improved the sml linter (#445)

* improved the sml linter

* made matching operator agnostic to user settings

* added tests for sml

ale_linters/sml/smlnj.vim

@@ -12,20 +12,34 @@ function! ale_linters#sml#smlnj#Handle(buffer, lines) abort
 
     let l:out = []
     let l:pattern = '^.*\:\([0-9\.]\+\)\ \(\w\+\)\:\ \(.*\)'
+    let l:pattern2 = '^.*\:\([0-9]\+\)\.\?\([0-9]\+\).* \(\(Warning\|Error\): .*\)'
 
     for l:line in a:lines
-        let l:match = matchlist(l:line, l:pattern)
+        let l:match2 = matchlist(l:line, l:pattern2)
 
-        if len(l:match) == 0
+        if len(l:match2) != 0
-            continue
+          call add(l:out, {
+          \   'bufnr': a:buffer,
+          \   'lnum': l:match2[1] + 0,
+          \   'col' : l:match2[2] - 1,
+          \   'text': l:match2[3],
+          \   'type': l:match2[3] =~# '^Warning' ? 'W' : 'E',
+          \})
+          continue
+        endif
+
+        let l:match = matchlist(l:line, l:pattern)
+
+        if len(l:match) != 0
+          call add(l:out, {
+          \   'bufnr': a:buffer,
+          \   'lnum': l:match[1] + 0,
+          \   'text': l:match[2] . ': ' . l:match[3],
+          \   'type': l:match[2] ==# 'error' ? 'E' : 'W',
+          \})
+          continue
         endif
 
-        call add(l:out, {
-        \   'bufnr': a:buffer,
-        \   'lnum': l:match[1] + 0,
-        \   'text': l:match[2] . ': ' . l:match[3],
-        \   'type': l:match[2] ==# 'error' ? 'E' : 'W',
-        \})
     endfor
 
     return l:out

test/handler/test_sml_handler.vader

@@ -0,0 +1,91 @@
+Before:
+  runtime ale_linters/sml/smlnj.vim
+
+Execute (Testing on EOF error):
+  AssertEqual [
+  \ {
+  \   'bufnr': 42,
+  \   'lnum': 2,
+  \   'col': 15,
+  \   'type': 'E',
+  \   'text': 'Error: syntax error found at EOF',
+  \ },
+  \],
+  \ ale_linters#sml#smlnj#Handle(42, [
+  \ "Standard ML of New Jersey v110.78 [built: Thu Jul 23 11:21:58 2015]",
+  \ "[opening a.sml]",
+  \ "a.sml:2.16 Error: syntax error found at EOF",
+  \ '/usr/lib/smlnj/bin/sml: Fatal error -- Uncaught exception Compile with "syntax error" raised at ../compiler/Parse/main/smlfile.sml:15.24-15.46',
+  \])
+
+Execute (Testing if the handler can handle multiple errors on the same line):
+  AssertEqual [
+  \ {
+  \   'bufnr': 42,
+  \   'lnum': 1,
+  \   'col': 5,
+  \   'type': 'E',
+  \   'text': "Error: can't find function arguments in clause",
+  \ },
+  \ {
+  \   'bufnr': 42,
+  \   'lnum': 1,
+  \   'col': 12,
+  \   'type': 'E',
+  \   'text': 'Error: unbound variable or constructor: wow',
+  \ },
+  \],
+  \ ale_linters#sml#smlnj#Handle(42, [
+  \ "Standard ML of New Jersey v110.78 [built: Thu Jul 23 11:21:58 2015]",
+  \ "[opening test.sml]",
+  \ "a.sml:1.6-1.10 Error: can't find function arguments in clause",
+  \ "a.sml:1.13-1.16 Error: unbound variable or constructor: wow",
+  \ "/usr/lib/smlnj/bin/sml: Fatal error -- Uncaught exception Error with 0",
+  \ "raised at ../compiler/TopLevel/interact/evalloop.sml:66.19-66.27",
+  \])
+
+Execute (Testing rarer errors):
+  AssertEqual [
+  \ {
+  \   'bufnr': 42,
+  \   'lnum': 5,
+  \   'col': 18,
+  \   'type': 'E',
+  \   'text': "Error: syntax error found at ID",
+  \ },
+  \ {
+  \   'bufnr': 42,
+  \   'lnum': 7,
+  \   'col': 0,
+  \   'type': 'E',
+  \   'text': "Error: value type in structure doesn't match signature spec",
+  \ },
+  \],
+  \ ale_linters#sml#smlnj#Handle(42, [
+  \ "Standard ML of New Jersey v110.78 [built: Thu Jul 23 11:21:58 2015]",
+  \ "[opening test.sml]",
+  \ "a.sml:5.19 Error: syntax error found at ID",
+  \ "a.sml:7.1-9.27 Error: value type in structure doesn't match signature spec",
+  \ "/usr/lib/smlnj/bin/sml: Fatal error -- Uncaught exception Error with 0",
+  \ "raised at ../compiler/TopLevel/interact/evalloop.sml:66.19-66.27",
+  \])
+
+Execute (Testing a warning):
+  AssertEqual [
+  \ {
+  \   'bufnr': 42,
+  \   'lnum': 4,
+  \   'col': 4,
+  \   'type': 'W',
+  \   'text': "Warning: match nonexhaustive",
+  \ },
+  \],
+  \ ale_linters#sml#smlnj#Handle(42, [
+  \ "Standard ML of New Jersey v110.78 [built: Thu Jul 23 11:21:58 2015]",
+  \ "[opening a.sml]",
+  \ "a.sml:4.5-4.12 Warning: match nonexhaustive",
+            \ "0 => ...",
+  \ "val f = fn : int -> int",
+  \ "-",
+  \])
+