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import { Ok, Error } from './gleam.mjs'
import { UnexpectedByte, UnexpectedEndOfInput } from './gleam/json.mjs'
const Runtime = {
chromium: 'chromium',
spidermonkey: 'spidermonkey',
jscore: 'jscore',
}
export function json_to_string(json) {
return JSON.stringify(json)
}
export function object(entries) {
return Object.fromEntries(entries)
}
export function identity(x) {
return x
}
export function array(list) {
return list.toArray()
}
export function do_null() {
return null
}
export function decode(string) {
try {
const result = JSON.parse(string)
return new Ok(result)
} catch (err) {
return new Error(getJsonDecodeError(err, string))
}
}
function getJsonDecodeError(stdErr, json) {
if (isUnexpectedEndOfInput(stdErr)) return new UnexpectedEndOfInput()
const unexpectedByteRuntime = getUnexpectedByteRuntime(stdErr)
if (unexpectedByteRuntime) return toUnexpectedByteError(unexpectedByteRuntime, stdErr, json)
return new UnexpectedByte('', 0)
}
/**
* Matches unexpected end of input messages in:
* - Chromium (edge, chrome, node)
* - Spidermonkey (firefox)
* - JavascriptCore (safari)
*
* Note that Spidermonkey and JavascriptCore will both incorrectly report some
* UnexpectedByte errors as UnexpectedEndOfInput errors. For example:
*
* @example
* // in JavascriptCore
* JSON.parse('{"a"]: "b"})
* // => JSON Parse error: Expected ':' before value
*
* JSON.parse('{"a"')
* // => JSON Parse error: Expected ':' before value
*
* // in Chromium (correct)
* JSON.parse('{"a"]: "b"})
* // => Unexpected token ] in JSON at position 4
*
* JSON.parse('{"a"')
* // => Unexpected end of JSON input
*
* // in Chromium (correct)
*
*/
const unexpectedEndOfInputRegex = /((unexpected (end|eof))|(end of data)|(unterminated string)|(json( parse error|\.parse)\: expected '(\:|\}|\])'))/i
function isUnexpectedEndOfInput(err) {
return unexpectedEndOfInputRegex.test(err.message)
}
/**
* Matches unexpected byte messages in:
* - Chromium (edge, chrome, node)
*
* Matches the character and its position.
*/
const chromiumUnexpectedByteRegex = /unexpected token (.) in JSON at position (\d+)/
/**
* Matches unexpected byte messages in:
* - JavascriptCore (safari)
*
* JavascriptCore only reports what the character is and not its position.
*/
const jsCoreUnexpectedByteRegex = /unexpected identifier "(.)"/i
/**
* Matches unexpected byte messages in:
* - Spidermonkey (firefox)
*
* Matches the position in a 2d grid only and not the character.
*/
const spidermonkeyUnexpectedByteRegex = /((unexpected character|expected double-quoted property name) at line (\d+) column (\d+))/i
function getUnexpectedByteRuntime(err) {
if (chromiumUnexpectedByteRegex.test(err.message)) return Runtime.chromium
if (jsCoreUnexpectedByteRegex.test(err.message)) return Runtime.jscore
if (spidermonkeyUnexpectedByteRegex.test(err.message)) return Runtime.spidermonkey
return null
}
function toUnexpectedByteError(runtime, err, json) {
switch (runtime) {
case Runtime.chromium:
return toChromiumUnexpectedByteError(err)
case Runtime.spidermonkey:
return toSpidermonkeyUnexpectedByteError(err, json)
case Runtime.jscore:
return toJsCoreUnexpectedByteError(err)
}
}
function toChromiumUnexpectedByteError(err) {
const match = chromiumUnexpectedByteRegex.exec(err.message)
const byte = toHex(match[1])
const position = Number(match[2])
return new UnexpectedByte(byte, position)
}
function toSpidermonkeyUnexpectedByteError(err, json) {
const match = spidermonkeyUnexpectedByteRegex.exec(err.message)
const line = Number(match[1])
const column = Number(match[2])
const position = getPositionFromMultiline(line, column, json)
const byte = toHex(err.message[position])
return new UnexpectedByte(byte, position)
}
function toJsCoreUnexpectedByteError(err) {
const match = jsCoreUnexpectedByteRegex.exec(err.message)
const byte = toHex(match[1])
return new UnexpectedByte(byte, 0)
}
function toHex(char) {
return "0x" + char.charCodeAt(0).toString(16).toUpperCase()
}
/**
* Gets the position of a character in a flattened (i.e. single line) string
* from a line and column number. Note that the position is 0-indexed and
* the line and column numbers are 1-indexed.
*
* @param {number} line
* @param {number} column
* @param {string} string
*/
function getPositionFromMultiline(line, column, string) {
if (line === 1) return column - 1
let currentLn = 1
let position = 0
string.split('').find((char, idx) => {
if (char === '\n') currentLn += 1
if (currentLn === line) {
position = idx + column
return true
}
return false
})
return position
}
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