commit 340db1ed82f8ced40a3e778c08963005369e2926
author Markus Armbruster <armbru@redhat.com> Thu Aug 23 18:39:45 2018 +0200
committer Markus Armbruster <armbru@redhat.com> Fri Aug 24 20:26:37 2018 +0200
tree c1fef7097ff604764f708120567b7aa608ff80be
parent a2ec6be72b80770b063cf08c95c78f0d36705355

json: Reject unescaped control characters

Fix the lexer to reject unescaped control characters in JSON strings,
in accordance with RFC 8259 "The JavaScript Object Notation (JSON)
Data Interchange Format".

Bonus: we now recover more nicely from unclosed strings.  E.g.

    {"one: 1}\n{"two": 2}

now recovers cleanly after the newline, where before the lexer
remained confused until the next unpaired double quote or lexical
error.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20180823164025.12553-19-armbru@redhat.com>