Tutorial02 extends the previous one by specifying a 2nd parameter to 'defineSentence', an object of type Evaluator. Evaluator is an interface with a single function evaluate(), which is called upon parsing the corresponding sentence.
For details, see also
<!doctype html>
<html>
<body>
<!-- The HTML element that will hold the editor -->
<div id="nls-container"></div>
<!-- The only javascript file needed for nlScript -->
<script src="https://cdn.jsdelivr.net/npm/@nlscript/nlscript@0.3.0/dist/umd/nlScript.js"></script>
<!-- Load the library for the actual processing -->
<script src="preprocessing.js"></script>
<script>
// Create an instance of the preprocessing backend.
let preprocessing = new Preprocessing("output");
let parser = new nlScript.Parser();
parser.defineSentence(
"Apply Gaussian blurring with a standard deviation of {stddev:float} pixel(s).",
// The function specified here will be called upon parsing the sentence above
pn => {
// The argument given to evaluate(), a ParsedNode, can be used to
// evaluate the value of the sentence's variables, here 'stddev'.
// They are accessed by name.
let stdDev = pn.evaluate("stddev");
// Do the ctual blurring, using the processing backend.
preprocessing.gaussianBlur(stdDev);
// Update the output image
preprocessing.show("output");
return undefined;
});
new nlScript.ACEditor(parser, document.getElementById("nls-container"));
</script>
</body>
</html>
