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dsl.go
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dsl.go
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package dsl
import (
"encoding/json"
"errors"
"fmt"
"reflect"
"strconv"
"strings"
)
type DSL struct {
Namespace string `json:"namespace"`
Offset int `json:"offset"`
Limit int `json:"limit"`
Distinct string `json:"distinct"`
Sort Sort `json:"sort"`
Filters []Filter `json:"filters"`
Explain bool `json:"explain,omitempty"`
}
type sort Sort
type Sort struct {
Field string `json:"field"`
Desc bool `json:"desc"`
Values []interface{} `json:"values,omitempty"`
}
type Filter struct {
Op string
Field string
Cond string
Value interface{}
}
type filter struct {
Op string `json:"op"`
Field string `json:"field"`
Cond string `json:"cond"`
Value value `json:"value"`
}
type value struct {
data string
}
func (s *Sort) UnmarshalJSON(data []byte) error {
sort := sort{}
err := json.Unmarshal(data, &sort)
if err != nil {
return err
}
s.Field = sort.Field
s.Desc = sort.Desc
s.Values = sort.Values
return s.CheckValuesType()
}
func (s *Sort) CheckValuesType() error {
if len(s.Values) == 0 {
return nil
}
t := reflect.TypeOf(s.Values[0])
for _, value := range s.Values {
if t != reflect.TypeOf(value) {
return errors.New("array must be homogeneous")
}
}
return nil
}
func (v *value) UnmarshalJSON(data []byte) error {
v.data = string(data)
return nil
}
func (f *Filter) UnmarshalJSON(data []byte) error {
flt := filter{}
err := json.Unmarshal(data, &flt)
if err != nil {
return err
}
f.Op = flt.Op
f.Cond = flt.Cond
f.Field = flt.Field
return f.ParseValue(flt.Value.data)
}
func (f *Filter) ParseValue(data string) error {
if strings.HasPrefix(data, `"$`) {
f.Value = strings.Trim(data, `"`)
return nil
}
switch f.Cond {
case "EQ", "GT", "LT", "GE", "LE":
if len(data) == 0 || data == `""` || data == "null" {
f.Value = nil
break
}
if data == "true" {
f.Value = true
}
if data == "false" {
f.Value = false
}
if strings.HasPrefix(data, `[`) && strings.HasSuffix(data, `]`) {
return errors.New("filter value must not be array")
}
if strings.HasPrefix(data, `{`) && strings.HasSuffix(data, `}`) {
return errors.New("filter value must not be object")
}
if strings.HasPrefix(data, `"`) && strings.HasSuffix(data, `"`) {
f.Value = strings.Trim(data, `"`)
break
}
if strings.Contains(data, ".") {
if v, err := strconv.ParseFloat(data, 64); err != nil {
return err
} else {
f.Value = v
}
break
}
if v, err := strconv.ParseInt(data, 10, 64); err != nil {
return err
} else {
f.Value = v
}
case "SET", "RANGE", "ALLSET":
if len(data) == 0 || data == `[]` || data == "null" {
f.Value = nil
break
}
var rawValues []interface{}
err := json.Unmarshal([]byte(data), &rawValues)
if err != nil {
return err
}
if f.Cond == "RANGE" && len(rawValues) != 2 {
return errors.New("range argument array must has 2 elements")
}
if len(rawValues) == 0 {
f.Value = nil
break
}
switch rawValues[0].(type) {
case int:
values := make([]int, len(rawValues), len(rawValues))
for i, v := range rawValues {
if value, ok := v.(int); !ok {
return errors.New("array must be homogeneous")
} else {
values[i] = value
}
}
f.Value = values
case float64:
values := make([]int, len(rawValues), len(rawValues))
for i, v := range rawValues {
if value, ok := v.(float64); !ok {
return errors.New("array must be homogeneous")
} else {
values[i] = int(value)
}
}
f.Value = values
case string:
values := make([]string, len(rawValues), len(rawValues))
for i, v := range rawValues {
if value, ok := v.(string); !ok {
return errors.New("array must be homogeneous")
} else {
values[i] = value
}
}
f.Value = values
}
case "ANY", "EMPTY":
f.Value = 0
default:
return fmt.Errorf("cond type %s not found", f.Cond)
}
return nil
}