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const rxParseJson = /position\s(\d+)$/
export function parseJson(s: string, pos: number): unknown {
let endPos: number | undefined
parseJson.message = undefined
let matches: RegExpExecArray | null
if (pos) s = s.slice(pos)
try {
parseJson.position = pos + s.length
return JSON.parse(s)
} catch (e) {
matches = rxParseJson.exec((e as Error).message)
if (!matches) {
parseJson.message = "unexpected end"
return undefined
}
endPos = +matches[1]
const c = s[endPos]
s = s.slice(0, endPos)
parseJson.position = pos + endPos
try {
return JSON.parse(s)
} catch (e1) {
parseJson.message = `unexpected token ${c}`
return undefined
}
}
}
parseJson.message = undefined as string | undefined
parseJson.position = 0 as number
parseJson.code = 'require("ajv/dist/runtime/parseJson").parseJson'
export function parseJsonNumber(s: string, pos: number, maxDigits?: number): number | undefined {
let numStr = ""
let c: string
parseJsonNumber.message = undefined
if (s[pos] === "-") {
numStr += "-"
pos++
}
if (s[pos] === "0") {
numStr += "0"
pos++
} else {
if (!parseDigits(maxDigits)) {
errorMessage()
return undefined
}
}
if (maxDigits) {
parseJsonNumber.position = pos
return +numStr
}
if (s[pos] === ".") {
numStr += "."
pos++
if (!parseDigits()) {
errorMessage()
return undefined
}
}
if (((c = s[pos]), c === "e" || c === "E")) {
numStr += "e"
pos++
if (((c = s[pos]), c === "+" || c === "-")) {
numStr += c
pos++
}
if (!parseDigits()) {
errorMessage()
return undefined
}
}
parseJsonNumber.position = pos
return +numStr
function parseDigits(maxLen?: number): boolean {
let digit = false
while (((c = s[pos]), c >= "0" && c <= "9" && (maxLen === undefined || maxLen-- > 0))) {
digit = true
numStr += c
pos++
}
return digit
}
function errorMessage(): void {
parseJsonNumber.position = pos
parseJsonNumber.message = pos < s.length ? `unexpected token ${s[pos]}` : "unexpected end"
}
}
parseJsonNumber.message = undefined as string | undefined
parseJsonNumber.position = 0 as number
parseJsonNumber.code = 'require("ajv/dist/runtime/parseJson").parseJsonNumber'
const escapedChars: {[X in string]?: string} = {
b: "\b",
f: "\f",
n: "\n",
r: "\r",
t: "\t",
'"': '"',
"/": "/",
"\\": "\\",
}
const CODE_A: number = "a".charCodeAt(0)
const CODE_0: number = "0".charCodeAt(0)
export function parseJsonString(s: string, pos: number): string | undefined {
let str = ""
let c: string | undefined
parseJsonString.message = undefined
// eslint-disable-next-line no-constant-condition, @typescript-eslint/no-unnecessary-condition
while (true) {
c = s[pos++]
if (c === '"') break
if (c === "\\") {
c = s[pos]
if (c in escapedChars) {
str += escapedChars[c]
pos++
} else if (c === "u") {
pos++
let count = 4
let code = 0
while (count--) {
code <<= 4
c = s[pos]
if (c === undefined) {
errorMessage("unexpected end")
return undefined
}
c = c.toLowerCase()
if (c >= "a" && c <= "f") {
code += c.charCodeAt(0) - CODE_A + 10
} else if (c >= "0" && c <= "9") {
code += c.charCodeAt(0) - CODE_0
} else {
errorMessage(`unexpected token ${c}`)
return undefined
}
pos++
}
str += String.fromCharCode(code)
} else {
errorMessage(`unexpected token ${c}`)
return undefined
}
// eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
} else if (c === undefined) {
errorMessage("unexpected end")
return undefined
} else {
if (c.charCodeAt(0) >= 0x20) {
str += c
} else {
errorMessage(`unexpected token ${c}`)
return undefined
}
}
}
parseJsonString.position = pos
return str
function errorMessage(msg: string): void {
parseJsonString.position = pos
parseJsonString.message = msg
}
}
parseJsonString.message = undefined as string | undefined
parseJsonString.position = 0 as number
parseJsonString.code = 'require("ajv/dist/runtime/parseJson").parseJsonString'
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