Change parse_number and parse_unit to return Results directly
This commit is contained in:
parent
54118ca879
commit
3dee08d6d4
1 changed files with 71 additions and 81 deletions
152
src/parse.rs
152
src/parse.rs
|
@ -21,12 +21,7 @@ pub fn parse(input: &str) -> Result<Vec<NonMetricQuantity>, ParseError> {
|
|||
for token in tokenize(input) {
|
||||
match (&state, token) {
|
||||
(Expect::Number, Token::Number(number)) => {
|
||||
let number = match parse_number(&number) {
|
||||
Some(number) => number,
|
||||
None => {
|
||||
return Err(ParseError::NotValidNumber(number));
|
||||
}
|
||||
};
|
||||
let number = parse_number(number)?;
|
||||
amount = Some(number);
|
||||
state = Expect::Unit;
|
||||
}
|
||||
|
@ -37,12 +32,7 @@ pub fn parse(input: &str) -> Result<Vec<NonMetricQuantity>, ParseError> {
|
|||
unreachable!("token stream can't contain two numbers in a row");
|
||||
}
|
||||
(Expect::Unit, Token::Unit(unit)) => {
|
||||
let unit = match parse_unit(&unit) {
|
||||
Some(unit) => unit,
|
||||
None => {
|
||||
return Err(ParseError::UnknownUnit(unit));
|
||||
}
|
||||
};
|
||||
let unit = parse_unit(unit)?;
|
||||
let quantity = NonMetricQuantity {
|
||||
amount: amount.take().expect("must have read a number to be in this state"),
|
||||
unit: unit,
|
||||
|
@ -63,51 +53,51 @@ pub fn parse(input: &str) -> Result<Vec<NonMetricQuantity>, ParseError> {
|
|||
Ok(quantities)
|
||||
}
|
||||
|
||||
fn parse_number(input: &str) -> Option<f64> {
|
||||
fn parse_number(input: String) -> Result<f64, ParseError> {
|
||||
let no_whitespace: String = input.chars().filter(|c| !c.is_whitespace()).collect();
|
||||
no_whitespace.parse().ok()
|
||||
no_whitespace.parse().or_else(|_| Err(ParseError::NotValidNumber(input)))
|
||||
}
|
||||
|
||||
fn parse_unit(input: &str) -> Option<NonMetric> {
|
||||
match input {
|
||||
fn parse_unit(input: String) -> Result<NonMetric, ParseError> {
|
||||
match input.as_str() {
|
||||
// Length
|
||||
"inch" => Some(NonMetric::Inch),
|
||||
"inches" => Some(NonMetric::Inch),
|
||||
"in" => Some(NonMetric::Inch),
|
||||
"\"" => Some(NonMetric::Inch),
|
||||
"″" => Some(NonMetric::Inch),
|
||||
"inch" => Ok(NonMetric::Inch),
|
||||
"inches" => Ok(NonMetric::Inch),
|
||||
"in" => Ok(NonMetric::Inch),
|
||||
"\"" => Ok(NonMetric::Inch),
|
||||
"″" => Ok(NonMetric::Inch),
|
||||
|
||||
"foot" => Some(NonMetric::Foot),
|
||||
"feet" => Some(NonMetric::Foot),
|
||||
"ft" => Some(NonMetric::Foot),
|
||||
"'" => Some(NonMetric::Foot),
|
||||
"′" => Some(NonMetric::Foot),
|
||||
"foot" => Ok(NonMetric::Foot),
|
||||
"feet" => Ok(NonMetric::Foot),
|
||||
"ft" => Ok(NonMetric::Foot),
|
||||
"'" => Ok(NonMetric::Foot),
|
||||
"′" => Ok(NonMetric::Foot),
|
||||
|
||||
"yard" => Some(NonMetric::Yard),
|
||||
"yards" => Some(NonMetric::Yard),
|
||||
"yd" => Some(NonMetric::Yard),
|
||||
"yard" => Ok(NonMetric::Yard),
|
||||
"yards" => Ok(NonMetric::Yard),
|
||||
"yd" => Ok(NonMetric::Yard),
|
||||
|
||||
"mile" => Some(NonMetric::Mile),
|
||||
"miles" => Some(NonMetric::Mile),
|
||||
"mi" => Some(NonMetric::Mile),
|
||||
"m" => Some(NonMetric::Mile),
|
||||
"mile" => Ok(NonMetric::Mile),
|
||||
"miles" => Ok(NonMetric::Mile),
|
||||
"mi" => Ok(NonMetric::Mile),
|
||||
"m" => Ok(NonMetric::Mile),
|
||||
|
||||
// Weight
|
||||
"ounce" => Some(NonMetric::Ounce),
|
||||
"ounces" => Some(NonMetric::Ounce),
|
||||
"oz" => Some(NonMetric::Ounce),
|
||||
"ounce" => Ok(NonMetric::Ounce),
|
||||
"ounces" => Ok(NonMetric::Ounce),
|
||||
"oz" => Ok(NonMetric::Ounce),
|
||||
|
||||
"pound" => Some(NonMetric::Pound),
|
||||
"pounds" => Some(NonMetric::Pound),
|
||||
"lb" => Some(NonMetric::Pound),
|
||||
"lbs" => Some(NonMetric::Pound),
|
||||
"#" => Some(NonMetric::Pound),
|
||||
"pound" => Ok(NonMetric::Pound),
|
||||
"pounds" => Ok(NonMetric::Pound),
|
||||
"lb" => Ok(NonMetric::Pound),
|
||||
"lbs" => Ok(NonMetric::Pound),
|
||||
"#" => Ok(NonMetric::Pound),
|
||||
|
||||
"stone" => Some(NonMetric::Stone),
|
||||
"stones" => Some(NonMetric::Stone),
|
||||
"st" => Some(NonMetric::Stone),
|
||||
"stone" => Ok(NonMetric::Stone),
|
||||
"stones" => Ok(NonMetric::Stone),
|
||||
"st" => Ok(NonMetric::Stone),
|
||||
|
||||
_ => None,
|
||||
_ => Err(ParseError::UnknownUnit(input)),
|
||||
}
|
||||
}
|
||||
|
||||
|
@ -204,56 +194,56 @@ mod test {
|
|||
|
||||
#[test]
|
||||
fn numbers() {
|
||||
assert_eq!(parse_number(""), None);
|
||||
assert_eq!(parse_number("1"), Some(1.0));
|
||||
assert_eq!(parse_number("1.0"), Some(1.0));
|
||||
assert_eq!(parse_number("0.1"), Some(0.1));
|
||||
assert_eq!(parse_number("0.1."), None);
|
||||
assert_eq!(parse_number("-10"), Some(-10.0));
|
||||
assert_eq!(parse_number("10\t00\u{1680}000"), Some(10_00_000.0));
|
||||
assert_eq!(parse_number("".to_string()), Err(ParseError::NotValidNumber("".to_string())));
|
||||
assert_eq!(parse_number("1".to_string()), Ok(1.0));
|
||||
assert_eq!(parse_number("1.0".to_string()), Ok(1.0));
|
||||
assert_eq!(parse_number("0.1".to_string()), Ok(0.1));
|
||||
assert_eq!(parse_number("0.1.".to_string()), Err(ParseError::NotValidNumber("0.1.".to_string())));
|
||||
assert_eq!(parse_number("-10".to_string()), Ok(-10.0));
|
||||
assert_eq!(parse_number("10\t00\u{1680}000".to_string()), Ok(10_00_000.0));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn units() {
|
||||
// Length
|
||||
assert_eq!(parse_unit("inch"), Some(NonMetric::Inch));
|
||||
assert_eq!(parse_unit("inches"), Some(NonMetric::Inch));
|
||||
assert_eq!(parse_unit("in"), Some(NonMetric::Inch));
|
||||
assert_eq!(parse_unit("\""), Some(NonMetric::Inch));
|
||||
assert_eq!(parse_unit("″"), Some(NonMetric::Inch));
|
||||
assert_eq!(parse_unit("inch".to_string()), Ok(NonMetric::Inch));
|
||||
assert_eq!(parse_unit("inches".to_string()), Ok(NonMetric::Inch));
|
||||
assert_eq!(parse_unit("in".to_string()), Ok(NonMetric::Inch));
|
||||
assert_eq!(parse_unit("\"".to_string()), Ok(NonMetric::Inch));
|
||||
assert_eq!(parse_unit("″".to_string()), Ok(NonMetric::Inch));
|
||||
|
||||
assert_eq!(parse_unit("foot"), Some(NonMetric::Foot));
|
||||
assert_eq!(parse_unit("feet"), Some(NonMetric::Foot));
|
||||
assert_eq!(parse_unit("ft"), Some(NonMetric::Foot));
|
||||
assert_eq!(parse_unit("'"), Some(NonMetric::Foot));
|
||||
assert_eq!(parse_unit("′"), Some(NonMetric::Foot));
|
||||
assert_eq!(parse_unit("foot".to_string()), Ok(NonMetric::Foot));
|
||||
assert_eq!(parse_unit("feet".to_string()), Ok(NonMetric::Foot));
|
||||
assert_eq!(parse_unit("ft".to_string()), Ok(NonMetric::Foot));
|
||||
assert_eq!(parse_unit("'".to_string()), Ok(NonMetric::Foot));
|
||||
assert_eq!(parse_unit("′".to_string()), Ok(NonMetric::Foot));
|
||||
|
||||
assert_eq!(parse_unit("yard"), Some(NonMetric::Yard));
|
||||
assert_eq!(parse_unit("yards"), Some(NonMetric::Yard));
|
||||
assert_eq!(parse_unit("yd"), Some(NonMetric::Yard));
|
||||
assert_eq!(parse_unit("yard".to_string()), Ok(NonMetric::Yard));
|
||||
assert_eq!(parse_unit("yards".to_string()), Ok(NonMetric::Yard));
|
||||
assert_eq!(parse_unit("yd".to_string()), Ok(NonMetric::Yard));
|
||||
|
||||
assert_eq!(parse_unit("mile"), Some(NonMetric::Mile));
|
||||
assert_eq!(parse_unit("miles"), Some(NonMetric::Mile));
|
||||
assert_eq!(parse_unit("mi"), Some(NonMetric::Mile));
|
||||
assert_eq!(parse_unit("m"), Some(NonMetric::Mile));
|
||||
assert_eq!(parse_unit("mile".to_string()), Ok(NonMetric::Mile));
|
||||
assert_eq!(parse_unit("miles".to_string()), Ok(NonMetric::Mile));
|
||||
assert_eq!(parse_unit("mi".to_string()), Ok(NonMetric::Mile));
|
||||
assert_eq!(parse_unit("m".to_string()), Ok(NonMetric::Mile));
|
||||
|
||||
// Weight
|
||||
assert_eq!(parse_unit("ounce"), Some(NonMetric::Ounce));
|
||||
assert_eq!(parse_unit("ounces"), Some(NonMetric::Ounce));
|
||||
assert_eq!(parse_unit("oz"), Some(NonMetric::Ounce));
|
||||
assert_eq!(parse_unit("ounce".to_string()), Ok(NonMetric::Ounce));
|
||||
assert_eq!(parse_unit("ounces".to_string()), Ok(NonMetric::Ounce));
|
||||
assert_eq!(parse_unit("oz".to_string()), Ok(NonMetric::Ounce));
|
||||
|
||||
assert_eq!(parse_unit("pound"), Some(NonMetric::Pound));
|
||||
assert_eq!(parse_unit("pounds"), Some(NonMetric::Pound));
|
||||
assert_eq!(parse_unit("lb"), Some(NonMetric::Pound));
|
||||
assert_eq!(parse_unit("lbs"), Some(NonMetric::Pound));
|
||||
assert_eq!(parse_unit("#"), Some(NonMetric::Pound));
|
||||
assert_eq!(parse_unit("pound".to_string()), Ok(NonMetric::Pound));
|
||||
assert_eq!(parse_unit("pounds".to_string()), Ok(NonMetric::Pound));
|
||||
assert_eq!(parse_unit("lb".to_string()), Ok(NonMetric::Pound));
|
||||
assert_eq!(parse_unit("lbs".to_string()), Ok(NonMetric::Pound));
|
||||
assert_eq!(parse_unit("#".to_string()), Ok(NonMetric::Pound));
|
||||
|
||||
assert_eq!(parse_unit("stone"), Some(NonMetric::Stone));
|
||||
assert_eq!(parse_unit("stones"), Some(NonMetric::Stone));
|
||||
assert_eq!(parse_unit("st"), Some(NonMetric::Stone));
|
||||
assert_eq!(parse_unit("stone".to_string()), Ok(NonMetric::Stone));
|
||||
assert_eq!(parse_unit("stones".to_string()), Ok(NonMetric::Stone));
|
||||
assert_eq!(parse_unit("st".to_string()), Ok(NonMetric::Stone));
|
||||
|
||||
// Unknown unit
|
||||
assert_eq!(parse_unit("hutenosa"), None);
|
||||
assert_eq!(parse_unit("hutenosa".to_string()), Err(ParseError::UnknownUnit("hutenosa".to_string())));
|
||||
}
|
||||
|
||||
#[test]
|
||||
|
|
Loading…
Reference in a new issue