51 lines
1.1 KiB
JavaScript
51 lines
1.1 KiB
JavaScript
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var parser = require('js-yaml')
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var optionalByteOrderMark = '\\ufeff?'
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var pattern = '^(' +
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optionalByteOrderMark +
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'(= yaml =|---)' +
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'$([\\s\\S]*?)' +
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'^(?:\\2|\\.\\.\\.)' +
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'$' +
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(process.platform === 'win32' ? '\\r?' : '') +
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'(?:\\n)?)'
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// NOTE: If this pattern uses the 'g' flag the `regex` variable definition will
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// need to be moved down into the functions that use it.
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var regex = new RegExp(pattern, 'm')
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module.exports = extractor
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module.exports.test = test
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function extractor (string) {
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string = string || ''
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var lines = string.split(/(\r?\n)/)
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if (lines[0] && /= yaml =|---/.test(lines[0])) {
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return parse(string)
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} else {
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return { attributes: {}, body: string }
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}
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}
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function parse (string) {
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var match = regex.exec(string)
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if (!match) {
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return {
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attributes: {},
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body: string
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}
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}
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var yaml = match[match.length - 1].replace(/^\s+|\s+$/g, '')
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var attributes = parser.load(yaml) || {}
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var body = string.replace(match[0], '')
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return { attributes: attributes, body: body, frontmatter: yaml }
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}
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function test (string) {
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string = string || ''
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return regex.test(string)
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}
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