Crossword / Take 5 cheat

crossword-cheat.js

const readline = require('readline')
const fs = require('fs')

const lineReader = readline.createInterface({
    input: fs.createReadStream('/usr/share/dict/words', { encoding: 'utf8' })
})

const word = process.argv[2]

if (!word) {
    console.log('Please give a word or pattern to check')
    return
}

function allSame (xs) {

    for (let i = 1; i < xs.length; i++) {
        if (xs[i] !== xs[0]) { return false }
    }

    return true
}

function isCompletion (str, target) {

    if (str.length !== target.length) { return false } // if not same length, can't be a match

    const bound = {}

    // Check each letter
    for (let i = 0; i < str.length; i++) {

        let c = str[i]
        let c2 = target[i]

        if (isNaN(c)) { // Is a letter or *
            if (c === c2 || c === '*') { // Matches exactly or wildcard
                continue 
            } else {
                return false
            }
        } else { // Bind the number to the character
            if (!bound[c]) {
                bound[c] = [target[i]]
            } else {
                bound[c].push(target[i])
            }
        }
    }

    // Ensure all chars at each binding are the same
    for (let b in bound) {
        if (!allSame(bound[b])) {
            return false 
        }
    }

    return true
} 

// Possible Words

// apple == apple
// ***** == apple
// a**** == apple
// a1123 == apple
// a1234 != apple

function test () {
    console.log([
        isCompletion('eat', 'eat'),
        isCompletion('***', 'eat'),
        isCompletion('**', 'eat') === false,
        isCompletion('****', 'eat') === false,
        isCompletion('123', 'eat'),
        isCompletion('122', 'too'),
        isCompletion('e23', 'eat'),
        isCompletion('111', 'eat') === false
    ])
}

lineReader.on('line', line => {
    if (isCompletion(word, line.toLowerCase().trim())) {
        console.log(line)
    }
})