rishi/scryer-prolog
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

address issues #104, #105, #103

Browse Source
This commit is contained in:
Mark Thom
2019-04-20 20:13:19 -03:00
parent e089c8bdd2
commit c8c8c5abae
5 changed files with 29 additions and 54 deletions
Download Patch File Download Diff File Expand all files Collapse all files

36
src/prolog/machine/system_calls.rs
View File

@@ -310,6 +310,20 @@ impl MachineState {
}
}
fn int_to_char_code(&mut self, n: Rc<BigInt>, stub: &'static str, arity: usize)
-> Result<u8, MachineStub>
{
if let Some(c) = n.to_u8() {
Ok(c)
} else {
let stub = MachineError::functor_stub(clause_name!(stub), arity);
let err = MachineError::representation_error(RepFlag::CharacterCode);
let err = self.error_form(err, stub);
Err(err)
}
}
pub(super) fn system_call(&mut self,
ct: &SystemClauseType,
indices: &mut IndexStore,
@@ -444,6 +458,10 @@ impl MachineState {
for addr in addrs.iter() {
match addr {
&Addr::Con(Constant::Number(Number::Integer(ref n))) => {
let c = self.int_to_char_code(n.clone(), "atom_codes", 2)?;
chars.push(c as char);
},
&Addr::Con(Constant::CharCode(c)) =>
chars.push(c as char),
_ => {
@@ -516,16 +534,10 @@ impl MachineState {
match self.store(self.deref(a2)) {
Addr::Con(Constant::CharCode(code)) =>
self.unify(Addr::Con(Constant::Char(code as char)), addr.clone()),
Addr::Con(Constant::Number(Number::Integer(n))) =>
if let Some(c) = n.to_u8() {
self.unify(Addr::Con(Constant::Char(c as char)), addr.clone());
} else {
let stub = MachineError::functor_stub(clause_name!("char_code"), 2);
let err = MachineError::representation_error(RepFlag::CharacterCode);
let err = self.error_form(err, stub);
return Err(err);
},
Addr::Con(Constant::Number(Number::Integer(n))) => {
let c = self.int_to_char_code(n, "char_code", 2)?;
self.unify(Addr::Con(Constant::Char(c as char)), addr.clone());
},
_ => self.fail = true
};
},
@@ -556,8 +568,6 @@ impl MachineState {
};
},
&SystemClauseType::GetChar => {
readline::toggle_prompt(false);
let result = parsing_stream.next();
let a1 = self[temp_v!(1)].clone();
@@ -1408,8 +1418,6 @@ impl MachineState {
self.install_new_block(temp_v!(1));
},
&SystemClauseType::ReadTerm => {
readline::toggle_prompt(true);
match self.read(parsing_stream, indices.atom_tbl.clone(), &indices.op_dir) {
Ok(term_write_result) => {
let a1 = self[temp_v!(1)].clone();