const cfg = require('./config.js'), isLetter = c => (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'); function CssHandler(tagStyle) { var styles = Object.assign(Object.create(null), cfg.userAgentStyles); for (var item in tagStyle) styles[item] = (styles[item] ? styles[item] + ';' : '') + tagStyle[item]; this.styles = styles; } CssHandler.prototype.getStyle = function(data) { this.styles = new parser(data, this.styles).parse(); } CssHandler.prototype.match = function(name, attrs) { var tmp, matched = (tmp = this.styles[name]) ? tmp + ';' : ''; if (attrs.class) { var items = attrs.class.split(' '); for (var i = 0, item; item = items[i]; i++) if (tmp = this.styles['.' + item]) matched += tmp + ';'; } if (tmp = this.styles['#' + attrs.id]) matched += tmp + ';'; return matched; } module.exports = CssHandler; function parser(data, init) { this.data = data; this.floor = 0; this.i = 0; this.list = []; this.res = init; this.state = this.Space; } parser.prototype.parse = function() { for (var c; c = this.data[this.i]; this.i++) this.state(c); return this.res; } parser.prototype.section = function() { return this.data.substring(this.start, this.i); } // 状态机 parser.prototype.Space = function(c) { if (c == '.' || c == '#' || isLetter(c)) { this.start = this.i; this.state = this.Name; } else if (c == '/' && this.data[this.i + 1] == '*') this.Comment(); else if (!cfg.blankChar[c] && c != ';') this.state = this.Ignore; } parser.prototype.Comment = function() { this.i = this.data.indexOf('*/', this.i) + 1; if (!this.i) this.i = this.data.length; this.state = this.Space; } parser.prototype.Ignore = function(c) { if (c == '{') this.floor++; else if (c == '}' && !--this.floor) { this.list = []; this.state = this.Space; } } parser.prototype.Name = function(c) { if (cfg.blankChar[c]) { this.list.push(this.section()); this.state = this.NameSpace; } else if (c == '{') { this.list.push(this.section()); this.Content(); } else if (c == ',') { this.list.push(this.section()); this.Comma(); } else if (!isLetter(c) && (c < '0' || c > '9') && c != '-' && c != '_') this.state = this.Ignore; } parser.prototype.NameSpace = function(c) { if (c == '{') this.Content(); else if (c == ',') this.Comma(); else if (!cfg.blankChar[c]) this.state = this.Ignore; } parser.prototype.Comma = function() { while (cfg.blankChar[this.data[++this.i]]); if (this.data[this.i] == '{') this.Content(); else { this.start = this.i--; this.state = this.Name; } } parser.prototype.Content = function() { this.start = ++this.i; if ((this.i = this.data.indexOf('}', this.i)) == -1) this.i = this.data.length; var content = this.section(); for (var i = 0, item; item = this.list[i++];) if (this.res[item]) this.res[item] += ';' + content; else this.res[item] = content; this.list = []; this.state = this.Space; }