Flexible heredoc support

[weirdan]

PHP 7.3 has relaxed the requirements for heredoc/nowdoc end markers (see the corresponding RFC page). Now they allow leading indentation. This plugin, however, doesn't seem to support it yet:

[mikehaertl]

@StanAngeloff Any news here? If you could point to the location that needs to be modified, maybe someone (me?) would find time for a PR. I just never worked on Vim syntax files before so can't promise.

[adriaanzon]

@mikehaertl I added the following to my personal after/syntax/php.vim:

syn region phpHereDoc matchgroup=Delimiter start="\(<<<\)\@3<=\z(\I\i*\)$" end="^\s*\z1\>" contained contains=@Spell,phpIdentifier,phpIdentifierSimply,phpIdentifierComplex,phpSpecialChar,phpMethodsVar,phpStrEsc keepend extend
syn region phpHereDoc matchgroup=Delimiter start=+\(<<<\)\@3<="\z(\I\i*\)"$+ end="^\s*\z1\>" contained contains=@Spell,phpIdentifier,phpIdentifierSimply,phpIdentifierComplex,phpSpecialChar,phpMethodsVar,phpStrEsc keepend extend
" including HTML,JavaScript,SQL if enabled via options
if (exists("php_html_in_heredoc") && php_html_in_heredoc)
      syn region phpHereDoc matchgroup=Delimiter start="\(<<<\)\@3<=\z(\(\I\i*\)\=\(html\)\c\(\i*\)\)$" end="^\s*\z1\>"  contained contains=@htmlTop,phpIdentifier,phpIdentifierSimply,phpIdentifierComplex,phpSpecialChar,phpMethodsVar,phpStrEsc keepend extend
      syn region phpHereDoc matchgroup=Delimiter start="\(<<<\)\@3<=\z(\(\I\i*\)\=\(javascript\)\c\(\i*\)\)$" end="^\s*\z1\>"  contained contains=@htmlJavascript,phpIdentifierSimply,phpIdentifier,phpIdentifierComplex,phpSpecialChar,phpMethodsVar,phpStrEsc keepend extend
endif
if (exists("php_sql_heredoc") && php_sql_heredoc)
      syn region phpHereDoc matchgroup=Delimiter start="\(<<<\)\@3<=\z(\(\I\i*\)\=\(sql\)\c\(\i*\)\)$" end="^\s*\z1\>" contained contains=@sqlTop,phpIdentifier,phpIdentifierSimply,phpIdentifierComplex,phpSpecialChar,phpMethodsVar,phpStrEsc keepend extend
endif
if (exists("php_xml_heredoc") && php_xml_heredoc)
      syn region phpHereDoc matchgroup=Delimiter start="\(<<<\)\@3<=\z(\(\I\i*\)\=\(xml\)\c\(\i*\)\)$" end="^\s*\z1\>" contained contains=@xmlTop,phpIdentifier,phpIdentifierSimply,phpIdentifierComplex,phpSpecialChar,phpMethodsVar,phpStrEsc keepend extend
endif

I never really took the time to PR it into this repo. It is a slightly modified version of this code:

php.vim/syntax/php.vim

Lines 674 to 688 in bbad8f6

	" @begin phpHereDoc
	SynFold syn region phpHereDoc matchgroup=Delimiter start="\(<<<\)\@3<=\z(\I\i*\)$" end="^\z1\(;\=$\)\@=" contained contains=@Spell,phpIdentifier,phpIdentifierSimply,phpIdentifierComplex,phpSpecialChar,phpMethodsVar,phpStrEsc keepend extend
	SynFold syn region phpHereDoc matchgroup=Delimiter start=+\(<<<\)\@3<="\z(\I\i*\)"$+ end="^\z1\(;\=$\)\@=" contained contains=@Spell,phpIdentifier,phpIdentifierSimply,phpIdentifierComplex,phpSpecialChar,phpMethodsVar,phpStrEsc keepend extend
	" including HTML,JavaScript,SQL if enabled via options
	if (exists("php_html_in_heredoc") && php_html_in_heredoc)
	SynFold syn region phpHereDoc matchgroup=Delimiter start="\(<<<\)\@3<=\z(\(\I\i*\)\=\(html\)\c\(\i*\)\)$" end="^\z1\(;\=$\)\@=" contained contains=@htmlTop,phpIdentifier,phpIdentifierSimply,phpIdentifierComplex,phpSpecialChar,phpMethodsVar,phpStrEsc keepend extend
	SynFold syn region phpHereDoc matchgroup=Delimiter start="\(<<<\)\@3<=\z(\(\I\i*\)\=\(javascript\)\c\(\i*\)\)$" end="^\z1\(;\=$\)\@=" contained contains=@htmlJavascript,phpIdentifierSimply,phpIdentifier,phpIdentifierComplex,phpSpecialChar,phpMethodsVar,phpStrEsc keepend extend
	endif
	if (exists("php_sql_heredoc") && php_sql_heredoc)
	SynFold syn region phpHereDoc matchgroup=Delimiter start="\(<<<\)\@3<=\z(\(\I\i*\)\=\(sql\)\c\(\i*\)\)$" end="^\z1\(;\=$\)\@=" contained contains=@sqlTop,phpIdentifier,phpIdentifierSimply,phpIdentifierComplex,phpSpecialChar,phpMethodsVar,phpStrEsc keepend extend
	endif
	if (exists("php_xml_heredoc") && php_xml_heredoc)
	SynFold syn region phpHereDoc matchgroup=Delimiter start="\(<<<\)\@3<=\z(\(\I\i*\)\=\(xml\)\c\(\i*\)\)$" end="^\z1\(;\=$\)\@=" contained contains=@xmlTop,phpIdentifier,phpIdentifierSimply,phpIdentifierComplex,phpSpecialChar,phpMethodsVar,phpStrEsc keepend extend
	endif
	" @end phpHereDoc

[StanAngeloff]

This is now possible following the merge of #95