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path: root/cli/doc/language.txt
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Token types:
      keyword
      identifier
      punctuation       (";" "{" "}" "(" ")" "," "|" "=" ":")
      cxx-path-literal  ("c++:path", <c++:path>, "path", <path>)
      cli-path-literal  ("cli:path", <cli:path>, "path.cli", <path.cli>)
      char-literal
      string-literal
      bool-literal
      int-literal
      float-literal
      call-expr        (e.g., (a, 2))
      template-expr    (e.g., <a, 2>)
      end-of-stream

def-unit:
	include-decl-seq(opt) decl-seq(opt)

include-decl-seq:
        source-decl
	include-decl
	include-decl-seq include-decl

source-decl:
	"source" cli-path-literal ";"

include-decl:
	"include" include-path ";"

include-path:
	cxx-path-literal
	cli-path-literal

decl-seq:
	decl
	decl-seq decl

decl:
        source-decl
        scope-doc
	namespace-def
	class-def

scope-doc:
        string-literal
	"{" doc-string-seq "}"

namespace-def:
	"namespace" identifier "{" namespace-body "}"

namespace-body:
	decl-seq(opt)

class-def:
	"class" identifier inheritance-spec(opt) abstract-spec(opt) "{" class-decl-seq(opt) "};"

inheritance-spec:
	":" base-seq

base-seq:
	qualified-name
	base-seq "," qualified-name

abstract-spec:
        "=" "0"

class-decl-seq:
	class-decl
        class-decl-seq class-decl

class-decl
        scope-doc
	option-def

option-def:
	type-spec option-name-seq initializer(opt) option-def-trailer

type-spec:
	fundamental-type-spec
	qualified-name

option-name-seq:
	option-name
	option-name-seq "|" option-name

option-name:
	option-identifier
	string-literal

initializer:
	"=" initializer-expr
        call-expr

initializer-expr:
	bool-literal
	int-literal
	float-literal
        char-literal
	string-literal
	qualified-name
        call-expr

option-def-trailer:
        ";"
        option-doc

option-doc:
	"{" doc-string-seq "}"

doc-string-seq:
	string-literal
	doc-string-seq "," string-literal

qualified-name:
	"::" qualified-name-trailer
	qualified-name-trailer

qualified-name-trailer:
	template-id
	qualified-name "::" template-id	

template-id:
	identifier template-expr(opt)

fundamental-type-spec:
	"bool"
	 ...
	"long double"