mirror of
https://github.com/scratchfoundation/scratch-parser.git
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38 lines
1.7 KiB
JavaScript
38 lines
1.7 KiB
JavaScript
/**
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* Converts string from unpack method into a project object. Note: this method
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* will be expanded greatly in the future in order to support the Scratch 1.4
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* file format. For now, this is nothing but an (awkward) async wrapper around
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* the `JSON.parse` function.
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* @param {string} input Stringified JSON object
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* @param {Function} callback Returns error or parsed JSON object
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* @return {void}
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*/
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module.exports = function (input, callback) {
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var result;
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try {
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// The input is a JSON string, which may contain control characters
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// that should be removed. See LLK/scratch-vm#1077
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// So far we've only encountered the backspace control character,
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// so remove that specific one before continuing.
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// SB2 JSONs and SB3 JSONs have different versions of the
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// character serialized (e.g. \u0008 and \b), strip out both versions
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result = JSON.parse(input.replace(
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/(\\+)(b|u0008)/g,
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(match, backslash, code) => {
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// If the number is odd, there is an actual backspace.
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if (backslash.length % 2) {
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// The match contains an actual backspace, instead of backslashes followed by b.
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// Remove backspace and keep backslashes that are not part of
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// the control character representation.
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return match.replace('\\' + code, '');
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}
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// They are just backslashes followed by b or u0008. (e.g. "\\b")
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// Don't replace in this case. (LLK/scratch-parser#56)
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return match;
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}
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));
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} catch (e) {
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return callback(e.toString());
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}
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return callback(null, result);
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};
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