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Add str.__format__
  • Loading branch information
coolreader18 committed Apr 2, 2020
commit dd92e9036655bebd3ed9cfdedbebe1a3b764a32f
13 changes: 10 additions & 3 deletions vm/src/format.rs
Original file line number Diff line number Diff line change
Expand Up @@ -422,7 +422,7 @@ impl FormatSpec {
}
};

self.format_sign_and_align(magnitude_string, sign_str)
self.format_sign_and_align(&magnitude_string, sign_str)
}

pub fn format_int(&self, num: &BigInt) -> Result<String, &'static str> {
Expand Down Expand Up @@ -486,12 +486,19 @@ impl FormatSpec {
},
};

self.format_sign_and_align(magnitude_string, sign_str)
self.format_sign_and_align(&magnitude_string, sign_str)
}

pub fn format_string(&self, s: &str) -> Result<String, &'static str> {
match self.format_type {
Some(FormatType::String) | None => self.format_sign_and_align(s, ""),
_ => Err("Unknown format code for object of type 'str'"),
}
}

fn format_sign_and_align(
&self,
magnitude_string: String,
magnitude_string: &str,
sign_str: &str,
) -> Result<String, &'static str> {
let align = self.align.unwrap_or(FormatAlign::Right);
Expand Down
12 changes: 11 additions & 1 deletion vm/src/obj/objstr.rs
Original file line number Diff line number Diff line change
Expand Up @@ -26,7 +26,7 @@ use crate::cformat::{
CFormatPart, CFormatPreconversor, CFormatQuantity, CFormatSpec, CFormatString, CFormatType,
CNumberType,
};
use crate::format::{FormatParseError, FormatPart, FormatPreconversor, FormatString};
use crate::format::{FormatParseError, FormatPart, FormatPreconversor, FormatSpec, FormatString};
use crate::function::{single_or_tuple_any, OptionalArg, PyFuncArgs};
use crate::pyhash;
use crate::pyobject::{
Expand Down Expand Up @@ -727,6 +727,16 @@ impl PyString {
}
}

#[pymethod(name = "__format__")]
fn format_str(&self, spec: PyStringRef, vm: &VirtualMachine) -> PyResult<String> {
match FormatSpec::parse(spec.as_str())
.and_then(|format_spec| format_spec.format_string(&self.value))
{
Ok(string) => Ok(string),
Err(err) => Err(vm.new_value_error(err.to_string())),
}
}

/// Return a titlecased version of the string where words start with an
/// uppercase character and the remaining characters are lowercase.
#[pymethod]
Expand Down