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authorSamy Pessé <samypesse@gmail.com>2016-04-22 11:00:21 +0200
committerSamy Pessé <samypesse@gmail.com>2016-04-22 11:00:21 +0200
commit4336fdb2414d460ffee68a0cc87c0cb0c85cf56e (patch)
tree279f711ab98666c892c19a7b9e4073a094f03f98 /lib/output/assets-inliner.js
parent87db7cf1d412fa6fbd18e9a7e4f4755f2c0c5547 (diff)
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-rw-r--r--lib/output/assets-inliner.js140
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diff --git a/lib/output/assets-inliner.js b/lib/output/assets-inliner.js
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@@ -1,140 +0,0 @@
-var util = require('util');
-var path = require('path');
-var crc = require('crc');
-
-var FolderOutput = require('./folder')();
-var Promise = require('../utils/promise');
-var fs = require('../utils/fs');
-var imagesUtil = require('../utils/images');
-var location = require('../utils/location');
-
-var DEFAULT_ASSETS_FOLDER = 'assets';
-
-/*
-Mixin to inline all the assets in a book:
- - Outline <svg> tags
- - Download remote images
- - Convert .svg images as png
-*/
-
-module.exports = function assetsInliner(Base) {
- Base = Base || FolderOutput;
-
- function AssetsInliner() {
- Base.apply(this, arguments);
-
- // Map of svg already converted
- this.svgs = {};
- this.inlineSvgs = {};
-
- // Map of images already downloaded
- this.downloaded = {};
- }
- util.inherits(AssetsInliner, Base);
-
- // Output a SVG buffer as a file
- AssetsInliner.prototype.onOutputSVG = function(page, svg) {
- this.log.debug.ln('output svg from', page.path);
-
- // Convert svg buffer to a png file
- return this.convertSVGBuffer(svg)
-
- // Return relative path from the page
- .then(function(filename) {
- return page.relative('/' + filename);
- });
- };
-
-
- // Output an image as a file
- AssetsInliner.prototype.onOutputImage = function(page, src) {
- var that = this;
-
- return Promise()
-
- // Download file if external
- .then(function() {
- if (!location.isExternal(src)) return;
-
- return that.downloadAsset(src)
- .then(function(_asset) {
- src = '/' + _asset;
- });
-
- })
- .then(function() {
- // Resolve src to a relative filepath to the book's root
- src = page.resolveLocal(src);
-
- // Already a PNG/JPG/.. ?
- if (path.extname(src).toLowerCase() != '.svg') {
- return src;
- }
-
- // Convert SVG to PNG
- return that.convertSVGFile(that.resolve(src));
- })
-
- // Return relative path from the page
- .then(function(filename) {
- return page.relative(filename);
- });
- };
-
- // Download an asset if not already download; returns the output file
- AssetsInliner.prototype.downloadAsset = function(src) {
- if (this.downloaded[src]) return Promise(this.downloaded[src]);
-
- var that = this;
- var ext = path.extname(src);
- var hash = crc.crc32(src).toString(16);
-
- // Create new file
- return this.createNewFile(DEFAULT_ASSETS_FOLDER, hash + ext)
- .then(function(filename) {
- that.downloaded[src] = filename;
-
- that.log.debug.ln('downloading asset', src);
- return fs.download(src, that.resolve(filename))
- .thenResolve(filename);
- });
- };
-
- // Convert a .svg into an .png
- // Return the output filename for the .png
- AssetsInliner.prototype.convertSVGFile = function(src) {
- if (this.svgs[src]) return Promise(this.svgs[src]);
-
- var that = this;
- var hash = crc.crc32(src).toString(16);
-
- // Create new file
- return this.createNewFile(DEFAULT_ASSETS_FOLDER, hash + '.png')
- .then(function(filename) {
- that.svgs[src] = filename;
-
- return imagesUtil.convertSVGToPNG(src, that.resolve(filename))
- .thenResolve(filename);
- });
- };
-
- // Convert an inline svg into an .png
- // Return the output filename for the .png
- AssetsInliner.prototype.convertSVGBuffer = function(buf) {
- var that = this;
- var hash = crc.crc32(buf).toString(16);
-
- // Already converted?
- if (this.inlineSvgs[hash]) return Promise(this.inlineSvgs[hash]);
-
- return this.createNewFile(DEFAULT_ASSETS_FOLDER, hash + '.png')
- .then(function(filename) {
- that.inlineSvgs[hash] = filename;
-
- return imagesUtil.convertSVGBufferToPNG(buf, that.resolve(filename))
- .thenResolve(filename);
- });
- };
-
- return AssetsInliner;
-};