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diagnostics: fix the handling of multibyte characters

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This is a pity: efforts were invested in computing correctly the
number of screen columns consumed by multibyte characters, but the
routines that do that were fed by single-byte inputs...

As a consequence Bison never displayed correctly locations when there
are multibyte characters.

* src/scan-gram.l (mbchar): New.
Use it instead of . in the catch-all clause.
* tests/diagnostics.at (Tabulations): Enhance into...
(Tabulations and multibyte characters): this.
This commit is contained in:
Akim Demaille
2019-04-21 08:56:49 +02:00
parent 6b6c3de2ae
commit afe7dfd3b9
2 changed files with 52 additions and 12 deletions
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48
tests/diagnostics.at
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@@ -17,22 +17,31 @@
AT_BANNER([[Diagnostics.]])
# AT_TEST([TITLE], [GRAMMAR], [OUTPUT-WITH-STYLE])
# ------------------------------------------------
m4_pushdef([AT_TEST],
[
AT_SETUP([$1])
AT_KEYWORDS([diagnostics])
# We need UTF-8 support for correct screen-width computation of UTF-8
# characters. Skip the test if not available.
AT_SKIP_IF([! locale -a | grep '^en_US.UTF-8$'])
AT_BISON_OPTION_PUSHDEFS
AT_DATA_GRAMMAR([[input.y]], [$2])
AT_DATA([experr], [$3])
AT_BISON_CHECK([-fcaret --style=debug -Wall input.y], [], [], [experr])
# Cannot use AT_BISON_CHECK easily as we need to change the
# environment.
# FIXME: Enhance AT_BISON_CHECK.
AT_CHECK([LC_ALL=en_US.UTF-8 bison -fcaret --style=debug -Wall input.y], [], [], [experr])
# When no style, same messages, except the style.
# When no style, same messages, but without style.
AT_CHECK([perl -pi -e 's{</?\w+>}{}g' experr])
AT_BISON_CHECK([-fcaret -Wall input.y], [], [], [experr])
AT_CHECK([LC_ALL=en_US.UTF-8 bison -fcaret -Wall input.y], [], [], [experr])
AT_BISON_OPTION_POPDEFS
@@ -106,18 +115,24 @@ input.y:17.2: <warning>warning:</warning> empty rule without %empty [<warning>-W
]])
## ------------- ##
## Tabulations. ##
## ------------- ##
## -------------------------------------- ##
## Tabulations and multibyte characters. ##
## -------------------------------------- ##
# Make sure we treat tabulations as eight spaces.
# Make sure we treat tabulations as eight spaces, and that multibyte
# characters have correct width.
AT_TEST([[Tabulations]],
AT_TEST([[Tabulations and multibyte characters]],
[[%%
exp: a b c
exp: a b c d e f g h
a: { }
b: { }
c: {------------}
d: {éééééééééééé}
e: {∇⃗×𝐸⃗ = -∂𝐵⃗/∂t}
f: { 42 }
g: { "฿¥$€₦" }
h: { 🐃 }
]],
[[input.y:11.4-17: <warning>warning:</warning> empty rule without %empty [<warning>-Wempty-rule</warning>]
a: <warning>{ }</warning>
@@ -128,6 +143,21 @@ input.y:12.4-17: <warning>warning:</warning> empty rule without %empty [<warning
input.y:13.4-17: <warning>warning:</warning> empty rule without %empty [<warning>-Wempty-rule</warning>]
c: <warning>{------------}</warning>
<warning>^~~~~~~~~~~~~~</warning>
input.y:14.4-17: <warning>warning:</warning> empty rule without %empty [<warning>-Wempty-rule</warning>]
d: <warning>{éééééééééééé}</warning>
<warning>^~~~~~~~~~~~~~</warning>
input.y:15.4-17: <warning>warning:</warning> empty rule without %empty [<warning>-Wempty-rule</warning>]
e: <warning>{∇⃗×𝐸⃗ = -∂𝐵⃗/∂t}</warning>
<warning>^~~~~~~~~~~~~~</warning>
input.y:16.4-17: <warning>warning:</warning> empty rule without %empty [<warning>-Wempty-rule</warning>]
f: <warning>{ 42 }</warning>
<warning>^~~~~~~~~~~~~~</warning>
input.y:17.4-17: <warning>warning:</warning> empty rule without %empty [<warning>-Wempty-rule</warning>]
g: <warning>{ "฿¥$€₦" }</warning>
<warning>^~~~~~~~~~~~~~</warning>
input.y:18.4-17: <warning>warning:</warning> empty rule without %empty [<warning>-Wempty-rule</warning>]
h: <warning>{ 🐃 }</warning>
<warning>^~~~~~~~~~~~~~</warning>
]])