some error handling

.idea/.gitignore

@@ -0,0 +1,8 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml

.idea/clox.iml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$" />
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

.idea/misc.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectRootManager" version="2" project-jdk-name="24" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>

.idea/modules.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/clox.iml" filepath="$PROJECT_DIR$/.idea/clox.iml" />
+    </modules>
+  </component>
+</project>

.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>

makefile

@@ -11,7 +11,7 @@ $(TARGET)/lox: $(TARGET)/lox.c.o $(TARGET)/tokens.c.o
 $(TARGET)/tokens.c.o: $(SRC)/tokens.c
 	$(CC) $< -o $@
 
-$(TARGET)/lox.c.o: $(SRC)/lox.c
+$(TARGET)/lox.c.o: $(SRC)/lox.c $(TARGET)
 	$(CC) $< -o $@
 
 $(TARGET):
@@ -19,4 +19,3 @@ $(TARGET):
 
 clean:
 	rm -rf $(TARGET)/*
-

src/lox.c

@@ -77,13 +77,13 @@ void run_prompt(void){
             break;
         }
 
-        run(line);
+        int len =(int)strlen(line);
+        run(substring(line, 1, len-1));
         had_error = false;
     }
 }
 
 void run(char* source){
-    printf("%s", source);
     scan_tokens(source);
 }
 
@@ -94,8 +94,9 @@ void scan_tokens(char* source){
 
     TokenList token_list;
     tokenlist_init(&token_list);
+    int len = (int)strlen(source);
 
-    while (current < (int)strlen(source)) {
+    while (current < len) {
         start = current;
         scan_token(source, line, start, &current, &token_list);
     }
@@ -112,9 +113,15 @@ void add_token(char* source, int line, TokenList* token_list, enum TokenType typ
     tokenlist_add(token_list, token);
 }
 
+void advance(int* pos){
+    (*pos) +=1;
+}
+
 void scan_token(char* source, int line, int start, int* current_pos, TokenList* token_list){
     char c = source[*current_pos];
-    (*current_pos) += 1;
+
+    advance(current_pos);
+
     switch (c){
         case '(': add_token(source, line, token_list, LEFT_PAREN, start, *current_pos); break;
         case ')': add_token(source, line, token_list, RIGHT_PAREN, start, *current_pos); break;
@@ -123,8 +130,9 @@ void scan_token(char* source, int line, int start, int* current_pos, TokenList*
         case ',': add_token(source, line, token_list, COMMA, start, *current_pos); break;
         case '.': add_token(source, line, token_list, DOT, start, *current_pos); break;
         case '+': add_token(source, line, token_list, PLUS, start, *current_pos); break;
-        case ';': add_token(source, line, token_list, SEMICOLON, start, *current_pos); break;
+        case '-': add_token(source, line, token_list, MINUS, start, *current_pos); break;
-        case '/': add_token(source, line, token_list, SLASH, start, *current_pos); break;
+
+        default: error(line, "Unexpected character."); break;
     }
 }
 
@@ -133,7 +141,7 @@ void error(int line, char* message){
 }
 
 void report(int line, char* where, char* message){
-    printf("[Line %i] Error %s : %s\n", line, where, message);
+    printf("*[Line %i] Error %s : %s\n", line, where, message);
     had_error = true;
 }
 
@@ -145,7 +153,7 @@ char* substring(char* string, int position, int length){
     }
 
     int c;
-    for (c=0; c< length; c++){
+    for (c=0; c < length; c+=1){
         *(ptr+c) = *(string+position-1);
         string += sizeof(char);
     }
@@ -153,4 +161,3 @@ char* substring(char* string, int position, int length){
 
     return ptr;
 }
-    

src/tokens.c

@@ -74,10 +74,10 @@ Token* tokenlist_get(TokenList* list, int index){
 void tokenlist_print(TokenList* tokenlist){
     for (int i=0; i< tokenlist->size; i++){
         printf("%s, ", token_name(tokenlist_get(tokenlist, i)));
+        printf("\n");
     }
 }
 
 void tokenlist_free(TokenList* list){
     free(list->tokens);
 }
-