fabric/dist/src/parser/percent.mjs

Object model for HTML5 canvas, and SVG-to-canvas parser. Backed by jsdom and node-canvas.

import { ifNaN } from '../util/internals/ifNaN.mjs';
import { capValue } from '../util/misc/capValue.mjs';

/**
 * Will loosely accept as percent numbers that are not like
 * 3.4a%. This function does not check for the correctness of a percentage
 * but it checks that values that are in theory correct are or arent percentages
 */
function isPercent(value) {
  // /%$/ Matches strings that end with a percent sign (%)
  return value && /%$/.test(value) && Number.isFinite(parseFloat(value));
}

/**
 * Parse a percentage value in an svg.
 * @param value
 * @param fallback in case of not possible to parse the number
 * @returns ∈ [0, 1]
 */
function parsePercent(value, valueIfNaN) {
  const parsed = typeof value === 'number' ? value : typeof value === 'string' ? parseFloat(value) / (isPercent(value) ? 100 : 1) : NaN;
  return capValue(0, ifNaN(parsed, valueIfNaN), 1);
}

export { isPercent, parsePercent };
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