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import { reduce, find } from 'lodash'
export const replaceWord = (str, toReplace, replacement) => {
return str.slice(0, toReplace.start) + replacement + str.slice(toReplace.end)
}
export const wordAtPosition = (str, pos) => {
const words = splitByWhitespaceBoundary(str)
const wordsWithPosition = addPositionToWords(words)
return find(wordsWithPosition, ({ start, end }) => start <= pos && end > pos)
}
export const addPositionToWords = (words) => {
return reduce(words, (result, word) => {
const data = {
word,
start: 0,
end: word.length
}
if (result.length > 0) {
const previous = result.pop()
data.start += previous.end
data.end += previous.end
result.push(previous)
}
result.push(data)
return result
}, [])
}
export const splitByWhitespaceBoundary = (str) => {
let result = []
let currentWord = ''
for (let i = 0; i < str.length; i++) {
const currentChar = str[i]
// Starting a new word
if (!currentWord) {
currentWord = currentChar
continue
}
// current character is whitespace while word isn't, or vice versa:
// add our current word to results, start over the current word.
if (!!currentChar.trim() !== !!currentWord.trim()) {
result.push(currentWord)
currentWord = currentChar
continue
}
currentWord += currentChar
}
// Add the last word we were working on
if (currentWord) {
result.push(currentWord)
}
return result
}
const completion = {
wordAtPosition,
addPositionToWords,
splitByWhitespaceBoundary,
replaceWord
}
export default completion
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