Use the parse arguments

src/assert.c

@@ -1,13 +1,6 @@
 void assert_type (Ast_Node* node, Ast_Node_Type type) {
+    if (!node)
+        create_error(Error_Type_Unknown_Error, node);
     if (node->type == type) return;
-
-    /* char *wanted, *got, *message; */
-    /* wanted = Ast_Node_Type_to_string(type); */
-    /* got = Ast_Node_Type_to_string(node->type); */
-    /* asprintf(&message, "Type assertion failed:\n\t" */
-    /*          "Wanted: %s\n\t" */
-    /*          "Got   : %s\n", wanted, got); */
-    /* panic(message); */
-
     create_error(Error_Type_Type_Missmatch, node);
 }

src/ast.c

@@ -134,6 +134,19 @@ struct Ast_Node {
 // was forward declarated
 typedef struct Ast_Node Ast_Node;
 
+typedef struct {
+    Ast_Node** data;
+    int length;
+    int next_index;
+} Ast_Node_Array_List;
+
+typedef struct {
+    Ast_Node_Array_List* positional_arguments;
+    // TODO(Felix): Really use hashmap (keyword[sting] ->
+    // value[Ast_Node*]) here
+    Ast_Node_Array_List* keyword_keys;
+    Ast_Node_Array_List* keyword_values;
+} Parsed_Arguments;
 
 Ast_Node* create_ast_node_nil() {
     Ast_Node* node = new(Ast_Node);

src/built_ins.c

@@ -39,84 +39,84 @@ bool ast_node_equal(Ast_Node* n1, Ast_Node* n2) {
     return false;
 }
 
-Ast_Node* built_in_equals(Ast_Node* operands) {
-    if (operands->type == Ast_Node_Type_Nil)
-        return create_ast_node_number(1);
-
-    Ast_Node* first = operands->value.pair->first;
-
-    while (operands->type == Ast_Node_Type_Pair) {
-        if (!ast_node_equal(operands->value.pair->first, first))
+Ast_Node* built_in_equals(Parsed_Arguments* arguments) {
+    for (int i = 0; i < arguments->positional_arguments->next_index-1; ++i) {
+        if (!ast_node_equal(
+                arguments->positional_arguments->data[i],
+                arguments->positional_arguments->data[i+1]))
             return create_ast_node_nil();
-        operands = operands->value.pair->rest;
     }
-
     return create_ast_node_number(1);
 }
 
-Ast_Node* built_in_add(Ast_Node* operands) {
+Ast_Node* built_in_add(Parsed_Arguments* arguments) {
     double sum = 0;
-    while (operands->type == Ast_Node_Type_Pair) {
+    for (int i = 0; i < arguments->positional_arguments->next_index; ++i) {
         try {
-            assert_type(operands->value.pair->first, Ast_Node_Type_Number);
+            assert_type(arguments->positional_arguments->data[i], Ast_Node_Type_Number);
         }
-        sum += operands->value.pair->first->value.number->value;
-        operands = operands->value.pair->rest;
+        sum += arguments->positional_arguments->data[i]->value.number->value;
     }
 
     return create_ast_node_number(sum);
 }
 
-Ast_Node* built_in_substract(Ast_Node* operands) {
+Ast_Node* built_in_substract(Parsed_Arguments* arguments) {
+    if (arguments->positional_arguments->next_index == 0)
+        return create_ast_node_number(0);
+
     try {
-        assert_type(operands->value.pair->first, Ast_Node_Type_Number);
+        assert_type(*arguments->positional_arguments->data, Ast_Node_Type_Number);
     }
-    double difference = operands->value.pair->first->value.number->value;
 
-    operands = operands->value.pair->rest;
-    while (operands->type == Ast_Node_Type_Pair) {
+    if (arguments->positional_arguments->next_index == 1) {
+        return create_ast_node_number(-(*arguments->positional_arguments->data)->value.number->value);
+    }
+
+    // okay we have at least 2 arguments
+    double difference = (*arguments->positional_arguments->data)->value.number->value;
+    for (int i = 1; i < arguments->positional_arguments->next_index; ++i) {
         try {
-            assert_type(operands->value.pair->first, Ast_Node_Type_Number);
+            assert_type(arguments->positional_arguments->data[i], Ast_Node_Type_Number);
         }
-
-        difference -= operands->value.pair->first->value.number->value;
-        operands = operands->value.pair->rest;
+        difference -= arguments->positional_arguments->data[i]->value.number->value;
     }
+
     return create_ast_node_number(difference);
 }
 
-Ast_Node* built_in_multiply(Ast_Node* operands) {
-    try {
-        assert_type(operands->value.pair->first, Ast_Node_Type_Number);
-    }
-    double product = operands->value.pair->first->value.number->value;
-
-    operands = operands->value.pair->rest;
-    while (operands->type == Ast_Node_Type_Pair) {
+Ast_Node* built_in_multiply(Parsed_Arguments* arguments) {
+    double product = 1;
+    for (int i = 0; i < arguments->positional_arguments->next_index; ++i) {
         try {
-            assert_type(operands->value.pair->first, Ast_Node_Type_Number);
+            assert_type(arguments->positional_arguments->data[i], Ast_Node_Type_Number);
         }
-
-        product *= operands->value.pair->first->value.number->value;
-        operands = operands->value.pair->rest;
+        product *= arguments->positional_arguments->data[i]->value.number->value;
     }
+
     return create_ast_node_number(product);
 }
 
-Ast_Node* built_in_divide(Ast_Node* operands) {
+Ast_Node* built_in_divide(Parsed_Arguments* arguments) {
+    if (arguments->positional_arguments->next_index == 0)
+        return create_ast_node_number(1);
+
     try {
-        assert_type(operands->value.pair->first, Ast_Node_Type_Number);
+        assert_type(*arguments->positional_arguments->data, Ast_Node_Type_Number);
     }
-    double quotient = operands->value.pair->first->value.number->value;
 
-    operands = operands->value.pair->rest;
-    while (operands->type == Ast_Node_Type_Pair) {
+    if (arguments->positional_arguments->next_index == 1) {
+        return create_ast_node_number((*arguments->positional_arguments->data)->value.number->value);
+    }
+
+    // okay we have at least 2 arguments
+    double difference = (*arguments->positional_arguments->data)->value.number->value;
+    for (int i = 1; i < arguments->positional_arguments->next_index; ++i) {
         try {
-            assert_type(operands->value.pair->first, Ast_Node_Type_Number);
+            assert_type(arguments->positional_arguments->data[i], Ast_Node_Type_Number);
         }
-
-        quotient /= operands->value.pair->first->value.number->value;
-        operands = operands->value.pair->rest;
+        difference /= arguments->positional_arguments->data[i]->value.number->value;
     }
-    return create_ast_node_number(quotient);
+
+    return create_ast_node_number(difference);
 }

src/error.c

@@ -2,6 +2,7 @@ typedef enum {
     Error_Type_Ill_Formed_List,
     Error_Type_Ill_Formed_Arguments,
     Error_Type_Wrong_Number_Of_Arguments,
+    Error_Type_Unknown_Keyword_Argument,
     Error_Type_Type_Missmatch,
     Error_Type_Symbol_Not_Defined,
     Error_Type_Not_A_Function,
@@ -39,6 +40,7 @@ char* Error_Type_to_string(Error_Type type) {
     switch (type) {
     case Error_Type_Ill_Formed_List:           return "Evaluation-error: Ill formed list";
     case Error_Type_Ill_Formed_Arguments:      return "Evaluation-error: Ill formed arguments";
+    case Error_Type_Unknown_Keyword_Argument:  return "Evaluation-error: Unknown keyword argument";
     case Error_Type_Not_A_Function:            return "Evaluation-error: Not a function";
     case Error_Type_Symbol_Not_Defined:        return "Evaluation-error: Symbol not defined";
     case Error_Type_Wrong_Number_Of_Arguments: return "Evaluation-error: Wrong number of arguments";

src/eval.c

@@ -56,14 +56,6 @@ Ast_Node* copy_list(Ast_Node* node) {
     return result;
 }
 
-typedef struct {
-    Ast_Node_Array_List* positional_arguments;
-    // TODO(Felix): Really use hashmap (keyword[sting] ->
-    // value[Ast_Node*]) here
-    Ast_Node_Array_List* keyword_keys;
-    Ast_Node_Array_List* keyword_values;
-} Parsed_Arguments;
-
 Parsed_Arguments* eval_and_parse_arguments(Ast_Node* arguments, Environment* env) {
     // TODO(Felix): if arguments is nil then maybe return a constant
     // Parsed_Arguments_nil?
@@ -114,6 +106,15 @@ Parsed_Arguments* eval_and_parse_arguments(Ast_Node* arguments, Environment* env
     return result;
 }
 
+Ast_Node* extract_keyword_value(char* keyword, Parsed_Arguments* args) {
+    // NOTE(Felix): This will be a hashmap lookup later
+    for (int i = 0; i < args->keyword_keys->next_index; ++i) {
+        if (string_equal(args->keyword_keys->data[i]->value.keyword->identifier, keyword))
+            return args->keyword_values->data[i];
+    }
+    return nullptr;
+}
+
 Ast_Node* eval_arguments(Ast_Node* arguments, Environment* env, int *out_arguments_length) {
     *out_arguments_length = 0;
     if (arguments->type == Ast_Node_Type_Nil) {
@@ -279,25 +280,27 @@ Ast_Node* eval_expr(Ast_Node* node, Environment* env) {
             // to evaluate the arguments; eval_arguments will also tell
             // us the arguments_length.
             Ast_Node* evaluated_arguments;
+            Parsed_Arguments* evaluated_and_parsed_arguments;
             try {
                 evaluated_arguments = eval_arguments(arguments, env, &arguments_length);
+                evaluated_and_parsed_arguments = eval_and_parse_arguments(arguments, env);
             }
 
             switch (operator->value.built_in_function->type) {
             case Built_In_Addition: {
-                return built_in_add(evaluated_arguments);
+                return built_in_add(evaluated_and_parsed_arguments);
             }
             case Built_In_Subtraction: {
-                return built_in_substract(evaluated_arguments);
+                return built_in_substract(evaluated_and_parsed_arguments);
             }
             case Built_In_Multiplication: {
-                return built_in_multiply(evaluated_arguments);
+                return built_in_multiply(evaluated_and_parsed_arguments);
             }
             case Built_In_Division: {
-                return built_in_divide(evaluated_arguments);
+                return built_in_divide(evaluated_and_parsed_arguments);
             }
             case Built_In_Equal: {
-                return built_in_equals(evaluated_arguments);
+                return built_in_equals(evaluated_and_parsed_arguments);
             }
             case Built_In_Pair: {
                 if (arguments_length != 2) {
@@ -355,12 +358,46 @@ Ast_Node* eval_expr(Ast_Node* node, Environment* env) {
                 return evaluated_arguments;
             }
             case Built_In_Print: {
-                if (arguments_length != 1) {
+                /* if (arguments_length != 1) { */
+                /*     report_error(Error_Type_Wrong_Number_Of_Arguments); */
+                /* } */
+                /* print(evaluated_arguments->value.pair->first); */
+                /* printf("\n"); */
+                /* return arguments->value.pair->first; */
+
+                if (evaluated_and_parsed_arguments->positional_arguments->next_index == 0) {
                     report_error(Error_Type_Wrong_Number_Of_Arguments);
                 }
-                print(evaluated_arguments->value.pair->first);
-                printf("\n");
-                return arguments->value.pair->first;
+
+                char* sep = " ";
+                char* end = "\n";
+
+                Ast_Node* temp = extract_keyword_value("sep", evaluated_and_parsed_arguments);
+                if (temp) {
+                    try {
+                        assert_type(temp, Ast_Node_Type_String);
+                    }
+                    sep = temp->value.string->value;
+                }
+
+                temp = extract_keyword_value("end", evaluated_and_parsed_arguments);
+                if (temp) {
+                    try {
+                        assert_type(temp, Ast_Node_Type_String);
+                    }
+                    end = temp->value.string->value;
+                }
+
+                print(*evaluated_and_parsed_arguments->positional_arguments->data);
+                for (int i = 1; i < evaluated_and_parsed_arguments->positional_arguments->next_index; ++i) {
+                    printf("%s", sep);
+                    print(*(evaluated_and_parsed_arguments->positional_arguments->data+i));
+                }
+                printf("%s", end);
+
+                // return last positional argument
+                return *(evaluated_and_parsed_arguments->positional_arguments->data+
+                         (evaluated_and_parsed_arguments->positional_arguments->next_index-1));
             }
             case Built_In_Read: {
                 if (arguments_length > 1) {
@@ -415,7 +452,7 @@ Ast_Node* eval_expr(Ast_Node* node, Environment* env) {
 
         }
 
-        // assume it's lambda function and evaluate the arguments 
+        // assume it's lambda function and evaluate the arguments
         arguments = eval_arguments(arguments, env, &arguments_length);
     }
 

src/init.c

@@ -0,0 +1,18 @@
+// for colored console output
+#ifdef _WIN32
+#include <windows.h>
+#pragma comment(lib, "Kernel32.lib")
+#endif
+
+void init () {
+    // On Windows: manually enable colored console output
+#ifdef _WIN32
+    SetConsoleMode(GetStdHandle(STD_OUTPUT_HANDLE),
+                   ENABLE_PROCESSED_OUTPUT |
+                   ENABLE_WRAP_AT_EOL_OUTPUT |
+                   ENABLE_VIRTUAL_TERMINAL_PROCESSING);
+#endif
+
+    // TODO(Felix): Init the constants here (Bulit-in function
+    // ast_nodes, nil, ..more?)
+}

src/main.c

@@ -15,6 +15,7 @@
 #include "./built_ins.c"
 #include "./eval.c"
 #include "./testing.c"
+#include "./init.c"
 
 int interprete_file (char* file_content) {
     Ast_Node_Array_List* program = parse_program(file_content);
@@ -62,8 +63,9 @@ int interprete_stdin () {
     return 0;
 }
 
-
 int main (int argc, char *argv[]) {
+    init();
+
     if (argc > 1) {
         char* file_content = read_entire_file(argv[1]);
         if (file_content) {

src/parse.c

@@ -1,9 +1,3 @@
-typedef struct {
-    Ast_Node** data;
-    int length;
-    int next_index;
-} Ast_Node_Array_List;
-
 Ast_Node_Array_List* create_Ast_Node_Array_List() {
     Ast_Node_Array_List* ret = new (Ast_Node_Array_List);