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use std::fmt::{Display, Formatter, Result};
#[derive(Debug, Clone)]
pub enum Argument {
FunctionDefinition {
name: String,
default: Option<String>,
help: Option<String>,
arg_type: Option<String>
},
Variable ( String ),
Unnamed ( String )
}
#[cfg(test)]
mod tests {
mod definition {
use Argument;
#[test]
fn it_prints_an_argument_with_no_default() {
let arg = Argument::new("test", None, None, None);
assert_eq!("test", format!("{}", arg));
}
#[test]
fn it_prints_an_argument_with_a_default() {
let arg = Argument::new("test", Some(r#""value""#), None, None);
assert_eq!(r#"test="value""#, format!("{}", arg));
}
}
mod bare_argument {
use Argument;
#[test]
fn it_prints_an_argument() {
let arg = Argument::unnamed("world");
assert_eq!("\"world\"", format!("{}", arg));
}
}
mod function_argument {
use Argument;
#[test]
fn it_prints_an_argument() {
let arg = Argument::variable("name");
assert_eq!("name", format!("{}", arg));
}
}
}
impl Argument {
pub fn new<T: Display>(name: T,
default: Option<T>,
arg_type: Option<T>,
help: Option<T>)
-> Argument {
Argument::FunctionDefinition {
name: name.to_string(),
default: default.map(|s| s.to_string()),
arg_type: arg_type.map(|s| s.to_string()),
help: help.map(|s| s.to_string())
}
}
pub fn unnamed<T: Display>(value: T) -> Argument {
Argument::Unnamed(value.to_string())
}
pub fn variable<T: Display>(name: T) -> Argument {
Argument::Variable (name.to_string())
}
pub fn has_help(&self) -> bool {
match self {
&Argument::FunctionDefinition{ref help, .. } => help.is_some(),
_ => false,
}
}
pub fn help_string(&self) -> Option<String> {
match self {
&Argument::FunctionDefinition{ref help, ref name, ..} => {
let mut formatted_help = format!(":param {}:", name);
if let &Some(ref help_str) = help {
formatted_help.push_str(&format!(" {}", help_str)[..]);
Some(formatted_help)
} else {
None
}
},
_ => None,
}
}
pub fn type_string(&self) -> Option<String> {
match self {
&Argument::FunctionDefinition{ref arg_type, ref name, ..} => {
let mut help = format!(":type {}:", name);
if let &Some(ref t) = arg_type {
help.push_str(&format!(" {}", t)[..]);
Some(help)
} else {
None
}
},
_ => None,
}
}
}
impl Display for Argument {
fn fmt(&self, f: &mut Formatter) -> Result {
let mut output = String::new();
match self {
&Argument::FunctionDefinition{ref name, ref default, ..} => {
output.push_str(&name[..]);
if let &Some(ref default) = default {
output.push_str(&format!("={}", default));
}
},
&Argument::Unnamed(ref value) => {
output.push_str(&format!("\"{}\"", value)[..]);
},
&Argument::Variable(ref name) => {
output.push_str(&format!("{}", name)[..]);
},
}
write!(f, "{}", output)
}
}
#[derive(Debug, Clone)]
pub struct KeywordArgument {
pub keyword: String,
pub argument: String,
}
impl KeywordArgument {
pub fn new<T: Display>(name: T, arg: T) -> KeywordArgument {
KeywordArgument {
keyword: name.to_string(),
argument: arg.to_string(),
}
}
}
impl Display for KeywordArgument {
fn fmt(&self, f: &mut Formatter) -> Result {
write!(f, "{}={}", self.keyword, self.argument)
}
}