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'use strict'; // Based on https://www.w3.org/TR/SVG11/paths.html#PathDataBNF const argsCountPerCommand = { M: 2, m: 2, Z: 0, z: 0, L: 2, l: 2, H: 1, h: 1, V: 1, v: 1, C: 6, c: 6, S: 4, s: 4, Q: 4, q: 4, T: 2, t: 2, A: 7, a: 7, }; /** * @param {string} c */ const isCommand = (c) => { return c in argsCountPerCommand; }; /** * @param {string} c */ const isWsp = (c) => { const codePoint = c.codePointAt(0); return ( codePoint === 0x20 || codePoint === 0x9 || codePoint === 0xd || codePoint === 0xa ); }; /** * @param {string} c */ const isDigit = (c) => { const codePoint = c.codePointAt(0); if (codePoint == null) { return false; } return 48 <= codePoint && codePoint <= 57; }; /** * @typedef {'none' | 'sign' | 'whole' | 'decimal_point' | 'decimal' | 'e' | 'exponent_sign' | 'exponent'} ReadNumberState */ /** * @param {string} string * @param {number} cursor * @return {[number, number | null]} */ const readNumber = (string, cursor) => { let i = cursor; let value = ''; let state = /** @type {ReadNumberState} */ ('none'); for (; i < string.length; i += 1) { const c = string[i]; if (c === '+' || c === '-') { if (state === 'none') { state = 'sign'; value += c; continue; } if (state === 'e') { state = 'exponent_sign'; value += c; continue; } } if (isDigit(c)) { if (state === 'none' || state === 'sign' || state === 'whole') { state = 'whole'; value += c; continue; } if (state === 'decimal_point' || state === 'decimal') { state = 'decimal'; value += c; continue; } if (state === 'e' || state === 'exponent_sign' || state === 'exponent') { state = 'exponent'; value += c; continue; } } if (c === '.') { if (state === 'none' || state === 'sign' || state === 'whole') { state = 'decimal_point'; value += c; continue; } } if (c === 'E' || c == 'e') { if ( state === 'whole' || state === 'decimal_point' || state === 'decimal' ) { state = 'e'; value += c; continue; } } break; } const number = Number.parseFloat(value); if (Number.isNaN(number)) { return [cursor, null]; } else { // step back to delegate iteration to parent loop return [i - 1, number]; } }; /** * @param {string} string */ const parsePathData = (string) => { const pathData = []; let command = null; let args = /** @type {number[]} */ ([]); let argsCount = 0; let canHaveComma = false; let hadComma = false; for (let i = 0; i < string.length; i += 1) { const c = string.charAt(i); if (isWsp(c)) { continue; } // allow comma only between arguments if (canHaveComma && c === ',') { if (hadComma) { break; } hadComma = true; continue; } if (isCommand(c)) { if (hadComma) { return pathData; } if (command == null) { // moveto should be leading command if (c !== 'M' && c !== 'm') { return pathData; } } else { // stop if previous command arguments are not flushed if (args.length !== 0) { return pathData; } } command = c; args = []; argsCount = argsCountPerCommand[command]; canHaveComma = false; // flush command without arguments if (argsCount === 0) { pathData.push({ command, args }); } continue; } // avoid parsing arguments if no command detected if (command == null) { return pathData; } // read next argument let newCursor = i; let number = null; if (command === 'A' || command === 'a') { const position = args.length; if (position === 0 || position === 1) { // allow only positive number without sign as first two arguments if (c !== '+' && c !== '-') { [newCursor, number] = readNumber(string, i); } } if (position === 2 || position === 5 || position === 6) { [newCursor, number] = readNumber(string, i); } if (position === 3 || position === 4) { // read flags if (c === '0') { number = 0; } if (c === '1') { number = 1; } } } else { [newCursor, number] = readNumber(string, i); } if (number == null) { return pathData; } args.push(number); canHaveComma = true; hadComma = false; i = newCursor; // flush arguments when necessary count is reached if (args.length === argsCount) { pathData.push({ command, args }); // subsequent moveto coordinates are threated as implicit lineto commands if (command === 'M') { command = 'L'; } if (command === 'm') { command = 'l'; } args = []; } } return pathData; }; exports.parsePathData = parsePathData; /** * @typedef {{ * number: number; * precision?: number; * }} StringifyNumberOptions */ /** * @param {StringifyNumberOptions} param */ const stringifyNumber = ({ number, precision }) => { if (precision != null) { const ratio = 10 ** precision; number = Math.round(number * ratio) / ratio; } // remove zero whole from decimal number return number.toString().replace(/^0\./, '.').replace(/^-0\./, '-.'); }; /** * @typedef {{ * command: string; * args: number[]; * precision?: number; * disableSpaceAfterFlags?: boolean; * }} StringifyArgsOptions */ /** * * Elliptical arc large-arc and sweep flags are rendered with spaces * because many non-browser environments are not able to parse such paths * * @param {StringifyArgsOptions} param */ const stringifyArgs = ({ command, args, precision, disableSpaceAfterFlags, }) => { let result = ''; let prev = ''; for (let i = 0; i < args.length; i += 1) { const number = args[i]; const numberString = stringifyNumber({ number, precision }); if ( disableSpaceAfterFlags && (command === 'A' || command === 'a') && (i === 4 || i === 5) ) { result += numberString; } else if (i === 0 || numberString.startsWith('-')) { // avoid space before first and negative numbers result += numberString; } else if (prev.includes('.') && numberString.startsWith('.')) { // remove space before decimal with zero whole // only when previous number is also decimal result += numberString; } else { result += ` ${numberString}`; } prev = numberString; } return result; }; /** * * @typedef {{ * command: string; * args: number[]; * }} Command */ /** * @typedef {{ * pathData: Command[]; * precision?: number; * disableSpaceAfterFlags?: boolean; * }} StringifyPathDataOptions */ /** * @param {StringifyPathDataOptions} param */ const stringifyPathData = ({ pathData, precision, disableSpaceAfterFlags }) => { // combine sequence of the same commands let combined = []; for (let i = 0; i < pathData.length; i += 1) { const { command, args } = pathData[i]; if (i === 0) { combined.push({ command, args }); } else { const last = combined[combined.length - 1]; // match leading moveto with following lineto if (i === 1) { if (command === 'L') { last.command = 'M'; } if (command === 'l') { last.command = 'm'; } } if ( (last.command === command && last.command !== 'M' && last.command !== 'm') || // combine matching moveto and lineto sequences (last.command === 'M' && command === 'L') || (last.command === 'm' && command === 'l') ) { last.args = [...last.args, ...args]; } else { combined.push({ command, args }); } } } let result = ''; for (const { command, args } of combined) { result += command + stringifyArgs({ command, args, precision, disableSpaceAfterFlags }); } return result; }; exports.stringifyPathData = stringifyPathData;