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prism-normalize-whitespace.js
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Sat, Mar 15, 05:38

prism-normalize-whitespace.js
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(function () {
if (typeof Prism === 'undefined') {
return;
}
var assign = Object.assign || function (obj1, obj2) {
for (var name in obj2) {
if (obj2.hasOwnProperty(name)) {
obj1[name] = obj2[name];
}
}
return obj1;
};
function NormalizeWhitespace(defaults) {
this.defaults = assign({}, defaults);
}
function toCamelCase(value) {
return value.replace(/-(\w)/g, function (match, firstChar) {
return firstChar.toUpperCase();
});
}
function tabLen(str) {
var res = 0;
for (var i = 0; i < str.length; ++i) {
if (str.charCodeAt(i) == '\t'.charCodeAt(0)) {
res += 3;
}
}
return str.length + res;
}
var settingsConfig = {
'remove-trailing': 'boolean',
'remove-indent': 'boolean',
'left-trim': 'boolean',
'right-trim': 'boolean',
'break-lines': 'number',
'indent': 'number',
'remove-initial-line-feed': 'boolean',
'tabs-to-spaces': 'number',
'spaces-to-tabs': 'number',
};
NormalizeWhitespace.prototype = {
setDefaults: function (defaults) {
this.defaults = assign(this.defaults, defaults);
},
normalize: function (input, settings) {
settings = assign(this.defaults, settings);
for (var name in settings) {
var methodName = toCamelCase(name);
if (name !== 'normalize' && methodName !== 'setDefaults' &&
settings[name] && this[methodName]) {
input = this[methodName].call(this, input, settings[name]);
}
}
return input;
},
/*
* Normalization methods
*/
leftTrim: function (input) {
return input.replace(/^\s+/, '');
},
rightTrim: function (input) {
return input.replace(/\s+$/, '');
},
tabsToSpaces: function (input, spaces) {
spaces = spaces|0 || 4;
return input.replace(/\t/g, new Array(++spaces).join(' '));
},
spacesToTabs: function (input, spaces) {
spaces = spaces|0 || 4;
return input.replace(RegExp(' {' + spaces + '}', 'g'), '\t');
},
removeTrailing: function (input) {
return input.replace(/\s*?$/gm, '');
},
// Support for deprecated plugin remove-initial-line-feed
removeInitialLineFeed: function (input) {
return input.replace(/^(?:\r?\n|\r)/, '');
},
removeIndent: function (input) {
var indents = input.match(/^[^\S\n\r]*(?=\S)/gm);
if (!indents || !indents[0].length) {
return input;
}
indents.sort(function (a, b) { return a.length - b.length; });
if (!indents[0].length) {
return input;
}
return input.replace(RegExp('^' + indents[0], 'gm'), '');
},
indent: function (input, tabs) {
return input.replace(/^[^\S\n\r]*(?=\S)/gm, new Array(++tabs).join('\t') + '$&');
},
breakLines: function (input, characters) {
characters = (characters === true) ? 80 : characters|0 || 80;
var lines = input.split('\n');
for (var i = 0; i < lines.length; ++i) {
if (tabLen(lines[i]) <= characters) {
continue;
}
var line = lines[i].split(/(\s+)/g);
var len = 0;
for (var j = 0; j < line.length; ++j) {
var tl = tabLen(line[j]);
len += tl;
if (len > characters) {
line[j] = '\n' + line[j];
len = tl;
}
}
lines[i] = line.join('');
}
return lines.join('\n');
}
};
// Support node modules
if (typeof module !== 'undefined' && module.exports) {
module.exports = NormalizeWhitespace;
}
Prism.plugins.NormalizeWhitespace = new NormalizeWhitespace({
'remove-trailing': true,
'remove-indent': true,
'left-trim': true,
'right-trim': true,
/*'break-lines': 80,
'indent': 2,
'remove-initial-line-feed': false,
'tabs-to-spaces': 4,
'spaces-to-tabs': 4*/
});
Prism.hooks.add('before-sanity-check', function (env) {
var Normalizer = Prism.plugins.NormalizeWhitespace;
// Check settings
if (env.settings && env.settings['whitespace-normalization'] === false) {
return;
}
// Check classes
if (!Prism.util.isActive(env.element, 'whitespace-normalization', true)) {
return;
}
// Simple mode if there is no env.element
if ((!env.element || !env.element.parentNode) && env.code) {
env.code = Normalizer.normalize(env.code, env.settings);
return;
}
// Normal mode
var pre = env.element.parentNode;
if (!env.code || !pre || pre.nodeName.toLowerCase() !== 'pre') {
return;
}
if (env.settings == null) { env.settings = {}; }
// Read settings from 'data-' attributes
for (var key in settingsConfig) {
if (Object.hasOwnProperty.call(settingsConfig, key)) {
var settingType = settingsConfig[key];
if (pre.hasAttribute('data-' + key)) {
try {
var value = JSON.parse(pre.getAttribute('data-' + key) || 'true');
if (typeof value === settingType) {
env.settings[key] = value;
}
} catch (_error) {
// ignore error
}
}
}
}
var children = pre.childNodes;
var before = '';
var after = '';
var codeFound = false;
// Move surrounding whitespace from the <pre> tag into the <code> tag
for (var i = 0; i < children.length; ++i) {
var node = children[i];
if (node == env.element) {
codeFound = true;
} else if (node.nodeName === '#text') {
if (codeFound) {
after += node.nodeValue;
} else {
before += node.nodeValue;
}
pre.removeChild(node);
--i;
}
}
if (!env.element.children.length || !Prism.plugins.KeepMarkup) {
env.code = before + env.code + after;
env.code = Normalizer.normalize(env.code, env.settings);
} else {
// Preserve markup for keep-markup plugin
var html = before + env.element.innerHTML + after;
env.element.innerHTML = Normalizer.normalize(html, env.settings);
env.code = env.element.textContent;
}
});
}());

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