Improve dart indent (#3419)

languages.toml

@@ -923,7 +923,7 @@ indent = { tab-width = 2, unit = "  " }
 
 [[grammar]]
 name = "dart"
-source = { git = "https://github.com/UserNobody14/tree-sitter-dart", rev = "6a25376685d1d47968c2cef06d4db8d84a70025e" }
+source = { git = "https://github.com/UserNobody14/tree-sitter-dart", rev = "2d7f66651c9319c1a0e4dda226cc2628fbb66528" }
 
 [[language]]
 name = "scala"

runtime/queries/dart/indents.scm

@@ -1,16 +1,95 @@
+; things surrounded by ({[]})
 [
-  (class_body)
-  (function_body)
-  (function_expression_body)
-  (declaration)
-  (initializers)
-  (switch_block)
-  (if_statement)
-  (formal_parameter_list)
-  (formal_parameter)
+  (template_substitution)
   (list_literal)
-  (return_statement)
+  (set_or_map_literal)
+  (parenthesized_expression)
   (arguments)
+  (index_selector)
+  (block)
+  (assertion_arguments)
+  (switch_block)
+  (catch_parameters)
+  (for_loop_parts)
+  (configuration_uri_condition)
+  (enum_body)
+  (class_body)
+  (extension_body)
+  (parameter_type_list)
+  (optional_positional_parameter_types)
+  (named_parameter_types)
+  (formal_parameter_list)
+  (optional_formal_parameters)
+] @indent
+
+; control flow statement which accept one line as body
+
+(for_statement
+  body: _ @indent
+  (#not-kind-eq? @indent block)
+  (#set! "scope" "all")
+)
+
+(while_statement
+  body: _ @indent
+  (#not-kind-eq? @indent block)
+  (#set! "scope" "all")
+)
+
+(do_statement
+  body: _ @indent
+  (#not-kind-eq? @indent block)
+  (#set! "scope" "all")
+)
+
+(if_statement
+  consequence: _ @indent
+  (#not-kind-eq? @indent block)
+  (#set! "scope" "all")
+)
+(if_statement
+  alternative: _ @indent
+  (#not-kind-eq? @indent if_statement)
+  (#not-kind-eq? @indent block)
+  (#set! "scope" "all")
+)
+(if_statement
+  "else" @else
+  alternative: (if_statement) @indent
+  (#not-same-line? @indent @else)
+  (#set! "scope" "all")
+)
+
+(if_element
+  consequence: _ @indent
+  (#set! "scope" "all")
+)
+(if_element
+  alternative: _ @indent
+  (#not-kind-eq? @indent if_element)
+  (#set! "scope" "all")
+)
+(if_element
+  "else" @else
+  alternative: (if_element) @indent
+  (#not-same-line? @indent @else)
+  (#set! "scope" "all")
+)
+
+(for_element
+  body: _ @indent
+  (#set! "scope" "all")
+)
+
+; simple statements
+[
+  (local_variable_declaration)
+  (break_statement)
+  (continue_statement)
+  (return_statement)
+  (yield_statement)
+  (yield_each_statement)
+  (expression_statement)
 ] @indent
 
 [
@@ -18,3 +97,4 @@
   "]"
   ")"
 ] @outdent
+