test

ONC+ 開発ガイド

字句解析ノート

  1. コメントは、/* と */ で囲む

  2. 空白は項目と項目の区切りに使用し、意味を持たない

  3. 識別子は英字で始まり、英字、数字、下線 (_) を含むことができる。識別子では、大文字と小文字を区別する

  4. 任意の桁数の 10 進数を定数といい、始めに負符号 (-)を付けることができる

    例 C-1 XDR 仕様

    Syntax Information
declaration:
	type-specifier identifier
	| type-specifier identifier "[" value "]"
	| type-specifier identifier "<" [ value ] ">"
	| "opaque" identifier "[" value "]"
	| "opaque" identifier "<" [ value ] ">"
	| "string" identifier "<" [ value ] ">"
	| type-specifier "*" identifier
	| "void"
 
value:
	constant
	| identifier
 
type-specifier:
	 [ "unsigned" ] "int"
	| [ "unsigned" ] "hyper"
	| "float"
	| "double"
	| "quadruple"
	| "bool"
	| enum-type-spec
	| struct-type-spec
	| union-type-spec
	| identifier
 
enum-type-spec:
	"enum" enum-body
 
enum-body:
	"{"
	( identifier "=" value )
	( "," identifier "=" value )*
	"}"
 
struct-type-spec:
	"struct" struct-body
 
struct-body:
	"{"
	( declaration ";" )
	( declaration ";" )*
	"}"
 
 union-type-spec:
	"union" union-body
 
union-body:
	"switch" "(" declaration ")" "{"
	( "case" value ":" declaration ";" )
	( "case" value ":" declaration ";" )*
	[ "default" ":" declaration ";" ]
	"}"
 
constant-def:
	"const" identifier "=" constant ";"
 
type-def:
	"typedef" declaration ";"
	| "enum" identifier enum-body ";"
	| "struct" identifier struct-body ";"
	| "union" identifier union-body ";"
 
definition:
	type-def
	| constant-def
 
specification:
	definition *