prism-previewer-angle.js
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(function() {
if (
typeof self !== 'undefined' && !self.Prism ||
typeof global !== 'undefined' && !global.Prism
) {
return;
}
var languages = {
'css': true,
'less': true,
'markup': {
lang: 'markup',
before: 'punctuation',
inside: 'inside',
root: Prism.languages.markup && Prism.languages.markup['tag'].inside['attr-value']
},
'sass': [
{
lang: 'sass',
inside: 'inside',
root: Prism.languages.sass && Prism.languages.sass['property-line']
},
{
lang: 'sass',
before: 'operator',
inside: 'inside',
root: Prism.languages.sass && Prism.languages.sass['variable-line']
}
],
'scss': true,
'stylus': [
{
lang: 'stylus',
before: 'func',
inside: 'rest',
root: Prism.languages.stylus && Prism.languages.stylus['property-declaration'].inside
},
{
lang: 'stylus',
before: 'func',
inside: 'rest',
root: Prism.languages.stylus && Prism.languages.stylus['variable-declaration'].inside
}
]
};
Prism.hooks.add('before-highlight', function (env) {
if (env.language && languages[env.language] && !languages[env.language].initialized) {
var lang = languages[env.language];
if (Prism.util.type(lang) !== 'Array') {
lang = [lang];
}
lang.forEach(function(lang) {
var before, inside, root, skip;
if (lang === true) {
before = 'important';
inside = env.language;
lang = env.language;
} else {
before = lang.before || 'important';
inside = lang.inside || lang.lang;
root = lang.root || Prism.languages;
skip = lang.skip;
lang = env.language;
}
if (!skip && Prism.languages[lang]) {
Prism.languages.insertBefore(inside, before, {
'angle': /(?:\b|\B-|(?=\B\.))\d*\.?\d+(?:deg|g?rad|turn)\b/i
}, root);
env.grammar = Prism.languages[lang];
languages[env.language] = {initialized: true};
}
});
}
});
if (Prism.plugins.Previewer) {
new Prism.plugins.Previewer('angle', function(value) {
var num = parseFloat(value);
var unit = value.match(/[a-z]+$/i);
var max, percentage;
if (!num || !unit) {
return false;
}
unit = unit[0];
switch(unit) {
case 'deg':
max = 360;
break;
case 'grad':
max = 400;
break;
case 'rad':
max = 2 * Math.PI;
break;
case 'turn':
max = 1;
}
percentage = 100 * num/max;
percentage %= 100;
this[(num < 0? 'set' : 'remove') + 'Attribute']('data-negative', '');
this.querySelector('circle').style.strokeDasharray = Math.abs(percentage) + ',500';
return true;
}, '*', function () {
this._elt.innerHTML = '<svg viewBox="0 0 64 64">' +
'<circle r="16" cy="32" cx="32"></circle>' +
'</svg>';
});
}
}());