All files / src/plugins prune.js

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import {toStr} from "../helpers/string/to_string"
import {clip} from "../helpers/number/clip"
import {toInt} from "../helpers/number/to_integer"
import { MAX_SAFE_INTEGER } from "../helpers/number/const"
import { REGEXP_EXTENDED_ASCII, REGEXP_LATIN_WORD, REGEXP_WORD } from "../helpers/regexp/regexp"
 
/*
* Truncates `subject` to a new `length` and does not break the words with specified ending.
* */
export const prune = (s, len = 0, end = "") => {
    let _s = toStr(s)
    let _len = !len ? _s.length : clip(toInt(len), 0, MAX_SAFE_INTEGER)
    let _truncatedLen = 0
    const pattern = REGEXP_EXTENDED_ASCII.test(_s) ? REGEXP_LATIN_WORD : REGEXP_WORD
 
    _s.replace(pattern, (word, offset) => {
        const wordLength = offset + word.length;
        if (wordLength <= _len - end.length) {
            _truncatedLen = wordLength;
        }
    });
 
    return _s.substr(0, _truncatedLen) + end;
}