1030 lines
32 KiB
Rust
1030 lines
32 KiB
Rust
use prolog_parser::ast::*;
|
|
use prolog_parser::string_list::*;
|
|
|
|
use crate::prolog::clause_types::*;
|
|
use crate::prolog::forms::*;
|
|
use crate::prolog::heap_iter::*;
|
|
use crate::prolog::machine::machine_indices::*;
|
|
use crate::prolog::machine::machine_state::*;
|
|
use crate::prolog::ordered_float::OrderedFloat;
|
|
use crate::prolog::rug::Integer;
|
|
|
|
use indexmap::{IndexMap, IndexSet};
|
|
|
|
use std::cell::Cell;
|
|
use std::iter::once;
|
|
use std::ops::{Range, RangeFrom};
|
|
use std::rc::Rc;
|
|
|
|
/* contains the location, name, precision and Specifier of the parent op. */
|
|
#[derive(Clone)]
|
|
pub enum DirectedOp {
|
|
Left(ClauseName, SharedOpDesc),
|
|
Right(ClauseName, SharedOpDesc),
|
|
}
|
|
|
|
impl DirectedOp {
|
|
#[inline]
|
|
fn as_str(&self) -> &str {
|
|
match self {
|
|
&DirectedOp::Left(ref name, _) | &DirectedOp::Right(ref name, _) => name.as_str(),
|
|
}
|
|
}
|
|
|
|
#[inline]
|
|
fn is_negative_sign(&self) -> bool {
|
|
match self {
|
|
&DirectedOp::Left(ref name, ref cell) | &DirectedOp::Right(ref name, ref cell) => {
|
|
name.as_str() == "-" && is_prefix!(cell.assoc())
|
|
}
|
|
}
|
|
}
|
|
|
|
#[inline]
|
|
fn is_left(&self) -> bool {
|
|
if let &DirectedOp::Left(..) = self {
|
|
true
|
|
} else {
|
|
false
|
|
}
|
|
}
|
|
}
|
|
|
|
fn needs_bracketing(child_spec: &SharedOpDesc, op: &DirectedOp) -> bool {
|
|
match op {
|
|
&DirectedOp::Left(ref name, ref cell) => {
|
|
let (priority, spec) = cell.get();
|
|
|
|
if name.as_str() == "-" {
|
|
let child_assoc = child_spec.assoc();
|
|
if is_prefix!(spec) && (is_postfix!(child_assoc) || is_infix!(child_assoc)) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
let is_strict_right = is_yfx!(spec) || is_xfx!(spec) || is_fx!(spec);
|
|
child_spec.prec() > priority || (child_spec.prec() == priority && is_strict_right)
|
|
}
|
|
&DirectedOp::Right(_, ref cell) => {
|
|
let (priority, spec) = cell.get();
|
|
let is_strict_left = is_xfx!(spec) || is_xfy!(spec) || is_xf!(spec);
|
|
|
|
if child_spec.prec() > priority || (child_spec.prec() == priority && is_strict_left) {
|
|
true
|
|
} else if (is_postfix!(spec) || is_infix!(spec)) && !is_postfix!(child_spec.assoc()) {
|
|
!SharedOpDesc::ptr_eq(&cell, &child_spec) && child_spec.prec() == priority
|
|
} else {
|
|
false
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
impl<'a> HCPreOrderIterator<'a> {
|
|
/*
|
|
* descend into the subtree where the iterator is currently parked
|
|
* and check that the leftmost leaf is a number, with every node
|
|
* encountered on the way an infix or postfix operator, unblocked
|
|
* by brackets.
|
|
*/
|
|
fn leftmost_leaf_has_property<P>(&self, property_check: P) -> bool
|
|
where
|
|
P: Fn(Constant) -> bool,
|
|
{
|
|
let mut addr = match self.state_stack.last().cloned() {
|
|
Some(addr) => addr,
|
|
None => return false,
|
|
};
|
|
|
|
let mut parent_spec = DirectedOp::Left(clause_name!("-"), SharedOpDesc::new(200, FY));
|
|
|
|
loop {
|
|
match self.machine_st.store(self.machine_st.deref(addr)) {
|
|
Addr::Str(s) => match &self.machine_st.heap[s] {
|
|
&HeapCellValue::NamedStr(_, ref name, Some(ref spec))
|
|
if is_postfix!(spec.assoc()) || is_infix!(spec.assoc()) =>
|
|
{
|
|
if needs_bracketing(spec, &parent_spec) {
|
|
return false;
|
|
} else {
|
|
addr = Addr::HeapCell(s + 1);
|
|
parent_spec = DirectedOp::Right(name.clone(), spec.clone());
|
|
}
|
|
}
|
|
_ => return false,
|
|
},
|
|
Addr::Con(Constant::Integer(n)) => return property_check(Constant::Integer(n)),
|
|
Addr::Con(Constant::Float(n)) => return property_check(Constant::Float(n)),
|
|
Addr::Con(Constant::Rational(n)) => return property_check(Constant::Rational(n)),
|
|
_ => return false,
|
|
}
|
|
}
|
|
}
|
|
|
|
fn immediate_leaf_has_property<P>(&self, property_check: P) -> bool
|
|
where
|
|
P: Fn(Constant) -> bool,
|
|
{
|
|
let addr = match self.state_stack.last().cloned() {
|
|
Some(addr) => addr,
|
|
None => return false,
|
|
};
|
|
|
|
match self.machine_st.store(self.machine_st.deref(addr)) {
|
|
Addr::Con(c) => property_check(c),
|
|
_ => false,
|
|
}
|
|
}
|
|
}
|
|
|
|
fn char_to_string(c: char) -> String {
|
|
match c {
|
|
'\'' => "\\'".to_string(),
|
|
'\n' => "\\n".to_string(),
|
|
'\r' => "\\r".to_string(),
|
|
'\t' => "\\t".to_string(),
|
|
'\u{0b}' => "\\v".to_string(), // UTF-8 vertical tab
|
|
'\u{0c}' => "\\f".to_string(), // UTF-8 form feed
|
|
'\u{08}' => "\\b".to_string(), // UTF-8 backspace
|
|
'\u{07}' => "\\a".to_string(), // UTF-8 alert
|
|
'\x20'..='\x7e' => c.to_string(),
|
|
_ => format!("\\x{:x}\\", c as u32),
|
|
}
|
|
}
|
|
|
|
#[derive(Clone)]
|
|
pub enum TokenOrRedirect {
|
|
Atom(ClauseName),
|
|
Op(ClauseName, SharedOpDesc),
|
|
NumberedVar(String),
|
|
CompositeRedirect(DirectedOp),
|
|
FunctorRedirect,
|
|
Open,
|
|
Close,
|
|
Comma,
|
|
Space,
|
|
LeftCurly,
|
|
RightCurly,
|
|
OpenList(Rc<Cell<bool>>),
|
|
CloseList(Rc<Cell<bool>>),
|
|
HeadTailSeparator,
|
|
}
|
|
|
|
pub trait HCValueOutputter {
|
|
type Output;
|
|
|
|
fn new() -> Self;
|
|
fn push_char(&mut self, _: char);
|
|
fn append(&mut self, _: &str);
|
|
fn begin_new_var(&mut self);
|
|
fn insert(&mut self, _: usize, _: char);
|
|
fn result(self) -> Self::Output;
|
|
fn ends_with(&self, _: &str) -> bool;
|
|
fn len(&self) -> usize;
|
|
fn truncate(&mut self, _: usize);
|
|
fn range(&self, _: Range<usize>) -> &str;
|
|
fn range_from(&self, _: RangeFrom<usize>) -> &str;
|
|
}
|
|
|
|
pub struct PrinterOutputter {
|
|
contents: String,
|
|
}
|
|
|
|
impl HCValueOutputter for PrinterOutputter {
|
|
type Output = String;
|
|
|
|
fn new() -> Self {
|
|
PrinterOutputter {
|
|
contents: String::new(),
|
|
}
|
|
}
|
|
|
|
fn append(&mut self, contents: &str) {
|
|
if requires_space(&self.contents, contents) {
|
|
self.push_char(' ');
|
|
}
|
|
|
|
self.contents += contents;
|
|
}
|
|
|
|
fn push_char(&mut self, c: char) {
|
|
self.contents.push(c);
|
|
}
|
|
|
|
fn begin_new_var(&mut self) {
|
|
if self.contents.len() != 0 {
|
|
self.contents += ", ";
|
|
}
|
|
}
|
|
|
|
fn insert(&mut self, idx: usize, c: char) {
|
|
self.contents.insert(idx, c);
|
|
}
|
|
|
|
fn result(self) -> Self::Output {
|
|
self.contents
|
|
}
|
|
|
|
fn ends_with(&self, s: &str) -> bool {
|
|
self.contents.ends_with(s)
|
|
}
|
|
|
|
fn len(&self) -> usize {
|
|
self.contents.len()
|
|
}
|
|
|
|
fn truncate(&mut self, len: usize) {
|
|
self.contents.truncate(len);
|
|
}
|
|
|
|
fn range(&self, index: Range<usize>) -> &str {
|
|
&self.contents.as_str()[index]
|
|
}
|
|
|
|
fn range_from(&self, index: RangeFrom<usize>) -> &str {
|
|
&self.contents.as_str()[index]
|
|
}
|
|
}
|
|
|
|
#[inline]
|
|
fn is_numbered_var(ct: &ClauseType, arity: usize) -> bool {
|
|
arity == 1 && ct.name().as_str() == "$VAR"
|
|
}
|
|
|
|
#[inline]
|
|
fn negated_op_needs_bracketing(iter: &HCPreOrderIterator, op: &Option<DirectedOp>) -> bool {
|
|
if let &Some(ref op) = op {
|
|
op.is_negative_sign()
|
|
&& iter.leftmost_leaf_has_property(|c| match c {
|
|
Constant::Integer(n) => n > 0,
|
|
Constant::Float(f) => f > OrderedFloat(0f64),
|
|
Constant::Rational(r) => r > 0,
|
|
_ => false,
|
|
})
|
|
} else {
|
|
false
|
|
}
|
|
}
|
|
|
|
impl MachineState {
|
|
pub fn numbervar(&self, offset: &Integer, addr: Addr) -> Option<Var> {
|
|
static CHAR_CODES: [char; 26] = [
|
|
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q',
|
|
'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
|
|
];
|
|
|
|
match self.store(self.deref(addr)) {
|
|
Addr::Con(Constant::Integer(ref n)) if n >= &0 => {
|
|
let n = Integer::from(offset + n);
|
|
|
|
let i = n.mod_u(26) as usize;
|
|
let j = n.div_rem_floor(Integer::from(26));
|
|
let j = <(Integer, Integer)>::from(j).1;
|
|
|
|
Some(if j == 0 {
|
|
CHAR_CODES[i].to_string()
|
|
} else {
|
|
format!("{}{}", CHAR_CODES[i], j)
|
|
})
|
|
}
|
|
_ => None,
|
|
}
|
|
}
|
|
}
|
|
|
|
type ReverseHeapVarDict = IndexMap<Addr, Rc<Var>>;
|
|
|
|
pub struct HCPrinter<'a, Outputter> {
|
|
outputter: Outputter,
|
|
machine_st: &'a MachineState,
|
|
op_dir: &'a OpDir,
|
|
state_stack: Vec<TokenOrRedirect>,
|
|
toplevel_spec: Option<DirectedOp>,
|
|
heap_locs: ReverseHeapVarDict,
|
|
printed_vars: IndexSet<Addr>,
|
|
last_item_idx: usize,
|
|
cyclic_terms: IndexMap<Addr, usize>,
|
|
pub(crate) var_names: IndexMap<Addr, String>,
|
|
pub(crate) numbervars_offset: Integer,
|
|
pub(crate) numbervars: bool,
|
|
pub(crate) quoted: bool,
|
|
pub(crate) ignore_ops: bool,
|
|
}
|
|
|
|
macro_rules! push_space_if_amb {
|
|
($self:expr, $atom:expr, $action:block) => {
|
|
if $self.ambiguity_check($atom) {
|
|
$self.outputter.push_char(' ');
|
|
$action;
|
|
} else {
|
|
$action;
|
|
}
|
|
};
|
|
}
|
|
|
|
pub fn requires_space(atom: &str, op: &str) -> bool {
|
|
match atom.chars().last() {
|
|
Some(ac) => op
|
|
.chars()
|
|
.next()
|
|
.map(|oc| {
|
|
if ac == '0' {
|
|
oc == '\'' || oc == '(' || alpha_numeric_char!(oc)
|
|
} else if alpha_numeric_char!(ac) {
|
|
oc == '(' || alpha_numeric_char!(oc)
|
|
} else if graphic_token_char!(ac) {
|
|
graphic_token_char!(oc)
|
|
} else if variable_indicator_char!(ac) {
|
|
alpha_numeric_char!(oc)
|
|
} else if capital_letter_char!(ac) {
|
|
alpha_numeric_char!(oc)
|
|
} else if sign_char!(ac) {
|
|
sign_char!(oc) || decimal_digit_char!(oc)
|
|
} else if single_quote_char!(ac) {
|
|
single_quote_char!(oc)
|
|
} else {
|
|
false
|
|
}
|
|
})
|
|
.unwrap_or(false),
|
|
_ => false,
|
|
}
|
|
}
|
|
|
|
fn reverse_heap_locs<'a>(machine_st: &'a MachineState) -> ReverseHeapVarDict {
|
|
machine_st
|
|
.heap_locs
|
|
.iter()
|
|
.map(|(var, var_addr)| {
|
|
(
|
|
machine_st.store(machine_st.deref(var_addr.clone())),
|
|
var.clone(),
|
|
)
|
|
})
|
|
.collect()
|
|
}
|
|
|
|
fn non_quoted_graphic_token<Iter: Iterator<Item = char>>(mut iter: Iter, c: char) -> bool {
|
|
if c == '/' {
|
|
return match iter.next() {
|
|
None => true,
|
|
Some('*') => false, // if we start with comment token, we must quote.
|
|
Some(c) => {
|
|
if graphic_token_char!(c) {
|
|
iter.all(|c| graphic_token_char!(c))
|
|
} else {
|
|
false
|
|
}
|
|
}
|
|
};
|
|
} else if c == '.' {
|
|
return match iter.next() {
|
|
None => false,
|
|
Some(c) => {
|
|
if graphic_token_char!(c) {
|
|
iter.all(|c| graphic_token_char!(c))
|
|
} else {
|
|
false
|
|
}
|
|
}
|
|
};
|
|
} else {
|
|
iter.all(|c| graphic_token_char!(c))
|
|
}
|
|
}
|
|
|
|
fn non_quoted_token<Iter: Iterator<Item = char>>(mut iter: Iter) -> bool {
|
|
if let Some(c) = iter.next() {
|
|
if small_letter_char!(c) {
|
|
iter.all(|c| alpha_numeric_char!(c))
|
|
} else if graphic_token_char!(c) {
|
|
non_quoted_graphic_token(iter, c)
|
|
} else if semicolon_char!(c) {
|
|
iter.next().is_none()
|
|
} else if cut_char!(c) {
|
|
iter.next().is_none()
|
|
} else if c == '[' {
|
|
(iter.next() == Some(']') && iter.next().is_none())
|
|
} else if c == '{' {
|
|
(iter.next() == Some('}') && iter.next().is_none())
|
|
} else if solo_char!(c) {
|
|
!(c == ')' || c == '}' || c == ']' || c == ',' || c == '%' || c == '|')
|
|
} else {
|
|
false
|
|
}
|
|
} else {
|
|
false
|
|
}
|
|
}
|
|
|
|
impl<'a, Outputter: HCValueOutputter> HCPrinter<'a, Outputter> {
|
|
pub fn new(machine_st: &'a MachineState, op_dir: &'a OpDir, output: Outputter) -> Self {
|
|
HCPrinter {
|
|
outputter: output,
|
|
machine_st,
|
|
op_dir,
|
|
state_stack: vec![],
|
|
heap_locs: ReverseHeapVarDict::new(),
|
|
toplevel_spec: None,
|
|
printed_vars: IndexSet::new(),
|
|
last_item_idx: 0,
|
|
numbervars: false,
|
|
numbervars_offset: Integer::from(0),
|
|
quoted: false,
|
|
ignore_ops: false,
|
|
cyclic_terms: IndexMap::new(),
|
|
var_names: IndexMap::new(),
|
|
}
|
|
}
|
|
|
|
pub fn from_heap_locs(
|
|
machine_st: &'a MachineState,
|
|
op_dir: &'a OpDir,
|
|
output: Outputter,
|
|
) -> Self {
|
|
let mut printer = Self::new(machine_st, op_dir, output);
|
|
|
|
printer.toplevel_spec = Some(DirectedOp::Right(
|
|
clause_name!("="),
|
|
SharedOpDesc::new(700, XFX),
|
|
));
|
|
printer.heap_locs = reverse_heap_locs(machine_st);
|
|
|
|
printer
|
|
}
|
|
|
|
pub fn drop_toplevel_spec(&mut self) {
|
|
self.toplevel_spec = None;
|
|
}
|
|
|
|
#[inline]
|
|
pub fn see_all_locs(&mut self) {
|
|
for key in self.heap_locs.keys().cloned() {
|
|
self.printed_vars.insert(key);
|
|
}
|
|
}
|
|
|
|
#[inline]
|
|
fn ambiguity_check(&self, atom: &str) -> bool {
|
|
let tail = self.outputter.range_from(self.last_item_idx..);
|
|
requires_space(tail, atom)
|
|
}
|
|
|
|
fn enqueue_op(&mut self, ct: ClauseType, spec: SharedOpDesc) {
|
|
if is_postfix!(spec.assoc()) {
|
|
let right_directed_op = DirectedOp::Right(ct.name(), spec.clone());
|
|
|
|
self.state_stack.push(TokenOrRedirect::Op(ct.name(), spec));
|
|
self.state_stack
|
|
.push(TokenOrRedirect::CompositeRedirect(right_directed_op));
|
|
} else if is_prefix!(spec.assoc()) {
|
|
match ct.name().as_str() {
|
|
"-" | "\\" => {
|
|
self.format_prefix_op_with_space(ct.name(), spec);
|
|
return;
|
|
}
|
|
_ => {}
|
|
};
|
|
|
|
let left_directed_op = DirectedOp::Left(ct.name(), spec.clone());
|
|
|
|
self.state_stack
|
|
.push(TokenOrRedirect::CompositeRedirect(left_directed_op));
|
|
self.state_stack.push(TokenOrRedirect::Op(ct.name(), spec));
|
|
} else {
|
|
// if is_infix!(spec.assoc())
|
|
match ct.name().as_str() {
|
|
"|" => {
|
|
self.format_bar_separator_op(ct.name(), spec);
|
|
return;
|
|
}
|
|
_ => {}
|
|
};
|
|
|
|
let left_directed_op = DirectedOp::Left(ct.name(), spec.clone());
|
|
let right_directed_op = DirectedOp::Right(ct.name(), spec.clone());
|
|
|
|
self.state_stack
|
|
.push(TokenOrRedirect::CompositeRedirect(left_directed_op));
|
|
self.state_stack.push(TokenOrRedirect::Op(ct.name(), spec));
|
|
self.state_stack
|
|
.push(TokenOrRedirect::CompositeRedirect(right_directed_op));
|
|
}
|
|
}
|
|
|
|
fn format_struct(&mut self, arity: usize, name: ClauseName) {
|
|
self.state_stack.push(TokenOrRedirect::Close);
|
|
|
|
for _ in 0..arity {
|
|
self.state_stack.push(TokenOrRedirect::FunctorRedirect);
|
|
self.state_stack.push(TokenOrRedirect::Comma);
|
|
}
|
|
|
|
self.state_stack.pop();
|
|
self.state_stack.push(TokenOrRedirect::Open);
|
|
|
|
self.state_stack.push(TokenOrRedirect::Atom(name));
|
|
}
|
|
|
|
fn format_prefix_op_with_space(&mut self, name: ClauseName, spec: SharedOpDesc) {
|
|
let op = DirectedOp::Left(name.clone(), spec);
|
|
|
|
self.state_stack
|
|
.push(TokenOrRedirect::CompositeRedirect(op));
|
|
self.state_stack.push(TokenOrRedirect::Space);
|
|
self.state_stack.push(TokenOrRedirect::Atom(name));
|
|
}
|
|
|
|
fn format_bar_separator_op(&mut self, name: ClauseName, spec: SharedOpDesc) {
|
|
let left_directed_op = DirectedOp::Left(name.clone(), spec.clone());
|
|
let right_directed_op = DirectedOp::Right(name.clone(), spec.clone());
|
|
|
|
self.state_stack
|
|
.push(TokenOrRedirect::CompositeRedirect(left_directed_op));
|
|
self.state_stack.push(TokenOrRedirect::HeadTailSeparator);
|
|
self.state_stack
|
|
.push(TokenOrRedirect::CompositeRedirect(right_directed_op));
|
|
}
|
|
|
|
fn format_curly_braces(&mut self) {
|
|
self.state_stack.push(TokenOrRedirect::RightCurly);
|
|
self.state_stack.push(TokenOrRedirect::FunctorRedirect);
|
|
self.state_stack.push(TokenOrRedirect::LeftCurly);
|
|
}
|
|
|
|
fn format_numbered_vars(&mut self, iter: &mut HCPreOrderIterator) -> bool {
|
|
let addr = iter.stack().last().cloned().unwrap();
|
|
|
|
// 7.10.4
|
|
if let Some(var) = iter.machine_st().numbervar(&self.numbervars_offset, addr) {
|
|
iter.stack().pop();
|
|
self.state_stack.push(TokenOrRedirect::NumberedVar(var));
|
|
return true;
|
|
}
|
|
|
|
false
|
|
}
|
|
|
|
fn format_clause(&mut self, iter: &mut HCPreOrderIterator, arity: usize, ct: ClauseType) {
|
|
if self.numbervars && is_numbered_var(&ct, arity) {
|
|
if self.format_numbered_vars(iter) {
|
|
return;
|
|
}
|
|
}
|
|
|
|
if let Some(spec) = ct.spec() {
|
|
if "." == ct.name().as_str() && is_infix!(spec.assoc()) {
|
|
if !self.ignore_ops {
|
|
self.push_list();
|
|
return;
|
|
}
|
|
}
|
|
|
|
if !self.ignore_ops && spec.prec() > 0 {
|
|
return self.enqueue_op(ct, spec);
|
|
}
|
|
}
|
|
|
|
match (ct.name().as_str(), arity) {
|
|
("{}", 1) if !self.ignore_ops => self.format_curly_braces(),
|
|
_ => self.format_struct(arity, ct.name()),
|
|
};
|
|
}
|
|
|
|
#[inline]
|
|
fn push_char(&mut self, c: char) {
|
|
self.outputter.push_char(c);
|
|
self.last_item_idx = self.outputter.len();
|
|
}
|
|
|
|
#[inline]
|
|
fn append_str(&mut self, s: &str) {
|
|
self.last_item_idx = self.outputter.len();
|
|
self.outputter.append(s);
|
|
}
|
|
|
|
fn offset_as_string(&self, iter: &mut HCPreOrderIterator, addr: Addr) -> Option<String> {
|
|
if let Some(var) = self.var_names.get(&addr) {
|
|
if addr.as_var().is_some() {
|
|
return Some(format!("{}", var));
|
|
} else {
|
|
iter.stack().push(addr);
|
|
return None;
|
|
}
|
|
}
|
|
|
|
match addr {
|
|
Addr::AttrVar(h) => Some(format!("_{}", h + 1)),
|
|
Addr::HeapCell(h) | Addr::Lis(h) | Addr::Str(h) => Some(format!("_{}", h)),
|
|
Addr::StackCell(fr, sc) => Some(format!("_s_{}_{}", fr, sc)),
|
|
_ => None,
|
|
}
|
|
}
|
|
|
|
fn check_for_seen(&mut self, iter: &mut HCPreOrderIterator) -> Option<HeapCellValue> {
|
|
iter.stack().last().cloned().and_then(|addr| {
|
|
let addr = self.machine_st.store(self.machine_st.deref(addr));
|
|
|
|
if let Some(var) = self.var_names.get(&addr) {
|
|
self.heap_locs.insert(addr.clone(), Rc::new(var.clone()));
|
|
}
|
|
|
|
match self.heap_locs.get(&addr).cloned() {
|
|
Some(var) => {
|
|
if !self.printed_vars.contains(&addr) {
|
|
self.printed_vars.insert(addr);
|
|
return iter.next();
|
|
} else {
|
|
iter.stack().pop();
|
|
push_space_if_amb!(self, &var, {
|
|
self.append_str(&var);
|
|
});
|
|
|
|
return None;
|
|
}
|
|
}
|
|
None => {
|
|
if self.machine_st.is_cyclic_term(addr.clone()) {
|
|
match self.cyclic_terms.get(&addr).cloned() {
|
|
Some(reps) => {
|
|
if reps > 0 {
|
|
self.cyclic_terms.insert(addr, reps - 1);
|
|
iter.next()
|
|
} else {
|
|
push_space_if_amb!(self, "...", {
|
|
self.append_str("...");
|
|
});
|
|
|
|
iter.stack().pop();
|
|
self.cyclic_terms.swap_remove(&addr);
|
|
None
|
|
}
|
|
}
|
|
None => {
|
|
self.cyclic_terms.insert(addr, 2);
|
|
iter.next()
|
|
}
|
|
}
|
|
} else {
|
|
iter.next()
|
|
}
|
|
}
|
|
}
|
|
})
|
|
}
|
|
|
|
fn print_atom(&mut self, atom: &ClauseName) {
|
|
let result = self.print_op_addendum(atom.as_str());
|
|
|
|
push_space_if_amb!(self, result.as_str(), {
|
|
self.append_str(&result);
|
|
});
|
|
}
|
|
|
|
fn print_op_addendum(&mut self, atom: &str) -> String {
|
|
if !self.quoted || non_quoted_token(atom.chars()) {
|
|
atom.to_string()
|
|
} else if atom == "''" {
|
|
"''".to_string()
|
|
} else {
|
|
let mut result = String::new();
|
|
|
|
if self.quoted {
|
|
result.push('\'');
|
|
}
|
|
|
|
for c in atom.chars() {
|
|
result += &char_to_string(c);
|
|
}
|
|
|
|
if self.quoted {
|
|
result.push('\'');
|
|
}
|
|
|
|
result
|
|
}
|
|
}
|
|
|
|
fn print_op(&mut self, atom: &str) {
|
|
let result = if atom == "," {
|
|
",".to_string()
|
|
} else {
|
|
self.print_op_addendum(atom)
|
|
};
|
|
|
|
push_space_if_amb!(self, &result, {
|
|
self.append_str(&result);
|
|
});
|
|
}
|
|
|
|
fn print_number(&mut self, n: Number, op: &Option<DirectedOp>) {
|
|
let add_brackets = if let Some(op) = op {
|
|
op.is_negative_sign() && n.is_positive()
|
|
} else {
|
|
false
|
|
};
|
|
|
|
if add_brackets {
|
|
self.push_char('(');
|
|
}
|
|
|
|
match n {
|
|
Number::Float(fl) => {
|
|
if &fl == &OrderedFloat(0f64) {
|
|
push_space_if_amb!(self, "0", {
|
|
self.append_str("0");
|
|
});
|
|
} else {
|
|
let OrderedFloat(fl) = fl;
|
|
let output_str = format!("{0:<20?}", fl);
|
|
|
|
push_space_if_amb!(self, &output_str, {
|
|
self.append_str(&output_str.trim());
|
|
});
|
|
}
|
|
}
|
|
n => {
|
|
let output_str = format!("{}", n);
|
|
|
|
push_space_if_amb!(self, &output_str, {
|
|
self.append_str(&output_str);
|
|
});
|
|
}
|
|
}
|
|
|
|
if add_brackets {
|
|
self.push_char(')');
|
|
}
|
|
}
|
|
|
|
fn print_constant(&mut self, c: Constant, op: &Option<DirectedOp>) {
|
|
match c {
|
|
Constant::Atom(atom, spec) => {
|
|
if let Some(_) = fetch_atom_op_spec(atom.clone(), spec, self.op_dir) {
|
|
let mut result = String::new();
|
|
|
|
if let Some(ref op) = op {
|
|
if self.outputter.ends_with(&format!(" {}", op.as_str())) {
|
|
result.push(' ');
|
|
}
|
|
|
|
result.push('(');
|
|
}
|
|
|
|
result += &self.print_op_addendum(atom.as_str());
|
|
|
|
if op.is_some() {
|
|
result.push(')');
|
|
}
|
|
|
|
push_space_if_amb!(self, &result, {
|
|
self.append_str(&result);
|
|
});
|
|
} else {
|
|
push_space_if_amb!(self, atom.as_str(), {
|
|
self.print_atom(&atom);
|
|
});
|
|
}
|
|
}
|
|
Constant::Char(c) if non_quoted_token(once(c)) => {
|
|
let c = char_to_string(c);
|
|
|
|
push_space_if_amb!(self, &c, {
|
|
self.append_str(c.as_str());
|
|
});
|
|
}
|
|
Constant::Char(c) => {
|
|
let mut result = String::new();
|
|
|
|
if self.quoted {
|
|
result.push('\'');
|
|
result += &char_to_string(c);
|
|
result.push('\'');
|
|
} else {
|
|
result += &char_to_string(c);
|
|
}
|
|
|
|
push_space_if_amb!(self, &result, {
|
|
self.append_str(result.as_str());
|
|
});
|
|
}
|
|
Constant::CharCode(c) => self.append_str(&format!("{}", c)),
|
|
Constant::EmptyList => self.append_str("[]"),
|
|
Constant::Integer(n) => self.print_number(Number::Integer(n), op),
|
|
Constant::Float(n) => self.print_number(Number::Float(n), op),
|
|
Constant::Rational(n) => self.print_number(Number::Rational(n), op),
|
|
Constant::String(s) => self.print_string(s),
|
|
Constant::Usize(i) => self.append_str(&format!("u{}", i)),
|
|
}
|
|
}
|
|
|
|
fn print_string(&mut self, s: StringList) {
|
|
match self.machine_st.machine_flags().double_quotes {
|
|
DoubleQuotes::Chars | DoubleQuotes::Codes => {
|
|
if !s.is_empty() {
|
|
if self.ignore_ops {
|
|
self.format_struct(2, clause_name!("."));
|
|
} else {
|
|
self.push_list();
|
|
}
|
|
} else if s.is_expandable() {
|
|
if !self.at_cdr("|_") {
|
|
self.push_char('_');
|
|
}
|
|
} else if !self.at_cdr("") {
|
|
self.append_str("[]");
|
|
}
|
|
}
|
|
DoubleQuotes::Atom => {
|
|
let borrowed_str = s.borrow();
|
|
let mut atom = String::new();
|
|
|
|
for c in borrowed_str[s.cursor()..].chars() {
|
|
atom += &char_to_string(c);
|
|
}
|
|
|
|
self.push_char('"');
|
|
self.append_str(&atom);
|
|
self.push_char('"');
|
|
}
|
|
}
|
|
}
|
|
|
|
fn push_list(&mut self) {
|
|
let cell = Rc::new(Cell::new(true));
|
|
|
|
self.state_stack
|
|
.push(TokenOrRedirect::CloseList(cell.clone()));
|
|
|
|
self.state_stack.push(TokenOrRedirect::FunctorRedirect);
|
|
self.state_stack.push(TokenOrRedirect::HeadTailSeparator); // bar
|
|
self.state_stack.push(TokenOrRedirect::FunctorRedirect);
|
|
|
|
self.state_stack.push(TokenOrRedirect::OpenList(cell));
|
|
}
|
|
|
|
fn handle_op_as_struct(
|
|
&mut self,
|
|
name: ClauseName,
|
|
arity: usize,
|
|
iter: &mut HCPreOrderIterator,
|
|
op: &Option<DirectedOp>,
|
|
is_functor_redirect: bool,
|
|
spec: SharedOpDesc,
|
|
negated_operand: bool,
|
|
) {
|
|
let add_brackets = if !self.ignore_ops {
|
|
negated_operand
|
|
|| if let Some(ref op) = op {
|
|
if self.numbervars && arity == 1 && name.as_str() == "$VAR" {
|
|
!iter.immediate_leaf_has_property(|c| match c {
|
|
Constant::Integer(n) => n >= 0,
|
|
Constant::Float(f) => f >= OrderedFloat(0f64),
|
|
Constant::Rational(r) => r >= 0,
|
|
_ => false,
|
|
}) && needs_bracketing(&spec, op)
|
|
} else {
|
|
needs_bracketing(&spec, op)
|
|
}
|
|
} else {
|
|
is_functor_redirect && spec.prec() >= 1000
|
|
}
|
|
} else {
|
|
false
|
|
};
|
|
|
|
if add_brackets {
|
|
self.state_stack.push(TokenOrRedirect::Close);
|
|
}
|
|
|
|
let ct = ClauseType::from(name.clone(), arity, Some(spec));
|
|
self.format_clause(iter, arity, ct);
|
|
|
|
if add_brackets {
|
|
self.state_stack.push(TokenOrRedirect::Open);
|
|
|
|
if let Some(ref op) = &op {
|
|
if op.is_left() && requires_space(op.as_str(), "(") {
|
|
self.state_stack.push(TokenOrRedirect::Space);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
fn handle_heap_term(
|
|
&mut self,
|
|
iter: &mut HCPreOrderIterator,
|
|
op: Option<DirectedOp>,
|
|
is_functor_redirect: bool,
|
|
) {
|
|
let negated_operand = negated_op_needs_bracketing(iter, &op);
|
|
|
|
let heap_val = match self.check_for_seen(iter) {
|
|
Some(heap_val) => heap_val,
|
|
None => return,
|
|
};
|
|
|
|
match heap_val {
|
|
HeapCellValue::NamedStr(arity, name, spec) => {
|
|
let spec = fetch_op_spec(name.clone(), arity, spec.clone(), self.op_dir);
|
|
|
|
if let Some(spec) = spec {
|
|
self.handle_op_as_struct(
|
|
name,
|
|
arity,
|
|
iter,
|
|
&op,
|
|
is_functor_redirect,
|
|
spec,
|
|
negated_operand,
|
|
);
|
|
} else {
|
|
push_space_if_amb!(self, name.as_str(), {
|
|
let ct = ClauseType::from(name, arity, spec);
|
|
self.format_clause(iter, arity, ct);
|
|
});
|
|
}
|
|
}
|
|
HeapCellValue::Addr(Addr::Con(Constant::EmptyList)) => {
|
|
if !self.at_cdr("") {
|
|
self.append_str("[]");
|
|
}
|
|
}
|
|
HeapCellValue::Addr(Addr::Con(c)) => self.print_constant(c, &op),
|
|
HeapCellValue::Addr(Addr::Lis(_)) => {
|
|
if self.ignore_ops {
|
|
self.format_struct(2, clause_name!("."));
|
|
} else {
|
|
self.push_list();
|
|
}
|
|
}
|
|
HeapCellValue::Addr(addr) => {
|
|
if let Some(offset_str) = self.offset_as_string(iter, addr) {
|
|
push_space_if_amb!(self, &offset_str, {
|
|
self.append_str(offset_str.as_str());
|
|
})
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
fn at_cdr(&mut self, tr: &str) -> bool {
|
|
let len = self.outputter.len();
|
|
|
|
if self.outputter.ends_with("|") {
|
|
self.outputter.truncate(len - "|".len());
|
|
self.append_str(tr);
|
|
|
|
true
|
|
} else {
|
|
false
|
|
}
|
|
}
|
|
|
|
pub fn print(mut self, addr: Addr) -> Outputter {
|
|
let mut iter = self.machine_st.pre_order_iter(addr);
|
|
|
|
loop {
|
|
if let Some(loc_data) = self.state_stack.pop() {
|
|
match loc_data {
|
|
TokenOrRedirect::Atom(atom) => self.print_atom(&atom),
|
|
TokenOrRedirect::Op(atom, _) => self.print_op(atom.as_str()),
|
|
TokenOrRedirect::NumberedVar(num_var) => self.append_str(num_var.as_str()),
|
|
TokenOrRedirect::CompositeRedirect(op) => {
|
|
self.handle_heap_term(&mut iter, Some(op), false)
|
|
}
|
|
TokenOrRedirect::FunctorRedirect => {
|
|
self.handle_heap_term(&mut iter, None, true)
|
|
}
|
|
TokenOrRedirect::Close => self.push_char(')'),
|
|
TokenOrRedirect::Open => self.push_char('('),
|
|
TokenOrRedirect::OpenList(delimit) => {
|
|
if !self.at_cdr(",") {
|
|
self.push_char('[');
|
|
} else {
|
|
delimit.set(false);
|
|
}
|
|
}
|
|
TokenOrRedirect::CloseList(delimit) => {
|
|
if delimit.get() {
|
|
self.push_char(']');
|
|
}
|
|
}
|
|
TokenOrRedirect::HeadTailSeparator => self.append_str("|"),
|
|
TokenOrRedirect::Comma => self.append_str(","),
|
|
TokenOrRedirect::Space => self.push_char(' '),
|
|
TokenOrRedirect::LeftCurly => self.push_char('{'),
|
|
TokenOrRedirect::RightCurly => self.push_char('}'),
|
|
}
|
|
} else if !iter.stack().is_empty() {
|
|
let spec = self.toplevel_spec.take();
|
|
self.handle_heap_term(&mut iter, spec, false);
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
|
|
self.outputter
|
|
}
|
|
}
|