+#include <assert.h>
+#include <inttypes.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+
{% for standard_library in standard_libraries %}
-#include<{{standard_library}}>
+#include <{{standard_library}}>
+{% endfor %}
+
+enum Type;
+typedef enum Type Type;
+union Instance;
+typedef union Instance Instance;
+struct Object;
+typedef struct Object Object;
+struct EnvironmentNode;
+typedef struct EnvironmentNode EnvironmentNode;
+struct Environment;
+typedef struct Environment Environment;
+
+const char* const STRING_LITERAL_LIST[] = {
+{% for string_literal in string_literal_list %}
+ "{{ string_literal }}",
+{% endfor %}
+};
+
+const char* const SYMBOL_LIST[] = {
+{% for symbol in symbol_list %}
+ "{{ symbol }}",
+{% endfor %}
+};
+
+enum Type
+{
+ BOOLEAN,
+ CLOSURE,
+ INTEGER,
+ STRING
+};
+
+union Instance
+{
+ bool boolean;
+ Object (*closure)(Environment*, size_t, Object*);
+ int32_t integer;
+ const char* string;
+};
+
+struct Object
+{
+ Type type;
+ Instance instance;
+};
+
+const Object TRUE = {
+ BOOLEAN,
+ { true }
+};
+
+const Object FALSE = {
+ BOOLEAN,
+ { false }
+};
+
+struct EnvironmentNode
+{
+ const char* key;
+ Object value;
+ EnvironmentNode* next;
+};
+
+struct Environment
+{
+ size_t referenceCount;
+ Environment* parent;
+ EnvironmentNode* root;
+};
+
+Environment* Environment_construct(Environment* parent)
+{
+ Environment* result = malloc(sizeof(Environment));
+ result->referenceCount = 1;
+ result->parent = parent;
+ result->root = NULL;
+ return result;
+}
+
+void Environment_destruct(Environment* self)
+{
+ self->referenceCount--;
+
+ if(self->referenceCount == 0)
+ {
+ EnvironmentNode* next;
+ for(EnvironmentNode* node = self->root; node != NULL; node = next)
+ {
+ // No objects are allocated on the heap (yet!) so we don't need to free anything else
+ next = node->next;
+ free(node);
+ }
+ free(self);
+ }
+}
+
+// This need not be thread safe because environments exist on one thread only
+void Environment_set(Environment* self, const char* const key, Object value)
+{
+ EnvironmentNode* node = malloc(sizeof(EnvironmentNode));
+ node->key = key;
+ node->value = value;
+ node->next = self->root;
+ self->root = node;
+}
+
+Object Environment_get(Environment* self, const char* const symbol)
+{
+ for(EnvironmentNode* node = self->root; node != NULL; node = node->next)
+ {
+ // We can compare pointers because pointers are unique in the SYMBOL_LIST
+ if(node->key == symbol)
+ {
+ return node->value;
+ }
+ }
+
+ if(self->parent != NULL)
+ {
+ return Environment_get(self->parent, symbol);
+ }
+
+ // TODO Handle symbol errors
+ assert(false);
+}
+
+Object integerLiteral(int32_t literal)
+{
+ Object result;
+ result.type = INTEGER;
+ result.instance.integer = literal;
+ return result;
+}
+
+Object stringLiteral(const char* literal)
+{
+ Object result;
+ result.type = STRING;
+ result.instance.string = literal;
+ return result;
+}
+
+// TODO Make this conditionally added
+Object operator$negate(Object input)
+{
+ assert(input.type == INTEGER);
+
+ Object result;
+ result.type = INTEGER;
+ result.instance.integer = -input.instance.integer;
+ return result;
+}
+
+{% for id in infix_declarations %}
+Object operator${{ id.name }}(Object left, Object right)
+{
+ assert(left.type == {{ id.in_type.upper() }});
+ assert(right.type == {{ id.in_type.upper() }});
+
+ Object result;
+ result.type = {{ id.out_type.upper() }};
+ result.instance.{{ id.out_type.lower() }} = left.instance.{{ id.in_type.lower() }} {{ id.operator }} right.instance.{{ id.in_type.lower() }};
+ return result;
+}
{% endfor %}
+{% if 'pow' in builtins %}
+Object builtin$pow$implementation(Environment* parent, size_t argc, Object* args)
+{
+ assert(argc == 2);
+
+ Object base = args[0];
+ Object exponent = args[1];
+
+ assert(base.type == INTEGER);
+ assert(exponent.type == INTEGER);
+
+ Object result;
+ result.type = INTEGER;
+ result.instance.integer = pow(base.instance.integer, exponent.instance.integer);
+ return result;
+}
+
+Object builtin$pow = { CLOSURE, (Instance)builtin$pow$implementation };
+{% endif %}
+
{% if 'print' in builtins %}
-void builtin$print(const char* output)
+Object builtin$print$implementation(Environment* parent, size_t argc, Object* args)
{
- printf("%s\n", output);
+ for(size_t i = 0; i < argc; i++)
+ {
+ Object output = args[i];
+ switch(output.type)
+ {
+ case BOOLEAN:
+ fputs(output.instance.boolean ? "true" : "false", stdout);
+ break;
+
+ case INTEGER:
+ printf("%" PRId32, output.instance.integer);
+ break;
+
+ case STRING:
+ // Using fwrite instead of printf to handle size_t length
+ printf("%s", output.instance.string);
+ break;
+
+ default:
+ assert(false);
+ }
+ }
+
+ // TODO Return something better
+ return FALSE;
}
+
+Object builtin$print = { CLOSURE, (Instance)builtin$print$implementation };
{% endif %}
+{% for function_definition in function_definition_list %}
+Object user${{function_definition.name}}$implementation(Environment* parent, size_t argc, Object* args)
+{
+ Environment* environment = Environment_construct(parent);
+
+ {% for statement in function_definition.statement_list[:-1] %}
+ {{ generate_statement(statement) }}
+ {% endfor %}
+
+ Object result = {{ generate_statement(function_definition.statement_list[-1]) }}
+ Environment_destruct(environment);
+ return result;
+}
+
+Object user${{function_definition.name}} = { CLOSURE, (Instance)user${{function_definition.name}}$implementation };
+{% endfor %}
+
int main(int argc, char** argv)
{
+ Environment* environment = Environment_construct(NULL);
+
+ // TODO Use the symbol from SYMBOL_LIST
+ {% for builtin in builtins %}
+ Environment_set(environment, "{{ builtin }}", builtin${{ builtin }});
+ {% endfor %}
+
{% for statement in statements %}
- {{ statement }}
+ {{ generate_statement(statement) }}
{% endfor %}
+
+ Environment_destruct(environment);
+
return 0;
}
projects / fur / blobdiff