editor = (doc) => {
const { EditorState, EditorView, EditorSelection, basicSetup } = cmBasic;
const { javascript } = cmJS;
const { keymap } = cmView;
const updateViewOf = EditorView.updateListener.of((update) => {
const { dom } = update.view;
dom.value = update;
dom.dispatchEvent(new CustomEvent("input"));
});
const view = new EditorView({
state: EditorState.create({
doc,
extensions: [
basicSetup,
javascript(),
updateViewOf,
cmView.keymap.of([
{
key: "F9",
run: expand
}
]),
cmView.keymap.of([
{
key: "ctrl-r",
run: expand
}
])
]
})
});
return view.dom;
}
expand = function (view) {
view.dispatch(
view.state.changeByRange((range) => {
const result = evaluate(view.state.sliceDoc(range.from, range.to));
// Evaluation errored, don’t do anything
if (result === false) return { range };
// How much longer is the new string?
const rangeLengthDif = result.length - (range.to - range.from);
return {
changes: {
from: range.from,
to: range.to,
insert: result
},
// The updated selection range
range: cmState.EditorSelection.range(
range.from,
range.to + rangeLengthDif
)
};
})
);
return true;
}
// Currently just manually passes in d3 and lodash (_) as fun things to use.
// I’d love to figure out how to pass in everything in scope at the cursor!!
evaluate = (expr) => {
try {
const result = new Function(...Object.keys(libs), `return ${expr}`)(
...Object.values(libs)
);
return typeof result === "object" ? JSON.stringify(result) : String(result);
} catch {
return false;
}
}
// Add anything you want F9 to be able to reference during evaluation;
// these are passed to the new Function constructed above.
libs = ({
d3,
_
})
cmView = skypack("@codemirror/next/view")
cmState = skypack("@codemirror/next/state")
cmBasic = skypack("@codemirror/next/basic-setup")
cmJS = skypack("@codemirror/next/lang-javascript")
skypack = (library) => import(`https://cdn.skypack.dev/${library}?min`)
// Nice formatting to display keyboard shortcuts
key = (keys) =>
html`${keys
.split(" ")
.map(
(key) => `<span style="
font-family: -apple-system, BlinkMacSystemFont, 'avenir next', avenir,
helvetica, 'helvetica neue', ubuntu, roboto, noto, 'segoe ui', arial,
sans-serif;
font-size: 14px;
font-weight: 500;
box-shadow: 0 0 0 1px #dedede, 1px 1px 0 1px #e8e8e8;
margin: 0 4px;
min-width: 6px;
padding-left: 4px;
padding-right: 4px;
text-align: center;
white-space: nowrap;
border-radius: .25rem;">${key}</span>`
)
.join("")}`
import { tweet } from "@mbostock/tweet"
One platform to build and deploy the best data apps
Experiment and prototype by building visualizations in live JavaScript notebooks. Collaborate with your team and decide which concepts to build out.
Use Observable Framework to build data apps locally. Use data loaders to build in any language or library, including Python, SQL, and R.
Seamlessly deploy to Observable. Test before you ship, use automatic deploy-on-commit, and ensure your projects are always up-to-date.