use nu_engine::CallExt;
use nu_protocol::{
ast::{Call, CellPath},
engine::{Command, EngineState, Stack},
Category, Example, PipelineData, ShellError, Signature, Span, SyntaxShape, Value,
};
struct Arguments {
radix: Option<Value>,
column_paths: Vec<CellPath>,
}
#[derive(Clone)]
pub struct SubCommand;
impl Command for SubCommand {
fn name(&self) -> &str {
"into int"
}
fn signature(&self) -> Signature {
Signature::build("into int")
.named("radix", SyntaxShape::Number, "radix of integer", Some('r'))
.rest(
"rest",
SyntaxShape::CellPath,
"column paths to convert to int (for table input)",
)
.category(Category::Conversions)
}
fn usage(&self) -> &str {
"Convert value to integer"
}
fn search_terms(&self) -> Vec<&str> {
vec!["convert", "number", "natural"]
}
fn run(
&self,
engine_state: &EngineState,
stack: &mut Stack,
call: &Call,
input: PipelineData,
) -> Result<nu_protocol::PipelineData, nu_protocol::ShellError> {
into_int(engine_state, stack, call, input)
}
fn examples(&self) -> Vec<Example> {
vec![
Example {
description: "Convert string to integer in table",
example: "echo [[num]; ['-5'] [4] [1.5]] | into int num",
result: None,
},
Example {
description: "Convert string to integer",
example: "'2' | into int",
result: Some(Value::test_int(2)),
},
Example {
description: "Convert decimal to integer",
example: "5.9 | into int",
result: Some(Value::test_int(5)),
},
Example {
description: "Convert decimal string to integer",
example: "'5.9' | into int",
result: Some(Value::test_int(5)),
},
Example {
description: "Convert file size to integer",
example: "4KB | into int",
result: Some(Value::Int {
val: 4000,
span: Span::test_data(),
}),
},
Example {
description: "Convert bool to integer",
example: "[false, true] | into int",
result: Some(Value::List {
vals: vec![Value::test_int(0), Value::test_int(1)],
span: Span::test_data(),
}),
},
Example {
description: "Convert to integer from binary",
example: "'1101' | into int -r 2",
result: Some(Value::test_int(13)),
},
Example {
description: "Convert to integer from hex",
example: "'FF' | into int -r 16",
result: Some(Value::test_int(255)),
},
]
}
}
fn into_int(
engine_state: &EngineState,
stack: &mut Stack,
call: &Call,
input: PipelineData,
) -> Result<nu_protocol::PipelineData, nu_protocol::ShellError> {
let head = call.head;
let options = Arguments {
radix: call.get_flag(engine_state, stack, "radix")?,
column_paths: call.rest(engine_state, stack, 0)?,
};
let radix: u32 = match options.radix {
Some(Value::Int { val, .. }) => val as u32,
Some(_) => 10,
None => 10,
};
if let Some(val) = &options.radix {
if !(2..=36).contains(&radix) {
return Err(ShellError::UnsupportedInput(
"Radix must lie in the range [2, 36]".to_string(),
val.span()?,
));
}
}
input.map(
move |v| {
if options.column_paths.is_empty() {
action(&v, head, radix)
} else {
let mut ret = v;
for path in &options.column_paths {
let r = ret.update_cell_path(
&path.members,
Box::new(move |old| action(old, head, radix)),
);
if let Err(error) = r {
return Value::Error { error };
}
}
ret
}
},
engine_state.ctrlc.clone(),
)
}
pub fn action(input: &Value, span: Span, radix: u32) -> Value {
match input {
Value::Int { val: _, .. } => {
if radix == 10 {
input.clone()
} else {
convert_int(input, span, radix)
}
}
Value::Filesize { val, .. } => Value::Int { val: *val, span },
Value::Float { val, .. } => Value::Int {
val: *val as i64,
span,
},
Value::String { val, .. } => {
if radix == 10 {
match int_from_string(val, span) {
Ok(val) => Value::Int { val, span },
Err(error) => Value::Error { error },
}
} else {
convert_int(input, span, radix)
}
}
Value::Bool { val, .. } => {
if *val {
Value::Int { val: 1, span }
} else {
Value::Int { val: 0, span }
}
}
_ => Value::Error {
error: ShellError::UnsupportedInput("'into int' for unsupported type".into(), span),
},
}
}
fn convert_int(input: &Value, head: Span, radix: u32) -> Value {
let i = match input {
Value::Int { val, .. } => val.to_string(),
Value::String { val, .. } => {
if val.starts_with("0x") || val.starts_with("0b") {
match int_from_string(val, head) {
Ok(x) => return Value::Int { val: x, span: head },
Err(e) => return Value::Error { error: e },
}
}
val.to_string()
}
_ => {
return Value::Error {
error: ShellError::UnsupportedInput(
"only strings or integers are supported".to_string(),
head,
),
}
}
};
match i64::from_str_radix(&i, radix) {
Ok(n) => Value::Int { val: n, span: head },
Err(_reason) => Value::Error {
error: ShellError::CantConvert("int".to_string(), "string".to_string(), head, None),
},
}
}
fn int_from_string(a_string: &str, span: Span) -> Result<i64, ShellError> {
let trimmed = a_string.trim();
match trimmed {
b if b.starts_with("0b") => {
let num = match i64::from_str_radix(b.trim_start_matches("0b"), 2) {
Ok(n) => n,
Err(_reason) => {
return Err(ShellError::CantConvert(
"int".to_string(),
"string".to_string(),
span,
Some(r#"digits following "0b" can only be 0 or 1"#.to_string()),
))
}
};
Ok(num)
}
h if h.starts_with("0x") => {
let num =
match i64::from_str_radix(h.trim_start_matches("0x"), 16) {
Ok(n) => n,
Err(_reason) => return Err(ShellError::CantConvert(
"int".to_string(),
"string".to_string(),
span,
Some(
r#"hexadecimal digits following "0x" should be in 0-9, a-f, or A-F"#
.to_string(),
),
)),
};
Ok(num)
}
_ => match a_string.parse::<i64>() {
Ok(n) => Ok(n),
Err(_) => match a_string.parse::<f64>() {
Ok(f) => Ok(f as i64),
_ => Err(ShellError::CantConvert(
"int".to_string(),
"string".to_string(),
span,
None,
)),
},
},
}
}
#[cfg(test)]
mod test {
use super::Value;
use super::*;
use nu_protocol::Type::Error;
#[test]
fn test_examples() {
use crate::test_examples;
test_examples(SubCommand {})
}
#[test]
fn turns_to_integer() {
let word = Value::test_string("10");
let expected = Value::test_int(10);
let actual = action(&word, Span::test_data(), 10);
assert_eq!(actual, expected);
}
#[test]
fn turns_binary_to_integer() {
let s = Value::test_string("0b101");
let actual = action(&s, Span::test_data(), 10);
assert_eq!(actual, Value::test_int(5));
}
#[test]
fn turns_hex_to_integer() {
let s = Value::test_string("0xFF");
let actual = action(&s, Span::test_data(), 16);
assert_eq!(actual, Value::test_int(255));
}
#[test]
fn communicates_parsing_error_given_an_invalid_integerlike_string() {
let integer_str = Value::test_string("36anra");
let actual = action(&integer_str, Span::test_data(), 10);
assert_eq!(actual.get_type(), Error)
}
}