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use std::fmt::Display;
#[derive(Debug, Clone, PartialEq)]
pub enum Composite {
SelectionFunction {
func: BuiltinSelectionFn,
search_mod: Option<SearchModifier>,
result_transform: Option<ResultTransform>,
},
TextFunction {
func: BuiltinTextFn,
swapped: bool,
},
Hook {
kind: HookKind,
f: Box<Composite>,
g: Box<Composite>,
},
Train2 {
f: Box<Composite>,
g: Box<Composite>,
},
Train3 {
f: Box<Composite>,
g: Box<Composite>,
h: Box<Composite>,
},
Group {
operations: Vec<Composite>,
},
}
impl Display for Composite {
fn fmt(&self, fmtr: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
use crate::expression::Composite::*;
fn s<T: Display>(x: &Option<T>) -> String {
if let Some(x) = x {
x.to_string()
} else {
String::new()
}
}
match self {
SelectionFunction {
func,
search_mod,
result_transform,
} => write!(fmtr, "{}{}{func}", s(result_transform), s(search_mod)),
TextFunction { func, swapped } => {
write!(fmtr, "{}{func}", if *swapped { "@" } else { "" })
}
Hook { kind, f, g } => write!(fmtr, "({f}{kind}{g})"),
Train2 { f, g } => write!(fmtr, "({f} {g})"),
Train3 { f, g, h } => write!(fmtr, "({f} {g} {h})"),
Group { operations } => {
write!(fmtr, "{{ ")?;
for (i, op) in operations.iter().enumerate() {
if i > 0 {
write!(fmtr, " , ")?;
}
write!(fmtr, "{}", op)?;
}
write!(fmtr, " }}")
}
}
}
}
#[derive(Debug, Clone, PartialEq)]
pub enum BuiltinSelectionFn {
Empty,
EndOfBuffer,
Span,
CharOffset(usize),
Line(usize),
Regex(String),
AllMatches(String),
RelativeLine(usize),
BufferMatch(String),
}
impl Display for BuiltinSelectionFn {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
use crate::expression::BuiltinSelectionFn::*;
match self {
Empty => write!(f, "e"),
EndOfBuffer => write!(f, "$"),
Span => write!(f, "-"),
CharOffset(pos) => write!(f, "#{}", pos),
Line(pos) => write!(f, "{}", pos),
Regex(pat) => write!(f, "/{}/", pat),
AllMatches(pat) => write!(f, "x/{}/", pat),
RelativeLine(pos) => write!(f, "+{}", pos),
BufferMatch(pat) => write!(f, "B/{}/", pat),
}
}
}
#[derive(Debug, Clone, PartialEq)]
pub enum BuiltinTextFn {
Dot,
Change,
Insert,
Append,
Delete,
Write,
Pipe,
Literal(String),
}
impl Display for BuiltinTextFn {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
use crate::expression::BuiltinTextFn::*;
match self {
Dot => write!(f, "."),
Change => write!(f, "c"),
Insert => write!(f, "i"),
Append => write!(f, "a"),
Delete => write!(f, "d"),
Write => write!(f, "w"),
Pipe => write!(f, "|"),
Literal(s) => write!(f, "\"{}\"", s),
}
}
}
#[derive(Debug, Clone, Copy, PartialEq)]
pub enum SearchModifier {
Reverse,
Sequential,
ReverseSequential,
SequentialReverse,
}
impl Display for SearchModifier {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
use crate::expression::SearchModifier::*;
match self {
Reverse => write!(f, "'"),
Sequential => write!(f, ";"),
ReverseSequential => write!(f, "';"),
SequentialReverse => write!(f, ";'"),
}
}
}
#[derive(Debug, Clone, Copy, PartialEq)]
pub enum ResultTransform {
Complement,
Conditional,
ComplementConditional,
ConditionalComplement,
}
impl Display for ResultTransform {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
use crate::expression::ResultTransform::*;
match self {
Complement => write!(f, "~"),
Conditional => write!(f, "?"),
ComplementConditional => write!(f, "~?"),
ConditionalComplement => write!(f, "?~"),
}
}
}
#[derive(Debug, Clone, Copy, PartialEq)]
pub enum HookKind {
Before,
After,
}
impl Display for HookKind {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
HookKind::Before => write!(f, ">"),
HookKind::After => write!(f, "<"),
}
}
}
#[cfg(test)]
mod tests {
use crate::expression::*;
#[test]
fn format_3train() {
// nonsense, but it exercises the code
let comp = Composite::Train3 {
f: Box::new(Composite::SelectionFunction {
func: BuiltinSelectionFn::AllMatches(String::from("re")),
result_transform: Some(ResultTransform::Complement),
search_mod: Some(SearchModifier::Reverse),
}),
g: Box::new(Composite::Train2 {
f: Box::new(Composite::TextFunction {
func: BuiltinTextFn::Change,
swapped: false,
}),
g: Box::new(Composite::SelectionFunction {
func: BuiltinSelectionFn::Line(5),
result_transform: None,
search_mod: None,
}),
}),
h: Box::new(Composite::Hook {
kind: HookKind::Before,
f: Box::new(Composite::SelectionFunction {
func: BuiltinSelectionFn::Empty,
result_transform: None,
search_mod: None,
}),
g: Box::new(Composite::TextFunction {
func: BuiltinTextFn::Delete,
swapped: false,
}),
}),
};
let formatted = format!("{}", comp);
println!("Formatted: {}", formatted);
assert_eq!(formatted, "(~'x/re/ (c 5) (e>d))");
}
}
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