Enum scanlex::Token

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pub enum Token {
    Num(f64),
    Int(i64),
    Str(String),
    Iden(String),
    Char(char),
    Error(ScanError),
    End,
}
Expand description

Represents a token returned by Scanner::get

Variants§

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Num(f64)

a floating-point number, stored as double-precision float

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Int(i64)

an integer, stored as eight-byte unsigned

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Str(String)

a quoted string

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Iden(String)

an identifier \a+[\a\d_]*

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Char(char)

a character (anything not recognized as any of the above

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Error(ScanError)

represents an error

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End

end of stream

Implementations§

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impl Token

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pub fn finished(&self) -> bool

is this the end token?

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pub fn is_float(&self) -> bool

is this token a float?

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pub fn to_float(self) -> Option<f64>

extract the float

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pub fn to_float_result(self) -> Result<f64, ScanError>

extract the float, or complain

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pub fn is_integer(&self) -> bool

is this token an integer?

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pub fn to_integer(self) -> Option<i64>

extract the integer

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pub fn to_integer_result(self) -> Result<i64, ScanError>

extract the integer, or complain

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pub fn to_int_result<I: Int>(self) -> Result<I::Type, ScanError>

extract the integer as a particular subtype

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pub fn is_number(&self) -> bool

is this token an integer?

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pub fn to_number(self) -> Option<f64>

extract the number, not caring about float or integer

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pub fn to_number_result(self) -> Result<f64, ScanError>

extract the number, not caring about float or integer, or complain

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pub fn is_string(&self) -> bool

is this token a string?

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pub fn to_string(self) -> Option<String>

extract the string

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pub fn as_string(&self) -> Option<&str>

extract a reference the string

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pub fn to_string_result(self) -> Result<String, ScanError>

extract the string, or complain

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pub fn is_iden(&self) -> bool

is this token an identifier?

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pub fn to_iden(self) -> Option<String>

extract the identifier

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pub fn as_iden(&self) -> Option<&str>

extract a reference to the identifier

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pub fn to_iden_result(self) -> Result<String, ScanError>

extract the identifier, or complain

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pub fn is_char(&self) -> bool

is this token a character?

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pub fn to_char(self) -> Option<char>

extract the character

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pub fn as_char(&self) -> Option<char>

extract the character

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pub fn to_char_result(self) -> Result<char, ScanError>

extract the character, or complain

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pub fn is_error(&self) -> bool

is this token an error?

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pub fn to_error(self) -> Option<ScanError>

extract the error

Trait Implementations§

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impl Debug for Token

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl PartialEq for Token

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fn eq(&self, other: &Token) -> bool

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl StructuralPartialEq for Token

Auto Trait Implementations§

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impl RefUnwindSafe for Token

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impl Send for Token

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impl Sync for Token

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impl Unpin for Token

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impl UnwindSafe for Token

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.