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54 lines
1.8 KiB
54 lines
1.8 KiB
let util = require("../../../../util");
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/**
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* Helper functions for components
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* @class
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*/
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class ComponentUtil {
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/**
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* Determine values to use for (sub)options of 'chosen'.
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*
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* This option is either a boolean or an object whose values should be examined further.
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* The relevant structures are:
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*
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* - chosen: <boolean value>
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* - chosen: { subOption: <boolean or function> }
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*
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* Where subOption is 'node', 'edge' or 'label'.
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*
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* The intention of this method appears to be to set a specific priority to the options;
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* Since most properties are either bridged or merged into the local options objects, there
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* is not much point in handling them separately.
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* TODO: examine if 'most' in previous sentence can be replaced with 'all'. In that case, we
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* should be able to get rid of this method.
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*
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* @param {string} subOption option within object 'chosen' to consider; either 'node', 'edge' or 'label'
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* @param {Object} pile array of options objects to consider
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*
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* @return {boolean|function} value for passed subOption of 'chosen' to use
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*/
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static choosify(subOption, pile) {
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// allowed values for subOption
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let allowed = [ 'node', 'edge', 'label'];
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let value = true;
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let chosen = util.topMost(pile, 'chosen');
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if (typeof chosen === 'boolean') {
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value = chosen;
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} else if (typeof chosen === 'object') {
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if (allowed.indexOf(subOption) === -1 ) {
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throw new Error('choosify: subOption \'' + subOption + '\' should be one of '
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+ "'" + allowed.join("', '") + "'");
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}
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let chosenEdge = util.topMost(pile, ['chosen', subOption]);
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if ((typeof chosenEdge === 'boolean') || (typeof chosenEdge === 'function')) {
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value = chosenEdge;
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}
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}
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return value;
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}
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}
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export default ComponentUtil;
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