nu-data 0.27.1

CLI for nushell
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87

use log::trace;
use nu_errors::{CoerceInto, ShellError};
use nu_protocol::{Primitive, SpannedTypeName, UntaggedValue, Value};
use nu_source::{Tagged, TaggedItem};

pub trait ExtractType: Sized {
    fn extract(value: &Value) -> Result<Self, ShellError>;
}

impl<T: ExtractType> ExtractType for Tagged<T> {
    fn extract(value: &Value) -> Result<Tagged<T>, ShellError> {
        let name = std::any::type_name::<T>();
        trace!("<Tagged> Extracting {:?} for Tagged<{}>", value, name);

        Ok(T::extract(value)?.tagged(value.tag()))
    }
}

impl ExtractType for bool {
    fn extract(value: &Value) -> Result<bool, ShellError> {
        trace!("Extracting {:?} for bool", value);

        match &value {
            Value {
                value: UntaggedValue::Primitive(Primitive::Boolean(b)),
                ..
            } => Ok(*b),
            other => Err(ShellError::type_error("Boolean", other.spanned_type_name())),
        }
    }
}

impl ExtractType for std::path::PathBuf {
    fn extract(value: &Value) -> Result<std::path::PathBuf, ShellError> {
        trace!("Extracting {:?} for PathBuf", value);

        match &value {
            Value {
                value: UntaggedValue::Primitive(Primitive::FilePath(p)),
                ..
            } => Ok(p.clone()),
            other => Err(ShellError::type_error("Path", other.spanned_type_name())),
        }
    }
}

impl ExtractType for i64 {
    fn extract(value: &Value) -> Result<i64, ShellError> {
        trace!("Extracting {:?} for i64", value);

        match &value {
            &Value {
                value: UntaggedValue::Primitive(Primitive::Int(int)),
                ..
            } => Ok(int.tagged(&value.tag).coerce_into("converting to i64")?),
            other => Err(ShellError::type_error("Integer", other.spanned_type_name())),
        }
    }
}

impl ExtractType for u64 {
    fn extract(value: &Value) -> Result<u64, ShellError> {
        trace!("Extracting {:?} for u64", value);

        match &value {
            &Value {
                value: UntaggedValue::Primitive(Primitive::Int(int)),
                ..
            } => Ok(int.tagged(&value.tag).coerce_into("converting to u64")?),
            other => Err(ShellError::type_error("Integer", other.spanned_type_name())),
        }
    }
}

impl ExtractType for String {
    fn extract(value: &Value) -> Result<String, ShellError> {
        trace!("Extracting {:?} for String", value);

        match value {
            Value {
                value: UntaggedValue::Primitive(Primitive::String(string)),
                ..
            } => Ok(string.clone()),
            other => Err(ShellError::type_error("String", other.spanned_type_name())),
        }
    }
}