On Tue, 01 Oct 2024 10:33:50 +0900 (JST)
Tatsuo Ishii <is...@postgresql.org> wrote:

> >> That's because non-breaking space (nbsp) is not encoded as 0xa0 in
> >> UTF-8. nbsp in UTF-8 is "0xc2 0xa0" (2 bytes) (A 0xa0 is a nbsp's code
> >> point in Unicode. i.e. U+00A0).
> >> So grep -P "[\xC2\xA0]" should work to detect nbsp.
> > 
> > `LC_ALL=C grep -P "\xC2\xA0"` works for my environment. 
> > ([ and ] were not necessary.)
> > 
> > When LC_ALL is null, `grep -P "\xA0"` could not detect any characters in 
> > charset.sgml,
> > but I think it is better to specify both LC_ALL=C and "\xC2\xA0" for making 
> > sure detecting
> > nbsp.
> > 
> > One problem is that -P option can be used in only GNU grep, and grep in mac 
> > doesn't support it.
> > 
> > On bash, we can also use `grep $'\xc2\xa0'`, but I am not sure we can 
> > assume the shell is bash.
> > 
> > Maybe, better way is use perl itself rather than grep as following.
> > 
> >  `perl -ne '/\xC2\xA0/ and print' `
> > 
> > I attached a patch fixed in this way.
> 
> GNU sed can also be used without setting LC_ALL:
> 
> sed -n /"\xC2\xA0"/p
> 
> However I am not sure if non-GNU sed can do this too...

Although I've not check it myself, BSD sed doesn't support \x escape according 
to [1].

[1] 
https://stackoverflow.com/questions/24275070/sed-not-giving-me-correct-substitute-operation-for-newline-with-mac-difference

By the way, I've attached a patch a bit modified to use the plural form 
statement
as same as check-tabs.

 Non-breaking **spaces** appear in SGML/XML files


Regards,
Yugo Nagata

> 
> Best reagards,
> --
> Tatsuo Ishii
> SRA OSS K.K.
> English: http://www.sraoss.co.jp/index_en/
> Japanese:http://www.sraoss.co.jp


-- 
Yugo NAGATA <nag...@sraoss.co.jp>
diff --git a/doc/src/sgml/Makefile b/doc/src/sgml/Makefile
index 9c9bbfe375..17feae9ed0 100644
--- a/doc/src/sgml/Makefile
+++ b/doc/src/sgml/Makefile
@@ -194,7 +194,7 @@ MAKEINFO = makeinfo
 ##
 
 # Quick syntax check without style processing
-check: postgres.sgml $(ALLSGML) check-tabs
+check: postgres.sgml $(ALLSGML) check-tabs check-nbsp
 	$(XMLLINT) $(XMLINCLUDE) --noout --valid $<
 
 
@@ -259,6 +259,9 @@ endif # sqlmansectnum != 7
 check-tabs:
 	@( ! grep '	' $(wildcard $(srcdir)/*.sgml $(srcdir)/ref/*.sgml $(srcdir)/*.xsl) ) || (echo "Tabs appear in SGML/XML files" 1>&2;  exit 1)
 
+check-nbsp:
+	@( ! $(PERL) -ne '/\xC2\xA0/ and print "$$ARGV $$_"' $(wildcard $(srcdir)/*.sgml $(srcdir)/ref/*.sgml $(srcdir)/*.xsl) ) || (echo "Non-breaking spaces appear in SGML/XML files" 1>&2;  exit 1)
+
 ##
 ## Clean
 ##

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