forked from extern/nushell
93 lines
2.8 KiB
Rust
93 lines
2.8 KiB
Rust
use crate::prelude::*;
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use log::trace;
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use nu_errors::{CoerceInto, ShellError};
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use nu_protocol::{Primitive, SpannedTypeName, UntaggedValue, Value};
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use nu_source::Tagged;
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pub trait ExtractType: Sized {
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fn extract(value: &Value) -> Result<Self, ShellError>;
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}
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impl<T: ExtractType> ExtractType for Tagged<T> {
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fn extract(value: &Value) -> Result<Tagged<T>, ShellError> {
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let name = std::any::type_name::<T>();
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trace!("<Tagged> Extracting {:?} for Tagged<{}>", value, name);
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Ok(T::extract(value)?.tagged(value.tag()))
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}
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}
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impl ExtractType for bool {
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fn extract(value: &Value) -> Result<bool, ShellError> {
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trace!("Extracting {:?} for bool", value);
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match &value {
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Value {
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value: UntaggedValue::Primitive(Primitive::Boolean(b)),
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..
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} => Ok(*b),
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Value {
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value: UntaggedValue::Primitive(Primitive::Nothing),
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..
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} => Ok(false),
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other => Err(ShellError::type_error("Boolean", other.spanned_type_name())),
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}
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}
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}
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impl ExtractType for std::path::PathBuf {
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fn extract(value: &Value) -> Result<std::path::PathBuf, ShellError> {
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trace!("Extracting {:?} for PathBuf", value);
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match &value {
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Value {
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value: UntaggedValue::Primitive(Primitive::Path(p)),
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..
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} => Ok(p.clone()),
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other => Err(ShellError::type_error("Path", other.spanned_type_name())),
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}
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}
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}
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impl ExtractType for i64 {
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fn extract(value: &Value) -> Result<i64, ShellError> {
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trace!("Extracting {:?} for i64", value);
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match &value {
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&Value {
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value: UntaggedValue::Primitive(Primitive::Int(int)),
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..
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} => Ok(int.tagged(&value.tag).coerce_into("converting to i64")?),
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other => Err(ShellError::type_error("Integer", other.spanned_type_name())),
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}
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}
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}
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impl ExtractType for u64 {
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fn extract(value: &Value) -> Result<u64, ShellError> {
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trace!("Extracting {:?} for u64", value);
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match &value {
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&Value {
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value: UntaggedValue::Primitive(Primitive::Int(int)),
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..
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} => Ok(int.tagged(&value.tag).coerce_into("converting to u64")?),
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other => Err(ShellError::type_error("Integer", other.spanned_type_name())),
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}
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}
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}
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impl ExtractType for String {
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fn extract(value: &Value) -> Result<String, ShellError> {
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trace!("Extracting {:?} for String", value);
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match value {
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Value {
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value: UntaggedValue::Primitive(Primitive::String(string)),
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..
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} => Ok(string.clone()),
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other => Err(ShellError::type_error("String", other.spanned_type_name())),
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}
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}
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}
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