igv_component/node_modules/apache-arrow/row/map.mjs

// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.
import { Vector } from '../vector.mjs';
import { valueToString } from '../util/pretty.mjs';
import { instance as getVisitor } from '../visitor/get.mjs';
import { instance as setVisitor } from '../visitor/set.mjs';
/** @ignore */ export const kKeys = Symbol.for('keys');
/** @ignore */ export const kVals = Symbol.for('vals');
export class MapRow {
    constructor(slice) {
        this[kKeys] = new Vector([slice.children[0]]).memoize();
        this[kVals] = slice.children[1];
        return new Proxy(this, new MapRowProxyHandler());
    }
    [Symbol.iterator]() {
        return new MapRowIterator(this[kKeys], this[kVals]);
    }
    get size() { return this[kKeys].length; }
    toArray() { return Object.values(this.toJSON()); }
    toJSON() {
        const keys = this[kKeys];
        const vals = this[kVals];
        const json = {};
        for (let i = -1, n = keys.length; ++i < n;) {
            json[keys.get(i)] = getVisitor.visit(vals, i);
        }
        return json;
    }
    toString() {
        return `{${[...this].map(([key, val]) => `${valueToString(key)}: ${valueToString(val)}`).join(', ')}}`;
    }
    [Symbol.for('nodejs.util.inspect.custom')]() {
        return this.toString();
    }
}
class MapRowIterator {
    constructor(keys, vals) {
        this.keys = keys;
        this.vals = vals;
        this.keyIndex = 0;
        this.numKeys = keys.length;
    }
    [Symbol.iterator]() { return this; }
    next() {
        const i = this.keyIndex;
        if (i === this.numKeys) {
            return { done: true, value: null };
        }
        this.keyIndex++;
        return {
            done: false,
            value: [
                this.keys.get(i),
                getVisitor.visit(this.vals, i),
            ]
        };
    }
}
/** @ignore */
class MapRowProxyHandler {
    isExtensible() { return false; }
    deleteProperty() { return false; }
    preventExtensions() { return true; }
    ownKeys(row) {
        return row[kKeys].toArray().map(String);
    }
    has(row, key) {
        return row[kKeys].includes(key);
    }
    getOwnPropertyDescriptor(row, key) {
        const idx = row[kKeys].indexOf(key);
        if (idx !== -1) {
            return { writable: true, enumerable: true, configurable: true };
        }
        return;
    }
    get(row, key) {
        // Look up key in row first
        if (Reflect.has(row, key)) {
            return row[key];
        }
        const idx = row[kKeys].indexOf(key);
        if (idx !== -1) {
            const val = getVisitor.visit(Reflect.get(row, kVals), idx);
            // Cache key/val lookups
            Reflect.set(row, key, val);
            return val;
        }
    }
    set(row, key, val) {
        const idx = row[kKeys].indexOf(key);
        if (idx !== -1) {
            setVisitor.visit(Reflect.get(row, kVals), idx, val);
            // Cache key/val lookups
            return Reflect.set(row, key, val);
        }
        else if (Reflect.has(row, key)) {
            return Reflect.set(row, key, val);
        }
        return false;
    }
}
Object.defineProperties(MapRow.prototype, {
    [Symbol.toStringTag]: { enumerable: false, configurable: false, value: 'Row' },
    [kKeys]: { writable: true, enumerable: false, configurable: false, value: null },
    [kVals]: { writable: true, enumerable: false, configurable: false, value: null },
});

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