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node_modules/nth-check/lib/esm/compile.d.ts

@@ -0,0 +1,55 @@
+/**
+ * Returns a function that checks if an elements index matches the given rule
+ * highly optimized to return the fastest solution.
+ *
+ * @param parsed A tuple [a, b], as returned by `parse`.
+ * @returns A highly optimized function that returns whether an index matches the nth-check.
+ * @example
+ *
+ * ```js
+ * const check = nthCheck.compile([2, 3]);
+ *
+ * check(0); // `false`
+ * check(1); // `false`
+ * check(2); // `true`
+ * check(3); // `false`
+ * check(4); // `true`
+ * check(5); // `false`
+ * check(6); // `true`
+ * ```
+ */
+export declare function compile(parsed: [a: number, b: number]): (index: number) => boolean;
+/**
+ * Returns a function that produces a monotonously increasing sequence of indices.
+ *
+ * If the sequence has an end, the returned function will return `null` after
+ * the last index in the sequence.
+ *
+ * @param parsed A tuple [a, b], as returned by `parse`.
+ * @returns A function that produces a sequence of indices.
+ * @example <caption>Always increasing (2n+3)</caption>
+ *
+ * ```js
+ * const gen = nthCheck.generate([2, 3])
+ *
+ * gen() // `1`
+ * gen() // `3`
+ * gen() // `5`
+ * gen() // `8`
+ * gen() // `11`
+ * ```
+ *
+ * @example <caption>With end value (-2n+10)</caption>
+ *
+ * ```js
+ *
+ * const gen = nthCheck.generate([-2, 5]);
+ *
+ * gen() // 0
+ * gen() // 2
+ * gen() // 4
+ * gen() // null
+ * ```
+ */
+export declare function generate(parsed: [a: number, b: number]): () => number | null;
+//# sourceMappingURL=compile.d.ts.map

node_modules/nth-check/lib/esm/compile.d.ts.map

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node_modules/nth-check/lib/esm/compile.js

@@ -0,0 +1,113 @@
+import boolbase from "boolbase";
+/**
+ * Returns a function that checks if an elements index matches the given rule
+ * highly optimized to return the fastest solution.
+ *
+ * @param parsed A tuple [a, b], as returned by `parse`.
+ * @returns A highly optimized function that returns whether an index matches the nth-check.
+ * @example
+ *
+ * ```js
+ * const check = nthCheck.compile([2, 3]);
+ *
+ * check(0); // `false`
+ * check(1); // `false`
+ * check(2); // `true`
+ * check(3); // `false`
+ * check(4); // `true`
+ * check(5); // `false`
+ * check(6); // `true`
+ * ```
+ */
+export function compile(parsed) {
+    const a = parsed[0];
+    // Subtract 1 from `b`, to convert from one- to zero-indexed.
+    const b = parsed[1] - 1;
+    /*
+     * When `b <= 0`, `a * n` won't be lead to any matches for `a < 0`.
+     * Besides, the specification states that no elements are
+     * matched when `a` and `b` are 0.
+     *
+     * `b < 0` here as we subtracted 1 from `b` above.
+     */
+    if (b < 0 && a <= 0)
+        return boolbase.falseFunc;
+    // When `a` is in the range -1..1, it matches any element (so only `b` is checked).
+    if (a === -1)
+        return (index) => index <= b;
+    if (a === 0)
+        return (index) => index === b;
+    // When `b <= 0` and `a === 1`, they match any element.
+    if (a === 1)
+        return b < 0 ? boolbase.trueFunc : (index) => index >= b;
+    /*
+     * Otherwise, modulo can be used to check if there is a match.
+     *
+     * Modulo doesn't care about the sign, so let's use `a`s absolute value.
+     */
+    const absA = Math.abs(a);
+    // Get `b mod a`, + a if this is negative.
+    const bMod = ((b % absA) + absA) % absA;
+    return a > 1
+        ? (index) => index >= b && index % absA === bMod
+        : (index) => index <= b && index % absA === bMod;
+}
+/**
+ * Returns a function that produces a monotonously increasing sequence of indices.
+ *
+ * If the sequence has an end, the returned function will return `null` after
+ * the last index in the sequence.
+ *
+ * @param parsed A tuple [a, b], as returned by `parse`.
+ * @returns A function that produces a sequence of indices.
+ * @example <caption>Always increasing (2n+3)</caption>
+ *
+ * ```js
+ * const gen = nthCheck.generate([2, 3])
+ *
+ * gen() // `1`
+ * gen() // `3`
+ * gen() // `5`
+ * gen() // `8`
+ * gen() // `11`
+ * ```
+ *
+ * @example <caption>With end value (-2n+10)</caption>
+ *
+ * ```js
+ *
+ * const gen = nthCheck.generate([-2, 5]);
+ *
+ * gen() // 0
+ * gen() // 2
+ * gen() // 4
+ * gen() // null
+ * ```
+ */
+export function generate(parsed) {
+    const a = parsed[0];
+    // Subtract 1 from `b`, to convert from one- to zero-indexed.
+    let b = parsed[1] - 1;
+    let n = 0;
+    // Make sure to always return an increasing sequence
+    if (a < 0) {
+        const aPos = -a;
+        // Get `b mod a`
+        const minValue = ((b % aPos) + aPos) % aPos;
+        return () => {
+            const val = minValue + aPos * n++;
+            return val > b ? null : val;
+        };
+    }
+    if (a === 0)
+        return b < 0
+            ? // There are no result — always return `null`
+                () => null
+            : // Return `b` exactly once
+                () => (n++ === 0 ? b : null);
+    if (b < 0) {
+        b += a * Math.ceil(-b / a);
+    }
+    return () => a * n++ + b;
+}
+//# sourceMappingURL=compile.js.map

node_modules/nth-check/lib/esm/index.d.ts

@@ -0,0 +1,59 @@
+import { parse } from "./parse.js";
+import { compile, generate } from "./compile.js";
+export { parse, compile, generate };
+/**
+ * Parses and compiles a formula to a highly optimized function.
+ * Combination of {@link parse} and {@link compile}.
+ *
+ * If the formula doesn't match any elements,
+ * it returns [`boolbase`](https://github.com/fb55/boolbase)'s `falseFunc`.
+ * Otherwise, a function accepting an _index_ is returned, which returns
+ * whether or not the passed _index_ matches the formula.
+ *
+ * Note: The nth-rule starts counting at `1`, the returned function at `0`.
+ *
+ * @param formula The formula to compile.
+ * @example
+ * const check = nthCheck("2n+3");
+ *
+ * check(0); // `false`
+ * check(1); // `false`
+ * check(2); // `true`
+ * check(3); // `false`
+ * check(4); // `true`
+ * check(5); // `false`
+ * check(6); // `true`
+ */
+export default function nthCheck(formula: string): (index: number) => boolean;
+/**
+ * Parses and compiles a formula to a generator that produces a sequence of indices.
+ * Combination of {@link parse} and {@link generate}.
+ *
+ * @param formula The formula to compile.
+ * @returns A function that produces a sequence of indices.
+ * @example <caption>Always increasing</caption>
+ *
+ * ```js
+ * const gen = nthCheck.sequence('2n+3')
+ *
+ * gen() // `1`
+ * gen() // `3`
+ * gen() // `5`
+ * gen() // `8`
+ * gen() // `11`
+ * ```
+ *
+ * @example <caption>With end value</caption>
+ *
+ * ```js
+ *
+ * const gen = nthCheck.sequence('-2n+5');
+ *
+ * gen() // 0
+ * gen() // 2
+ * gen() // 4
+ * gen() // null
+ * ```
+ */
+export declare function sequence(formula: string): () => number | null;
+//# sourceMappingURL=index.d.ts.map

node_modules/nth-check/lib/esm/index.d.ts.map

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node_modules/nth-check/lib/esm/index.js

@@ -0,0 +1,63 @@
+import { parse } from "./parse.js";
+import { compile, generate } from "./compile.js";
+export { parse, compile, generate };
+/**
+ * Parses and compiles a formula to a highly optimized function.
+ * Combination of {@link parse} and {@link compile}.
+ *
+ * If the formula doesn't match any elements,
+ * it returns [`boolbase`](https://github.com/fb55/boolbase)'s `falseFunc`.
+ * Otherwise, a function accepting an _index_ is returned, which returns
+ * whether or not the passed _index_ matches the formula.
+ *
+ * Note: The nth-rule starts counting at `1`, the returned function at `0`.
+ *
+ * @param formula The formula to compile.
+ * @example
+ * const check = nthCheck("2n+3");
+ *
+ * check(0); // `false`
+ * check(1); // `false`
+ * check(2); // `true`
+ * check(3); // `false`
+ * check(4); // `true`
+ * check(5); // `false`
+ * check(6); // `true`
+ */
+export default function nthCheck(formula) {
+    return compile(parse(formula));
+}
+/**
+ * Parses and compiles a formula to a generator that produces a sequence of indices.
+ * Combination of {@link parse} and {@link generate}.
+ *
+ * @param formula The formula to compile.
+ * @returns A function that produces a sequence of indices.
+ * @example <caption>Always increasing</caption>
+ *
+ * ```js
+ * const gen = nthCheck.sequence('2n+3')
+ *
+ * gen() // `1`
+ * gen() // `3`
+ * gen() // `5`
+ * gen() // `8`
+ * gen() // `11`
+ * ```
+ *
+ * @example <caption>With end value</caption>
+ *
+ * ```js
+ *
+ * const gen = nthCheck.sequence('-2n+5');
+ *
+ * gen() // 0
+ * gen() // 2
+ * gen() // 4
+ * gen() // null
+ * ```
+ */
+export function sequence(formula) {
+    return generate(parse(formula));
+}
+//# sourceMappingURL=index.js.map

node_modules/nth-check/lib/esm/index.js.map

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node_modules/nth-check/lib/esm/package.json

@@ -0,0 +1 @@
+{"type":"module"}

node_modules/nth-check/lib/esm/parse.d.ts

@@ -0,0 +1,9 @@
+/**
+ * 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 declare function parse(formula: string): [a: number, b: number];
+//# sourceMappingURL=parse.d.ts.map

node_modules/nth-check/lib/esm/parse.d.ts.map

@@ -0,0 +1 @@
+{"version":3,"file":"parse.d.ts","sourceRoot":"https://raw.githubusercontent.com/fb55/nth-check/639fd2a4000b69f82350aad8c34cb43f77e483ba/src/","sources":["parse.ts"],"names":[],"mappings":"AAOA;;;;;;GAMG;AACH,wBAAgB,KAAK,CAAC,OAAO,EAAE,MAAM,GAAG,CAAC,CAAC,EAAE,MAAM,EAAE,CAAC,EAAE,MAAM,CAAC,CA6E7D"}

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