validate/rules.go

package validate

import (
	"reflect"
	"regexp"
	"strings"
)

type listFunc func(reflect.Value, interface{}) bool
type listFuncInfo struct {
	inputFunc func(reflect.Kind, string) interface{}
	kinds     _kinds
}

type _kinds map[reflect.Kind]listFunc

// nolint: dupl
var funcs = map[string]listFuncInfo{
	`required`: {nil, _kinds{
		reflect.Ptr: func(rv reflect.Value, _ interface{}) bool {
			return !rv.IsNil()
		},
		reflect.Interface: func(rv reflect.Value, _ interface{}) bool {
			return !rv.IsNil()
		},
		reflect.Slice: func(rv reflect.Value, _ interface{}) bool {
			return !rv.IsNil() && rv.Len() > 0
		},
		reflect.Map: func(rv reflect.Value, _ interface{}) bool {
			return !rv.IsNil() && rv.Len() > 0
		},
		reflect.String: func(rv reflect.Value, _ interface{}) bool {
			return rv.String() != ``
		},
		reflect.Int: func(rv reflect.Value, _ interface{}) bool {
			return rv.Int() != 0
		},
		reflect.Uint: func(rv reflect.Value, _ interface{}) bool {
			return rv.Uint() != 0
		},
		reflect.Float64: func(rv reflect.Value, _ interface{}) bool {
			return rv.Float() != 0
		},
	}},

	// Strings
	`prefix`: {inputSame, _kinds{
		reflect.String: func(rv reflect.Value, val interface{}) bool {
			return strings.HasPrefix(rv.String(), val.(string))
		},
	}},
	`suffix`: {inputSame, _kinds{
		reflect.String: func(rv reflect.Value, val interface{}) bool {
			return strings.HasSuffix(rv.String(), val.(string))
		},
	}},
	`contains`: {inputSame, _kinds{
		reflect.String: func(rv reflect.Value, val interface{}) bool {
			return strings.Contains(rv.String(), val.(string))
		},
	}},
	`regexp`: {inputRegexp, _kinds{
		reflect.String: func(rv reflect.Value, val interface{}) bool {
			return val.(*regexp.Regexp).MatchString(rv.String())
		},
	}},

	// Comparisons
	`eq`: {inputSame, _kinds{
		reflect.String: func(rv reflect.Value, val interface{}) bool {
			return rv.String() == val.(string)
		},
		reflect.Int: func(rv reflect.Value, val interface{}) bool {
			return rv.Int() == val.(int64)
		},
		reflect.Uint: func(rv reflect.Value, val interface{}) bool {
			return rv.Uint() == val.(uint64)
		},
		reflect.Float64: func(rv reflect.Value, val interface{}) bool {
			return rv.Float() == val.(float64)
		},
	}},

	// Integers
	`gt`: {inputSame, _kinds{
		reflect.Int: func(rv reflect.Value, val interface{}) bool {
			return rv.Int() > val.(int64)
		},
		reflect.Uint: func(rv reflect.Value, val interface{}) bool {
			return rv.Uint() > val.(uint64)
		},
		reflect.Float64: func(rv reflect.Value, val interface{}) bool {
			return rv.Float() > val.(float64)
		},
	}},
	`lt`: {inputSame, _kinds{
		reflect.Int: func(rv reflect.Value, val interface{}) bool {
			return rv.Int() < val.(int64)
		},
		reflect.Uint: func(rv reflect.Value, val interface{}) bool {
			return rv.Uint() < val.(uint64)
		},
		reflect.Float64: func(rv reflect.Value, val interface{}) bool {
			return rv.Float() < val.(float64)
		},
	}},

	// Slices, maps & strings
	`len`: {inputInt, _kinds{
		reflect.Slice: func(rv reflect.Value, val interface{}) bool {
			return rv.Len() == val.(int)
		},
		reflect.Map: func(rv reflect.Value, val interface{}) bool {
			return rv.Len() == val.(int)
		},
		reflect.String: func(rv reflect.Value, val interface{}) bool {
			return rv.Len() == val.(int)
		},
	}},
	`min`: {inputInt, _kinds{
		reflect.Slice: func(rv reflect.Value, val interface{}) bool {
			return rv.Len() >= val.(int)
		},
		reflect.Map: func(rv reflect.Value, val interface{}) bool {
			return rv.Len() >= val.(int)
		},
		reflect.String: func(rv reflect.Value, val interface{}) bool {
			return rv.Len() >= val.(int)
		},
	}},
	`max`: {inputInt, _kinds{
		reflect.Slice: func(rv reflect.Value, val interface{}) bool {
			return rv.Len() <= val.(int)
		},
		reflect.Map: func(rv reflect.Value, val interface{}) bool {
			return rv.Len() <= val.(int)
		},
		reflect.String: func(rv reflect.Value, val interface{}) bool {
			return rv.Len() <= val.(int)
		},
	}},
}