/
parse.rs
985 lines (935 loc) · 32.1 KB
/
parse.rs
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// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
//! Parsing of format strings
//!
//! These structures are used when parsing format strings for the compiler.
//! Parsing does not happen at runtime: structures of `std::fmt::rt` are
//! generated instead.
use prelude::*;
use char;
use str;
/// A piece is a portion of the format string which represents the next part
/// to emit. These are emitted as a stream by the `Parser` class.
#[deriving(Eq)]
pub enum Piece<'a> {
/// A literal string which should directly be emitted
String(&'a str),
/// A back-reference to whatever the current argument is. This is used
/// inside of a method call to refer back to the original argument.
CurrentArgument,
/// This describes that formatting should process the next argument (as
/// specified inside) for emission.
Argument(Argument<'a>),
}
/// Representation of an argument specification.
#[deriving(Eq)]
pub struct Argument<'a> {
/// Where to find this argument
pub position: Position<'a>,
/// How to format the argument
pub format: FormatSpec<'a>,
/// If not `None`, what method to invoke on the argument
pub method: Option<~Method<'a>>
}
/// Specification for the formatting of an argument in the format string.
#[deriving(Eq)]
pub struct FormatSpec<'a> {
/// Optionally specified character to fill alignment with
pub fill: Option<char>,
/// Optionally specified alignment
pub align: Alignment,
/// Packed version of various flags provided
pub flags: uint,
/// The integer precision to use
pub precision: Count<'a>,
/// The string width requested for the resulting format
pub width: Count<'a>,
/// The descriptor string representing the name of the format desired for
/// this argument, this can be empty or any number of characters, although
/// it is required to be one word.
pub ty: &'a str
}
/// Enum describing where an argument for a format can be located.
#[deriving(Eq)]
pub enum Position<'a> {
/// The argument will be in the next position. This is the default.
ArgumentNext,
/// The argument is located at a specific index.
ArgumentIs(uint),
/// The argument has a name.
ArgumentNamed(&'a str),
}
/// Enum of alignments which are supported.
#[deriving(Eq)]
pub enum Alignment {
/// The value will be aligned to the left.
AlignLeft,
/// The value will be aligned to the right.
AlignRight,
/// The value will take on a default alignment.
AlignUnknown,
}
/// Various flags which can be applied to format strings. The meaning of these
/// flags is defined by the formatters themselves.
#[deriving(Eq)]
pub enum Flag {
/// A `+` will be used to denote positive numbers.
FlagSignPlus,
/// A `-` will be used to denote negative numbers. This is the default.
FlagSignMinus,
/// An alternate form will be used for the value. In the case of numbers,
/// this means that the number will be prefixed with the supplied string.
FlagAlternate,
/// For numbers, this means that the number will be padded with zeroes,
/// and the sign (`+` or `-`) will precede them.
FlagSignAwareZeroPad,
}
/// A count is used for the precision and width parameters of an integer, and
/// can reference either an argument or a literal integer.
#[deriving(Eq)]
pub enum Count<'a> {
/// The count is specified explicitly.
CountIs(uint),
/// The count is specified by the argument with the given name.
CountIsName(&'a str),
/// The count is specified by the argument at the given index.
CountIsParam(uint),
/// The count is specified by the next parameter.
CountIsNextParam,
/// The count is implied and cannot be explicitly specified.
CountImplied,
}
/// Enum describing all of the possible methods which the formatting language
/// currently supports.
#[deriving(Eq)]
pub enum Method<'a> {
/// A plural method selects on an integer over a list of either integer or
/// keyword-defined clauses. The meaning of the keywords is defined by the
/// current locale.
///
/// An offset is optionally present at the beginning which is used to
/// match against keywords, but it is not matched against the literal
/// integers.
///
/// The final element of this enum is the default "other" case which is
/// always required to be specified.
Plural(Option<uint>, Vec<PluralArm<'a>>, Vec<Piece<'a>>),
/// A select method selects over a string. Each arm is a different string
/// which can be selected for.
///
/// As with `Plural`, a default "other" case is required as well.
Select(Vec<SelectArm<'a>>, Vec<Piece<'a>>),
}
/// A selector for what pluralization a plural method should take
#[deriving(Eq, TotalEq, Hash)]
pub enum PluralSelector {
/// One of the plural keywords should be used
Keyword(PluralKeyword),
/// A literal pluralization should be used
Literal(uint),
}
/// Structure representing one "arm" of the `plural` function.
#[deriving(Eq)]
pub struct PluralArm<'a> {
/// A selector can either be specified by a keyword or with an integer
/// literal.
pub selector: PluralSelector,
/// Array of pieces which are the format of this arm
pub result: Vec<Piece<'a>>,
}
/// Enum of the 5 CLDR plural keywords. There is one more, "other", but that
/// is specially placed in the `Plural` variant of `Method`.
///
/// http://www.icu-project.org/apiref/icu4c/classicu_1_1PluralRules.html
#[deriving(Eq, TotalEq, Hash)]
#[allow(missing_doc)]
pub enum PluralKeyword {
/// The plural form for zero objects.
Zero,
/// The plural form for one object.
One,
/// The plural form for two objects.
Two,
/// The plural form for few objects.
Few,
/// The plural form for many objects.
Many,
}
/// Structure representing one "arm" of the `select` function.
#[deriving(Eq)]
pub struct SelectArm<'a> {
/// String selector which guards this arm
pub selector: &'a str,
/// Array of pieces which are the format of this arm
pub result: Vec<Piece<'a>>,
}
/// The parser structure for interpreting the input format string. This is
/// modelled as an iterator over `Piece` structures to form a stream of tokens
/// being output.
///
/// This is a recursive-descent parser for the sake of simplicity, and if
/// necessary there's probably lots of room for improvement performance-wise.
pub struct Parser<'a> {
input: &'a str,
cur: str::CharOffsets<'a>,
depth: uint,
/// Error messages accumulated during parsing
pub errors: Vec<~str>,
}
impl<'a> Iterator<Piece<'a>> for Parser<'a> {
fn next(&mut self) -> Option<Piece<'a>> {
match self.cur.clone().next() {
Some((_, '#')) => { self.cur.next(); Some(CurrentArgument) }
Some((_, '{')) => {
self.cur.next();
let ret = Some(Argument(self.argument()));
self.must_consume('}');
ret
}
Some((pos, '\\')) => {
self.cur.next();
self.escape(); // ensure it's a valid escape sequence
Some(String(self.string(pos + 1))) // skip the '\' character
}
Some((_, '}')) if self.depth == 0 => {
self.cur.next();
self.err("unmatched `}` found");
None
}
Some((_, '}')) | None => { None }
Some((pos, _)) => {
Some(String(self.string(pos)))
}
}
}
}
impl<'a> Parser<'a> {
/// Creates a new parser for the given format string
pub fn new<'a>(s: &'a str) -> Parser<'a> {
Parser {
input: s,
cur: s.char_indices(),
depth: 0,
errors: vec!(),
}
}
/// Notifies of an error. The message doesn't actually need to be of type
/// ~str, but I think it does when this eventually uses conditions so it
/// might as well start using it now.
fn err(&mut self, msg: &str) {
self.errors.push(msg.to_owned());
}
/// Optionally consumes the specified character. If the character is not at
/// the current position, then the current iterator isn't moved and false is
/// returned, otherwise the character is consumed and true is returned.
fn consume(&mut self, c: char) -> bool {
match self.cur.clone().next() {
Some((_, maybe)) if c == maybe => {
self.cur.next();
true
}
Some(..) | None => false,
}
}
/// Forces consumption of the specified character. If the character is not
/// found, an error is emitted.
fn must_consume(&mut self, c: char) {
self.ws();
match self.cur.clone().next() {
Some((_, maybe)) if c == maybe => {
self.cur.next();
}
Some((_, other)) => {
self.err(
format!("expected `{}` but found `{}`", c, other));
}
None => {
self.err(
format!("expected `{}` but string was terminated", c));
}
}
}
/// Attempts to consume any amount of whitespace followed by a character
fn wsconsume(&mut self, c: char) -> bool {
self.ws(); self.consume(c)
}
/// Consumes all whitespace characters until the first non-whitespace
/// character
fn ws(&mut self) {
loop {
match self.cur.clone().next() {
Some((_, c)) if char::is_whitespace(c) => { self.cur.next(); }
Some(..) | None => { return }
}
}
}
/// Consumes an escape sequence, failing if there is not a valid character
/// to be escaped.
fn escape(&mut self) -> char {
match self.cur.next() {
Some((_, c @ '#')) | Some((_, c @ '{')) |
Some((_, c @ '\\')) | Some((_, c @ '}')) => { c }
Some((_, c)) => {
self.err(format!("invalid escape character `{}`", c));
c
}
None => {
self.err("expected an escape sequence, but format string was \
terminated");
' '
}
}
}
/// Parses all of a string which is to be considered a "raw literal" in a
/// format string. This is everything outside of the braces.
fn string(&mut self, start: uint) -> &'a str {
loop {
// we may not consume the character, so clone the iterator
match self.cur.clone().next() {
Some((pos, '\\')) | Some((pos, '#')) |
Some((pos, '}')) | Some((pos, '{')) => {
return self.input.slice(start, pos);
}
Some(..) => { self.cur.next(); }
None => {
self.cur.next();
return self.input.slice(start, self.input.len());
}
}
}
}
/// Parses an Argument structure, or what's contained within braces inside
/// the format string
fn argument(&mut self) -> Argument<'a> {
Argument {
position: self.position(),
format: self.format(),
method: self.method(),
}
}
/// Parses a positional argument for a format. This could either be an
/// integer index of an argument, a named argument, or a blank string.
fn position(&mut self) -> Position<'a> {
match self.integer() {
Some(i) => { ArgumentIs(i) }
None => {
match self.cur.clone().next() {
Some((_, c)) if char::is_alphabetic(c) => {
ArgumentNamed(self.word())
}
_ => ArgumentNext
}
}
}
}
/// Parses a format specifier at the current position, returning all of the
/// relevant information in the FormatSpec struct.
fn format(&mut self) -> FormatSpec<'a> {
let mut spec = FormatSpec {
fill: None,
align: AlignUnknown,
flags: 0,
precision: CountImplied,
width: CountImplied,
ty: self.input.slice(0, 0),
};
if !self.consume(':') { return spec }
// fill character
match self.cur.clone().next() {
Some((_, c)) => {
match self.cur.clone().skip(1).next() {
Some((_, '>')) | Some((_, '<')) => {
spec.fill = Some(c);
self.cur.next();
}
Some(..) | None => {}
}
}
None => {}
}
// Alignment
if self.consume('<') {
spec.align = AlignLeft;
} else if self.consume('>') {
spec.align = AlignRight;
}
// Sign flags
if self.consume('+') {
spec.flags |= 1 << (FlagSignPlus as uint);
} else if self.consume('-') {
spec.flags |= 1 << (FlagSignMinus as uint);
}
// Alternate marker
if self.consume('#') {
spec.flags |= 1 << (FlagAlternate as uint);
}
// Width and precision
let mut havewidth = false;
if self.consume('0') {
// small ambiguity with '0$' as a format string. In theory this is a
// '0' flag and then an ill-formatted format string with just a '$'
// and no count, but this is better if we instead interpret this as
// no '0' flag and '0$' as the width instead.
if self.consume('$') {
spec.width = CountIsParam(0);
havewidth = true;
} else {
spec.flags |= 1 << (FlagSignAwareZeroPad as uint);
}
}
if !havewidth {
spec.width = self.count();
}
if self.consume('.') {
if self.consume('*') {
spec.precision = CountIsNextParam;
} else {
spec.precision = self.count();
}
}
// Finally the actual format specifier
if self.consume('?') {
spec.ty = "?";
} else {
spec.ty = self.word();
}
return spec;
}
/// Parses a method to be applied to the previously specified argument and
/// its format. The two current supported methods are 'plural' and 'select'
fn method(&mut self) -> Option<~Method<'a>> {
if !self.wsconsume(',') {
return None;
}
self.ws();
match self.word() {
"select" => {
self.must_consume(',');
Some(self.select())
}
"plural" => {
self.must_consume(',');
Some(self.plural())
}
"" => {
self.err("expected method after comma");
return None;
}
method => {
self.err(format!("unknown method: `{}`", method));
return None;
}
}
}
/// Parses a 'select' statement (after the initial 'select' word)
fn select(&mut self) -> ~Method<'a> {
let mut other = None;
let mut arms = vec!();
// Consume arms one at a time
loop {
self.ws();
let selector = self.word();
if selector == "" {
self.err("cannot have an empty selector");
break
}
self.must_consume('{');
self.depth += 1;
let pieces = self.collect();
self.depth -= 1;
self.must_consume('}');
if selector == "other" {
if !other.is_none() {
self.err("multiple `other` statements in `select");
}
other = Some(pieces);
} else {
arms.push(SelectArm { selector: selector, result: pieces });
}
self.ws();
match self.cur.clone().next() {
Some((_, '}')) => { break }
Some(..) | None => {}
}
}
// The "other" selector must be present
let other = match other {
Some(arm) => { arm }
None => {
self.err("`select` statement must provide an `other` case");
vec!()
}
};
~Select(arms, other)
}
/// Parses a 'plural' statement (after the initial 'plural' word)
fn plural(&mut self) -> ~Method<'a> {
let mut offset = None;
let mut other = None;
let mut arms = vec!();
// First, attempt to parse the 'offset:' field. We know the set of
// selector words which can appear in plural arms, and the only ones
// which start with 'o' are "other" and "offset", hence look two
// characters deep to see if we can consume the word "offset"
self.ws();
let mut it = self.cur.clone();
match it.next() {
Some((_, 'o')) => {
match it.next() {
Some((_, 'f')) => {
let word = self.word();
if word != "offset" {
self.err(format!("expected `offset`, found `{}`",
word));
} else {
self.must_consume(':');
match self.integer() {
Some(i) => { offset = Some(i); }
None => {
self.err("offset must be an integer");
}
}
}
}
Some(..) | None => {}
}
}
Some(..) | None => {}
}
// Next, generate all the arms
loop {
let mut isother = false;
let selector = if self.wsconsume('=') {
match self.integer() {
Some(i) => Literal(i),
None => {
self.err("plural `=` selectors must be followed by an \
integer");
Literal(0)
}
}
} else {
let word = self.word();
match word {
"other" => { isother = true; Keyword(Zero) }
"zero" => Keyword(Zero),
"one" => Keyword(One),
"two" => Keyword(Two),
"few" => Keyword(Few),
"many" => Keyword(Many),
word => {
self.err(format!("unexpected plural selector `{}`",
word));
if word == "" {
break
} else {
Keyword(Zero)
}
}
}
};
self.must_consume('{');
self.depth += 1;
let pieces = self.collect();
self.depth -= 1;
self.must_consume('}');
if isother {
if !other.is_none() {
self.err("multiple `other` statements in `select");
}
other = Some(pieces);
} else {
arms.push(PluralArm { selector: selector, result: pieces });
}
self.ws();
match self.cur.clone().next() {
Some((_, '}')) => { break }
Some(..) | None => {}
}
}
let other = match other {
Some(arm) => { arm }
None => {
self.err("`plural` statement must provide an `other` case");
vec!()
}
};
~Plural(offset, arms, other)
}
/// Parses a Count parameter at the current position. This does not check
/// for 'CountIsNextParam' because that is only used in precision, not
/// width.
fn count(&mut self) -> Count<'a> {
match self.integer() {
Some(i) => {
if self.consume('$') {
CountIsParam(i)
} else {
CountIs(i)
}
}
None => {
let tmp = self.cur.clone();
match self.word() {
word if word.len() > 0 && self.consume('$') => {
CountIsName(word)
}
_ => {
self.cur = tmp;
CountImplied
}
}
}
}
}
/// Parses a word starting at the current position. A word is considered to
/// be an alphabetic character followed by any number of alphanumeric
/// characters.
fn word(&mut self) -> &'a str {
let start = match self.cur.clone().next() {
Some((pos, c)) if char::is_XID_start(c) => {
self.cur.next();
pos
}
Some(..) | None => { return self.input.slice(0, 0); }
};
let mut end;
loop {
match self.cur.clone().next() {
Some((_, c)) if char::is_XID_continue(c) => {
self.cur.next();
}
Some((pos, _)) => { end = pos; break }
None => { end = self.input.len(); break }
}
}
self.input.slice(start, end)
}
/// Optionally parses an integer at the current position. This doesn't deal
/// with overflow at all, it's just accumulating digits.
fn integer(&mut self) -> Option<uint> {
let mut cur = 0;
let mut found = false;
loop {
match self.cur.clone().next() {
Some((_, c)) => {
match char::to_digit(c, 10) {
Some(i) => {
cur = cur * 10 + i;
found = true;
self.cur.next();
}
None => { break }
}
}
None => { break }
}
}
if found {
return Some(cur);
} else {
return None;
}
}
}
#[cfg(test)]
mod tests {
use super::*;
use prelude::*;
fn same(fmt: &'static str, p: &[Piece<'static>]) {
let mut parser = Parser::new(fmt);
assert!(p == parser.collect::<Vec<Piece<'static>>>().as_slice());
}
fn fmtdflt() -> FormatSpec<'static> {
return FormatSpec {
fill: None,
align: AlignUnknown,
flags: 0,
precision: CountImplied,
width: CountImplied,
ty: "",
}
}
fn musterr(s: &str) {
let mut p = Parser::new(s);
p.next();
assert!(p.errors.len() != 0);
}
#[test]
fn simple() {
same("asdf", [String("asdf")]);
same("a\\{b", [String("a"), String("{b")]);
same("a\\#b", [String("a"), String("#b")]);
same("a\\}b", [String("a"), String("}b")]);
same("a\\}", [String("a"), String("}")]);
same("\\}", [String("}")]);
}
#[test] fn invalid01() { musterr("{") }
#[test] fn invalid02() { musterr("\\") }
#[test] fn invalid03() { musterr("\\a") }
#[test] fn invalid04() { musterr("{3a}") }
#[test] fn invalid05() { musterr("{:|}") }
#[test] fn invalid06() { musterr("{:>>>}") }
#[test]
fn format_nothing() {
same("{}", [Argument(Argument {
position: ArgumentNext,
format: fmtdflt(),
method: None,
})]);
}
#[test]
fn format_position() {
same("{3}", [Argument(Argument {
position: ArgumentIs(3),
format: fmtdflt(),
method: None,
})]);
}
#[test]
fn format_position_nothing_else() {
same("{3:}", [Argument(Argument {
position: ArgumentIs(3),
format: fmtdflt(),
method: None,
})]);
}
#[test]
fn format_type() {
same("{3:a}", [Argument(Argument {
position: ArgumentIs(3),
format: FormatSpec {
fill: None,
align: AlignUnknown,
flags: 0,
precision: CountImplied,
width: CountImplied,
ty: "a",
},
method: None,
})]);
}
#[test]
fn format_align_fill() {
same("{3:>}", [Argument(Argument {
position: ArgumentIs(3),
format: FormatSpec {
fill: None,
align: AlignRight,
flags: 0,
precision: CountImplied,
width: CountImplied,
ty: "",
},
method: None,
})]);
same("{3:0<}", [Argument(Argument {
position: ArgumentIs(3),
format: FormatSpec {
fill: Some('0'),
align: AlignLeft,
flags: 0,
precision: CountImplied,
width: CountImplied,
ty: "",
},
method: None,
})]);
same("{3:*<abcd}", [Argument(Argument {
position: ArgumentIs(3),
format: FormatSpec {
fill: Some('*'),
align: AlignLeft,
flags: 0,
precision: CountImplied,
width: CountImplied,
ty: "abcd",
},
method: None,
})]);
}
#[test]
fn format_counts() {
same("{:10s}", [Argument(Argument {
position: ArgumentNext,
format: FormatSpec {
fill: None,
align: AlignUnknown,
flags: 0,
precision: CountImplied,
width: CountIs(10),
ty: "s",
},
method: None,
})]);
same("{:10$.10s}", [Argument(Argument {
position: ArgumentNext,
format: FormatSpec {
fill: None,
align: AlignUnknown,
flags: 0,
precision: CountIs(10),
width: CountIsParam(10),
ty: "s",
},
method: None,
})]);
same("{:.*s}", [Argument(Argument {
position: ArgumentNext,
format: FormatSpec {
fill: None,
align: AlignUnknown,
flags: 0,
precision: CountIsNextParam,
width: CountImplied,
ty: "s",
},
method: None,
})]);
same("{:.10$s}", [Argument(Argument {
position: ArgumentNext,
format: FormatSpec {
fill: None,
align: AlignUnknown,
flags: 0,
precision: CountIsParam(10),
width: CountImplied,
ty: "s",
},
method: None,
})]);
same("{:a$.b$s}", [Argument(Argument {
position: ArgumentNext,
format: FormatSpec {
fill: None,
align: AlignUnknown,
flags: 0,
precision: CountIsName("b"),
width: CountIsName("a"),
ty: "s",
},
method: None,
})]);
}
#[test]
fn format_flags() {
same("{:-}", [Argument(Argument {
position: ArgumentNext,
format: FormatSpec {
fill: None,
align: AlignUnknown,
flags: (1 << FlagSignMinus as uint),
precision: CountImplied,
width: CountImplied,
ty: "",
},
method: None,
})]);
same("{:+#}", [Argument(Argument {
position: ArgumentNext,
format: FormatSpec {
fill: None,
align: AlignUnknown,
flags: (1 << FlagSignPlus as uint) | (1 << FlagAlternate as uint),
precision: CountImplied,
width: CountImplied,
ty: "",
},
method: None,
})]);
}
#[test]
fn format_mixture() {
same("abcd {3:a} efg", [String("abcd "), Argument(Argument {
position: ArgumentIs(3),
format: FormatSpec {
fill: None,
align: AlignUnknown,
flags: 0,
precision: CountImplied,
width: CountImplied,
ty: "a",
},
method: None,
}), String(" efg")]);
}
#[test]
fn select_simple() {
same("{, select, other { haha } }", [Argument(Argument{
position: ArgumentNext,
format: fmtdflt(),
method: Some(~Select(vec![], vec![String(" haha ")]))
})]);
same("{1, select, other { haha } }", [Argument(Argument{
position: ArgumentIs(1),
format: fmtdflt(),
method: Some(~Select(vec![], vec![String(" haha ")]))
})]);
same("{1, select, other {#} }", [Argument(Argument{
position: ArgumentIs(1),
format: fmtdflt(),
method: Some(~Select(vec![], vec![CurrentArgument]))
})]);
same("{1, select, other {{2, select, other {lol}}} }", [Argument(Argument{
position: ArgumentIs(1),
format: fmtdflt(),
method: Some(~Select(vec![], vec![Argument(Argument{
position: ArgumentIs(2),
format: fmtdflt(),
method: Some(~Select(vec![], vec![String("lol")]))
})])) // wat
})]);
}
#[test]
fn select_cases() {
same("{1, select, a{1} b{2} c{3} other{4} }", [Argument(Argument{
position: ArgumentIs(1),
format: fmtdflt(),
method: Some(~Select(vec![
SelectArm{ selector: "a", result: vec![String("1")] },
SelectArm{ selector: "b", result: vec![String("2")] },
SelectArm{ selector: "c", result: vec![String("3")] },
], vec![String("4")]))
})]);
}
#[test] fn badselect01() { musterr("{select, }") }
#[test] fn badselect02() { musterr("{1, select}") }
#[test] fn badselect03() { musterr("{1, select, }") }
#[test] fn badselect04() { musterr("{1, select, a {}}") }
#[test] fn badselect05() { musterr("{1, select, other }}") }
#[test] fn badselect06() { musterr("{1, select, other {}") }
#[test] fn badselect07() { musterr("{select, other {}") }
#[test] fn badselect08() { musterr("{1 select, other {}") }
#[test] fn badselect09() { musterr("{:d select, other {}") }
#[test] fn badselect10() { musterr("{1:d select, other {}") }
#[test]
fn plural_simple() {
same("{, plural, other { haha } }", [Argument(Argument{
position: ArgumentNext,
format: fmtdflt(),
method: Some(~Plural(None, vec![], vec![String(" haha ")]))
})]);
same("{:, plural, other { haha } }", [Argument(Argument{
position: ArgumentNext,
format: fmtdflt(),
method: Some(~Plural(None, vec![], vec![String(" haha ")]))
})]);
same("{, plural, offset:1 =2{2} =3{3} many{yes} other{haha} }",
[Argument(Argument{
position: ArgumentNext,
format: fmtdflt(),
method: Some(~Plural(Some(1), vec![
PluralArm{ selector: Literal(2), result: vec![String("2")] },
PluralArm{ selector: Literal(3), result: vec![String("3")] },
PluralArm{ selector: Keyword(Many), result: vec![String("yes")] }
], vec![String("haha")]))
})]);
}
}