queries: add C queries

Also add a missing `field` capture in locals query.

CONTRIBUTING.md

@@ -92,6 +92,7 @@ are optional and will not have any effect for now.
   `var`
   `macro`
   `type`
+  `field`
 
 `@scope`
 

queries/c/highlights.scm

@@ -0,0 +1,77 @@
+"break" @keyword
+"case" @conditional
+"const" @keyword
+"continue" @repeat
+"default" @keyword
+"do" @repeat
+"else" @conditional
+"enum" @keyword
+"extern" @keyword
+"for" @repeat
+"if" @conditional
+"inline" @keyword
+"return" @keyword
+"sizeof" @keyword
+"static" @keyword
+"struct" @keyword
+"switch" @keyword
+"typedef" @keyword
+"union" @keyword
+"volatile" @keyword
+"while" @repeat
+
+"#define" @constant.macro
+"#else" @keyword
+"#endif" @keyword
+"#if" @keyword
+"#ifdef" @keyword
+"#ifndef" @keyword
+"#include" @keyword
+(preproc_directive) @keyword
+
+"--" @operator
+"-" @operator
+"-=" @operator
+"->" @operator
+"!=" @operator
+"*" @operator
+"&" @operator
+"&&" @operator
+"+" @operator
+"++" @operator
+"+=" @operator
+"<" @operator
+"==" @operator
+">" @operator
+"||" @operator
+
+"." @delimiter
+";" @delimiter
+
+(string_literal) @string
+(system_lib_string) @string
+
+(null) @constant.builtin
+(number_literal) @number
+(char_literal) @number
+
+(call_expression
+  function: (identifier) @function)
+(call_expression
+  function: (field_expression
+    field: (field_identifier) @function))
+(function_declarator
+  declarator: (identifier) @function)
+(preproc_function_def
+  name: (identifier) @function.macro)
+
+(field_identifier) @property
+(statement_identifier) @label
+(type_identifier) @type
+(primitive_type) @type
+(sized_type_specifier) @type
+
+((identifier) @constant
+ (match? @constant "^[A-Z][A-Z\\d_]+$"))
+
+(comment) @comment

queries/c/locals.scm

@@ -0,0 +1,36 @@
+;; Functions definitions
+(function_declarator
+  declarator: (identifier) @definition.function) @scope
+(preproc_function_def
+  name: (identifier) @definition.macro) @scope
+
+(preproc_def
+  name: (identifier) @definition.macro)
+(pointer_declarator
+  declarator: (identifier) @definition.variable)
+(parameter_declaration
+  declarator: (identifier) @definition.variable)
+(init_declarator
+  declarator: (identifier) @definition.variable)
+(array_declarator
+  declarator: (identifier) @definition.variable)
+(declaration
+  declarator: (identifier) @definition.variable)
+(enum_specifier
+  name: (*) @definition.type
+  (enumerator_list
+    (enumerator name: (identifier) @definition.variable)))
+
+;; Type / Struct / Enum
+(field_declaration
+  declarator: (field_identifier) @definition.field)
+(type_definition
+  declarator: (type_identifier) @definition.type)
+
+;; References
+(identifier) @reference
+
+;; Scope
+(for_statement) @scope
+(if_statement) @scope
+(while_statement) @scope