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✏️ Editing: composer.js

'use strict';

var directives = require('../doc/directives.js');
var Document = require('../doc/Document.js');
var errors = require('../errors.js');
var identity = require('../nodes/identity.js');
var composeDoc = require('./compose-doc.js');
var resolveEnd = require('./resolve-end.js');

function getErrorPos(src) {
    if (typeof src === 'number')
        return [src, src + 1];
    if (Array.isArray(src))
        return src.length === 2 ? src : [src[0], src[1]];
    const { offset, source } = src;
    return [offset, offset + (typeof source === 'string' ? source.length : 1)];
}
function parsePrelude(prelude) {
    let comment = '';
    let atComment = false;
    let afterEmptyLine = false;
    for (let i = 0; i < prelude.length; ++i) {
        const source = prelude[i];
        switch (source[0]) {
            case '#':
                comment +=
                    (comment === '' ? '' : afterEmptyLine ? '\n\n' : '\n') +
                        (source.substring(1) || ' ');
                atComment = true;
                afterEmptyLine = false;
                break;
            case '%':
                if (prelude[i + 1]?.[0] !== '#')
                    i += 1;
                atComment = false;
                break;
            default:
                // This may be wrong after doc-end, but in that case it doesn't matter
                if (!atComment)
                    afterEmptyLine = true;
                atComment = false;
        }
    }
    return { comment, afterEmptyLine };
}
/**
 * Compose a stream of CST nodes into a stream of YAML Documents.
 *
 * ```ts
 * import { Composer, Parser } from 'yaml'
 *
 * const src: string = ...
 * const tokens = new Parser().parse(src)
 * const docs = new Composer().compose(tokens)
 * ```
 */
class Composer {
    constructor(options = {}) {
        this.doc = null;
        this.atDirectives = false;
        this.prelude = [];
        this.errors = [];
        this.warnings = [];
        this.onError = (source, code, message, warning) => {
            const pos = getErrorPos(source);
            if (warning)
                this.warnings.push(new errors.YAMLWarning(pos, code, message));
            else
                this.errors.push(new errors.YAMLParseError(pos, code, message));
        };
        // eslint-disable-next-line @typescript-eslint/prefer-nullish-coalescing
        this.directives = new directives.Directives({ version: options.version || '1.2' });
        this.options = options;
    }
    decorate(doc, afterDoc) {
        const { comment, afterEmptyLine } = parsePrelude(this.prelude);
        //console.log({ dc: doc.comment, prelude, comment })
        if (comment) {
            const dc = doc.contents;
            if (afterDoc) {
                doc.comment = doc.comment ? `${doc.comment}\n${comment}` : comment;
            }
            else if (afterEmptyLine || doc.directives.docStart || !dc) {
                doc.commentBefore = comment;
            }
            else if (identity.isCollection(dc) && !dc.flow && dc.items.length > 0) {
                let it = dc.items[0];
                if (identity.isPair(it))
                    it = it.key;
                const cb = it.commentBefore;
                it.commentBefore = cb ? `${comment}\n${cb}` : comment;
            }
            else {
                const cb = dc.commentBefore;
                dc.commentBefore = cb ? `${comment}\n${cb}` : comment;
            }
        }
        if (afterDoc) {
            Array.prototype.push.apply(doc.errors, this.errors);
            Array.prototype.push.apply(doc.warnings, this.warnings);
        }
        else {
            doc.errors = this.errors;
            doc.warnings = this.warnings;
        }
        this.prelude = [];
        this.errors = [];
        this.warnings = [];
    }
    /**
     * Current stream status information.
     *
     * Mostly useful at the end of input for an empty stream.
     */
    streamInfo() {
        return {
            comment: parsePrelude(this.prelude).comment,
            directives: this.directives,
            errors: this.errors,
            warnings: this.warnings
        };
    }
    /**
     * Compose tokens into documents.
     *
     * @param forceDoc - If the stream contains no document, still emit a final document including any comments and directives that would be applied to a subsequent document.
     * @param endOffset - Should be set if `forceDoc` is also set, to set the document range end and to indicate errors correctly.
     */
    *compose(tokens, forceDoc = false, endOffset = -1) {
        for (const token of tokens)
            yield* this.next(token);
        yield* this.end(forceDoc, endOffset);
    }
    /** Advance the composer by one CST token. */
    *next(token) {
        if (process.env.LOG_STREAM)
            console.dir(token, { depth: null });
        switch (token.type) {
            case 'directive':
                this.directives.add(token.source, (offset, message, warning) => {
                    const pos = getErrorPos(token);
                    pos[0] += offset;
                    this.onError(pos, 'BAD_DIRECTIVE', message, warning);
                });
                this.prelude.push(token.source);
                this.atDirectives = true;
                break;
            case 'document': {
                const doc = composeDoc.composeDoc(this.options, this.directives, token, this.onError);
                if (this.atDirectives && !doc.directives.docStart)
                    this.onError(token, 'MISSING_CHAR', 'Missing directives-end/doc-start indicator line');
                this.decorate(doc, false);
                if (this.doc)
                    yield this.doc;
                this.doc = doc;
                this.atDirectives = false;
                break;
            }
            case 'byte-order-mark':
            case 'space':
                break;
            case 'comment':
            case 'newline':
                this.prelude.push(token.source);
                break;
            case 'error': {
                const msg = token.source
                    ? `${token.message}: ${JSON.stringify(token.source)}`
                    : token.message;
                const error = new errors.YAMLParseError(getErrorPos(token), 'UNEXPECTED_TOKEN', msg);
                if (this.atDirectives || !this.doc)
                    this.errors.push(error);
                else
                    this.doc.errors.push(error);
                break;
            }
            case 'doc-end': {
                if (!this.doc) {
                    const msg = 'Unexpected doc-end without preceding document';
                    this.errors.push(new errors.YAMLParseError(getErrorPos(token), 'UNEXPECTED_TOKEN', msg));
                    break;
                }
                this.doc.directives.docEnd = true;
                const end = resolveEnd.resolveEnd(token.end, token.offset + token.source.length, this.doc.options.strict, this.onError);
                this.decorate(this.doc, true);
                if (end.comment) {
                    const dc = this.doc.comment;
                    this.doc.comment = dc ? `${dc}\n${end.comment}` : end.comment;
                }
                this.doc.range[2] = end.offset;
                break;
            }
            default:
                this.errors.push(new errors.YAMLParseError(getErrorPos(token), 'UNEXPECTED_TOKEN', `Unsupported token ${token.type}`));
        }
    }
    /**
     * Call at end of input to yield any remaining document.
     *
     * @param forceDoc - If the stream contains no document, still emit a final document including any comments and directives that would be applied to a subsequent document.
     * @param endOffset - Should be set if `forceDoc` is also set, to set the document range end and to indicate errors correctly.
     */
    *end(forceDoc = false, endOffset = -1) {
        if (this.doc) {
            this.decorate(this.doc, true);
            yield this.doc;
            this.doc = null;
        }
        else if (forceDoc) {
            const opts = Object.assign({ _directives: this.directives }, this.options);
            const doc = new Document.Document(undefined, opts);
            if (this.atDirectives)
                this.onError(endOffset, 'MISSING_CHAR', 'Missing directives-end indicator line');
            doc.range = [0, endOffset, endOffset];
            this.decorate(doc, false);
            yield doc;
        }
    }
}

exports.Composer = Composer;

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