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103 lines
2.9 KiB
103 lines
2.9 KiB
use std::error::Error;
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use std::fmt;
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use symbols::Symbol;
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pub struct Hook<A, B> where A: Symbol, B: Symbol {
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a: A,
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b: B
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}
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impl<A, B> Hook<A, B> where A: Symbol, B: Symbol {
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pub fn new(a: A, b: B) -> Self {
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Hook { a: a, b: b }
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}
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}
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impl<A, B> Symbol for Hook<A, B> where A: Symbol, B: Symbol {
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fn target_reached(&self) -> Result<bool, Box<Error>> {
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self.a.target_reached().and_then(|reached| if reached { self.b.target_reached() } else { Ok(reached) })
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}
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fn execute(&self) -> Result<(), Box<Error>> {
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try!(self.a.execute());
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self.b.execute()
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}
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}
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impl<A, B> fmt::Display for Hook<A, B> where A: Symbol, B: Symbol {
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fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error>{
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write!(f, "Hook {} and then {}", self.a, self.b)
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}
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}
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#[cfg(test)]
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mod test {
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use std::error::Error;
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use std::fmt;
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use symbols::Symbol;
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use symbols::hook::Hook;
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struct ErrSymbol(String);
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impl Symbol for ErrSymbol {
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fn target_reached(&self) -> Result<bool, Box<Error>> { Err(self.0.clone().into()) }
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fn execute(&self) -> Result<(), Box<Error>> { Err(self.0.clone().into()) }
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}
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impl fmt::Display for ErrSymbol { fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error>{ write!(f, "") } }
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struct OkSymbol(bool);
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impl Symbol for OkSymbol {
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fn target_reached(&self) -> Result<bool, Box<Error>> { Ok(self.0) }
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fn execute(&self) -> Result<(), Box<Error>> { Ok(()) }
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}
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impl fmt::Display for OkSymbol { fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error>{ write!(f, "") } }
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#[test]
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fn first_target_reached_fails() {
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let res = Hook::new(ErrSymbol("first".into()), ErrSymbol("second".into())).target_reached();
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assert_eq!(res.unwrap_err().description(), "first");
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}
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#[test]
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fn first_target_not_reached() {
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let res = Hook::new(OkSymbol(false), ErrSymbol("second".into())).target_reached();
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assert_eq!(res.unwrap(), false);
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}
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#[test]
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fn second_target_reached_fails() {
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let res = Hook::new(OkSymbol(true), ErrSymbol("second".into())).target_reached();
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assert_eq!(res.unwrap_err().description(), "second");
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}
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#[test]
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fn second_target_not_reached() {
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let res = Hook::new(OkSymbol(true), OkSymbol(false)).target_reached();
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assert_eq!(res.unwrap(), false);
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}
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#[test]
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fn everything_reached() {
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let res = Hook::new(OkSymbol(true), OkSymbol(true)).target_reached();
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assert_eq!(res.unwrap(), true);
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}
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#[test]
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fn first_execute_fails() {
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let res = Hook::new(ErrSymbol("first".into()), ErrSymbol("second".into())).execute();
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assert_eq!(res.unwrap_err().description(), "first");
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}
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#[test]
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fn second_execute_fails() {
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let res = Hook::new(OkSymbol(true), ErrSymbol("second".into())).execute();
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assert_eq!(res.unwrap_err().description(), "second");
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}
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#[test]
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fn everything_executes() {
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let res = Hook::new(OkSymbol(true), OkSymbol(true)).execute();
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assert_eq!(res.unwrap(), ());
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}
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}
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