104 lines
2.1 KiB
JavaScript
104 lines
2.1 KiB
JavaScript
/*jshint -W054 */
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;(function (exports) {
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'use strict';
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window.YAML = window.YAML || {};
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window.YAML.parse = exports.jsyaml.load || require('jsyaml').load;
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window.YAML.stringify = exports.jsyaml.dump || require('jsyaml').dump;
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function readFrontMatter(text) {
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var lines
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, line
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, padIndent = ''
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, ymllines = []
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;
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lines = text.split(/\n/);
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line = lines.shift();
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if (!line.match(/^---\s*$/)) {
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return;
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}
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// our yaml parser can't handle objects
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// that start without indentation, so
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// we can add it if this is the case
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if (lines[0] && lines[0].match(/^\S/)) {
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padIndent = '';
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}
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while (true) {
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line = lines.shift();
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// premature end-of-file (unsupported yaml)
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if (!line && '' !== line) {
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ymllines = [];
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break;
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}
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// end-of-yaml front-matter
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if (line.match(/^---\s*$/)) {
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break;
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}
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if (line) {
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// supported yaml
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ymllines.push(padIndent + line);
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}
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}
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// XXX can't be sorted because arrays get messed up
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//ymllines.sort();
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if (ymllines) {
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return '---\n' + ymllines.join('\n');
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}
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return;
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}
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function separateText(text, fm) {
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var len
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, yml
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;
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yml = readFrontMatter(fm);
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// strip frontmatter from text, if any
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// including trailing '---' (which is accounted for by the added '\n')
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if (yml) {
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len = fm.split(/\n/).length + 1;
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} else {
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len = 0;
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}
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return text.split(/\n/).slice(len).join('\n');
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}
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function parseText(text) {
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var fm = readFrontMatter(text)
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, body = fm && separateText(text, fm)
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, yml
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;
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if (fm) {
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try {
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yml = window.YAML.parse(fm);
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} catch(e) {
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//
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}
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}
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return {
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yml: yml
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, frontmatter: fm
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, body: body
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};
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}
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exports.Frontmatter = exports.Frontmatter = {};
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exports.Frontmatter.Frontmatter = exports.Frontmatter;
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exports.Frontmatter.readText = readFrontMatter;
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exports.Frontmatter.separateText = separateText;
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exports.Frontmatter.parse = parseText;
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}('undefined' !== typeof exports && exports || window));
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