44 lines
1.8 KiB
TypeScript
44 lines
1.8 KiB
TypeScript
import type { JsonValue } from './json-value.ts'
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export type JsonSpelling = 'compact' | 'two-space'
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type Member = { label: string; value: JsonValue }
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type Pending = string | { depth: number; value: JsonValue }
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export function serializeCanonicalJson(value: JsonValue, spelling: JsonSpelling): string {
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const indent = spelling === 'compact' ? '' : ' '
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const text: string[] = []
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const pending: Pending[] = [{ depth: 0, value }]
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for (let next = pending.pop(); next !== undefined; next = pending.pop()) {
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if (typeof next === 'string') {
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text.push(next)
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continue
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}
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const { depth, value: held } = next
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if (Array.isArray(held)) schedule(pending, '[', held.map((item) => ({ label: '', value: item })), ']', indent, depth)
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else if (held !== null && typeof held === 'object') schedule(pending, '{', objectMembers(held, indent), '}', indent, depth)
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else text.push(Object.is(held, -0) ? '-0' : JSON.stringify(held))
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}
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return text.join('')
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}
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function objectMembers(value: { [key: string]: JsonValue }, indent: string): Member[] {
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const separator = indent === '' ? ':' : ': '
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return Object.keys(value)
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.sort()
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.map((key) => ({ label: `${JSON.stringify(key)}${separator}`, value: value[key] ?? null }))
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}
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function schedule(pending: Pending[], open: string, members: readonly Member[], close: string, indent: string, depth: number): void {
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if (members.length === 0) {
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pending.push(`${open}${close}`)
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return
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}
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const inner = indent === '' ? '' : `\n${indent.repeat(depth + 1)}`
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const scheduled: Pending[] = []
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for (const [index, member] of members.entries()) scheduled.push(`${index === 0 ? open : ','}${inner}${member.label}`, { depth: depth + 1, value: member.value })
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scheduled.push(indent === '' ? close : `\n${indent.repeat(depth)}${close}`)
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for (const item of scheduled.reverse()) pending.push(item)
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}
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