nushell/src/commands/from_yaml.rs

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use crate::commands::WholeStreamCommand;
use crate::data::{Primitive, TaggedDictBuilder, Value};
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use crate::prelude::*;
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>) -> Tagged<Value> {
let tag = tag.into();
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match v {
serde_yaml::Value::Bool(b) => Value::boolean(*b).tagged(tag),
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serde_yaml::Value::Number(n) if n.is_i64() => {
Value::number(n.as_i64().unwrap()).tagged(tag)
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}
serde_yaml::Value::Number(n) if n.is_f64() => {
Value::Primitive(Primitive::from(n.as_f64().unwrap())).tagged(tag)
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}
serde_yaml::Value::String(s) => Value::string(s).tagged(tag),
serde_yaml::Value::Sequence(a) => Value::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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)
.tagged(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_tagged(k.clone(), convert_yaml_value_to_nu_value(v, tag));
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}
_ => unimplemented!("Unknown key type"),
}
}
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collected.into_tagged_value()
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}
serde_yaml::Value::Null => Value::Primitive(Primitive::Nothing).tagged(tag),
x => unimplemented!("Unsupported yaml case: {:?}", x),
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}
}
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pub fn from_yaml_string_to_value(
s: String,
tag: impl Into<Tag>,
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) -> serde_yaml::Result<Tagged<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 span = args.name_span();
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let input = args.input;
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let stream = async_stream_block! {
let values: Vec<Tagged<Value>> = input.values.collect().await;
let mut concat_string = String::new();
let mut latest_tag: Option<Tag> = None;
for value in values {
let value_tag = value.tag();
latest_tag = Some(value_tag);
match value.item {
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Value::Primitive(Primitive::String(s)) => {
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concat_string.push_str(&s);
concat_string.push_str("\n");
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}
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_ => yield Err(ShellError::labeled_error_with_secondary(
"Expected a string from pipeline",
"requires string input",
span,
"value originates from here",
value_tag.span,
)),
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}
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}
match from_yaml_string_to_value(concat_string, span) {
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Ok(x) => match x {
Tagged { item: Value::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",
span,
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"value originates from here",
last_tag.span,
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))
} ,
}
};
Ok(stream.to_output_stream())
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}