| // Copyright 2009 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| // Template library: default formatters |
| |
| package template |
| |
| import ( |
| "bytes"; |
| "fmt"; |
| "io"; |
| "strings"; |
| ) |
| |
| // StringFormatter formats into the default string representation. |
| // It is stored under the name "str" and is the default formatter. |
| // You can override the default formatter by storing your default |
| // under the name "" in your custom formatter map. |
| func StringFormatter(w io.Writer, value interface{}, format string) { |
| fmt.Fprint(w, value) |
| } |
| |
| var ( |
| esc_quot = strings.Bytes("""); // shorter than """ |
| esc_apos = strings.Bytes("'"); // shorter than "'" |
| esc_amp = strings.Bytes("&"); |
| esc_lt = strings.Bytes("<"); |
| esc_gt = strings.Bytes(">"); |
| ) |
| |
| // HTMLEscape writes to w the properly escaped HTML equivalent |
| // of the plain text data s. |
| func HTMLEscape(w io.Writer, s []byte) { |
| var esc []byte; |
| last := 0; |
| for i, c := range s { |
| switch c { |
| case '"': |
| esc = esc_quot |
| case '\'': |
| esc = esc_apos |
| case '&': |
| esc = esc_amp |
| case '<': |
| esc = esc_lt |
| case '>': |
| esc = esc_gt |
| default: |
| continue |
| } |
| w.Write(s[last:i]); |
| w.Write(esc); |
| last = i + 1; |
| } |
| w.Write(s[last:len(s)]); |
| } |
| |
| // HTMLFormatter formats arbitrary values for HTML |
| func HTMLFormatter(w io.Writer, value interface{}, format string) { |
| var b bytes.Buffer; |
| fmt.Fprint(&b, value); |
| HTMLEscape(w, b.Bytes()); |
| } |