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author | RaindropsSys <contact@minteck.org> | 2023-04-06 22:18:28 +0200 |
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committer | RaindropsSys <contact@minteck.org> | 2023-04-06 22:18:28 +0200 |
commit | 83354b2b88218090988dd6e526b0a2505b57e0f1 (patch) | |
tree | e3c73c38a122a78bb7e66fbb99056407edd9d4b9 /includes/external/addressbook/node_modules/nth-check/lib/esm/parse.js | |
parent | 47b8f2299a483024c4a6a8876af825a010954caa (diff) | |
download | pluralconnect-83354b2b88218090988dd6e526b0a2505b57e0f1.tar.gz pluralconnect-83354b2b88218090988dd6e526b0a2505b57e0f1.tar.bz2 pluralconnect-83354b2b88218090988dd6e526b0a2505b57e0f1.zip |
Updated 5 files and added 1110 files (automated)
Diffstat (limited to 'includes/external/addressbook/node_modules/nth-check/lib/esm/parse.js')
-rw-r--r-- | includes/external/addressbook/node_modules/nth-check/lib/esm/parse.js | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/includes/external/addressbook/node_modules/nth-check/lib/esm/parse.js b/includes/external/addressbook/node_modules/nth-check/lib/esm/parse.js new file mode 100644 index 0000000..96d1d48 --- /dev/null +++ b/includes/external/addressbook/node_modules/nth-check/lib/esm/parse.js @@ -0,0 +1,73 @@ +// Following http://www.w3.org/TR/css3-selectors/#nth-child-pseudo +// Whitespace as per https://www.w3.org/TR/selectors-3/#lex is " \t\r\n\f" +const whitespace = new Set([9, 10, 12, 13, 32]); +const ZERO = "0".charCodeAt(0); +const NINE = "9".charCodeAt(0); +/** + * Parses an expression. + * + * @throws An `Error` if parsing fails. + * @returns An array containing the integer step size and the integer offset of the nth rule. + * @example nthCheck.parse("2n+3"); // returns [2, 3] + */ +export function parse(formula) { + formula = formula.trim().toLowerCase(); + if (formula === "even") { + return [2, 0]; + } + else if (formula === "odd") { + return [2, 1]; + } + // Parse [ ['-'|'+']? INTEGER? {N} [ S* ['-'|'+'] S* INTEGER ]? + let idx = 0; + let a = 0; + let sign = readSign(); + let number = readNumber(); + if (idx < formula.length && formula.charAt(idx) === "n") { + idx++; + a = sign * (number !== null && number !== void 0 ? number : 1); + skipWhitespace(); + if (idx < formula.length) { + sign = readSign(); + skipWhitespace(); + number = readNumber(); + } + else { + sign = number = 0; + } + } + // Throw if there is anything else + if (number === null || idx < formula.length) { + throw new Error(`n-th rule couldn't be parsed ('${formula}')`); + } + return [a, sign * number]; + function readSign() { + if (formula.charAt(idx) === "-") { + idx++; + return -1; + } + if (formula.charAt(idx) === "+") { + idx++; + } + return 1; + } + function readNumber() { + const start = idx; + let value = 0; + while (idx < formula.length && + formula.charCodeAt(idx) >= ZERO && + formula.charCodeAt(idx) <= NINE) { + value = value * 10 + (formula.charCodeAt(idx) - ZERO); + idx++; + } + // Return `null` if we didn't read anything. + return idx === start ? null : value; + } + function skipWhitespace() { + while (idx < formula.length && + whitespace.has(formula.charCodeAt(idx))) { + idx++; + } + } +} +//# sourceMappingURL=parse.js.map
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