nushell/src/commands/from_yaml.rs

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use crate::commands::WholeStreamCommand;
use crate::data::{value, TaggedDictBuilder};
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use crate::prelude::*;
use nu_errors::ShellError;
use nu_protocol::{Primitive, ReturnSuccess, Signature, UntaggedValue, Value};
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pub struct FromYAML;
impl WholeStreamCommand for FromYAML {
fn name(&self) -> &str {
"from-yaml"
}
fn signature(&self) -> Signature {
Signature::build("from-yaml")
}
fn usage(&self) -> &str {
"Parse text as .yaml/.yml and create table."
}
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fn run(
&self,
args: CommandArgs,
registry: &CommandRegistry,
) -> Result<OutputStream, ShellError> {
from_yaml(args, registry)
}
}
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pub struct FromYML;
impl WholeStreamCommand for FromYML {
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fn name(&self) -> &str {
"from-yml"
}
fn signature(&self) -> Signature {
Signature::build("from-yml")
}
fn usage(&self) -> &str {
"Parse text as .yaml/.yml and create table."
}
fn run(
&self,
args: CommandArgs,
registry: &CommandRegistry,
) -> Result<OutputStream, ShellError> {
from_yaml(args, registry)
}
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}
fn convert_yaml_value_to_nu_value(v: &serde_yaml::Value, tag: impl Into<Tag>) -> Value {
let tag = tag.into();
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match v {
serde_yaml::Value::Bool(b) => value::boolean(*b).into_value(tag),
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serde_yaml::Value::Number(n) if n.is_i64() => {
value::number(n.as_i64().unwrap()).into_value(tag)
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}
serde_yaml::Value::Number(n) if n.is_f64() => {
UntaggedValue::Primitive(Primitive::from(n.as_f64().unwrap())).into_value(tag)
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}
serde_yaml::Value::String(s) => value::string(s).into_value(tag),
serde_yaml::Value::Sequence(a) => UntaggedValue::Table(
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a.iter()
.map(|x| convert_yaml_value_to_nu_value(x, &tag))
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.collect(),
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)
.into_value(tag),
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serde_yaml::Value::Mapping(t) => {
let mut collected = TaggedDictBuilder::new(&tag);
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for (k, v) in t.iter() {
match k {
serde_yaml::Value::String(k) => {
collected.insert_value(k.clone(), convert_yaml_value_to_nu_value(v, &tag));
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}
_ => unimplemented!("Unknown key type"),
}
}
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collected.into_value()
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}
serde_yaml::Value::Null => UntaggedValue::Primitive(Primitive::Nothing).into_value(tag),
x => unimplemented!("Unsupported yaml case: {:?}", x),
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}
}
pub fn from_yaml_string_to_value(s: String, tag: impl Into<Tag>) -> serde_yaml::Result<Value> {
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let v: serde_yaml::Value = serde_yaml::from_str(&s)?;
Ok(convert_yaml_value_to_nu_value(&v, tag))
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}
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fn from_yaml(args: CommandArgs, registry: &CommandRegistry) -> Result<OutputStream, ShellError> {
let args = args.evaluate_once(registry)?;
let tag = args.name_tag();
let name_span = tag.span;
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let input = args.input;
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let stream = async_stream! {
let values: Vec<Value> = input.values.collect().await;
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let mut concat_string = String::new();
let mut latest_tag: Option<Tag> = None;
for value in values {
latest_tag = Some(value.tag.clone());
let value_span = value.tag.span;
if let Ok(s) = value.as_string() {
concat_string.push_str(&s);
}
else {
yield Err(ShellError::labeled_error_with_secondary(
"Expected a string from pipeline",
"requires string input",
name_span,
"value originates from here",
value_span,
))
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}
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}
match from_yaml_string_to_value(concat_string, tag.clone()) {
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Ok(x) => match x {
Value { value: UntaggedValue::Table(list), .. } => {
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for l in list {
yield ReturnSuccess::value(l);
}
}
x => yield ReturnSuccess::value(x),
},
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Err(_) => if let Some(last_tag) = latest_tag {
yield Err(ShellError::labeled_error_with_secondary(
"Could not parse as YAML",
"input cannot be parsed as YAML",
&tag,
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"value originates from here",
&last_tag,
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))
} ,
}
};
Ok(stream.to_output_stream())
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}