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//! Configuration options related to rewriting a list.
use rustfmt_config_proc_macro::config_type;
use crate::config::IndentStyle;
/// The definitive formatting tactic for lists.
#[derive(Eq, PartialEq, Debug, Copy, Clone)]
pub enum DefinitiveListTactic {
Vertical,
Horizontal,
Mixed,
/// Special case tactic for `format!()`, `write!()` style macros.
SpecialMacro(usize),
}
impl DefinitiveListTactic {
pub fn ends_with_newline(&self, indent_style: IndentStyle) -> bool {
match indent_style {
IndentStyle::Block => *self != DefinitiveListTactic::Horizontal,
IndentStyle::Visual => false,
}
}
}
/// Formatting tactic for lists. This will be cast down to a
/// `DefinitiveListTactic` depending on the number and length of the items and
/// their comments.
#[config_type]
pub enum ListTactic {
/// One item per row.
Vertical,
/// All items on one row.
Horizontal,
/// Try Horizontal layout, if that fails then vertical.
HorizontalVertical,
/// HorizontalVertical with a soft limit of n characters.
LimitedHorizontalVertical(usize),
/// Pack as many items as possible per row over (possibly) many rows.
Mixed,
}
#[config_type]
pub enum SeparatorTactic {
Always,
Never,
Vertical,
}
impl SeparatorTactic {
pub fn from_bool(b: bool) -> SeparatorTactic {
if b {
SeparatorTactic::Always
} else {
SeparatorTactic::Never
}
}
}
/// Where to put separator.
#[config_type]
pub enum SeparatorPlace {
Front,
Back,
}
impl SeparatorPlace {
pub fn is_front(self) -> bool {
self == SeparatorPlace::Front
}
pub fn is_back(self) -> bool {
self == SeparatorPlace::Back
}
pub fn from_tactic(
default: SeparatorPlace,
tactic: DefinitiveListTactic,
sep: &str,
) -> SeparatorPlace {
match tactic {
DefinitiveListTactic::Vertical => default,
_ => {
if sep == "," {
SeparatorPlace::Back
} else {
default
}
}
}
}
}