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Y: 1e24, Z: 1e21, E: 1e18, P: 1e15, T: 1e12,
G: 1e9, M: 1e6, k: 1e3,
m: 1e-3, u: 1e-6, µ: 1e-6, n: 1e-9, p: 1e-12,
f: 1e-15, a: 1e-18, z: 1e-21, y: 1e-24,
};
const NUMBER_WITH_UNIT_RE = /^([+-]?(?:\d+\.?\d*|\.\d+)(?:[eE][+-]?\d+)?)\s*(.*)?$/;
/**
* Parse a string like "1.5 nm" into { numeric: 1.5e-9, unit: "m" }.
* Returns null if the string does not start with a valid number.
* The numeric value is scaled to the base SI unit via the prefix.
*/
export function parseNumberWithUnit(text) {
const s = String(text ?? '').trim();
if (!s) return { numeric: 0, unit: '' };
const m = s.match(NUMBER_WITH_UNIT_RE);
if (!m) return null;
const numeric = parseFloat(m[1]);
const unitStr = (m[2] ?? '').trim();
if (!unitStr) return { numeric, unit: '' };
if (unitStr.length >= 2) {
const prefix = unitStr[0];
const rest = unitStr.slice(1);
const multiplier = SI_PREFIX_MULTIPLIERS[prefix];
if (multiplier !== undefined && PREFIXABLE_UNITS.has(rest)) {
return { numeric: numeric * multiplier, unit: rest };
}
}
return { numeric, unit: unitStr };
}
const SI_PREFIXES = [
{ exp: -24, prefix: 'y' },
{ exp: -21, prefix: 'z' },
{ exp: -18, prefix: 'a' },
{ exp: -15, prefix: 'f' },
{ exp: -12, prefix: 'p' },
{ exp: -9, prefix: 'n' },
{ exp: -6, prefix: 'u' },
{ exp: -3, prefix: 'm' },
{ exp: 0, prefix: '' },
{ exp: 3, prefix: 'k' },
{ exp: 6, prefix: 'M' },
{ exp: 9, prefix: 'G' },
{ exp: 12, prefix: 'T' },
{ exp: 15, prefix: 'P' },
{ exp: 18, prefix: 'E' },
{ exp: 21, prefix: 'Z' },
{ exp: 24, prefix: 'Y' },
];
const PREFIXABLE_UNITS = new Set([
'm', 's', 'A', 'V', 'W', 'Hz', 'F', 'C', 'J', 'N', 'Pa', 'T', 'H', 'S', 'g', 'K', 'Ohm', 'ohm', 'Ω',
]);
const SUPERSCRIPT_DIGITS = {
'-': '⁻',
'0': '⁰',
'1': '¹',
'2': '²',
'3': '³',
'4': '⁴',
'5': '⁵',
'6': '⁶',
'7': '⁷',
'8': '⁸',
'9': '⁹',
};
export function formatNumericCell(value) {
if (value == null) return '';
if (typeof value === 'number') {
if (!Number.isFinite(value)) return String(value);
const abs = Math.abs(value);
if (Number.isInteger(value) && abs < 1e6) return String(value);
if ((abs > 0 && abs < 1e-3) || abs >= 1e4) return value.toExponential(3);
return value.toFixed(4).replace(/\.?0+$/, '');
}
if (Array.isArray(value)) return value.join(', ');
return String(value);
}
function toSuperscript(text) {
return String(text)
.split('')
.map((char) => SUPERSCRIPT_DIGITS[char] || char)
.join('');
}
export function formatDisplayUnit(unit) {
return String(unit ?? '').replace(/\^(-?\d+)/g, (_, exponent) => toSuperscript(exponent));
}
function parsePrefixableUnit(unit) {
const text = String(unit ?? '').trim();
if (!text) return null;
const poweredMatch = text.match(/^([A-Za-zΩ]+)\^([1-9]\d*)$/);
if (poweredMatch) {
const [, baseUnit, powerText] = poweredMatch;
if (!PREFIXABLE_UNITS.has(baseUnit)) return null;
return { baseUnit, power: Number.parseInt(powerText, 10) };
}
if (!PREFIXABLE_UNITS.has(text)) return null;
return { baseUnit: text, power: 1 };
}
function formatPrefixedUnit(baseUnit, prefix, power) {
return power === 1 ? `${prefix}${baseUnit}` : `${prefix}${baseUnit}${toSuperscript(power)}`;
}
function choosePrefixExponent(value, power) {
const abs = Math.abs(value);
const candidates = SI_PREFIXES.map(({ exp, prefix }) => {
const scaled = value / (10 ** (exp * power));
return {
exp,
prefix,
scaled,
absScaled: Math.abs(scaled),
};
});
const inRange = candidates.filter(({ absScaled }) => absScaled >= 1 && absScaled < 999.5);
if (inRange.length > 0) {
return inRange.reduce((best, candidate) => (candidate.absScaled < best.absScaled ? candidate : best));
}
const aboveOne = candidates.filter(({ absScaled }) => absScaled >= 1);
if (aboveOne.length > 0) {
return aboveOne.reduce((best, candidate) => (candidate.absScaled < best.absScaled ? candidate : best));
}
return candidates.reduce((best, candidate) => (candidate.absScaled > best.absScaled ? candidate : best));
}
/**
* Given a representative axis value and a unit string, returns the scale factor
* and prefixed unit label to use for a whole axis.
* All tick values should be divided by `scale` before display, and `unitLabel` shown once.
*/
export function getAxisScale(representativeValue, unit) {
if (!unit || typeof representativeValue !== 'number' || !Number.isFinite(representativeValue) || representativeValue === 0) {
return { scale: 1, unitLabel: unit || '' };
}
const { valueText, unitText } = applySIPrefix(representativeValue, unit);
const scaled = parseFloat(valueText);
if (!Number.isFinite(scaled) || scaled === 0) return { scale: 1, unitLabel: unit };
return { scale: representativeValue / scaled, unitLabel: unitText };
}
export function applySIPrefix(value, unit) {
const formattedUnit = formatDisplayUnit(unit);
if (typeof value !== 'number' || !Number.isFinite(value)) {
return { valueText: formatNumericCell(value), unitText: formattedUnit };
}
if (value === 0) {
return { valueText: '0', unitText: formattedUnit };
}
const parsedUnit = parsePrefixableUnit(unit);
if (!parsedUnit) {
return { valueText: formatNumericCell(value), unitText: formattedUnit };
}
const chosenPrefix = choosePrefixExponent(value, parsedUnit.power);
return {
valueText: formatNumericCell(chosenPrefix.scaled),
unitText: formatPrefixedUnit(parsedUnit.baseUnit, chosenPrefix.prefix, parsedUnit.power),
};
}
function getCompanionUnitColumn(column, row) {
if (!row || typeof row !== 'object' || typeof column !== 'string' || column === 'unit') {
return null;
}
const unitColumn = `${column}_unit`;
return typeof row?.[unitColumn] === 'string' ? unitColumn : null;
}
export function getTableColumns(rows) {
const columns = [];
const hiddenColumns = new Set();
for (const row of rows || []) {
if (!row || typeof row !== 'object') continue;
for (const key of Object.keys(row)) {
if (
key.endsWith('_unit')
&& key.length > 5
&& Object.prototype.hasOwnProperty.call(row, key.slice(0, -5))
) {
hiddenColumns.add(key);
continue;
}
if (!columns.includes(key)) columns.push(key);
}
}
return columns.filter((column) => !hiddenColumns.has(column));
}
export function formatTableRowCell(row, column) {
const companionUnitColumn = getCompanionUnitColumn(column, row);
if (companionUnitColumn) {
const formatted = applySIPrefix(row?.[column], row?.[companionUnitColumn]);
return formatted.unitText ? `${formatted.valueText} ${formatted.unitText}` : formatted.valueText;
}
if (column === 'value' && typeof row?.unit === 'string') {
return applySIPrefix(row?.value, row.unit).valueText;
}
if (column === 'unit' && typeof row?.unit === 'string') {
return applySIPrefix(row?.value, row.unit).unitText;
}
return formatNumericCell(row?.[column]);
}
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