/
composer.ts
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/
composer.ts
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import { Directives } from '../doc/directives.js'
import { Document } from '../doc/Document.js'
import { ErrorCode, YAMLParseError, YAMLWarning } from '../errors.js'
import { isCollection, isPair } from '../nodes/Node.js'
import {
defaultOptions,
DocumentOptions,
ParseOptions,
SchemaOptions
} from '../options.js'
import type { Token } from '../parse/cst.js'
import { composeDoc } from './compose-doc.js'
import { resolveEnd } from './resolve-end.js'
export type ComposeErrorHandler = (
offset: number,
code: ErrorCode,
message: string,
warning?: boolean
) => void
function parsePrelude(prelude: string[]) {
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)
* ```
*/
export class Composer {
private directives: Directives
private doc: Document.Parsed | null = null
private options: ParseOptions & DocumentOptions & SchemaOptions
private atDirectives = false
private prelude: string[] = []
private errors: YAMLParseError[] = []
private warnings: YAMLWarning[] = []
constructor(options: ParseOptions & DocumentOptions & SchemaOptions = {}) {
this.directives = new Directives({
version: options.version || defaultOptions.version
})
this.options = options
}
private onError = (
offset: number,
code: ErrorCode,
message: string,
warning?: boolean
) => {
if (warning) this.warnings.push(new YAMLWarning(offset, code, message))
else this.errors.push(new YAMLParseError(offset, code, message))
}
private decorate(doc: Document.Parsed, afterDoc: boolean) {
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.marker || !dc) {
doc.commentBefore = comment
} else if (isCollection(dc) && !dc.flow && dc.items.length > 0) {
let it = dc.items[0]
if (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: Iterable<Token>, 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: Token) {
if (process.env.LOG_STREAM) console.dir(token, { depth: null })
switch (token.type) {
case 'directive':
this.directives.add(token.source, (offset, message, warning) =>
this.onError(offset, 'BAD_DIRECTIVE', message, warning)
)
this.prelude.push(token.source)
this.atDirectives = true
break
case 'document': {
const doc = composeDoc(
this.options,
this.directives,
token,
this.onError
)
if (this.atDirectives && !doc.directives.marker)
this.onError(
token.offset,
'MISSING_CHAR',
'Missing directives-end 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}: ${JSON.stringify(token.source)}`
: token.message
const error = new YAMLParseError(-1, 'UNEXPECTED_TOKEN', msg)
if (this.atDirectives || !this.doc) this.errors.push(error)
else this.doc.errors.push(error)
break
}
case 'doc-end': {
if (!this.doc) {
const msg = 'Unexpected doc-end without preceding document'
this.errors.push(
new YAMLParseError(token.offset, 'UNEXPECTED_TOKEN', msg)
)
break
}
const end = resolveEnd(
token.end,
token.offset + token.source.length,
this.doc.options.strict,
this.onError
)
this.decorate(this.doc, true)
if (end.comment) {
const dc = this.doc.comment
this.doc.comment = dc ? `${dc}\n${end.comment}` : end.comment
}
this.doc.range[2] = end.offset
break
}
default:
this.errors.push(
new YAMLParseError(
-1,
'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(undefined, opts) as Document.Parsed
if (this.atDirectives)
this.onError(
endOffset,
'MISSING_CHAR',
'Missing directives-end indicator line'
)
doc.range = [0, endOffset, endOffset]
this.decorate(doc, false)
yield doc
}
}
}