Fix: Syntax highlighting for various issues (#2810)

* highlighter: Fix region & pattern detection

* syntax/sh: Highlight upper case options too

* syntax/c(pp): Try to synchronize the rules to lower the maintenance effort

* syntax/ruby: Fix explicit filename detection in directories

* highlighter: Respect skip rules in regions

* syntax/sh: Fix parameter expansion, cond. flags and generalize filename via ""

* syntax/php|vi: Correct strings in comments to comments only

Additionally improve vimscript comment handling.

* highlighter: Remove problematic start|end check in find(all)Index()

...and additionally remove recursive region end detection

runtime/syntax/php.yaml

@@ -9,6 +9,9 @@ rules:
     - symbol.tag: "(?i)<[/]?(a(bbr|cronym|ddress|pplet|rea|rticle|side|udio)?|b(ase(font)?|d(i|o)|ig|lockquote|r)?|ca(nvas|ption)|center|cite|co(de|l|lgroup)|d(ata(list)?|d|el|etails|fn|ialog|ir|l|t)|em(bed)?|fieldset|fig(caption|ure)|font|form|(i)?frame|frameset|h[1-6]|hr|i|img|in(put|s)|kbd|keygen|label|legend|li(nk)?|ma(in|p|rk)|menu(item)?|met(a|er)|nav|no(frames|script)|o(l|pt(group|ion)|utput)|p(aram|icture|re|rogress)?|q|r(p|t|uby)|s(trike)?|samp|se(ction|lect)|small|source|span|strong|su(b|p|mmary)|textarea|time|track|u(l)?|var|video|wbr)( .*|>)*?>"
     - symbol.tag.extended: "(?i)<[/]?(body|div|html|head(er)?|footer|title|table|t(body|d|h(ead)?|r|foot))( .*|>)*?>"
     - preproc: "(?i)<[/]?(script|style)( .*|>)*?>"
+    - preproc: "<\\?(php|=)?"
+    - preproc: "\\?>"
+    - preproc: "<!DOCTYPE.+?>"
     - special: "&[^;[[:space:]]]*;"
     - symbol: "[:=]"
     - identifier: "(alt|bgcolor|height|href|label|longdesc|name|onclick|onfocus|onload|onmouseover|size|span|src|style|target|type|value|width)="
@@ -32,6 +35,17 @@ rules:
     - symbol.operator: "(=>|===|!==|==|!=|&&|\\|\\||::|=|->|\\!)"
     - identifier.var: "(\\$[a-zA-Z0-9\\-_]+)"
     - symbol.operator: "[\\(|\\)|/|+|\\-|\\*|\\[|.|,|;]"
+    - symbol.brackets: "(\\[|\\]|\\{|\\}|[()])"
+
+    - comment:
+        start: "(^|[[:space:]])*(//|#)"
+        end: "$"
+        rules: []
+    - comment:
+        start: "/\\*"
+        end: "\\*/"
+        rules: []
+
     - constant.string:
         start: "\""
         end: "\""
@@ -44,14 +58,3 @@ rules:
         skip: "\\\\."
         rules:
             - constant.specialChar: "\\\\[abfnrtv'\\\"\\\\]"
-    - symbol.brackets: "(\\[|\\]|\\{|\\}|[()])"
-    - comment: "(^|[[:space:]])//.*"
-    - comment: "(^|[[:space:]])#.*"
-    - comment:
-        start: "/\\*"
-        end: "\\*/"
-        rules: []
-
-    - preproc: "<\\?(php|=)?"
-    - preproc: "\\?>"
-    - preproc: "<!DOCTYPE.+?>"