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33 lines
686 B
33 lines
686 B
'use strict'; |
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/** |
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* Convert a string or array into a projection object, retaining all |
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* `-` and `+` paths. |
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*/ |
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module.exports = function parseProjection(v, retainMinusPaths) { |
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const type = typeof v; |
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if (type === 'string') { |
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v = v.split(/\s+/); |
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} |
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if (!Array.isArray(v) && Object.prototype.toString.call(v) !== '[object Arguments]') { |
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return v; |
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} |
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const len = v.length; |
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const ret = {}; |
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for (let i = 0; i < len; ++i) { |
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let field = v[i]; |
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if (!field) { |
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continue; |
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} |
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const include = '-' == field[0] ? 0 : 1; |
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if (!retainMinusPaths && include === 0) { |
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field = field.substring(1); |
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} |
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ret[field] = include; |
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} |
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return ret; |
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};
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