[nihav.git] / nihav-core / src / options.rs

//! Options support.
//!
//! This module contains the definitions for options and names for common options.
//! Options are used to set custom parameters in e.g. decoders or muxers.
//!
//! As a rule target for options should provide a list of supported options and ignore unknown options.

use std::sync::Arc;
use std::fmt;

/// Common name for keyframe interval option.
pub const KEYFRAME_OPTION: &'static str = "key_int";
/// Common description for keyframe interval option.
pub const KEYFRAME_OPTION_DESC: &'static str = "Keyframe interval (0 - automatic)";

/// A list specifying option parsing and validating errors.
#[derive(Clone,Copy,Debug,PartialEq)]
pub enum OptionError {
    /// Input is not intended for the current option definition.
    WrongName,
    /// Option value is not in the expected format.
    InvalidFormat,
    /// Option value was not in the range.
    InvalidValue,
    /// Parse error.
    ParseError,
}

/// A specialised `Result` type for option parsing/validation.
pub type OptionResult<T> = Result<T, OptionError>;

/// Option definition type.
#[derive(Debug)]
pub enum NAOptionDefinitionType {
    /// Option may just be present.
    None,
    /// Option is a boolean value.
    Bool,
    /// Option is an integer with optional minimum and maximum value.
    Int(Option<i64>, Option<i64>),
    /// Option is a floating point number with optional minimum and maximum value.
    Float(Option<f64>, Option<f64>),
    /// Option is a string with an optional list of allowed values.
    String(Option<&'static [&'static str]>),
    /// Option is some binary data.
    Data,
}

/// Option definition.
#[derive(Debug)]
pub struct NAOptionDefinition {
    /// Option name.
    pub name:           &'static str,
    /// Option meaning.
    pub description:    &'static str,
    /// Option type.
    pub opt_type:       NAOptionDefinitionType,
}

impl NAOptionDefinition {
    /// Tries to parse input string(s) as an option and returns new option and number of arguments used (1 or 2) on success.
    pub fn parse(&self, name: &String, value: Option<&String>) -> OptionResult<(NAOption, usize)> {
        let no_name = "no".to_owned() + self.name;
        let opt_no_name = "--no".to_owned() + self.name;
        if name == &no_name || name == &opt_no_name {
            match self.opt_type {
                NAOptionDefinitionType::Bool => return Ok((NAOption { name: self.name, value: NAValue::Bool(false) }, 1)),
                _ => return Err(OptionError::InvalidFormat),
            };
        }
        let opt_name = "--".to_owned() + self.name;
        if self.name != name && &opt_name != name {
            return Err(OptionError::WrongName);
        }
        match self.opt_type {
            NAOptionDefinitionType::None => Ok((NAOption { name: self.name, value: NAValue::None }, 1)),
            NAOptionDefinitionType::Bool => Ok((NAOption { name: self.name, value: NAValue::Bool(true) }, 1)),
            NAOptionDefinitionType::Int(_, _) => {
                if let Some(str) = value {
                    let ret = str.parse::<i64>();
                    if let Ok(val) = ret {
                        let opt = NAOption { name: self.name, value: NAValue::Int(val) };
                        self.check(&opt)?;
                        Ok((opt, 2))
                    } else {
                        Err(OptionError::ParseError)
                    }
                } else {
                    Err(OptionError::ParseError)
                }
            },
            NAOptionDefinitionType::Float(_, _) => {
                if let Some(str) = value {
                    let ret = str.parse::<f64>();
                    if let Ok(val) = ret {
                        let opt = NAOption { name: self.name, value: NAValue::Float(val) };
                        self.check(&opt)?;
                        Ok((opt, 2))
                    } else {
                        Err(OptionError::ParseError)
                    }
                } else {
                    Err(OptionError::ParseError)
                }
            },
            NAOptionDefinitionType::String(_) => {
                if let Some(str) = value {
                    let opt = NAOption { name: self.name, value: NAValue::String(str.to_string()) };
                    self.check(&opt)?;
                    Ok((opt, 2))
                } else {
                    Err(OptionError::ParseError)
                }
            },
            _ => unimplemented!(),
        }
    }
    /// Checks whether input option conforms to the definition i.e. whether it has proper format and it lies in range.
    pub fn check(&self, option: &NAOption) -> OptionResult<()> {
        if option.name != self.name {
            return Err(OptionError::WrongName);
        }
        match option.value {
            NAValue::None => Ok(()),
            NAValue::Bool(_) => Ok(()),
            NAValue::Int(intval) => {
                match self.opt_type {
                    NAOptionDefinitionType::Int(minval, maxval) => {
                        if let Some(minval) = minval {
                            if intval < minval { return Err(OptionError::InvalidValue); }
                        }
                        if let Some(maxval) = maxval {
                            if intval > maxval { return Err(OptionError::InvalidValue); }
                        }
                    },
                    NAOptionDefinitionType::Float(minval, maxval) => {
                        let fval = intval as f64;
                        if let Some(minval) = minval {
                            if fval < minval { return Err(OptionError::InvalidValue); }
                        }
                        if let Some(maxval) = maxval {
                            if fval > maxval { return Err(OptionError::InvalidValue); }
                        }
                    },
                    _ => return Err(OptionError::InvalidFormat),
                };
                Ok(())
            },
            NAValue::Float(fval) => {
                match self.opt_type {
                    NAOptionDefinitionType::Int(minval, maxval) => {
                        let intval = fval as i64;
                        if let Some(minval) = minval {
                            if intval < minval { return Err(OptionError::InvalidValue); }
                        }
                        if let Some(maxval) = maxval {
                            if intval > maxval { return Err(OptionError::InvalidValue); }
                        }
                    },
                    NAOptionDefinitionType::Float(minval, maxval) => {
                        if let Some(minval) = minval {
                            if fval < minval { return Err(OptionError::InvalidValue); }
                        }
                        if let Some(maxval) = maxval {
                            if fval > maxval { return Err(OptionError::InvalidValue); }
                        }
                    },
                    _ => return Err(OptionError::InvalidFormat),
                };
                Ok(())
            },
            NAValue::String(ref cur_str) => {
                if let NAOptionDefinitionType::String(Some(ref strings)) = self.opt_type {
                    for str in strings.iter() {
                        if cur_str == str {
                            return Ok(());
                        }
                    }
                    Err(OptionError::InvalidValue)
                } else {
                    Ok(())
                }
            },
            NAValue::Data(_) => Ok(()),
        }
    }
}

impl fmt::Display for NAOptionDefinition {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match self.opt_type {
            NAOptionDefinitionType::None => write!(f, "{}: {}", self.name, self.description),
            NAOptionDefinitionType::Bool => write!(f, "[no]{}: {}", self.name, self.description),
            NAOptionDefinitionType::String(ref str_list) => {
                if let Some(ref opts) = str_list {
                    write!(f, "{} {}: {}", self.name, opts.join("|"), self.description)
                } else {
                    write!(f, "{} <string>: {}", self.name, self.description)
                }
            },
            NAOptionDefinitionType::Int(minval, maxval) => {
                let range = match (&minval, &maxval) {
                        (Some(minval), None) => format!("{}-..", minval),
                        (None, Some(maxval)) => format!("..-{}", maxval),
                        (Some(minval), Some(maxval)) => format!("{}-{}", minval, maxval),
                        _ => "<integer>".to_string(),
                    };
                write!(f, "{} {}: {}", self.name, range, self.description)
            },
            NAOptionDefinitionType::Float(minval, maxval) => {
                let range = match (&minval, &maxval) {
                        (Some(minval), None) => format!("{}-..", minval),
                        (None, Some(maxval)) => format!("..-{}", maxval),
                        (Some(minval), Some(maxval)) => format!("{}-{}", minval, maxval),
                        _ => "<float>".to_string(),
                    };
                write!(f, "{} {}: {}", self.name, range, self.description)
            },
            NAOptionDefinitionType::Data => write!(f, "{} <binary data>: {}", self.name, self.description),
        }
    }
}

/// Option.
#[derive(Clone,Debug,PartialEq)]
pub struct NAOption {
    /// Option name.
    pub name:   &'static str,
    /// Option value.
    pub value:  NAValue,
}

/// A list of accepted option values.
#[derive(Debug,Clone,PartialEq)]
pub enum NAValue {
    /// Empty value.
    None,
    /// Boolean value.
    Bool(bool),
    /// Integer value.
    Int(i64),
    /// Floating point value.
    Float(f64),
    /// String value.
    String(String),
    /// Binary data value.
    Data(Arc<Vec<u8>>),
}

/// Trait for all objects that handle `NAOption`.
pub trait NAOptionHandler {
    /// Returns the options recognised by current object.
    fn get_supported_options(&self) -> &[NAOptionDefinition];
    /// Passes options for the object to set (or ignore).
    fn set_options(&mut self, options: &[NAOption]);
    /// Queries the current option value in the object (if present).
    fn query_option_value(&self, name: &str) -> Option<NAValue>;
}

#[cfg(test)]
mod test {
    use super::*;
    #[test]
    fn test_option_validation() {
        let option = NAOption {name: "option", value: NAValue::Int(42) };
        let mut def = NAOptionDefinition { name: "option", description: "", opt_type: NAOptionDefinitionType::Int(None, None) };
        assert!(def.check(&option).is_ok());
        def.opt_type = NAOptionDefinitionType::Int(None, Some(30));
        assert_eq!(def.check(&option), Err(OptionError::InvalidValue));
        def.opt_type = NAOptionDefinitionType::Int(Some(40), None);
        assert!(def.check(&option).is_ok());
        def.name = "option2";
        assert_eq!(def.check(&option), Err(OptionError::WrongName));
        let option = NAOption {name: "option", value: NAValue::String("test".to_string()) };
        let mut def = NAOptionDefinition { name: "option", description: "", opt_type: NAOptionDefinitionType::String(None) };
        assert!(def.check(&option).is_ok());
        def.opt_type = NAOptionDefinitionType::String(Some(&["a string", "test string"]));
        assert_eq!(def.check(&option), Err(OptionError::InvalidValue));
        def.opt_type = NAOptionDefinitionType::String(Some(&["a string", "test"]));
        assert!(def.check(&option).is_ok());
    }
    #[test]
    fn test_option_parsing() {
        let mut def = NAOptionDefinition { name: "option", description: "", opt_type: NAOptionDefinitionType::Float(None, None) };
        assert_eq!(def.parse(&"--option".to_string(), None), Err(OptionError::ParseError));
        assert_eq!(def.parse(&"--nooption".to_string(), None), Err(OptionError::InvalidFormat));
        assert_eq!(def.parse(&"--option".to_string(), Some(&"42".to_string())),
                   Ok((NAOption{name:"option",value: NAValue::Float(42.0)}, 2)));
        def.opt_type = NAOptionDefinitionType::Float(None, Some(40.0));
        assert_eq!(def.parse(&"--option".to_string(), Some(&"42".to_string())),
                   Err(OptionError::InvalidValue));
        let def = NAOptionDefinition { name: "option", description: "", opt_type: NAOptionDefinitionType::Bool };
        assert_eq!(def.parse(&"option".to_string(), None),
                   Ok((NAOption{name: "option", value: NAValue::Bool(true) }, 1)));
        assert_eq!(def.parse(&"nooption".to_string(), None),
                   Ok((NAOption{name: "option", value: NAValue::Bool(false) }, 1)));
    }
}
Commit	Line	Data
a0ddfb3d KS	1	//! Options support.
	2	//!
	3	//! This module contains the definitions for options and names for common options.
	4	//! Options are used to set custom parameters in e.g. decoders or muxers.
	5	//!
	6	//! As a rule target for options should provide a list of supported options and ignore unknown options.
	7
	8	use std::sync::Arc;
8a7d01e2	9	use std::fmt;
a0ddfb3d	10
ee0ca773 KS	11	/// Common name for keyframe interval option.
	12	pub const KEYFRAME_OPTION: &'static str = "key_int";
	13	/// Common description for keyframe interval option.
	14	pub const KEYFRAME_OPTION_DESC: &'static str = "Keyframe interval (0 - automatic)";
	15
a0ddfb3d KS	16	/// A list specifying option parsing and validating errors.
	17	#[derive(Clone,Copy,Debug,PartialEq)]
	18	pub enum OptionError {
	19	/// Input is not intended for the current option definition.
	20	WrongName,
	21	/// Option value is not in the expected format.
	22	InvalidFormat,
	23	/// Option value was not in the range.
	24	InvalidValue,
	25	/// Parse error.
	26	ParseError,
	27	}
	28
	29	/// A specialised `Result` type for option parsing/validation.
	30	pub type OptionResult<T> = Result<T, OptionError>;
	31
8a7d01e2 KS	32	/// Option definition type.
	33	#[derive(Debug)]
	34	pub enum NAOptionDefinitionType {
	35	/// Option may just be present.
	36	None,
	37	/// Option is a boolean value.
	38	Bool,
	39	/// Option is an integer with optional minimum and maximum value.
	40	Int(Option<i64>, Option<i64>),
	41	/// Option is a floating point number with optional minimum and maximum value.
	42	Float(Option<f64>, Option<f64>),
	43	/// Option is a string with an optional list of allowed values.
	44	String(Option<&'static [&'static str]>),
	45	/// Option is some binary data.
	46	Data,
	47	}
	48
a0ddfb3d KS	49	/// Option definition.
	50	#[derive(Debug)]
	51	pub struct NAOptionDefinition {
	52	/// Option name.
	53	pub name: &'static str,
	54	/// Option meaning.
	55	pub description: &'static str,
8a7d01e2 KS	56	/// Option type.
8a7d01e2 KS	57	pub opt_type: NAOptionDefinitionType,
a0ddfb3d KS	58	}
	59
	60	impl NAOptionDefinition {
	61	/// Tries to parse input string(s) as an option and returns new option and number of arguments used (1 or 2) on success.
	62	pub fn parse(&self, name: &String, value: Option<&String>) -> OptionResult<(NAOption, usize)> {
	63	let no_name = "no".to_owned() + self.name;
	64	let opt_no_name = "--no".to_owned() + self.name;
	65	if name == &no_name \|\| name == &opt_no_name {
8a7d01e2 KS	66	match self.opt_type {
8a7d01e2 KS	67	NAOptionDefinitionType::Bool => return Ok((NAOption { name: self.name, value: NAValue::Bool(false) }, 1)),
a0ddfb3d KS	68	_ => return Err(OptionError::InvalidFormat),
	69	};
	70	}
	71	let opt_name = "--".to_owned() + self.name;
	72	if self.name != name && &opt_name != name {
	73	return Err(OptionError::WrongName);
	74	}
8a7d01e2 KS	75	match self.opt_type {
	76	NAOptionDefinitionType::None => Ok((NAOption { name: self.name, value: NAValue::None }, 1)),
	77	NAOptionDefinitionType::Bool => Ok((NAOption { name: self.name, value: NAValue::Bool(true) }, 1)),
	78	NAOptionDefinitionType::Int(_, _) => {
a0ddfb3d KS	79	if let Some(str) = value {
	80	let ret = str.parse::<i64>();
	81	if let Ok(val) = ret {
8a7d01e2	82	let opt = NAOption { name: self.name, value: NAValue::Int(val) };
a0ddfb3d KS	83	self.check(&opt)?;
	84	Ok((opt, 2))
	85	} else {
	86	Err(OptionError::ParseError)
	87	}
	88	} else {
	89	Err(OptionError::ParseError)
	90	}
	91	},
8a7d01e2	92	NAOptionDefinitionType::Float(_, _) => {
a0ddfb3d KS	93	if let Some(str) = value {
	94	let ret = str.parse::<f64>();
	95	if let Ok(val) = ret {
	96	let opt = NAOption { name: self.name, value: NAValue::Float(val) };
	97	self.check(&opt)?;
	98	Ok((opt, 2))
	99	} else {
	100	Err(OptionError::ParseError)
	101	}
	102	} else {
	103	Err(OptionError::ParseError)
	104	}
	105	},
8a7d01e2	106	NAOptionDefinitionType::String(_) => {
a0ddfb3d KS	107	if let Some(str) = value {
	108	let opt = NAOption { name: self.name, value: NAValue::String(str.to_string()) };
	109	self.check(&opt)?;
	110	Ok((opt, 2))
	111	} else {
	112	Err(OptionError::ParseError)
	113	}
	114	},
	115	_ => unimplemented!(),
	116	}
	117	}
	118	/// Checks whether input option conforms to the definition i.e. whether it has proper format and it lies in range.
	119	pub fn check(&self, option: &NAOption) -> OptionResult<()> {
	120	if option.name != self.name {
	121	return Err(OptionError::WrongName);
	122	}
	123	match option.value {
	124	NAValue::None => Ok(()),
	125	NAValue::Bool(_) => Ok(()),
	126	NAValue::Int(intval) => {
8a7d01e2 KS	127	match self.opt_type {
	128	NAOptionDefinitionType::Int(minval, maxval) => {
	129	if let Some(minval) = minval {
	130	if intval < minval { return Err(OptionError::InvalidValue); }
	131	}
	132	if let Some(maxval) = maxval {
	133	if intval > maxval { return Err(OptionError::InvalidValue); }
	134	}
	135	},
	136	NAOptionDefinitionType::Float(minval, maxval) => {
	137	let fval = intval as f64;
	138	if let Some(minval) = minval {
	139	if fval < minval { return Err(OptionError::InvalidValue); }
	140	}
	141	if let Some(maxval) = maxval {
	142	if fval > maxval { return Err(OptionError::InvalidValue); }
	143	}
	144	},
	145	_ => return Err(OptionError::InvalidFormat),
	146	};
a0ddfb3d KS	147	Ok(())
	148	},
	149	NAValue::Float(fval) => {
8a7d01e2 KS	150	match self.opt_type {
	151	NAOptionDefinitionType::Int(minval, maxval) => {
	152	let intval = fval as i64;
	153	if let Some(minval) = minval {
	154	if intval < minval { return Err(OptionError::InvalidValue); }
	155	}
	156	if let Some(maxval) = maxval {
	157	if intval > maxval { return Err(OptionError::InvalidValue); }
	158	}
	159	},
	160	NAOptionDefinitionType::Float(minval, maxval) => {
	161	if let Some(minval) = minval {
	162	if fval < minval { return Err(OptionError::InvalidValue); }
	163	}
	164	if let Some(maxval) = maxval {
	165	if fval > maxval { return Err(OptionError::InvalidValue); }
	166	}
	167	},
	168	_ => return Err(OptionError::InvalidFormat),
	169	};
a0ddfb3d KS	170	Ok(())
	171	},
	172	NAValue::String(ref cur_str) => {
8a7d01e2	173	if let NAOptionDefinitionType::String(Some(ref strings)) = self.opt_type {
a0ddfb3d KS	174	for str in strings.iter() {
	175	if cur_str == str {
	176	return Ok(());
	177	}
	178	}
	179	Err(OptionError::InvalidValue)
	180	} else {
	181	Ok(())
	182	}
	183	},
	184	NAValue::Data(_) => Ok(()),
	185	}
	186	}
8a7d01e2 KS	187	}
	188
	189	impl fmt::Display for NAOptionDefinition {
	190	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
	191	match self.opt_type {
	192	NAOptionDefinitionType::None => write!(f, "{}: {}", self.name, self.description),
	193	NAOptionDefinitionType::Bool => write!(f, "[no]{}: {}", self.name, self.description),
	194	NAOptionDefinitionType::String(ref str_list) => {
	195	if let Some(ref opts) = str_list {
	196	write!(f, "{} {}: {}", self.name, opts.join("\|"), self.description)
	197	} else {
	198	write!(f, "{} <string>: {}", self.name, self.description)
	199	}
a0ddfb3d	200	},
8a7d01e2 KS	201	NAOptionDefinitionType::Int(minval, maxval) => {
	202	let range = match (&minval, &maxval) {
	203	(Some(minval), None) => format!("{}-..", minval),
	204	(None, Some(maxval)) => format!("..-{}", maxval),
	205	(Some(minval), Some(maxval)) => format!("{}-{}", minval, maxval),
	206	_ => "<integer>".to_string(),
	207	};
	208	write!(f, "{} {}: {}", self.name, range, self.description)
a0ddfb3d	209	},
8a7d01e2 KS	210	NAOptionDefinitionType::Float(minval, maxval) => {
	211	let range = match (&minval, &maxval) {
	212	(Some(minval), None) => format!("{}-..", minval),
	213	(None, Some(maxval)) => format!("..-{}", maxval),
	214	(Some(minval), Some(maxval)) => format!("{}-{}", minval, maxval),
	215	_ => "<float>".to_string(),
	216	};
	217	write!(f, "{} {}: {}", self.name, range, self.description)
a0ddfb3d	218	},
8a7d01e2	219	NAOptionDefinitionType::Data => write!(f, "{} <binary data>: {}", self.name, self.description),
a0ddfb3d KS	220	}
	221	}
	222	}
	223
	224	/// Option.
	225	#[derive(Clone,Debug,PartialEq)]
	226	pub struct NAOption {
	227	/// Option name.
	228	pub name: &'static str,
	229	/// Option value.
	230	pub value: NAValue,
	231	}
	232
	233	/// A list of accepted option values.
	234	#[derive(Debug,Clone,PartialEq)]
	235	pub enum NAValue {
	236	/// Empty value.
	237	None,
	238	/// Boolean value.
	239	Bool(bool),
	240	/// Integer value.
8a7d01e2	241	Int(i64),
a0ddfb3d KS	242	/// Floating point value.
	243	Float(f64),
	244	/// String value.
	245	String(String),
	246	/// Binary data value.
	247	Data(Arc<Vec<u8>>),
	248	}
	249
	250	/// Trait for all objects that handle `NAOption`.
	251	pub trait NAOptionHandler {
	252	/// Returns the options recognised by current object.
	253	fn get_supported_options(&self) -> &[NAOptionDefinition];
	254	/// Passes options for the object to set (or ignore).
	255	fn set_options(&mut self, options: &[NAOption]);
	256	/// Queries the current option value in the object (if present).
	257	fn query_option_value(&self, name: &str) -> Option<NAValue>;
	258	}
	259
	260	#[cfg(test)]
	261	mod test {
	262	use super::*;
	263	#[test]
	264	fn test_option_validation() {
	265	let option = NAOption {name: "option", value: NAValue::Int(42) };
8a7d01e2	266	let mut def = NAOptionDefinition { name: "option", description: "", opt_type: NAOptionDefinitionType::Int(None, None) };
a0ddfb3d	267	assert!(def.check(&option).is_ok());
8a7d01e2	268	def.opt_type = NAOptionDefinitionType::Int(None, Some(30));
a0ddfb3d	269	assert_eq!(def.check(&option), Err(OptionError::InvalidValue));
8a7d01e2	270	def.opt_type = NAOptionDefinitionType::Int(Some(40), None);
a0ddfb3d KS	271	assert!(def.check(&option).is_ok());
	272	def.name = "option2";
	273	assert_eq!(def.check(&option), Err(OptionError::WrongName));
	274	let option = NAOption {name: "option", value: NAValue::String("test".to_string()) };
8a7d01e2	275	let mut def = NAOptionDefinition { name: "option", description: "", opt_type: NAOptionDefinitionType::String(None) };
a0ddfb3d	276	assert!(def.check(&option).is_ok());
8a7d01e2	277	def.opt_type = NAOptionDefinitionType::String(Some(&["a string", "test string"]));
a0ddfb3d	278	assert_eq!(def.check(&option), Err(OptionError::InvalidValue));
8a7d01e2	279	def.opt_type = NAOptionDefinitionType::String(Some(&["a string", "test"]));
a0ddfb3d KS	280	assert!(def.check(&option).is_ok());
	281	}
	282	#[test]
	283	fn test_option_parsing() {
8a7d01e2	284	let mut def = NAOptionDefinition { name: "option", description: "", opt_type: NAOptionDefinitionType::Float(None, None) };
a0ddfb3d KS	285	assert_eq!(def.parse(&"--option".to_string(), None), Err(OptionError::ParseError));
	286	assert_eq!(def.parse(&"--nooption".to_string(), None), Err(OptionError::InvalidFormat));
	287	assert_eq!(def.parse(&"--option".to_string(), Some(&"42".to_string())),
	288	Ok((NAOption{name:"option",value: NAValue::Float(42.0)}, 2)));
8a7d01e2	289	def.opt_type = NAOptionDefinitionType::Float(None, Some(40.0));
a0ddfb3d KS	290	assert_eq!(def.parse(&"--option".to_string(), Some(&"42".to_string())),
a0ddfb3d KS	291	Err(OptionError::InvalidValue));
8a7d01e2	292	let def = NAOptionDefinition { name: "option", description: "", opt_type: NAOptionDefinitionType::Bool };
a0ddfb3d KS	293	assert_eq!(def.parse(&"option".to_string(), None),
	294	Ok((NAOption{name: "option", value: NAValue::Bool(true) }, 1)));
	295	assert_eq!(def.parse(&"nooption".to_string(), None),
	296	Ok((NAOption{name: "option", value: NAValue::Bool(false) }, 1)));
	297	}
	298	}