/
stringifyPair.ts
168 lines (159 loc) · 4.62 KB
/
stringifyPair.ts
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import { isCollection, isNode, isScalar, isSeq } from '../nodes/Node.js'
import type { Pair } from '../nodes/Pair.js'
import { Scalar } from '../nodes/Scalar.js'
import { stringify, StringifyContext } from './stringify.js'
import { indentComment, lineComment } from './stringifyComment.js'
export function stringifyPair(
{ key, value }: Readonly<Pair>,
ctx: StringifyContext,
onComment?: () => void,
onChompKeep?: () => void
) {
const {
allNullValues,
doc,
indent,
indentStep,
options: { commentString, indentSeq, simpleKeys }
} = ctx
let keyComment = (isNode(key) && key.comment) || null
if (simpleKeys) {
if (keyComment) {
throw new Error('With simple keys, key nodes cannot have comments')
}
if (isCollection(key)) {
const msg = 'With simple keys, collection cannot be used as a key value'
throw new Error(msg)
}
}
let explicitKey =
!simpleKeys &&
(!key ||
(keyComment && value == null && !ctx.inFlow) ||
isCollection(key) ||
(isScalar(key)
? key.type === Scalar.BLOCK_FOLDED || key.type === Scalar.BLOCK_LITERAL
: typeof key === 'object'))
ctx = Object.assign({}, ctx, {
allNullValues: false,
implicitKey: !explicitKey && (simpleKeys || !allNullValues),
indent: indent + indentStep
})
let keyCommentDone = false
let chompKeep = false
let str = stringify(
key,
ctx,
() => (keyCommentDone = true),
() => (chompKeep = true)
)
if (!explicitKey && !ctx.inFlow && str.length > 1024) {
if (simpleKeys)
throw new Error(
'With simple keys, single line scalar must not span more than 1024 characters'
)
explicitKey = true
}
if (ctx.inFlow) {
if (allNullValues || value == null) {
if (keyCommentDone && onComment) onComment()
return str === '' ? '?' : explicitKey ? `? ${str}` : str
}
} else if ((allNullValues && !simpleKeys) || (value == null && explicitKey)) {
str = `? ${str}`
if (keyComment && !keyCommentDone) {
str += lineComment(str, ctx.indent, commentString(keyComment))
} else if (chompKeep && onChompKeep) onChompKeep()
return str
}
if (keyCommentDone) keyComment = null
if (explicitKey) {
if (keyComment)
str += lineComment(str, ctx.indent, commentString(keyComment))
str = `? ${str}\n${indent}:`
} else {
str = `${str}:`
if (keyComment)
str += lineComment(str, ctx.indent, commentString(keyComment))
}
let vsb, vcb, valueComment
if (isNode(value)) {
vsb = !!value.spaceBefore
vcb = value.commentBefore
valueComment = value.comment
} else {
vsb = false
vcb = null
valueComment = null
if (value && typeof value === 'object') value = doc.createNode(value)
}
ctx.implicitKey = false
if (!explicitKey && !keyComment && isScalar(value))
ctx.indentAtStart = str.length + 1
chompKeep = false
if (
!indentSeq &&
indentStep.length >= 2 &&
!ctx.inFlow &&
!explicitKey &&
isSeq(value) &&
!value.flow &&
!value.tag &&
!value.anchor
) {
// If indentSeq === false, consider '- ' as part of indentation where possible
ctx.indent = ctx.indent.substring(2)
}
let valueCommentDone = false
const valueStr = stringify(
value,
ctx,
() => (valueCommentDone = true),
() => (chompKeep = true)
)
let ws = ' '
if (keyComment || vsb || vcb) {
ws = vsb ? '\n' : ''
if (vcb) {
const cs = commentString(vcb)
ws += `\n${indentComment(cs, ctx.indent)}`
}
if (valueStr === '' && !ctx.inFlow) {
if (ws === '\n') ws = '\n\n'
} else {
ws += `\n${ctx.indent}`
}
} else if (!explicitKey && isCollection(value)) {
const vs0 = valueStr[0]
const nl0 = valueStr.indexOf('\n')
const hasNewline = nl0 !== -1
const flow = ctx.inFlow ?? value.flow ?? value.items.length === 0
if (hasNewline || !flow) {
let hasPropsLine = false
if (hasNewline && (vs0 === '&' || vs0 === '!')) {
let sp0 = valueStr.indexOf(' ')
if (
vs0 === '&' &&
sp0 !== -1 &&
sp0 < nl0 &&
valueStr[sp0 + 1] === '!'
) {
sp0 = valueStr.indexOf(' ', sp0 + 1)
}
if (sp0 === -1 || nl0 < sp0) hasPropsLine = true
}
if (!hasPropsLine) ws = `\n${ctx.indent}`
}
} else if (valueStr === '' || valueStr[0] === '\n') {
ws = ''
}
str += ws + valueStr
if (ctx.inFlow) {
if (valueCommentDone && onComment) onComment()
} else if (valueComment && !valueCommentDone) {
str += lineComment(str, ctx.indent, commentString(valueComment))
} else if (chompKeep && onChompKeep) {
onChompKeep()
}
return str
}