Page Operations
Browse Space
This is the formal ABNF
grammar for the current version of SDL. While this page is mainly for developers, if you have a question about a part of SDL, it may be answered here.
Note: LETTER, as it is used here, refers to the definition of Letter found in the W3C XML Recommendation. The first version of the C++ port, as it stands currently, will not conform to this perfectly, although it should accept all Unicode letters. Also, multiline comments are not supported in this version of the grammar.
; Technically, LF and CRLF are the only widely seen forms, but it's easy to add support for CR, so... NEWLINE = CR / LF / CRLF UTF8CHAR = <any UTF-8 character> STRINGCHAR = <any UTF-8 character, besides anything that is escaped> line-comment = ("//" / "#" / "--") UTF8CHAR NEWLINE line-start = *WSP tag-space = SP / ("\" NEWLINE line-start) line-end = *WSP (line-comment / NEWLINE) identifier = (LETTER / "_") *(LETTER / DIGIT / "_" / "$" / "." / "-") name = identifier [":" identifier] escape-sequence = "\" ("n" / "r" / "t" / "\" / DQUOTE / NEWLINE) double-quote-string = DQUOTE *(escape-sequence / STRINGCHAR) DQUOTE backquote-string = "`" *UTF8CHAR "`" character = "'" UTF8CHAR "'" integer = 1*DIGIT long-integer = integer ( "L" / "l" ) float = integer "." integer ( "F" / "f" ) double = integer "." integer [ "D" / "d" ] decimal = integer "." integer ( "BD" / "bd" ) boolean = "true" / "false" / "on" / "off" date = 4DIGIT "/" 2DIGIT "/" 2DIGIT date-time = date 2DIGIT ":" 2DIGIT [":" 2DIGIT ["." 1*3DIGIT]]["-" 3ALPHA] time-span = [DIGIT ":"] 2DIGIT ":" 2DIGIT ":" 2DIGIT ["." 1*3DIGIT] binary = "[" *(ALPHA / "/" / "+") [1*2"="] "]" null = "null" literal = double-quote-string / backquote-string / character / integer / long-integer / float / double / decimal / boolean / date / date-time / time-span / binary / null attribute = name "=" literal tag-children = "{" line-end *(tag / anonymous-tag) "}" tag = name *(tag-space literal) *(tag-space attribute) [tag-space] tag-children / line-end anonymous-tag = 1*(literal tag-space) *(attribute tag-space) tag-children / line-end document = *(tag / anonymous-tag)