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use std::fmt;
use Predicate;
#[derive(Copy, Clone, Debug)]
pub struct IsEmptyPredicate {}
impl Predicate<str> for IsEmptyPredicate {
fn eval(&self, variable: &str) -> bool {
variable.is_empty()
}
}
impl fmt::Display for IsEmptyPredicate {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "var.is_empty()")
}
}
pub fn is_empty() -> IsEmptyPredicate {
IsEmptyPredicate {}
}
#[derive(Clone, Debug)]
pub struct StartsWithPredicate {
pattern: String,
}
impl Predicate<str> for StartsWithPredicate {
fn eval(&self, variable: &str) -> bool {
variable.starts_with(&self.pattern)
}
}
impl fmt::Display for StartsWithPredicate {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "var.starts_with({:?})", self.pattern)
}
}
pub fn starts_with<P>(pattern: P) -> StartsWithPredicate
where
P: Into<String>,
{
StartsWithPredicate {
pattern: pattern.into(),
}
}
#[derive(Clone, Debug)]
pub struct EndsWithPredicate {
pattern: String,
}
impl Predicate<str> for EndsWithPredicate {
fn eval(&self, variable: &str) -> bool {
variable.ends_with(&self.pattern)
}
}
impl fmt::Display for EndsWithPredicate {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "var.ends_with({:?})", self.pattern)
}
}
pub fn ends_with<P>(pattern: P) -> EndsWithPredicate
where
P: Into<String>,
{
EndsWithPredicate {
pattern: pattern.into(),
}
}
#[derive(Clone, Debug)]
pub struct ContainsPredicate {
pattern: String,
}
impl ContainsPredicate {
pub fn count(self, count: usize) -> MatchesPredicate {
MatchesPredicate {
pattern: self.pattern,
count,
}
}
}
impl Predicate<str> for ContainsPredicate {
fn eval(&self, variable: &str) -> bool {
variable.contains(&self.pattern)
}
}
impl fmt::Display for ContainsPredicate {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "var.contains({:?})", self.pattern)
}
}
#[derive(Clone, Debug)]
pub struct MatchesPredicate {
pattern: String,
count: usize,
}
impl Predicate<str> for MatchesPredicate {
fn eval(&self, variable: &str) -> bool {
variable.matches(&self.pattern).count() == self.count
}
}
impl fmt::Display for MatchesPredicate {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "var.contains({:?}, {})", self.pattern, self.count)
}
}
pub fn contains<P>(pattern: P) -> ContainsPredicate
where
P: Into<String>,
{
ContainsPredicate {
pattern: pattern.into(),
}
}