public void Visit(Statement expression)
{
if (expression != null)
{
expression.Accept(this);
}
}
public void Interprete(Function func, params object[] args)
{
int j = 0;
if (func.ThisVariable != null)
{
DeclareArgument(func.ThisVariable, args[0]);
j = 1;
}
for (int i = 0; i < func.InputVariables.Count; i++)
{
DeclareArgument(func.InputVariables[i], args[j]);
j++;
}
func.Body.Accept(this);
while (_execLeaf != null)
{
Statement next = _execLeaf.Successor;
if (next != null)
{
next.Accept(this);
}
else
{
break;
}
}
}
public static Statement Forify(this Statement stmt)
{
Forifier forifier = new Forifier();
stmt.Accept(forifier);
return(forifier.Result);
}
public override void Visit(GroupClause expression)
{
Dictionary<object, NLinqGroup> groups = new Dictionary<object, NLinqGroup>();
for(int i=0; i<tuples.Count; i++)
{
currentTuple = tuples[i];
expression.Expression.Accept(this);
object key = result;
if (!groups.ContainsKey(key))
{
groups.Add(key, new NLinqGroup(key));
}
Statement s = new Statement(new Expression[] { expression.Identifier });
s.Accept(this);
groups[key].Group.Add(result);
}
tuples.Clear();
foreach (NLinqGroup g in groups.Values)
{
List<object> row = new List<object>();
row.Add(g);
tuples.Add(row);
}
}
/// <summary>
/// Extracts all atomic statements inside a given statement.
/// </summary>
/// <param name="stmt"></param>
/// <returns>The list of atomic statements, the first entry being the entry.</returns>
public static List <Statement> GetAtomicStatements(this Statement stmt)
{
AtomicStatementExtractor ase = new AtomicStatementExtractor();
stmt.Accept(ase);
return(ase.Result);
}
/// <summary>
/// Determines whether a given statement is empty, that is if it does not perform any operation.
/// </summary>
/// <param name="stmt">>A statement</param>
/// <returns>true if the statement is empty, false if not</returns>
public static bool IsEmpty(this Statement stmt)
{
EmptyStatementDetector esd = new EmptyStatementDetector();
stmt.Accept(esd);
return(esd.IsEmpty);
}
/// <summary>
/// Extracts the first innermost atomic statement inside a given statement.
/// </summary>
/// <param name="stmt"></param>
/// <returns></returns>
public static Statement GetInnermostAtomicStatement(this Statement stmt)
{
InnermostAtomicStatementExtractor ase = new InnermostAtomicStatementExtractor();
stmt.Accept(ase);
return(ase.Result);
}
public static Statement AsSingleStatement(this Statement stmt)
{
SingleStatementGetter ssg = new SingleStatementGetter();
stmt.Accept(ssg);
return(ssg.Result);
}
public static IList <Statement> AsStatementList(this Statement stmt)
{
StatementListGetter slg = new StatementListGetter();
stmt.Accept(slg);
return(slg.Result);
}
public static bool NeedsLoopScope(this Statement stmt, LoopBlock loop)
{
LoopControlDetector lcd = new LoopControlDetector(loop);
stmt.Accept(lcd);
return(lcd.Result);
}
/// <summary>
/// Tries to interpret the statement as "while" loop.
/// </summary>
/// <param name="stmt">assumed "while" loop</param>
/// <returns>an explicit SysDOM representation of the "while" loop, or <c>null</c> if the statement
/// does not match the expected pattern</returns>
public static LoopBlock AsWhileLoop(this Statement stmt)
{
WhileLoopRecognizer wlr = new WhileLoopRecognizer();
stmt.Accept(wlr);
return(wlr.Result);
}
public void Xlat(Statement stmt)
{
if (stmt != null)
{
stmt.Accept(this);
}
}
/// <summary>
/// Returns <c>true</c> if the given statement modifies the given variable.
/// </summary>
/// <remarks>
/// The current implementation is not capable of detecting modifications of variables which are referenced as "out" arguments of some method.
/// </remarks>
/// <param name="stmt">statement</param>
/// <param name="variable">variable</param>
public static bool Modifies(this Statement stmt, IStorable variable)
{
VariableModificationDetector vmd = new VariableModificationDetector(variable);
stmt.Accept(vmd);
return(vmd.Result);
}
/// <summary>
/// Returns the set of direct successors of a statement.
/// </summary>
/// <remarks>
/// This operation is only valid on atomic statements, that is all statement types except <c>CompoundStatement</c> and
/// <c>LoopBlock</c>.
/// Furthermore, only atomic statements constitute the result enumeration.
/// </remarks>
/// <param name="stmt">statement whose program flow successors shall be retrieved</param>
/// <returns>an enumeration of all possible program flow successors</returns>
public static IEnumerable <Statement> GetProgramflowSucessors(Statement stmt)
{
ProgramflowSuccessorsGetter psg = new ProgramflowSuccessorsGetter();
stmt.Accept(psg);
return(psg.Result);
}
public static void RemoveAll(this Statement stmt, Statement toRemove)
{
StatementRemover sr = new StatementRemover()
{
Match = toRemove
};
stmt.Accept(sr);
}
/// <summary>
/// Tries to interpret the statement as "for" loop.
/// </summary>
/// <param name="stmt">assumed "for" loop</param>
/// <param name="level">pattern matching restrictions</param>
/// <returns>an explicit SysDOM representation of the "for" loop, or <c>null</c> if the statement
/// does not match the expected pattern</returns>
public static LoopBlock AsForLoop(this Statement stmt, EForLoopLevel level)
{
ForLoopRecognizer flr = new ForLoopRecognizer()
{
Level = level
};
stmt.Accept(flr);
return(flr.Result);
}
/// <summary>
/// Determines whether a given statement is an ancestor of some other statement.
/// </summary>
/// <param name="stmt">An assumed ancestor</param>
/// <param name="grandChild">Its assumed granchild</param>
/// <returns><c>true</c> if <paramref name="stmt"/> is an ancestor of <paramref name="grandChild"/></returns>
/// <remarks>A statement a is an ancestor of a statement b iff there exists a sequence
/// s1, s2,... , sN of zero or more statements such that a contains s1, s1 contains s2,
/// ... and sN contains b. Furthermore, each statement is per definition an ancestor
/// of itself.
/// </remarks>
public static bool IsAncestor(this Statement stmt, Statement grandChild)
{
HierarchyAnalyzer ha = new HierarchyAnalyzer()
{
Grandchild = grandChild
};
stmt.Accept(ha);
return(ha.IsAncestor);
}
public T42Program Generate(Statement stmt)
{
var globalEnvironment = new FunctionGeneratorEnvironment();
Program.Emit(T42Instruction.DECL(1));
Program.Emit(T42Instruction.BSR("main"));
Program.Emit(T42Instruction.END);
stmt.Accept(this, globalEnvironment);
Program.Link();
return(Program);
}
public TResult Visit(Statement statement, TEnvironment environment)
{
statement.Accept(this, environment);
return(default(TResult));
}
public virtual JsInstance Execute(IJintVisitor visitor, JsDictionaryObject that, JsInstance[] parameters)
{
Statement.Accept((IStatementVisitor)visitor);
return(that);
}
public void Execute(Statement statement)
{
Reset();
statement.Accept(this);
}
public void Visit(Statement expression)
{
if (expression != null)
expression.Accept(this);
}
protected override void DeclareAlgorithm()
{
_root.Accept(this);
}
private ByteCodeChunk VisitStatement(Statement statement) => statement.Accept(this);
/// <summary>
/// Returns the set of direct successors of a statement.
/// </summary>
/// <remarks>
/// This operation is only valid on atomic statements, that is all statement types except <c>CompoundStatement</c> and
/// <c>LoopBlock</c>.
/// Furthermore, only atomic statements constitute the result enumeration.
/// </remarks>
/// <param name="stmt">statement whose program flow successors shall be retrieved</param>
/// <returns>an enumeration of all possible program flow successors</returns>
public static IEnumerable<Statement> GetProgramflowSucessors(Statement stmt)
{
ProgramflowSuccessorsGetter psg = new ProgramflowSuccessorsGetter();
stmt.Accept(psg);
return psg.Result;
}
public void AcceptLoopBlock(LoopBlock stmt)
{
IfStatement cond = stmt.Body.AsSingleStatement() as IfStatement;
if (cond == null)
{
return;
}
if (cond.Conditions.Count != 1 ||
cond.Branches.Count != 2)
{
return;
}
IList <Statement> trueBranch = cond.Branches[0].AsStatementList();
if (trueBranch.Count == 0 ||
!trueBranch.Last().Equals(new ContinueLoopStatement()
{
Loop = stmt
}))
{
return;
}
IList <Statement> falseBranch = cond.Branches[1].AsStatementList();
if (falseBranch.Count == 0)
{
return;
}
#if false
BreakLoopStatement breaker = new BreakLoopStatement()
{
Loop = stmt
};
Statement trailer = cond.Branches[1].Clone;
trailer.RemoveAll(breaker);
#endif
Statement trailer = cond.Branches[1].Clone;
BreakLoopReplacer blr = new BreakLoopReplacer(stmt);
trailer.Accept(blr);
if (trailer.NeedsLoopScope(stmt))
{
return;
}
#if false
CompoundStatement trailer = new CompoundStatement();
trailer.Statements.AddRange(falseBranch.Take(falseBranch.Count - 1));
if (trailer.NeedsLoopScope(stmt))
{
return;
}
BreakLoopStatement breaker = falseBranch.Last() as BreakLoopStatement;
if (breaker == null)
{
return;
}
if (breaker.Loop.IsAncestor(stmt))
{
/* Consider the following situation:
*
* L1: loop
* some outer loop work
* L2: loop
* if someCondition then
* do something
* continue L2
* else
* do something different
* break L1
* end if
* end loop L2
* end loop L1
*
* As the inner break statement breaks the outer loop, this loop
* must be transformed into the following code:
*
* L1: loop
* some outer loop work
* while someCondition loop
* do something
* end while
* do something different
* break L1
* end loop
* */
if (breaker.Loop != stmt)
{
trailer.Statements.Add(breaker);
}
}
else
{
return;
}
#endif
CompoundStatement newBody = new CompoundStatement();
newBody.Statements.AddRange(trueBranch.Take(trueBranch.Count - 1));
LoopBlock whileBlock = (LoopBlock)stmt.Clone;
whileBlock.HeadCondition = cond.Conditions[0];
whileBlock.Body = newBody;
whileBlock.Trailer = trailer;
Result = whileBlock;
}
/// <summary>
/// Execute a statement
/// </summary>
/// <param name="statement">Statement to execute</param>
public void Execute(Statement statement)
{
statement.Accept(this);
}
public static void PreprocessForLoopKindRecognition(this Statement stmt)
{
Preprocessor prep = new Preprocessor();
stmt.Accept(prep);
}
private void Execute(Statement statement)
{
statement.Accept(this);
}
public VoidValueType Visit(Statement statement, ITypeEnvironment environment)
{
statement.Accept(this, environment);
return(new VoidValueType());
}
private void Resolve(Statement statement)
{
statement?.Accept(this);
}
public void VisitStatement(Statement statement)
{
// 遍历语句内容。
statement.Accept(this);
ReturnValue = null;
}
public Widget Visit(Statement statement, GuiEnvironment environment)
{
return(statement.Accept(this, environment));
}
public void Xlat(Statement stmt)
{
if (stmt != null)
{
stmt.Accept(this);
}
}
public string Print(Statement statement)
{
return(statement.Accept(this));
}