Function getWordAtText

src/test/datascience/wordHelper.ts:125–152

(
    column: number,
    wordDefinition: RegExp,
    text: string,
    textOffset: number
)

}

export function getWordAtText(
    column: number,
    wordDefinition: RegExp,
    text: string,
    textOffset: number
): IWordAtPosition | null {
    // if `words` can contain whitespace character we have to use the slow variant
    // otherwise we use the fast variant of finding a word
    wordDefinition.lastIndex = 0;
    const match = wordDefinition.exec(text);
    if (!match) {
        return null;
    }
    // todo@joh the `match` could already be the (first) word
    const ret =
        match[0].indexOf(' ') >= 0
            ? // did match a word which contains a space character -> use slow word find
              getWordAtPosSlow(column, wordDefinition, text, textOffset)
            : // sane word definition -> use fast word find
              getWordAtPosFast(column, wordDefinition, text, textOffset);

    // both (getWordAtPosFast and getWordAtPosSlow) leave the wordDefinition-RegExp
    // in an undefined state and to not confuse other users of the wordDefinition
    // we reset the lastIndex
    wordDefinition.lastIndex = 0;

    return ret;
}

export function regExpLeadsToEndlessLoop(regexp: RegExp): boolean {
    // Exit early if it's one of these special cases which are meant to match