add languages `r` and `rmarkdown` (#1998)

* add languages `r` and `rmarkdown`

* r: fix highlights

* rmarkdown: add eof in queries

* rmarkdown: update lang-support.md

* r: fix highlight query precedence

7 files changed, 169 insertions, 0 deletions

diff --git a/book/src/generated/lang-support.md b/book/src/generated/lang-support.md
index b71349f3..e8bb65e4 100644
--- a/book/src/generated/lang-support.md
+++ b/book/src/generated/lang-support.md
@@ -50,9 +50,11 @@
 | prolog |  |  |  | `swipl` |
 | protobuf | ✓ |  | ✓ |  |
 | python | ✓ | ✓ | ✓ | `pylsp` |
+| r | ✓ |  |  | `R` |
 | racket |  |  |  | `racket` |
 | regex | ✓ |  |  |  |
 | rescript | ✓ | ✓ |  | `rescript-language-server` |
+| rmarkdown | ✓ |  | ✓ | `R` |
 | ron | ✓ |  | ✓ |  |
 | ruby | ✓ |  | ✓ | `solargraph` |
 | rust | ✓ | ✓ | ✓ | `rust-analyzer` |
diff --git a/languages.toml b/languages.toml
index d81d0373..2c6f0c9a 100644
--- a/languages.toml
+++ b/languages.toml
@@ -1038,3 +1038,28 @@ roots = []
 comment-token = "//"
 indent = { tab-width = 4, unit = "    " }
 grammar = "rust"
+
+[[language]]
+name = "r"
+scope = "source.r"
+injection-regex = "(r|R)"
+file-types = ["r", "R"]
+shebangs = ["r", "R"]
+roots = []
+comment-token = "#"
+indent = { tab-width = 2, unit = "  " }
+language-server = { command = "R", args = ["--slave", "-e", "languageserver::run()"] }
+
+[[grammar]]
+name = "r"
+source = { git = "https://github.com/r-lib/tree-sitter-r", rev = "cc04302e1bff76fa02e129f332f44636813b0c3c" }
+
+[[language]]
+name = "rmarkdown"
+scope = "source.rmd"
+injection-regex = "(r|R)md"
+file-types = ["rmd", "Rmd"]
+roots = []
+indent = { tab-width = 2, unit = "  " }
+grammar = "markdown"
+language-server = { command = "R", args = ["--slave", "-e", "languageserver::run()"] }
diff --git a/runtime/queries/r/highlights.scm b/runtime/queries/r/highlights.scm
new file mode 100644
index 00000000..4b931a05
--- /dev/null
+++ b/runtime/queries/r/highlights.scm
@@ -0,0 +1,128 @@
+; highlights.scm
+
+
+; Literals
+
+(integer) @constant.numeric.integer
+
+(float) @constant.numeric.float
+
+(complex) @constant.numeric.integer
+
+(string) @string
+(string (escape_sequence) @constant.character.escape)
+
+(comment) @comment
+
+(formal_parameters (identifier) @variable.parameter)
+(formal_parameters (default_parameter (identifier) @variable.parameter))
+
+; Operators
+[
+ "="
+ "<-"
+ "<<-"
+ "->>"
+ "->"
+] @operator
+
+(unary operator: [
+  "-"
+  "+"
+  "!"
+  "~"
+] @operator)
+
+(binary operator: [
+  "-"
+  "+"
+  "*"
+  "/"
+  "^"
+  "<"
+  ">"
+  "<="
+  ">="
+  "=="
+  "!="
+  "||"
+  "|"
+  "&&"
+  "&"
+  ":"
+  "~"
+] @operator)
+
+[
+  "|>"
+  (special)
+] @operator
+
+(lambda_function "\\" @operator)
+
+[
+ "("
+ ")"
+ "["
+ "]"
+ "{"
+ "}"
+] @punctuation.bracket
+
+(dollar "$" @operator)
+
+(subset2
+ [
+  "[["
+  "]]"
+ ] @punctuation.bracket)
+
+[
+ "in"
+ (dots)
+ (break)
+ (next)
+ (inf)
+] @keyword
+
+[
+  (nan)
+  (na)
+  (null)
+] @type.builtin
+
+[
+  "if"
+  "else"
+  "switch"
+] @keyword.control.conditional
+
+[
+  "while"
+  "repeat"
+  "for"
+] @keyword.control.repeat
+
+[
+  (true)
+  (false)
+] @constant.builtin.boolean
+
+"function" @keyword.function
+
+(call function: (identifier) @function)
+(default_argument name: (identifier) @variable.parameter)
+
+
+(namespace_get namespace: (identifier) @namespace
+ "::" @operator)
+(namespace_get_internal namespace: (identifier) @namespace
+ ":::" @operator)
+
+(namespace_get function: (identifier) @function.method)
+(namespace_get_internal function: (identifier) @function.method)
+
+(identifier) @variable
+
+; Error
+(ERROR) @error
diff --git a/runtime/queries/r/locals.scm b/runtime/queries/r/locals.scm
new file mode 100644
index 00000000..be6cc637
--- /dev/null
+++ b/runtime/queries/r/locals.scm
@@ -0,0 +1,11 @@
+; locals.scm
+
+(function_definition) @local.scope
+
+(formal_parameters (identifier) @local.definition)
+
+(left_assignment name: (identifier) @local.definition)
+(equals_assignment name: (identifier) @local.definition)
+(right_assignment name: (identifier) @local.definition)
+
+(identifier) @local.reference
diff --git a/runtime/queries/rmarkdown/highlights.scm b/runtime/queries/rmarkdown/highlights.scm
new file mode 100644
index 00000000..a3a30e34
--- /dev/null
+++ b/runtime/queries/rmarkdown/highlights.scm
@@ -0,0 +1 @@
+; inherits: markdown
diff --git a/runtime/queries/rmarkdown/indents.scm b/runtime/queries/rmarkdown/indents.scm
new file mode 100644
index 00000000..a3a30e34
--- /dev/null
+++ b/runtime/queries/rmarkdown/indents.scm
@@ -0,0 +1 @@
+; inherits: markdown
diff --git a/runtime/queries/rmarkdown/injections.scm b/runtime/queries/rmarkdown/injections.scm
new file mode 100644
index 00000000..a3a30e34
--- /dev/null
+++ b/runtime/queries/rmarkdown/injections.scm
@@ -0,0 +1 @@
+; inherits: markdown