supports.js

'use strict';

var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

var Browsers = require('./browsers');
var brackets = require('./brackets');
var Value = require('./value');
var utils = require('./utils');

var postcss = require('postcss');

var supported = [];
var data = require('caniuse-lite').feature(require('caniuse-lite/data/features/css-featurequeries.js'));
for (var browser in data.stats) {
    var versions = data.stats[browser];
    for (var version in versions) {
        var support = versions[version];
        if (/y/.test(support)) {
            supported.push(browser + ' ' + version);
        }
    }
}

var Supports = function () {
    function Supports(Prefixes, all) {
        _classCallCheck(this, Supports);

        this.Prefixes = Prefixes;
        this.all = all;
    }

    /**
     * Return prefixer only with @supports supported browsers
     */


    Supports.prototype.prefixer = function prefixer() {
        if (this.prefixerCache) {
            return this.prefixerCache;
        }

        var filtered = this.all.browsers.selected.filter(function (i) {
            return supported.indexOf(i) !== -1;
        });

        var browsers = new Browsers(this.all.browsers.data, filtered, this.all.options);
        this.prefixerCache = new this.Prefixes(this.all.data, browsers, this.all.options);
        return this.prefixerCache;
    };

    /**
     * Parse string into declaration property and value
     */


    Supports.prototype.parse = function parse(str) {
        var _str$split = str.split(':'),
            prop = _str$split[0],
            value = _str$split[1];

        if (!value) value = '';
        return [prop.trim(), value.trim()];
    };

    /**
     * Create virtual rule to process it by prefixer
     */


    Supports.prototype.virtual = function virtual(str) {
        var _parse = this.parse(str),
            prop = _parse[0],
            value = _parse[1];

        var rule = postcss.parse('a{}').first;
        rule.append({ prop: prop, value: value, raws: { before: '' } });
        return rule;
    };

    /**
     * Return array of Declaration with all necessary prefixes
     */


    Supports.prototype.prefixed = function prefixed(str) {
        var rule = this.virtual(str);
        if (this.disabled(rule.first)) {
            return rule.nodes;
        }

        var prefixer = this.prefixer().add[rule.first.prop];
        prefixer && prefixer.process && prefixer.process(rule.first);

        for (var _iterator = rule.nodes, _isArray = Array.isArray(_iterator), _i = 0, _iterator = _isArray ? _iterator : _iterator[Symbol.iterator]();;) {
            var _ref;

            if (_isArray) {
                if (_i >= _iterator.length) break;
                _ref = _iterator[_i++];
            } else {
                _i = _iterator.next();
                if (_i.done) break;
                _ref = _i.value;
            }

            var decl = _ref;

            for (var _iterator2 = this.prefixer().values('add', rule.first.prop), _isArray2 = Array.isArray(_iterator2), _i2 = 0, _iterator2 = _isArray2 ? _iterator2 : _iterator2[Symbol.iterator]();;) {
                var _ref2;

                if (_isArray2) {
                    if (_i2 >= _iterator2.length) break;
                    _ref2 = _iterator2[_i2++];
                } else {
                    _i2 = _iterator2.next();
                    if (_i2.done) break;
                    _ref2 = _i2.value;
                }

                var value = _ref2;

                value.process(decl);
            }
            Value.save(this.all, decl);
        }

        return rule.nodes;
    };

    /**
     * Return true if brackets node is "not" word
     */


    Supports.prototype.isNot = function isNot(node) {
        return typeof node === 'string' && /not\s*/i.test(node);
    };

    /**
     * Return true if brackets node is "or" word
     */


    Supports.prototype.isOr = function isOr(node) {
        return typeof node === 'string' && /\s*or\s*/i.test(node);
    };

    /**
     * Return true if brackets node is (prop: value)
     */


    Supports.prototype.isProp = function isProp(node) {
        return (typeof node === 'undefined' ? 'undefined' : _typeof(node)) === 'object' && node.length === 1 && typeof node[0] === 'string';
    };

    /**
     * Return true if prefixed property has no unprefixed
     */


    Supports.prototype.isHack = function isHack(all, unprefixed) {
        var check = new RegExp('(\\(|\\s)' + utils.escapeRegexp(unprefixed) + ':');
        return !check.test(all);
    };

    /**
     * Return true if we need to remove node
     */


    Supports.prototype.toRemove = function toRemove(str, all) {
        var _parse2 = this.parse(str),
            prop = _parse2[0],
            value = _parse2[1];

        var unprefixed = this.all.unprefixed(prop);

        var cleaner = this.all.cleaner();

        if (cleaner.remove[prop] && cleaner.remove[prop].remove && !this.isHack(all, unprefixed)) {
            return true;
        }

        for (var _iterator3 = cleaner.values('remove', unprefixed), _isArray3 = Array.isArray(_iterator3), _i3 = 0, _iterator3 = _isArray3 ? _iterator3 : _iterator3[Symbol.iterator]();;) {
            var _ref3;

            if (_isArray3) {
                if (_i3 >= _iterator3.length) break;
                _ref3 = _iterator3[_i3++];
            } else {
                _i3 = _iterator3.next();
                if (_i3.done) break;
                _ref3 = _i3.value;
            }

            var checker = _ref3;

            if (checker.check(value)) {
                return true;
            }
        }

        return false;
    };

    /**
     * Remove all unnecessary prefixes
     */


    Supports.prototype.remove = function remove(nodes, all) {
        var i = 0;
        while (i < nodes.length) {
            if (!this.isNot(nodes[i - 1]) && this.isProp(nodes[i]) && this.isOr(nodes[i + 1])) {
                if (this.toRemove(nodes[i][0], all)) {
                    nodes.splice(i, 2);
                    continue;
                }

                i += 2;
                continue;
            }

            if (_typeof(nodes[i]) === 'object') {
                nodes[i] = this.remove(nodes[i], all);
            }

            i += 1;
        }
        return nodes;
    };

    /**
     * Clean brackets with one child
     */


    Supports.prototype.cleanBrackets = function cleanBrackets(nodes) {
        var _this = this;

        return nodes.map(function (i) {
            if ((typeof i === 'undefined' ? 'undefined' : _typeof(i)) !== 'object') {
                return i;
            }

            if (i.length === 1 && _typeof(i[0]) === 'object') {
                return _this.cleanBrackets(i[0]);
            }

            return _this.cleanBrackets(i);
        });
    };

    /**
     * Add " or " between properties and convert it to brackets format
     */


    Supports.prototype.convert = function convert(progress) {
        var result = [''];
        for (var _iterator4 = progress, _isArray4 = Array.isArray(_iterator4), _i4 = 0, _iterator4 = _isArray4 ? _iterator4 : _iterator4[Symbol.iterator]();;) {
            var _ref4;

            if (_isArray4) {
                if (_i4 >= _iterator4.length) break;
                _ref4 = _iterator4[_i4++];
            } else {
                _i4 = _iterator4.next();
                if (_i4.done) break;
                _ref4 = _i4.value;
            }

            var i = _ref4;

            result.push([i.prop + ': ' + i.value]);
            result.push(' or ');
        }
        result[result.length - 1] = '';
        return result;
    };

    /**
     * Compress value functions into a string nodes
     */


    Supports.prototype.normalize = function normalize(nodes) {
        var _this2 = this;

        if ((typeof nodes === 'undefined' ? 'undefined' : _typeof(nodes)) !== 'object') {
            return nodes;
        }

        nodes = nodes.filter(function (i) {
            return i !== '';
        });
        if (typeof nodes[0] === 'string' && nodes[0].indexOf(':') !== -1) {
            return [brackets.stringify(nodes)];
        }

        return nodes.map(function (i) {
            return _this2.normalize(i);
        });
    };

    /**
     * Add prefixes
     */


    Supports.prototype.add = function add(nodes, all) {
        var _this3 = this;

        return nodes.map(function (i) {
            if (_this3.isProp(i)) {
                var prefixed = _this3.prefixed(i[0]);
                if (prefixed.length > 1) {
                    return _this3.convert(prefixed);
                }

                return i;
            }

            if ((typeof i === 'undefined' ? 'undefined' : _typeof(i)) === 'object') {
                return _this3.add(i, all);
            }

            return i;
        });
    };

    /**
     * Add prefixed declaration
     */


    Supports.prototype.process = function process(rule) {
        var ast = brackets.parse(rule.params);
        ast = this.normalize(ast);
        ast = this.remove(ast, rule.params);
        ast = this.add(ast, rule.params);
        ast = this.cleanBrackets(ast);
        rule.params = brackets.stringify(ast);
    };

    /**
     * Check global options
     */


    Supports.prototype.disabled = function disabled(node) {
        if (!this.all.options.grid) {
            if (node.prop === 'display' && node.value.indexOf('grid') !== -1) {
                return true;
            }
            if (node.prop.indexOf('grid') !== -1 || node.prop === 'justify-items') {
                return true;
            }
        }

        if (this.all.options.flexbox === false) {
            if (node.prop === 'display' && node.value.indexOf('flex') !== -1) {
                return true;
            }
            var other = ['order', 'justify-content', 'align-items', 'align-content'];
            if (node.prop.indexOf('flex') !== -1 || other.indexOf(node.prop) !== -1) {
                return true;
            }
        }

        return false;
    };

    return Supports;
}();

module.exports = Supports;