116 lines
3.6 KiB
JavaScript
116 lines
3.6 KiB
JavaScript
'use strict';
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var createNode = require('../doc/createNode.js');
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var stringifyCollection = require('../stringify/stringifyCollection.js');
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var Collection = require('./Collection.js');
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var identity = require('./identity.js');
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var Scalar = require('./Scalar.js');
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var toJS = require('./toJS.js');
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class YAMLSeq extends Collection.Collection {
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static get tagName() {
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return 'tag:yaml.org,2002:seq';
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}
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constructor(schema) {
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super(identity.SEQ, schema);
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this.items = [];
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}
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add(value) {
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this.items.push(value);
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}
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/**
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* Removes a value from the collection.
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*
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* `key` must contain a representation of an integer for this to succeed.
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* It may be wrapped in a `Scalar`.
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*
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* @returns `true` if the item was found and removed.
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*/
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delete(key) {
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const idx = asItemIndex(key);
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if (typeof idx !== 'number')
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return false;
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const del = this.items.splice(idx, 1);
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return del.length > 0;
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}
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get(key, keepScalar) {
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const idx = asItemIndex(key);
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if (typeof idx !== 'number')
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return undefined;
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const it = this.items[idx];
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return !keepScalar && identity.isScalar(it) ? it.value : it;
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}
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/**
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* Checks if the collection includes a value with the key `key`.
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*
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* `key` must contain a representation of an integer for this to succeed.
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* It may be wrapped in a `Scalar`.
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*/
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has(key) {
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const idx = asItemIndex(key);
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return typeof idx === 'number' && idx < this.items.length;
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}
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/**
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* Sets a value in this collection. For `!!set`, `value` needs to be a
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* boolean to add/remove the item from the set.
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*
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* If `key` does not contain a representation of an integer, this will throw.
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* It may be wrapped in a `Scalar`.
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*/
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set(key, value) {
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const idx = asItemIndex(key);
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if (typeof idx !== 'number')
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throw new Error(`Expected a valid index, not ${key}.`);
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const prev = this.items[idx];
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if (identity.isScalar(prev) && Scalar.isScalarValue(value))
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prev.value = value;
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else
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this.items[idx] = value;
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}
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toJSON(_, ctx) {
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const seq = [];
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if (ctx?.onCreate)
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ctx.onCreate(seq);
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let i = 0;
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for (const item of this.items)
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seq.push(toJS.toJS(item, String(i++), ctx));
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return seq;
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}
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toString(ctx, onComment, onChompKeep) {
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if (!ctx)
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return JSON.stringify(this);
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return stringifyCollection.stringifyCollection(this, ctx, {
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blockItemPrefix: '- ',
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flowChars: { start: '[', end: ']' },
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itemIndent: (ctx.indent || '') + ' ',
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onChompKeep,
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onComment
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});
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}
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static from(schema, obj, ctx) {
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const { replacer } = ctx;
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const seq = new this(schema);
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if (obj && Symbol.iterator in Object(obj)) {
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let i = 0;
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for (let it of obj) {
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if (typeof replacer === 'function') {
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const key = obj instanceof Set ? it : String(i++);
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it = replacer.call(obj, key, it);
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}
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seq.items.push(createNode.createNode(it, undefined, ctx));
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}
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}
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return seq;
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}
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}
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function asItemIndex(key) {
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let idx = identity.isScalar(key) ? key.value : key;
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if (idx && typeof idx === 'string')
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idx = Number(idx);
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return typeof idx === 'number' && Number.isInteger(idx) && idx >= 0
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? idx
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: null;
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}
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exports.YAMLSeq = YAMLSeq;
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