github.com/geraldss/go/src@v0.0.0-20210511222824-ac7d0ebfc235/mime/example_test.go (about)

     1  // Copyright 2015 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package mime_test
     6  
     7  import (
     8  	"bytes"
     9  	"fmt"
    10  	"io"
    11  	"mime"
    12  )
    13  
    14  func ExampleWordEncoder_Encode() {
    15  	fmt.Println(mime.QEncoding.Encode("utf-8", "¡Hola, señor!"))
    16  	fmt.Println(mime.QEncoding.Encode("utf-8", "Hello!"))
    17  	fmt.Println(mime.BEncoding.Encode("UTF-8", "¡Hola, señor!"))
    18  	fmt.Println(mime.QEncoding.Encode("ISO-8859-1", "Caf\xE9"))
    19  	// Output:
    20  	// =?utf-8?q?=C2=A1Hola,_se=C3=B1or!?=
    21  	// Hello!
    22  	// =?UTF-8?b?wqFIb2xhLCBzZcOxb3Ih?=
    23  	// =?ISO-8859-1?q?Caf=E9?=
    24  }
    25  
    26  func ExampleWordDecoder_Decode() {
    27  	dec := new(mime.WordDecoder)
    28  	header, err := dec.Decode("=?utf-8?q?=C2=A1Hola,_se=C3=B1or!?=")
    29  	if err != nil {
    30  		panic(err)
    31  	}
    32  	fmt.Println(header)
    33  
    34  	dec.CharsetReader = func(charset string, input io.Reader) (io.Reader, error) {
    35  		switch charset {
    36  		case "x-case":
    37  			// Fake character set for example.
    38  			// Real use would integrate with packages such
    39  			// as code.google.com/p/go-charset
    40  			content, err := io.ReadAll(input)
    41  			if err != nil {
    42  				return nil, err
    43  			}
    44  			return bytes.NewReader(bytes.ToUpper(content)), nil
    45  		default:
    46  			return nil, fmt.Errorf("unhandled charset %q", charset)
    47  		}
    48  	}
    49  	header, err = dec.Decode("=?x-case?q?hello!?=")
    50  	if err != nil {
    51  		panic(err)
    52  	}
    53  	fmt.Println(header)
    54  	// Output:
    55  	// ¡Hola, señor!
    56  	// HELLO!
    57  }
    58  
    59  func ExampleWordDecoder_DecodeHeader() {
    60  	dec := new(mime.WordDecoder)
    61  	header, err := dec.DecodeHeader("=?utf-8?q?=C3=89ric?= <eric@example.org>, =?utf-8?q?Ana=C3=AFs?= <anais@example.org>")
    62  	if err != nil {
    63  		panic(err)
    64  	}
    65  	fmt.Println(header)
    66  
    67  	header, err = dec.DecodeHeader("=?utf-8?q?=C2=A1Hola,?= =?utf-8?q?_se=C3=B1or!?=")
    68  	if err != nil {
    69  		panic(err)
    70  	}
    71  	fmt.Println(header)
    72  
    73  	dec.CharsetReader = func(charset string, input io.Reader) (io.Reader, error) {
    74  		switch charset {
    75  		case "x-case":
    76  			// Fake character set for example.
    77  			// Real use would integrate with packages such
    78  			// as code.google.com/p/go-charset
    79  			content, err := io.ReadAll(input)
    80  			if err != nil {
    81  				return nil, err
    82  			}
    83  			return bytes.NewReader(bytes.ToUpper(content)), nil
    84  		default:
    85  			return nil, fmt.Errorf("unhandled charset %q", charset)
    86  		}
    87  	}
    88  	header, err = dec.DecodeHeader("=?x-case?q?hello_?= =?x-case?q?world!?=")
    89  	if err != nil {
    90  		panic(err)
    91  	}
    92  	fmt.Println(header)
    93  	// Output:
    94  	// Éric <eric@example.org>, Anaïs <anais@example.org>
    95  	// ¡Hola, señor!
    96  	// HELLO WORLD!
    97  }
    98  
    99  func ExampleFormatMediaType() {
   100  	mediatype := "text/html"
   101  	params := map[string]string{
   102  		"charset": "utf-8",
   103  	}
   104  
   105  	result := mime.FormatMediaType(mediatype, params)
   106  
   107  	fmt.Println("result:", result)
   108  	// Output:
   109  	// result: text/html; charset=utf-8
   110  }
   111  
   112  func ExampleParseMediaType() {
   113  	mediatype, params, err := mime.ParseMediaType("text/html; charset=utf-8")
   114  	if err != nil {
   115  		panic(err)
   116  	}
   117  
   118  	fmt.Println("type:", mediatype)
   119  	fmt.Println("charset:", params["charset"])
   120  	// Output:
   121  	// type: text/html
   122  	// charset: utf-8
   123  }