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✏️ Editing: resolve-block-scalar.js

'use strict';

var Scalar = require('../nodes/Scalar.js');

function resolveBlockScalar(ctx, scalar, onError) {
    const start = scalar.offset;
    const header = parseBlockScalarHeader(scalar, ctx.options.strict, onError);
    if (!header)
        return { value: '', type: null, comment: '', range: [start, start, start] };
    const type = header.mode === '>' ? Scalar.Scalar.BLOCK_FOLDED : Scalar.Scalar.BLOCK_LITERAL;
    const lines = scalar.source ? splitLines(scalar.source) : [];
    // determine the end of content & start of chomping
    let chompStart = lines.length;
    for (let i = lines.length - 1; i >= 0; --i) {
        const content = lines[i][1];
        if (content === '' || content === '\r')
            chompStart = i;
        else
            break;
    }
    // shortcut for empty contents
    if (chompStart === 0) {
        const value = header.chomp === '+' && lines.length > 0
            ? '\n'.repeat(Math.max(1, lines.length - 1))
            : '';
        let end = start + header.length;
        if (scalar.source)
            end += scalar.source.length;
        return { value, type, comment: header.comment, range: [start, end, end] };
    }
    // find the indentation level to trim from start
    let trimIndent = scalar.indent + header.indent;
    let offset = scalar.offset + header.length;
    let contentStart = 0;
    for (let i = 0; i < chompStart; ++i) {
        const [indent, content] = lines[i];
        if (content === '' || content === '\r') {
            if (header.indent === 0 && indent.length > trimIndent)
                trimIndent = indent.length;
        }
        else {
            if (indent.length < trimIndent) {
                const message = 'Block scalars with more-indented leading empty lines must use an explicit indentation indicator';
                onError(offset + indent.length, 'MISSING_CHAR', message);
            }
            if (header.indent === 0)
                trimIndent = indent.length;
            contentStart = i;
            if (trimIndent === 0 && !ctx.atRoot) {
                const message = 'Block scalar values in collections must be indented';
                onError(offset, 'BAD_INDENT', message);
            }
            break;
        }
        offset += indent.length + content.length + 1;
    }
    // include trailing more-indented empty lines in content
    for (let i = lines.length - 1; i >= chompStart; --i) {
        if (lines[i][0].length > trimIndent)
            chompStart = i + 1;
    }
    let value = '';
    let sep = '';
    let prevMoreIndented = false;
    // leading whitespace is kept intact
    for (let i = 0; i < contentStart; ++i)
        value += lines[i][0].slice(trimIndent) + '\n';
    for (let i = contentStart; i < chompStart; ++i) {
        let [indent, content] = lines[i];
        offset += indent.length + content.length + 1;
        const crlf = content[content.length - 1] === '\r';
        if (crlf)
            content = content.slice(0, -1);
        /* istanbul ignore if already caught in lexer */
        if (content && indent.length < trimIndent) {
            const src = header.indent
                ? 'explicit indentation indicator'
                : 'first line';
            const message = `Block scalar lines must not be less indented than their ${src}`;
            onError(offset - content.length - (crlf ? 2 : 1), 'BAD_INDENT', message);
            indent = '';
        }
        if (type === Scalar.Scalar.BLOCK_LITERAL) {
            value += sep + indent.slice(trimIndent) + content;
            sep = '\n';
        }
        else if (indent.length > trimIndent || content[0] === '\t') {
            // more-indented content within a folded block
            if (sep === ' ')
                sep = '\n';
            else if (!prevMoreIndented && sep === '\n')
                sep = '\n\n';
            value += sep + indent.slice(trimIndent) + content;
            sep = '\n';
            prevMoreIndented = true;
        }
        else if (content === '') {
            // empty line
            if (sep === '\n')
                value += '\n';
            else
                sep = '\n';
        }
        else {
            value += sep + content;
            sep = ' ';
            prevMoreIndented = false;
        }
    }
    switch (header.chomp) {
        case '-':
            break;
        case '+':
            for (let i = chompStart; i < lines.length; ++i)
                value += '\n' + lines[i][0].slice(trimIndent);
            if (value[value.length - 1] !== '\n')
                value += '\n';
            break;
        default:
            value += '\n';
    }
    const end = start + header.length + scalar.source.length;
    return { value, type, comment: header.comment, range: [start, end, end] };
}
function parseBlockScalarHeader({ offset, props }, strict, onError) {
    /* istanbul ignore if should not happen */
    if (props[0].type !== 'block-scalar-header') {
        onError(props[0], 'IMPOSSIBLE', 'Block scalar header not found');
        return null;
    }
    const { source } = props[0];
    const mode = source[0];
    let indent = 0;
    let chomp = '';
    let error = -1;
    for (let i = 1; i < source.length; ++i) {
        const ch = source[i];
        if (!chomp && (ch === '-' || ch === '+'))
            chomp = ch;
        else {
            const n = Number(ch);
            if (!indent && n)
                indent = n;
            else if (error === -1)
                error = offset + i;
        }
    }
    if (error !== -1)
        onError(error, 'UNEXPECTED_TOKEN', `Block scalar header includes extra characters: ${source}`);
    let hasSpace = false;
    let comment = '';
    let length = source.length;
    for (let i = 1; i < props.length; ++i) {
        const token = props[i];
        switch (token.type) {
            case 'space':
                hasSpace = true;
            // fallthrough
            case 'newline':
                length += token.source.length;
                break;
            case 'comment':
                if (strict && !hasSpace) {
                    const message = 'Comments must be separated from other tokens by white space characters';
                    onError(token, 'MISSING_CHAR', message);
                }
                length += token.source.length;
                comment = token.source.substring(1);
                break;
            case 'error':
                onError(token, 'UNEXPECTED_TOKEN', token.message);
                length += token.source.length;
                break;
            /* istanbul ignore next should not happen */
            default: {
                const message = `Unexpected token in block scalar header: ${token.type}`;
                onError(token, 'UNEXPECTED_TOKEN', message);
                const ts = token.source;
                if (ts && typeof ts === 'string')
                    length += ts.length;
            }
        }
    }
    return { mode, indent, chomp, comment, length };
}
/** @returns Array of lines split up as `[indent, content]` */
function splitLines(source) {
    const split = source.split(/\n( *)/);
    const first = split[0];
    const m = first.match(/^( *)/);
    const line0 = m?.[1]
        ? [m[1], first.slice(m[1].length)]
        : ['', first];
    const lines = [line0];
    for (let i = 1; i < split.length; i += 2)
        lines.push([split[i], split[i + 1]]);
    return lines;
}

exports.resolveBlockScalar = resolveBlockScalar;

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