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simplify and correct prefix-bracket spacing in heap_print.rs (#1914)
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@mthom
mthom committed Jul 25, 2023
1 parent 3b67ffa commit 5bc3ca4
Showing 1 changed file with 45 additions and 37 deletions.
82 changes: 45 additions & 37 deletions src/heap_print.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -484,7 +484,6 @@ pub struct HCPrinter<'a, Outputter> {
state_stack: Vec<TokenOrRedirect>,
toplevel_spec: Option<DirectedOp>,
last_item_idx: usize,
num_ops_on_stack: usize,
parent_of_first_op: Option<(DirectedOp, usize)>,
pub var_names: IndexMap<HeapCellValue, VarPtr>,
pub numbervars_offset: Integer,
Expand Down Expand Up @@ -563,7 +562,6 @@ impl<'a, Outputter: HCValueOutputter> HCPrinter<'a, Outputter> {
state_stack: vec![],
toplevel_spec: None,
last_item_idx: 0,
num_ops_on_stack: 0,
parent_of_first_op: None,
numbervars: false,
numbervars_offset: Integer::from(0),
Expand All @@ -588,15 +586,18 @@ impl<'a, Outputter: HCValueOutputter> HCPrinter<'a, Outputter> {
}

fn set_parent_of_first_op(&mut self, parent_op: Option<DirectedOp>) {
self.parent_of_first_op = parent_op.map(|op| (op, self.last_item_idx));
if let Some(op) = parent_op {
if op.is_left() && op.is_prefix() {
self.parent_of_first_op = Some((op, self.last_item_idx));
}
}
}

fn enqueue_op(&mut self, mut max_depth: usize, name: Atom, spec: OpDesc, parent_op: Option<DirectedOp>) {
fn enqueue_op(&mut self, mut max_depth: usize, name: Atom, spec: OpDesc) {
if is_postfix!(spec.get_spec()) {
if self.max_depth_exhausted(max_depth) {
self.iter.pop_stack();
self.state_stack.push(TokenOrRedirect::Atom(atom!("...")));
return;
} else if self.check_max_depth(&mut max_depth) {
self.iter.pop_stack();

Expand Down Expand Up @@ -641,7 +642,6 @@ impl<'a, Outputter: HCValueOutputter> HCPrinter<'a, Outputter> {
self.iter.pop_stack();

self.state_stack.push(TokenOrRedirect::Atom(atom!("...")));
return;
} else if self.check_max_depth(&mut max_depth) {
self.iter.pop_stack();
self.iter.pop_stack();
Expand All @@ -658,12 +658,6 @@ impl<'a, Outputter: HCValueOutputter> HCPrinter<'a, Outputter> {
self.state_stack.push(TokenOrRedirect::CompositeRedirect(max_depth, right_directed_op));
}
}

if self.num_ops_on_stack == 0 {
self.set_parent_of_first_op(parent_op);
}

self.num_ops_on_stack += 1;
}

fn format_struct(&mut self, mut max_depth: usize, arity: usize, name: Atom) -> bool {
Expand Down Expand Up @@ -777,7 +771,6 @@ impl<'a, Outputter: HCValueOutputter> HCPrinter<'a, Outputter> {
arity: usize,
name: Atom,
op_desc: Option<OpDesc>,
parent_op: Option<DirectedOp>,
) -> bool {
if self.numbervars && is_numbered_var(name, arity) {
if self.format_numbered_vars() {
Expand All @@ -796,7 +789,7 @@ impl<'a, Outputter: HCValueOutputter> HCPrinter<'a, Outputter> {
}

if !self.ignore_ops && spec.get_prec() > 0 {
self.enqueue_op(max_depth, name, spec, parent_op);
self.enqueue_op(max_depth, name, spec);
return true;
}
}
Expand Down Expand Up @@ -1064,7 +1057,6 @@ impl<'a, Outputter: HCValueOutputter> HCPrinter<'a, Outputter> {
right_directed_op,
));

self.num_ops_on_stack += 1;
self.set_parent_of_first_op(parent_op);
} else {
self.state_stack.push(TokenOrRedirect::Close);
Expand Down Expand Up @@ -1385,33 +1377,33 @@ impl<'a, Outputter: HCValueOutputter> HCPrinter<'a, Outputter> {

if add_brackets {
self.state_stack.push(TokenOrRedirect::Close);
self.format_clause(max_depth, arity, name, Some(op_desc), op);
self.format_clause(max_depth, arity, name, Some(op_desc));
self.state_stack.push(TokenOrRedirect::Open);

let parent_op = self.parent_of_first_op
.and_then(|(parent_op, last_item_idx)| {
// if parent_op isn't printed to the output string
// already, then it doesn't border the present op
// and we should return None.
if self.last_item_idx == last_item_idx {
Some(parent_op)
} else {
None
}
});
if !self.outputter.ends_with(" ") {
let parent_op = self.parent_of_first_op
.and_then(|(parent_op, last_item_idx)| {
// if parent_op isn't printed to the output string
// already, then it doesn't border the present op
// and we should return None.
if self.last_item_idx == last_item_idx {
Some(parent_op)
} else {
None
}
});

for op in &[op, parent_op] {
if let Some(ref op) = &op {
if !self.outputter.ends_with(" ") {
for op in &[op, parent_op] {
if let Some(ref op) = &op {
if op.is_left() && (op.is_prefix() || requires_space(op.as_atom().as_str(), "(")) {
self.state_stack.push(TokenOrRedirect::Space);
break;
return;
}
}
}
}
} else {
self.format_clause(max_depth, arity, name, Some(op_desc), op);
self.format_clause(max_depth, arity, name, Some(op_desc));
}
}

Expand Down Expand Up @@ -1528,7 +1520,7 @@ impl<'a, Outputter: HCValueOutputter> HCPrinter<'a, Outputter> {
);
} else {
push_space_if_amb!(printer, name.as_str(), {
printer.format_clause(max_depth, arity, name, None, op);
printer.format_clause(max_depth, arity, name, None);
});
}
} else if fetch_op_spec(name, arity, printer.op_dir).is_some() {
Expand Down Expand Up @@ -1594,7 +1586,7 @@ impl<'a, Outputter: HCValueOutputter> HCPrinter<'a, Outputter> {
);
} else {
push_space_if_amb!(self, name.as_str(), {
self.format_clause(max_depth, arity, name, None, op);
self.format_clause(max_depth, arity, name, None);
});
}
}
Expand Down Expand Up @@ -1675,9 +1667,11 @@ impl<'a, Outputter: HCValueOutputter> HCPrinter<'a, Outputter> {
TokenOrRedirect::Atom(atom) => self.print_impromptu_atom(atom),
TokenOrRedirect::BarAsOp => append_str!(self, " | "),
TokenOrRedirect::Char(c) => print_char!(self, self.quoted, c),
TokenOrRedirect::Op(atom, ..) => {
self.num_ops_on_stack -= 1;
self.parent_of_first_op = None;
TokenOrRedirect::Op(atom, op) => {
if is_prefix!(op.get_spec()) {
self.set_parent_of_first_op(Some(DirectedOp::Left(atom, op)));
}

self.print_op(atom.as_str());
}
TokenOrRedirect::NumberedVar(num_var) => append_str!(self, &num_var),
Expand Down Expand Up @@ -2020,5 +2014,19 @@ mod tests {
all_cells_unmarked(&wam.machine_st.heap);

assert_eq!(&wam.parse_and_print_term("[a|[b|c]*d].").unwrap(), "[a|[b|c]*d]");

all_cells_unmarked(&wam.machine_st.heap);

wam.op_dir.insert(
(atom!("fy"), Fixity::Pre),
OpDesc::build_with(9, FY as u8),
);

wam.op_dir.insert(
(atom!("yf"), Fixity::Post),
OpDesc::build_with(9, YF as u8),
);

assert_eq!(&wam.parse_and_print_term("(fy (fy 1)yf)yf.").unwrap(), "(fy (fy 1)yf)yf");
}
}

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