https://github.com/jmandel/fhirpath.js

FHIR Path implementation in JavaScript
https://github.com/jmandel/fhirpath.js

Last synced: 19 days ago
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FHIR Path implementation in JavaScript

• Host: GitHub
• URL: https://github.com/jmandel/fhirpath.js
• Owner: jmandel
• Created: 2015-11-19T09:44:21.000Z (almost 9 years ago)
• Default Branch: master
• Last Pushed: 2015-11-21T01:09:57.000Z (almost 9 years ago)
• Last Synced: 2024-10-06T15:43:06.121Z (about 1 month ago)
• Language: JavaScript
• Homepage:
• Size: 183 KB
• Stars: 14
• Watchers: 2
• Forks: 11
• Open Issues: 1
• Metadata Files:
  • Readme: README.md

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README

        
## fhirpath.js

To use it, `npm install fhirpath.js`. Then:

```js

   var fp = require('fhirpath.js')

   var result = fp.evaluate({      // the target to evaluate against

     "a": 1,

     "b": [2, 3]

   }, "a | b | a")                    // the path expression to evaluate

   assert.deepEqual(result, [1, 2, 3, 1])

```

To add you own custom constants to the lookup table, pass along a third argument like:

```js

   var result = fp.evaluate({      // the target to evaluate against

     "a": "some great value",

     "b": [2, 3]

   }, "a=%my-constant", {

     "my-constant": "some great value"

   })

   

   assert.deepEqual(result, [true])

```

If passing a lookup table with every call gets tedious, you can create a new execution context with the table baked in:

```js

   var myfp = fp.withConstants({"my-constant": "some great value"})

   

   var result = myfp.evaluate({      // the target to evaluate against

     "a": "some great value",

     "b": [2, 3]

   }, "a=%my-constant")

   

   assert.deepEqual(result, [true])

```

## Try it

Live demo at https://niquola.github.io/fhirpath-demo/#/

## Develop it

Generate the lexer and parser from the included Antlr grammer via:

    sh ./setup.sh

Run tests:

    npm  test

Regenerate test case file:

    npm run-script generate-test-cases