locutus/esm/python/_helpers/_bisect.js

Locutus other languages' standard libraries to JavaScript for fun and educational purposes

import { isNumericLike, toPythonInteger, toPythonNumber } from "./_operator.js";
export function pythonBisect(sequence, item, lo, hi) {
    return bisectCore(sequence, item, lo, hi, 'bisect', 'right');
}
export function pythonBisectLeft(sequence, item, lo, hi) {
    return bisectCore(sequence, item, lo, hi, 'bisect_left', 'left');
}
export function pythonBisectRight(sequence, item, lo, hi) {
    return bisectCore(sequence, item, lo, hi, 'bisect_right', 'right');
}
function bisectCore(sequence, item, lo, hi, functionName, side) {
    const values = toBisectSequence(sequence, functionName);
    let left = normalizeLo(lo, functionName);
    let right = normalizeHi(hi, values.length, functionName);
    while (left < right) {
        const middle = Math.floor((left + right) / 2);
        const candidate = getSequenceItem(values, middle);
        if (side === 'left' ? pythonLessThan(candidate, item, functionName) : !pythonLessThan(item, candidate, functionName)) {
            left = middle + 1;
        }
        else {
            right = middle;
        }
    }
    return left;
}
function toBisectSequence(sequence, functionName) {
    if (Array.isArray(sequence) || typeof sequence === 'string') {
        return sequence;
    }
    throw new TypeError(`${functionName}() expected an indexable sequence`);
}
function normalizeLo(value, functionName) {
    if (value === undefined) {
        return 0;
    }
    const index = toSequenceIndex(value, functionName);
    if (index < 0) {
        throw new RangeError('lo must be non-negative');
    }
    return index;
}
function normalizeHi(value, sequenceLength, functionName) {
    if (value === undefined || value === null) {
        return sequenceLength;
    }
    return toSequenceIndex(value, functionName);
}
function toSequenceIndex(value, functionName) {
    const index = Number(toPythonInteger(value, functionName));
    if (!Number.isSafeInteger(index)) {
        throw new RangeError(`${functionName}() index must fit within JS safe integer precision`);
    }
    return index;
}
function getSequenceItem(sequence, index) {
    if (index < 0 || index >= sequence.length) {
        throw new Error(Array.isArray(sequence) ? 'list index out of range' : 'string index out of range');
    }
    return sequence[index];
}
function pythonLessThan(left, right, functionName) {
    if (isNumericLike(left) && isNumericLike(right)) {
        const leftNumber = toPythonNumber(left, functionName);
        const rightNumber = toPythonNumber(right, functionName);
        if (Number.isNaN(leftNumber) || Number.isNaN(rightNumber)) {
            return false;
        }
        return leftNumber < rightNumber;
    }
    if (typeof left === 'string' && typeof right === 'string') {
        return left < right;
    }
    throw new TypeError(`'<' not supported between instances of '${pythonTypeName(left)}' and '${pythonTypeName(right)}'`);
}
function pythonTypeName(value) {
    if (typeof value === 'string') {
        return 'str';
    }
    if (typeof value === 'boolean') {
        return 'bool';
    }
    if (typeof value === 'bigint' || typeof value === 'number') {
        return 'int';
    }
    if (Array.isArray(value)) {
        return 'list';
    }
    if (value === null) {
        return 'NoneType';
    }
    if (value === undefined) {
        return 'undefined';
    }
    return typeof value;
}