Proposal proposal-well-formed-stringify

Stage 3 Draft / December 12, 2018

Well-formed JSON.stringify

1Runtime Semantics: QuoteJSONString ( value )

The abstract operation QuoteJSONString with argument value wraps a String value in QUOTATION MARK code units and escapes certain other code units within it.

  1. Let product be the String value consisting solely of the code unit 0x0022 (QUOTATION MARK).
  2. For each code unitpoint C in value when interpreted as UTF-16 encoded Unicode text as described in 6.1.4, do
    1. If the numeric value of C is listed in the Code Unit ValuePoint column of Table 1, then
      1. Set product to the string-concatenation of product and the Escape Sequence for C as specified in Table 1.
    2. Else if C has a numeric value less than 0x0020 (SPACE), or C has the same numeric value as a leading-surrogate code unit or trailing-surrogate code unit, then
      1. Let unit be a code unit whose numeric value is that of C.
      2. Set product to the string-concatenation of product and UnicodeEscape(unit).
    3. Else,
      1. Set product to the string-concatenation of product and the UTF16Encoding of C.
  3. Set product to the string-concatenation of product and the code unit 0x0022 (QUOTATION MARK).
  4. Return product.
Table 1: JSON Single Character Escape Sequences
Code Unit ValuePoint Unicode Character Name Escape Sequence
0x0008U+0008 BACKSPACE \b
0x0009U+0009 CHARACTER TABULATION \t
0x000AU+000A LINE FEED (LF) \n
0x000CU+000C FORM FEED (FF) \f
0x000DU+000D CARRIAGE RETURN (CR) \r
0x0022U+0022 QUOTATION MARK \"
0x005CU+005C REVERSE SOLIDUS \\

ACopyright & Software License

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© 2018 Richard Gibson

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