public override DynValue Visit(WhileLoopNode whileLoopNode)
{
try
{
LoopStack.Push(new LoopStackItem());
while (Visit(whileLoopNode.Expression).Number != 0)
{
ExecuteStatementList(whileLoopNode.StatementList).GetAwaiter().GetResult();
var stackTop = LoopStack.Peek();
if (stackTop.BreakLoop)
{
break;
}
if (stackTop.SkipThisIteration)
{
stackTop.SkipThisIteration = false;
continue;
}
}
}
catch
{
throw;
}
finally
{
LoopStack.Pop();
}
return(DynValue.Zero);
}
//IStatement
public void Execute()
{
if (control == "break")
{
LoopStack.Pop();
}
else if (control == "continue")
{
LoopStack.Push();
}
else
{
throw new Exception("Unknown control");
}
}
IEnumerable <Snippet> GetSnippets(IndexReader stringReader, string path)
{
var language = GetLanguageFromPath(path);
var loopStack = new LoopStack();
while (true)
{
var line = stringReader.ReadLine();
if (line == null)
{
if (loopStack.IsInSnippet)
{
var current = loopStack.Current;
yield return(Snippet.BuildError(
error: "Snippet was not closed",
path: path,
lineNumberInError: current.StartLine + 1,
key: current.Key));
}
break;
}
var trimmedLine = line.Trim()
.Replace(" ", " ")
.ToLowerInvariant();
string version;
Func <string, bool> endFunc;
string key;
if (StartEndTester.IsStart(trimmedLine, out version, out key, out endFunc))
{
loopStack.Push(endFunc, key, version, stringReader.Index);
continue;
}
if (loopStack.IsInSnippet)
{
if (!loopStack.Current.EndFunc(trimmedLine))
{
loopStack.AppendLine(line);
continue;
}
yield return(BuildSnippet(stringReader, path, loopStack.Current, language));
loopStack.Pop();
}
}
}
public void Execute()
{
if (loop)
{
id = LoopStack.Id();
}
foreach (var item in block)
{
item.Execute();
if (loop && id < LoopStack.Id())
{
LoopStack.Pop();
break;
}
}
}
static IEnumerable <Snippet> GetSnippets(TextReader stringReader, string path, int maxWidth)
{
var language = GetLanguageFromPath(path);
var loopStack = new LoopStack();
var index = 0;
while (true)
{
index++;
var line = stringReader.ReadLine();
if (line == null)
{
if (loopStack.IsInSnippet)
{
var current = loopStack.Current;
yield return(Snippet.BuildError(
error: "Snippet was not closed",
path: path,
lineNumberInError: current.StartLine + 1,
key: current.Key));
}
break;
}
var trimmedLine = line.Trim();
if (StartEndTester.IsStart(trimmedLine, path, out var key, out var endFunc))
{
loopStack.Push(endFunc, key, index, maxWidth);
continue;
}
if (!loopStack.IsInSnippet)
{
continue;
}
if (!loopStack.Current.EndFunc(trimmedLine))
{
Snippet?error = null;
try
{
loopStack.AppendLine(line);
}
catch (LineTooLongException exception)
{
var current = loopStack.Current;
error = Snippet.BuildError(
error: "Line too long: " + exception.Line,
path: path,
lineNumberInError: current.StartLine + 1,
key: current.Key);
}
if (error != null)
{
yield return(error);
break;
}
continue;
}
yield return(BuildSnippet(path, loopStack, language, index));
loopStack.Pop();
}
}
public override DynValue Visit(ForLoopNode forLoopNode)
{
_ = Visit(forLoopNode.Assignment).Number;
DynValue step = new DynValue(1);
var targetValue = Visit(forLoopNode.TargetValue);
if (forLoopNode.Step != null)
{
step = Visit(forLoopNode.Step);
}
var isLocalScope = false;
var assignmentNode = (forLoopNode.Assignment as AssignmentNode);
var iteratorName = assignmentNode.Variable.Name;
if (assignmentNode.LocalScope)
{
isLocalScope = true;
}
try
{
LoopStack.Push(new LoopStackItem());
while (true)
{
ExecuteStatementList(forLoopNode.StatementList).GetAwaiter().GetResult();
double iterator;
if (isLocalScope)
{
var callStackTop = CallStack.Peek();
iterator = callStackTop.LocalVariableScope[iteratorName].Number;
}
else
{
iterator = Environment.Globals[iteratorName].Number;
}
if (step.Number < 0)
{
if (iterator < targetValue.Number)
{
break;
}
else
{
iterator -= step.Number;
}
}
else
{
if (iterator >= targetValue.Number)
{
break;
}
else
{
iterator += step.Number;
}
}
if (isLocalScope)
{
// no throw on localvar token, so
// guaranteed we're inside a function
var callStackTop = CallStack.Peek();
callStackTop.LocalVariableScope[iteratorName] = new DynValue(iterator);
}
else
{
Environment.Globals[iteratorName] = new DynValue(iterator);
}
var loopStackTop = LoopStack.Peek();
if (loopStackTop.BreakLoop)
{
break;
}
if (loopStackTop.SkipThisIteration)
{
loopStackTop.SkipThisIteration = false;
continue;
}
}
}
catch
{
throw;
}
finally
{
LoopStack.Pop();
}
return(DynValue.Zero);
}
public override DynValue Visit(EachLoopNode eachLoopNode)
{
var keyName = eachLoopNode.KeyNode.Name;
var valueName = eachLoopNode.ValueNode.Name;
DynValue backupKeyVar = null;
DynValue backupValueVar = null;
try
{
var lsItem = new LoopStackItem();
LoopStack.Push(lsItem);
DynValue tableValue = null;
if (eachLoopNode.TableNode is VariableNode varNode)
{
var tableName = varNode.Name;
if (CallStack.Count > 0)
{
var csItem = CallStack.Peek();
if (csItem.LocalVariableScope.ContainsKey(tableName))
{
tableValue = csItem.LocalVariableScope[tableName];
}
else if (csItem.ParameterScope.ContainsKey(tableName))
{
tableValue = csItem.ParameterScope[tableName];
}
}
if (tableValue == null)
{
if (Environment.SupplementLocalLookupTable.ContainsKey(tableName))
{
tableValue = Environment.SupplementLocalLookupTable[tableName];
}
else if (Environment.Globals.ContainsKey(tableName))
{
tableValue = Environment.Globals[tableName];
}
else
{
throw new RuntimeException($"Variable '{tableName}' could not be found in any known scope.", eachLoopNode.TableNode.Line);
}
}
}
else if (eachLoopNode.TableNode is FunctionCallNode fnCallNode)
{
tableValue = Visit(fnCallNode);
}
else
{
throw new RuntimeException("Expected a variable or function call.", eachLoopNode.TableNode.Line);
}
if (tableValue.Type != DynValueType.Table)
{
throw new RuntimeException($"Expected a table, got {tableValue.Type.ToString().ToLower()}.", eachLoopNode.TableNode.Line);
}
var actualTable = tableValue.Table;
if (Environment.Globals.ContainsKey(keyName))
{
backupKeyVar = Environment.Globals[keyName];
}
if (Environment.Globals.ContainsKey(valueName))
{
backupValueVar = Environment.Globals[valueName];
}
try
{
foreach (var element in actualTable)
{
if (Environment.Globals.ContainsKey(keyName))
{
Environment.Globals.Remove(keyName);
}
if (Environment.Globals.ContainsKey(valueName))
{
Environment.Globals.Remove(valueName);
}
Environment.Globals.Add(keyName, element.Key);
Environment.Globals.Add(valueName, element.Value);
ExecuteStatementList(eachLoopNode.StatementList).GetAwaiter().GetResult();
}
}
catch (InvalidOperationException)
{
throw new RuntimeException("The table was modified, cannot continue execution.", eachLoopNode.Line);
}
finally
{
Environment.Globals.Remove(keyName);
Environment.Globals.Remove(valueName);
}
}
catch
{
throw;
}
finally
{
if (backupKeyVar != null)
{
Environment.Globals.Add(keyName, backupKeyVar);
}
if (backupValueVar != null)
{
Environment.Globals.Add(valueName, backupValueVar);
}
LoopStack.Pop();
}
return(DynValue.Zero);
}
