index.js
4.75 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
'use strict';
var postcss = require('postcss');
var objectAssign = require('object-assign');
var { createPropListMatcher } = require('./src/prop-list-matcher');
var { getUnitRegexp } = require('./src/pixel-unit-regexp');
var defaults = {
unitToConvert: 'px',
viewportWidth: 320,
viewportHeight: 568, // not now used; TODO: need for different units and math for different properties
unitPrecision: 5,
viewportUnit: 'vw',
fontViewportUnit: 'vw', // vmin is more suitable.
selectorBlackList: [],
propList: ['*'],
minPixelValue: 1,
mediaQuery: false,
replace: true,
landscape: false,
landscapeUnit: 'vw',
landscapeWidth: 568
};
module.exports = postcss.plugin('postcss-px-to-viewport', function (options) {
var opts = objectAssign({}, defaults, options);
var pxRegex = getUnitRegexp(opts.unitToConvert);
var satisfyPropList = createPropListMatcher(opts.propList);
var landscapeRules = [];
return function (css) {
css.walkRules(function (rule) {
// Add exclude option to ignore some files like 'node_modules'
var file = rule.source && rule.source.input.file;
if (opts.exclude && file) {
if (Object.prototype.toString.call(opts.exclude) === '[object RegExp]') {
if (isExclude(opts.exclude, file)) return;
} else if (Object.prototype.toString.call(opts.exclude) === '[object Array]') {
for (let i = 0; i < opts.exclude.length; i++) {
if (isExclude(opts.exclude[i], file)) return;
}
} else {
throw new Error('options.exclude should be RegExp or Array.');
}
}
if (blacklistedSelector(opts.selectorBlackList, rule.selector)) return;
if (opts.landscape && !rule.parent.params) {
var landscapeRule = rule.clone().removeAll();
rule.walkDecls(function(decl) {
if (decl.value.indexOf(opts.unitToConvert) === -1) return;
if (!satisfyPropList(decl.prop)) return;
landscapeRule.append(decl.clone({
value: decl.value.replace(pxRegex, createPxReplace(opts, opts.landscapeUnit, opts.landscapeWidth))
}));
});
if (landscapeRule.nodes.length > 0) {
landscapeRules.push(landscapeRule);
}
}
if (!validateParams(rule.parent.params, opts.mediaQuery)) return;
rule.walkDecls(function(decl, i) {
if (decl.value.indexOf(opts.unitToConvert) === -1) return;
if (!satisfyPropList(decl.prop)) return;
var unit;
var size;
var params = rule.parent.params;
if (opts.landscape && params && params.indexOf('landscape') !== -1) {
unit = opts.landscapeUnit;
size = opts.landscapeWidth;
} else {
unit = getUnit(decl.prop, opts);
size = opts.viewportWidth;
}
var value = decl.value.replace(pxRegex, createPxReplace(opts, unit, size));
if (declarationExists(decl.parent, decl.prop, value)) return;
if (opts.replace) {
decl.value = value;
} else {
decl.parent.insertAfter(i, decl.clone({ value: value }));
}
});
});
if (landscapeRules.length > 0) {
var landscapeRoot = new postcss.atRule({ params: '(orientation: landscape)', name: 'media' });
landscapeRules.forEach(function(rule) {
landscapeRoot.append(rule);
});
css.append(landscapeRoot);
}
};
});
function getUnit(prop, opts) {
return prop.indexOf('font') === -1 ? opts.viewportUnit : opts.fontViewportUnit;
}
function createPxReplace(opts, viewportUnit, viewportSize) {
return function (m, $1) {
if (!$1) return m;
var pixels = parseFloat($1);
if (pixels <= opts.minPixelValue) return m;
var parsedVal = toFixed((pixels / viewportSize * 100), opts.unitPrecision);
return parsedVal === 0 ? '0' : parsedVal + viewportUnit;
};
}
function toFixed(number, precision) {
var multiplier = Math.pow(10, precision + 1),
wholeNumber = Math.floor(number * multiplier);
return Math.round(wholeNumber / 10) * 10 / multiplier;
}
function blacklistedSelector(blacklist, selector) {
if (typeof selector !== 'string') return;
return blacklist.some(function (regex) {
if (typeof regex === 'string') return selector.indexOf(regex) !== -1;
return selector.match(regex);
});
}
function isExclude(reg, file) {
if (Object.prototype.toString.call(reg) !== '[object RegExp]') {
throw new Error('options.exclude should be RegExp.');
}
return file.match(reg) !== null;
}
function declarationExists(decls, prop, value) {
return decls.some(function (decl) {
return (decl.prop === prop && decl.value === value);
});
}
function validateParams(params, mediaQuery) {
return !params || (params && mediaQuery);
}