Fix the assumption that the stack only has infix operators.

include/interpreter.h

@@ -28,6 +28,14 @@ struct libab_interpreter_s {
      * The unit value, which doesn't need more than one instance.
      */
     libab_ref value_unit;
+    /**
+     * The "true" boolean value, which doesn't need more than one instance.
+     */
+    libab_ref value_true;
+    /**
+     * The "false" boolean value, which doesn't need more than one instance.
+     */
+    libab_ref value_false;
 };
 
 typedef enum libab_interpreter_scope_mode_e libab_interpreter_scope_mode;
@@ -73,6 +81,18 @@ libab_result libab_interpreter_run_function(libab_interpreter* intr,
  * @param into the reference into which to store the unit value.
  */
 void libab_interpreter_unit_value(libab_interpreter* intr, libab_ref* into);
+/**
+ * Gets the true value from this interpreter.
+ * @param intr the interpreter from which to get the true value.
+ * @param into the reference into which to store the true value.
+ */
+void libab_interpreter_true_value(libab_interpreter* intr, libab_ref* into);
+/**
+ * Gets the false value from this interpreter.
+ * @param intr the interpreter from which to get the false value.
+ * @param into the reference into which to store the false value.
+ */
+void libab_interpreter_false_value(libab_interpreter* intr, libab_ref* into);
 /**
  * Frees the given interpreter.
  * @param intr the interpreter to free.

include/lexer.h

@@ -60,6 +60,8 @@ enum libab_lexer_token_e {
     TOKEN_OP_PREFIX,
     TOKEN_OP_POSTFIX,
     TOKEN_OP_RESERVED,
+    TOKEN_KW_TRUE,
+    TOKEN_KW_FALSE,
     TOKEN_KW_IF,
     TOKEN_KW_ELSE,
     TOKEN_KW_WHILE,

include/libabacus.h

@@ -204,6 +204,18 @@ void libab_get_type_unit(libab* ab, libab_ref* into);
  * @param into the reference into which to store the unit value.
  */
 void libab_get_unit_value(libab* ab, libab_ref* into);
+/**
+ * Gets the true value form this libab instance.
+ * @param ab the instance to get the true value from.
+ * @param into the reference into which to store the true value.
+ */
+void libab_get_true_value(libab* ab, libab_ref* into);
+/**
+ * Gets the false value form this libab instance.
+ * @param ab the instance to get the false value from.
+ * @param into the reference into which to store the false value.
+ */
+void libab_get_false_value(libab* ab, libab_ref* into);
 
 /**
  * Executes the given string of code.

include/tree.h

@@ -19,6 +19,8 @@ enum libab_tree_variant_e {
     TREE_POSTFIX_OP,
     TREE_BLOCK,
     TREE_VOID,
+    TREE_TRUE,
+    TREE_FALSE,
     TREE_IF,
     TREE_WHILE,
     TREE_DOWHILE,

src/interactive.c

@@ -7,6 +7,10 @@
 #define TRY(expression)                                                        \
     if (result == LIBAB_SUCCESS)                                               \
         result = expression;
+#define FUNCTION(name)                                                         \
+    libab_result function_##name (libab* ab, libab_ref* scope,                 \
+        libab_ref_vec* params, libab_ref* into)
+    
 #define INTERACTIONS 5
 
 void* impl_parse(const char* string) {
@@ -38,34 +42,59 @@ libab_result create_double_value(libab* ab, double val, libab_ref* into) {
     return result;
 }
 
-libab_result function_atan(libab* ab, libab_ref* scope, libab_ref_vec* params, libab_ref* into) {
+void get_boolean_value(libab* ab, int val, libab_ref* into) {
+    val ? libab_get_true_value(ab, into) : libab_get_false_value(ab, into);
+}
+
+FUNCTION(and) {
+    int* left = libab_unwrap_param(params, 0);
+    int* right = libab_unwrap_param(params, 1);
+    get_boolean_value(ab, *left & *right, into);
+    return LIBAB_SUCCESS;
+}
+
+FUNCTION(or) {
+    int* left = libab_unwrap_param(params, 0);
+    int* right = libab_unwrap_param(params, 1);
+    get_boolean_value(ab, *left | *right, into);
+    return LIBAB_SUCCESS;
+}
+
+FUNCTION(xor) {
+    int* left = libab_unwrap_param(params, 0);
+    int* right = libab_unwrap_param(params, 1);
+    get_boolean_value(ab, *left ^ *right, into);
+    return LIBAB_SUCCESS;
+}
+
+FUNCTION(atan) {
     printf("atan called\n");
     double* val = libab_unwrap_param(params, 0);
     return create_double_value(ab, atan(*val), into);
 }
 
-libab_result function_atan2(libab* ab, libab_ref* scope, libab_ref_vec* params, libab_ref* into) {
+FUNCTION(atan2) {
     printf("atan2 called\n");
     double* left = libab_unwrap_param(params, 0);
     double* right = libab_unwrap_param(params, 1);
     return create_double_value(ab, atan2(*left, *right), into);
 }
 
-libab_result function_print_num(libab* ab, libab_ref* scope, libab_ref_vec* params, libab_ref* into) {
+FUNCTION(print_num) {
     double* param = libab_unwrap_param(params, 0);
     printf("%f\n", *param);
     libab_get_unit_value(ab, into);
     return LIBAB_SUCCESS;
 }
 
-libab_result function_print_bool(libab* ab, libab_ref* scope, libab_ref_vec* params, libab_ref* into) {
+FUNCTION(print_bool) {
     int* param = libab_unwrap_param(params, 0);
     printf("%s\n", *param ? "true" : "false");
     libab_get_unit_value(ab, into);
     return LIBAB_SUCCESS;
 }
 
-libab_result function_print_unit(libab* ab, libab_ref* scope, libab_ref_vec* params, libab_ref* into) {
+FUNCTION(print_unit) {
     printf("()\n");
     libab_get_unit_value(ab, into);
     return LIBAB_SUCCESS;
@@ -96,6 +125,7 @@ libab_result register_functions(libab* ab) {
     libab_ref print_num_type;
     libab_ref print_unit_type;
     libab_ref print_bool_type;
+    libab_ref bool_logic_type;
 
     result = libab_create_type(ab, &trig_type, "(num)->num");
     TRY(libab_create_type(ab, &atan2_type, "(num, num)->num"));
@@ -103,6 +133,7 @@ libab_result register_functions(libab* ab) {
     TRY(libab_create_type(ab, &print_num_type, "(num)->unit"));
     TRY(libab_create_type(ab, &print_unit_type, "(unit)->unit"));
     TRY(libab_create_type(ab, &print_bool_type, "(bool)->unit"));
+    TRY(libab_create_type(ab, &bool_logic_type, "(bool,bool)->bool"));
 
     TRY(libab_register_function(ab, "atan", &trig_type, function_atan));
     TRY(libab_register_function(ab, "atan2", &atan2_type, function_atan2));
@@ -110,6 +141,9 @@ libab_result register_functions(libab* ab) {
     TRY(libab_register_function(ab, "minus", &atan2_type, function_minus));
     TRY(libab_register_function(ab, "times", &atan2_type, function_times));
     TRY(libab_register_function(ab, "divide", &atan2_type, function_divide));
+    TRY(libab_register_function(ab, "and", &bool_logic_type, function_and));
+    TRY(libab_register_function(ab, "or", &bool_logic_type, function_or));
+    TRY(libab_register_function(ab, "xor", &bool_logic_type, function_xor));
     TRY(libab_register_function(ab, "print", &print_num_type, function_print_num));
     TRY(libab_register_function(ab, "print", &print_unit_type, function_print_unit));
     TRY(libab_register_function(ab, "print", &print_bool_type, function_print_bool));
@@ -117,6 +151,9 @@ libab_result register_functions(libab* ab) {
     TRY(libab_register_operator_infix(ab, "-", 0, -1, "minus"));
     TRY(libab_register_operator_infix(ab, "*", 1, -1, "times"));
     TRY(libab_register_operator_infix(ab, "/", 1, -1, "divide"));
+    TRY(libab_register_operator_infix(ab, "&", 1, -1, "and"));
+    TRY(libab_register_operator_infix(ab, "|", 1, -1, "or"));
+    TRY(libab_register_operator_infix(ab, "^", 1, -1, "xor"));
 
     libab_ref_free(&trig_type);
     libab_ref_free(&atan2_type);
@@ -144,6 +181,10 @@ libab_result loop(libab* ab, int interaction_count, libab_ref* scope) {
             printf("Invalid input (error code %d).\n", eval_result);
         } else {
             result = libab_run_function_scoped(ab, "print", scope, &call_into, 1, &eval_into);
+            if(result == LIBAB_BAD_CALL) {
+                printf("(?)\n");
+                result = LIBAB_SUCCESS;
+            }
             libab_ref_free(&call_into);
         }
         libab_ref_free(&eval_into);

src/interpreter.c

@@ -4,15 +4,52 @@
 #include "free_functions.h"
 #include "reserved.h"
 
+libab_result _create_bool_value(libab* ab, int val, libab_ref* into) {
+    libab_ref type_bool;
+    int* new_bool;
+    libab_result result = LIBAB_SUCCESS;
+
+    libab_get_type_bool(ab, &type_bool);
+    new_bool = malloc(sizeof(*new_bool));
+    if(new_bool) {
+        *new_bool = val;
+        result = libab_create_value_raw(into, new_bool, &type_bool);
+        if(result != LIBAB_SUCCESS) {
+            free(new_bool);
+        }
+    } else {
+        result = LIBAB_MALLOC;
+        libab_ref_null(into);
+    }
+    libab_ref_free(&type_bool);
+    return result;
+}
+
 libab_result libab_interpreter_init(libab_interpreter* intr, libab* ab) {
     libab_result result;
     libab_ref unit_data;
     intr->ab = ab;
+    libab_ref_null(&intr->value_true);
+    libab_ref_null(&intr->value_false);
 
     libab_ref_null(&unit_data);
     result = libab_create_value_ref(&intr->value_unit, &unit_data, &ab->type_unit);
+    if(result == LIBAB_SUCCESS) {
+        libab_ref_free(&intr->value_true);
+        result = _create_bool_value(ab, 1, &intr->value_true);
+    }
+    if(result == LIBAB_SUCCESS) {
+        libab_ref_free(&intr->value_false);
+        result = _create_bool_value(ab, 0, &intr->value_false);
+    }
     libab_ref_free(&unit_data);
 
+    if(result != LIBAB_SUCCESS) {
+        libab_ref_free(&intr->value_unit);
+        libab_ref_free(&intr->value_true);
+        libab_ref_free(&intr->value_false);
+    }
+
     return result;
 }
 
@@ -1171,6 +1208,32 @@ libab_result _interpreter_run(struct interpreter_state* state, libab_tree* tree,
                 vec_index(&tree->children, 0),
                 vec_index(&tree->children, 1),
                 into);
+    } else if(tree->variant == TREE_TRUE) {
+        libab_get_true_value(state->ab, into);
+    } else if(tree->variant == TREE_FALSE) {
+        libab_get_false_value(state->ab, into);
+    } else if (tree->variant == TREE_IF) {
+        libab_ref condition;
+        libab_value* condition_value;
+        libab_parsetype* condition_type;
+        result = _interpreter_run(state, vec_index(&tree->children, 0),
+                &condition, scope, SCOPE_NORMAL);
+
+        if(result == LIBAB_SUCCESS) {
+            condition_value = libab_ref_get(&condition);
+            condition_type = libab_ref_get(&condition_value->type);
+            if(condition_type->data_u.base != libab_get_basetype_bool(state->ab)) {
+                result = LIBAB_MISMATCHED_TYPE;
+            }
+        }
+
+        if(result == LIBAB_SUCCESS) {
+            int* boolean = libab_ref_get(&condition_value->data);
+            result = _interpreter_run(state, vec_index(&tree->children,
+                        *boolean ? 1 : 2), into, scope, SCOPE_NORMAL);
+        }
+
+        libab_ref_free(&condition);
     } else {
         libab_get_unit_value(state->ab, into);
     }
@@ -1225,6 +1288,16 @@ void libab_interpreter_unit_value(libab_interpreter* intr, libab_ref* into) {
     libab_ref_copy(&intr->value_unit, into);
 }
 
+void libab_interpreter_true_value(libab_interpreter* intr, libab_ref* into) {
+    libab_ref_copy(&intr->value_true, into);
+}
+
+void libab_interpreter_false_value(libab_interpreter* intr, libab_ref* into) {
+    libab_ref_copy(&intr->value_false, into);
+}
+
 void libab_interpreter_free(libab_interpreter* intr) {
     libab_ref_free(&intr->value_unit);
+    libab_ref_free(&intr->value_true);
+    libab_ref_free(&intr->value_false);
 }

src/lexer.c

@@ -10,6 +10,8 @@ libab_result libab_lexer_init(libab_lexer* lexer) {
     const char* words[] = {".",
                            "[a-zA-Z][a-zA-Z0-9_]*",
                            "[0-9]+(\\.[0-9]*)?",
+                           "true",
+                           "false",
                            "if",
                            "else",
                            "while",
@@ -18,9 +20,9 @@ libab_result libab_lexer_init(libab_lexer* lexer) {
                            "fun",
                            "return"};
     libab_lexer_token tokens[] = {
-        TOKEN_CHAR,    TOKEN_ID,        TOKEN_NUM,    TOKEN_KW_IF,
-        TOKEN_KW_ELSE, TOKEN_KW_WHILE,  TOKEN_KW_DO,  TOKEN_KW_ARROW,
-        TOKEN_KW_FUN,  TOKEN_KW_RETURN };
+        TOKEN_CHAR,     TOKEN_ID,       TOKEN_NUM,     TOKEN_KW_TRUE,
+        TOKEN_KW_FALSE, TOKEN_KW_IF,    TOKEN_KW_ELSE, TOKEN_KW_WHILE,
+        TOKEN_KW_DO,    TOKEN_KW_ARROW, TOKEN_KW_FUN,  TOKEN_KW_RETURN};
     const size_t count = sizeof(tokens) / sizeof(libab_lexer_token);
 
     eval_config_init(&lexer->config);

src/libabacus.c

@@ -87,7 +87,9 @@ libab_result libab_init(libab* ab, void* (*parse_function)(const char*),
 void _sanitize(char* to, const char* from, size_t buffer_size) {
     size_t index = 0;
     while (*from && index < (buffer_size - 2)) {
-        if (*from == '+' || *from == '*' || *from == '\\')
+        if (*from == '+' || *from == '*' || *from == '\\' ||
+                *from == '|' || *from == '[' || *from == ']' || *from == '(' ||
+                *from == ')')
             to[index++] = '\\';
         to[index++] = *(from++);
     }
@@ -402,6 +404,14 @@ void libab_get_unit_value(libab* ab, libab_ref* into) {
     libab_interpreter_unit_value(&ab->intr, into);
 }
 
+void libab_get_true_value(libab* ab, libab_ref* into) {
+    libab_interpreter_true_value(&ab->intr, into);
+}
+
+void libab_get_false_value(libab* ab, libab_ref* into) {
+    libab_interpreter_false_value(&ab->intr, into);
+}
+
 libab_result _create_tree(libab* ab, const char* string, libab_tree** into) {
     libab_result result = LIBAB_SUCCESS;
     ll tokens;

src/parser.c

@@ -406,6 +406,38 @@ libab_result _parse_void(struct parser_state* state, libab_tree** store_into) {
     return result;
 }
 
+libab_result _parse_true(struct parser_state* state, libab_tree** store_into) {
+    libab_result result = _parser_consume_type(state, TOKEN_KW_TRUE);
+    if(result == LIBAB_SUCCESS) {
+        if ((*store_into = malloc(sizeof(**store_into)))) {
+            (*store_into)->variant = TREE_TRUE;
+        } else {
+            result = LIBAB_MALLOC;
+        }
+    }
+
+    if(result != LIBAB_SUCCESS) {
+        *store_into = NULL;
+    }
+    return result;
+}
+
+libab_result _parse_false(struct parser_state* state, libab_tree** store_into) {
+    libab_result result = _parser_consume_type(state, TOKEN_KW_FALSE);
+    if(result == LIBAB_SUCCESS) {
+        if ((*store_into = malloc(sizeof(**store_into)))) {
+            (*store_into)->variant = TREE_FALSE;
+        } else {
+            result = LIBAB_MALLOC;
+        }
+    }
+
+    if(result != LIBAB_SUCCESS) {
+        *store_into = NULL;
+    }
+    return result;
+}
+
 libab_result _parse_if(struct parser_state* state, libab_tree** store_into) {
     libab_result result = LIBAB_SUCCESS;
     libab_tree* condition = NULL;
@@ -736,6 +768,10 @@ libab_result _parse_atom(struct parser_state* state, libab_tree** store_into) {
         result = _parse_fun(state, store_into);
     } else if (_parser_is_type(state, TOKEN_KW_RETURN)) {
         result = _parse_return(state, store_into);
+    } else if (_parser_is_type(state, TOKEN_KW_TRUE)) {
+        result = _parse_true(state, store_into);
+    } else if (_parser_is_type(state, TOKEN_KW_FALSE)) {
+        result = _parse_false(state, store_into);
     } else {
         result = LIBAB_UNEXPECTED;
     }
@@ -1019,11 +1055,13 @@ libab_result _parse_expression(struct parser_state* state,
 
             while (result == LIBAB_SUCCESS && op_stack.tail &&
                    _parser_match_is_op(op_stack.tail->data)) {
-                _parser_find_operator_infix(state, op_stack.tail->data,
-                                            &other_operator);
+                libab_lexer_match* other_token = op_stack.tail->data;
+                if(other_token->type == TOKEN_OP_INFIX) {
+                    _parser_find_operator_infix(state, op_stack.tail->data,
+                            &other_operator);
+                }
 
-                if (((libab_lexer_match*)op_stack.tail->data)->type ==
-                        TOKEN_OP_PREFIX ||
+                if (other_token->type == TOKEN_OP_PREFIX ||
                     (operator.associativity == - 1 &&
                      operator.precedence <= other_operator.precedence) ||
                     (operator.associativity == 1 &&