Initial project import

tools/v/vlib/math/big/json_custom.v

@@ -0,0 +1,35 @@
+module big
+
+// from_json_number implements a custom decoder for json2
+pub fn (mut result Integer) from_json_number(raw_number string) ! {
+	mut index := 0
+	mut is_negative := false
+
+	if raw_number[0] == `-` {
+		is_negative = true
+		index++
+	}
+
+	ten := integer_from_int(10)
+
+	for index < raw_number.len {
+		digit := raw_number[index] - `0`
+
+		if digit > 9 { // comma, e and E are all smaller 0 in ASCII so they underflow
+			return error('expected integer but got real number')
+		}
+
+		result = (result * ten) + integer_from_int(int(digit))
+
+		index++
+	}
+
+	if is_negative {
+		result = result * integer_from_int(-1)
+	}
+}
+
+// to_json implements a custom encoder for json2
+pub fn (result Integer) to_json() string {
+	return result.str()
+}