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filters.go
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filters.go
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package runtime
import (
"bytes"
"fmt"
"io"
"math/big"
"reflect"
"strings"
"time"
"unicode/utf8"
)
type BuiltinFilter struct{}
func NewBuiltinFilter() *BuiltinFilter {
return &BuiltinFilter{}
}
/**
* Prints an arbitrary variable's detailed information to help template authors
* to debug. This is supposed to be used for dev mode only and thus it might have
* a compromised performance.
*/
func (bf *BuiltinFilter) Debug(a interface{}) string {
var buffer bytes.Buffer
bf.inspect("data", a, &buffer)
return buffer.String()
}
func (bf *BuiltinFilter) Length(a []interface{}) int {
return len(a)
}
func (bf *BuiltinFilter) inspect(name string, a interface{}, writer io.Writer) {
a = indirect(a)
t := reflect.TypeOf(a)
v := reflect.ValueOf(a)
io.WriteString(writer, "<div style=\"padding-left:20px\">")
// TODO: Improve it so that all level of composite types can be detailed.
switch t.Kind() {
case reflect.Struct:
io.WriteString(writer, fmt.Sprintf("%s (%s): ", name, t.String()))
io.WriteString(writer, "{<br>")
for i := 0; i < v.NumField(); i++ {
fieldVal := v.Field(i)
fieldType := t.Field(i)
bf.inspect(fieldType.Name, fieldVal.Interface(), writer)
}
io.WriteString(writer, "}<br>")
default:
io.WriteString(writer, fmt.Sprintf("%s (%s): %+v<br>", name, t.String(), a))
}
io.WriteString(writer, "</div>")
}
func (bf *BuiltinFilter) Title(a interface{}) string {
a = indirect(a)
return strings.Title(fmt.Sprint(reflect.ValueOf(a)))
}
func (bf *BuiltinFilter) Capfirst(a interface{}) string {
a = indirect(a)
t := reflect.TypeOf(a)
v := reflect.ValueOf(a)
switch t.Kind() {
case reflect.String:
s := v.String()
if len(s) > 0 {
f, size := utf8.DecodeRuneInString(s)
s = fmt.Sprint(strings.ToUpper(string(f)), s[size:])
}
return s
}
// TODO: do we need a util to print out the real value instead of type?
return fmt.Sprint(v)
}
func (bf *BuiltinFilter) Center(a interface{}, width int) string {
a = indirect(a)
t := reflect.TypeOf(a)
v := reflect.ValueOf(a)
switch t.Kind() {
case reflect.String:
s := v.String()
if len(s) < width {
extra := width - len(s)
left := extra / 2
right := extra - left
var buffer bytes.Buffer
buffer.WriteString(generateString(left, " "))
buffer.WriteString(s)
buffer.WriteString(generateString(right, " "))
s = buffer.String()
}
return s
}
// TODO: do we need a util to print out the real value instead of type?
return fmt.Sprint(v)
}
func (bf *BuiltinFilter) Ljust(a interface{}, width int) string {
return just(a, width, true)
}
func (bf *BuiltinFilter) Rjust(a interface{}, width int) string {
return just(a, width, false)
}
func (bf *BuiltinFilter) Cut(a interface{}, removed string) string {
a = indirect(a)
s := a.(string)
return strings.Replace(s, removed, "", -1)
}
func (bf *BuiltinFilter) Join(a interface{}, separator string) string {
a = indirect(a)
switch t := a.(type) {
case string:
return t
case []string:
return strings.Join(t, separator)
}
return fmt.Sprint(a)
}
func (bf *BuiltinFilter) FloatFormat(a interface{}, precision int) string {
a = indirect(a)
switch a := a.(type) {
case float32:
return bf.floatFormat(float64(a), precision)
case float64:
return bf.floatFormat(a, precision)
default:
return ""
}
}
func (bf *BuiltinFilter) floatFormat(a float64, precision int) string {
r := new(big.Rat)
r.SetFloat64(a)
if float64(int(a)) == a {
if precision < 2 {
precision = 0
}
return r.FloatString(precision)
}
if precision < 0 {
precision = -precision
}
return r.FloatString(precision)
}
func (bf *BuiltinFilter) Quote(a interface{}) string {
// TODO: Allow specify quote types (", ')
return fmt.Sprintf("\"%s\"", indirect(a))
}
func (bf *BuiltinFilter) Format(fmtStr string, a ...interface{}) string {
return fmt.Sprintf(fmtStr, a...)
}
func just(a interface{}, width int, left bool) string {
a = indirect(a)
s := a.(string)
if len(s) < width {
extra := width - len(s)
var buffer bytes.Buffer
if left {
buffer.WriteString(s)
buffer.WriteString(generateString(extra, " "))
} else {
buffer.WriteString(generateString(extra, " "))
buffer.WriteString(s)
}
s = buffer.String()
}
return s
}
func generateString(length int, char string) string {
var buffer bytes.Buffer
for i := 0; i < length; i++ {
buffer.WriteString(char)
}
return buffer.String()
}
// Example:
// <div go:content="unixdate('01/02/2006 15:04:05'), 1390637053836182000"></div>
func (bf *BuiltinFilter) UnixDate(format string, a interface{}) string {
return time.Unix(convertTime(a), 0).Format(format)
}
// Example:
// <div go:content="unixnanodate('01/02/2006 15:04:05'), 1390637053836182000"></div>
func (bf *BuiltinFilter) UnixNanoDate(format string, a interface{}) string {
return time.Unix(0, convertTime(a)).Format(format)
}
func convertTime(a interface{}) int64 {
a = indirect(a)
switch a := a.(type) {
case int64:
return a
case uint64:
return int64(a)
}
return 0
}