hexo_util工具包分析1

hexo util包分析

index.js

'use strict';

exports.escapeDiacritic = require('./escape_diacritic');
exports.escapeHTML = require('./escape_html');
exports.escapeRegExp = require('./escape_regexp');
exports.highlight = require('./highlight');
exports.htmlTag = require('./html_tag');
exports.Pattern = require('./pattern');
exports.Permalink = require('./permalink');
exports.slugize = require('./slugize');
exports.spawn = require('./spawn');
exports.stripHTML = require('./strip_html');
exports.truncate = require('./truncate');
exports.wordWrap = require('./word_wrap');

导出了这么多工具类，我们先看slugize，因为关系到post创建的过程

var ctx = this.context;
var config = ctx.config;
//文章标题
data.slug = slugize((data.slug || data.title).toString(), {transform: config.filename_case});
data.layout = (data.layout || config.default_layout).toLowerCase();
data.date = data.date ? moment(data.date) : moment();

'use strict';
//最重要的就是这两个函数escapeDiacritic和escapeRegExp
var escapeDiacritic = require('./escape_diacritic');
var escapeRegExp = require('./escape_regexp');
var rControl = /[\u0000-\u001f]/g;
var rSpecial = /[\s~`!@#\$%\^&\*\(\)\-_\+=\[\]\{\}\|\\;:"'<>,\.\?\/]+/g;

module.exports = function(str, options){
  if (typeof str !== 'string') throw new TypeError('str must be a string!');
  options = options || {};

  var separator = options.separator || '-';
  var escapedSep = escapeRegExp(separator);// 输出\-

  var result = escapeDiacritic(str)
    // Remove control characters
    .replace(rControl, '')
    // Replace special characters
    .replace(rSpecial, separator)
    // Remove continous separators
    .replace(new RegExp(escapedSep + '{2,}', 'g'), separator)
      //n是一个非负整数。至少匹配n次。例如，“o{2,}”不能匹配“Bob”中的“o”，但能匹配“foooood”中的所有o。“o{1,}”等价于“o+”。“o{0,}”则等价于“o*”。
    // Remove prefixing and trailing separtors
    .replace(new RegExp('^' + escapedSep + '+|' + escapedSep + '+$', 'g'), '');

  switch (options.transform){
    case 1:
      return result.toLowerCase();

    case 2:
      return result.toUpperCase();

    default:
      return result;
  }
};