From ecc06c082036aa93f6810ec21e73610c55f5a57b Mon Sep 17 00:00:00 2001
From: Elias Fleckenstein <eliasfleckenstein@web.de>
Date: Thu, 30 Dec 2021 14:18:15 +0100
Subject: Initial commit

---
 std/int.c | 134 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 134 insertions(+)
 create mode 100644 std/int.c

(limited to 'std/int.c')

diff --git a/std/int.c b/std/int.c
new file mode 100644
index 0000000..a8d2c6d
--- /dev/null
+++ b/std/int.c
@@ -0,0 +1,134 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include "../src/err.h"
+#include "../api/vm.h"
+#include "../api/int.h"
+#include "../api/bool.h"
+
+typedef enum
+{
+	BOP_SUB,
+	BOP_DIV,
+	BOP_MOD,
+	BOP_SML,
+	BOP_GRT,
+	BOP_EQU,
+} BinaryOP;
+
+static int binary(const char *fnname, UwUVMArgs *args, BinaryOP op)
+{
+	if (args->num != 2)
+		error("error: %s requires exactly 2 arguments\n", fnname);
+
+	UwUVMValue value0 = uwuvm_get_arg(args, 0);
+
+	if (value0.type != VT_INT)
+		error("error: %s requires an integer as $0\n", fnname);
+
+	UwUVMValue value1 = uwuvm_get_arg(args, 1);
+
+	if (value1.type != VT_INT)
+		error("error: %s requires an integer as $1\n", fnname);
+
+	int a = value0.value.int_value;
+	int b = value1.value.int_value;
+
+	switch (op) {
+		case BOP_SUB: return a - b;
+		case BOP_DIV: return a / b;
+		case BOP_MOD: return a % b;
+		case BOP_SML: return a < b;
+		case BOP_GRT: return a > b;
+		case BOP_EQU: return a == b;
+	}
+}
+
+typedef enum
+{
+	ROP_ADD,
+	ROP_MUL,
+	ROP_EQU,
+} ReduceOP;
+
+static int reduce(const char *fnname, UwUVMArgs *args, ReduceOP op, int result)
+{
+	int first;
+
+	for (size_t i = 0; i < args->num; i++) {
+		UwUVMValue value = uwuvm_get_arg(args, i);
+	
+		if (value.type != VT_INT)
+			error("error: %s only accepts integers as arguments (invalid argument: $%lu)\n", fnname, i);
+
+		int this = value.value.int_value;
+
+		switch (op) {
+			case ROP_ADD: result += this; break;
+			case ROP_MUL: result *= this; break;
+			case ROP_EQU:
+				if (i == 0)
+					first = this;
+				else if (this != first)
+					return 0;
+
+				break;
+		}
+	}
+
+	return result;
+}
+
+UwUVMValue uwu_add(UwUVMArgs *args)
+{
+	return uwuint_create(reduce(":int:mul", args, ROP_ADD, 0));
+}
+
+UwUVMValue uwu_sub(UwUVMArgs *args)
+{
+	return uwuint_create(binary(":int:sub", args, BOP_SUB));
+}
+
+UwUVMValue uwu_mul(UwUVMArgs *args)
+{
+	return uwuint_create(reduce(":int:mul", args, ROP_MUL, 1));	
+}
+
+UwUVMValue uwu_div(UwUVMArgs *args)
+{
+	return uwuint_create(binary(":int:div", args, BOP_DIV));
+}
+
+UwUVMValue uwu_mod(UwUVMArgs *args)
+{
+	return uwuint_create(binary(":int:mod", args, BOP_MOD));
+}
+
+UwUVMValue uwu_smaller(UwUVMArgs *args)
+{
+	return uwubool_create(binary(":int:smaller", args, BOP_SML) == 1);
+}
+
+UwUVMValue uwu_greater(UwUVMArgs *args)
+{
+	return uwubool_create(binary(":int:greater", args, BOP_GRT) == 1);
+}
+
+UwUVMValue uwu_equal(UwUVMArgs *args)
+{	
+	if (args->num < 2)
+		error("error: :int:equal requires at least 2 arguments\n");
+
+	return uwubool_create(reduce(":int:equal", args, ROP_EQU, 1) == 1);
+}
+
+UwUVMValue uwu_is(UwUVMArgs *args)
+{
+	if (args->num < 1)
+		error("error: :int:is requires at least 1 argument\n");
+
+	for (size_t i = 0; i < args->num; i++)
+		if (uwuvm_get_arg(args, i).type != VT_INT)
+			return uwubool_create(false);
+
+	return uwubool_create(true);
+}
-- 
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