48 lines
1.8 KiB
JavaScript
48 lines
1.8 KiB
JavaScript
const ALIAS = Symbol.for('yaml.alias');
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const DOC = Symbol.for('yaml.document');
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const MAP = Symbol.for('yaml.map');
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const PAIR = Symbol.for('yaml.pair');
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const SCALAR = Symbol.for('yaml.scalar');
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const SEQ = Symbol.for('yaml.seq');
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const NODE_TYPE = Symbol.for('yaml.node.type');
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const isAlias = (node) => !!node && typeof node === 'object' && node[NODE_TYPE] === ALIAS;
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const isDocument = (node) => !!node && typeof node === 'object' && node[NODE_TYPE] === DOC;
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const isMap = (node) => !!node && typeof node === 'object' && node[NODE_TYPE] === MAP;
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const isPair = (node) => !!node && typeof node === 'object' && node[NODE_TYPE] === PAIR;
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const isScalar = (node) => !!node && typeof node === 'object' && node[NODE_TYPE] === SCALAR;
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const isSeq = (node) => !!node && typeof node === 'object' && node[NODE_TYPE] === SEQ;
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function isCollection(node) {
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if (node && typeof node === 'object')
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switch (node[NODE_TYPE]) {
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case MAP:
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case SEQ:
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return true;
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}
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return false;
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}
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function isNode(node) {
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if (node && typeof node === 'object')
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switch (node[NODE_TYPE]) {
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case ALIAS:
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case MAP:
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case SCALAR:
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case SEQ:
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return true;
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}
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return false;
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}
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const hasAnchor = (node) => (isScalar(node) || isCollection(node)) && !!node.anchor;
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class NodeBase {
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constructor(type) {
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Object.defineProperty(this, NODE_TYPE, { value: type });
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}
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/** Create a copy of this node. */
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clone() {
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const copy = Object.create(Object.getPrototypeOf(this), Object.getOwnPropertyDescriptors(this));
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if (this.range)
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copy.range = this.range.slice();
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return copy;
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}
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}
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export { ALIAS, DOC, MAP, NODE_TYPE, NodeBase, PAIR, SCALAR, SEQ, hasAnchor, isAlias, isCollection, isDocument, isMap, isNode, isPair, isScalar, isSeq };
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