mirror of
https://github.com/idanoo/GoScrobble.git
synced 2024-11-24 09:25:15 +00:00
122 lines
3.8 KiB
JavaScript
122 lines
3.8 KiB
JavaScript
var postcss = require('postcss');
|
||
|
||
module.exports = postcss.plugin('postcss-media-minmax', function () {
|
||
return function(css) {
|
||
var feature_unit = {
|
||
'width': 'px',
|
||
'height': 'px',
|
||
'device-width': 'px',
|
||
'device-height': 'px',
|
||
'aspect-ratio': '',
|
||
'device-aspect-ratio': '',
|
||
'color': '',
|
||
'color-index': '',
|
||
'monochrome': '',
|
||
'resolution': 'dpi'
|
||
};
|
||
|
||
//支持 min-/max- 前缀的属性
|
||
var feature_name = Object.keys(feature_unit);
|
||
|
||
var step = .001; // smallest even number that won’t break complex queries (1in = 96px)
|
||
|
||
var power = {
|
||
'>': 1,
|
||
'<': -1
|
||
};
|
||
|
||
var minmax = {
|
||
'>': 'min',
|
||
'<': 'max'
|
||
};
|
||
|
||
function create_query(name, gtlt, eq, value, params) {
|
||
return value.replace(/([-\d\.]+)(.*)/, function (match, number, unit) {
|
||
var initialNumber = parseFloat(number);
|
||
|
||
if (parseFloat(number) || eq) {
|
||
// if eq is true, then number remains same
|
||
if (!eq) {
|
||
// change integer pixels value only on integer pixel
|
||
if (unit === 'px' && initialNumber === parseInt(number, 10)) {
|
||
number = initialNumber + power[gtlt];
|
||
} else {
|
||
number = Number(Math.round(parseFloat(number) + step * power[gtlt] + 'e6')+'e-6');
|
||
}
|
||
}
|
||
} else {
|
||
number = power[gtlt] + feature_unit[name];
|
||
}
|
||
|
||
return '(' + minmax[gtlt] + '-' + name + ': ' + number + unit + ')';
|
||
});
|
||
}
|
||
|
||
// 读取 media-feature
|
||
css.walkAtRules(function(rule, i) {
|
||
if (rule.name !== "media" && rule.name !== "custom-media") {
|
||
return
|
||
}
|
||
|
||
/**
|
||
* 转换 <mf-name> <|>= <mf-value>
|
||
* $1 $2 $3
|
||
* (width >= 300px) => (min-width: 300px)
|
||
* (width <= 900px) => (max-width: 900px)
|
||
*/
|
||
|
||
//取值不支持负值
|
||
//But -0 is always equivalent to 0 in CSS, and so is also accepted as a valid <mq-boolean> value.
|
||
|
||
rule.params = rule.params.replace(/\(\s*([a-z-]+?)\s*([<>])(=?)\s*((?:-?\d*\.?(?:\s*\/?\s*)?\d+[a-z]*)?)\s*\)/gi, function($0, $1, $2, $3, $4) {
|
||
|
||
var params = '';
|
||
|
||
if (feature_name.indexOf($1) > -1) {
|
||
return create_query($1, $2, $3, $4, rule.params);
|
||
}
|
||
//如果不是指定的属性，不做替换
|
||
return $0;
|
||
})
|
||
|
||
/**
|
||
* 转换 <mf-value> <|<= <mf-name> <|<= <mf-value>
|
||
* 转换 <mf-value> >|>= <mf-name> >|>= <mf-value>
|
||
* $1 $2$3 $4 $5$6 $7
|
||
* (500px <= width <= 1200px) => (min-width: 500px) and (max-width: 1200px)
|
||
* (500px < width <= 1200px) => (min-width: 501px) and (max-width: 1200px)
|
||
* (900px >= width >= 300px) => (min-width: 300px) and (max-width: 900px)
|
||
*/
|
||
|
||
rule.params = rule.params.replace(/\(\s*((?:-?\d*\.?(?:\s*\/?\s*)?\d+[a-z]*)?)\s*(<|>)(=?)\s*([a-z-]+)\s*(<|>)(=?)\s*((?:-?\d*\.?(?:\s*\/?\s*)?\d+[a-z]*)?)\s*\)/gi, function($0, $1, $2, $3, $4, $5, $6, $7) {
|
||
|
||
if (feature_name.indexOf($4) > -1) {
|
||
if ($2 === '<' && $5 === '<' || $2 === '>' && $5 === '>') {
|
||
var min = ($2 === '<') ? $1 : $7;
|
||
var max = ($2 === '<') ? $7 : $1;
|
||
|
||
// output differently depended on expression direction
|
||
// <mf-value> <|<= <mf-name> <|<= <mf-value>
|
||
// or
|
||
// <mf-value> >|>= <mf-name> >|>= <mf-value>
|
||
var equals_for_min = $3;
|
||
var equals_for_max = $6;
|
||
|
||
if ($2 === '>') {
|
||
equals_for_min = $6;
|
||
equals_for_max = $3;
|
||
}
|
||
|
||
return create_query($4, '>', equals_for_min, min) + ' and ' + create_query($4, '<', equals_for_max, max);
|
||
}
|
||
}
|
||
//如果不是指定的属性，不做替换
|
||
return $0;
|
||
|
||
});
|
||
|
||
});
|
||
|
||
}
|
||
});
|