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use nu_engine::CallExt;
use nu_protocol::ast::{Call, PathMember};
use nu_protocol::engine::{Command, EngineState, Stack};
use nu_protocol::{
Category, Example, IntoPipelineData, PipelineData, ShellError, Signature, SyntaxShape, Type,
Value,
};
#[derive(Clone)]
pub struct ToJson;
impl Command for ToJson {
fn name(&self) -> &str {
"to json"
}
fn signature(&self) -> Signature {
Signature::build("to json")
.input_output_types(vec![(Type::Any, Type::String)])
.switch("raw", "remove all of the whitespace", Some('r'))
.named(
"indent",
SyntaxShape::Number,
"specify indentation width",
Some('i'),
)
.named(
"tabs",
SyntaxShape::Number,
"specify indentation tab quantity",
Some('t'),
)
.category(Category::Formats)
}
fn usage(&self) -> &str {
"Converts table data into JSON text."
}
fn run(
&self,
engine_state: &EngineState,
stack: &mut Stack,
call: &Call,
input: PipelineData,
) -> Result<PipelineData, ShellError> {
let raw = call.has_flag("raw");
let use_tabs = call.has_flag("tabs");
let span = call.head;
let input = input.try_expand_range()?;
let value = input.into_value(span);
let json_value = value_to_json_value(&value)?;
let json_result = if raw {
nu_json::to_string_raw(&json_value)
} else if use_tabs {
let tab_count: usize = call.get_flag(engine_state, stack, "tabs")?.unwrap_or(1);
nu_json::to_string_with_tab_indentation(&json_value, tab_count)
} else {
let indent: usize = call.get_flag(engine_state, stack, "indent")?.unwrap_or(2);
nu_json::to_string_with_indent(&json_value, indent)
};
match json_result {
Ok(serde_json_string) => Ok(Value::String {
val: serde_json_string,
span,
}
.into_pipeline_data()),
_ => Ok(Value::Error {
error: Box::new(ShellError::CantConvert {
to_type: "JSON".into(),
from_type: value.get_type().to_string(),
span,
help: None,
}),
}
.into_pipeline_data()),
}
}
fn examples(&self) -> Vec<Example> {
vec![
Example {
description:
"Outputs a JSON string, with default indentation, representing the contents of this table",
example: "[a b c] | to json",
result: Some(Value::test_string("[\n \"a\",\n \"b\",\n \"c\"\n]")),
},
Example {
description:
"Outputs a JSON string, with 4-space indentation, representing the contents of this table",
example: "[Joe Bob Sam] | to json -i 4",
result: Some(Value::test_string("[\n \"Joe\",\n \"Bob\",\n \"Sam\"\n]")),
},
Example {
description:
"Outputs an unformatted JSON string representing the contents of this table",
example: "[1 2 3] | to json -r",
result: Some(Value::test_string("[1,2,3]")),
},
]
}
}
pub fn value_to_json_value(v: &Value) -> Result<nu_json::Value, ShellError> {
Ok(match v {
Value::Bool { val, .. } => nu_json::Value::Bool(*val),
Value::Filesize { val, .. } => nu_json::Value::I64(*val),
Value::Duration { val, .. } => nu_json::Value::I64(*val),
Value::Date { val, .. } => nu_json::Value::String(val.to_string()),
Value::Float { val, .. } => nu_json::Value::F64(*val),
Value::Int { val, .. } => nu_json::Value::I64(*val),
Value::Nothing { .. } => nu_json::Value::Null,
Value::String { val, .. } => nu_json::Value::String(val.to_string()),
Value::CellPath { val, .. } => nu_json::Value::Array(
val.members
.iter()
.map(|x| match &x {
PathMember::String { val, .. } => Ok(nu_json::Value::String(val.clone())),
PathMember::Int { val, .. } => Ok(nu_json::Value::U64(*val as u64)),
})
.collect::<Result<Vec<nu_json::Value>, ShellError>>()?,
),
Value::List { vals, .. } => nu_json::Value::Array(json_list(vals)?),
Value::Error { error } => return Err(*error.clone()),
Value::Closure { .. }
| Value::Block { .. }
| Value::Range { .. }
| Value::MatchPattern { .. } => nu_json::Value::Null,
Value::Binary { val, .. } => {
nu_json::Value::Array(val.iter().map(|x| nu_json::Value::U64(*x as u64)).collect())
}
Value::Record { cols, vals, .. } => {
let mut m = nu_json::Map::new();
for (k, v) in cols.iter().zip(vals) {
m.insert(k.clone(), value_to_json_value(v)?);
}
nu_json::Value::Object(m)
}
Value::LazyRecord { val, .. } => {
let collected = val.collect()?;
value_to_json_value(&collected)?
}
Value::CustomValue { val, span } => {
let collected = val.to_base_value(*span)?;
value_to_json_value(&collected)?
}
})
}
fn json_list(input: &[Value]) -> Result<Vec<nu_json::Value>, ShellError> {
let mut out = vec![];
for value in input {
out.push(value_to_json_value(value)?);
}
Ok(out)
}
#[cfg(test)]
mod test {
use super::*;
#[test]
fn test_examples() {
use crate::test_examples;
test_examples(ToJson {})
}
}