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package filter
import (
"fmt"
"reflect"
"regexp"
"strconv"
"strings"
)
// Match returns true if the given object matches the given filter.
func Match(obj any, set ClauseSet) (bool, error) {
if set.ParseInt == nil {
set.ParseInt = DefaultParseInt
}
if set.ParseUint == nil {
set.ParseUint = DefaultParseUint
}
if set.ParseString == nil {
set.ParseString = DefaultParseString
}
if set.ParseBool == nil {
set.ParseBool = DefaultParseBool
}
if set.ParseRegexp == nil {
set.ParseRegexp = DefaultParseRegexp
}
match := true
for _, clause := range set.Clauses {
value := ValueOf(obj, clause.Field)
clauseMatch, err := set.match(clause, value)
if err != nil {
return false, err
}
// Finish out logic
if clause.Not {
clauseMatch = !clauseMatch
}
switch clause.PrevLogical {
case set.Ops.And:
match = match && clauseMatch
case set.Ops.Or:
match = match || clauseMatch
default:
return false, fmt.Errorf("unexpected clause operator")
}
}
return match, nil
}
// DefaultParseInt converts the value of the clause to int64.
func DefaultParseInt(c Clause) (int64, error) {
return strconv.ParseInt(c.Value, 10, 0)
}
// DefaultParseUint converts the value of the clause to Uint64.
func DefaultParseUint(c Clause) (uint64, error) {
return strconv.ParseUint(c.Value, 10, 0)
}
// DefaultParseString converts the value of the clause to string.
func DefaultParseString(c Clause) (string, error) {
return c.Value, nil
}
// DefaultParseBool converts the value of the clause to boolean.
func DefaultParseBool(c Clause) (bool, error) {
return strconv.ParseBool(c.Value)
}
// DefaultParseRegexp converts the value of the clause to regexp.
func DefaultParseRegexp(c Clause) (*regexp.Regexp, error) {
regexpValue := c.Value
if !(strings.Contains(regexpValue, "^") || strings.Contains(regexpValue, "$")) {
regexpValue = "^" + regexpValue + "$"
}
return regexp.Compile("(?i)" + regexpValue)
}
func (s ClauseSet) match(c Clause, objValue any) (bool, error) {
var valueStr string
var valueRegexp *regexp.Regexp
var valueInt int64
var valueUint uint64
var valueBool bool
var err error
// If 'value' is type of string try to test value as a regexp.
valInfo := reflect.ValueOf(objValue)
kind := valInfo.Kind()
switch kind {
case reflect.String:
valueRegexp, _ = s.ParseRegexp(c)
if valueRegexp == nil {
valueStr, err = s.ParseString(c)
}
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
valueInt, err = s.ParseInt(c)
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
valueUint, err = s.ParseUint(c)
case reflect.Bool:
valueBool, err = s.ParseBool(c)
default:
return false, fmt.Errorf("Invalid type %q for field %q", kind.String(), c.Field)
}
if err != nil {
return false, fmt.Errorf("Failed to parse value: %w", err)
}
switch c.Operator {
case s.Ops.Equals:
if valueRegexp != nil {
return valueRegexp.MatchString(objValue.(string)), nil
}
switch val := objValue.(type) {
case string:
// Comparison is case insensitive.
return strings.EqualFold(val, valueStr), nil
case int, int8, int16, int32, int64:
return objValue == valueInt, nil
case uint, uint8, uint16, uint32, uint64:
return objValue == valueUint, nil
case bool:
return objValue == valueBool, nil
}
case s.Ops.NotEquals:
if valueRegexp != nil {
return !valueRegexp.MatchString(objValue.(string)), nil
}
switch val := objValue.(type) {
case string:
// Comparison is case insensitive.
return !strings.EqualFold(val, valueStr), nil
case int, int8, int16, int32, int64:
return objValue != valueInt, nil
case uint, uint8, uint16, uint32, uint64:
return objValue != valueUint, nil
case bool:
return objValue != valueBool, nil
}
case s.Ops.GreaterThan:
switch objValue.(type) {
case string, bool:
return false, fmt.Errorf("Invalid operator %q for field %q", c.Operator, c.Field)
case int, int8, int16, int32, int64:
return valInfo.Int() > valueInt, nil
case uint, uint8, uint16, uint32, uint64:
return valInfo.Uint() > valueUint, nil
}
case s.Ops.LessThan:
switch objValue.(type) {
case string, bool:
return false, fmt.Errorf("Invalid operator %q for field %q", c.Operator, c.Field)
case int, int8, int16, int32, int64:
return valInfo.Int() < valueInt, nil
case uint, uint8, uint16, uint32, uint64:
return valInfo.Uint() < valueUint, nil
}
case s.Ops.GreaterEqual:
switch objValue.(type) {
case string, bool:
return false, fmt.Errorf("Invalid operator %q for field %q", c.Operator, c.Field)
case int, int8, int16, int32, int64:
return valInfo.Int() >= valueInt, nil
case uint, uint8, uint16, uint32, uint64:
return valInfo.Uint() >= valueUint, nil
}
case s.Ops.LessEqual:
switch objValue.(type) {
case string, bool:
return false, fmt.Errorf("Invalid operator %q for field %q", c.Operator, c.Field)
case int, int8, int16, int32, int64:
return valInfo.Int() <= valueInt, nil
case uint, uint8, uint16, uint32, uint64:
return valInfo.Uint() <= valueUint, nil
}
default:
return false, fmt.Errorf("Unsupported operation")
}
return false, fmt.Errorf("Unsupported filter type %q for field %q", kind.String(), c.Field)
}
|
