Visualization toolmaker. Founder @observablehq. Creator @d3. Former @nytgraphics. Pronounced BOSS-tock.
Published
Edited
Feb 2, 2021
2 forks
Importers
65 stars
cstParseRows(source)
cstParseRows(source, ([name, value, color = "#ddd"]) => ({
name,
value: value === undefined ? undefined : +value,
color
}))
cstParse(sourceWithHeader)
function cstParse(text, row = object => object) {
const lines = text.trim().split(/^/gm);
const [columns] = d3.csvParseRows(lines.shift());
const object = objectConverter(columns);
return cstParseLines(lines, (array, i) => row(object(array), i));
}
function cstParseRows(text, row = array => array) {
return cstParseLines(text.trim().split(/^/gm), row);
}
function cstParseLines(lines, row) {
const parents = [];
let index = -1;
parents.push({children: []});
for (let line of lines) {
const depth = line.match(/^\s*/)[0].length;
if (depth === line.length) continue; // Skip empty rows.
line = line.slice(depth); // Trim indentation.
const value = row(d3.csvParseRows(line)[0], ++index);
if (value == null) continue; // Filter.
let parent;
for (let i = depth; !(parent = parents[i]); --i); // Search for parent.
if (!parent.children) parent.children = [];
parent.children.push(parents[depth + 1] = value);
}
return parents[0].children.length === 1 ? parents[0].children[0] : parents[0];
}
function objectConverter(columns) {
return new Function("d", `return {${columns.map((name, i) => {
return `${JSON.stringify(name)}: d[${i}]`;
}).join()}}`);
}
function editor(value) {
const textarea = document.createElement("textarea");
textarea.value = value;
textarea.style.display = "block";
textarea.style.boxSizing = "border-box";
textarea.style.width = "calc(100% + 28px)";
textarea.style.font = "var(--monospace-font, var(--mono_fonts))";
textarea.style.minHeight = "60px";
textarea.style.border = "none";
textarea.style.padding = "4px 10px";
textarea.style.margin = "0 -14px";
textarea.style.background = "rgb(247,247,249)";
textarea.style.tabSize = 2;
textarea.style.resize = "none";
textarea.onkeypress = event => {
if (event.key !== "Enter" || event.shiftKey || event.altKey || event.metaKey || event.ctrlKey) return;
let i = textarea.selectionStart;
let j = textarea.selectionEnd;
let v = textarea.value;
if (i === j) {
let k = 0;
while (i > 0 && v[--i - 1] !== "\n");
while (i < j && v[i] === " ") ++i, ++k;
textarea.value = v.substring(0, j) + "\n" + new Array(k + 1).join(" ") + v.substring(j);
textarea.selectionStart = textarea.selectionEnd = j + k + 1;
textarea.dispatchEvent(new CustomEvent("input"));
event.preventDefault();
}
};
textarea.oninput = () => textarea.style.height = `${textarea.value.match(/^/gm).length * 21 + 8}px`;
textarea.oninput();
return textarea;
}
d3 = require("d3-dsv@1")
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