Add support for syntax highlighting and completions of extends values

Package/PackageDev.sublime-settings

@@ -30,6 +30,13 @@
     // settings file for this to take effect.
     "settings.show_quick_edit_icon": true,
 
+    // List of patterns for syntax not to be displayed in completions.
+    // Each theme containing one of the list's strings is hidden.
+    "settings.exclude_syntax_patterns": [
+        "*.tmLanguage",
+        "Packages/zzz A File Icon zzz/**"
+    ],
+
     // Whether or not to keep the scope suffix in the suggested test scopes
     // i.e. if the base scope is text.html.markdown
     // then suggest meta.example.markdown (true) vs meta.example (false).

Package/Sublime Text Syntax Definition/Sublime Text Syntax Definition.sublime-syntax

@@ -133,6 +133,7 @@ contexts:
       captures:
         1: string.unquoted.plain.out.yaml storage.type.extends.sublime-syntax
         2: punctuation.separator.key-value.yaml
+      push: expect_extends_list
 
     - match: ((?:hidden_)?file_extensions)\s*(:)(?=\s|$)
       captures:
@@ -162,6 +163,52 @@ contexts:
 
     - include: scope:source.yaml
 
+  expect_extends_list:
+    - meta_content_scope: meta.extends.sublime-syntax
+    - include: comment
+    - include: yaml-tags-anchors
+    # array-like context list
+    - match: \[
+      scope: punctuation.definition.array.begin.sublime-syntax
+      set:
+        - meta_scope: meta.extends.sublime-syntax meta.flow-sequence.yaml
+        - match: \]
+          scope: punctuation.definition.array.end.sublime-syntax
+          pop: true
+        - match: ','
+          scope: punctuation.separator.array-element.sublime-syntax
+        - match: '{{plain_scalar_but_not_block_key}}'
+          push: extended_syntax_file
+        - include: comment
+        - include: yaml-tags-anchors
+    # multi-line context list
+    - match: ^([ ]+)(?=-\s*{{plain_scalar_but_not_block_key}})
+      set:
+        - meta_scope: meta.extends.sublime-syntax meta.block-sequence.yaml
+        # pop off at none-empty line with different indention than first item
+        - match: ^(?!(\s*$|\1-))
+          pop: true
+        - match: '{{plain_scalar_but_not_block_key}}'
+          push: extended_syntax_file
+        - include: comment
+        - include: yaml-block-sequence
+        - match: \S.*$
+          scope: invalid.illegal.extends.sublime-syntax
+    # maybe single include
+    - match: '{{plain_scalar_but_not_block_key}}'
+      set:
+        - meta_scope: meta.extends.sublime-syntax meta.path.sublime-syntax string.unquoted.plain.out.yaml
+        - include: extended_syntax_file
+    - match: ^(?=\s*$)
+      pop: 1
+
+  extended_syntax_file:
+    - meta_scope: meta.path.sublime-syntax string.unquoted.plain.out.yaml
+    - match: '{{_flow_scalar_end_plain_in}}'
+      pop: true
+    - match: /
+      scope: punctuation.separator.path.sublime-syntax
+
   variables_block:
     - meta_scope: meta.block.variables.sublime-syntax
     - include: comment

Package/Sublime Text Syntax Definition/syntax_test_sublime-syntax.yaml

@@ -13,7 +13,26 @@ version: 2
 extends: Packages/Default/Text.sublime-syntax
 #^^^^^^ string.unquoted.plain.out.yaml storage.type.extends.sublime-syntax
 #      ^ punctuation.separator.key-value.yaml
-#        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ string.unquoted.plain.out.yaml
+#       ^ meta.extends - meta.path
+#        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ meta.extends.sublime-syntax meta.path.sublime-syntax string.unquoted.plain.out.yaml
+#                ^ punctuation.separator.path.sublime-syntax
+#                        ^ punctuation.separator.path.sublime-syntax
+#                                            ^ - meta.extends - meta.path
+extends: [ Text.sublime-syntax , Source.sublime-syntax ]
+#        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ meta.extends.sublime-syntax meta.flow-sequence.yaml
+#         ^ - meta.path
+#          ^^^^^^^^^^^^^^^^^^^ meta.path.sublime-syntax string.unquoted.plain.out.yaml
+#                             ^^^ - meta.path
+#                                ^^^^^^^^^^^^^^^^^^^^^ meta.path.sublime-syntax string.unquoted.plain.out.yaml
+#                                                     ^^ - meta.path
+extends:
+  - Packages/Default/Text.sublime-syntax
+# <- meta.extends.sublime-syntax meta.block-sequence.yaml
+#^^^ meta.extends.sublime-syntax meta.block-sequence.yaml
+#   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ meta.extends.sublime-syntax meta.block-sequence.yaml meta.path.sublime-syntax string.unquoted.plain.out.yaml
+#           ^ punctuation.separator.path.sublime-syntax
+#                   ^ punctuation.separator.path.sublime-syntax
+#                                       ^ meta.extends.sublime-syntax meta.block-sequence.yaml - meta.path
 file_extensions: [a, b]
 #^^^^^^^^^^^^^^ string.unquoted.plain.out.yaml entity.name.tag.yaml
 #                ^^^^^^ meta.flow-sequence.yaml, meta.sequence.flow.yaml

plugins/syntax_dev/completions.py

@@ -1,6 +1,8 @@
 import logging
 import re
 from collections import namedtuple
+from fnmatch import fnmatch
+from sublime_lib.resource_path import ResourcePath
 
 import sublime
 import sublime_plugin
@@ -266,6 +268,12 @@ def match_selector(selector, offset=0):
         ):
             result = self._complete_branch_point()
 
+        elif match_selector(
+            "meta.extends",
+            -1,
+        ):
+            result = self._complete_syntax_file()
+
         # Auto-completion for variables in match patterns using 'variables' keys
         elif match_selector("keyword.other.variable"):
             result = self._complete_variable()
@@ -299,6 +307,45 @@ def _complete_context(self, prefix, locations):
             kind=TPL_CONTEXT.kind,
         )
 
+    def _complete_syntax_file(self):
+        completions = []
+        kind = (sublime.KIND_ID_VARIABLE, 's', 'Syntax')
+
+        settings = sublime.load_settings("PackageDev.sublime-settings")
+        excludes = settings.get("settings.exclude_syntax_patterns", [])
+        if not isinstance(excludes, list):
+            excludes = []
+
+        try:
+            my_folder = str(ResourcePath.from_file_path(self.view.file_name()).parent)
+        except (TypeError, ValueError):
+            my_folder = ""
+
+        for syntax in sublime.list_syntaxes():
+            if any(fnmatch(syntax.path, pattern) for pattern in excludes):
+                continue
+            # add relative resource path completion (file name of siblings)
+            if my_folder:
+                folder, file = syntax.path.rsplit("/", 1)
+                if folder == my_folder:
+                    completions.append(
+                        sublime.CompletionItem(
+                            trigger=file,
+                            kind=kind,
+                            annotation="hidden" if syntax.hidden else ""
+                        )
+                    )
+            # add full resource path
+            completions.append(
+                sublime.CompletionItem(
+                    trigger=syntax.path,
+                    kind=kind,
+                    annotation="hidden" if syntax.hidden else ""
+                )
+            )
+
+        return completions
+
     def _complete_keyword(self, prefix, locations):
 
         def match_selector(selector, offset=0):