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|
use vec1::{Vec1, Size0Error};
use internals::grammar::encoded_word::EncodedWordContext;
use internals::error::EncodingError;
use internals::encoder::{EncodingWriter, EncodableInHeader};
use ::{HeaderTryFrom, HeaderTryInto};
use ::error::ComponentCreationError;
use ::data::Input;
use super::utils::text_partition::{ Partition, partition };
use super::word::{ Word, do_encode_word };
use super::{ CFWS, FWS };
/// Represent a "phrase" as it for example is used in the `Mailbox` type for the display name.
///
/// It is recommended to use the [`Phrase.new()`] constructor, which creates the right phrase
/// for your input.
///
/// **Warning: Details of this type, expect `Phrase::new` and `Phrase::try_from`, are likely to
/// change with some of the coming braking changes.** If you just create it using `try_from`
/// or `new` changes should not affect you, but if you create it from a vec of `Word`'s things
/// might be different.
#[derive( Debug, Clone, Eq, PartialEq, Hash )]
pub struct Phrase(
//FIXME hide this away or at last turn it into a struct field, with next braking change.
/// The "words" the phrase consist of. Be aware that this are words in the sense of the
/// mail grammar so it can be a complete quoted string. Also be aware that in the mail
/// grammar "words" _contain the whitespace around them_ (to some degree). So if you
/// just have a sequence of "human words" turned into word instances there will be
/// no whitespace between the words. (From the point of the mail grammar a words do not
/// have to have any boundaries between each other even if this leads to ambiguity)
pub Vec1<Word> );
impl Phrase {
/// Creates a `Phrase` instance from some arbitrary input.
///
/// This method can be used with both `&str` and `String`.
///
/// # Error
///
/// There are only two cases in which this can fail:
///
/// 1. If the input is empty (a phrase can not be empty).
/// 2. If the input contained a illegal us-ascii character (any char which is
/// not "visible" and not `' '` or `\t` like e.g. CTRL chars `'\0'` but also
/// `'\r'` and `'\n'`). While we could encode them with encoded words, it's
/// not really meant to be used this way and this chars will likely either be
/// stripped out by a mail client or might cause display bugs.
pub fn new<T: HeaderTryInto<Input>>(input: T) -> Result<Self, ComponentCreationError> {
//TODO it would make much more sense if Input::shared could be taken advantage of
let input = input.try_into()?;
//OPTIMIZE: words => shared, then turn partition into shares, too
let mut last_gap = None;
let mut words = Vec::new();
let partitions = partition( input.as_str() )
.map_err(|err| ComponentCreationError
::from_parent(err, "Phrase")
.with_str_context(input.as_str())
)?;
for partition in partitions.into_iter() {
match partition {
Partition::VCHAR( word ) => {
let mut word = Word::try_from( word )?;
if let Some( fws ) = last_gap.take() {
word.pad_left( fws );
}
words.push( word );
},
Partition::SPACE( _gap ) => {
//FIMXE currently collapses WS (This will leave at last one WS!)
last_gap = Some( CFWS::SingleFws( FWS ) )
}
}
}
let mut words = Vec1::from_vec(words)
.map_err( |_| ComponentCreationError
::from_parent(Size0Error, "Phrase")
.with_str_context(input.as_str())
)?;
if let Some( right_padding ) = last_gap {
words.last_mut().pad_right( right_padding );
}
Ok( Phrase( words ) )
}
}
impl<'a> HeaderTryFrom<&'a str> for Phrase {
fn try_from(input: &'a str) -> Result<Self, ComponentCreationError> {
Phrase::new(input)
}
}
impl HeaderTryFrom<String> for Phrase {
fn try_from(input: String) -> Result<Self, ComponentCreationError> {
Phrase::new(input)
}
}
impl HeaderTryFrom<Input> for Phrase {
fn try_from(input: Input) -> Result<Self, ComponentCreationError> {
Phrase::new(input)
}
}
impl EncodableInHeader for Phrase {
//FEATURE_TODO(warn_on_bad_phrase): warn if the phrase contains chars it should not
// but can contain due to encoding, e.g. ascii CTL's
fn encode(&self, heandle: &mut EncodingWriter) -> Result<(), EncodingError> {
for word in self.0.iter() {
do_encode_word( &*word, heandle, Some( EncodedWordContext::Phrase ) )?;
}
Ok( () )
}
fn boxed_clone(&self) -> Box<EncodableInHeader> {
Box::new(self.clone())
}
}
#[cfg(test)]
mod test {
use ::HeaderTryFrom;
use super::Phrase;
ec_test!{ simple, {
Phrase::try_from("simple think")?
} => ascii => [
Text "simple",
MarkFWS,
Text " think"
]}
ec_test!{ with_encoding, {
Phrase::try_from(" hm nääds encoding")?
} => ascii => [
MarkFWS,
Text " hm",
MarkFWS,
Text " =?utf8?Q?n=C3=A4=C3=A4ds?=",
MarkFWS,
Text " encoding"
]}
}
|
