iCalendar core DCGs and validators.

Standards

This is an implementation of the RFC 5545:

The following standards are or will be supported in other libraries:

• RFC 5546
• RFC 6868
• RFC 7529 @author Gimenez, Christian @license GPLv3

 iana_token(-Val:codes)//

ABNF: iana-token = 1*(ALPHA / DIGIT / "-")

 x_name(-Token:codes)//

ABNF: x-name = "X-" [vendorid "-"] 1*(ALPHA / DIGIT / "-")

 param_value(-Text:codes)//

ABNF: param-value = paramtext / quoted-string.

 param_name(-Name:codes)//

ABNF: name = iana-token / x-name

 param(-Param:pred)//

ABNF: param = param-name "=" param-value *("," param-value)

Arguments:

Param

- A param/2 predicate: param(Name: codes, Values: list). Values is a list of codes.

 name(-Name:codes)//

ABNF: name = iana-token / x-name

 value(-Val:codes)//

ABNF: value = *VALUE-CHAR

ABNF: VALUE-CHAR = WSP / %x21-7E / NON-US-ASCII

 params(-Params:list)//

ABNF: *(";" param )

Arguments:

Params

- A list of codes.

 content_line(-Content:pred)//

ABNF: contentline = name *(";" param ) ":" value CRLF

Arguments:

Content

- A content/3 predicate: content(Name: codes, Params: list, Val:codes) where Params is a list of codes.