75b824d032
js2-mode is no longer developed and we recommend js-mode these days, so switch the modelines to specify that, and make them consistent across all files. https://bugzilla.gnome.org/show_bug.cgi?id=660358
35 lines
1.1 KiB
JavaScript
35 lines
1.1 KiB
JavaScript
// -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*-
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// parse:
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// @params: caller-provided parameter object, or %null
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// @defaults: function-provided defaults object
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// @allowExtras: whether or not to allow properties not in @default
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//
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// Examines @params and fills in default values from @defaults for
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// any properties in @defaults that don't appear in @params. If
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// @allowExtras is not %true, it will throw an error if @params
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// contains any properties that aren't in @defaults.
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//
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// If @params is %null, this returns the values from @defaults.
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//
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// Return value: a new object, containing the merged parameters from
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// @params and @defaults
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function parse(params, defaults, allowExtras) {
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let ret = {}, prop;
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if (!params)
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params = {};
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for (prop in params) {
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if (!(prop in defaults) && !allowExtras)
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throw new Error('Unrecognized parameter "' + prop + '"');
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ret[prop] = params[prop];
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}
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for (prop in defaults) {
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if (!(prop in params))
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ret[prop] = defaults[prop];
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}
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return ret;
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} |