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1044 lines (968 loc) · 31.2 KB
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//! Implementation of Printf-Style string formatting
//! as per the [Python Docs](https://docs.python.org/3/library/stdtypes.html#printf-style-string-formatting).
use bitflags::bitflags;
use num_bigint::{BigInt, Sign};
use num_traits::Signed;
use rustpython_literal::{float, format::Case};
use std::{
cmp, fmt,
iter::{Enumerate, Peekable},
str::FromStr,
};
#[derive(Debug, PartialEq)]
pub enum CFormatErrorType {
UnmatchedKeyParentheses,
MissingModuloSign,
UnsupportedFormatChar(char),
IncompleteFormat,
IntTooBig,
// Unimplemented,
}
// also contains how many chars the parsing function consumed
pub type ParsingError = (CFormatErrorType, usize);
#[derive(Debug, PartialEq)]
pub struct CFormatError {
pub typ: CFormatErrorType, // FIXME
pub index: usize,
}
impl fmt::Display for CFormatError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
use CFormatErrorType::*;
match self.typ {
UnmatchedKeyParentheses => write!(f, "incomplete format key"),
IncompleteFormat => write!(f, "incomplete format"),
UnsupportedFormatChar(c) => write!(
f,
"unsupported format character '{}' ({:#x}) at index {}",
c, c as u32, self.index
),
IntTooBig => write!(f, "width/precision too big"),
_ => write!(f, "unexpected error parsing format string"),
}
}
}
pub type CFormatConversion = super::format::FormatConversion;
#[derive(Debug, PartialEq)]
pub enum CNumberType {
Decimal,
Octal,
Hex(Case),
}
#[derive(Debug, PartialEq)]
pub enum CFloatType {
Exponent(Case),
PointDecimal(Case),
General(Case),
}
#[derive(Debug, PartialEq)]
pub enum CFormatType {
Number(CNumberType),
Float(CFloatType),
Character,
String(CFormatConversion),
}
#[derive(Debug, PartialEq)]
pub enum CFormatPrecision {
Quantity(CFormatQuantity),
Dot,
}
impl From<CFormatQuantity> for CFormatPrecision {
fn from(quantity: CFormatQuantity) -> Self {
CFormatPrecision::Quantity(quantity)
}
}
bitflags! {
#[derive(Copy, Clone, Debug, PartialEq)]
pub struct CConversionFlags: u32 {
const ALTERNATE_FORM = 0b0000_0001;
const ZERO_PAD = 0b0000_0010;
const LEFT_ADJUST = 0b0000_0100;
const BLANK_SIGN = 0b0000_1000;
const SIGN_CHAR = 0b0001_0000;
}
}
impl CConversionFlags {
#[inline]
pub fn sign_string(&self) -> &'static str {
if self.contains(CConversionFlags::SIGN_CHAR) {
"+"
} else if self.contains(CConversionFlags::BLANK_SIGN) {
" "
} else {
""
}
}
}
#[derive(Debug, PartialEq)]
pub enum CFormatQuantity {
Amount(usize),
FromValuesTuple,
}
#[derive(Debug, PartialEq)]
pub struct CFormatSpec {
pub mapping_key: Option<String>,
pub flags: CConversionFlags,
pub min_field_width: Option<CFormatQuantity>,
pub precision: Option<CFormatPrecision>,
pub format_type: CFormatType,
pub format_char: char,
// chars_consumed: usize,
}
impl FromStr for CFormatSpec {
type Err = ParsingError;
fn from_str(text: &str) -> Result<Self, Self::Err> {
let mut chars = text.chars().enumerate().peekable();
if chars.next().map(|x| x.1) != Some('%') {
return Err((CFormatErrorType::MissingModuloSign, 1));
}
CFormatSpec::parse(&mut chars)
}
}
pub type ParseIter<I> = Peekable<Enumerate<I>>;
impl CFormatSpec {
pub fn parse<T, I>(iter: &mut ParseIter<I>) -> Result<Self, ParsingError>
where
T: Into<char> + Copy,
I: Iterator<Item = T>,
{
let mapping_key = parse_spec_mapping_key(iter)?;
let flags = parse_flags(iter);
let min_field_width = parse_quantity(iter)?;
let precision = parse_precision(iter)?;
consume_length(iter);
let (format_type, format_char) = parse_format_type(iter)?;
Ok(CFormatSpec {
mapping_key,
flags,
min_field_width,
precision,
format_type,
format_char,
})
}
fn compute_fill_string(fill_char: char, fill_chars_needed: usize) -> String {
(0..fill_chars_needed)
.map(|_| fill_char)
.collect::<String>()
}
fn fill_string(
&self,
string: String,
fill_char: char,
num_prefix_chars: Option<usize>,
) -> String {
let mut num_chars = string.chars().count();
if let Some(num_prefix_chars) = num_prefix_chars {
num_chars += num_prefix_chars;
}
let num_chars = num_chars;
let width = match &self.min_field_width {
Some(CFormatQuantity::Amount(width)) => cmp::max(width, &num_chars),
_ => &num_chars,
};
let fill_chars_needed = width.saturating_sub(num_chars);
let fill_string = CFormatSpec::compute_fill_string(fill_char, fill_chars_needed);
if !fill_string.is_empty() {
if self.flags.contains(CConversionFlags::LEFT_ADJUST) {
format!("{string}{fill_string}")
} else {
format!("{fill_string}{string}")
}
} else {
string
}
}
fn fill_string_with_precision(&self, string: String, fill_char: char) -> String {
let num_chars = string.chars().count();
let width = match &self.precision {
Some(CFormatPrecision::Quantity(CFormatQuantity::Amount(width))) => {
cmp::max(width, &num_chars)
}
_ => &num_chars,
};
let fill_chars_needed = width.saturating_sub(num_chars);
let fill_string = CFormatSpec::compute_fill_string(fill_char, fill_chars_needed);
if !fill_string.is_empty() {
// Don't left-adjust if precision-filling: that will always be prepending 0s to %d
// arguments, the LEFT_ADJUST flag will be used by a later call to fill_string with
// the 0-filled string as the string param.
format!("{fill_string}{string}")
} else {
string
}
}
fn format_string_with_precision(
&self,
string: String,
precision: Option<&CFormatPrecision>,
) -> String {
// truncate if needed
let string = match precision {
Some(CFormatPrecision::Quantity(CFormatQuantity::Amount(precision)))
if string.chars().count() > *precision =>
{
string.chars().take(*precision).collect::<String>()
}
Some(CFormatPrecision::Dot) => {
// truncate to 0
String::new()
}
_ => string,
};
self.fill_string(string, ' ', None)
}
#[inline]
pub fn format_string(&self, string: String) -> String {
self.format_string_with_precision(string, self.precision.as_ref())
}
#[inline]
pub fn format_char(&self, ch: char) -> String {
self.format_string_with_precision(
ch.to_string(),
Some(&(CFormatQuantity::Amount(1).into())),
)
}
pub fn format_bytes(&self, bytes: &[u8]) -> Vec<u8> {
let bytes = if let Some(CFormatPrecision::Quantity(CFormatQuantity::Amount(precision))) =
self.precision
{
&bytes[..cmp::min(bytes.len(), precision)]
} else {
bytes
};
if let Some(CFormatQuantity::Amount(width)) = self.min_field_width {
let fill = cmp::max(0, width - bytes.len());
let mut v = Vec::with_capacity(bytes.len() + fill);
if self.flags.contains(CConversionFlags::LEFT_ADJUST) {
v.extend_from_slice(bytes);
v.append(&mut vec![b' '; fill]);
} else {
v.append(&mut vec![b' '; fill]);
v.extend_from_slice(bytes);
}
v
} else {
bytes.to_vec()
}
}
pub fn format_number(&self, num: &BigInt) -> String {
use CNumberType::*;
let magnitude = num.abs();
let prefix = if self.flags.contains(CConversionFlags::ALTERNATE_FORM) {
match self.format_type {
CFormatType::Number(Octal) => "0o",
CFormatType::Number(Hex(Case::Lower)) => "0x",
CFormatType::Number(Hex(Case::Upper)) => "0X",
_ => "",
}
} else {
""
};
let magnitude_string: String = match self.format_type {
CFormatType::Number(Decimal) => magnitude.to_str_radix(10),
CFormatType::Number(Octal) => magnitude.to_str_radix(8),
CFormatType::Number(Hex(Case::Lower)) => magnitude.to_str_radix(16),
CFormatType::Number(Hex(Case::Upper)) => {
let mut result = magnitude.to_str_radix(16);
result.make_ascii_uppercase();
result
}
_ => unreachable!(), // Should not happen because caller has to make sure that this is a number
};
let sign_string = match num.sign() {
Sign::Minus => "-",
_ => self.flags.sign_string(),
};
let padded_magnitude_string = self.fill_string_with_precision(magnitude_string, '0');
if self.flags.contains(CConversionFlags::ZERO_PAD) {
let fill_char = if !self.flags.contains(CConversionFlags::LEFT_ADJUST) {
'0'
} else {
' ' // '-' overrides the '0' conversion if both are given
};
let signed_prefix = format!("{sign_string}{prefix}");
format!(
"{}{}",
signed_prefix,
self.fill_string(
padded_magnitude_string,
fill_char,
Some(signed_prefix.chars().count()),
),
)
} else {
self.fill_string(
format!("{sign_string}{prefix}{padded_magnitude_string}"),
' ',
None,
)
}
}
pub fn format_float(&self, num: f64) -> String {
let sign_string = if num.is_sign_negative() && !num.is_nan() {
"-"
} else {
self.flags.sign_string()
};
let precision = match &self.precision {
Some(CFormatPrecision::Quantity(quantity)) => match quantity {
CFormatQuantity::Amount(amount) => *amount,
CFormatQuantity::FromValuesTuple => 6,
},
Some(CFormatPrecision::Dot) => 0,
None => 6,
};
let magnitude_string = match &self.format_type {
CFormatType::Float(CFloatType::PointDecimal(case)) => {
let magnitude = num.abs();
float::format_fixed(
precision,
magnitude,
*case,
self.flags.contains(CConversionFlags::ALTERNATE_FORM),
)
}
CFormatType::Float(CFloatType::Exponent(case)) => {
let magnitude = num.abs();
float::format_exponent(
precision,
magnitude,
*case,
self.flags.contains(CConversionFlags::ALTERNATE_FORM),
)
}
CFormatType::Float(CFloatType::General(case)) => {
let precision = if precision == 0 { 1 } else { precision };
let magnitude = num.abs();
float::format_general(
precision,
magnitude,
*case,
self.flags.contains(CConversionFlags::ALTERNATE_FORM),
false,
)
}
_ => unreachable!(),
};
if self.flags.contains(CConversionFlags::ZERO_PAD) {
let fill_char = if !self.flags.contains(CConversionFlags::LEFT_ADJUST) {
'0'
} else {
' '
};
format!(
"{}{}",
sign_string,
self.fill_string(
magnitude_string,
fill_char,
Some(sign_string.chars().count()),
)
)
} else {
self.fill_string(format!("{sign_string}{magnitude_string}"), ' ', None)
}
}
}
fn parse_spec_mapping_key<T, I>(iter: &mut ParseIter<I>) -> Result<Option<String>, ParsingError>
where
T: Into<char> + Copy,
I: Iterator<Item = T>,
{
if let Some(&(index, c)) = iter.peek() {
if c.into() == '(' {
iter.next().unwrap();
return match parse_text_inside_parentheses(iter) {
Some(key) => Ok(Some(key)),
None => Err((CFormatErrorType::UnmatchedKeyParentheses, index)),
};
}
}
Ok(None)
}
fn parse_flags<T, I>(iter: &mut ParseIter<I>) -> CConversionFlags
where
T: Into<char> + Copy,
I: Iterator<Item = T>,
{
let mut flags = CConversionFlags::empty();
while let Some(&(_, c)) = iter.peek() {
let flag = match c.into() {
'#' => CConversionFlags::ALTERNATE_FORM,
'0' => CConversionFlags::ZERO_PAD,
'-' => CConversionFlags::LEFT_ADJUST,
' ' => CConversionFlags::BLANK_SIGN,
'+' => CConversionFlags::SIGN_CHAR,
_ => break,
};
iter.next().unwrap();
flags |= flag;
}
flags
}
fn consume_length<T, I>(iter: &mut ParseIter<I>)
where
T: Into<char> + Copy,
I: Iterator<Item = T>,
{
if let Some(&(_, c)) = iter.peek() {
let c = c.into();
if c == 'h' || c == 'l' || c == 'L' {
iter.next().unwrap();
}
}
}
fn parse_format_type<T, I>(iter: &mut ParseIter<I>) -> Result<(CFormatType, char), ParsingError>
where
T: Into<char>,
I: Iterator<Item = T>,
{
use CFloatType::*;
use CNumberType::*;
let (index, c) = match iter.next() {
Some((index, c)) => (index, c.into()),
None => {
return Err((
CFormatErrorType::IncompleteFormat,
iter.peek().map(|x| x.0).unwrap_or(0),
));
}
};
let format_type = match c {
'd' | 'i' | 'u' => CFormatType::Number(Decimal),
'o' => CFormatType::Number(Octal),
'x' => CFormatType::Number(Hex(Case::Lower)),
'X' => CFormatType::Number(Hex(Case::Upper)),
'e' => CFormatType::Float(Exponent(Case::Lower)),
'E' => CFormatType::Float(Exponent(Case::Upper)),
'f' => CFormatType::Float(PointDecimal(Case::Lower)),
'F' => CFormatType::Float(PointDecimal(Case::Upper)),
'g' => CFormatType::Float(General(Case::Lower)),
'G' => CFormatType::Float(General(Case::Upper)),
'c' => CFormatType::Character,
'r' => CFormatType::String(CFormatConversion::Repr),
's' => CFormatType::String(CFormatConversion::Str),
'b' => CFormatType::String(CFormatConversion::Bytes),
'a' => CFormatType::String(CFormatConversion::Ascii),
_ => return Err((CFormatErrorType::UnsupportedFormatChar(c), index)),
};
Ok((format_type, c))
}
fn parse_quantity<T, I>(iter: &mut ParseIter<I>) -> Result<Option<CFormatQuantity>, ParsingError>
where
T: Into<char> + Copy,
I: Iterator<Item = T>,
{
if let Some(&(_, c)) = iter.peek() {
let c: char = c.into();
if c == '*' {
iter.next().unwrap();
return Ok(Some(CFormatQuantity::FromValuesTuple));
}
if let Some(i) = c.to_digit(10) {
let mut num = i as i32;
iter.next().unwrap();
while let Some(&(index, c)) = iter.peek() {
if let Some(i) = c.into().to_digit(10) {
num = num
.checked_mul(10)
.and_then(|num| num.checked_add(i as i32))
.ok_or((CFormatErrorType::IntTooBig, index))?;
iter.next().unwrap();
} else {
break;
}
}
return Ok(Some(CFormatQuantity::Amount(num.unsigned_abs() as usize)));
}
}
Ok(None)
}
fn parse_precision<T, I>(iter: &mut ParseIter<I>) -> Result<Option<CFormatPrecision>, ParsingError>
where
T: Into<char> + Copy,
I: Iterator<Item = T>,
{
if let Some(&(_, c)) = iter.peek() {
if c.into() == '.' {
iter.next().unwrap();
let quantity = parse_quantity(iter)?;
let precision = quantity.map_or(CFormatPrecision::Dot, CFormatPrecision::Quantity);
return Ok(Some(precision));
}
}
Ok(None)
}
fn parse_text_inside_parentheses<T, I>(iter: &mut ParseIter<I>) -> Option<String>
where
T: Into<char>,
I: Iterator<Item = T>,
{
let mut counter: i32 = 1;
let mut contained_text = String::new();
loop {
let (_, c) = iter.next()?;
let c = c.into();
match c {
_ if c == '(' => {
counter += 1;
}
_ if c == ')' => {
counter -= 1;
}
_ => (),
}
if counter > 0 {
contained_text.push(c);
} else {
break;
}
}
Some(contained_text)
}
#[derive(Debug, PartialEq)]
pub enum CFormatPart<T> {
Literal(T),
Spec(CFormatSpec),
}
impl<T> CFormatPart<T> {
#[inline]
pub fn is_specifier(&self) -> bool {
matches!(self, CFormatPart::Spec(_))
}
#[inline]
pub fn has_key(&self) -> bool {
match self {
CFormatPart::Spec(s) => s.mapping_key.is_some(),
_ => false,
}
}
}
#[derive(Debug, PartialEq)]
pub struct CFormatStrOrBytes<S> {
parts: Vec<(usize, CFormatPart<S>)>,
}
impl<S> CFormatStrOrBytes<S> {
pub fn check_specifiers(&self) -> Option<(usize, bool)> {
let mut count = 0;
let mut mapping_required = false;
for (_, part) in &self.parts {
if part.is_specifier() {
let has_key = part.has_key();
if count == 0 {
mapping_required = has_key;
} else if mapping_required != has_key {
return None;
}
count += 1;
}
}
Some((count, mapping_required))
}
#[inline]
pub fn iter(&self) -> impl Iterator<Item = &(usize, CFormatPart<S>)> {
self.parts.iter()
}
#[inline]
pub fn iter_mut(&mut self) -> impl Iterator<Item = &mut (usize, CFormatPart<S>)> {
self.parts.iter_mut()
}
}
pub type CFormatBytes = CFormatStrOrBytes<Vec<u8>>;
impl CFormatBytes {
pub fn parse<I: Iterator<Item = u8>>(iter: &mut ParseIter<I>) -> Result<Self, CFormatError> {
let mut parts = vec![];
let mut literal = vec![];
let mut part_index = 0;
while let Some((index, c)) = iter.next() {
if c == b'%' {
if let Some(&(_, second)) = iter.peek() {
if second == b'%' {
iter.next().unwrap();
literal.push(b'%');
continue;
} else {
if !literal.is_empty() {
parts.push((
part_index,
CFormatPart::Literal(std::mem::take(&mut literal)),
));
}
let spec = CFormatSpec::parse(iter).map_err(|err| CFormatError {
typ: err.0,
index: err.1,
})?;
parts.push((index, CFormatPart::Spec(spec)));
if let Some(&(index, _)) = iter.peek() {
part_index = index;
}
}
} else {
return Err(CFormatError {
typ: CFormatErrorType::IncompleteFormat,
index: index + 1,
});
}
} else {
literal.push(c);
}
}
if !literal.is_empty() {
parts.push((part_index, CFormatPart::Literal(literal)));
}
Ok(Self { parts })
}
pub fn parse_from_bytes(bytes: &[u8]) -> Result<Self, CFormatError> {
let mut iter = bytes.iter().cloned().enumerate().peekable();
Self::parse(&mut iter)
}
}
pub type CFormatString = CFormatStrOrBytes<String>;
impl FromStr for CFormatString {
type Err = CFormatError;
fn from_str(text: &str) -> Result<Self, Self::Err> {
let mut iter = text.chars().enumerate().peekable();
Self::parse(&mut iter)
}
}
impl CFormatString {
pub(crate) fn parse<I: Iterator<Item = char>>(
iter: &mut ParseIter<I>,
) -> Result<Self, CFormatError> {
let mut parts = vec![];
let mut literal = String::new();
let mut part_index = 0;
while let Some((index, c)) = iter.next() {
if c == '%' {
if let Some(&(_, second)) = iter.peek() {
if second == '%' {
iter.next().unwrap();
literal.push('%');
continue;
} else {
if !literal.is_empty() {
parts.push((
part_index,
CFormatPart::Literal(std::mem::take(&mut literal)),
));
}
let spec = CFormatSpec::parse(iter).map_err(|err| CFormatError {
typ: err.0,
index: err.1,
})?;
parts.push((index, CFormatPart::Spec(spec)));
if let Some(&(index, _)) = iter.peek() {
part_index = index;
}
}
} else {
return Err(CFormatError {
typ: CFormatErrorType::IncompleteFormat,
index: index + 1,
});
}
} else {
literal.push(c);
}
}
if !literal.is_empty() {
parts.push((part_index, CFormatPart::Literal(literal)));
}
Ok(Self { parts })
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_fill_and_align() {
assert_eq!(
"%10s"
.parse::<CFormatSpec>()
.unwrap()
.format_string("test".to_owned()),
" test".to_owned()
);
assert_eq!(
"%-10s"
.parse::<CFormatSpec>()
.unwrap()
.format_string("test".to_owned()),
"test ".to_owned()
);
assert_eq!(
"%#10x"
.parse::<CFormatSpec>()
.unwrap()
.format_number(&BigInt::from(0x1337)),
" 0x1337".to_owned()
);
assert_eq!(
"%-#10x"
.parse::<CFormatSpec>()
.unwrap()
.format_number(&BigInt::from(0x1337)),
"0x1337 ".to_owned()
);
}
#[test]
fn test_parse_key() {
let expected = Ok(CFormatSpec {
mapping_key: Some("amount".to_owned()),
format_type: CFormatType::Number(CNumberType::Decimal),
format_char: 'd',
min_field_width: None,
precision: None,
flags: CConversionFlags::empty(),
});
assert_eq!("%(amount)d".parse::<CFormatSpec>(), expected);
let expected = Ok(CFormatSpec {
mapping_key: Some("m((u(((l((((ti))))p)))l))e".to_owned()),
format_type: CFormatType::Number(CNumberType::Decimal),
format_char: 'd',
min_field_width: None,
precision: None,
flags: CConversionFlags::empty(),
});
assert_eq!(
"%(m((u(((l((((ti))))p)))l))e)d".parse::<CFormatSpec>(),
expected
);
}
#[test]
fn test_format_parse_key_fail() {
assert_eq!(
"%(aged".parse::<CFormatString>(),
Err(CFormatError {
typ: CFormatErrorType::UnmatchedKeyParentheses,
index: 1
})
);
}
#[test]
fn test_format_parse_type_fail() {
assert_eq!(
"Hello %n".parse::<CFormatString>(),
Err(CFormatError {
typ: CFormatErrorType::UnsupportedFormatChar('n'),
index: 7
})
);
}
#[test]
fn test_incomplete_format_fail() {
assert_eq!(
"Hello %".parse::<CFormatString>(),
Err(CFormatError {
typ: CFormatErrorType::IncompleteFormat,
index: 7
})
);
}
#[test]
fn test_parse_flags() {
let expected = Ok(CFormatSpec {
format_type: CFormatType::Number(CNumberType::Decimal),
format_char: 'd',
min_field_width: Some(CFormatQuantity::Amount(10)),
precision: None,
mapping_key: None,
flags: CConversionFlags::all(),
});
let parsed = "% 0 -+++###10d".parse::<CFormatSpec>();
assert_eq!(parsed, expected);
assert_eq!(
parsed.unwrap().format_number(&BigInt::from(12)),
"+12 ".to_owned()
);
}
#[test]
fn test_parse_and_format_string() {
assert_eq!(
"%5.4s"
.parse::<CFormatSpec>()
.unwrap()
.format_string("Hello, World!".to_owned()),
" Hell".to_owned()
);
assert_eq!(
"%-5.4s"
.parse::<CFormatSpec>()
.unwrap()
.format_string("Hello, World!".to_owned()),
"Hell ".to_owned()
);
assert_eq!(
"%.s"
.parse::<CFormatSpec>()
.unwrap()
.format_string("Hello, World!".to_owned()),
"".to_owned()
);
assert_eq!(
"%5.s"
.parse::<CFormatSpec>()
.unwrap()
.format_string("Hello, World!".to_owned()),
" ".to_owned()
);
}
#[test]
fn test_parse_and_format_unicode_string() {
assert_eq!(
"%.2s"
.parse::<CFormatSpec>()
.unwrap()
.format_string("❤❤❤❤❤❤❤❤".to_owned()),
"❤❤".to_owned()
);
}
#[test]
fn test_parse_and_format_number() {
assert_eq!(
"%5d"
.parse::<CFormatSpec>()
.unwrap()
.format_number(&BigInt::from(27)),
" 27".to_owned()
);
assert_eq!(
"%05d"
.parse::<CFormatSpec>()
.unwrap()
.format_number(&BigInt::from(27)),
"00027".to_owned()
);
assert_eq!(
"%.5d"
.parse::<CFormatSpec>()
.unwrap()
.format_number(&BigInt::from(27)),
"00027".to_owned()
);
assert_eq!(
"%+05d"
.parse::<CFormatSpec>()
.unwrap()
.format_number(&BigInt::from(27)),
"+0027".to_owned()
);
assert_eq!(
"%-d"
.parse::<CFormatSpec>()
.unwrap()
.format_number(&BigInt::from(-27)),
"-27".to_owned()
);
assert_eq!(
"% d"
.parse::<CFormatSpec>()
.unwrap()
.format_number(&BigInt::from(27)),
" 27".to_owned()
);
assert_eq!(
"% d"
.parse::<CFormatSpec>()
.unwrap()
.format_number(&BigInt::from(-27)),
"-27".to_owned()
);
assert_eq!(
"%08x"
.parse::<CFormatSpec>()
.unwrap()
.format_number(&BigInt::from(0x1337)),
"00001337".to_owned()
);
assert_eq!(
"%#010x"
.parse::<CFormatSpec>()
.unwrap()
.format_number(&BigInt::from(0x1337)),
"0x00001337".to_owned()
);
assert_eq!(
"%-#010x"
.parse::<CFormatSpec>()
.unwrap()
.format_number(&BigInt::from(0x1337)),
"0x1337 ".to_owned()
);
}
#[test]
fn test_parse_and_format_float() {
assert_eq!(
"%f".parse::<CFormatSpec>().unwrap().format_float(1.2345),
"1.234500"
);
assert_eq!(
"%.2f".parse::<CFormatSpec>().unwrap().format_float(1.2345),
"1.23"
);
assert_eq!(
"%.f".parse::<CFormatSpec>().unwrap().format_float(1.2345),
"1"
);
assert_eq!(
"%+.f".parse::<CFormatSpec>().unwrap().format_float(1.2345),
"+1"
);
assert_eq!(
"%+f".parse::<CFormatSpec>().unwrap().format_float(1.2345),
"+1.234500"
);
assert_eq!(
"% f".parse::<CFormatSpec>().unwrap().format_float(1.2345),
" 1.234500"
);
assert_eq!(
"%f".parse::<CFormatSpec>().unwrap().format_float(-1.2345),
"-1.234500"
);
assert_eq!(
"%f".parse::<CFormatSpec>()
.unwrap()