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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 = splitIntoWords(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 splitIntoWords = (str) => {
// Split at word boundaries
const regex = /\b/
const triggers = /[@#:]+$/
let split = str.split(regex)
// Add trailing @ and # to the following word.
const words = reduce(split, (result, word) => {
if (result.length > 0) {
let previous = result.pop()
const matches = previous.match(triggers)
if (matches) {
previous = previous.replace(triggers, '')
word = matches[0] + word
}
result.push(previous)
}
result.push(word)
return result
}, [])
return words
}
const completion = {
wordAtPosition,
addPositionToWords,
splitIntoWords,
replaceWord
}
export default completion
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