2 * Copyright (C) 2018 Nick Downing <nick@ndcode.org>
3 * SPDX-License-Identifier: MIT
5 * Permission is hereby granted, free of charge, to any person obtaining a copy
6 * of this software and associated documentation files (the "Software"), to
7 * deal in the Software without restriction, including without limitation the
8 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
9 * sell copies of the Software, and to permit persons to whom the Software is
10 * furnished to do so, subject to the following conditions:
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
24 let BuildCache = require('@ndcode/build_cache')
25 let svgo = require('svgo')
26 let assert = require('assert')
27 let disk_build = require('@ndcode/disk_build')
28 let fs = require('fs')
29 let path = require('path')
30 let util = require('util')
32 let fs_readFile = util.promisify(fs.readFile)
33 let fs_writeFile = util.promisify(fs.writeFile)
35 let MinSVGCache = function(diag1, diag) {
36 if (!this instanceof MinSVGCache)
37 throw new Error('MinSVGCache is a constructor')
38 BuildCache.call(this, diag)
42 MinSVGCache.prototype = Object.create(BuildCache.prototype)
44 MinSVGCache.prototype.build = async function(key, result) {
45 let render = await disk_build(
47 async temp_pathname => {
48 // we will assume directory can be stripped from path when slugifying,
49 // it could cause problems with same-named SVGs in different directories
50 // when displayed on same page, but this seems quite unlikely to happen
51 let slug = path.basename(key, '.svg')
53 let render = await svgo.optimize(
54 await fs_readFile(key, {encoding: 'utf-8'}),
59 {name: 'cleanupAttrs'},
60 {name: 'removeDoctype'},
61 {name: 'removeXMLProcInst'},
62 {name: 'removeComments'},
63 {name: 'removeMetadata'},
64 {name: 'removeTitle'},
66 {name: 'removeUselessDefs'},
67 {name: 'removeEditorsNSData'},
68 {name: 'removeEmptyAttrs'},
69 {name: 'removeHiddenElems'},
70 {name: 'removeEmptyText'},
71 {name: 'removeEmptyContainers'},
72 //{name: 'removeViewBox'},
73 {name: 'cleanupEnableBackground'},
74 {name: 'convertStyleToAttrs'},
75 {name: 'convertColors'},
76 {name: 'convertPathData'},
77 {name: 'convertTransform'},
78 {name: 'removeUnknownsAndDefaults'},
79 {name: 'removeNonInheritableGroupAttrs'},
80 {name: 'removeUselessStrokeAndFill'},
81 {name: 'removeUnusedNS'},
82 {name: 'cleanupIDs', params: {prefix: slug + '_'}},
83 {name: 'cleanupNumericValues'},
84 {name: 'moveElemsAttrsToGroup'},
85 {name: 'moveGroupAttrsToElems'},
86 {name: 'collapseGroups'},
87 //{name: 'removeRasterImages'},
89 {name: 'convertShapeToPath'},
90 {name: 'sortAttrs'} //,
91 //{name: 'removeDimensions'}//,
92 //{name: 'removeAttrs', params: {attrs: '(stroke|fill)'}}
97 throw new Error(render.error)
99 return /*await*/ fs_writeFile(
107 assert(render.deps.length === 0)
108 result.value = await fs_readFile(render.pathname)
111 module.exports = MinSVGCache