add tree-sitter-regex (#1362)

* add tree-sitter-regex

* adapt regex highlights from upstream

* inject regex into elixir sigil_r/2 and sigil_R/2

* generate lang-support docs

* capture interesting nodes in character-ranges

* make $.character_class captures more consistent

* fix fallthrough behavior for character classes

* capture pattern characters as 'string'

* use latest tree-sitter-regex

* set elixir regex injections as combined

* add link to upstream queries

* inject regex in rust into 'Regex::new' raw string literals

1 files changed, 53 insertions, 0 deletions

diff --git a/runtime/queries/regex/highlights.scm b/runtime/queries/regex/highlights.scm
new file mode 100644
index 00000000..9376caa9
--- /dev/null
+++ b/runtime/queries/regex/highlights.scm
@@ -0,0 +1,53 @@
+; upstream: https://github.com/tree-sitter/tree-sitter-regex/blob/e1cfca3c79896ff79842f057ea13e529b66af636/queries/highlights.scm
+
+[
+  "("
+  ")"
+  "(?"
+  "(?:"
+  "(?<"
+  ">"
+  "["
+  "]"
+  "{"
+  "}"
+] @punctuation.bracket
+
+[
+  "*"
+  "+"
+  "|"
+  "="
+  "<="
+  "!"
+  "<!"
+  "?"
+] @operator
+
+[
+  (identity_escape)
+  (control_letter_escape)
+  (character_class_escape)
+  (control_escape)
+  (start_assertion)
+  (end_assertion)
+  (boundary_assertion)
+  (non_boundary_assertion)
+] @constant.character.escape
+
+(group_name) @property
+
+(count_quantifier
+  [
+    (decimal_digits) @constant.numeric
+    "," @punctuation.delimiter
+  ])
+
+(character_class
+  [
+    "^" @operator
+    (class_range "-" @operator)
+  ])
+
+(class_character) @constant.character
+(pattern_character) @string