66 lines
1.5 KiB
JavaScript
66 lines
1.5 KiB
JavaScript
'use strict'
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var uri = require('../util/enclose-uri')
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var title = require('../util/enclose-title')
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module.exports = link
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var space = ' '
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var leftSquareBracket = '['
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var rightSquareBracket = ']'
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var leftParenthesis = '('
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var rightParenthesis = ')'
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// Expression for a protocol:
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// See <https://en.wikipedia.org/wiki/Uniform_Resource_Identifier#Generic_syntax>.
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var protocol = /^[a-z][a-z+.-]+:\/?/i
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// Stringify a link.
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//
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// When no title exists, the compiled `children` equal `url`, and `url` starts
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// with a protocol, an auto link is created:
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//
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// ```markdown
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// <http://example.com>
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// ```
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//
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// Otherwise, is smart about enclosing `url` (see `encloseURI()`) and `title`
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// (see `encloseTitle()`).
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// ```
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//
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// ```markdown
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// [foo](<foo at bar dot com> 'An "example" e-mail')
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// ```
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//
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// Supports named entities in the `url` and `title` when in `settings.encode`
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// mode.
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function link(node) {
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var self = this
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var content = self.encode(node.url || '', node)
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var exit = self.enterLink()
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var escaped = self.encode(self.escape(node.url || '', node))
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var value = self.all(node).join('')
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exit()
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if (node.title == null && protocol.test(content) && escaped === value) {
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// Backslash escapes do not work in autolinks, so we do not escape.
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return uri(self.encode(node.url), true)
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}
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content = uri(content)
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if (node.title) {
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content += space + title(self.encode(self.escape(node.title, node), node))
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}
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return (
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leftSquareBracket +
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value +
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rightSquareBracket +
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leftParenthesis +
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content +
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rightParenthesis
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)
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}
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