forked from extern/nushell
378 lines
12 KiB
Rust
378 lines
12 KiB
Rust
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use nu_protocol::Value::Filesize;
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use nu_protocol::{
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ast::Call,
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engine::{Command, EngineState, Stack},
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Example, PipelineData, ShellError, Signature, Span, Spanned, SyntaxShape, Value,
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};
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use bigdecimal::{BigDecimal, FromPrimitive};
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use nu_engine::CallExt;
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use num_bigint::{BigInt, BigUint, ToBigInt};
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use num_format::Locale;
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use num_traits::{Pow, Signed};
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use std::iter;
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// TODO num_format::SystemLocale once platform-specific dependencies are stable (see Cargo.toml)
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#[derive(Clone)]
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pub struct SubCommand;
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impl Command for SubCommand {
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fn name(&self) -> &str {
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"into string"
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}
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fn signature(&self) -> Signature {
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Signature::build("into string")
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// FIXME - need to support column paths
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// .rest(
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// "rest",
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// SyntaxShape::ColumnPaths(),
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// "column paths to convert to string (for table input)",
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// )
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.named(
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"decimals",
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SyntaxShape::Int,
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"decimal digits to which to round",
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Some('d'),
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)
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}
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fn usage(&self) -> &str {
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"Convert value to string"
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}
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fn run(
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&self,
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engine_state: &EngineState,
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stack: &mut Stack,
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call: &Call,
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input: PipelineData,
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) -> Result<nu_protocol::PipelineData, nu_protocol::ShellError> {
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string_helper(engine_state, stack, call, input)
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}
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fn examples(&self) -> Vec<Example> {
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vec![
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Example {
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description: "convert decimal to string and round to nearest integer",
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example: "1.7 | into string -d 0",
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result: Some(Value::String {
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val: "2".to_string(),
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span: Span::unknown(),
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}),
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},
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Example {
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description: "convert decimal to string",
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example: "1.7 | into string -d 1",
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result: Some(Value::String {
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val: "1.7".to_string(),
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span: Span::unknown(),
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}),
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},
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Example {
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description: "convert decimal to string and limit to 2 decimals",
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example: "1.734 | into string -d 2",
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result: Some(Value::String {
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val: "1.73".to_string(),
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span: Span::unknown(),
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}),
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},
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Example {
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description: "try to convert decimal to string and provide negative decimal points",
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example: "1.734 | into string -d -2",
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result: None,
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// FIXME
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// result: Some(Value::Error {
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// error: ShellError::UnsupportedInput(
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// String::from("Cannot accept negative integers for decimals arguments"),
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// Span::unknown(),
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// ),
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// }),
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},
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Example {
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description: "convert decimal to string",
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example: "4.3 | into string",
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result: Some(Value::String {
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val: "4.3".to_string(),
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span: Span::unknown(),
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}),
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},
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Example {
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description: "convert string to string",
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example: "'1234' | into string",
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result: Some(Value::String {
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val: "1234".to_string(),
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span: Span::unknown(),
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}),
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},
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Example {
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description: "convert boolean to string",
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example: "$true | into string",
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result: Some(Value::String {
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val: "true".to_string(),
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span: Span::unknown(),
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}),
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},
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Example {
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description: "convert date to string",
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example: "date now | into string",
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result: None,
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},
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Example {
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description: "convert filepath to string",
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example: "ls Cargo.toml | get name | into string",
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result: None,
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},
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Example {
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description: "convert filesize to string",
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example: "ls Cargo.toml | get size | into string",
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result: None,
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},
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]
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}
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}
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fn string_helper(
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engine_state: &EngineState,
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stack: &mut Stack,
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call: &Call,
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input: PipelineData,
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) -> Result<nu_protocol::PipelineData, ShellError> {
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let decimals = call.has_flag("decimals");
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let head = call.head;
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let decimals_value: Option<i64> = call.get_flag(engine_state, stack, "decimals")?;
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if decimals && decimals_value.is_some() && decimals_value.unwrap().is_negative() {
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return Err(ShellError::UnsupportedInput(
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"Cannot accept negative integers for decimals arguments".to_string(),
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head,
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));
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}
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input.map(
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move |v| action(v, head, decimals, decimals_value, false),
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engine_state.ctrlc.clone(),
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)
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}
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pub fn action(
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input: Value,
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head: Span,
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decimals: bool,
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digits: Option<i64>,
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group_digits: bool,
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) -> Value {
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match input {
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Value::Int { val, span } => {
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let res = if group_digits {
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format_int(val) // int.to_formatted_string(*locale)
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} else {
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val.to_string()
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};
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Value::String {
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val: res,
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span: head,
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}
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}
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Value::Float { val, span } => {
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if decimals {
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let dec = BigDecimal::from_f64(val);
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let decimal_value = digits.unwrap() as u64;
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match dec {
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Some(x) => Value::String {
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val: format_decimal(x, Some(decimal_value), group_digits),
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span,
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},
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None => Value::Error {
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error: ShellError::CantConvert(
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String::from(format!("cannot convert {}to BigDecimal", val)),
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head,
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),
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},
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}
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} else {
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Value::String {
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val: val.to_string(),
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span: head,
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}
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}
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}
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// We do not seem to have BigInt at the moment as a Value Type
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// Value::BigInt { val, span } => {
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// let res = if group_digits {
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// format_bigint(val) // int.to_formatted_string(*locale)
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// } else {
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// int.to_string()
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// };
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// Value::String {
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// val: res,
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// span: head,
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// }
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// .into_pipeline_data()
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// }
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Value::Bool { val, span } => Value::String {
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val: val.to_string(),
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span: head,
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},
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Value::Date { val, span } => Value::String {
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val: val.format("%c").to_string(),
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span: head,
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},
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Value::String { val, span } => Value::String { val, span: head },
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// FIXME - we do not have a FilePath type anymore. Do we need to support this?
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// Value::FilePath(a_filepath) => a_filepath.as_path().display().to_string(),
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Value::Filesize { val, span } => {
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// let byte_string = InlineShape::format_bytes(*val, None);
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// Ok(Value::String {
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// val: byte_string.1,
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// span,
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// }
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Value::String {
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val: input.into_string(),
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span: head,
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}
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}
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Value::Nothing { span } => Value::String {
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val: "nothing".to_string(),
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span: head,
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},
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Value::Record { cols, vals, span } => Value::Error {
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error: ShellError::UnsupportedInput(
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"Cannot convert Record into string".to_string(),
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head,
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),
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},
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_ => Value::Error {
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error: ShellError::CantConvert(
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String::from(" into string. Probably this type is not supported yet"),
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head,
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),
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},
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}
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}
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fn format_int(int: i64) -> String {
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int.to_string()
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// TODO once platform-specific dependencies are stable (see Cargo.toml)
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// #[cfg(windows)]
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// {
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// int.to_formatted_string(&Locale::en)
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// }
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// #[cfg(not(windows))]
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// {
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// match SystemLocale::default() {
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// Ok(locale) => int.to_formatted_string(&locale),
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// Err(_) => int.to_formatted_string(&Locale::en),
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// }
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// }
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}
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fn format_bigint(int: &BigInt) -> String {
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int.to_string()
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// TODO once platform-specific dependencies are stable (see Cargo.toml)
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// #[cfg(windows)]
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// {
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// int.to_formatted_string(&Locale::en)
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// }
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// #[cfg(not(windows))]
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// {
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// match SystemLocale::default() {
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// Ok(locale) => int.to_formatted_string(&locale),
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// Err(_) => int.to_formatted_string(&Locale::en),
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// }
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// }
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}
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fn format_decimal(mut decimal: BigDecimal, digits: Option<u64>, group_digits: bool) -> String {
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if let Some(n) = digits {
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decimal = round_decimal(&decimal, n)
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}
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if decimal.is_integer() && (digits.is_none() || digits == Some(0)) {
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let int = decimal.as_bigint_and_exponent().0;
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// .expect("integer BigDecimal should convert to BigInt");
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return if group_digits {
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int.to_string()
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} else {
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format_bigint(&int)
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};
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}
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let (int, exp) = decimal.as_bigint_and_exponent();
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let factor = BigInt::from(10).pow(BigUint::from(exp as u64)); // exp > 0 for non-int decimal
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let int_part = &int / &factor;
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let dec_part = (&int % &factor)
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.abs()
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.to_biguint()
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.expect("BigInt::abs should always produce positive signed BigInt and thus BigUInt")
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.to_str_radix(10);
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let dec_str = if let Some(n) = digits {
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dec_part
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.chars()
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.chain(iter::repeat('0'))
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.take(n as usize)
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.collect()
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} else {
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String::from(dec_part.trim_end_matches('0'))
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};
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let format_default_loc = |int_part: BigInt| {
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let loc = Locale::en;
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//TODO: when num_format is available for recent bigint, replace this with the locale-based format
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let (int_str, sep) = (int_part.to_string(), String::from(loc.decimal()));
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format!("{}{}{}", int_str, sep, dec_str)
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};
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format_default_loc(int_part)
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// TODO once platform-specific dependencies are stable (see Cargo.toml)
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// #[cfg(windows)]
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// {
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// format_default_loc(int_part)
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// }
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// #[cfg(not(windows))]
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// {
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// match SystemLocale::default() {
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// Ok(sys_loc) => {
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// let int_str = int_part.to_formatted_string(&sys_loc);
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// let sep = String::from(sys_loc.decimal());
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// format!("{}{}{}", int_str, sep, dec_str)
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// }
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// Err(_) => format_default_loc(int_part),
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// }
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// }
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}
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fn round_decimal(decimal: &BigDecimal, mut digits: u64) -> BigDecimal {
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let mut mag = decimal.clone();
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while mag >= BigDecimal::from(1) {
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mag = mag / 10;
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digits += 1;
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}
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decimal.with_prec(digits)
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}
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#[cfg(test)]
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mod test {
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use super::*;
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#[test]
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fn test_examples() {
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use crate::test_examples;
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test_examples(SubCommand {})
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}
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}
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