/
filter.go
442 lines (390 loc) · 11.6 KB
/
filter.go
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package gopiper
import (
"errors"
"fmt"
"html"
"reflect"
"regexp"
"strconv"
"strings"
"time"
)
func init() {
RegisterFilter("preadd", preadd)
RegisterFilter("postadd", postadd)
RegisterFilter("replace", replace)
RegisterFilter("split", split)
RegisterFilter("join", join)
RegisterFilter("trim", trim)
RegisterFilter("trimspace", trimspace)
RegisterFilter("substr", substr)
RegisterFilter("intval", intval)
RegisterFilter("floatval", floatval)
RegisterFilter("hrefreplace", hrefreplace)
RegisterFilter("wraphtml", wraphtml)
RegisterFilter("tosbc", tosbc)
RegisterFilter("unescape", unescape)
RegisterFilter("escape", escape)
RegisterFilter("sprintf", sprintf)
RegisterFilter("sprintfmap", sprintfmap)
RegisterFilter("unixtime", unixtime)
RegisterFilter("unixmill", unixmill)
RegisterFilter("paging", paging)
RegisterFilter("quote", quote)
RegisterFilter("unquote", unquote)
}
type FilterFunction func(src *reflect.Value, params *reflect.Value) (interface{}, error)
var filters = make(map[string]FilterFunction)
func RegisterFilter(name string, fn FilterFunction) {
_, existing := filters[name]
if existing {
panic(fmt.Sprintf("Filter with name '%s' is already registered.", name))
}
filters[name] = fn
}
func ReplaceFilter(name string, fn FilterFunction) {
_, existing := filters[name]
if !existing {
panic(fmt.Sprintf("Filter with name '%s' does not exist (therefore cannot be overridden).", name))
}
filters[name] = fn
}
func applyFilter(name string, src *reflect.Value, params *reflect.Value) (interface{}, error) {
fn, existing := filters[name]
if !existing {
return nil, errors.New(fmt.Sprintf("Filter with name '%s' not found.", name))
}
return fn(src, params)
}
func callFilter(src interface{}, value string) (interface{}, error) {
if src == nil || len(value) == 0 {
return src, nil
}
exp, _ := regexp.Compile(`([a-zA-Z0-9\-_]+)(?:\(([\w\W]*?)\))?(\||$)`)
vt := exp.FindAllStringSubmatch(value, -1)
for _, v := range vt {
if len(v) < 3 {
continue
}
name := v[1]
params := v[2]
src_value := reflect.ValueOf(src)
param_value := reflect.ValueOf(params)
next, err := applyFilter(name, &src_value, ¶m_value)
if err != nil {
continue
}
src = next
}
return src, nil
}
func preadd(src *reflect.Value, params *reflect.Value) (interface{}, error) {
return params.String() + src.String(), nil
}
func postadd(src *reflect.Value, params *reflect.Value) (interface{}, error) {
return src.String() + params.String(), nil
}
func substr(src *reflect.Value, params *reflect.Value) (interface{}, error) {
vt := strings.Split(params.String(), ",")
if len(vt) == 1 {
start, _ := strconv.Atoi(vt[0])
return src.String()[start:], nil
} else if len(vt) == 2 {
start, _ := strconv.Atoi(vt[0])
end, _ := strconv.Atoi(vt[1])
return src.String()[start:end], nil
}
return src.Interface(), nil
}
func replace(src *reflect.Value, params *reflect.Value) (interface{}, error) {
vt := strings.Split(params.String(), ",")
if len(vt) == 1 {
return strings.Replace(src.String(), vt[0], "", -1), nil
} else if len(vt) == 2 {
return strings.Replace(src.String(), vt[0], vt[1], -1), nil
} else if len(vt) == 3 {
n, _ := strconv.Atoi(vt[2])
return strings.Replace(src.String(), vt[0], vt[1], n), nil
}
return src.Interface(), nil
}
func trim(src *reflect.Value, params *reflect.Value) (interface{}, error) {
if params == nil {
return src.Interface(), errors.New("filter trim nil params")
}
switch src.Interface().(type) {
case string:
return strings.Trim(src.String(), params.String()), nil
case []string:
vt, _ := src.Interface().([]string)
for i := 0; i < len(vt); i++ {
vt[i] = strings.Trim(vt[i], params.String())
}
return vt, nil
}
return src.Interface(), nil
}
func trimspace(src *reflect.Value, params *reflect.Value) (interface{}, error) {
switch src.Interface().(type) {
case string:
return strings.TrimSpace(src.String()), nil
case []string:
vt, _ := src.Interface().([]string)
for i := 0; i < len(vt); i++ {
vt[i] = strings.TrimSpace(vt[i])
}
return vt, nil
}
return src.Interface(), nil
}
func split(src *reflect.Value, params *reflect.Value) (interface{}, error) {
if params == nil {
return src.Interface(), errors.New("filter split nil params")
}
str := strings.TrimSpace(src.String())
if str == "" {
return []string{}, nil
}
return strings.Split(src.String(), params.String()), nil
}
func join(src *reflect.Value, params *reflect.Value) (interface{}, error) {
if params == nil {
return src.Interface(), errors.New("filter split nil params")
}
switch src.Interface().(type) {
case []string:
vt, _ := src.Interface().([]string)
rs := make([]string, 0)
for _, v := range vt {
if len(v) > 0 {
rs = append(rs, v)
}
}
return strings.Join(rs, params.String()), nil
}
return src.Interface(), nil
}
func intval(src *reflect.Value, params *reflect.Value) (interface{}, error) {
if src.Interface() == nil {
return 0, nil
}
v, _ := strconv.Atoi(src.String())
return v, nil
}
func floatval(src *reflect.Value, params *reflect.Value) (interface{}, error) {
if src.Interface() == nil {
return 0.0, nil
}
v, _ := strconv.ParseFloat(src.String(), 64)
return v, nil
}
func hrefreplace(src *reflect.Value, params *reflect.Value) (interface{}, error) {
href_filter_regexp, _ := regexp.Compile(`href(\s*)=(\s*)([\w\W]+?)"`)
return href_filter_regexp.ReplaceAllString(src.String(), params.String()), nil
}
func regexpreplace(src *reflect.Value, params *reflect.Value) (interface{}, error) {
return src.Interface(), nil
}
func tosbc(src *reflect.Value, params *reflect.Value) (interface{}, error) {
res := ""
for _, t := range src.String() {
if t == 12288 {
t = 32
} else if t > 65280 && t < 65375 {
t = t - 65248
}
res += string(t)
}
return res, nil
}
func unescape(src *reflect.Value, params *reflect.Value) (interface{}, error) {
return html.UnescapeString(src.String()), nil
}
func escape(src *reflect.Value, params *reflect.Value) (interface{}, error) {
return html.EscapeString(src.String()), nil
}
func wraphtml(src *reflect.Value, params *reflect.Value) (interface{}, error) {
if params == nil {
return src.Interface(), errors.New("filter wraphtml nil params")
}
switch src.Interface().(type) {
case string:
return fmt.Sprintf("<%s>%s</%s>", params.String(), src.String(), params.String()), nil
case []string:
vt, _ := src.Interface().([]string)
for i := 0; i < len(vt); i++ {
if len(vt[i]) <= 0 {
continue
}
vt[i] = fmt.Sprintf("<%s>%s</%s>", params.String(), vt[i], params.String())
}
return vt, nil
}
return src.Interface(), nil
}
func sprintf_multi_param(src *reflect.Value, params *reflect.Value) (interface{}, error) {
if params == nil {
return src.Interface(), errors.New("filter split nil params ")
}
if src.Type().Kind() == reflect.Array || src.Type().Kind() == reflect.Slice {
count := strings.Count(params.String(), "%")
ret := make([]interface{}, 0)
for i := 0; i < src.Len(); i++ {
ret = append(ret, src.Index(i).Interface())
}
if len(ret) > count {
return fmt.Sprintf(params.String(), ret[:count]...), nil
}
return fmt.Sprintf(params.String(), ret...), nil
}
return fmt.Sprintf(params.String(), src.Interface()), nil
}
func sprintf(src *reflect.Value, params *reflect.Value) (interface{}, error) {
if params == nil {
return src.Interface(), errors.New("filter split nil params")
}
switch src.Interface().(type) {
case string:
return fmt.Sprintf(params.String(), src.String()), nil
case []string:
vt, _ := src.Interface().([]string)
for i := 0; i < len(vt); i++ {
if len(vt[i]) <= 0 {
continue
}
vt[i] = fmt.Sprintf(params.String(), vt[i])
}
return vt, nil
}
return fmt.Sprintf(params.String(), src.Interface()), nil
}
func sprintfmap(src *reflect.Value, params *reflect.Value) (interface{}, error) {
if params == nil {
return src.Interface(), errors.New("filter split nil params")
}
msrc, ok := src.Interface().(map[string]interface{})
if ok == false {
return src.Interface(), errors.New("value is not map[string]interface{}")
}
vt := strings.Split(params.String(), ",")
if len(vt) <= 1 {
return src.Interface(), errors.New("params length must > 1")
}
p_array := []interface{}{}
for _, x := range vt[1:] {
if vm, ok := msrc[x]; ok {
p_array = append(p_array, vm)
}
}
return fmt.Sprintf(vt[0], p_array...), nil
}
func unixtime(src *reflect.Value, params *reflect.Value) (interface{}, error) {
return time.Now().Unix(), nil
}
func unixmill(src *reflect.Value, params *reflect.Value) (interface{}, error) {
return time.Now().UnixNano() / int64(time.Millisecond), nil
}
func paging(src *reflect.Value, params *reflect.Value) (interface{}, error) {
if params == nil {
return src.Interface(), errors.New("filter paging nil params")
}
src_type := src.Type().Kind()
if src_type != reflect.Slice && src_type != reflect.Array && src_type != reflect.String {
return src.Interface(), errors.New("value is not slice ,array or string")
}
vt := strings.Split(params.String(), ",")
if len(vt) < 2 {
return src.Interface(), errors.New("params length must > 1")
}
start, err := strconv.Atoi(vt[0])
end, err := strconv.Atoi(vt[1])
if err != nil {
return src.Interface(), errors.New("params type error:need int." + err.Error())
}
offset := -1
if len(vt) == 3 {
offset, err = strconv.Atoi(vt[2])
return src.Interface(), errors.New("params type error:need int." + err.Error())
if offset < 1 {
return src.Interface(), errors.New("offset must > 0")
}
}
var result []string
switch src.Interface().(type) {
case []interface{}:
{
vt, _ := src.Interface().([]interface{})
for i := start; i <= end; i++ {
for j := 0; j < len(vt); j++ {
if offset > 0 {
result = append(result, sprintf_replace(vt[j].(string), []string{strconv.Itoa(i * offset), strconv.Itoa((i + 1) * offset)}))
} else {
result = append(result, sprintf_replace(vt[j].(string), []string{strconv.Itoa(i)}))
}
}
}
return result, nil
}
case []string:
{
vt, _ := src.Interface().([]string)
for i := start; i <= end; i++ {
for j := 0; j < len(vt); j++ {
if offset > 0 {
result = append(result, sprintf_replace(vt[i], []string{strconv.Itoa(i * offset), strconv.Itoa((i + 1) * offset)}))
} else {
result = append(result, sprintf_replace(vt[i], []string{strconv.Itoa(i)}))
}
}
}
return result, nil
}
case string:
{
msrc1, ok := src.Interface().(string)
if ok == true {
for i := start; i <= end; i++ {
if offset > 0 {
result = append(result, sprintf_replace(msrc1, []string{strconv.Itoa(i * offset), strconv.Itoa((i + 1) * offset)}))
} else {
result = append(result, sprintf_replace(msrc1, []string{strconv.Itoa(i)}))
}
}
return result, nil
}
}
}
return src.Interface(), errors.New("do nothing,src type not support!")
}
func sprintf_replace(src string, param []string) string {
for i, _ := range param {
src = strings.Replace(src, "{"+strconv.Itoa(i)+"}", param[i], -1)
}
return src
}
func quote(src *reflect.Value, params *reflect.Value) (interface{}, error) {
switch src.Interface().(type) {
case string:
return strconv.Quote(src.String()), nil
case []string:
vt, _ := src.Interface().([]string)
for i := 0; i < len(vt); i++ {
vt[i] = strconv.Quote(vt[i])
}
return vt, nil
}
return src.Interface(), nil
}
func unquote(src *reflect.Value, params *reflect.Value) (interface{}, error) {
switch src.Interface().(type) {
case string:
return strconv.Unquote(`"` + src.String() + `"`)
case []string:
vt, _ := src.Interface().([]string)
for i := 0; i < len(vt); i++ {
vt[i], _ = strconv.Unquote(`"` + vt[i] + `"`)
}
return vt, nil
}
return src.Interface(), nil
}