build-scripts/extract-urls.js

   1 'use strict';
   2
   3 var postcss = require('postcss');
   4 var fs = require('fs');
   5 var path = require('path');
   6 var reduceFunctionCall = require('reduce-function-call');
   7 var url = require('url');
   8
   9 function extractUrls(input, basePath) {
  10   var resources = {};
  11
  12   function getFileName(value) {
  13     var u = url.parse(value);
  14     if (u.protocol || u.hostname) return value;
  15
  16     value = u.pathname;
  17
  18     if (value.indexOf('.') === 0) {
  19       var inputRelativeDir = path.dirname(path.relative(basePath, input));
  20       var relativeToPublicFilePath = path.join(inputRelativeDir, value);
  21       return path.join('public', relativeToPublicFilePath);
  22     }
  23
  24     return value;
  25   }
  26
  27   var css = postcss.parse(fs.readFileSync(input));
  28
  29   css.eachDecl(function(decl) {
  30     if (!decl.value) return;
  31
  32     if (decl.prop !== 'src' || decl.parent.name !== 'font-face') return;
  33
  34     if (!decl.parent.decls) return;
  35
  36     var d = decl.parent.decls.filter(function(d) {
  37       return d.prop === 'src' && d.parent.name === 'font-face';
  38     });
  39
  40     if (!d.length) return;
  41
  42     // var hasTtf = d.filter(function(x) {
  43     //   return x.value.indexOf('.ttf') >= 0;
  44     // });
  45
  46     // if(hasTtf.length) {
  47     //   decl.parent.decls = hasTtf;
  48     // }
  49   });
  50
  51   css.eachDecl(function(decl) {
  52     if (!decl.value) return;
  53
  54     var urls = [];
  55
  56     reduceFunctionCall(decl.value, 'url', function(value) {
  57       var m = /^['"]([^'"]*)['"]$/.exec(value);
  58       if (m) value = m[1];
  59
  60       value = getFileName(value);
  61
  62       urls.push(value);
  63     });
  64
  65     if (decl.prop === 'src' && decl.parent.name === 'font-face') {
  66       // If there are multiple fonts, choose the ttf
  67       var ttfs = urls.filter(function(v) {
  68         return /\.ttf/.test(v);
  69       });
  70
  71       if (ttfs.length > 0) {
  72         urls = ttfs;
  73       }
  74     }
  75
  76     urls.forEach(function(value) {
  77       resources[value] = true;
  78     });
  79   });
  80
  81   return Object.keys(resources);
  82 }
  83
  84 module.exports = extractUrls;