use rug::{Integer, Rational};
use ordered_float::*;
use tabled_rc::*;
use put_back_n::*;
use std::cell::Cell;
use std::cmp::Ordering;
use std::collections::HashMap;
use std::fmt;
use std::hash::{Hash, Hasher};
use std::io::{Bytes, Error as IOError, Read};
use std::rc::Rc;
use std::vec::Vec;
use unicode_reader::CodePoints;
pub type Atom = String;
pub type Var = String;
pub type Specifier = u32;
pub const MAX_ARITY: usize = 1023;
pub const XFX: u32 = 0x0001;
pub const XFY: u32 = 0x0002;
pub const YFX: u32 = 0x0004;
pub const XF: u32 = 0x0010;
pub const YF: u32 = 0x0020;
pub const FX: u32 = 0x0040;
pub const FY: u32 = 0x0080;
pub const DELIMITER: u32 = 0x0100;
pub const TERM: u32 = 0x1000;
pub const LTERM: u32 = 0x3000;
pub const NEGATIVE_SIGN: u32 = 0x0200;
#[macro_export]
macro_rules! clause_name {
($name: expr, $tbl: expr) => (
ClauseName::User(TabledRc::new($name, $tbl.clone()))
) ;
($name: expr) => (
ClauseName::BuiltIn($name)
)
}
#[macro_export]
macro_rules! atom {
($e:expr, $tbl:expr) => (
Constant::Atom(ClauseName::User(tabled_rc!($e, $tbl)), None)
);
($e:expr) => (
Constant::Atom(clause_name!($e), None)
)
}
#[macro_export]
macro_rules! rc_atom {
($e:expr) => (
Rc::new(String::from($e))
)
}
macro_rules! is_term {
($x:expr) => ( ($x & TERM) != 0 )
}
macro_rules! is_lterm {
($x:expr) => ( ($x & LTERM) != 0 )
}
macro_rules! is_op {
($x:expr) => ( $x & (XF | YF | FX | FY | XFX | XFY | YFX) != 0 )
}
macro_rules! is_negate {
($x:expr) => ( ($x & NEGATIVE_SIGN) != 0 )
}
#[macro_export]
macro_rules! is_prefix {
($x:expr) => ( $x & (FX | FY) != 0 )
}
#[macro_export]
macro_rules! is_postfix {
($x:expr) => ( $x & (XF | YF) != 0 )
}
#[macro_export]
macro_rules! is_infix {
($x:expr) => ( ($x & (XFX | XFY | YFX)) != 0 )
}
#[macro_export]
macro_rules! is_xfx {
($x:expr) => ( ($x & XFX) != 0 )
}
#[macro_export]
macro_rules! is_xfy {
($x:expr) => ( ($x & XFY) != 0 )
}
#[macro_export]
macro_rules! is_yfx {
($x:expr) => ( ($x & YFX) != 0 )
}
#[macro_export]
macro_rules! is_yf {
($x:expr) => ( ($x & YF) != 0 )
}
#[macro_export]
macro_rules! is_xf {
($x:expr) => ( ($x & XF) != 0 )
}
#[macro_export]
macro_rules! is_fx {
($x:expr) => ( ($x & FX) != 0 )
}
#[macro_export]
macro_rules! is_fy {
($x:expr) => ( ($x & FY) != 0 )
}
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub enum RegType {
Perm(usize),
Temp(usize)
}
impl Default for RegType {
fn default() -> Self {
RegType::Temp(0)
}
}
impl RegType {
pub fn reg_num(self) -> usize {
match self {
RegType::Perm(reg_num) | RegType::Temp(reg_num) => reg_num
}
}
pub fn is_perm(self) -> bool {
match self {
RegType::Perm(_) => true,
_ => false
}
}
}
impl fmt::Display for RegType {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
&RegType::Perm(val) => write!(f, "Y{}", val),
&RegType::Temp(val) => write!(f, "X{}", val)
}
}
}
#[derive(Debug, PartialEq, Eq, Clone, Copy)]
pub enum VarReg {
ArgAndNorm(RegType, usize),
Norm(RegType)
}
impl VarReg {
pub fn norm(self) -> RegType {
match self {
VarReg::ArgAndNorm(reg, _) | VarReg::Norm(reg) => reg
}
}
}
impl fmt::Display for VarReg {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
&VarReg::Norm(RegType::Perm(reg)) => write!(f, "Y{}", reg),
&VarReg::Norm(RegType::Temp(reg)) => write!(f, "X{}", reg),
&VarReg::ArgAndNorm(RegType::Perm(reg), arg) =>
write!(f, "Y{} A{}", reg, arg),
&VarReg::ArgAndNorm(RegType::Temp(reg), arg) =>
write!(f, "X{} A{}", reg, arg)
}
}
}
impl Default for VarReg {
fn default() -> Self {
VarReg::Norm(RegType::default())
}
}
#[macro_export]
macro_rules! temp_v {
($x:expr) => (
RegType::Temp($x)
)
}
#[macro_export]
macro_rules! perm_v {
($x:expr) => (
RegType::Perm($x)
)
}
#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord)]
pub enum GenContext {
Head, Mid(usize), Last(usize)
}
impl GenContext {
pub fn chunk_num(self) -> usize {
match self {
GenContext::Head => 0,
GenContext::Mid(cn) | GenContext::Last(cn) => cn
}
}
}
pub type OpDirKey = (ClauseName, Fixity);
#[derive(Debug, Clone)]
pub struct OpDirValue(pub SharedOpDesc, pub ClauseName);
impl OpDirValue {
pub fn new(spec: Specifier, priority: usize, module_name: ClauseName) -> Self {
OpDirValue(SharedOpDesc::new(priority, spec), module_name)
}
#[inline]
pub fn shared_op_desc(&self) -> SharedOpDesc {
self.0.clone()
}
#[inline]
pub fn owning_module(&self) -> ClauseName {
self.1.clone()
}
}
pub type OpDir = HashMap<OpDirKey, OpDirValue>;
#[derive(Debug, Clone, Copy)]
pub struct MachineFlags {
pub double_quotes: DoubleQuotes
}
impl Default for MachineFlags {
fn default() -> Self {
MachineFlags { double_quotes: DoubleQuotes::default() }
}
}
#[derive(Debug, Clone, Copy)]
pub enum DoubleQuotes {
Atom, Chars, Codes
}
impl DoubleQuotes {
pub fn is_chars(self) -> bool {
if let DoubleQuotes::Chars = self {
true
} else {
false
}
}
pub fn is_atom(self) -> bool {
if let DoubleQuotes::Atom = self {
true
} else {
false
}
}
pub fn is_codes(self) -> bool {
if let DoubleQuotes::Codes = self {
true
} else {
false
}
}
}
impl Default for DoubleQuotes {
fn default() -> Self {
DoubleQuotes::Chars
}
}
pub fn default_op_dir() -> OpDir {
let module_name = clause_name!("builtins");
let mut op_dir = OpDir::new();
op_dir.insert((clause_name!(":-"), Fixity::In), OpDirValue::new(XFX, 1200, module_name.clone()));
op_dir.insert((clause_name!(":-"), Fixity::Pre), OpDirValue::new(FX, 1200, module_name.clone()));
op_dir.insert((clause_name!("?-"), Fixity::Pre), OpDirValue::new(FX, 1200, module_name.clone()));
op_dir.insert((clause_name!(","), Fixity::In), OpDirValue::new(XFY, 1000, module_name.clone()));
op_dir
}
#[derive(Debug, Clone)]
pub enum ArithmeticError {
NonEvaluableFunctor(Constant, usize),
UninstantiatedVar
}
#[derive(Debug)]
pub enum ParserError {
Arithmetic(ArithmeticError),
BackQuotedString(usize, usize),
BadPendingByte,
CannotParseCyclicTerm,
UnexpectedChar(char, usize, usize),
UnexpectedEOF,
IO(IOError),
ExpectedRel,
ExpectedTopLevelTerm,
InadmissibleFact,
InadmissibleQueryTerm,
IncompleteReduction(usize, usize),
InconsistentEntry,
InvalidDoubleQuotesDecl,
InvalidHook,
InvalidModuleDecl,
InvalidModuleExport,
InvalidRuleHead,
InvalidUseModuleDecl,
InvalidModuleResolution,
InvalidSingleQuotedCharacter(char),
MissingQuote(usize, usize),
NonPrologChar(usize, usize),
ParseBigInt(usize, usize),
ParseFloat(usize, usize),
Utf8Error(usize, usize)
}
impl ParserError {
pub fn line_and_col_num(&self) -> Option<(usize, usize)> {
match self {
&ParserError::BackQuotedString(line_num, col_num)
| &ParserError::UnexpectedChar(_, line_num, col_num)
| &ParserError::IncompleteReduction(line_num, col_num)
| &ParserError::MissingQuote(line_num, col_num)
| &ParserError::NonPrologChar(line_num, col_num)
| &ParserError::ParseBigInt(line_num, col_num)
| &ParserError::ParseFloat(line_num, col_num)
| &ParserError::Utf8Error(line_num, col_num) =>
Some((line_num, col_num)),
_ =>
None
}
}
pub fn as_str(&self) -> &'static str {
match self {
&ParserError::Arithmetic(..) =>
"arithmetic_error",
&ParserError::BackQuotedString(..) =>
"back_quoted_string",
&ParserError::BadPendingByte =>
"bad_pending_byte",
&ParserError::UnexpectedChar(..) =>
"unexpected_char",
&ParserError::UnexpectedEOF =>
"unexpected_end_of_file",
&ParserError::ExpectedRel =>
"expected_relation",
&ParserError::ExpectedTopLevelTerm =>
"expected_atom_or_cons_or_clause",
&ParserError::InadmissibleFact =>
"inadmissible_fact",
&ParserError::InadmissibleQueryTerm =>
"inadmissible_query_term",
&ParserError::IncompleteReduction(..) =>
"incomplete_reduction",
&ParserError::InconsistentEntry =>
"inconsistent_entry",
&ParserError::InvalidDoubleQuotesDecl =>
"invalid_double_quotes_declaration",
&ParserError::InvalidHook =>
"invalid_hook",
&ParserError::InvalidModuleDecl =>
"invalid_module_declaration",
&ParserError::InvalidModuleExport =>
"invalid_module_export",
&ParserError::InvalidModuleResolution =>
"invalid_module_resolution",
&ParserError::InvalidRuleHead =>
"invalid_head_of_rule",
&ParserError::InvalidUseModuleDecl =>
"invalid_use_module_declaration",
&ParserError::InvalidSingleQuotedCharacter(..) =>
"invalid_single_quoted_character",
&ParserError::IO(_) =>
"input_output_error",
&ParserError::MissingQuote(..) =>
"missing_quote",
&ParserError::NonPrologChar(..) =>
"non_prolog_character",
&ParserError::ParseBigInt(..) =>
"cannot_parse_big_int",
&ParserError::ParseFloat(..) =>
"cannot_parse_float",
&ParserError::Utf8Error(..) =>
"utf8_conversion_error",
&ParserError::CannotParseCyclicTerm =>
"cannot_parse_cyclic_term"
}
}
}
impl From<ArithmeticError> for ParserError {
fn from(err: ArithmeticError) -> ParserError {
ParserError::Arithmetic(err)
}
}
impl From<IOError> for ParserError {
fn from(err: IOError) -> ParserError {
ParserError::IO(err)
}
}
impl From<&IOError> for ParserError {
fn from(error: &IOError) -> ParserError {
if error.get_ref().filter(|e| e.is::<BadUtf8Error>()).is_some() {
ParserError::Utf8Error(0, 0)
} else {
ParserError::IO(error.kind().into())
}
}
}
#[derive(Debug, Clone, Copy, Eq, Hash, PartialEq, PartialOrd, Ord)]
pub enum Fixity {
In, Post, Pre
}
#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord)]
pub struct SharedOpDesc(Rc<Cell<(usize, Specifier)>>);
impl SharedOpDesc {
#[inline]
pub fn new(priority: usize, spec: Specifier) -> Self {
SharedOpDesc(Rc::new(Cell::new((priority, spec))))
}
#[inline]
pub fn ptr_eq(lop_desc: &SharedOpDesc, rop_desc: &SharedOpDesc) -> bool {
Rc::ptr_eq(&lop_desc.0, &rop_desc.0)
}
#[inline]
pub fn arity(&self) -> usize {
if self.get().1 & (XFX | XFY | YFX) == 0 {
1
} else {
2
}
}
#[inline]
pub fn get(&self) -> (usize, Specifier) {
self.0.get()
}
#[inline]
pub fn set(&self, prec: usize, spec: Specifier) {
self.0.set((prec, spec));
}
#[inline]
pub fn prec(&self) -> usize {
self.0.get().0
}
#[inline]
pub fn assoc(&self) -> Specifier {
self.0.get().1
}
}
impl Hash for SharedOpDesc {
fn hash<H: Hasher>(&self, state: &mut H) {
0.hash(state)
}
}
#[derive(Debug, Clone, Hash)]
pub enum Constant {
Atom(ClauseName, Option<SharedOpDesc>),
Char(char),
EmptyList,
Fixnum(isize),
Integer(Rc<Integer>),
Rational(Rc<Rational>),
Float(OrderedFloat<f64>),
String(Rc<String>),
Usize(usize),
}
impl fmt::Display for Constant {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
&Constant::Atom(ref atom, _) =>
if atom.as_str().chars().any(|c| "`.$'\" ".contains(c)) {
write!(f, "'{}'", atom.as_str())
} else {
write!(f, "{}", atom.as_str())
},
&Constant::Char(c) =>
write!(f, "'{}'", c as u32),
&Constant::EmptyList =>
write!(f, "[]"),
&Constant::Fixnum(n) =>
write!(f, "{}", n),
&Constant::Integer(ref n) =>
write!(f, "{}", n),
&Constant::Rational(ref n) =>
write!(f, "{}", n),
&Constant::Float(ref n) =>
write!(f, "{}", n),
&Constant::String(ref s) =>
write!(f, "\"{}\"", &s),
&Constant::Usize(integer) =>
write!(f, "u{}", integer),
}
}
}
impl PartialEq for Constant {
fn eq(&self, other: &Constant) -> bool {
match (self, other) {
(&Constant::Atom(ref atom, _), &Constant::Char(c))
| (&Constant::Char(c), &Constant::Atom(ref atom, _)) => {
atom.is_char() && Some(c) == atom.as_str().chars().next()
},
(&Constant::Atom(ref a1, _), &Constant::Atom(ref a2, _)) =>
a1.as_str() == a2.as_str(),
(&Constant::Char(c1), &Constant::Char(c2)) =>
c1 == c2,
(&Constant::Fixnum(n1), &Constant::Fixnum(n2)) =>
n1 == n2,
(&Constant::Fixnum(n1), &Constant::Integer(ref n2)) |
(&Constant::Integer(ref n2), &Constant::Fixnum(n1)) => {
if let Some(n2) = n2.to_isize() {
n1 == n2
} else {
false
}
}
(&Constant::Integer(ref n1), &Constant::Integer(ref n2)) =>
n1 == n2,
(&Constant::Rational(ref n1), &Constant::Rational(ref n2)) =>
n1 == n2,
(&Constant::Float(ref n1), &Constant::Float(ref n2)) =>
n1 == n2,
(&Constant::String(ref s1), &Constant::String(ref s2)) => {
&s1 == &s2
}
(&Constant::EmptyList, &Constant::EmptyList) =>
true,
(&Constant::Usize(u1), &Constant::Usize(u2)) =>
u1 == u2,
_ => false
}
}
}
impl Eq for Constant {}
impl Constant {
pub fn to_atom(self) -> Option<ClauseName> {
match self {
Constant::Atom(a, _) => Some(a.defrock_brackets()),
_ => None
}
}
}
#[derive(Debug, Clone)]
pub enum ClauseName {
BuiltIn(&'static str),
User(TabledRc<Atom>)
}
impl fmt::Display for ClauseName {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}", self.as_str())
}
}
impl Hash for ClauseName {
fn hash<H: Hasher>(&self, state: &mut H) {
(*self.as_str()).hash(state)
}
}
impl PartialEq for ClauseName {
fn eq(&self, other: &ClauseName) -> bool {
*self.as_str() == *other.as_str()
}
}
impl Eq for ClauseName {}
impl Ord for ClauseName {
fn cmp(&self, other: &ClauseName) -> Ordering {
(*self.as_str()).cmp(other.as_str())
}
}
impl PartialOrd for ClauseName {
fn partial_cmp(&self, other: &ClauseName) -> Option<Ordering> {
Some(self.cmp(other))
}
}
impl<'a> From<&'a TabledRc<Atom>> for ClauseName {
fn from(name: &'a TabledRc<Atom>) -> ClauseName {
ClauseName::User(name.clone())
}
}
impl ClauseName {
#[inline]
pub fn owning_module(&self) -> Self {
match self {
&ClauseName::User(ref name) => {
let module = name.owning_module();
ClauseName::User(TabledRc { atom: module.clone(),
table: TabledData::new(module) })
},
_ => clause_name!("user")
}
}
#[inline]
pub fn to_rc(&self) -> Rc<String> {
match self {
&ClauseName::BuiltIn(s) => Rc::new(s.to_string()),
&ClauseName::User(ref rc) => rc.inner()
}
}
#[inline]
pub fn with_table(self, atom_tbl: TabledData<Atom>) -> Self {
match self {
ClauseName::BuiltIn(_) => self,
ClauseName::User(mut name) => {
name.table = atom_tbl;
ClauseName::User(name)
}
}
}
#[inline]
pub fn has_table(&self, atom_tbl: &TabledData<Atom>) -> bool {
match self {
ClauseName::BuiltIn(_) => false,
ClauseName::User(ref name) => &name.table == atom_tbl,
}
}
#[inline]
pub fn has_table_of(&self, other: &ClauseName) -> bool {
match self {
ClauseName::BuiltIn(_) => {
if let ClauseName::BuiltIn(_) = other {
true
} else {
false
}
}
ClauseName::User(ref name) => {
other.has_table(&name.table)
}
}
}
#[inline]
pub fn as_str(&self) -> &str {
match self {
&ClauseName::BuiltIn(s) => s,
&ClauseName::User(ref name) => name.as_ref()
}
}
#[inline]
pub fn is_char(&self) -> bool {
!self.as_str().is_empty() && self.as_str().chars().skip(1).next().is_none()
}
pub fn defrock_brackets(self) -> Self {
fn defrock_brackets(s: &str) -> &str {
if s.starts_with('(') && s.ends_with(')') {
&s[1 .. s.len() - 1]
} else {
s
}
}
match self {
ClauseName::BuiltIn(s) =>
ClauseName::BuiltIn(defrock_brackets(s)),
ClauseName::User(s) =>
ClauseName::User(tabled_rc!(defrock_brackets(s.as_str()).to_owned(), s.table))
}
}
}
impl AsRef<str> for ClauseName {
#[inline]
fn as_ref(self: &Self) -> &str {
self.as_str()
}
}
#[derive(Debug, PartialEq, Eq, Clone)]
pub enum Term {
AnonVar,
Clause(Cell<RegType>, ClauseName, Vec<Box<Term>>, Option<SharedOpDesc>),
Cons(Cell<RegType>, Box<Term>, Box<Term>),
Constant(Cell<RegType>, Constant),
Var(Cell<VarReg>, Rc<Var>)
}
impl Term {
pub fn shared_op_desc(&self) -> Option<SharedOpDesc> {
match self {
&Term::Clause(_, _, _, ref spec) => spec.clone(),
&Term::Constant(_, Constant::Atom(_, ref spec)) => spec.clone(),
_ => None
}
}
pub fn to_constant(self) -> Option<Constant> {
match self {
Term::Constant(_, c) => Some(c),
_ => None
}
}
pub fn first_arg(&self) -> Option<&Term> {
match self {
&Term::Clause(_, _, ref terms, _) =>
terms.first().map(|bt| bt.as_ref()),
_ => None
}
}
pub fn set_name(&mut self, new_name: ClauseName) {
match self {
Term::Constant(_, Constant::Atom(ref mut atom, _))
| Term::Clause(_, ref mut atom, ..) => {
*atom = new_name;
}
_ => {}
}
}
pub fn name(&self) -> Option<ClauseName> {
match self {
&Term::Constant(_, Constant::Atom(ref atom, _))
| &Term::Clause(_, ref atom, ..) => Some(atom.clone()),
_ => None
}
}
pub fn arity(&self) -> usize {
match self {
&Term::Clause(_, _, ref child_terms, ..) => child_terms.len(),
_ => 0
}
}
}
#[derive(Debug, Clone, Copy)]
pub struct CompositeOp<'a, 'b> {
pub op_dir: &'a OpDir,
pub static_op_dir: Option<&'b OpDir>
}
#[macro_export]
macro_rules! composite_op {
($include_machine_p:expr, $op_dir:expr, $machine_op_dir:expr) => (
CompositeOp { op_dir: $op_dir,
static_op_dir: if !$include_machine_p {
Some($machine_op_dir)
} else {
None
}}
);
($op_dir:expr) => (
CompositeOp { op_dir: $op_dir, static_op_dir: None }
)
}
impl<'a, 'b> CompositeOp<'a, 'b>
{
#[inline]
pub(crate)
fn get(&self, name: ClauseName, fixity: Fixity) -> Option<OpDirValue>
{
let entry =
if let Some(ref static_op_dir) = &self.static_op_dir {
static_op_dir.get(&(name.clone(), fixity))
} else {
None
};
entry.or_else(move || self.op_dir.get(&(name, fixity)))
.cloned()
}
}
fn unfold_by_str_once(term: &mut Term, s: &str) -> Option<(Term, Term)> {
if let &mut Term::Clause(_, ref name, ref mut subterms, _) = term {
if name.as_str() == s && subterms.len() == 2 {
let snd = *subterms.pop().unwrap();
let fst = *subterms.pop().unwrap();
return Some((fst, snd));
}
}
None
}
pub fn unfold_by_str(mut term: Term, s: &str) -> Vec<Term> {
let mut terms = vec![];
while let Some((fst, snd)) = unfold_by_str_once(&mut term, s) {
terms.push(fst);
term = snd;
}
terms.push(term);
terms
}
pub type ParsingStream<R> = PutBackN<CodePoints<Bytes<R>>>;
use unicode_reader::BadUtf8Error;
#[inline]
pub fn parsing_stream<R: Read>(src: R) -> Result<ParsingStream<R>, ParserError> {
let mut stream = put_back_n(CodePoints::from(src.bytes()));
match stream.peek() {
None => Ok(stream),
Some(Err(error)) => Err(ParserError::from(error)),
Some(Ok(c)) => {
if *c == '\u{feff}' {
stream.next();
}
Ok(stream)
}
}
}