Enum serde_yaml::Value

pub enum Value {
    Null,
    Bool(bool),
    Number(Number),
    String(String),
    Sequence(Sequence),
    Mapping(Mapping),
    Tagged(Box<TaggedValue>),
}

Represents any valid YAML value.

Variants

Null

Represents a YAML null value.

Bool(bool)

Represents a YAML boolean.

Number(Number)

Represents a YAML numerical value, whether integer or floating point.

String(String)

Represents a YAML string.

Sequence(Sequence)

Represents a YAML sequence in which the elements are serde_yaml::Value.

Mapping(Mapping)

Represents a YAML mapping in which the keys and values are both serde_yaml::Value.

Tagged(Box<TaggedValue>)

A representation of YAML’s !Tag syntax, used for enums.

Implementations

impl Value

pub fn get<I: Index>(&self, index: I) -> Option<&Value>

Index into a YAML sequence or map. A string index can be used to access a value in a map, and a usize index can be used to access an element of an sequence.

Returns None if the type of self does not match the type of the index, for example if the index is a string and self is a sequence or a number. Also returns None if the given key does not exist in the map or the given index is not within the bounds of the sequence.

use serde_yaml::Value;

let object: Value = serde_yaml::from_str(r#"{ A: 65, B: 66, C: 67 }"#)?;
let x = object.get("A").unwrap();
assert_eq!(x, 65);

let sequence: Value = serde_yaml::from_str(r#"[ "A", "B", "C" ]"#)?;
let x = sequence.get(2).unwrap();
assert_eq!(x, &Value::String("C".into()));

assert_eq!(sequence.get("A"), None);

Square brackets can also be used to index into a value in a more concise way. This returns Value::Null in cases where get would have returned None.

let object: Value = serde_yaml::from_str(r#"
A: [a, á, à]
B: [b, b́]
C: [c, ć, ć̣, ḉ]
42: true
"#)?;
assert_eq!(object["B"][0], Value::String("b".into()));

assert_eq!(object[Value::String("D".into())], Value::Null);
assert_eq!(object["D"], Value::Null);
assert_eq!(object[0]["x"]["y"]["z"], Value::Null);

assert_eq!(object[42], Value::Bool(true));

pub fn get_mut<I: Index>(&mut self, index: I) -> Option<&mut Value>

Index into a YAML sequence or map. A string index can be used to access a value in a map, and a usize index can be used to access an element of an sequence.

Returns None if the type of self does not match the type of the index, for example if the index is a string and self is a sequence or a number. Also returns None if the given key does not exist in the map or the given index is not within the bounds of the sequence.

pub fn is_null(&self) -> bool

Returns true if the Value is a Null. Returns false otherwise.

For any Value on which is_null returns true, as_null is guaranteed to return Some(()).

let v: Value = serde_yaml::from_str("null").unwrap();
assert!(v.is_null());

let v: Value = serde_yaml::from_str("false").unwrap();
assert!(!v.is_null());

pub fn as_null(&self) -> Option<()>

If the Value is a Null, returns (). Returns None otherwise.

let v: Value = serde_yaml::from_str("null").unwrap();
assert_eq!(v.as_null(), Some(()));

let v: Value = serde_yaml::from_str("false").unwrap();
assert_eq!(v.as_null(), None);

pub fn is_bool(&self) -> bool

Returns true if the Value is a Boolean. Returns false otherwise.

For any Value on which is_boolean returns true, as_bool is guaranteed to return the boolean value.

let v: Value = serde_yaml::from_str("true").unwrap();
assert!(v.is_bool());

let v: Value = serde_yaml::from_str("42").unwrap();
assert!(!v.is_bool());

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

If the Value is a Boolean, returns the associated bool. Returns None otherwise.

let v: Value = serde_yaml::from_str("true").unwrap();
assert_eq!(v.as_bool(), Some(true));

let v: Value = serde_yaml::from_str("42").unwrap();
assert_eq!(v.as_bool(), None);

pub fn is_number(&self) -> bool

Returns true if the Value is a Number. Returns false otherwise.

let v: Value = serde_yaml::from_str("5").unwrap();
assert!(v.is_number());

let v: Value = serde_yaml::from_str("true").unwrap();
assert!(!v.is_number());

pub fn is_i64(&self) -> bool

Returns true if the Value is an integer between i64::MIN and i64::MAX.

For any Value on which is_i64 returns true, as_i64 is guaranteed to return the integer value.

let v: Value = serde_yaml::from_str("1337").unwrap();
assert!(v.is_i64());

let v: Value = serde_yaml::from_str("null").unwrap();
assert!(!v.is_i64());

pub fn as_i64(&self) -> Option<i64>

If the Value is an integer, represent it as i64 if possible. Returns None otherwise.

let v: Value = serde_yaml::from_str("1337").unwrap();
assert_eq!(v.as_i64(), Some(1337));

let v: Value = serde_yaml::from_str("false").unwrap();
assert_eq!(v.as_i64(), None);

pub fn is_u64(&self) -> bool

Returns true if the Value is an integer between u64::MIN and u64::MAX.

For any Value on which is_u64 returns true, as_u64 is guaranteed to return the integer value.

let v: Value = serde_yaml::from_str("1337").unwrap();
assert!(v.is_u64());

let v: Value = serde_yaml::from_str("null").unwrap();
assert!(!v.is_u64());

pub fn as_u64(&self) -> Option<u64>

If the Value is an integer, represent it as u64 if possible. Returns None otherwise.

let v: Value = serde_yaml::from_str("1337").unwrap();
assert_eq!(v.as_u64(), Some(1337));

let v: Value = serde_yaml::from_str("false").unwrap();
assert_eq!(v.as_u64(), None);

pub fn is_f64(&self) -> bool

Returns true if the Value is a number that can be represented by f64.

For any Value on which is_f64 returns true, as_f64 is guaranteed to return the floating point value.

Currently this function returns true if and only if both is_i64 and is_u64 return false but this is not a guarantee in the future.

let v: Value = serde_yaml::from_str("256.01").unwrap();
assert!(v.is_f64());

let v: Value = serde_yaml::from_str("true").unwrap();
assert!(!v.is_f64());

pub fn as_f64(&self) -> Option<f64>

If the Value is a number, represent it as f64 if possible. Returns None otherwise.

let v: Value = serde_yaml::from_str("13.37").unwrap();
assert_eq!(v.as_f64(), Some(13.37));

let v: Value = serde_yaml::from_str("false").unwrap();
assert_eq!(v.as_f64(), None);

pub fn is_string(&self) -> bool

Returns true if the Value is a String. Returns false otherwise.

For any Value on which is_string returns true, as_str is guaranteed to return the string slice.

let v: Value = serde_yaml::from_str("'lorem ipsum'").unwrap();
assert!(v.is_string());

let v: Value = serde_yaml::from_str("42").unwrap();
assert!(!v.is_string());

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

If the Value is a String, returns the associated str. Returns None otherwise.

let v: Value = serde_yaml::from_str("'lorem ipsum'").unwrap();
assert_eq!(v.as_str(), Some("lorem ipsum"));

let v: Value = serde_yaml::from_str("false").unwrap();
assert_eq!(v.as_str(), None);

pub fn is_sequence(&self) -> bool

Returns true if the Value is a sequence. Returns false otherwise.

let v: Value = serde_yaml::from_str("[1, 2, 3]").unwrap();
assert!(v.is_sequence());

let v: Value = serde_yaml::from_str("true").unwrap();
assert!(!v.is_sequence());

pub fn as_sequence(&self) -> Option<&Sequence>

If the Value is a sequence, return a reference to it if possible. Returns None otherwise.

let v: Value = serde_yaml::from_str("[1, 2]").unwrap();
assert_eq!(v.as_sequence(), Some(&vec![Value::Number(Number::from(1)), Value::Number(Number::from(2))]));

let v: Value = serde_yaml::from_str("false").unwrap();
assert_eq!(v.as_sequence(), None);

pub fn as_sequence_mut(&mut self) -> Option<&mut Sequence>

If the Value is a sequence, return a mutable reference to it if possible. Returns None otherwise.

let mut v: Value = serde_yaml::from_str("[1]").unwrap();
let s = v.as_sequence_mut().unwrap();
s.push(Value::Number(Number::from(2)));
assert_eq!(s, &vec![Value::Number(Number::from(1)), Value::Number(Number::from(2))]);

let mut v: Value = serde_yaml::from_str("false").unwrap();
assert_eq!(v.as_sequence_mut(), None);

pub fn is_mapping(&self) -> bool

Returns true if the Value is a mapping. Returns false otherwise.

let v: Value = serde_yaml::from_str("a: 42").unwrap();
assert!(v.is_mapping());

let v: Value = serde_yaml::from_str("true").unwrap();
assert!(!v.is_mapping());

pub fn as_mapping(&self) -> Option<&Mapping>

If the Value is a mapping, return a reference to it if possible. Returns None otherwise.

let v: Value = serde_yaml::from_str("a: 42").unwrap();

let mut expected = Mapping::new();
expected.insert(Value::String("a".into()),Value::Number(Number::from(42)));

assert_eq!(v.as_mapping(), Some(&expected));

let v: Value = serde_yaml::from_str("false").unwrap();
assert_eq!(v.as_mapping(), None);

pub fn as_mapping_mut(&mut self) -> Option<&mut Mapping>

If the Value is a mapping, return a reference to it if possible. Returns None otherwise.

let mut v: Value = serde_yaml::from_str("a: 42").unwrap();
let m = v.as_mapping_mut().unwrap();
m.insert(Value::String("b".into()), Value::Number(Number::from(21)));

let mut expected = Mapping::new();
expected.insert(Value::String("a".into()), Value::Number(Number::from(42)));
expected.insert(Value::String("b".into()), Value::Number(Number::from(21)));

assert_eq!(m, &expected);

let mut v: Value = serde_yaml::from_str("false").unwrap();
assert_eq!(v.as_mapping_mut(), None);

pub fn apply_merge(&mut self) -> Result<(), Error>

Performs merging of << keys into the surrounding mapping.

The intended use of this in YAML is described in https://yaml.org/type/merge.html.

use serde_yaml::Value;

let config = "\
tasks:
  build: &webpack_shared
    command: webpack
    args: build
    inputs:
      - 'src/**/*'
  start:
    <<: *webpack_shared
    args: start
";

let mut value: Value = serde_yaml::from_str(config).unwrap();
value.apply_merge().unwrap();

assert_eq!(value["tasks"]["start"]["command"], "webpack");
assert_eq!(value["tasks"]["start"]["args"], "start");

Trait Implementations

impl Clone for Value

fn clone(&self) -> Value

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Value

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

Formats the value using the given formatter.

impl Default for Value

The default value is Value::Null.

This is useful for handling omitted Value fields when deserializing.

Examples

use serde::Deserialize;
use serde_yaml::Value;

#[derive(Deserialize)]
struct Settings {
    level: i32,
    #[serde(default)]
    extras: Value,
}

let data = r#" { "level": 42 } "#;
let s: Settings = serde_yaml::from_str(data)?;

assert_eq!(s.level, 42);
assert_eq!(s.extras, Value::Null);

fn default() -> Value

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for Value

fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>

where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<'de> Deserializer<'de> for &'de Value

type Error = Error

The error type that can be returned if some error occurs during deserialization.

fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Require the Deserializer to figure out how to drive the visitor based on what data type is in the input.

fn deserialize_bool<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a bool value.

fn deserialize_i8<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an i8 value.

fn deserialize_i16<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an i16 value.

fn deserialize_i32<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an i32 value.

fn deserialize_i64<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an i64 value.

fn deserialize_i128<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an i128 value.

fn deserialize_u8<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a u8 value.

fn deserialize_u16<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a u16 value.

fn deserialize_u32<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a u32 value.

fn deserialize_u64<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a u64 value.

fn deserialize_u128<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an u128 value.

fn deserialize_f32<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a f32 value.

fn deserialize_f64<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a f64 value.

fn deserialize_char<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a char value.

fn deserialize_str<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a string value and does not benefit from taking ownership of buffered data owned by the Deserializer.

fn deserialize_string<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a string value and would benefit from taking ownership of buffered data owned by the Deserializer.

fn deserialize_bytes<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a byte array and does not benefit from taking ownership of buffered data owned by the Deserializer.

fn deserialize_byte_buf<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a byte array and would benefit from taking ownership of buffered data owned by the Deserializer.

fn deserialize_option<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an optional value.

fn deserialize_unit<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a unit value.

fn deserialize_unit_struct<V>( self, _name: &'static str, visitor: V ) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a unit struct with a particular name.

fn deserialize_newtype_struct<V>( self, _name: &'static str, visitor: V ) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a newtype struct with a particular name.

fn deserialize_seq<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a sequence of values.

fn deserialize_tuple<V>( self, _len: usize, visitor: V ) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a sequence of values and knows how many values there are without looking at the serialized data.

fn deserialize_tuple_struct<V>( self, _name: &'static str, _len: usize, visitor: V ) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a tuple struct with a particular name and number of fields.

fn deserialize_map<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a map of key-value pairs.

fn deserialize_struct<V>( self, _name: &'static str, _fields: &'static [&'static str], visitor: V ) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a struct with a particular name and fields.

fn deserialize_enum<V>( self, _name: &str, _variants: &'static [&'static str], visitor: V ) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an enum value with a particular name and possible variants.

fn deserialize_identifier<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting the name of a struct field or the discriminant of an enum variant.

fn deserialize_ignored_any<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type needs to deserialize a value whose type doesn’t matter because it is ignored.

fn is_human_readable(&self) -> bool

Determine whether Deserialize implementations should expect to deserialize their human-readable form.

impl<'de> Deserializer<'de> for Value

type Error = Error

The error type that can be returned if some error occurs during deserialization.

fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Require the Deserializer to figure out how to drive the visitor based on what data type is in the input.

fn deserialize_bool<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a bool value.

fn deserialize_i8<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an i8 value.

fn deserialize_i16<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an i16 value.

fn deserialize_i32<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an i32 value.

fn deserialize_i64<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an i64 value.

fn deserialize_i128<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an i128 value.

fn deserialize_u8<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a u8 value.

fn deserialize_u16<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a u16 value.

fn deserialize_u32<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a u32 value.

fn deserialize_u64<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a u64 value.

fn deserialize_u128<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an u128 value.

fn deserialize_f32<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a f32 value.

fn deserialize_f64<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a f64 value.

fn deserialize_char<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a char value.

fn deserialize_str<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a string value and does not benefit from taking ownership of buffered data owned by the Deserializer.

fn deserialize_string<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a string value and would benefit from taking ownership of buffered data owned by the Deserializer.

fn deserialize_bytes<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a byte array and does not benefit from taking ownership of buffered data owned by the Deserializer.

fn deserialize_byte_buf<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a byte array and would benefit from taking ownership of buffered data owned by the Deserializer.

fn deserialize_option<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an optional value.

fn deserialize_unit<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a unit value.

fn deserialize_unit_struct<V>( self, _name: &'static str, visitor: V ) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a unit struct with a particular name.

fn deserialize_newtype_struct<V>( self, _name: &'static str, visitor: V ) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a newtype struct with a particular name.

fn deserialize_seq<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a sequence of values.

fn deserialize_tuple<V>( self, _len: usize, visitor: V ) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a sequence of values and knows how many values there are without looking at the serialized data.

fn deserialize_tuple_struct<V>( self, _name: &'static str, _len: usize, visitor: V ) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a tuple struct with a particular name and number of fields.

fn deserialize_map<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a map of key-value pairs.

fn deserialize_struct<V>( self, _name: &'static str, _fields: &'static [&'static str], visitor: V ) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a struct with a particular name and fields.

fn deserialize_enum<V>( self, _name: &str, _variants: &'static [&'static str], visitor: V ) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an enum value with a particular name and possible variants.

fn deserialize_identifier<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting the name of a struct field or the discriminant of an enum variant.

fn deserialize_ignored_any<V>(self, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Hint that the Deserialize type needs to deserialize a value whose type doesn’t matter because it is ignored.

fn is_human_readable(&self) -> bool

Determine whether Deserialize implementations should expect to deserialize their human-readable form.

impl<'a, T: Clone + Into<Value>> From<&'a [T]> for Value

fn from(f: &'a [T]) -> Self

Convert a slice to Value

Examples

use serde_yaml::Value;

let v: &[&str] = &["lorem", "ipsum", "dolor"];
let x: Value = v.into();

impl<'a> From<&'a str> for Value

fn from(f: &str) -> Self

Convert string slice to Value

Examples

use serde_yaml::Value;

let s: &str = "lorem";
let x: Value = s.into();

impl<'a> From<Cow<'a, str>> for Value

fn from(f: Cow<'a, str>) -> Self

Convert copy-on-write string to Value

Examples

use serde_yaml::Value;
use std::borrow::Cow;

let s: Cow<str> = Cow::Borrowed("lorem");
let x: Value = s.into();

use serde_yaml::Value;
use std::borrow::Cow;

let s: Cow<str> = Cow::Owned("lorem".to_string());
let x: Value = s.into();

impl From<Mapping> for Value

fn from(f: Mapping) -> Self

Convert map (with string keys) to Value

Examples

use serde_yaml::{Mapping, Value};

let mut m = Mapping::new();
m.insert("Lorem".into(), "ipsum".into());
let x: Value = m.into();

impl From<String> for Value

fn from(f: String) -> Self

Convert String to Value

Examples

use serde_yaml::Value;

let s: String = "lorem".to_string();
let x: Value = s.into();

impl<T: Into<Value>> From<Vec<T>> for Value

fn from(f: Vec<T>) -> Self

Convert a Vec to Value

Examples

use serde_yaml::Value;

let v = vec!["lorem", "ipsum", "dolor"];
let x: Value = v.into();

impl From<bool> for Value

fn from(f: bool) -> Self

Convert boolean to Value

Examples

use serde_yaml::Value;

let b = false;
let x: Value = b.into();

impl From<f32> for Value

fn from(n: f32) -> Self

Converts to this type from the input type.

impl From<f64> for Value

fn from(n: f64) -> Self

Converts to this type from the input type.

impl From<i16> for Value

fn from(n: i16) -> Self

Converts to this type from the input type.

impl From<i32> for Value

fn from(n: i32) -> Self

Converts to this type from the input type.

impl From<i64> for Value

fn from(n: i64) -> Self

Converts to this type from the input type.

impl From<i8> for Value

fn from(n: i8) -> Self

Converts to this type from the input type.

impl From<isize> for Value

fn from(n: isize) -> Self

Converts to this type from the input type.

impl From<u16> for Value

fn from(n: u16) -> Self

Converts to this type from the input type.

impl From<u32> for Value

fn from(n: u32) -> Self

Converts to this type from the input type.

impl From<u64> for Value

fn from(n: u64) -> Self

Converts to this type from the input type.

impl From<u8> for Value

fn from(n: u8) -> Self

Converts to this type from the input type.

impl From<usize> for Value

fn from(n: usize) -> Self

Converts to this type from the input type.

impl<T: Into<Value>> FromIterator<T> for Value

fn from_iter<I: IntoIterator<Item = T>>(iter: I) -> Self

Convert an iteratable type to a YAML sequence

Examples

use serde_yaml::Value;

let v = std::iter::repeat(42).take(5);
let x: Value = v.collect();

use serde_yaml::Value;

let v: Vec<_> = vec!["lorem", "ipsum", "dolor"];
let x: Value = v.into_iter().collect();

use std::iter::FromIterator;
use serde_yaml::Value;

let x: Value = Value::from_iter(vec!["lorem", "ipsum", "dolor"]);

impl Hash for Value

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

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<I> Index<I> for Value

where I: Index,

fn index(&self, index: I) -> &Value

Index into a serde_yaml::Value using the syntax value[0] or value["k"].

Returns Value::Null if the type of self does not match the type of the index, for example if the index is a string and self is a sequence or a number. Also returns Value::Null if the given key does not exist in the map or the given index is not within the bounds of the sequence.

For retrieving deeply nested values, you should have a look at the Value::pointer method.

Examples

let data: serde_yaml::Value = serde_yaml::from_str(r#"{ x: { y: [z, zz] } }"#)?;

assert_eq!(data["x"]["y"], serde_yaml::from_str::<Value>(r#"["z", "zz"]"#).unwrap());
assert_eq!(data["x"]["y"][0], serde_yaml::from_str::<Value>(r#""z""#).unwrap());

assert_eq!(data["a"], serde_yaml::from_str::<Value>(r#"null"#).unwrap()); // returns null for undefined values
assert_eq!(data["a"]["b"], serde_yaml::from_str::<Value>(r#"null"#).unwrap()); // does not panic

type Output = Value

The returned type after indexing.

impl<I> IndexMut<I> for Value

where I: Index,

fn index_mut(&mut self, index: I) -> &mut Value

Write into a serde_yaml::Value using the syntax value[0] = ... or value["k"] = ....

If the index is a number, the value must be a sequence of length bigger than the index. Indexing into a value that is not a sequence or a sequence that is too small will panic.

If the index is a string, the value must be an object or null which is treated like an empty object. If the key is not already present in the object, it will be inserted with a value of null. Indexing into a value that is neither an object nor null will panic.

Examples

let mut data: serde_yaml::Value = serde_yaml::from_str(r#"{x: 0}"#)?;

// replace an existing key
data["x"] = serde_yaml::from_str(r#"1"#)?;

// insert a new key
data["y"] = serde_yaml::from_str(r#"[false, false, false]"#)?;

// replace a value in a sequence
data["y"][0] = serde_yaml::from_str(r#"true"#)?;

// inserted a deeply nested key
data["a"]["b"]["c"]["d"] = serde_yaml::from_str(r#"true"#)?;

println!("{:?}", data);

impl<'de> IntoDeserializer<'de, Error> for Value

type Deserializer = Value

The type of the deserializer being converted into.

fn into_deserializer(self) -> Self::Deserializer

Convert this value into a deserializer.

impl<'a> PartialEq<&'a str> for Value

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

Compare &str with YAML value

Examples

assert!(Value::String("lorem".into()) == "lorem");

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.

impl PartialEq<String> for Value

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

Compare YAML value with String

Examples

assert!(Value::String("lorem".into()) == "lorem".to_string());

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.

impl PartialEq<bool> for Value

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

Compare YAML value with bool

Examples

assert!(Value::Bool(true) == true);

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.

impl<'a> PartialEq<f32> for &'a Value

fn eq(&self, other: &f32) -> bool

This method tests for self and other values to be equal, and is used by ==.

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.

impl<'a> PartialEq<f32> for &'a mut Value

fn eq(&self, other: &f32) -> bool

This method tests for self and other values to be equal, and is used by ==.

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.

impl PartialEq<f32> for Value

fn eq(&self, other: &f32) -> bool

This method tests for self and other values to be equal, and is used by ==.

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.

impl<'a> PartialEq<f64> for &'a Value

fn eq(&self, other: &f64) -> bool

This method tests for self and other values to be equal, and is used by ==.

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.

impl<'a> PartialEq<f64> for &'a mut Value

fn eq(&self, other: &f64) -> bool

This method tests for self and other values to be equal, and is used by ==.

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.

impl PartialEq<f64> for Value

fn eq(&self, other: &f64) -> bool

This method tests for self and other values to be equal, and is used by ==.

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.

impl<'a> PartialEq<i16> for &'a Value

fn eq(&self, other: &i16) -> bool

This method tests for self and other values to be equal, and is used by ==.

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.

impl<'a> PartialEq<i16> for &'a mut Value

fn eq(&self, other: &i16) -> bool

This method tests for self and other values to be equal, and is used by ==.

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.

impl PartialEq<i16> for Value

fn eq(&self, other: &i16) -> bool

This method tests for self and other values to be equal, and is used by ==.

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.

impl<'a> PartialEq<i32> for &'a Value

fn eq(&self, other: &i32) -> bool

This method tests for self and other values to be equal, and is used by ==.

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.

impl<'a> PartialEq<i32> for &'a mut Value

fn eq(&self, other: &i32) -> bool

This method tests for self and other values to be equal, and is used by ==.

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.

impl PartialEq<i32> for Value

fn eq(&self, other: &i32) -> bool

This method tests for self and other values to be equal, and is used by ==.

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.

impl<'a> PartialEq<i64> for &'a Value

fn eq(&self, other: &i64) -> bool

This method tests for self and other values to be equal, and is used by ==.

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.

impl<'a> PartialEq<i64> for &'a mut Value

fn eq(&self, other: &i64) -> bool

This method tests for self and other values to be equal, and is used by ==.

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.

impl PartialEq<i64> for Value

fn eq(&self, other: &i64) -> bool

This method tests for self and other values to be equal, and is used by ==.

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.

impl<'a> PartialEq<i8> for &'a Value

fn eq(&self, other: &i8) -> bool

This method tests for self and other values to be equal, and is used by ==.

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.

impl<'a> PartialEq<i8> for &'a mut Value

fn eq(&self, other: &i8) -> bool

This method tests for self and other values to be equal, and is used by ==.

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.

impl PartialEq<i8> for Value

fn eq(&self, other: &i8) -> bool

This method tests for self and other values to be equal, and is used by ==.

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.

impl<'a> PartialEq<isize> for &'a Value

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

This method tests for self and other values to be equal, and is used by ==.

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.

impl<'a> PartialEq<isize> for &'a mut Value

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

This method tests for self and other values to be equal, and is used by ==.

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.

impl PartialEq<isize> for Value

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

This method tests for self and other values to be equal, and is used by ==.

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.

impl PartialEq<str> for Value

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

Compare str with YAML value

Examples

assert!(Value::String("lorem".into()) == *"lorem");

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.

impl<'a> PartialEq<u16> for &'a Value

fn eq(&self, other: &u16) -> bool

This method tests for self and other values to be equal, and is used by ==.

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.

impl<'a> PartialEq<u16> for &'a mut Value

fn eq(&self, other: &u16) -> bool

This method tests for self and other values to be equal, and is used by ==.

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.

impl PartialEq<u16> for Value

fn eq(&self, other: &u16) -> bool

This method tests for self and other values to be equal, and is used by ==.

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.

impl<'a> PartialEq<u32> for &'a Value

fn eq(&self, other: &u32) -> bool

This method tests for self and other values to be equal, and is used by ==.

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.

impl<'a> PartialEq<u32> for &'a mut Value

fn eq(&self, other: &u32) -> bool

This method tests for self and other values to be equal, and is used by ==.

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.

impl PartialEq<u32> for Value

fn eq(&self, other: &u32) -> bool

This method tests for self and other values to be equal, and is used by ==.

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.

impl<'a> PartialEq<u64> for &'a Value

fn eq(&self, other: &u64) -> bool

This method tests for self and other values to be equal, and is used by ==.

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.

impl<'a> PartialEq<u64> for &'a mut Value

fn eq(&self, other: &u64) -> bool

This method tests for self and other values to be equal, and is used by ==.

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.

impl PartialEq<u64> for Value

fn eq(&self, other: &u64) -> bool

This method tests for self and other values to be equal, and is used by ==.

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.

impl<'a> PartialEq<u8> for &'a Value

fn eq(&self, other: &u8) -> bool

This method tests for self and other values to be equal, and is used by ==.

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.

impl<'a> PartialEq<u8> for &'a mut Value

fn eq(&self, other: &u8) -> bool

This method tests for self and other values to be equal, and is used by ==.

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.

impl PartialEq<u8> for Value

fn eq(&self, other: &u8) -> bool

This method tests for self and other values to be equal, and is used by ==.

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.

impl<'a> PartialEq<usize> for &'a Value

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

This method tests for self and other values to be equal, and is used by ==.

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.

impl<'a> PartialEq<usize> for &'a mut Value

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

This method tests for self and other values to be equal, and is used by ==.

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.

impl PartialEq<usize> for Value

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

This method tests for self and other values to be equal, and is used by ==.

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.

impl PartialEq for Value

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

This method tests for self and other values to be equal, and is used by ==.

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.

impl PartialOrd for Value

fn partial_cmp(&self, other: &Value) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl Serialize for Value

fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>

where S: Serializer,

Serialize this value into the given Serde serializer.

impl<'de> VariantAccess<'de> for &'de Value

type Error = Error

The error type that can be returned if some error occurs during deserialization. Must match the error type of our EnumAccess.

fn unit_variant(self) -> Result<(), Error>

Called when deserializing a variant with no values.

fn newtype_variant_seed<T>(self, seed: T) -> Result<T::Value, Error>

where T: DeserializeSeed<'de>,

Called when deserializing a variant with a single value.

fn tuple_variant<V>(self, _len: usize, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Called when deserializing a tuple-like variant.

fn struct_variant<V>( self, _fields: &'static [&'static str], visitor: V ) -> Result<V::Value, Error>

where V: Visitor<'de>,

Called when deserializing a struct-like variant.

fn newtype_variant<T>(self) -> Result<T, Self::Error>

where T: Deserialize<'de>,

Called when deserializing a variant with a single value.

impl<'de> VariantAccess<'de> for Value

type Error = Error

The error type that can be returned if some error occurs during deserialization. Must match the error type of our EnumAccess.

fn unit_variant(self) -> Result<(), Error>

Called when deserializing a variant with no values.

fn newtype_variant_seed<T>(self, seed: T) -> Result<T::Value, Error>

where T: DeserializeSeed<'de>,

Called when deserializing a variant with a single value.

fn tuple_variant<V>(self, _len: usize, visitor: V) -> Result<V::Value, Error>

where V: Visitor<'de>,

Called when deserializing a tuple-like variant.

fn struct_variant<V>( self, _fields: &'static [&'static str], visitor: V ) -> Result<V::Value, Error>

where V: Visitor<'de>,

Called when deserializing a struct-like variant.

fn newtype_variant<T>(self) -> Result<T, Self::Error>

where T: Deserialize<'de>,

Called when deserializing a variant with a single value.

impl Eq for Value

impl Index for Value

impl Index for Value

impl StructuralPartialEq for Value