nushell/src/commands/to_json.rs

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Rust
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use crate::commands::WholeStreamCommand;
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use crate::object::{Primitive, Value};
use crate::prelude::*;
pub struct ToJSON;
impl WholeStreamCommand for ToJSON {
fn name(&self) -> &str {
"to-json"
}
fn signature(&self) -> Signature {
Signature::build("to-json")
}
fn usage(&self) -> &str {
"Convert table into .json text"
}
fn run(
&self,
args: CommandArgs,
registry: &CommandRegistry,
) -> Result<OutputStream, ShellError> {
to_json(args, registry)
}
}
pub fn value_to_json_value(v: &Tagged<Value>) -> Result<serde_json::Value, ShellError> {
Ok(match v.item() {
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Value::Primitive(Primitive::Boolean(b)) => serde_json::Value::Bool(*b),
Value::Primitive(Primitive::Bytes(b)) => serde_json::Value::Number(
serde_json::Number::from(b.to_u64().expect("What about really big numbers")),
),
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Value::Primitive(Primitive::Date(d)) => serde_json::Value::String(d.to_string()),
Value::Primitive(Primitive::EndOfStream) => serde_json::Value::Null,
Value::Primitive(Primitive::BeginningOfStream) => serde_json::Value::Null,
Value::Primitive(Primitive::Decimal(f)) => serde_json::Value::Number(
serde_json::Number::from_f64(
f.to_f64().expect("TODO: What about really big decimals?"),
)
.unwrap(),
),
Value::Primitive(Primitive::Int(i)) => serde_json::Value::Number(serde_json::Number::from(
CoerceInto::<i64>::coerce_into(i.tagged(v.tag), "converting to JSON number")?,
)),
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Value::Primitive(Primitive::Nothing) => serde_json::Value::Null,
Value::Primitive(Primitive::String(s)) => serde_json::Value::String(s.clone()),
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Value::Primitive(Primitive::Path(s)) => serde_json::Value::String(s.display().to_string()),
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Value::List(l) => serde_json::Value::Array(json_list(l)?),
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Value::Block(_) => serde_json::Value::Null,
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Value::Binary(b) => serde_json::Value::Array(
b.iter()
.map(|x| {
serde_json::Value::Number(serde_json::Number::from_f64(*x as f64).unwrap())
})
.collect(),
),
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Value::Object(o) => {
let mut m = serde_json::Map::new();
for (k, v) in o.entries.iter() {
m.insert(k.clone(), value_to_json_value(v)?);
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}
serde_json::Value::Object(m)
}
})
}
fn json_list(input: &Vec<Tagged<Value>>) -> Result<Vec<serde_json::Value>, ShellError> {
let mut out = vec![];
for value in input {
out.push(value_to_json_value(value)?);
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}
Ok(out)
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}
fn to_json(args: CommandArgs, registry: &CommandRegistry) -> Result<OutputStream, ShellError> {
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let args = args.evaluate_once(registry)?;
let name_span = args.name_span();
let stream = async_stream_block! {
let input: Vec<Tagged<Value>> = args.input.values.collect().await;
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let to_process_input = if input.len() > 1 {
let tag = input[0].tag;
vec![Tagged { item: Value::List(input), tag } ]
} else if input.len() == 1 {
input
} else {
vec![]
};
for value in to_process_input {
match value_to_json_value(&value) {
Ok(json_value) => {
match serde_json::to_string(&json_value) {
Ok(x) => yield ReturnSuccess::value(
Value::Primitive(Primitive::String(x)).simple_spanned(name_span),
),
_ => yield Err(ShellError::labeled_error_with_secondary(
"Expected an object with JSON-compatible structure.span() from pipeline",
"requires JSON-compatible input",
name_span,
"originates from here".to_string(),
value.span(),
)),
}
}
_ => yield Err(ShellError::labeled_error(
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"Expected an object with JSON-compatible structure from pipeline",
"requires JSON-compatible input",
name_span))
}
}
};
Ok(stream.to_output_stream())
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}