postcss,(plugins): nanocss, postcss-preset-env

1 files changed, 425 insertions, 0 deletions

diff --git a/node_modules/csso/lib/restructure/4-restructShorthand.js b/node_modules/csso/lib/restructure/4-restructShorthand.js
new file mode 100644
index 00000000..41acb515
--- /dev/null
+++ b/node_modules/csso/lib/restructure/4-restructShorthand.js
@@ -0,0 +1,425 @@
+import { List, generate, walk } from 'css-tree';
+
+const REPLACE = 1;
+const REMOVE = 2;
+const TOP = 0;
+const RIGHT = 1;
+const BOTTOM = 2;
+const LEFT = 3;
+const SIDES = ['top', 'right', 'bottom', 'left'];
+const 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'
+};
+const 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'
+};
+
+class TRBL {
+    constructor(name) {
+        this.name = name;
+        this.loc = null;
+        this.iehack = undefined;
+        this.sides = {
+            'top': null,
+            'right': null,
+            'bottom': null,
+            'left': null
+        };
+    }
+
+    getValueSequence(declaration, count) {
+        const values = [];
+        let iehack = '';
+        const hasBadValues = declaration.value.type !== 'Value' || declaration.value.children.some(function(child) {
+            let 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;
+
+                default:
+                    return true;  // bad value
+            }
+
+            values.push({
+                node: child,
+                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;
+    }
+
+    canOverride(side, value) {
+        const currentValue = this.sides[side];
+
+        return !currentValue || (value.important && !currentValue.important);
+    }
+
+    add(name, declaration) {
+        function attemptToAdd() {
+            const sides = this.sides;
+            const side = SIDE[name];
+
+            if (side) {
+                if (side in sides === false) {
+                    return false;
+                }
+
+                const values = this.getValueSequence(declaration, 1);
+
+                if (!values || !values.length) {
+                    return false;
+                }
+
+                // can mix only if specials are equal
+                for (const 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) {
+                const 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 (let i = 0; i < 4; i++) {
+                    for (const key in sides) {
+                        if (sides[key] !== null && sides[key].special !== values[i].special) {
+                            return false;
+                        }
+                    }
+                }
+
+                for (let 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;
+    }
+
+    isOkToMinimize() {
+        const top = this.sides.top;
+        const right = this.sides.right;
+        const bottom = this.sides.bottom;
+        const left = this.sides.left;
+
+        if (top && right && bottom && left) {
+            const important =
+                top.important +
+                right.important +
+                bottom.important +
+                left.important;
+
+            return important === 0 || important === 4;
+        }
+
+        return false;
+    }
+
+    getValue() {
+        const result = new List();
+        const sides = this.sides;
+        const values = [
+            sides.top,
+            sides.right,
+            sides.bottom,
+            sides.left
+        ];
+        const 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 (let i = 0; i < values.length; i++) {
+            result.appendData(values[i].node);
+        }
+
+        if (this.iehack) {
+            result.appendData({
+                type: 'Identifier',
+                loc: null,
+                name: this.iehack
+            });
+        }
+
+        return {
+            type: 'Value',
+            loc: null,
+            children: result
+        };
+    }
+
+    getDeclaration() {
+        return {
+            type: 'Declaration',
+            loc: this.loc,
+            important: this.sides.top.important,
+            property: this.name,
+            value: this.getValue()
+        };
+    }
+}
+
+function processRule(rule, shorts, shortDeclarations, lastShortSelector) {
+    const declarations = rule.block.children;
+    const selector = rule.prelude.children.first.id;
+
+    rule.block.children.forEachRight(function(declaration, item) {
+        const property = declaration.property;
+
+        if (!MAIN_PROPERTY.hasOwnProperty(property)) {
+            return;
+        }
+
+        const key = MAIN_PROPERTY[property];
+        let shorthand;
+        let 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,
+            block: declarations,
+            item,
+            shorthand
+        });
+
+        lastShortSelector = selector;
+    });
+
+    return lastShortSelector;
+}
+
+function processShorthands(shortDeclarations, markDeclaration) {
+    shortDeclarations.forEach(function(item) {
+        const shorthand = item.shorthand;
+
+        if (!shorthand.isOkToMinimize()) {
+            return;
+        }
+
+        if (item.operation === REPLACE) {
+            item.item.data = markDeclaration(shorthand.getDeclaration());
+        } else {
+            item.block.remove(item.item);
+        }
+    });
+}
+
+export default function restructBlock(ast, indexer) {
+    const stylesheetMap = {};
+    const shortDeclarations = [];
+
+    walk(ast, {
+        visit: 'Rule',
+        reverse: true,
+        enter(node) {
+            const stylesheet = this.block || this.stylesheet;
+            const ruleId = (node.pseudoSignature || '') + '|' + node.prelude.children.first.id;
+            let ruleMap;
+            let 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);
+};