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scanner: avoid spurious errors about empty character literals

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On an invalid character literal such as "'\777'" we used to produce
two errors:

    input.y:2.9-12: error: invalid number after \-escape: 777
    input.y:2.8-13: error: empty character literal

Get rid of the second one.

* src/scan-gram.l (STRING_GROW_ESCAPE): New.
* tests/input.at: Adjust.
This commit is contained in:
Akim Demaille
2020-04-27 08:06:49 +02:00
parent 3262747c5b
commit 89c4e1becf
2 changed files with 22 additions and 28 deletions
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10
tests/input.at
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@@ -2408,25 +2408,15 @@ AT_PERL_REQUIRE([[-e 'print "start: \"\\\t\\\f\\\0\\\1\" ;";' >> input.y]])
AT_BISON_CHECK([input.y], [1], [],
[[input.y:2.9-12: error: invalid number after \-escape: 777
input.y:2.8-13: error: empty character literal
input.y:2.16-17: error: invalid number after \-escape: 0
input.y:2.15-18: error: empty character literal
input.y:2.21-25: error: invalid number after \-escape: xfff
input.y:2.20-26: error: empty character literal
input.y:2.29-31: error: invalid number after \-escape: x0
input.y:2.28-32: error: empty character literal
input.y:3.9-14: error: invalid number after \-escape: uffff
input.y:3.8-15: error: empty character literal
input.y:3.18-23: error: invalid number after \-escape: u0000
input.y:3.17-24: error: empty character literal
input.y:3.27-36: error: invalid number after \-escape: Uffffffff
input.y:3.26-37: error: empty character literal
input.y:3.40-49: error: invalid number after \-escape: U00000000
input.y:3.39-50: error: empty character literal
input.y:4.9-10: error: invalid character after \-escape: ' '
input.y:4.8-11: error: empty character literal
input.y:4.14-15: error: invalid character after \-escape: A
input.y:4.13-16: error: empty character literal
input.y:5.9-16: error: invalid character after \-escape: \t
input.y:5.17: error: invalid character after \-escape: \f
input.y:5.18: error: invalid character after \-escape: \0