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Allow non-recursive select() with lambdas #8

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Allow non-recursive select() with lambdas #8

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eefe51e
Allow non-recursive select() with lambdas, by accepting additional ar…
datadiode Jul 10, 2024
f6f75f4
Demo on parsing MusicXML with pjXML using nested lambdas
datadiode Jul 12, 2024
e541248
Give select() with lambdas a choice between either doing a wild searc…
datadiode Jul 24, 2024
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21 changes: 15 additions & 6 deletions js/pjxml.js
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Original file line number Diff line number Diff line change
Expand Up @@ -398,19 +398,28 @@ var pjXML = (function () {
if (typeof xpath === 'function') {
const ar = [];

function safWorker(nd) {
if (xpath(nd)) {
function safWorker(nd, xpath, depth) {
const res = xpath(nd);

if (typeof res === 'function') {
xpath = res;
depth = 2;
} else if (res) {
ar.push(nd);
} else if (res === null) {
depth = 1;
}

const el = nd.elements();
if (--depth) {
const el = nd.elements();

for (let i = 0; i < el.length; i++) {
safWorker(el[i]);
for (let i = 0; i < el.length; i++) {
safWorker(el[i], xpath, depth);
}
}
}

safWorker(this);
safWorker(this, xpath, 0);

return ar;
}
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40 changes: 40 additions & 0 deletions nested-lambda-demo.html
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Original file line number Diff line number Diff line change
@@ -0,0 +1,40 @@
<!DOCTYPE html>

<script src='js/pjxml.js'></script>

<script>
function parsexml(text)
{
const doc = pjXML.parse(text);
const paragraphs = document.getElementsByTagName("p");
for (var i = 0; i < paragraphs.length; ++i)
{
const val = paragraphs[i].id;
const key = isNaN(val) ? "name" : "number";
paragraphs[i].innerText = doc.selectAll(
r => !(r.name == "score-partwise") ? false :
r => !(r.name == "part") ? false :
r => !(r.name == "measure") ? false :
r => !(r.name == "note") ? false :
r => !(r.name == "lyric" && r.attributes[key] == val) ? false :
r => r.name == "text").map(node => node.text()).join(" | ");
}
content.innerText = text;
}

function filechange()
{
const reader = new FileReader();
reader.addEventListener("load", () => parsexml(reader.result));
reader.readAsText(xml.files.item(0));
}
</script>

<h3>Demo on parsing MusicXML with pjXML using nested lambdas</h3>
<h4>Usage: Download <a href='https://lilypond.org/doc/v2.25/input/regression/musicxml/71/lily-1941d34e.xml'>lily-1941d34e.xml</a> and drop it into the below file input field.</h4>
<input type='file' id='xml' onchange='filechange()'>
<hr><p id='1'></p>
<hr><p id='2'></p>
<hr><p id='Verse'></p>
<hr><p id='Chorus'></p>
<hr><pre id='content'></pre>