@inlang/paraglide-js
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JavaScript
/**
* Detects the formatting of a JSON file and returns a function
* that can be used to stringify JSON with the same formatting.
*
* @example
* const file = await fs.readFile("./messages.json", { encoding: "utf-8" })
* const stringify = detectJsonFormatting(file)
* const newFile = stringify(json)
*/
export const detectJsonFormatting = (file) => {
const endsWithNewLine = file.endsWith("\n");
const spacing = guessJsonIndent(file);
return (value, replacer) => JSON.stringify(value, replacer, spacing) +
(endsWithNewLine ? "\n" : "");
};
/**
* vendored from https://github.com/ehmicky/guess-json-indent
*/
// Guess the indentation of a JSON string
const guessJsonIndent = (jsonString) => {
const firstIndex = skipWhitespaces(jsonString, 0);
if (firstIndex === undefined ||
!isJsonObjectOrArray(jsonString[firstIndex])) {
return;
}
const secondIndex = skipWhitespaces(jsonString, firstIndex + 1);
if (secondIndex === undefined) {
return;
}
return getIndent(jsonString, firstIndex, secondIndex);
};
// Whitespaces are ignored before|between|after tokens in JSON.
// Uses imperative logic for performance.
const skipWhitespaces = (jsonString, startIndex) => {
for (let index = startIndex; index < jsonString.length; index += 1) {
const character = jsonString[index];
if (!isJsonWhitespace(character)) {
return index;
}
}
return;
};
// JSON defines only those are valid whitespaces
const isJsonWhitespace = (character) => character === " " ||
character === "\t" ||
character === "\n" ||
character === "\r";
// If the top-level value is another type than an object or an array, there is
// no possible indentation
const isJsonObjectOrArray = (character) => character === "{" || character === "[";
// Uses imperative logic for performance
// @ts-expect-error - not all code paths return a value
const getIndent = (jsonString, firstIndex, secondIndex) => {
let indent;
for (let index = secondIndex - 1; index > firstIndex; index -= 1) {
const character = jsonString[index];
if (character === "\r") {
return;
}
if (character === "\n") {
return normalizeIndent(indent);
}
if (indent === undefined) {
indent = character;
}
else if (indent[0] === character) {
indent += character;
}
else {
return;
}
}
};
const normalizeIndent = (indent) => {
if (indent === undefined) {
return 0;
}
return indent[0] === " " ? indent.length : indent;
};
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