Enum Value

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pub enum Value {
    Null,
    Bool(bool),
    Number(Number),
    String(String),
    List(Vec<Value>),
    Map(Map),
    Variant(Variant),
}
Expand description

Represents any Eon value.

Load an Eon document into a Value using Value::from_str. Serialize a Value into an Eon string using Value::format.

§See also

A Value does NOT include comments. For that, use eon_syntax::TokenTree.

Variants§

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Null

Special null value

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Bool(bool)

true or false

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Number(Number)

An integer or floating point number

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String(String)

A string value, like "Hello, world!"

Also commonly used as the key in a Map.

Strings are also used for simple sum-type (enum) variants values, e.g. "Maybe". See Self::Variant for more complex sum-type (enum) variants.

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List(Vec<Value>)

A list of values.

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Map(Map)

Maps strings to values, i.e. like a struct.

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Variant(Variant)

A sum-type (enum) variant containing some data, like "Rgb"(255, 0, 0).

For simple enum types (e.g. enum Maybe { Yes, No }), the variants will be represented as Self::String instead.

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impl Value

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pub fn new_variant(name: String, values: Vec<Self>) -> Self

Construct a variant of an enum (sum-type) with a name and optional values.

If the values is empty, this will return a Value::String, otherwise it will return a Value::Variant.

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pub fn format(&self, options: &FormatOptions) -> String

Pretty-print a Value to an Eon string.

You can parse the result with Value::from_str.

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pub fn as_bool(&self) -> Option<bool>

Return the bool value iff this is a Value::Bool.

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pub fn as_number(&self) -> Option<&Number>

Return the number iff this is a Value::Number.

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

Return the string iff this is a Value::String.

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pub fn as_list(&self) -> Option<&[Self]>

Return the list iff this is a Value::List.

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pub fn as_map(&self) -> Option<&Map>

Return the map iff this is a Value::Map.

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pub fn as_variant(&self) -> Option<&Variant>

Return the variant iff this is a Value::Variant.

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impl Value

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pub fn try_from_token_tree(eon_source: &str, tt: &TokenTree<'_>) -> Result<Self>

Try to parse a TokenTree into a Value.

You must provide the full Eon source string so that we can produce good error messages.

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pub fn try_from_tree_value( eon_source: &str, span: Option<Span>, value: &TokenValue<'_>, ) -> Result<Self>

Try to parse a TokenValue into a Value.

You must provide the full Eon source string so that we can produce good error messages.

Trait Implementations§

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impl Clone for Value

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fn clone(&self) -> Value

Returns a duplicate of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for Value

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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<'de> Deserialize<'de> for Value

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fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer. Read more
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impl Display for Value

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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 From<&[u8]> for Value

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fn from(value: &[u8]) -> Self

Converts to this type from the input type.
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impl From<&str> for Value

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fn from(value: &str) -> Self

Converts to this type from the input type.
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impl From<Map> for Value

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fn from(value: Map) -> Self

Converts to this type from the input type.
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impl From<Number> for Value

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fn from(value: Number) -> Self

Converts to this type from the input type.
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impl From<String> for Value

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fn from(value: String) -> Self

Converts to this type from the input type.
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impl From<Value> for TokenTree<'static>

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fn from(value: Value) -> Self

Converts to this type from the input type.
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impl From<Value> for TokenValue<'static>

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fn from(value: Value) -> Self

Converts to this type from the input type.
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impl From<Variant> for Value

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fn from(value: Variant) -> Self

Converts to this type from the input type.
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impl From<Vec<Value>> for Value

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fn from(value: Vec<Self>) -> Self

Converts to this type from the input type.
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impl From<bool> for Value

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fn from(value: bool) -> Self

Converts to this type from the input type.
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impl From<char> for Value

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fn from(value: char) -> Self

Converts to this type from the input type.
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impl From<f32> for Value

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fn from(value: f32) -> Self

Converts to this type from the input type.
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impl From<f64> for Value

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fn from(value: f64) -> Self

Converts to this type from the input type.
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impl From<i128> for Value

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fn from(value: i128) -> Self

Converts to this type from the input type.
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impl From<i16> for Value

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fn from(value: i16) -> Self

Converts to this type from the input type.
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impl From<i32> for Value

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fn from(value: i32) -> Self

Converts to this type from the input type.
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impl From<i64> for Value

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fn from(value: i64) -> Self

Converts to this type from the input type.
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impl From<i8> for Value

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fn from(value: i8) -> Self

Converts to this type from the input type.
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impl From<u128> for Value

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fn from(value: u128) -> Self

Converts to this type from the input type.
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impl From<u16> for Value

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fn from(value: u16) -> Self

Converts to this type from the input type.
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impl From<u32> for Value

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fn from(value: u32) -> Self

Converts to this type from the input type.
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impl From<u64> for Value

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fn from(value: u64) -> Self

Converts to this type from the input type.
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impl From<u8> for Value

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fn from(value: u8) -> Self

Converts to this type from the input type.
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impl FromStr for Value

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type Err = Error

The associated error which can be returned from parsing.
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fn from_str(eon_source: &str) -> Result<Self, Self::Err>

Parses a string s to return a value of this type. Read more
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impl Hash for Value

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fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl PartialEq for Value

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

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl Eq for Value

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impl StructuralPartialEq for Value

Auto Trait Implementations§

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impl Freeze for Value

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impl RefUnwindSafe for Value

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impl Send for Value

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impl Sync for Value

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impl Unpin for Value

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impl UnwindSafe for Value

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> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dest. Read more
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Compare self to key and return true if they are equal.
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impl<T> Fmt for T
where T: Display,

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fn fg<C>(self, color: C) -> Foreground<Self>
where C: Into<Option<Color>>, Self: Display,

Give this value the specified foreground colour.
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fn bg<C>(self, color: C) -> Background<Self>
where C: Into<Option<Color>>, Self: Display,

Give this value the specified background colour.
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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> Paint for T
where T: ?Sized,

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fn fg(&self, value: Color) -> Painted<&T>

Returns a styled value derived from self with the foreground set to value.

This method should be used rarely. Instead, prefer to use color-specific builder methods like red() and green(), which have the same functionality but are pithier.

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fn primary(&self) -> Painted<&T>

Returns self with the fg() set to [Color :: Primary].

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fn fixed(&self, color: u8) -> Painted<&T>

Returns self with the fg() set to [Color :: Fixed].

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fn rgb(&self, r: u8, g: u8, b: u8) -> Painted<&T>

Returns self with the fg() set to [Color :: Rgb].

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fn black(&self) -> Painted<&T>

Returns self with the fg() set to [Color :: Black].

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fn red(&self) -> Painted<&T>

Returns self with the fg() set to [Color :: Red].

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fn green(&self) -> Painted<&T>

Returns self with the fg() set to [Color :: Green].

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fn yellow(&self) -> Painted<&T>

Returns self with the fg() set to [Color :: Yellow].

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fn blue(&self) -> Painted<&T>

Returns self with the fg() set to [Color :: Blue].

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fn magenta(&self) -> Painted<&T>

Returns self with the fg() set to [Color :: Magenta].

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fn cyan(&self) -> Painted<&T>

Returns self with the fg() set to [Color :: Cyan].

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fn white(&self) -> Painted<&T>

Returns self with the fg() set to [Color :: White].

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fn bright_black(&self) -> Painted<&T>

Returns self with the fg() set to [Color :: BrightBlack].

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fn bright_red(&self) -> Painted<&T>

Returns self with the fg() set to [Color :: BrightRed].

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fn bright_green(&self) -> Painted<&T>

Returns self with the fg() set to [Color :: BrightGreen].

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fn bright_yellow(&self) -> Painted<&T>

Returns self with the fg() set to [Color :: BrightYellow].

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fn bright_blue(&self) -> Painted<&T>

Returns self with the fg() set to [Color :: BrightBlue].

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fn bright_magenta(&self) -> Painted<&T>

Returns self with the fg() set to [Color :: BrightMagenta].

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fn bright_cyan(&self) -> Painted<&T>

Returns self with the fg() set to [Color :: BrightCyan].

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fn bright_white(&self) -> Painted<&T>

Returns self with the fg() set to [Color :: BrightWhite].

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fn bg(&self, value: Color) -> Painted<&T>

Returns a styled value derived from self with the background set to value.

This method should be used rarely. Instead, prefer to use color-specific builder methods like on_red() and on_green(), which have the same functionality but are pithier.

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fn on_primary(&self) -> Painted<&T>

Returns self with the bg() set to [Color :: Primary].

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fn on_fixed(&self, color: u8) -> Painted<&T>

Returns self with the bg() set to [Color :: Fixed].

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fn on_rgb(&self, r: u8, g: u8, b: u8) -> Painted<&T>

Returns self with the bg() set to [Color :: Rgb].

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fn on_black(&self) -> Painted<&T>

Returns self with the bg() set to [Color :: Black].

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fn on_red(&self) -> Painted<&T>

Returns self with the bg() set to [Color :: Red].

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fn on_green(&self) -> Painted<&T>

Returns self with the bg() set to [Color :: Green].

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fn on_yellow(&self) -> Painted<&T>

Returns self with the bg() set to [Color :: Yellow].

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fn on_blue(&self) -> Painted<&T>

Returns self with the bg() set to [Color :: Blue].

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fn on_magenta(&self) -> Painted<&T>

Returns self with the bg() set to [Color :: Magenta].

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fn on_cyan(&self) -> Painted<&T>

Returns self with the bg() set to [Color :: Cyan].

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fn on_white(&self) -> Painted<&T>

Returns self with the bg() set to [Color :: White].

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fn on_bright_black(&self) -> Painted<&T>

Returns self with the bg() set to [Color :: BrightBlack].

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fn on_bright_red(&self) -> Painted<&T>

Returns self with the bg() set to [Color :: BrightRed].

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fn on_bright_green(&self) -> Painted<&T>

Returns self with the bg() set to [Color :: BrightGreen].

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fn on_bright_yellow(&self) -> Painted<&T>

Returns self with the bg() set to [Color :: BrightYellow].

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fn on_bright_blue(&self) -> Painted<&T>

Returns self with the bg() set to [Color :: BrightBlue].

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fn on_bright_magenta(&self) -> Painted<&T>

Returns self with the bg() set to [Color :: BrightMagenta].

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fn on_bright_cyan(&self) -> Painted<&T>

Returns self with the bg() set to [Color :: BrightCyan].

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fn on_bright_white(&self) -> Painted<&T>

Returns self with the bg() set to [Color :: BrightWhite].

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fn attr(&self, value: Attribute) -> Painted<&T>

Enables the styling Attribute value.

This method should be used rarely. Instead, prefer to use attribute-specific builder methods like bold() and underline(), which have the same functionality but are pithier.

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Make text bold using using bold().

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fn bold(&self) -> Painted<&T>

Returns self with the attr() set to [Attribute :: Bold].

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fn dim(&self) -> Painted<&T>

Returns self with the attr() set to [Attribute :: Dim].

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fn italic(&self) -> Painted<&T>

Returns self with the attr() set to [Attribute :: Italic].

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fn underline(&self) -> Painted<&T>

Returns self with the attr() set to [Attribute :: Underline].

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Returns self with the attr() set to [Attribute :: Blink].

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Returns self with the attr() set to [Attribute :: RapidBlink].

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fn invert(&self) -> Painted<&T>

Returns self with the attr() set to [Attribute :: Invert].

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fn conceal(&self) -> Painted<&T>

Returns self with the attr() set to [Attribute :: Conceal].

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Returns self with the attr() set to [Attribute :: Strike].

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fn quirk(&self, value: Quirk) -> Painted<&T>

Enables the yansi Quirk value.

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Enable wrapping using wrap().

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Returns self with the quirk() set to [Quirk :: Mask].

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Returns self with the quirk() set to [Quirk :: Wrap].

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Returns self with the quirk() set to [Quirk :: Linger].

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fn clear(&self) -> Painted<&T>

👎Deprecated since 1.0.1: renamed to resetting() due to conflicts with Vec::clear(). The clear() method will be removed in a future release.

Returns self with the quirk() set to [Quirk :: Clear].

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Returns self with the quirk() set to [Quirk :: Resetting].

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Returns self with the quirk() set to [Quirk :: Bright].

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Returns self with the quirk() set to [Quirk :: OnBright].

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fn whenever(&self, value: Condition) -> Painted<&T>

Conditionally enable styling based on whether the Condition value applies. Replaces any previous condition.

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fn new(self) -> Painted<Self>
where Self: Sized,

Create a new Painted with a default Style. Read more
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fn paint<S>(&self, style: S) -> Painted<&Self>
where S: Into<Style>,

Apply a style wholesale to self. Any previous style is replaced. Read more
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T> ToString for T
where T: Display + ?Sized,

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fn to_string(&self) -> String

Converts the given value to a String. Read more
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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.
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impl<T> DeserializeOwned for T
where T: for<'de> Deserialize<'de>,