Module grammar

This module contains a number of helper functions for writing parsers.

Ironically they are also needed when writing mail encoders/generators e.g. for checking if a part need special encoding.

Modules

encoded_word

Grammar parts for encoded words (based on RFC 2047).

Functions

is_any_whitespace

any whitespace (char::is_whitespace)

is_ascii

True if ch is us-ascii (i.e. <128)

is_ascii_vchar

True if ch is ascii and “visible”/“printable”.

is_atext

atext as defined by RFC 5322

is_ctext

ctext as defined by RFC 5322

is_ctl

Chack if it is a CTL char (based on RFC 822).

is_dtext

dtext as defined by RFC 5322

is_especial

Check if a char is especial (based on RFC …).

is_ftext

ftext as defined by RFC 5322

is_qtext

qtext as defined by RFC 5322

is_quotable

can be quoted in a quoted string (internalized) based on RFC … and RFC …

is_quoted_string

True if the given string is a quoted string.

is_space

True if ch is ' '

is_special

check if a char is a especial (based on RFC 5322)

is_token

Check if a string is an token (based on RFC …).

is_token_char

Check if a char is an token char (based on RFC 2045).

is_tspecial

check if a char is an tspecial (based on RFC 2045)

is_vchar

VCHAR as defined by RFC 5243

is_ws

WS as defined by RFC 5234