author | Mikael Berthe <mikael@lilotux.net> |
Sun, 28 May 2017 10:36:07 +0200 | |
changeset 157 | 908a433f02c0 |
parent 132 | 4bf4f6ce268e |
permissions | -rw-r--r-- |
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// Copyright (c) 2015 Shawn Goertzen |
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// Copyright (c) 2017 Mikael Berthe |
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// |
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// This code mostly comes from github.com/sgoertzen/html2text, |
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// with some specific but intrusive changes for Mastodon HTML messages. |
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// For example, links are not displayed for hashtags and mentions, |
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// and links alone are displayed for the other cases. |
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// |
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// Licensed under the MIT license. |
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// Please see the LICENSE file is this directory. |
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|
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package html2text |
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|
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import ( |
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"bytes" |
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"errors" |
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"golang.org/x/net/html" |
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"strings" |
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) |
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|
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var breakers = map[string]bool{ |
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"br": true, |
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"div": true, |
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"tr": true, |
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"li": true, |
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"p": true, |
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} |
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// Textify turns an HTML body into a text string |
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func Textify(body string) (string, error) { |
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r := strings.NewReader(body) |
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doc, err := html.Parse(r) |
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if err != nil { |
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return "", errors.New("unable to parse the html") |
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} |
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var buffer bytes.Buffer |
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process(doc, &buffer, "") |
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s := strings.TrimSpace(buffer.String()) |
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return s, nil |
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} |
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func process(n *html.Node, b *bytes.Buffer, class string) { |
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processChildren := true |
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|
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if n.Type == html.ElementNode && n.Data == "head" { |
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return |
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} else if n.Type == html.ElementNode && n.Data == "a" && n.FirstChild != nil { |
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anchor(n, b, class) |
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processChildren = false |
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} else if n.Type == html.TextNode { |
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// Clean up data |
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cleanData := strings.Replace(strings.Trim(n.Data, " \t"), "\u00a0", " ", -1) |
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|
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// Heuristics to add a whitespace character... |
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var prevSpace, nextSpace bool // hint if previous/next char is a space |
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var last byte |
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bl := b.Len() |
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if bl > 0 { |
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last = b.Bytes()[bl-1] |
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if last == ' ' { |
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prevSpace = true |
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} |
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} |
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if len(cleanData) > 0 && cleanData[0] == ' ' { |
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nextSpace = true |
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} |
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if prevSpace && nextSpace { |
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b.WriteString(cleanData[1:]) // Trim 1 space |
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} else { |
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if bl > 0 && last != '\n' && last != '@' && last != '#' && !prevSpace && !nextSpace { |
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b.WriteString(" ") |
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} |
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b.WriteString(cleanData) |
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} |
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} |
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|
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if processChildren { |
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var class string |
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if n.Type == html.ElementNode && n.Data == "span" { |
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for _, attr := range n.Attr { |
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if attr.Key == "class" { |
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class = attr.Val |
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break |
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} |
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} |
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} |
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for c := n.FirstChild; c != nil; c = c.NextSibling { |
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process(c, b, class) |
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} |
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} |
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|
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if b.Len() > 0 { |
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bl := b.Len() |
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last := b.Bytes()[bl-1] |
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if last != '\n' && n.Type == html.ElementNode && breakers[n.Data] { |
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// Remove previous space |
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for last == ' ' { |
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bl-- |
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b.Truncate(bl) |
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if bl > 0 { |
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last = b.Bytes()[bl-1] |
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} else { |
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last = '\x00' |
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} |
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} |
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b.WriteString("\n") |
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} |
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} |
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} |
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|
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func anchor(n *html.Node, b *bytes.Buffer, class string) { |
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bl := b.Len() |
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var last byte |
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if bl > 0 { |
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last = b.Bytes()[bl-1] |
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} |
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|
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119 |
// Add heading space if needed |
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if last != ' ' && last != '\n' && last != '#' && last != '@' { |
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121 |
b.WriteString(" ") |
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parents:
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122 |
} |
4bf4f6ce268e
html2text: Try and handle one more mention case
Mikael Berthe <mikael@lilotux.net>
parents:
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123 |
|
126
7d712d2bde73
Much improved html2text (fromhtml)
Mikael Berthe <mikael@lilotux.net>
parents:
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124 |
var tmpbuf bytes.Buffer |
7d712d2bde73
Much improved html2text (fromhtml)
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parents:
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125 |
for c := n.FirstChild; c != nil; c = c.NextSibling { |
7d712d2bde73
Much improved html2text (fromhtml)
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parents:
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126 |
process(c, &tmpbuf, class) |
7d712d2bde73
Much improved html2text (fromhtml)
Mikael Berthe <mikael@lilotux.net>
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127 |
} |
7d712d2bde73
Much improved html2text (fromhtml)
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parents:
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128 |
|
7d712d2bde73
Much improved html2text (fromhtml)
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parents:
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129 |
if class == "tag" || class == "h-card" || last == '@' { |
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parents:
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130 |
b.Write(tmpbuf.Bytes()) |
7d712d2bde73
Much improved html2text (fromhtml)
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parents:
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131 |
return |
7d712d2bde73
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132 |
} |
7d712d2bde73
Much improved html2text (fromhtml)
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133 |
|
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Much improved html2text (fromhtml)
Mikael Berthe <mikael@lilotux.net>
parents:
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134 |
s := tmpbuf.String() |
7d712d2bde73
Much improved html2text (fromhtml)
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parents:
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135 |
if strings.HasPrefix(s, "#") || strings.HasPrefix(s, "@") { |
7d712d2bde73
Much improved html2text (fromhtml)
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parents:
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136 |
b.WriteString(s) // Tag or mention: display content |
7d712d2bde73
Much improved html2text (fromhtml)
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parents:
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137 |
return |
7d712d2bde73
Much improved html2text (fromhtml)
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parents:
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138 |
} |
7d712d2bde73
Much improved html2text (fromhtml)
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parents:
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139 |
|
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Much improved html2text (fromhtml)
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140 |
// Display href link |
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parents:
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141 |
for _, attr := range n.Attr { |
7d712d2bde73
Much improved html2text (fromhtml)
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142 |
if attr.Key == "href" { |
7d712d2bde73
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143 |
link := n.Attr[0].Val |
7d712d2bde73
Much improved html2text (fromhtml)
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parents:
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144 |
b.WriteString(link) |
7d712d2bde73
Much improved html2text (fromhtml)
Mikael Berthe <mikael@lilotux.net>
parents:
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145 |
break |
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Much improved html2text (fromhtml)
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parents:
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146 |
} |
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Much improved html2text (fromhtml)
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parents:
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147 |
} |
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Much improved html2text (fromhtml)
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148 |
} |