| 1 | import { createEmptyMap, assign } from './map.js';
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| 2 | /**
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| 3 | * Create a new scope which can access the parent scope,
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| 4 | * but does not affect it when written. This is suitable for variable definitions
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| 5 | * within a block node, or function definition.
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| 6 | *
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| 7 | * If parent scope has a createSubScope method, it delegates to that. Otherwise,
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| 8 | * creates an empty map, and copies the parent scope to it, adding in
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| 9 | * the remaining `args`.
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| 10 | *
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| 11 | * @param {Map} parentScope
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| 12 | * @param {...any} args
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| 13 | * @returns {Map}
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| 14 | */
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| 15 |
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| 16 | export function createSubScope(parentScope) {
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| 17 | for (var _len = arguments.length, args = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
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| 18 | args[_key - 1] = arguments[_key];
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| 19 | }
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| 20 |
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| 21 | if (typeof parentScope.createSubScope === 'function') {
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| 22 | return assign(parentScope.createSubScope(), ...args);
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| 23 | }
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| 24 |
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| 25 | return assign(createEmptyMap(), parentScope, ...args);
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| 26 | } |
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