Edit report at https://bugs.php.net/bug.php?id=65544&edit=1
ID: 65544
Updated by: nikic@php.net
Reported by: ww dot galen at gmail dot com
Summary: mb title case conversion-first word in quotation
isn't capitalized
Status: Verified
Type: Bug
Package: mbstring related
PHP Version: 5.4 and later
Block user comment: N
Private report: N
New Comment:
Unicode specifies the following algorithm for title-casing:
toTitlecase(X): Find the word boundaries in X according to Unicode Standard Annex #29, "Unicode
Text Segmentation." For each word boundary, find the first cased character F following the word
boundary. If F exists, map F to Titlecase_Mapping(F); then map all characters C between F and the
following word boundary to Lowercase_Mapping(C).
The part about title-casing the first cased character would be simple enough to implement. However,
correct detection of word boundaries is pretty tricky and I don't think we're going to
support this.
There is also an older obsolete algorithm from UTR #21:
For each character C, find the preceding character B.
ignore any intervening case-ignorable characters when finding B.
If B exists, and is cased
map C to UCD_lower(C)
Otherwise,
map C to UCD_title(C)
Using this algorithm would also resolve the issue, because:
* At the "o" after '"' the previous non-case-ignorable character is
'"', which is not cased, so we convert to title-case.
* At the "t" after "'" the previous non-case-ignorable character is
"n" (because "'" is case-ignorable), which is cased, so we convert to
lower-case.
* At the "h" after "'" the previous non-case-ignorable character is "
" (because "'" is case-ignorable), whic his not cased, so we convert to
title-case.
This would also fix bug #71298, because U+2019 is case-ignorable.
It would not resolve the "5th" issue in #36311, because at the "t" the previous
non-case-ignorable character is "5", which is not cased, so this would be converted to
"5Th". However, the result would be the same using the current title-casing algorithm:
Under UAX #29 rule WB 10 there is no word-boundary inside "5th", so that the first cased
character after the word boundary before "5" would be "t", giving the same
result. As such, I would say that the current result in bug #36311 is correct.
Previous Comments:
------------------------------------------------------------------------
[2013-08-25 09:51:29] yohgaki@php.net
Question is "is this supposed to work?"
There is " before 'or' and no space before word.
Expected result:
----------------
"Or Else It Doesn't, You Know. The Name Of The Song Is Called 'Haddocks'
Eyes.'"
Any comments?
------------------------------------------------------------------------
[2013-08-25 09:49:08] yohgaki@php.net
verified with PHP-5.5 and master branch
------------------------------------------------------------------------
[2013-08-25 01:25:22] ww dot galen at gmail dot com
Description:
------------
When mb_convert_case() is used in MB_CASE_TITLE mode, the first letter character in a
quotation immediately
following the quotation mark isn't uppercased.
According to the Unicode 4 standard, § 3.13, when title-casing a string the first *cased
character* in a word is
supposed to be converted to title case. In the PHP implementation
(php_unicode_convert_case() in
php_unicode.c), the first *character* is converted to title case. Coupled with the fix for #46626
(which makes
characters in "Punctuation, Other" word characters), quotation marks are converted to
title case, rather than
the first letter following.
Tested with PHP 5.4, but the same code is present in every version of PHP since 5.2.7 (including
5.5) as well.
Test script:
---------------
<?php
echo mb_convert_case("\"or else it doesn't, you know. the name of the song is called
'haddocks' eyes.'\"\n", MB_CASE_TITLE);
Expected result:
----------------
"Or Else It Doesn't, You Know. The Name Of The Song Is Called 'Haddocks'
Eyes.'"
Actual result:
--------------
"or Else It Doesn't, You Know. The Name Of The Song Is Called 'haddocks'
Eyes.'"
------------------------------------------------------------------------
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Edit this bug report at https://bugs.php.net/bug.php?id=65544&edit=1