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use crate::ast::{Decl, Expr, Program, Reg, Span, Stmt, Symbol};
use pretty::{DocAllocator, DocBuilder, Pretty};
impl<'a, D: DocAllocator<'a>, T: Pretty<'a, D>> Pretty<'a, D> for Span<T> {
fn pretty(self, alloc: &'a D) -> DocBuilder<'a, D> {
self.inner.pretty(alloc)
}
}
impl<'a, D: DocAllocator<'a>> Pretty<'a, D> for Symbol {
fn pretty(self, alloc: &'a D) -> DocBuilder<'a, D> {
alloc.text(self.to_string())
}
}
impl<'a, D: DocAllocator<'a>> Pretty<'a, D> for Reg {
fn pretty(self, alloc: &'a D) -> DocBuilder<'a, D> {
let doc = self.name.pretty(alloc);
if let Some(index) = self.index {
doc.append(alloc.text(index.to_string()).brackets())
} else {
doc
}
}
}
impl<'a, D: DocAllocator<'a>> Pretty<'a, D> for Expr {
fn pretty(self, alloc: &'a D) -> DocBuilder<'a, D> {
fn to_pretty<'a, D: DocAllocator<'a>>(
expr: Expr,
prec: usize,
left: bool,
top: bool,
alloc: &'a D,
) -> DocBuilder<'a, D> {
match expr {
Expr::Pi => alloc.text("pi"),
Expr::Real(f) => alloc.text(f.to_string()),
Expr::Int(i) => alloc.text(i.to_string()),
Expr::Var(s) => s.pretty(alloc),
Expr::Add(_, _)
| Expr::Sub(_, _)
| Expr::Mul(_, _)
| Expr::Div(_, _)
| Expr::Pow(_, _) => {
let (a, b, nprec, opname, assoc, comm) = match expr {
Expr::Add(a, b) => (a, b, 0, "+", true, true),
Expr::Sub(a, b) => (a, b, 0, "-", true, false),
Expr::Mul(a, b) => (a, b, 1, "*", true, true),
Expr::Div(a, b) => (a, b, 1, "/", true, false),
Expr::Pow(a, b) => (a, b, 3, "^", false, false),
_ => unreachable!(),
};
let a = to_pretty(*a.inner, nprec, true, false, alloc);
let b = to_pretty(*b.inner, nprec, false, false, alloc);
let out = a
.append(alloc.line())
.append(alloc.text(opname))
.append(alloc.space())
.append(b);
if nprec < prec || (nprec == prec && left != assoc && !comm && !top) {
out.parens().group()
} else {
out.group()
}
}
Expr::Neg(a) => {
let a = to_pretty(*a.inner, 2, false, false, alloc);
alloc.text("-").append(a)
}
Expr::Sin(_)
| Expr::Cos(_)
| Expr::Tan(_)
| Expr::Ln(_)
| Expr::Exp(_)
| Expr::Sqrt(_) => {
let (a, opname) = match expr {
Expr::Sin(a) => (a, "sin"),
Expr::Cos(a) => (a, "cos"),
Expr::Tan(a) => (a, "tan"),
Expr::Ln(a) => (a, "ln"),
Expr::Exp(a) => (a, "exp"),
Expr::Sqrt(a) => (a, "sqrt"),
_ => unreachable!(),
};
let a = to_pretty(*a.inner, 0, true, true, alloc);
alloc.text(opname).append(a.parens())
}
}
}
to_pretty(self, 0, true, true, alloc)
}
}
#[derive(Clone)]
struct Marker(&'static str, bool);
impl<'a, D: DocAllocator<'a>> Pretty<'a, D> for Marker {
fn pretty(self, alloc: &'a D) -> DocBuilder<'a, D> {
alloc.text(self.0).append(if self.1 {
alloc.hardline()
} else {
alloc.line()
})
}
}
impl<'a, D: DocAllocator<'a>> Pretty<'a, D> for Stmt {
fn pretty(self, alloc: &'a D) -> DocBuilder<'a, D> {
match self {
Stmt::U {
theta,
phi,
lambda,
reg,
} => alloc
.text("U")
.append(
alloc
.line_()
.append(alloc.intersperse(
[theta.pretty(alloc), phi.pretty(alloc), lambda.pretty(alloc)],
Marker(",", false),
))
.nest(2)
.append(alloc.line_())
.parens()
.group(),
)
.append(alloc.space())
.append(reg.pretty(alloc))
.append(alloc.text(";")),
Stmt::CX { copy, xor } => alloc
.text("CX")
.append(alloc.space())
.append(copy.pretty(alloc))
.append(alloc.text(", "))
.append(xor.pretty(alloc))
.append(alloc.text(";")),
Stmt::Reset { reg } => alloc
.text("reset")
.append(alloc.space())
.append(reg.pretty(alloc))
.append(alloc.text(";")),
Stmt::Measure { from, to } => alloc
.text("measure")
.append(alloc.space())
.append(from.pretty(alloc))
.append(alloc.text(" -> "))
.append(to.pretty(alloc))
.append(alloc.text(";")),
Stmt::Conditional { reg, val, then } => alloc
.text("if")
.append(
alloc
.line_()
.append(
reg.pretty(alloc)
.append(alloc.text(" == "))
.append(alloc.text(val.inner.to_string())),
)
.nest(2)
.append(alloc.line_())
.parens()
.group(),
)
.append(then.pretty(alloc)),
Stmt::Barrier { regs } => alloc
.text("barrier")
.append(if regs.len() > 3 {
alloc.hardline()
} else {
alloc.space()
})
.append(
alloc
.intersperse(
regs.chunks(3).map(|regs| {
alloc
.intersperse(regs.iter().cloned(), Marker(",", false))
.group()
}),
Marker(",", true),
)
.nest(2),
)
.append(alloc.text(";")),
Stmt::Gate { name, params, args } => {
let mut out = name.pretty(alloc);
if !params.is_empty() {
let start = || {
if params.len() > 3 {
alloc.hardline()
} else {
alloc.line_()
}
};
out = out.append(
start()
.append(alloc.intersperse(
params.chunks(3).map(|regs| {
alloc
.intersperse(regs.iter().cloned(), Marker(",", false))
.group()
}),
Marker(",", true),
))
.nest(2)
.append(start())
.parens()
.group(),
);
}
if !args.is_empty() {
let start = if args.len() > 3 {
alloc.hardline()
} else {
alloc.line_()
};
out = out.append(alloc.space()).append(
start
.append(alloc.intersperse(
args.chunks(3).map(|regs| {
alloc
.intersperse(regs.iter().cloned(), Marker(",", false))
.group()
}),
Marker(",", true),
))
.nest(2)
.group(),
);
}
out.append(alloc.text(";"))
}
}
}
}
impl<'a, D: DocAllocator<'a>> Pretty<'a, D> for Decl {
fn pretty(self, alloc: &'a D) -> DocBuilder<'a, D> {
match self {
Decl::CReg { reg } => reg.pretty(alloc).enclose("creg ", ";"),
Decl::QReg { reg } => reg.pretty(alloc).enclose("qreg ", ";"),
Decl::Include { file } => file.pretty(alloc).enclose("include \"", "\";"),
Decl::Stmt(stmt) => stmt.pretty(alloc),
Decl::Def {
name,
params,
args,
body,
} => {
let mut out = alloc
.text(if body.is_some() { "gate " } else { "opaque " })
.append(name);
if !params.is_empty() {
out = out.append(
alloc
.line_()
.append(alloc.intersperse(params.into_iter(), Marker(",", false)))
.append(alloc.line_())
.parens()
.group(),
);
}
if !args.is_empty() {
out = out.append(alloc.space()).append(
alloc
.intersperse(args.into_iter(), Marker(",", false))
.group(),
);
}
if let Some(body) = body {
out.append(alloc.space()).append(
alloc
.hardline()
.append(alloc.intersperse(body, Marker("", true)))
.nest(2)
.append(alloc.hardline())
.braces(),
)
} else {
out.append(";")
}
}
}
}
}
impl<'a, D: DocAllocator<'a>> Pretty<'a, D> for Program {
fn pretty(self, alloc: &'a D) -> DocBuilder<'a, D> {
let mut prev = true;
let mut out = alloc
.text("OPENQASM 2.0;")
.append(alloc.hardline())
.append(alloc.hardline());
for decl in self.decls {
let multi = matches!(&*decl.inner, Decl::Def { .. });
if !prev && multi {
out = out.append(alloc.hardline());
}
out = out.append(decl).append(alloc.hardline());
if multi {
out = out.append(alloc.hardline());
}
prev = multi;
}
out
}
}
impl Reg {
/// Pretty-print this object to a string.
/// For more fine-grained control, use the `pretty::Pretty` trait from
/// the `pretty` crate directly.
pub fn to_pretty(&self, width: usize) -> String {
let mut arena = pretty::Arena::new();
let doc = self.clone().pretty(&mut arena).into_doc();
let mut out = String::new();
doc.render_fmt(width, &mut out).unwrap();
out
}
}
impl Expr {
/// Pretty-print this object to a string.
/// For more fine-grained control, use the `pretty::Pretty` trait from
/// the `pretty` crate directly.
pub fn to_pretty(&self, width: usize) -> String {
let mut arena = pretty::Arena::new();
let doc = self.clone().pretty(&mut arena).into_doc();
let mut out = String::new();
doc.render_fmt(width, &mut out).unwrap();
out
}
}
impl Stmt {
/// Pretty-print this object to a string.
/// For more fine-grained control, use the `pretty::Pretty` trait from
/// the `pretty` crate directly.
pub fn to_pretty(&self, width: usize) -> String {
let mut arena = pretty::Arena::new();
let doc = self.clone().pretty(&mut arena).into_doc();
let mut out = String::new();
doc.render_fmt(width, &mut out).unwrap();
out
}
}
impl Decl {
/// Pretty-print this object to a string.
/// For more fine-grained control, use the `pretty::Pretty` trait from
/// the `pretty` crate directly.
pub fn to_pretty(&self, width: usize) -> String {
let mut arena = pretty::Arena::new();
let doc = self.clone().pretty(&mut arena).into_doc();
let mut out = String::new();
doc.render_fmt(width, &mut out).unwrap();
out
}
}
impl Program {
/// Pretty-print this object to a string.
/// For more fine-grained control, use the `pretty::Pretty` trait from
/// the `pretty` crate directly.
pub fn to_pretty(&self, width: usize) -> String {
let mut arena = pretty::Arena::new();
let doc = self.clone().pretty(&mut arena).into_doc();
let mut out = String::new();
doc.render_fmt(width, &mut out).unwrap();
out
}
}