Fix PHP column matching for unexpected single quotes (#370)

* PHP: Fix column matching for unexpected single quotes

Unexpected single quotes resulted in an empty match, because PHP
surrounds the errors with quotes, and we check for the next quote to be
the ending delimiter.

For example: an unexpected string 'foo' would be presented as
`unexpected ''foo''`, and then the match would be `''`. The inner part
of that match is an empty string.

This adds a check for the keyword "expecting". Any quote after
"expecting" won't be matched, so we can use greedy matching instead of
non-greedy.

* PHP: Use "very magic"

The pattern started to get unreadable

Also replaced non-greedy matching (`\{-}`) by greedy matching, because
we don't need to match non-greedily anymore and it reads a little nicer.

* PHP: Add tests for column matches

And with that, also a test for unexpected single quotes.

ale_linters/php/php.vim

@@ -5,7 +5,7 @@ function! ale_linters#php#php#Handle(buffer, lines) abort
     " Matches patterns like the following:
     "
     " PHP Parse error:  syntax error, unexpected ';', expecting ']' in - on line 15
-    let l:pattern = 'Parse error:\s\+\(.\{-}unexpected ''\(.\{-}\)''.\{-}\|.*\) in - on line \(\d\+\)'
+    let l:pattern = '\vParse error:\s+(.+unexpected ''(.+)%(expecting.+)@<!''.*|.+) in - on line (\d+)'
 
     let l:output = []
 

test/test_php_handler.vader

@@ -1,3 +1,9 @@
+Given (Some invalid lines of PHP):
+  [foo;]
+  class Foo { / }
+  $foo)
+  ['foo' 'bar']
+
 Execute(The php handler should parse lines correctly):
   runtime ale_linters/php/php.vim
 
@@ -5,30 +11,30 @@ Execute(The php handler should parse lines correctly):
   \ [
   \   {
   \     'bufnr': 347,
-  \     'lnum': 47,
+  \     'lnum': 1,
-  \     'col': 0,
+  \     'col': 5,
   \     'text': "syntax error, unexpected ';', expecting ']'",
   \     'type': 'E',
   \   },
   \   {
   \     'bufnr': 347,
-  \     'lnum': 56,
+  \     'lnum': 2,
-  \     'col': 0,
+  \     'col': 13,
   \     'text': "syntax error, unexpected '/', expecting function (T_FUNCTION) or const (T_CONST)",
   \     'type': 'E',
   \   },
   \   {
   \     'bufnr': 347,
-  \     'lnum': 13,
+  \     'lnum': 3,
-  \     'col': 0,
+  \     'col': 5,
   \     'text': "syntax error, unexpected ')'",
   \     'type': 'E',
   \   },
   \   {
   \     'bufnr': 347,
-  \     'lnum': 5,
+  \     'lnum': 4,
-  \     'col': 0,
+  \     'col': 8,
-  \     'text': "Invalid numeric literal",
+  \     'text': "syntax error, unexpected ''bar'' (T_CONSTANT_ENCAPSED_STRING), expecting ']'",
   \     'type': 'E',
   \   },
   \   {
@@ -38,14 +44,22 @@ Execute(The php handler should parse lines correctly):
   \     'text': "syntax error, unexpected end of file",
   \     'type': 'E',
   \   },
+  \   {
+  \     'bufnr': 347,
+  \     'lnum': 47,
+  \     'col': 0,
+  \     'text': "Invalid numeric literal",
+  \     'type': 'E',
+  \   },
   \ ],
   \ ale_linters#php#php#Handle(347, [
   \   'This line should be ignored completely',
-  \   "PHP Parse error:  syntax error, unexpected ';', expecting ']' in - on line 47",
+  \   "PHP Parse error:  syntax error, unexpected ';', expecting ']' in - on line 1",
-  \   "PHP Parse error:  syntax error, unexpected '/', expecting function (T_FUNCTION) or const (T_CONST) in - on line 56",
+  \   "PHP Parse error:  syntax error, unexpected '/', expecting function (T_FUNCTION) or const (T_CONST) in - on line 2",
-  \   "PHP Parse error:  syntax error, unexpected ')' in - on line 13",
+  \   "PHP Parse error:  syntax error, unexpected ')' in - on line 3",
-  \   'PHP Parse error: Invalid numeric literal in - on line 5',
+  \   "PHP Parse error:  syntax error, unexpected ''bar'' (T_CONSTANT_ENCAPSED_STRING), expecting ']' in - on line 4",
   \   'PHP Parse error:  syntax error, unexpected end of file in - on line 21',
+  \   'PHP Parse error: Invalid numeric literal in - on line 47',
   \ ])
 
 After: