make use of read_term in the repl
This commit is contained in:
Mark Thom
349
src/prolog/write.rs
Normal file
349
src/prolog/write.rs
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@@ -0,0 +1,349 @@
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use prolog::instructions::*;
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use prolog::heap_print::*;
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use prolog::machine::*;
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use termion::raw::IntoRawMode;
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use termion::input::TermRead;
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use termion::event::Key;
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use std::io::{Write, stdin, stdout};
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use std::fmt;
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fn error_string(e: &String) -> String {
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format!("error: exception thrown: {}", e)
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}
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impl fmt::Display for IndexPtr {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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match self {
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&IndexPtr::Module =>
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write!(f, ""),
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&IndexPtr::Undefined =>
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write!(f, "undefined"),
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&IndexPtr::Index(i) =>
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write!(f, "{}", i)
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}
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}
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}
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impl fmt::Display for FactInstruction {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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match self {
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&FactInstruction::GetConstant(lvl, ref constant, ref r) =>
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write!(f, "get_constant {}, {}{}", constant, lvl, r.reg_num()),
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&FactInstruction::GetList(lvl, ref r) =>
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write!(f, "get_list {}{}", lvl, r.reg_num()),
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&FactInstruction::GetStructure(ref ct, ref arity, ref r) =>
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write!(f, "get_structure {}/{}, {}", ct.name(), arity, r),
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&FactInstruction::GetValue(ref x, ref a) =>
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write!(f, "get_value {}, A{}", x, a),
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&FactInstruction::GetVariable(ref x, ref a) =>
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write!(f, "fact:get_variable {}, A{}", x, a),
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&FactInstruction::UnifyConstant(ref constant) =>
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write!(f, "unify_constant {}", constant),
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&FactInstruction::UnifyVariable(ref r) =>
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write!(f, "unify_variable {}", r),
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&FactInstruction::UnifyLocalValue(ref r) =>
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write!(f, "unify_local_value {}", r),
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&FactInstruction::UnifyValue(ref r) =>
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write!(f, "unify_value {}", r),
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&FactInstruction::UnifyVoid(n) =>
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write!(f, "unify_void {}", n)
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}
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}
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}
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impl fmt::Display for QueryInstruction {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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match self {
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&QueryInstruction::GetVariable(ref x, ref a) =>
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write!(f, "query:get_variable {}, A{}", x, a),
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&QueryInstruction::PutConstant(lvl, ref constant, ref r) =>
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write!(f, "put_constant {}, {}{}", constant, lvl, r.reg_num()),
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&QueryInstruction::PutList(lvl, ref r) =>
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write!(f, "put_list {}{}", lvl, r.reg_num()),
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&QueryInstruction::PutStructure(ref ct, ref arity, ref r) =>
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write!(f, "put_structure {}/{}, {}", ct.name(), arity, r),
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&QueryInstruction::PutUnsafeValue(y, a) =>
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write!(f, "put_unsafe_value Y{}, A{}", y, a),
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&QueryInstruction::PutValue(ref x, ref a) =>
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write!(f, "put_value {}, A{}", x, a),
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&QueryInstruction::PutVariable(ref x, ref a) =>
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write!(f, "put_variable {}, A{}", x, a),
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&QueryInstruction::SetConstant(ref constant) =>
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write!(f, "set_constant {}", constant),
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&QueryInstruction::SetLocalValue(ref r) =>
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write!(f, "set_local_value {}", r),
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&QueryInstruction::SetVariable(ref r) =>
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write!(f, "set_variable {}", r),
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&QueryInstruction::SetValue(ref r) =>
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write!(f, "set_value {}", r),
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&QueryInstruction::SetVoid(n) =>
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write!(f, "set_void {}", n)
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}
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}
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}
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impl fmt::Display for CompareNumberQT {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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match self {
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&CompareNumberQT::GreaterThan => write!(f, ">"),
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&CompareNumberQT::GreaterThanOrEqual => write!(f, ">="),
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&CompareNumberQT::LessThan => write!(f, "<"),
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&CompareNumberQT::LessThanOrEqual => write!(f, "<="),
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&CompareNumberQT::NotEqual => write!(f, "=\\="),
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&CompareNumberQT::Equal => write!(f, "=:="),
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}
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}
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}
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impl fmt::Display for CompareTermQT {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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match self {
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&CompareTermQT::GreaterThan => write!(f, "@>"),
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&CompareTermQT::GreaterThanOrEqual => write!(f, "@>="),
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&CompareTermQT::LessThan => write!(f, "@<"),
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&CompareTermQT::LessThanOrEqual => write!(f, "@<="),
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&CompareTermQT::NotEqual => write!(f, "\\=@="),
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&CompareTermQT::Equal => write!(f, "=@="),
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}
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}
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}
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impl fmt::Display for ClauseType {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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match self {
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&ClauseType::Named(ref name, ref idx) | &ClauseType::Op(ref name, _, ref idx) => {
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let idx = idx.0.borrow();
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write!(f, "{}:{}/{}", idx.1, name, idx.0)
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},
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ref ct => write!(f, "{}", ct.name())
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}
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}
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}
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impl fmt::Display for ControlInstruction {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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match self {
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&ControlInstruction::Allocate(num_cells) =>
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write!(f, "allocate {}", num_cells),
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&ControlInstruction::CallClause(ref ct, arity, pvs, true, true) =>
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write!(f, "call_with_default_policy {}/{}, {}", ct, arity, pvs),
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&ControlInstruction::CallClause(ref ct, arity, pvs, false, true) =>
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write!(f, "execute_with_default_policy {}/{}, {}", ct, arity, pvs),
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&ControlInstruction::CallClause(ref ct, arity, pvs, true, false) =>
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write!(f, "execute {}/{}, {}", ct, arity, pvs),
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&ControlInstruction::CallClause(ref ct, arity, pvs, false, false) =>
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write!(f, "call {}/{}, {}", ct, arity, pvs),
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&ControlInstruction::Deallocate =>
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write!(f, "deallocate"),
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&ControlInstruction::JmpBy(arity, offset, pvs, false) =>
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write!(f, "jmp_by_call {}/{}, {}", offset, arity, pvs),
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&ControlInstruction::JmpBy(arity, offset, pvs, true) =>
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write!(f, "jmp_by_execute {}/{}, {}", offset, arity, pvs),
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&ControlInstruction::Proceed =>
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write!(f, "proceed"),
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}
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}
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}
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impl fmt::Display for IndexedChoiceInstruction {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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match self {
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&IndexedChoiceInstruction::Try(offset) =>
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write!(f, "try {}", offset),
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&IndexedChoiceInstruction::Retry(offset) =>
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write!(f, "retry {}", offset),
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&IndexedChoiceInstruction::Trust(offset) =>
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write!(f, "trust {}", offset)
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}
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}
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}
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impl fmt::Display for ChoiceInstruction {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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match self {
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&ChoiceInstruction::TryMeElse(offset) =>
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write!(f, "try_me_else {}", offset),
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&ChoiceInstruction::DefaultRetryMeElse(offset) =>
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write!(f, "retry_me_else_by_default {}", offset),
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&ChoiceInstruction::RetryMeElse(offset) =>
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write!(f, "retry_me_else {}", offset),
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&ChoiceInstruction::DefaultTrustMe =>
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write!(f, "trust_me_by_default"),
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&ChoiceInstruction::TrustMe =>
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write!(f, "trust_me")
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}
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}
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}
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impl fmt::Display for IndexingInstruction {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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match self {
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&IndexingInstruction::SwitchOnTerm(v, c, l, s) =>
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write!(f, "switch_on_term {}, {}, {}, {}", v, c, l, s),
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&IndexingInstruction::SwitchOnConstant(num_cs, _) =>
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write!(f, "switch_on_constant {}", num_cs),
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&IndexingInstruction::SwitchOnStructure(num_ss, _) =>
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write!(f, "switch_on_structure {}", num_ss)
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}
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}
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}
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impl fmt::Display for SessionError {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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match self {
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&SessionError::ModuleNotFound => write!(f, "module not found."),
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&SessionError::ModuleDoesNotContainExport => write!(f, "module does not contain claimed export."),
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&SessionError::QueryFailure => write!(f, "false."),
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&SessionError::QueryFailureWithException(ref e) => write!(f, "{}", error_string(e)),
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&SessionError::ImpermissibleEntry(ref msg) => write!(f, "cannot overwrite {}.", msg),
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&SessionError::OpIsInfixAndPostFix =>
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write!(f, "cannot define an op to be both postfix and infix."),
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&SessionError::NamelessEntry => write!(f, "the predicate head is not an atom or clause."),
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&SessionError::ParserError(ref e) => write!(f, "syntax_error({})", e.as_str()),
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}
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}
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}
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impl fmt::Display for ArithmeticTerm {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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match self {
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&ArithmeticTerm::Reg(r) => write!(f, "{}", r),
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&ArithmeticTerm::Interm(i) => write!(f, "@{}", i),
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&ArithmeticTerm::Number(ref n) => write!(f, "{}", n),
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}
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}
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}
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impl fmt::Display for ArithmeticInstruction {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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match self {
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&ArithmeticInstruction::Abs(ref a1, ref t) =>
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write!(f, "abs {}, @{}", a1, t),
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&ArithmeticInstruction::Add(ref a1, ref a2, ref t) =>
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write!(f, "add {}, {}, @{}", a1, a2, t),
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&ArithmeticInstruction::Sub(ref a1, ref a2, ref t) =>
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write!(f, "sub {}, {}, @{}", a1, a2, t),
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&ArithmeticInstruction::Mul(ref a1, ref a2, ref t) =>
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write!(f, "mul {}, {}, @{}", a1, a2, t),
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&ArithmeticInstruction::Pow(ref a1, ref a2, ref t) =>
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write!(f, "pow {}, {}, @{}", a1, a2, t),
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&ArithmeticInstruction::Div(ref a1, ref a2, ref t) =>
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write!(f, "div {}, {}, @{}", a1, a2, t),
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&ArithmeticInstruction::IDiv(ref a1, ref a2, ref t) =>
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write!(f, "idiv {}, {}, @{}", a1, a2, t),
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&ArithmeticInstruction::FIDiv(ref a1, ref a2, ref t) =>
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write!(f, "floored_idiv {}, {}, @{}", a1, a2, t),
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&ArithmeticInstruction::RDiv(ref a1, ref a2, ref t) =>
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write!(f, "rdiv {}, {}, @{}", a1, a2, t),
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&ArithmeticInstruction::Shl(ref a1, ref a2, ref t) =>
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write!(f, "shl {}, {}, @{}", a1, a2, t),
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&ArithmeticInstruction::Shr(ref a1, ref a2, ref t) =>
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write!(f, "shr {}, {}, @{}", a1, a2, t),
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&ArithmeticInstruction::Xor(ref a1, ref a2, ref t) =>
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write!(f, "xor {}, {}, @{}", a1, a2, t),
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&ArithmeticInstruction::And(ref a1, ref a2, ref t) =>
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write!(f, "and {}, {}, @{}", a1, a2, t),
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&ArithmeticInstruction::Or(ref a1, ref a2, ref t) =>
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write!(f, "or {}, {}, @{}", a1, a2, t),
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&ArithmeticInstruction::Mod(ref a1, ref a2, ref t) =>
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write!(f, "mod {}, {}, @{}", a1, a2, t),
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&ArithmeticInstruction::Rem(ref a1, ref a2, ref t) =>
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write!(f, "rem {}, {}, @{}", a1, a2, t),
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&ArithmeticInstruction::Neg(ref a, ref t) =>
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write!(f, "neg {}, @{}", a, t)
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}
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}
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}
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impl fmt::Display for CutInstruction {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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match self {
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&CutInstruction::Cut(r) =>
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write!(f, "cut {}", r),
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&CutInstruction::NeckCut =>
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write!(f, "neck_cut"),
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&CutInstruction::GetLevel(r) =>
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write!(f, "get_level {}", r),
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&CutInstruction::GetLevelAndUnify(r) =>
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write!(f, "get_level_and_unify {}", r)
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}
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}
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}
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impl fmt::Display for Level {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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match self {
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&Level::Root | &Level::Shallow => write!(f, "A"),
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&Level::Deep => write!(f, "X")
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}
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}
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}
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pub fn print(wam: &mut Machine, result: EvalSession) {
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match result {
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EvalSession::InitialQuerySuccess(alloc_locs, mut heap_locs) => {
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if heap_locs.is_empty() {
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println!("true.");
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return;
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}
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if !wam.or_stack_is_empty() {
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println!("true .");
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}
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loop {
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let mut result = EvalSession::from(SessionError::QueryFailure);
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let mut output = PrinterOutputter::new();
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let bindings = wam.heap_view(&heap_locs, output).result();
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let stdin = stdin();
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let mut stdout = stdout().into_raw_mode().unwrap();
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write!(stdout, "{}", bindings).unwrap();
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stdout.flush().unwrap();
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if !wam.or_stack_is_empty() {
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stdout.flush().unwrap();
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for c in stdin.keys() {
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match c.unwrap() {
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Key::Char(' ') | Key::Char(';') => {
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write!(stdout, " ;\n\r").unwrap();
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result = wam.continue_query(&alloc_locs, &mut heap_locs);
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break;
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},
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Key::Char('.') => {
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write!(stdout, " .\n\r").unwrap();
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return;
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},
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_ => {}
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}
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}
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if let &EvalSession::Error(SessionError::QueryFailure) = &result
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{
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write!(stdout, "false.\n\r").unwrap();
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stdout.flush().unwrap();
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return;
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}
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if let &EvalSession::Error(SessionError::QueryFailureWithException(ref e)) = &result
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{
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write!(stdout, "{}\n\r", error_string(e)).unwrap();
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stdout.flush().unwrap();
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return;
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}
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} else {
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break;
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}
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}
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write!(stdout(), ".\n").unwrap();
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},
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EvalSession::Error(e) => println!("{}", e),
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_ => {}
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};
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}
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Block a user