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Merge branch 'feature/LF-2100/supplementary-weight-function' into 'ma…
…ster' Added supplementary function weight() See merge request lfor/fhirpath.js!14
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,116 @@ | ||
| // Contains the supplementary FHIRPath functions defined in the Structured Data | ||
| // Capture IG, https://hl7.org/fhir/uv/sdc/expressions.html#fhirpath-supplements. | ||
|
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| let engine = {}; | ||
|
|
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| /** | ||
| * Returns numeric values from the score extension associated with the input | ||
| * collection of Questionnaire items. See the description of the ordinal() | ||
| * function here: | ||
| * https://hl7.org/fhir/uv/sdc/expressions.html#fhirpath-supplements | ||
| * @param {Array} coll - questionnaire items | ||
| * @return {number[]} | ||
| */ | ||
| engine.weight = function (coll) { | ||
| if(coll !== false && ! coll) { return []; } | ||
|
|
||
| const userScoreExtUrl = this.vars.scoreExt || this.processedVars.scoreExt; | ||
| const checkExtUrl = userScoreExtUrl | ||
| ? (e) => e.url === userScoreExtUrl | ||
| : (e) => this.defaultScoreExts.includes(e.url); | ||
| const res = []; | ||
|
|
||
| const questionnaire = this.vars.questionnaire || this.processedVars.questionnaire?.data; | ||
| coll.forEach((item) => { | ||
| if (item?.data) { | ||
| const valueCoding = item.data.valueCoding; | ||
| let value = valueCoding; | ||
| if (!value) { | ||
| const prop = Object.keys(item.data).find(p => p.length > 5 && p.startsWith('value')); | ||
| // if we found a child value[x] property | ||
| value = prop | ||
| // we use it to get a score extension | ||
| ? item.data[prop] | ||
| // otherwise, if the source item has a simple data type | ||
| : item._data?.extension | ||
| // we get the extension from the adjacent property starting with | ||
| // an underscore | ||
| ? item._data | ||
| // otherwise we get the extension from the source item | ||
| // (e.g. 'item' is a Coding) | ||
| : item.data; | ||
| } | ||
| const score = value?.extension?.find(checkExtUrl)?.valueDecimal; | ||
| if (score !== undefined) { | ||
| // if we have a score extension in the source item, use it. | ||
| res.push(score); | ||
| } else if (valueCoding) { | ||
| const linkIds = getLinkIds(item.parentResNode); | ||
| if (linkIds.length) { | ||
| if (questionnaire) { | ||
| const qItem = getQItemByLinkIds(questionnaire, linkIds); | ||
| const answerOption = qItem?.answerOption?.find(o => | ||
| o.valueCoding.code === valueCoding.code | ||
| && o.valueCoding.system === valueCoding.system | ||
| ); | ||
| if (answerOption) { | ||
| const score = answerOption.extension?.find(checkExtUrl)?.valueDecimal; | ||
| if (score !== undefined) { | ||
| // if we have a score extension for the answerOption, use it. | ||
| res.push(score); | ||
| } | ||
| } else { | ||
| throw new Error( | ||
| 'Questionnaire answerOption with this linkId was not found: ' + | ||
| item.parentResNode.data.linkId + '.'); | ||
| } | ||
| } else { | ||
| throw new Error('%questionnaire is needed but not specified.'); | ||
| } | ||
| } | ||
| } | ||
| } | ||
| }); | ||
|
|
||
| return res; | ||
| }; | ||
|
|
||
| /** | ||
| * Returns array of linkIds of ancestor ResourceNodes and source ResourceNode | ||
| * starting with the linkId of the given node and ending with the topmost item's | ||
| * linkId. | ||
| * @param {ResourceNode} node - source ResourceNode. | ||
| * @return {String[]} | ||
| */ | ||
| function getLinkIds(node) { | ||
| const res = []; | ||
|
|
||
| while (node.data?.linkId) { | ||
| res.push(node.data.linkId); | ||
| node = node.parentResNode; | ||
| } | ||
|
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| return res; | ||
| } | ||
|
|
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| /** | ||
| * Returns a questionnaire item based on the linkIds array of the ancestor | ||
| * ResourceNodes and the target ResourceNode. If the questionnaire item is not | ||
| * found, it returns null. | ||
| * @param {Object} questionnaire - object with a Questionnaire resource. | ||
| * @param {string[]} linkIds - array of linkIds starting with the linkId of the | ||
| * target node and ending with the topmost item's linkId. | ||
| * @return {Object | null} | ||
| */ | ||
| function getQItemByLinkIds(questionnaire, linkIds) { | ||
| let currentNode = questionnaire; | ||
| for(let i = linkIds.length-1; i >= 0; --i) { | ||
| currentNode = currentNode.item?.find(o => o.linkId === linkIds[i]); | ||
| if (!currentNode) { | ||
| return null; | ||
| } | ||
| } | ||
| return currentNode; | ||
| } | ||
|
|
||
| module.exports = engine; |
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