all files / src/ parseSelector.js

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"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const postcssSelectorParser = require("postcss-selector-parser");
const cssIntrospection_1 = require("./util/cssIntrospection");
const { isContainer, isPseudo, isPseudoElement, isRoot, isSelector, } = postcssSelectorParser;
class CombinedSelector {
    setNext(combinator, selector) {
        this.next = {
            combinator: combinator,
            selector: selector,
        };
    }
}
exports.CombinedSelector = CombinedSelector;
/**
 * Core structure in `CompoundSelector` linked lists. Keeps reference to the next
 * `CompoundSelector` in the chan, and the combinator that connects them.
 */
class CompoundSelector extends CombinedSelector {
    constructor() {
        super();
        this.nodes = [];
    }
    /**
     * Crawl the linked list and return last sibling.
     * @return The last `CompoundSelector` in list
     */
    get lastSibling() {
        let lastSibling = this;
        while (lastSibling.next) {
            lastSibling = lastSibling.next.selector;
        }
        return lastSibling;
    }
    /**
     * Add a node to `CompoundSelector`.
     * @param Simple selector node to add.
     */
    addNode(node) {
        this.nodes.push(node);
    }
    /**
     * Set pseudo element type on this `CompoundSelector`.
     * @param The `selectorParser.Pseudo` to assign.
     */
    setPseudoelement(pseudo) {
        this.pseudoelement = pseudo;
    }
    /**
     * Insert a new `CompoundSelector` before another in the linked list.
     * @param other The `CompoundSelector` to insert.
     * @param combinator The combinator connecting these two selectors.
     * @param reference The `CompoundSelector` to insert this selector before.
     */
    insertBefore(other, combinator, reference) {
        if (this.next && this.next.selector === reference) {
            let otherEnd = other.lastSibling;
            otherEnd.next = {
                combinator: combinator,
                selector: this.next.selector,
            };
            this.next.selector = other;
            return true;
        }
        else if (this.next) {
            return this.next.selector.insertBefore(other, combinator, reference);
        }
        else {
            return false;
        }
    }
    /**
     * Append a new `CompoundSelector` to the linked list.
     * @param combinator The combinator connecting the new selectors.
     * @param selector The `CompoundSelector` to append.
     * @return This `CompoundSelector`.
     */
    append(combinator, selector) {
        this.lastSibling.next = {
            combinator: combinator,
            selector: selector,
        };
        return this;
    }
    /**
     * Merge this `CompoundSelector` with another.
     * @param other The `CompoundSelector` to merge with this one.
     * @return This `CompoundSelector`.
     */
    mergeNodes(other) {
        let foundNodes = new Set();
        let pseudos = [];
        let nodes = [];
        let filterNodes = function (node) {
            let nodeStr = node.toString();
            if (!foundNodes.has(nodeStr)) {
                foundNodes.add(nodeStr);
                if (isPseudo(node)) {
                    pseudos.push(node);
                }
                else {
                    nodes.push(node);
                }
            }
        };
        this.nodes.forEach(filterNodes);
        other.nodes.forEach(filterNodes);
        pseudos.sort((a, b) => a.value.localeCompare(b.value));
        this.nodes = nodes.concat(pseudos);
        if (this.pseudoelement && other.pseudoelement && this.pseudoelement.value !== other.pseudoelement.value) {
            throw new Error("Cannot merge two compound selectors with different pseudoelements");
        }
        this.setPseudoelement(other.pseudoelement);
        return this;
    }
    /**
     * Remove the last `CompoundSelector` in this linked list.
     * @return The removed `CompoundSelector`, or undefined.
     */
    removeLast() {
        let selector = this;
        while (selector.next) {
            if (selector.next.selector.next === undefined) {
                let last = selector.next;
                selector.next = undefined;
                return last;
            }
            else Eif (selector.next) {
                selector = selector.next.selector;
            }
        }
        return undefined;
    }
    /**
     * Clone the `CompoundSelector` linked list starting at this node.
     * @return The cloned `CompoundSelector` linked list.
     */
    clone() {
        let firstCopy = new CompoundSelector();
        let copy = firstCopy;
        let current = this;
        do {
            copy.pseudoelement = current.pseudoelement;
            copy.nodes = current.nodes.slice();
            if (current.next) {
                copy.next = {
                    combinator: current.next.combinator,
                    selector: current.next.selector.clone(),
                };
            }
            copy = copy.next && copy.next.selector;
            current = current.next && current.next.selector;
        } while (copy && current);
        return firstCopy;
    }
    /**
     * Stringify this `CompoundSelector` list back into CSS.
     * @return The selector string.
     */
    toString(shallow = false) {
        let s = this.nodes.map(n => n.clone({ spaces: { before: "", after: "" } })).join("");
        if (this.pseudoelement) {
            s += this.pseudoelement.toString();
        }
        if (this.next && !shallow) {
            s += this.next.combinator.toString();
            s += this.next.selector.toString();
        }
        return s;
    }
}
exports.CompoundSelector = CompoundSelector;
/**
 * `ParsedSelector` serves as a container object for a `CompoundSelector` linked
 * list and provides a number of convenience methods for interacting with it.
 */
class ParsedSelector {
    /**
     * @param Root `CompoundSelector` of linked list to track.
     */
    constructor(selector, source) {
        this.selector = selector;
        this.source = source;
    }
    eachCompoundSelector(callback) {
        let selector = this.selector;
        Iif (!selector) {
            return;
        } // ex: `.foo, , .bar`
        let earlyReturn = callback(selector);
        while (earlyReturn === undefined && selector.next) {
            selector = selector.next.selector;
            earlyReturn = callback(selector);
        }
        return earlyReturn;
    }
    eachSelectorNode(callback) {
        return this.eachCompoundSelector((sel) => {
            for (let node of sel.nodes) {
                let earlyReturn = callback(node);
                Iif (earlyReturn !== undefined) {
                    return earlyReturn;
                }
                if (isContainer(node)) {
                    let earlyReturn;
                    try {
                        // walk doesn't have an early return mechanism so we have to create
                        // one with exception handling.
                        node.walk((n) => {
                            earlyReturn = callback(n);
                            if (earlyReturn !== undefined) {
                                throw earlyReturn;
                            }
                        });
                    }
                    catch (e) {
                        if (e === earlyReturn) {
                            return earlyReturn;
                        }
                        else {
                            throw e;
                        }
                    }
                }
            }
            return;
        });
    }
    /**
     * Checks if a given `CompoundSelector` is a context selector for this `ParsedSelector`.
     * @return True or false depending on if is context selector.
     */
    isContext(selector) {
        let k = this.selector;
        while (k.next !== undefined) {
            if (k === selector)
                return true;
            k = k.next.selector;
        }
        return false;
    }
    /**
     * Returns the key selector (last compound selector) of this selector.
     * @return Key selector.
     */
    get key() {
        if (this._key === undefined) {
            this._key = this.selector.lastSibling;
        }
        return this._key;
    }
    /**
     * Returns the number of `CompoundSelector` present in this `ParsedSelector`
     * @return CompoundSelector count.
     */
    get length() {
        let count = 0;
        let selector = this.selector;
        while (selector) {
            count++;
            selector = selector.next && selector.next.selector;
        }
        return count;
    }
    /**
     * Returns a deep clone of this `ParsedSelector` and the linked list it tracks.
     * @return new `ParsedSelector` clone.
     */
    clone() {
        return new ParsedSelector(this.selector.clone(), this.source);
    }
    /**
     * Stringify this `CompoundSelector` list back into CSS.
     * @return The selector string.
     */
    toString() {
        return this.selector.toString();
    }
    toContext(...keyNodes) {
        let context = this.clone();
        let key = context.key;
        key.nodes = key.nodes.filter(node => isPseudo(node)).sort((a, b) => a.value.localeCompare(b.value));
        if (keyNodes.length > 0) {
            key.nodes.unshift(...keyNodes);
        }
        else {
            key.nodes.unshift(postcssSelectorParser.universal());
        }
        return context;
    }
    /**
     * Same as toString() but having omitted the key selector.
     * Includes the final combinator prior to the key selector.
     */
    toContextString() {
        let context = "";
        let selector = this.selector;
        if (selector.next === undefined)
            return context;
        while (true) {
            context += selector.toString(true);
            Eif (selector.next) {
                let combinator = selector.next.combinator.value;
                context += combinator === " " ? combinator : ` ${combinator} `;
                selector = selector.next.selector;
                if (selector.next === undefined) {
                    // it's the key selector
                    break;
                }
            }
            else {
                break;
            }
        }
        return context;
    }
}
exports.ParsedSelector = ParsedSelector;
/**
 * Coerce a `selectorParser.Root` object to `selectorParser.Node[][]`.
 *
 * @param root  `selectorParser.Root` object
 * @return Array of `selectorParser.Node` arrays.
 */
function coerceRootToNodeList(root) {
    return root.nodes.map(n => n.nodes);
}
/**
 * Converts a selector like object to an array of `selectorParser.Node` arrays.
 *
 * @param selector  Selector like object: including `string`, `selectorParser.Root`, `selectorParser.Selector`, or `selectorParser.Node`
 * @return Array of `selectorParser.Node` arrays.
 */
function toNodes(selector) {
    // If input is already an array of Nodes, return.
    Iif (Array.isArray(selector)) {
        if (Array.isArray(selector[0])) {
            return selector;
        }
        else {
            return [selector];
        }
    }
    // If input is `selectorParser.Root`, coerce to proper output and return.
    if (isRoot(selector)) {
        return coerceRootToNodeList(selector);
    }
    Iif (isSelector(selector)) {
        // Otherwise, is a `selectorParser.Selector`. Unwrap nodes and return .
        return [selector.nodes];
    }
    let res = postcssSelectorParser().astSync(selector, { updateSelector: false });
    return coerceRootToNodeList(res);
}
/**
 * Converts a selector like object, return an array of `CompoundSelector` objects.
 *
 * @param selector  Selector like object: including `string`, `selectorParser.Root`, `selectorParser.Selector`, or `selectorParser.Node`
 * @return Array of `CompoundSelector` objects.
 */
function parseCompoundSelectors(selector) {
    let compoundSelectors = [];
    // For each selector in this rule, convert to a `CompoundSelector` linked list.
    toNodes(selector).forEach((nodes) => {
        let firstCompoundSel = new CompoundSelector();
        let compoundSel = firstCompoundSel;
        nodes.forEach((n) => {
            // If a combinator is encountered, start a new `CompoundSelector` and link to the previous.
            if (n.type === postcssSelectorParser.COMBINATOR) {
                let lastCompoundSel = compoundSel;
                compoundSel = new CompoundSelector();
                lastCompoundSel.setNext(n, compoundSel);
            }
            // Normalize :before and :after to always use double colons and save.
            else if (isPseudoElement(n)) {
                if (compoundSel.nodes.length === 0) {
                    let universal = postcssSelectorParser.universal();
                    n.parent.insertBefore(n, universal);
                    compoundSel.addNode(universal);
                }
                compoundSel.pseudoelement = n;
                if (!compoundSel.pseudoelement.value.startsWith("::")) {
                    compoundSel.pseudoelement.value = ":" + compoundSel.pseudoelement.value;
                }
            }
            // Otherwise add to compound selector.
            else {
                compoundSel.addNode(n);
            }
        });
        // Save in running list of compound selectors if not empty
        Eif (firstCompoundSel.nodes.length > 0) {
            compoundSelectors.push(firstCompoundSel);
        }
    });
    return compoundSelectors;
}
/**
 * Given a selector like object, return an array of `ParsedSelector` objects.
 * Passed `selector` may be any valid selector as a string, or `postcss-selector-parser`
 * object.
 *
 * @param selector  Selector like object: including `string`, `selectorParser.Root`, `selectorParser.Selector`, or `selectorParser.Node`
 * @return Array of `ParsedSelector` objects.
 */
function parseSelector(selector) {
    let source = undefined;
    if (typeof selector === "string") {
        let parsedSelectors = new Array();
        for (let source of selector.split(",")) {
            let compoundSelector = parseCompoundSelectors(source)[0];
            parsedSelectors.push(new ParsedSelector(compoundSelector, source));
        }
        return parsedSelectors;
    }
    else if (cssIntrospection_1.isRule(selector)) {
        let parsedSelectors = new Array();
        for (let source of selector.selectors) {
            let compoundSelector = parseCompoundSelectors(source)[0];
            parsedSelectors.push(new ParsedSelector(compoundSelector, source));
        }
        return parsedSelectors;
    }
    else Eif (isRoot(selector)) {
        source = selector.toString();
    }
    let compoundSelectors = parseCompoundSelectors(selector);
    return compoundSelectors.map(cs => new ParsedSelector(cs, source));
}
exports.parseSelector = parseSelector;
//# 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