
new file mode 100644
index 0000000..35a4abb
--- /dev/null
+++ b/src/parser.c
@@ -0,0 +1,39 @@
+#include "../include/parser.h"
+#include <stdio.h>
+
+typedef struct {
+    TslTokenizer tokenizer;
+} TslParser;
+
+static void tsl_parser_init(TslParser *self, const char *code, size_t code_size) {
+    tsl_tokenizer_init(&self->tokenizer, code, code_size);
+}
+
+static int tsl_parser_parse_rhs(TslParser *self) {
+    return 0;
+}
+
+static int tsl_parser_parse(TslParser *self) {
+    for(;;) {
+        TslToken token = tsl_tokenizer_next(&self->tokenizer);
+        if(token == TSL_TOKEN_IDENTIFIER) {
+            TslStringView identifier = self->tokenizer.identifier;
+            if(!tsl_tokenizer_accept(&self->tokenizer, TSL_TOKEN_EQUAL)) {
+                return -1;
+            }
+            tsl_parser_parse_rhs(self);
+        } else if(token == TSL_TOKEN_END_OF_FILE) {
+            break;
+        } else {
+            fprintf(stderr, "Error: Expected identifier, got TODO\n");
+            return -1;
+        }
+    }
+    return 0;
+}
+
+int tsl_parse(const char *code, size_t code_size) {
+    TslParser parser;
+    tsl_parser_init(&parser, code, code_size);
+    return tsl_parser_parse(&parser);
+}
diff --git a/src/tokenizer.c b/src/tokenizer.c
index 1ab34db..97673f5 100644
--- a/src/tokenizer.c
+++ b/src/tokenizer.c
@@ -76,7 +76,8 @@ const int64_t num_multipliers[] = {
 /* TODO: Check if the number if too large to fit into the result */
 static int64_t string_to_int(TslStringView *str) {
     int64_t num = 0;
-    for(size_t i = 0; i < str->size; ++i) {
+    size_t i = 0;
+    for(; i < str->size; ++i) {
         char digit = str->data[str->size - 1 - i] - '0';
         num += digit * num_multipliers[i];
     }
@@ -146,3 +147,12 @@ TslToken tsl_tokenizer_next(TslTokenizer *self) {
         return TSL_TOKEN_UNEXPECTED_SYMBOL;
     }
 }
+
+int tsl_tokenizer_accept(TslTokenizer *self, TslToken expected_token) {
+    TslToken actual_token = tsl_tokenizer_next(self);
+    if(actual_token != expected_token) {
+        fprintf(stderr, "Error: Expected TODO, got TODO\n");
+        return 0;
+    }
+    return 1;
+}
-- 
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