Correctly handle CSV files with a single separator throughout

better auto-detection of CSV delimiter
- files with a tsv extension are automatically detected as tab delimited
- other files parsed as CSV go through the following steps:
  - if the first line contains at least 3 of the same separator, it uses that separator as a delimiter
  - if the first line contains only one supported separator character, it uses that separator as a delimiter
  - otherwise it falls back to treating all supported delimiters as the delimiter

 supported delimiters, in precedence order:
 - comma `,`
 - semi-colon `;`
 - tab `\t`
 - pipe `|`

assets/syntaxes/02_Extra/CSV.sublime-syntax → assets/syntaxes/02_Extra/CSV/CSV-comma.sublime-syntax

@@ -2,20 +2,21 @@
 ---
 # See http://www.sublimetext.com/docs/3/syntax.html
 name: Comma Separated Values
-file_extensions:
-  - csv
-  - tsv
-scope: text.csv
+scope: text.csv.comma
 variables:
-  field_separator: (?:[,;|\t])
+  field_separator: (?:,)
   record_separator: (?:$\n?)
 contexts:
-  prototype:
-    - match: (?={{record_separator}})
-      pop: true
+  main:
+    - match: '^'
+      push: fields
+
   fields:
-    - match: ""
+    - include: record_separator
+    - match: ''
       push:
+        - field_or_record_separator
+        - field5
         - field_or_record_separator
         - field4
         - field_or_record_separator
@@ -24,54 +25,55 @@ contexts:
         - field2
         - field_or_record_separator
         - field1
-  main:
-    - meta_include_prototype: false
-    - match: "^"
-      set: fields
 
-  field_or_record_separator:
+  record_separator_pop:
+    - match: (?={{record_separator}})
+      pop: true
+
+  record_separator:
     - meta_include_prototype: false
-    - match: "{{record_separator}}"
+    - match: '{{record_separator}}'
       scope: punctuation.terminator.record.csv
       pop: true
-    - match: "{{field_separator}}"
+
+  field_or_record_separator:
+    - meta_include_prototype: false
+    - include: record_separator_pop
+    - match: '{{field_separator}}'
       scope: punctuation.separator.sequence.csv
       pop: true
 
   field_contents:
     - match: '"'
       scope: punctuation.definition.string.begin.csv
-      push: double_quoted_string
-
-    - match: (?={{field_separator}}|{{record_separator}})
-      pop: true
+      push: scope:text.csv#double_quoted_string
 
-  double_quoted_string:
-    - meta_include_prototype: false
-    - meta_scope: string.quoted.double.csv
-    - match: '""'
-      scope: constant.character.escape.csv
-    - match: '"'
-      scope: punctuation.definition.string.end.csv
+    - include: record_separator_pop
+    - match: (?={{field_separator}})
       pop: true
 
   field1:
-    - match: ""
+    - match: ''
       set:
-        - meta_content_scope: meta.field-1.csv support.type
+        - meta_content_scope: meta.field-1.csv variable.parameter
         - include: field_contents
   field2:
-    - match: ""
+    - match: ''
       set:
         - meta_content_scope: meta.field-2.csv support.function
         - include: field_contents
   field3:
-    - match: ""
+    - match: ''
       set:
         - meta_content_scope: meta.field-3.csv constant.numeric
         - include: field_contents
   field4:
-    - match: ""
+    - match: ''
       set:
         - meta_content_scope: meta.field-4.csv keyword.operator
         - include: field_contents
+  field5:
+    - match: ''
+      set:
+        - meta_content_scope: meta.field-5.csv string.unquoted
+        - include: field_contents

assets/syntaxes/02_Extra/CSV/CSV-pipe.sublime-syntax

@@ -0,0 +1,80 @@
+%YAML 1.2
+---
+# See http://www.sublimetext.com/docs/3/syntax.html
+name: Pipe Separated Values
+scope: text.csv.pipe
+variables:
+  field_separator: (?:\|)
+  record_separator: (?:$\n?)
+
+contexts:
+  main:
+    - match: '^'
+      push: fields
+
+  fields:
+    - include: record_separator
+    - match: ''
+      push:
+        - field_or_record_separator
+        - field5
+        - field_or_record_separator
+        - field4
+        - field_or_record_separator
+        - field3
+        - field_or_record_separator
+        - field2
+        - field_or_record_separator
+        - field1
+
+  record_separator_pop:
+    - match: (?={{record_separator}})
+      pop: true
+
+  record_separator:
+    - meta_include_prototype: false
+    - match: '{{record_separator}}'
+      scope: punctuation.terminator.record.csv
+      pop: true
+
+  field_or_record_separator:
+    - meta_include_prototype: false
+    - include: record_separator_pop
+    - match: '{{field_separator}}'
+      scope: punctuation.separator.sequence.csv
+      pop: true
+
+  field_contents:
+    - match: '"'
+      scope: punctuation.definition.string.begin.csv
+      push: scope:text.csv#double_quoted_string
+
+    - include: record_separator_pop
+    - match: (?={{field_separator}})
+      pop: true
+
+  field1:
+    - match: ''
+      set:
+        - meta_content_scope: meta.field-1.csv variable.parameter
+        - include: field_contents
+  field2:
+    - match: ''
+      set:
+        - meta_content_scope: meta.field-2.csv support.function
+        - include: field_contents
+  field3:
+    - match: ''
+      set:
+        - meta_content_scope: meta.field-3.csv constant.numeric
+        - include: field_contents
+  field4:
+    - match: ''
+      set:
+        - meta_content_scope: meta.field-4.csv keyword.operator
+        - include: field_contents
+  field5:
+    - match: ''
+      set:
+        - meta_content_scope: meta.field-5.csv string.unquoted
+        - include: field_contents

assets/syntaxes/02_Extra/CSV/CSV-semi-colon.sublime-syntax

@@ -0,0 +1,79 @@
+%YAML 1.2
+---
+# See http://www.sublimetext.com/docs/3/syntax.html
+name: Semi-Colon Separated Values
+scope: text.csv.semi-colon
+variables:
+  field_separator: (?:;)
+  record_separator: (?:$\n?)
+contexts:
+  main:
+    - match: '^'
+      push: fields
+
+  fields:
+    - include: record_separator
+    - match: ''
+      push:
+        - field_or_record_separator
+        - field5
+        - field_or_record_separator
+        - field4
+        - field_or_record_separator
+        - field3
+        - field_or_record_separator
+        - field2
+        - field_or_record_separator
+        - field1
+
+  record_separator_pop:
+    - match: (?={{record_separator}})
+      pop: true
+
+  record_separator:
+    - meta_include_prototype: false
+    - match: '{{record_separator}}'
+      scope: punctuation.terminator.record.csv
+      pop: true
+
+  field_or_record_separator:
+    - meta_include_prototype: false
+    - include: record_separator_pop
+    - match: '{{field_separator}}'
+      scope: punctuation.separator.sequence.csv
+      pop: true
+
+  field_contents:
+    - match: '"'
+      scope: punctuation.definition.string.begin.csv
+      push: scope:text.csv#double_quoted_string
+
+    - include: record_separator_pop
+    - match: (?={{field_separator}})
+      pop: true
+
+  field1:
+    - match: ''
+      set:
+        - meta_content_scope: meta.field-1.csv variable.parameter
+        - include: field_contents
+  field2:
+    - match: ''
+      set:
+        - meta_content_scope: meta.field-2.csv support.function
+        - include: field_contents
+  field3:
+    - match: ''
+      set:
+        - meta_content_scope: meta.field-3.csv constant.numeric
+        - include: field_contents
+  field4:
+    - match: ''
+      set:
+        - meta_content_scope: meta.field-4.csv keyword.operator
+        - include: field_contents
+  field5:
+    - match: ''
+      set:
+        - meta_content_scope: meta.field-5.csv string.unquoted
+        - include: field_contents

assets/syntaxes/02_Extra/CSV/CSV.sublime-syntax

@@ -0,0 +1,113 @@
+%YAML 1.2
+---
+# See http://www.sublimetext.com/docs/3/syntax.html
+name: Separated Values
+file_extensions:
+  - csv
+scope: text.csv
+variables:
+  field_separator_chars: ',;\t|'
+  field_separator: (?:[{{field_separator_chars}}])
+  record_separator: (?:$\n?)
+contexts:
+  main:
+    - meta_include_prototype: false
+    - include: three_field_separators
+    - include: single_separator_type_on_line
+    - match: '^'
+      push: unknown-separated-main
+
+  three_field_separators:
+    - match: ^(?=(?:[^,]*,){3})
+      set: scope:text.csv.comma
+    - match: ^(?=(?:[^;]*;){3})
+      set: scope:text.csv.semi-colon
+    - match: ^(?=(?:[^\t]*\t){3})
+      set: scope:text.csv.tab
+    - match: ^(?=(?:[^|]*\|){3})
+      set: scope:text.csv.pipe
+
+  single_separator_type_on_line:
+    - match: ^(?=[^{{field_separator_chars}}]*,[^;\t|]*$)
+      set: scope:text.csv.comma
+    - match: ^(?=[^{{field_separator_chars}}]*;[^,\t|]*$)
+      set: scope:text.csv.semi-colon
+    - match: ^(?=[^{{field_separator_chars}}]*\t[^,;|]*$)
+      set: scope:text.csv.tab
+    - match: ^(?=[^{{field_separator_chars}}]*\|[^,;\t]*$)
+      set: scope:text.csv.pipe
+
+  unknown-separated-main:
+    - include: record_separator
+    - match: ''
+      push:
+        - field_or_record_separator
+        - field5
+        - field_or_record_separator
+        - field4
+        - field_or_record_separator
+        - field3
+        - field_or_record_separator
+        - field2
+        - field_or_record_separator
+        - field1
+
+  record_separator_pop:
+    - match: (?={{record_separator}})
+      pop: true
+
+  record_separator:
+    - meta_include_prototype: false
+    - match: '{{record_separator}}'
+      scope: punctuation.terminator.record.csv
+
+  field_or_record_separator:
+    - meta_include_prototype: false
+    - include: record_separator_pop
+    - match: '{{field_separator}}'
+      scope: punctuation.separator.sequence.csv
+      pop: true
+
+  field_contents:
+    - match: '"'
+      scope: punctuation.definition.string.begin.csv
+      push: double_quoted_string
+
+    - include: record_separator_pop
+    - match: (?={{field_separator}})
+      pop: true
+
+  double_quoted_string:
+    - meta_include_prototype: false
+    - meta_scope: string.quoted.double.csv
+    - match: '""'
+      scope: constant.character.escape.csv
+    - match: '"'
+      scope: punctuation.definition.string.end.csv
+      pop: true
+
+  field1:
+    - match: ''
+      set:
+        - meta_content_scope: meta.field-1.csv variable.parameter
+        - include: field_contents
+  field2:
+    - match: ''
+      set:
+        - meta_content_scope: meta.field-2.csv support.function
+        - include: field_contents
+  field3:
+    - match: ''
+      set:
+        - meta_content_scope: meta.field-3.csv constant.numeric
+        - include: field_contents
+  field4:
+    - match: ''
+      set:
+        - meta_content_scope: meta.field-4.csv keyword.operator
+        - include: field_contents
+  field5:
+    - match: ''
+      set:
+        - meta_content_scope: meta.field-5.csv string.unquoted
+        - include: field_contents