Trait FromKv 

pub trait FromKv: Sized {
    // Required method
    fn from_kv(value: &str, span: Span) -> Result<Self>;
}

Trait for types that can be parsed from a KEY=VALUE string.

This is the extension point for custom types. Implement this trait to allow your type to be used in a #[derive(Kv)] struct.

The span parameter indicates where in the input the value is located, for error reporting.

Example

use pkgsrc_kv::{FromKv, KvError, Span};

struct MyId(u32);

impl FromKv for MyId {
    fn from_kv(value: &str, span: Span) -> Result<Self, KvError> {
        value.parse::<u32>()
            .map(MyId)
            .map_err(|e| KvError::Parse {
                message: e.to_string(),
                span,
            })
    }
}

Required Methods

fn from_kv(value: &str, span: Span) -> Result<Self>

Parse a value from a string.

Errors

Returns an error if the value cannot be parsed into the target type.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementations on Foreign Types

impl FromKv for PathBuf

fn from_kv(value: &str, _span: Span) -> Result<Self>

impl FromKv for String

fn from_kv(value: &str, _span: Span) -> Result<Self>

impl FromKv for bool

fn from_kv(value: &str, span: Span) -> Result<Self>

impl FromKv for i8

fn from_kv(value: &str, span: Span) -> Result<Self>

impl FromKv for i16

fn from_kv(value: &str, span: Span) -> Result<Self>

impl FromKv for i32

fn from_kv(value: &str, span: Span) -> Result<Self>

impl FromKv for i64

fn from_kv(value: &str, span: Span) -> Result<Self>

impl FromKv for isize

fn from_kv(value: &str, span: Span) -> Result<Self>

impl FromKv for u8

fn from_kv(value: &str, span: Span) -> Result<Self>

impl FromKv for u16

fn from_kv(value: &str, span: Span) -> Result<Self>

impl FromKv for u32

fn from_kv(value: &str, span: Span) -> Result<Self>

impl FromKv for u64

fn from_kv(value: &str, span: Span) -> Result<Self>

impl FromKv for usize

fn from_kv(value: &str, span: Span) -> Result<Self>

impl<T: FromKv> FromKv for Vec<T>

fn from_kv(value: &str, span: Span) -> Result<Self>

Implementors