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use std::str::FromStr;
use std::collections::BTreeMap;
use property::Property;
use parser::Parser;
use error::*;
#[derive(Clone, Debug)]
pub struct Component {
/// The name of the component, such as `VCARD` or `VEVENT`.
pub name: String,
/// The component's properties.
pub props: BTreeMap<String, Vec<Property>>,
/// The component's child- or sub-components.
pub subcomponents: Vec<Component>
}
impl Component {
pub fn new<N: Into<String>>(name: N) -> Component {
Component {
name: name.into(),
props: BTreeMap::new(),
subcomponents: vec![]
}
}
/// Append the given property, preserve other same-named properties.
pub fn push(&mut self, prop: Property) {
self.props.entry(prop.name.clone()).or_insert_with(Vec::new).push(prop);
}
/// Set the given property, remove other same-named properties.
pub fn set(&mut self, prop: Property) {
self.props.insert(prop.name.clone(), vec![prop]);
}
/// Retrieve one property by key. Returns `None` if not exactly one property was found.
pub fn get_only<P: AsRef<str>>(&self, name: P) -> Option<&Property> {
match self.props.get(name.as_ref()) {
Some(x) if x.len() == 1 => Some(&x[0]),
_ => None
}
}
/// Retrieve properties by key. Returns an empty slice if key doesn't exist.
pub fn get_all<P: AsRef<str>>(&self, name: P) -> &[Property] {
static EMPTY: &'static [Property] = &[];
match self.props.get(name.as_ref()) {
Some(values) => &values[..],
None => EMPTY
}
}
/// Remove a single property.
pub fn pop<P: AsRef<str>>(&mut self, name: P) -> Option<Property> {
match self.props.get_mut(name.as_ref()) {
Some(values) => values.pop(),
None => None
}
}
/// Remove all properties
pub fn remove<P: AsRef<str>>(&mut self, name: P) -> Option<Vec<Property>> {
self.props.remove(name.as_ref())
}
}
impl FromStr for Component {
type Err = VObjectErrorKind;
/// Same as `vobject::parse_component`
fn from_str(s: &str) -> Result<Component> {
parse_component(s)
}
}
/// Parse exactly one component. Trailing data generates errors.
pub fn parse_component(s: &str) -> Result<Component> {
let (rv, new_s) = read_component(s)?;
if !new_s.is_empty() {
let s = format!("Trailing data: `{}`", new_s);
return Err(VObjectErrorKind::ParserError(s));
}
Ok(rv)
}
/// Parse one component and return the rest of the string.
pub fn read_component(s: &str) -> Result<(Component, &str)> {
let mut parser = Parser::new(s);
let rv = parser.consume_component()?;
let new_s = if parser.eof() {
""
} else {
&parser.input[parser.pos..]
};
Ok((rv, new_s))
}
/// Write a component to a String.
pub fn write_component(c: &Component) -> String {
fn inner(buf: &mut String, c: &Component) {
buf.push_str("BEGIN:");
buf.push_str(&c.name);
buf.push_str("\r\n");
for (prop_name, props) in &c.props {
for prop in props.iter() {
if let Some(ref x) = prop.prop_group {
buf.push_str(&x);
buf.push('.');
};
buf.push_str(&prop_name);
for (param_key, param_value) in &prop.params {
buf.push(';');
buf.push_str(¶m_key);
buf.push('=');
buf.push_str(¶m_value);
}
buf.push(':');
buf.push_str(&fold_line(&prop.raw_value));
buf.push_str("\r\n");
}
}
for subcomponent in &c.subcomponents {
inner(buf, subcomponent);
}
buf.push_str("END:");
buf.push_str(&c.name);
buf.push_str("\r\n");
}
let mut buf = String::new();
inner(&mut buf, c);
buf
}
/// Fold contentline to 75 bytes or less. This function assumes the input
/// to be unfolded, which means no '\n' or '\r' in it.
pub fn fold_line(line: &str) -> String {
let limit = 75;
let len = line.len();
let mut bytes_remaining = len;
let mut ret = String::with_capacity(len + (len / limit * 3));
let mut pos = 0;
let mut next_pos = limit;
while bytes_remaining > limit {
while line.is_char_boundary(next_pos) == false {
next_pos -= 1;
}
ret.push_str(&line[pos..next_pos]);
ret.push_str("\r\n ");
bytes_remaining -= next_pos - pos;
pos = next_pos;
next_pos += limit;
}
ret.push_str(&line[len - bytes_remaining..]);
ret
}
#[cfg(test)]
mod tests {
use component::fold_line;
#[test]
fn test_fold() {
let line = "This should be multiple lines and fold on char boundaries. 毎害止\
加食下組多地将写館来局必第。東証細再記得玲祉込吉宣会法授";
let expected = "This should be multiple lines and fold on char boundaries. 毎害止\
加食\r\n 下組多地将写館来局必第。東証細再記得玲祉込吉宣会法\r\n 授";
assert_eq!(expected, fold_line(line));
assert_eq!("ab", fold_line("ab"));
}
}
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