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✏️ Editing: foldFlowLines.js

const FOLD_FLOW = 'flow';
const FOLD_BLOCK = 'block';
const FOLD_QUOTED = 'quoted';
/**
 * Tries to keep input at up to `lineWidth` characters, splitting only on spaces
 * not followed by newlines or spaces unless `mode` is `'quoted'`. Lines are
 * terminated with `\n` and started with `indent`.
 */
function foldFlowLines(text, indent, mode = 'flow', { indentAtStart, lineWidth = 80, minContentWidth = 20, onFold, onOverflow } = {}) {
    if (!lineWidth || lineWidth < 0)
        return text;
    if (lineWidth < minContentWidth)
        minContentWidth = 0;
    const endStep = Math.max(1 + minContentWidth, 1 + lineWidth - indent.length);
    if (text.length <= endStep)
        return text;
    const folds = [];
    const escapedFolds = {};
    let end = lineWidth - indent.length;
    if (typeof indentAtStart === 'number') {
        if (indentAtStart > lineWidth - Math.max(2, minContentWidth))
            folds.push(0);
        else
            end = lineWidth - indentAtStart;
    }
    let split = undefined;
    let prev = undefined;
    let overflow = false;
    let i = -1;
    let escStart = -1;
    let escEnd = -1;
    if (mode === FOLD_BLOCK) {
        i = consumeMoreIndentedLines(text, i, indent.length);
        if (i !== -1)
            end = i + endStep;
    }
    for (let ch; (ch = text[(i += 1)]);) {
        if (mode === FOLD_QUOTED && ch === '\\') {
            escStart = i;
            switch (text[i + 1]) {
                case 'x':
                    i += 3;
                    break;
                case 'u':
                    i += 5;
                    break;
                case 'U':
                    i += 9;
                    break;
                default:
                    i += 1;
            }
            escEnd = i;
        }
        if (ch === '\n') {
            if (mode === FOLD_BLOCK)
                i = consumeMoreIndentedLines(text, i, indent.length);
            end = i + indent.length + endStep;
            split = undefined;
        }
        else {
            if (ch === ' ' &&
                prev &&
                prev !== ' ' &&
                prev !== '\n' &&
                prev !== '\t') {
                // space surrounded by non-space can be replaced with newline + indent
                const next = text[i + 1];
                if (next && next !== ' ' && next !== '\n' && next !== '\t')
                    split = i;
            }
            if (i >= end) {
                if (split) {
                    folds.push(split);
                    end = split + endStep;
                    split = undefined;
                }
                else if (mode === FOLD_QUOTED) {
                    // white-space collected at end may stretch past lineWidth
                    while (prev === ' ' || prev === '\t') {
                        prev = ch;
                        ch = text[(i += 1)];
                        overflow = true;
                    }
                    // Account for newline escape, but don't break preceding escape
                    const j = i > escEnd + 1 ? i - 2 : escStart - 1;
                    // Bail out if lineWidth & minContentWidth are shorter than an escape string
                    if (escapedFolds[j])
                        return text;
                    folds.push(j);
                    escapedFolds[j] = true;
                    end = j + endStep;
                    split = undefined;
                }
                else {
                    overflow = true;
                }
            }
        }
        prev = ch;
    }
    if (overflow && onOverflow)
        onOverflow();
    if (folds.length === 0)
        return text;
    if (onFold)
        onFold();
    let res = text.slice(0, folds[0]);
    for (let i = 0; i < folds.length; ++i) {
        const fold = folds[i];
        const end = folds[i + 1] || text.length;
        if (fold === 0)
            res = `\n${indent}${text.slice(0, end)}`;
        else {
            if (mode === FOLD_QUOTED && escapedFolds[fold])
                res += `${text[fold]}\\`;
            res += `\n${indent}${text.slice(fold + 1, end)}`;
        }
    }
    return res;
}
/**
 * Presumes `i + 1` is at the start of a line
 * @returns index of last newline in more-indented block
 */
function consumeMoreIndentedLines(text, i, indent) {
    let end = i;
    let start = i + 1;
    let ch = text[start];
    while (ch === ' ' || ch === '\t') {
        if (i < start + indent) {
            ch = text[++i];
        }
        else {
            do {
                ch = text[++i];
            } while (ch && ch !== '\n');
            end = i;
            start = i + 1;
            ch = text[start];
        }
    }
    return end;
}

export { FOLD_BLOCK, FOLD_FLOW, FOLD_QUOTED, foldFlowLines };

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