@masala/parser/src/lib/parsec/numbers-bundle.js

Masala Parser

/*
 * Masala Parser
 * https://github.com/masala/masala-parser
 *
 * Copyright (c) 2016-2025 Didier Plaindoux & Nicolas Zozol
 * Licensed under the LGPL3 license.
 */

import C from './chars-bundle.js'
import F from './flow-bundle.js'

// unit -> Parser number char
function number() {
    // [-+]?\d+([.]\d+)?([eE][+-]?\d+)?
    var join = (r) => r.join(''),
        joinOrEmpty = (r) => r.map(join).orElse(''),
        digits = digit().rep().map(join),
        integer = C.charIn('+-')
            .opt()
            .then(digits)
            .array()
            .map((r) => r[0].orElse('') + r[1]),
        float = integer
            .then(C.char('.').then(digits).opt().map(joinOrEmpty))
            .then(C.charIn('eE').then(integer).opt().map(joinOrEmpty))
            .array()
            .map((r) => r[0] + r[1] + r[2])

    return float.map((r) => parseFloat(r, 10))
}

// unit -> Parser char int
function digit() {
    return F.satisfy((v) => '0' <= v && v <= '9').map((c) => parseInt(c))
}

function digits() {
    return digit()
        .rep()
        .map((v) => parseInt(v.join('')))
}

function integer() {
    // [-+]?\d+
    var join = (r) => r.join(''),
        digits = digit().rep().map(join),
        integer = C.charIn('+-')
            .opt()
            .then(digits)
            .array()
            .map((r) => r[0].orElse('') + r[1])

    return integer.map((i) => parseInt(i, 10))
}

export default {
    number,
    digit,
    digits,
    integer,
}