Initial project import

tools/v/vlib/x/json2/count.v

@@ -0,0 +1,109 @@
+module json2
+
+import time
+
+struct Count {
+mut:
+	total int
+}
+
+// get_total
+fn (mut count Count) get_total() int {
+	return count.total
+}
+
+// reset_total
+fn (mut count Count) reset_total() {
+	count.total = 0
+}
+
+// count_chars count json sizen without new encode
+fn (mut count Count) count_chars[T](val T) {
+	$if val is $option {
+		workaround := val
+		if workaround != none {
+			count.count_chars(val)
+		}
+	} $else $if T is string {
+		count.chars_in_string(val)
+	} $else $if T is $sumtype {
+		$for v in val.variants {
+			if val is v {
+				count.count_chars(val)
+			}
+		}
+	} $else $if T is $alias {
+		// TODO
+	} $else $if T is time.Time {
+		count.total += 26 // "YYYY-MM-DDTHH:mm:ss.123Z"
+	} $else $if T is $map {
+		count.total++ // {
+		for k, v in val {
+			count.count_chars(k)
+			count.total++ // :
+			count.count_chars(v)
+		}
+		count.total++ // }
+	} $else $if T is $array {
+		count.total += 2 // []
+		if val.len > 0 {
+			for element in val {
+				count.count_chars(element)
+			}
+			count.total += val.len - 1 // ,
+		}
+	} $else $if T is $struct {
+		count.chars_in_struct(val)
+	} $else $if T is $enum {
+		mut enum_name := 'unknown enum value'
+		$for member in T.values {
+			if member.value == val {
+				enum_name = member.name
+				for attr in member.attrs {
+					if json_attr := json_attr_value(attr) {
+						enum_name = json_attr
+					}
+				}
+			}
+		}
+		count.total += enum_name.len + 2 // ""
+	} $else $if T is $int {
+		// TODO: benchmark
+		mut abs_val := val
+		if val < 0 {
+			count.total++ // -
+			abs_val = -val
+		}
+		for number_value := abs_val; number_value >= 1; number_value /= 10 {
+			count.total++
+		}
+		if val == 0 {
+			count.total++
+		}
+	} $else $if T is $float {
+		// TODO
+	} $else $if T is bool {
+		if val {
+			count.total += 4 // true
+		} else {
+			count.total += 5 // false
+		}
+	} $else {
+	}
+}
+
+// chars_in_struct
+fn (mut count Count) chars_in_struct[T](val T) {
+	count.total += 2 // {}
+	$for field in T.fields {
+		// TODO: handle attributes
+		count.total += field.name.len + 3 // "":
+		workaround := val.$(field.name)
+		count.count_chars(workaround)
+	}
+}
+
+// chars_in_string
+fn (mut count Count) chars_in_string(val string) {
+	count.total += val.len + 2 // ""
+}