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Current File : /home/web/dev.agtindia.co.in/lrg-report/node_modules/csso/lib/restructure/4-restructShorthand.js
var List = require('css-tree').List;
var generate = require('css-tree').generate;
var walk = require('css-tree').walk;

var REPLACE = 1;
var REMOVE = 2;
var TOP = 0;
var RIGHT = 1;
var BOTTOM = 2;
var LEFT = 3;
var SIDES = ['top', 'right', 'bottom', 'left'];
var SIDE = {
    'margin-top': 'top',
    'margin-right': 'right',
    'margin-bottom': 'bottom',
    'margin-left': 'left',

    'padding-top': 'top',
    'padding-right': 'right',
    'padding-bottom': 'bottom',
    'padding-left': 'left',

    'border-top-color': 'top',
    'border-right-color': 'right',
    'border-bottom-color': 'bottom',
    'border-left-color': 'left',
    'border-top-width': 'top',
    'border-right-width': 'right',
    'border-bottom-width': 'bottom',
    'border-left-width': 'left',
    'border-top-style': 'top',
    'border-right-style': 'right',
    'border-bottom-style': 'bottom',
    'border-left-style': 'left'
};
var MAIN_PROPERTY = {
    'margin': 'margin',
    'margin-top': 'margin',
    'margin-right': 'margin',
    'margin-bottom': 'margin',
    'margin-left': 'margin',

    'padding': 'padding',
    'padding-top': 'padding',
    'padding-right': 'padding',
    'padding-bottom': 'padding',
    'padding-left': 'padding',

    'border-color': 'border-color',
    'border-top-color': 'border-color',
    'border-right-color': 'border-color',
    'border-bottom-color': 'border-color',
    'border-left-color': 'border-color',
    'border-width': 'border-width',
    'border-top-width': 'border-width',
    'border-right-width': 'border-width',
    'border-bottom-width': 'border-width',
    'border-left-width': 'border-width',
    'border-style': 'border-style',
    'border-top-style': 'border-style',
    'border-right-style': 'border-style',
    'border-bottom-style': 'border-style',
    'border-left-style': 'border-style'
};

function TRBL(name) {
    this.name = name;
    this.loc = null;
    this.iehack = undefined;
    this.sides = {
        'top': null,
        'right': null,
        'bottom': null,
        'left': null
    };
}

TRBL.prototype.getValueSequence = function(declaration, count) {
    var values = [];
    var iehack = '';
    var hasBadValues = declaration.value.type !== 'Value' || declaration.value.children.some(function(child) {
        var special = false;

        switch (child.type) {
            case 'Identifier':
                switch (child.name) {
                    case '\\0':
                    case '\\9':
                        iehack = child.name;
                        return;

                    case 'inherit':
                    case 'initial':
                    case 'unset':
                    case 'revert':
                        special = child.name;
                        break;
                }
                break;

            case 'Dimension':
                switch (child.unit) {
                    // is not supported until IE11
                    case 'rem':

                    // v* units is too buggy across browsers and better
                    // don't merge values with those units
                    case 'vw':
                    case 'vh':
                    case 'vmin':
                    case 'vmax':
                    case 'vm': // IE9 supporting "vm" instead of "vmin".
                        special = child.unit;
                        break;
                }
                break;

            case 'Hash': // color
            case 'Number':
            case 'Percentage':
                break;

            case 'Function':
                if (child.name === 'var') {
                    return true;
                }

                special = child.name;
                break;

            case 'WhiteSpace':
                return false; // ignore space

            default:
                return true;  // bad value
        }

        values.push({
            node: child,
            special: special,
            important: declaration.important
        });
    });

    if (hasBadValues || values.length > count) {
        return false;
    }

    if (typeof this.iehack === 'string' && this.iehack !== iehack) {
        return false;
    }

    this.iehack = iehack; // move outside

    return values;
};

TRBL.prototype.canOverride = function(side, value) {
    var currentValue = this.sides[side];

    return !currentValue || (value.important && !currentValue.important);
};

TRBL.prototype.add = function(name, declaration) {
    function attemptToAdd() {
        var sides = this.sides;
        var side = SIDE[name];

        if (side) {
            if (side in sides === false) {
                return false;
            }

            var values = this.getValueSequence(declaration, 1);

            if (!values || !values.length) {
                return false;
            }

            // can mix only if specials are equal
            for (var key in sides) {
                if (sides[key] !== null && sides[key].special !== values[0].special) {
                    return false;
                }
            }

            if (!this.canOverride(side, values[0])) {
                return true;
            }

            sides[side] = values[0];
            return true;
        } else if (name === this.name) {
            var values = this.getValueSequence(declaration, 4);

            if (!values || !values.length) {
                return false;
            }

            switch (values.length) {
                case 1:
                    values[RIGHT] = values[TOP];
                    values[BOTTOM] = values[TOP];
                    values[LEFT] = values[TOP];
                    break;

                case 2:
                    values[BOTTOM] = values[TOP];
                    values[LEFT] = values[RIGHT];
                    break;

                case 3:
                    values[LEFT] = values[RIGHT];
                    break;
            }

            // can mix only if specials are equal
            for (var i = 0; i < 4; i++) {
                for (var key in sides) {
                    if (sides[key] !== null && sides[key].special !== values[i].special) {
                        return false;
                    }
                }
            }

            for (var i = 0; i < 4; i++) {
                if (this.canOverride(SIDES[i], values[i])) {
                    sides[SIDES[i]] = values[i];
                }
            }

            return true;
        }
    }

    if (!attemptToAdd.call(this)) {
        return false;
    }

    // TODO: use it when we can refer to several points in source
    // if (this.loc) {
    //     this.loc = {
    //         primary: this.loc,
    //         merged: declaration.loc
    //     };
    // } else {
    //     this.loc = declaration.loc;
    // }
    if (!this.loc) {
        this.loc = declaration.loc;
    }

    return true;
};

TRBL.prototype.isOkToMinimize = function() {
    var top = this.sides.top;
    var right = this.sides.right;
    var bottom = this.sides.bottom;
    var left = this.sides.left;

    if (top && right && bottom && left) {
        var important =
            top.important +
            right.important +
            bottom.important +
            left.important;

        return important === 0 || important === 4;
    }

    return false;
};

TRBL.prototype.getValue = function() {
    var result = new List();
    var sides = this.sides;
    var values = [
        sides.top,
        sides.right,
        sides.bottom,
        sides.left
    ];
    var stringValues = [
        generate(sides.top.node),
        generate(sides.right.node),
        generate(sides.bottom.node),
        generate(sides.left.node)
    ];

    if (stringValues[LEFT] === stringValues[RIGHT]) {
        values.pop();
        if (stringValues[BOTTOM] === stringValues[TOP]) {
            values.pop();
            if (stringValues[RIGHT] === stringValues[TOP]) {
                values.pop();
            }
        }
    }

    for (var i = 0; i < values.length; i++) {
        if (i) {
            result.appendData({ type: 'WhiteSpace', value: ' ' });
        }

        result.appendData(values[i].node);
    }

    if (this.iehack) {
        result.appendData({ type: 'WhiteSpace', value: ' ' });
        result.appendData({
            type: 'Identifier',
            loc: null,
            name: this.iehack
        });
    }

    return {
        type: 'Value',
        loc: null,
        children: result
    };
};

TRBL.prototype.getDeclaration = function() {
    return {
        type: 'Declaration',
        loc: this.loc,
        important: this.sides.top.important,
        property: this.name,
        value: this.getValue()
    };
};

function processRule(rule, shorts, shortDeclarations, lastShortSelector) {
    var declarations = rule.block.children;
    var selector = rule.prelude.children.first().id;

    rule.block.children.eachRight(function(declaration, item) {
        var property = declaration.property;

        if (!MAIN_PROPERTY.hasOwnProperty(property)) {
            return;
        }

        var key = MAIN_PROPERTY[property];
        var shorthand;
        var operation;

        if (!lastShortSelector || selector === lastShortSelector) {
            if (key in shorts) {
                operation = REMOVE;
                shorthand = shorts[key];
            }
        }

        if (!shorthand || !shorthand.add(property, declaration)) {
            operation = REPLACE;
            shorthand = new TRBL(key);

            // if can't parse value ignore it and break shorthand children
            if (!shorthand.add(property, declaration)) {
                lastShortSelector = null;
                return;
            }
        }

        shorts[key] = shorthand;
        shortDeclarations.push({
            operation: operation,
            block: declarations,
            item: item,
            shorthand: shorthand
        });

        lastShortSelector = selector;
    });

    return lastShortSelector;
}

function processShorthands(shortDeclarations, markDeclaration) {
    shortDeclarations.forEach(function(item) {
        var shorthand = item.shorthand;

        if (!shorthand.isOkToMinimize()) {
            return;
        }

        if (item.operation === REPLACE) {
            item.item.data = markDeclaration(shorthand.getDeclaration());
        } else {
            item.block.remove(item.item);
        }
    });
}

module.exports = function restructBlock(ast, indexer) {
    var stylesheetMap = {};
    var shortDeclarations = [];

    walk(ast, {
        visit: 'Rule',
        reverse: true,
        enter: function(node) {
            var stylesheet = this.block || this.stylesheet;
            var ruleId = (node.pseudoSignature || '') + '|' + node.prelude.children.first().id;
            var ruleMap;
            var shorts;

            if (!stylesheetMap.hasOwnProperty(stylesheet.id)) {
                ruleMap = {
                    lastShortSelector: null
                };
                stylesheetMap[stylesheet.id] = ruleMap;
            } else {
                ruleMap = stylesheetMap[stylesheet.id];
            }

            if (ruleMap.hasOwnProperty(ruleId)) {
                shorts = ruleMap[ruleId];
            } else {
                shorts = {};
                ruleMap[ruleId] = shorts;
            }

            ruleMap.lastShortSelector = processRule.call(this, node, shorts, shortDeclarations, ruleMap.lastShortSelector);
        }
    });

    processShorthands(shortDeclarations, indexer.declaration);
};

Youez - 2016 - github.com/yon3zu
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