Commits on Jul 1, 2021

1. RFC: Support full Unicode in lexer …

   Depends on #3115
   
   Implements RFC at graphql/graphql-spec#849.
   
   * Replaces `isSourceCharacter` with `isUnicodeScalarValue`
   * Adds `isSupplementaryCodePoint`, used in String, BlockStrings, and Comments to ensure correct lexing of JavaScript's UTF-16 source.
   * Updates `printCodePointAt` to correctly print supplementary code points.
   * Adds variable-width Unicode escape sequences
   * Adds explicit support for legacy JSON-style fixed-width Unicode escape sequence surrogate pairs.
   * Adds `printString` to no longer rely on `JSON.stringify`. Borrows some implementation details from Node.js internals for string printing.
   
     Implements:
   
     > When producing a {StringValue}, implementations should use escape sequences to
     > represent non-printable control characters (U+0000 to U+001F and U+007F to
     > U+009F). Other escape sequences are not necessary, however an implementation may
     > use escape sequences to represent any other range of code points.
   
   Closes #2449
   
   Co-authored-by: Andreas Marek <andimarek@fastmail.fm>

   

   leebyron and andimarek committed Jul 1, 2021
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