public void SetParent(TreeElement parent, int index = -1)
{
if (m_parent != null)
{
if (index == -1)
{
index = m_parent.m_children.IndexOf(this);
}
m_parent.SetChild(m_parent.m_children.IndexOf(this), null);
}
m_parent = parent;
if (m_parent == null)
{
return;
}
if (m_parent.ChildIndex(this) == -1)
{
m_parent.SetChild(index, this);
}
}
public void AddChild(TreeElement child)
{
SetChild(m_children.Count, child);
}
public int ChildIndex(TreeElement child)
{
return(m_children.IndexOf(child));
}
/// <summary>
/// Builds variable declaration element (with optional initialization)
/// </summary>
/// <param name="lexemes">List of lexemes</param>
/// <param name="pos">Position of current parsed lexeme</param>
/// <param name="elem">Element builded on lexemes</param>
/// <returns>Position of a next lexeme</returns>
private int ParseVarDeclaration(List <Lexeme> lexemes, int pos, out TreeElement elem)
{
var multipleDecl = new MultipleVarDeclarationElement();
var varDecl = new VarDeclarationElement();
var expectVar = true;
bool hasInitialization = false;
bool breakCycle = false;
for (;;)
{
switch (lexemes[pos].Source)
{
case ",":
{
Compilation.Assert(!expectVar, "Expected variable declaration, not comma", lexemes[pos].Line);
varDecl = new VarDeclarationElement();
expectVar = true;
++pos;
continue;
}
case "=":
hasInitialization = true;
breakCycle = true;
++pos;
break;
case ";":
hasInitialization = false;
breakCycle = true;
++pos;
break;
}
if (breakCycle)
{
break;
}
varDecl.VarType = lexemes[pos].Source;
Compilation.Assert(m_symbols.IsTypeExist(varDecl.VarType), "Unknown type '" + varDecl.VarType + "'",
lexemes[pos].Line);
++pos;
varDecl.VarName = lexemes[pos].Source;
Compilation.Assert(lexemes[pos].Code == Lexeme.CodeType.Name,
"Invalid variable name '" + varDecl.VarName + "'", lexemes[pos].Line);
multipleDecl.AddVar(varDecl);
expectVar = false;
++pos;
}
if (!hasInitialization)
{
foreach (var variable in multipleDecl.GetVars())
{
variable.InitVal = m_symbols.GetDefaultVal(variable.VarType);
}
}
else
{
ValueElement initElements;
pos = ParseExpression(lexemes, pos, -1,
ExpressionFlags.AllowDefaultValue | ExpressionFlags.AllowAutoDefault,
out initElements);
Compilation.Assert(multipleDecl.GetVars().Count == initElements.NumberOfBranches,
"Each variable associated with only one expression (variables: "
+ multipleDecl.GetVars().Count +
", initalization expressions: " + initElements.ChildrenCount(), lexemes[pos - 1].Line);
for (int i = 0, end = multipleDecl.GetVars().Count; i < end; ++i)
{
multipleDecl.GetVar(i).InitVal = (ValueElement)initElements.Child(i);
}
Compilation.Assert(lexemes[pos].Source == ";", "Did you forget ';' ?", lexemes[pos].Line);
++pos; //skip ';'
}
foreach (var i in multipleDecl.GetVars())
{
m_currentFunction.AddLocalVariable(i);
m_currentBlock.Peek().AddLocalVariable(i);
}
elem = multipleDecl;
return(pos);
}