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102 lines
2.7 KiB
Go
102 lines
2.7 KiB
Go
// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package template
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import (
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"fmt"
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htmltemplate "html/template"
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"reflect"
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)
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type contentType uint8
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const (
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contentTypePlain contentType = iota
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contentTypeCSS
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contentTypeHTML
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contentTypeHTMLAttr
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contentTypeJS
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contentTypeJSStr
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contentTypeURL
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contentTypeSrcset
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// contentTypeUnsafe is used in attr.go for values that affect how
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// embedded content and network messages are formed, vetted,
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// or interpreted; or which credentials network messages carry.
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contentTypeUnsafe
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)
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// indirect returns the value, after dereferencing as many times
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// as necessary to reach the base type (or nil).
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func indirect(a interface{}) interface{} {
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if a == nil {
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return nil
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}
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if t := reflect.TypeOf(a); t.Kind() != reflect.Ptr {
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// Avoid creating a reflect.Value if it's not a pointer.
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return a
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}
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v := reflect.ValueOf(a)
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for v.Kind() == reflect.Ptr && !v.IsNil() {
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v = v.Elem()
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}
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return v.Interface()
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}
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var (
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errorType = reflect.TypeOf((*error)(nil)).Elem()
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fmtStringerType = reflect.TypeOf((*fmt.Stringer)(nil)).Elem()
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)
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// indirectToStringerOrError returns the value, after dereferencing as many times
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// as necessary to reach the base type (or nil) or an implementation of fmt.Stringer
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// or error,
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func indirectToStringerOrError(a interface{}) interface{} {
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if a == nil {
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return nil
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}
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v := reflect.ValueOf(a)
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for !v.Type().Implements(fmtStringerType) && !v.Type().Implements(errorType) && v.Kind() == reflect.Ptr && !v.IsNil() {
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v = v.Elem()
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}
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return v.Interface()
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}
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// stringify converts its arguments to a string and the type of the content.
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// All pointers are dereferenced, as in the text/template package.
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func stringify(args ...interface{}) (string, contentType) {
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if len(args) == 1 {
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switch s := indirect(args[0]).(type) {
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case string:
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return s, contentTypePlain
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case htmltemplate.CSS:
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return string(s), contentTypeCSS
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case htmltemplate.HTML:
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return string(s), contentTypeHTML
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case htmltemplate.HTMLAttr:
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return string(s), contentTypeHTMLAttr
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case htmltemplate.JS:
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return string(s), contentTypeJS
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case htmltemplate.JSStr:
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return string(s), contentTypeJSStr
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case htmltemplate.URL:
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return string(s), contentTypeURL
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case htmltemplate.Srcset:
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return string(s), contentTypeSrcset
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}
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}
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i := 0
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for _, arg := range args {
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// We skip untyped nil arguments for backward compatibility.
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// Without this they would be output as <nil>, escaped.
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// See issue 25875.
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if arg == nil {
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continue
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}
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args[i] = indirectToStringerOrError(arg)
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i++
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}
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return fmt.Sprint(args[:i]...), contentTypePlain
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}
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