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provide read_term_from_chars/2 (#334)

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This commit is contained in:
Mark Thom
2020-04-12 17:26:11 -06:00
parent 7621155a89
commit d3a9392421
6 changed files with 147 additions and 63 deletions
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103
src/prolog/machine/system_calls.rs
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@@ -421,62 +421,6 @@ impl MachineState {
})
}
fn read_term(
&mut self,
current_input_stream: &mut Stream,
indices: &mut IndexStore,
) -> CallResult {
match self.read(
&mut parsing_stream(current_input_stream.clone()),
indices.atom_tbl.clone(),
&indices.op_dir,
) {
Ok(term_write_result) => {
let a1 = self[temp_v!(1)];
self.unify(Addr::HeapCell(term_write_result.heap_loc), a1);
if self.fail {
return Ok(());
}
let mut list_of_var_eqs = vec![];
for (var, binding) in term_write_result.var_dict.into_iter().rev() {
let var_atom = clause_name!(var.to_string(), indices.atom_tbl);
let h = self.heap.h();
let spec = fetch_atom_op_spec(clause_name!("="), None, &indices.op_dir);
self.heap.push(HeapCellValue::NamedStr(2, clause_name!("="), spec));
self.heap.push(HeapCellValue::Atom(var_atom, None));
self.heap.push(HeapCellValue::Addr(binding));
list_of_var_eqs.push(Addr::Str(h));
}
let a2 = self[temp_v!(2)];
let list_offset =
Addr::HeapCell(self.heap.to_list(list_of_var_eqs.into_iter()));
Ok(self.unify(list_offset, a2))
}
Err(err) => {
if let ParserError::UnexpectedEOF = err {
std::process::exit(0);
}
// reset the input stream after an input failure.
*current_input_stream = readline::input_stream();
let h = self.heap.h();
let syntax_error = MachineError::syntax_error(h, err);
let stub = MachineError::functor_stub(clause_name!("read_term"), 2);
Err(self.error_form(syntax_error, stub))
}
}
}
#[inline]
fn install_new_block(&mut self, r: RegType) -> usize {
self.block = self.b;
@@ -2479,6 +2423,15 @@ impl MachineState {
self.unify(target, module);
}
HeapCellValue::Addr(addr) if addr.is_ref() => {
let err = MachineError::uninstantiation_error(addr);
let stub = MachineError::functor_stub(
clause_name!("$module_of"),
2,
);
return Err(self.error_form(err, stub));
}
_ => {
unreachable!()
}
@@ -3062,6 +3015,44 @@ impl MachineState {
readline::set_prompt(false);
self.read_term(current_input_stream, indices)?;
}
&SystemClauseType::ReadTermFromChars => {
let mut heap_pstr_iter = self.heap_pstr_iter(self[temp_v!(1)]);
let chars = heap_pstr_iter.to_string();
if let Addr::EmptyList = heap_pstr_iter.focus() {
let term_write_result =
match self.read(
&mut parsing_stream(Stream::from(chars)),
indices.atom_tbl.clone(),
&indices.op_dir,
) {
Ok(term_write_result) => {
term_write_result
}
Err(e) => {
let stub = MachineError::functor_stub(
clause_name!("read_term_from_chars"),
2,
);
let h = self.heap.h();
let e = MachineError::session_error(h, SessionError::from(e));
return Err(self.error_form(e, stub));
}
};
let result = Addr::HeapCell(term_write_result.heap_loc);
if let Some(var) = self.store(self.deref(self[temp_v!(2)])).as_var() {
self.bind(var, result);
} else {
unreachable!()
}
} else {
unreachable!()
}
}
&SystemClauseType::ResetBlock => {
let addr = self.deref(self[temp_v!(1)]);
self.reset_block(addr);