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Add support for \u escape in fromJSON

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As fromTOML supports \u and \U escapes, bring fromJSON on par. As JSON defaults
to UTF-8 encoding (every JSON parser must support UTF-8), this change parses the
`\u hex hex hex hex` sequence (\u followed by 4 hexadecimal digits) into an
UTF-8 representation.

Add a test to verify correct parsing, using all escape sequences from json.org.
This commit is contained in:
Nikola Knezevic 2020-01-07 00:06:49 +01:00
parent cb2d348d48
commit 52a8f9295b
3 changed files with 90 additions and 2 deletions
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1
tests/lang/eval-okay-fromjson-escapes.exp Normal file
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"quote \" reverse solidus \\ solidus / backspace  formfeed newline \n carriage return \r horizontal tab \t 1 char unicode encoded backspace  1 char unicode encoded e with accent é 2 char unicode encoded s with caron š 3 char unicode encoded rightwards arrow →"

3
tests/lang/eval-okay-fromjson-escapes.nix Normal file
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# This string contains all supported escapes in a JSON string, per json.org
# \b and \f are not supported by Nix
builtins.fromJSON ''"quote \" reverse solidus \\ solidus \/ backspace \b formfeed \f newline \n carriage return \r horizontal tab \t 1 char unicode encoded backspace \u0008 1 char unicode encoded e with accent \u00e9 2 char unicode encoded s with caron \u0161 3 char unicode encoded rightwards arrow \u2192"''