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187 lines
5.0 KiB
187 lines
5.0 KiB
use std::error::Error;
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use std::fmt;
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use loggers::Logger;
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use symbols::Symbol;
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#[derive(Debug)]
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pub enum SymbolRunError {
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Symbol(Box<Error>),
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ExecuteDidNotReach(())
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}
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impl Error for SymbolRunError {
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fn description(&self) -> &str {
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match self {
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&SymbolRunError::Symbol(_) => "Symbol execution error",
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&SymbolRunError::ExecuteDidNotReach(_) => "Target not reached after executing symbol"
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}
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}
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fn cause(&self) -> Option<&Error> {
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match self {
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&SymbolRunError::Symbol(ref e) => Some(&**e),
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&SymbolRunError::ExecuteDidNotReach(_) => None
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}
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}
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}
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impl fmt::Display for SymbolRunError {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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match self {
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&SymbolRunError::Symbol(ref e) => write!(f, "{}", e),
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&SymbolRunError::ExecuteDidNotReach(_) => write!(f, "{}", self.description())
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}
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}
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}
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pub trait SymbolRunner {
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fn run_symbol<S: ?Sized + Symbol + fmt::Display>(&self, logger: &mut Logger, symbol: &S) -> Result<(), Box<Error>>;
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}
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pub struct InitializingSymbolRunner;
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impl SymbolRunner for InitializingSymbolRunner {
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fn run_symbol<S: ?Sized + Symbol + fmt::Display>(&self, logger: &mut Logger, symbol: &S) -> Result<(), Box<Error>>
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{
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let target_reached = try!(symbol.target_reached());
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if target_reached {
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logger.write(format!("{} already reached", symbol).as_str());
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} else {
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logger.debug(format!("Symbol reports target_reached: {:?}", target_reached).as_str());
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logger.write(format!("Executing {}", symbol).as_str());
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try!(symbol.execute());
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let target_reached = try!(symbol.target_reached());
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logger.debug(format!("Symbol reports target_reached: {:?} (should be true)", target_reached).as_str());
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if !target_reached {
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return Err(Box::new(SymbolRunError::ExecuteDidNotReach(())));
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}
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}
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Ok(())
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}
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}
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pub struct DrySymbolRunner;
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impl SymbolRunner for DrySymbolRunner {
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fn run_symbol<S: ?Sized + Symbol + fmt::Display>(&self, logger: &mut Logger, symbol: &S) -> Result<(), Box<Error>>
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{
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let target_reached = try!(symbol.target_reached());
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logger.debug(format!("Symbol reports target_reached: {:?}", target_reached).as_str());
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if !target_reached {
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logger.write(format!("Would execute {}", symbol).as_str());
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}
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Ok(())
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}
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}
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// FIXME: Add ExpectingSymbolRunner
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#[cfg(test)]
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mod test {
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use std::cell::RefCell;
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use std::error::Error;
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use std::fmt;
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use loggers::Logger;
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use symbols::Symbol;
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use schema::SymbolRunner;
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use schema::InitializingSymbolRunner;
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#[derive(Debug, PartialEq, Clone)]
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enum DummySymbolError {
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Error(())
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}
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impl Error for DummySymbolError {
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fn description(&self) -> &str {
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return "Description";
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}
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}
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impl fmt::Display for DummySymbolError {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "Dummy symbol error")
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}
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}
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struct DummySymbol<'a> {
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_execute: &'a Fn() -> Result<(), Box<Error>>,
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_target_reached: &'a Fn() -> Result<bool, Box<Error>>
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}
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impl<'a> Symbol for DummySymbol<'a> {
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fn target_reached(&self) -> Result<bool, Box<Error>> {
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(self._target_reached)()
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}
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fn execute(&self) -> Result<(), Box<Error>> {
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(self._execute)()
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}
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}
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impl<'a> fmt::Display for DummySymbol<'a> {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "Dummy symbol")
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}
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}
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impl<'a> DummySymbol<'a> {
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fn new(target_reached: &'a Fn() -> Result<bool, Box<Error>>, execute: &'a Fn() -> Result<(), Box<Error>>) -> DummySymbol<'a> {
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DummySymbol { _target_reached: target_reached, _execute: execute }
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}
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}
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struct DummyLogger {
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log: Vec<String>
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}
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impl DummyLogger {
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fn new() -> DummyLogger {
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DummyLogger { log: Vec::new() }
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}
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}
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impl Logger for DummyLogger {
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fn write(&mut self, line: &str) {
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self.log.push(From::from(line));
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}
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fn debug(&mut self, line: &str) {
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self.log.push(From::from(line));
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}
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}
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#[test]
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fn nothing_needed_to_be_done() {
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let result = InitializingSymbolRunner.run_symbol( &mut DummyLogger::new(), &DummySymbol::new(&|| Ok(true), &|| Ok(())) );
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assert!(result.is_ok());
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}
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#[test]
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fn everything_is_ok() {
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let first = RefCell::new(true);
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let result = InitializingSymbolRunner.run_symbol( &mut DummyLogger::new(), &DummySymbol::new(&|| {
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let mut _first = first.borrow_mut();
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Ok(if *_first {
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*_first = false;
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true
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} else {
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false
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})
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}, &|| Ok(())) );
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assert!(result.is_ok());
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}
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#[test]
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fn executing_did_not_change_state() {
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let result = InitializingSymbolRunner.run_symbol( &mut DummyLogger::new(), &DummySymbol::new(&|| Ok(false), &|| Ok(())));
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assert_eq!(
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result.unwrap_err().description(),
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"Target not reached after executing symbol"
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);
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}
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#[test]
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fn executing_did_not_work() {
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let err = InitializingSymbolRunner.run_symbol( &mut DummyLogger::new(), &DummySymbol::new(&|| Ok(false), &|| Err(Box::new(DummySymbolError::Error(()))) )).unwrap_err();
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assert_eq!(err.description(), "Description");
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}
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}
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