@angular/language-service/src/binding_utils.js

/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
(function (factory) {
    if (typeof module === "object" && typeof module.exports === "object") {
        var v = factory(require, exports);
        if (v !== undefined) module.exports = v;
    }
    else if (typeof define === "function" && define.amd) {
        define("@angular/language-service/src/binding_utils", ["require", "exports"], factory);
    }
})(function (require, exports) {
    "use strict";
    Object.defineProperty(exports, "__esModule", { value: true });
    exports.getBindingDescriptor = exports.ATTR = void 0;
    /**
     * Matches an Angular attribute to a binding type. See `ATTR` for more details.
     *
     * This is adapted from packages/compiler/src/render3/r3_template_transform.ts
     * to allow empty binding names and match template attributes.
     */
    var BIND_NAME_REGEXP = /^(?:(?:(?:(bind-)|(let-)|(ref-|#)|(on-)|(bindon-)|(@)|(\*))(.*))|\[\(([^\)]*)\)\]|\[([^\]]*)\]|\(([^\)]*)\))$/;
    /**
     * Represents possible Angular attribute bindings, as indices on a match of `BIND_NAME_REGEXP`.
     */
    var ATTR;
    (function (ATTR) {
        /** "bind-" */
        ATTR[ATTR["KW_BIND"] = 1] = "KW_BIND";
        /** "let-" */
        ATTR[ATTR["KW_LET"] = 2] = "KW_LET";
        /** "ref-/#" */
        ATTR[ATTR["KW_REF"] = 3] = "KW_REF";
        /** "on-" */
        ATTR[ATTR["KW_ON"] = 4] = "KW_ON";
        /** "bindon-" */
        ATTR[ATTR["KW_BINDON"] = 5] = "KW_BINDON";
        /** "@" */
        ATTR[ATTR["KW_AT"] = 6] = "KW_AT";
        /**
         * "*"
         * Microsyntax template starts with '*'. See https://angular.io/api/core/TemplateRef
         */
        ATTR[ATTR["KW_MICROSYNTAX"] = 7] = "KW_MICROSYNTAX";
        /** The identifier after "bind-", "let-", "ref-/#", "on-", "bindon-", "@", or "*" */
        ATTR[ATTR["IDENT_KW"] = 8] = "IDENT_KW";
        /** Identifier inside [()] */
        ATTR[ATTR["IDENT_BANANA_BOX"] = 9] = "IDENT_BANANA_BOX";
        /** Identifier inside [] */
        ATTR[ATTR["IDENT_PROPERTY"] = 10] = "IDENT_PROPERTY";
        /** Identifier inside () */
        ATTR[ATTR["IDENT_EVENT"] = 11] = "IDENT_EVENT";
    })(ATTR = exports.ATTR || (exports.ATTR = {}));
    /**
     * Returns a descriptor for a given Angular attribute, or undefined if the attribute is
     * not an Angular attribute.
     */
    function getBindingDescriptor(attribute) {
        var bindParts = attribute.match(BIND_NAME_REGEXP);
        if (!bindParts)
            return;
        // The first match element is skipped because it matches the entire attribute text, including the
        // binding part.
        var kind = bindParts.findIndex(function (val, i) { return i > 0 && val !== undefined; });
        if (!(kind in ATTR)) {
            throw TypeError("\"" + kind + "\" is not a valid Angular binding kind for \"" + attribute + "\"");
        }
        return {
            kind: kind,
            name: bindParts[ATTR.IDENT_KW],
        };
    }
    exports.getBindingDescriptor = getBindingDescriptor;
});
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