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use std::borrow::Cow;
use std::collections::BTreeSet;
/// Type that holds a number of variables of type `T`
pub trait VariableHolder<T> {
fn get_variables(&self) -> BTreeSet<T>;
}
/// Type that holds a number of style variables of type `T`
pub trait StyleVariableHolder<T> {
fn get_style_variables(&self) -> BTreeSet<T>;
}
#[derive(Clone)]
pub struct TextGroup<'a> {
pub format: Vec<FormatElement<'a>>,
pub style: Vec<StyleElement<'a>>,
}
#[derive(Clone)]
pub enum FormatElement<'a> {
Text(Cow<'a, str>),
Variable(Cow<'a, str>),
TextGroup(TextGroup<'a>),
Conditional(Vec<FormatElement<'a>>),
}
#[derive(Clone)]
pub enum StyleElement<'a> {
Text(Cow<'a, str>),
Variable(Cow<'a, str>),
}
impl<'a> VariableHolder<Cow<'a, str>> for FormatElement<'a> {
fn get_variables(&self) -> BTreeSet<Cow<'a, str>> {
match self {
FormatElement::Variable(var) => {
let mut variables = BTreeSet::new();
variables.insert(var.clone());
variables
}
FormatElement::TextGroup(textgroup) => textgroup.format.get_variables(),
FormatElement::Conditional(format) => format.get_variables(),
_ => Default::default(),
}
}
}
impl<'a> VariableHolder<Cow<'a, str>> for Vec<FormatElement<'a>> {
fn get_variables(&self) -> BTreeSet<Cow<'a, str>> {
self.iter().fold(BTreeSet::new(), |mut acc, el| {
acc.extend(el.get_variables());
acc
})
}
}
impl<'a> VariableHolder<Cow<'a, str>> for &[FormatElement<'a>] {
fn get_variables(&self) -> BTreeSet<Cow<'a, str>> {
self.iter().fold(BTreeSet::new(), |mut acc, el| {
acc.extend(el.get_variables());
acc
})
}
}
impl<'a> StyleVariableHolder<Cow<'a, str>> for StyleElement<'a> {
fn get_style_variables(&self) -> BTreeSet<Cow<'a, str>> {
match self {
StyleElement::Variable(var) => {
let mut variables = BTreeSet::new();
variables.insert(var.clone());
variables
}
_ => Default::default(),
}
}
}
impl<'a> StyleVariableHolder<Cow<'a, str>> for Vec<StyleElement<'a>> {
fn get_style_variables(&self) -> BTreeSet<Cow<'a, str>> {
self.iter().fold(BTreeSet::new(), |mut acc, el| {
acc.extend(el.get_style_variables());
acc
})
}
}
impl<'a> StyleVariableHolder<Cow<'a, str>> for Vec<FormatElement<'a>> {
fn get_style_variables(&self) -> BTreeSet<Cow<'a, str>> {
self.iter().fold(BTreeSet::new(), |mut acc, el| match el {
FormatElement::TextGroup(textgroup) => {
acc.extend(textgroup.style.get_style_variables());
acc.extend(textgroup.format.get_style_variables());
acc
}
FormatElement::Conditional(format) => {
acc.extend(format.get_style_variables());
acc
}
_ => acc,
})
}
}
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