protected static bool HasContinue(ICiStatement stmt)
{
// note: support stmt==null from ifStmt.OnFalse
if (stmt is CiContinue)
{
return(true);
}
CiIf ifStmt = stmt as CiIf;
if (ifStmt != null)
{
return(HasContinue(ifStmt.OnTrue) || HasContinue(ifStmt.OnFalse));
}
CiBlock block = stmt as CiBlock;
if (block != null)
{
return(block.Statements.Any(s => HasContinue(s)));
}
CiSwitch switchStmt = stmt as CiSwitch;
if (switchStmt != null)
{
return(switchStmt.Cases.Any(kase => kase.Body.Any(s => HasContinue(s))));
}
return(false);
}
public virtual void Visit(CiSwitch stmt)
{
Write("switch (");
Write(stmt.Value);
WriteLine(") {");
StartSwitch(stmt);
foreach (CiCase kase in stmt.Cases)
{
foreach (object value in kase.Values)
{
Write("case ");
WriteConst(value);
WriteLine(":");
}
this.Indent++;
StartCase(kase.Body[0]);
Write(kase.Body);
if (kase.Fallthrough)
{
WriteFallthrough(kase.FallthroughTo);
}
this.Indent--;
}
if (stmt.DefaultBody != null)
{
WriteLine("default:");
this.Indent++;
StartCase(stmt.DefaultBody[0]);
Write(stmt.DefaultBody);
this.Indent--;
}
EndSwitch(stmt);
WriteLine("}");
}
void WriteIfCaseBody(CiStatement[] body, bool doWhile)
{
int length = CiSwitch.LengthWithoutTrailingBreak(body);
if (doWhile && CiSwitch.HasEarlyBreak(body))
{
this.Indent++;
WriteLine();
Write("do ");
OpenBlock();
Write(body, length);
CloseBlock();
WriteLine("while (0);");
this.Indent--;
}
else if (length == 1)
{
WriteChild(body[0]);
}
else
{
Write(' ');
OpenBlock();
Write(body, length);
CloseBlock();
}
}
protected override void EndSwitch(CiSwitch stmt)
{
if (stmt.DefaultBody == null)
{
WriteLine("default:");
this.Indent++;
WriteLine("break;");
this.Indent--;
}
}
static bool HasEarlyBreak(CiSwitch stmt)
{
if (stmt.Cases.Any(kase => HasEarlyBreak(kase.Body)))
{
return(true);
}
if (stmt.DefaultBody != null && HasEarlyBreak(stmt.DefaultBody))
{
return(true);
}
return(false);
}
protected override void StartSwitch(CiSwitch stmt)
{
this.Indent++;
foreach (CiCase kase in stmt.Cases)
{
WriteSwitchDefs(kase.Body);
}
if (stmt.DefaultBody != null)
{
WriteSwitchDefs(stmt.DefaultBody);
}
this.Indent--;
}
public override void Visit(CiSwitch stmt)
{
bool oldInSwitch = this.InSwitch;
this.InSwitch = true;
bool oldBreakDoWhile = this.BreakDoWhile;
this.BreakDoWhile = false;
Write("given (");
Write(stmt.Value);
Write(") ");
OpenBlock();
foreach (CiCase kase in stmt.Cases) {
Write("when (");
if (kase.Values.Length > 1) {
Write("[ ");
bool first = true;
foreach (object value in kase.Values) {
if (first)
first = false;
else
Write(", ");
WriteConst(value);
}
Write(" ]");
}
else
WriteConst(kase.Values[0]);
Write(") ");
OpenBlock();
Write(kase.Body, BodyLengthWithoutLastBreak(kase.Body));
if (kase.Fallthrough)
WriteLine("continue;");
CloseBlock();
}
if (stmt.DefaultBody != null) {
int length = BodyLengthWithoutLastBreak(stmt.DefaultBody);
if (length > 0) {
Write("default ");
OpenBlock();
Write(stmt.DefaultBody, length);
CloseBlock();
}
}
CloseBlock();
this.BreakDoWhile = oldBreakDoWhile;
this.InSwitch = oldInSwitch;
}
public override void Visit(CiSwitch statement)
{
if (!(statement.Value.Type is CiStringType))
{
base.Visit(statement);
return;
}
int gotoId = -1;
if (statement.Cases.Any(kase => CiSwitch.HasEarlyBreakAndContinue(kase.Body)) ||
(statement.DefaultBody != null && CiSwitch.HasEarlyBreakAndContinue(statement.DefaultBody)))
{
gotoId = this.StringSwitchesWithGoto.Count;
this.StringSwitchesWithGoto.Add(statement);
}
string op = "if (";
foreach (CiCase kase in statement.Cases)
{
foreach (CiExpr caseValue in kase.Values)
{
Write(op);
WriteEqualString(statement.Value, caseValue, kase.Values.Length == 1 ? CiPriority.Argument : CiPriority.CondOr, false); // FIXME: side effect
op = " || ";
}
Write(')');
WriteIfCaseBody(kase.Body, gotoId < 0);
op = "else if (";
}
if (statement.HasDefault)
{
Write("else");
WriteIfCaseBody(statement.DefaultBody, gotoId < 0);
}
if (gotoId >= 0)
{
Write("ciafterswitch");
VisitLiteralLong(gotoId);
WriteLine(": ;");
}
}
static bool HasSwitchContinueAndEarlyBreak(ICiStatement stmt)
{
CiIf ifStmt = stmt as CiIf;
if (ifStmt != null)
{
return(HasSwitchContinueAndEarlyBreak(ifStmt.OnTrue) || HasSwitchContinueAndEarlyBreak(ifStmt.OnFalse));
}
CiBlock block = stmt as CiBlock;
if (block != null)
{
return(block.Statements.Any(s => HasSwitchContinueAndEarlyBreak(s)));
}
CiSwitch switchStmt = stmt as CiSwitch;
if (switchStmt != null)
{
return(HasEarlyBreak(switchStmt) && HasContinue(switchStmt));
}
return(false);
}
protected virtual void EndSwitch(CiSwitch stmt)
{
}
protected virtual void StartSwitch(CiSwitch stmt)
{
}
public override void Visit(CiSwitch stmt)
{
bool oldInSwitch = this.InSwitch;
this.InSwitch = true;
bool oldBreakDoWhile = this.BreakDoWhile;
this.BreakDoWhile = false;
Write("given (");
Write(stmt.Value);
Write(") ");
OpenBlock();
foreach (CiCase kase in stmt.Cases)
{
Write("when (");
if (kase.Values.Length > 1)
{
Write("[ ");
bool first = true;
foreach (object value in kase.Values)
{
if (first)
{
first = false;
}
else
{
Write(", ");
}
WriteConst(value);
}
Write(" ]");
}
else
{
WriteConst(kase.Values[0]);
}
Write(") ");
OpenBlock();
Write(kase.Body, BodyLengthWithoutLastBreak(kase.Body));
if (kase.Fallthrough)
{
WriteLine("continue;");
}
CloseBlock();
}
if (stmt.DefaultBody != null)
{
int length = BodyLengthWithoutLastBreak(stmt.DefaultBody);
if (length > 0)
{
Write("default ");
OpenBlock();
Write(stmt.DefaultBody, length);
CloseBlock();
}
}
CloseBlock();
this.BreakDoWhile = oldBreakDoWhile;
this.InSwitch = oldInSwitch;
}
CiType LookupType(string name)
{
CiSymbol symbol = this.Symbols.TryLookup(name);
if (symbol is CiType)
{
return((CiType)symbol);
}
if (symbol is CiClass)
{
return new CiClassPtrType {
Name = name, Class = (CiClass)symbol
}
}
;
if (symbol == null)
{
CiType unknown = new CiUnknownType();
unknown.Name = name;
return(unknown);
}
throw new ParseException("{0} is not a type", name);
}
CiType ParseArrayType(CiType baseType)
{
if (Eat(CiToken.LeftBracket))
{
if (Eat(CiToken.RightBracket))
{
return new CiArrayPtrType {
ElementType = ParseArrayType(baseType)
}
}
;
CiExpr len = ParseExpr();
Expect(CiToken.RightBracket);
return(new CiArrayStorageType {
LengthExpr = len,
ElementType = ParseArrayType(baseType)
});
}
return(baseType);
}
CiType ParseType()
{
string baseName = ParseId();
CiType baseType;
if (Eat(CiToken.LeftParenthesis))
{
if (baseName == "string")
{
baseType = new CiStringStorageType {
LengthExpr = ParseExpr()
};
Expect(CiToken.RightParenthesis);
}
else
{
Expect(CiToken.RightParenthesis);
baseType = new CiClassStorageType {
Name = baseName, Class = new CiUnknownClass {
Name = baseName
}
};
}
}
else
{
baseType = LookupType(baseName);
}
return(ParseArrayType(baseType));
}
object ParseConstInitializer(CiType type)
{
if (type is CiArrayType)
{
Expect(CiToken.LeftBrace);
CiType elementType = ((CiArrayType)type).ElementType;
List <object> list = new List <object>();
if (!See(CiToken.RightBrace))
{
do
{
list.Add(ParseConstInitializer(elementType));
}while (Eat(CiToken.Comma));
}
Expect(CiToken.RightBrace);
return(list.ToArray());
}
return(ParseExpr());
}
CiConst ParseConst()
{
Expect(CiToken.Const);
CiConst konst = new CiConst();
konst.Type = ParseType();
konst.Name = ParseId();
Expect(CiToken.Assign);
konst.Value = ParseConstInitializer(konst.Type);
Expect(CiToken.Semicolon);
if (this.Symbols.Parent != null && konst.Type is CiArrayType)
{
this.ConstArrays.Add(konst);
konst.GlobalName = "CiConstArray_" + this.ConstArrays.Count;
}
return(konst);
}
CiBinaryResourceExpr ParseBinaryResource()
{
Expect(CiToken.LeftParenthesis);
CiExpr nameExpr = ParseExpr();
Expect(CiToken.RightParenthesis);
return(new CiBinaryResourceExpr {
NameExpr = nameExpr
});
}
CiExpr ParsePrimaryExpr()
{
if (See(CiToken.Increment) || See(CiToken.Decrement) || See(CiToken.Minus) || See(CiToken.Not))
{
CiToken op = this.CurrentToken;
NextToken();
CiExpr inner = ParsePrimaryExpr();
return(new CiUnaryExpr {
Op = op, Inner = inner
});
}
if (Eat(CiToken.CondNot))
{
CiExpr inner = ParsePrimaryExpr();
return(new CiCondNotExpr {
Inner = inner
});
}
CiExpr result;
if (See(CiToken.IntConstant))
{
result = new CiConstExpr(this.CurrentInt);
NextToken();
}
else if (See(CiToken.StringConstant))
{
result = new CiConstExpr(this.CurrentString);
NextToken();
}
else if (Eat(CiToken.LeftParenthesis))
{
result = ParseExpr();
Expect(CiToken.RightParenthesis);
}
else if (See(CiToken.Id))
{
string name = ParseId();
if (name == "BinaryResource")
{
result = ParseBinaryResource();
}
else
{
CiSymbol symbol = this.Symbols.TryLookup(name);
if (symbol is CiMacro)
{
Expand((CiMacro)symbol);
Expect(CiToken.LeftParenthesis);
result = ParseExpr();
Expect(CiToken.RightParenthesis);
}
else
{
if (symbol == null)
{
symbol = new CiUnknownSymbol {
Name = name
}
}
;
result = new CiSymbolAccess {
Symbol = symbol
};
}
}
}
else if (Eat(CiToken.New))
{
CiType newType = ParseType();
if (!(newType is CiClassStorageType || newType is CiArrayStorageType))
{
throw new ParseException("'new' syntax error");
}
result = new CiNewExpr {
NewType = newType
};
}
else
{
throw new ParseException("Invalid expression");
}
for (;;)
{
if (Eat(CiToken.Dot))
{
result = new CiUnknownMemberAccess {
Parent = result, Name = ParseId()
}
}
;
else if (Eat(CiToken.LeftParenthesis))
{
CiMethodCall call = new CiMethodCall();
call.Obj = result;
List <CiExpr> args = new List <CiExpr>();
if (!See(CiToken.RightParenthesis))
{
do
{
args.Add(ParseExpr());
}while (Eat(CiToken.Comma));
}
Expect(CiToken.RightParenthesis);
call.Arguments = args.ToArray();
result = call;
}
else if (Eat(CiToken.LeftBracket))
{
CiExpr index = ParseExpr();
Expect(CiToken.RightBracket);
result = new CiIndexAccess {
Parent = result, Index = index
};
}
else if (See(CiToken.Increment) || See(CiToken.Decrement))
{
CiToken op = this.CurrentToken;
NextToken();
return(new CiPostfixExpr {
Inner = result, Op = op
});
}
else
{
return(result);
}
}
}
CiExpr ParseMulExpr()
{
CiExpr left = ParsePrimaryExpr();
while (See(CiToken.Asterisk) || See(CiToken.Slash) || See(CiToken.Mod))
{
CiToken op = this.CurrentToken;
NextToken();
left = new CiBinaryExpr {
Left = left, Op = op, Right = ParsePrimaryExpr()
};
}
return(left);
}
CiExpr ParseAddExpr()
{
CiExpr left = ParseMulExpr();
while (See(CiToken.Plus) || See(CiToken.Minus))
{
CiToken op = this.CurrentToken;
NextToken();
left = new CiBinaryExpr {
Left = left, Op = op, Right = ParseMulExpr()
};
}
return(left);
}
CiExpr ParseShiftExpr()
{
CiExpr left = ParseAddExpr();
while (See(CiToken.ShiftLeft) || See(CiToken.ShiftRight))
{
CiToken op = this.CurrentToken;
NextToken();
left = new CiBinaryExpr {
Left = left, Op = op, Right = ParseAddExpr()
};
}
return(left);
}
CiExpr ParseRelExpr()
{
CiExpr left = ParseShiftExpr();
while (See(CiToken.Less) || See(CiToken.LessOrEqual) || See(CiToken.Greater) || See(CiToken.GreaterOrEqual))
{
CiToken op = this.CurrentToken;
NextToken();
left = new CiBoolBinaryExpr {
Left = left, Op = op, Right = ParseShiftExpr()
};
}
return(left);
}
CiExpr ParseEqualityExpr()
{
CiExpr left = ParseRelExpr();
while (See(CiToken.Equal) || See(CiToken.NotEqual))
{
CiToken op = this.CurrentToken;
NextToken();
left = new CiBoolBinaryExpr {
Left = left, Op = op, Right = ParseRelExpr()
};
}
return(left);
}
CiExpr ParseAndExpr()
{
CiExpr left = ParseEqualityExpr();
while (Eat(CiToken.And))
{
left = new CiBinaryExpr {
Left = left, Op = CiToken.And, Right = ParseEqualityExpr()
}
}
;
return(left);
}
CiExpr ParseXorExpr()
{
CiExpr left = ParseAndExpr();
while (Eat(CiToken.Xor))
{
left = new CiBinaryExpr {
Left = left, Op = CiToken.Xor, Right = ParseAndExpr()
}
}
;
return(left);
}
CiExpr ParseOrExpr()
{
CiExpr left = ParseXorExpr();
while (Eat(CiToken.Or))
{
left = new CiBinaryExpr {
Left = left, Op = CiToken.Or, Right = ParseXorExpr()
}
}
;
return(left);
}
CiExpr ParseCondAndExpr()
{
CiExpr left = ParseOrExpr();
while (Eat(CiToken.CondAnd))
{
left = new CiBoolBinaryExpr {
Left = left, Op = CiToken.CondAnd, Right = ParseOrExpr()
}
}
;
return(left);
}
CiExpr ParseCondOrExpr()
{
CiExpr left = ParseCondAndExpr();
while (Eat(CiToken.CondOr))
{
left = new CiBoolBinaryExpr {
Left = left, Op = CiToken.CondOr, Right = ParseCondAndExpr()
}
}
;
return(left);
}
CiExpr ParseExpr()
{
CiExpr left = ParseCondOrExpr();
if (Eat(CiToken.QuestionMark))
{
CiCondExpr result = new CiCondExpr();
result.Cond = left;
result.OnTrue = ParseExpr();
Expect(CiToken.Colon);
result.OnFalse = ParseExpr();
return(result);
}
return(left);
}
CiMaybeAssign ParseMaybeAssign()
{
CiExpr left = ParseExpr();
CiToken op = this.CurrentToken;
if (op == CiToken.Assign || op == CiToken.AddAssign || op == CiToken.SubAssign || op == CiToken.MulAssign || op == CiToken.DivAssign || op == CiToken.ModAssign ||
op == CiToken.AndAssign || op == CiToken.OrAssign || op == CiToken.XorAssign || op == CiToken.ShiftLeftAssign || op == CiToken.ShiftRightAssign)
{
NextToken();
CiAssign result = new CiAssign();
result.Target = left;
result.Op = op;
result.Source = ParseMaybeAssign();
return(result);
}
return(left);
}
ICiStatement ParseExprWithSideEffect()
{
ICiStatement result = ParseMaybeAssign() as ICiStatement;
if (result == null)
{
throw new ParseException("Useless expression");
}
return(result);
}
CiExpr ParseCond()
{
Expect(CiToken.LeftParenthesis);
CiExpr cond = ParseExpr();
Expect(CiToken.RightParenthesis);
return(cond);
}
void OpenScope()
{
this.Symbols = new SymbolTable {
Parent = this.Symbols
};
}
void CloseScope()
{
this.Symbols = this.Symbols.Parent;
}
CiVar ParseVar()
{
CiVar def = new CiVar();
def.Type = ParseType();
def.Name = ParseId();
if (Eat(CiToken.Assign))
{
def.InitialValue = ParseExpr();
}
Expect(CiToken.Semicolon);
this.Symbols.Add(def);
return(def);
}
ICiStatement ParseVarOrExpr()
{
string name = this.CurrentString;
CiSymbol symbol = this.Symbols.TryLookup(name);
if (symbol is CiMacro)
{
NextToken();
Expand((CiMacro)symbol);
return(ParseStatement());
}
// try var
StringBuilder sb = new StringBuilder();
this.CopyTo = sb;
try {
return(ParseVar());
}
catch (ParseException) {
}
finally {
this.CopyTo = null;
}
// try expr
this.CurrentString = name;
this.CurrentToken = CiToken.Id;
BeginExpand("ambigous code", sb.ToString(), null);
SetReader(new StringReader(sb.ToString()));
ICiStatement result = ParseExprWithSideEffect();
Expect(CiToken.Semicolon);
return(result);
}
CiNativeBlock ParseNativeBlock()
{
StringBuilder sb = new StringBuilder();
this.CopyTo = sb;
NextToken();
bool oneLine = true;
try {
if (See(CiToken.LeftBrace))
{
oneLine = false;
sb = new StringBuilder();
this.CopyTo = sb;
Expect(CiToken.LeftBrace);
}
int level = 1;
for (;;)
{
if (oneLine && See(CiToken.Semicolon) && level == 1)
{
break;
}
if (See(CiToken.EndOfFile))
{
throw new ParseException("Native block not terminated");
}
if (See(CiToken.LeftBrace))
{
level++;
}
else if (See(CiToken.RightBrace))
{
if (--level == 0)
{
break;
}
}
NextToken();
}
}
finally {
this.CopyTo = null;
}
NextToken();
Trace.Assert(sb[sb.Length - 1] == '}');
if (!oneLine)
{
sb.Length--;
}
else
{
sb.Append("\n\t");
}
return(new CiNativeBlock {
Content = sb.ToString()
});
}
CiSwitch ParseSwitch()
{
Expect(CiToken.LeftParenthesis);
CiSwitch result = new CiSwitch();
result.Value = ParseExpr();
Expect(CiToken.RightParenthesis);
Expect(CiToken.LeftBrace);
List <CiCase> cases = new List <CiCase>();
while (Eat(CiToken.Case))
{
List <object> values = new List <object>();
do
{
values.Add(ParseExpr());
Expect(CiToken.Colon);
} while (Eat(CiToken.Case));
if (See(CiToken.Default))
{
throw new ParseException("Please remove case before default");
}
CiCase kase = new CiCase {
Values = values.ToArray()
};
List <ICiStatement> statements = new List <ICiStatement>();
do
{
statements.Add(ParseStatement());
}while (!See(CiToken.Case) && !See(CiToken.Default) && !See(CiToken.Goto) && !See(CiToken.RightBrace));
kase.Body = statements.ToArray();
if (Eat(CiToken.Goto))
{
if (Eat(CiToken.Case))
{
kase.FallthroughTo = ParseExpr();
}
else if (Eat(CiToken.Default))
{
kase.FallthroughTo = null;
}
else
{
throw new ParseException("Expected goto case or goto default");
}
Expect(CiToken.Semicolon);
kase.Fallthrough = true;
}
cases.Add(kase);
}
if (cases.Count == 0)
{
throw new ParseException("Switch with no cases");
}
result.Cases = cases.ToArray();
if (Eat(CiToken.Default))
{
Expect(CiToken.Colon);
List <ICiStatement> statements = new List <ICiStatement>();
do
{
statements.Add(ParseStatement());
}while (!See(CiToken.RightBrace));
result.DefaultBody = statements.ToArray();
}
Expect(CiToken.RightBrace);
return(result);
}
ICiStatement ParseStatement()
{
while (Eat(CiToken.Macro))
{
this.Symbols.Add(ParseMacro());
}
if (See(CiToken.Id))
{
return(ParseVarOrExpr());
}
if (See(CiToken.LeftBrace))
{
OpenScope();
CiBlock result = ParseBlock();
CloseScope();
return(result);
}
if (Eat(CiToken.Break))
{
Expect(CiToken.Semicolon);
return(new CiBreak());
}
if (See(CiToken.Const))
{
CiConst konst = ParseConst();
this.Symbols.Add(konst);
return(konst);
}
if (Eat(CiToken.Continue))
{
Expect(CiToken.Semicolon);
return(new CiContinue());
}
if (Eat(CiToken.Delete))
{
CiExpr expr = ParseExpr();
Expect(CiToken.Semicolon);
return(new CiDelete {
Expr = expr
});
}
if (Eat(CiToken.Do))
{
CiDoWhile result = new CiDoWhile();
result.Body = ParseStatement();
Expect(CiToken.While);
result.Cond = ParseCond();
Expect(CiToken.Semicolon);
return(result);
}
if (Eat(CiToken.For))
{
Expect(CiToken.LeftParenthesis);
OpenScope();
CiFor result = new CiFor();
if (See(CiToken.Id))
{
result.Init = ParseVarOrExpr();
}
else
{
Expect(CiToken.Semicolon);
}
if (!See(CiToken.Semicolon))
{
result.Cond = ParseExpr();
}
Expect(CiToken.Semicolon);
if (!See(CiToken.RightParenthesis))
{
result.Advance = ParseExprWithSideEffect();
}
Expect(CiToken.RightParenthesis);
result.Body = ParseStatement();
CloseScope();
return(result);
}
if (Eat(CiToken.If))
{
CiIf result = new CiIf();
result.Cond = ParseCond();
result.OnTrue = ParseStatement();
if (Eat(CiToken.Else))
{
result.OnFalse = ParseStatement();
}
return(result);
}
if (See(CiToken.Native))
{
return(ParseNativeBlock());
}
if (Eat(CiToken.Return))
{
CiReturn result = new CiReturn();
if (this.CurrentMethod.Signature.ReturnType != CiType.Void)
{
result.Value = ParseExpr();
}
Expect(CiToken.Semicolon);
return(result);
}
if (Eat(CiToken.Switch))
{
return(ParseSwitch());
}
if (Eat(CiToken.Throw))
{
CiThrow result = new CiThrow();
result.Message = ParseExpr();
Expect(CiToken.Semicolon);
return(result);
}
if (Eat(CiToken.While))
{
CiWhile result = new CiWhile();
result.Cond = ParseCond();
result.Body = ParseStatement();
return(result);
}
throw new ParseException("Invalid statement");
}
CiBlock ParseBlock()
{
Expect(CiToken.LeftBrace);
List <ICiStatement> statements = new List <ICiStatement>();
while (!Eat(CiToken.RightBrace))
{
statements.Add(ParseStatement());
}
return(new CiBlock {
Statements = statements.ToArray()
});
}
CiParam CreateThis()
{
CiParam thiz = new CiParam();
thiz.Type = new CiClassPtrType {
Name = this.CurrentClass.Name, Class = this.CurrentClass
};
thiz.Name = "this";
this.Symbols.Add(thiz);
return(thiz);
}
CiType ParseReturnType()
{
if (Eat(CiToken.Void))
{
return(CiType.Void);
}
return(ParseType());
}
CiParam[] ParseParams()
{
Expect(CiToken.LeftParenthesis);
List <CiParam> paramz = new List <CiParam>();
if (!See(CiToken.RightParenthesis))
{
do
{
CiParam param = new CiParam();
param.Documentation = ParseDoc();
param.Type = ParseType();
param.Name = ParseId();
this.Symbols.Add(param);
paramz.Add(param);
} while (Eat(CiToken.Comma));
}
Expect(CiToken.RightParenthesis);
return(paramz.ToArray());
}
void ParseMethod(CiMethod method)
{
this.CurrentMethod = method;
OpenScope();
if (method.CallType != CiCallType.Static)
{
method.This = CreateThis();
}
method.Signature.Params = ParseParams();
if (method.CallType == CiCallType.Abstract)
{
Expect(CiToken.Semicolon);
}
else
{
method.Body = ParseBlock();
}
CloseScope();
this.CurrentMethod = null;
}
CiMethod ParseConstructor()
{
NextToken();
Expect(CiToken.LeftParenthesis);
Expect(CiToken.RightParenthesis);
OpenScope();
CiMethod method = new CiMethod(
CiType.Void, "<constructor>")
{
Class = this.CurrentClass,
CallType = CiCallType.Normal,
This = CreateThis()
};
this.CurrentMethod = method;
method.Body = ParseBlock();
CloseScope();
this.CurrentMethod = null;
return(method);
}
CiClass ParseClass()
{
CiClass klass = new CiClass();
klass.SourceFilename = this.Filename;
if (Eat(CiToken.Abstract))
{
klass.IsAbstract = true;
}
Expect(CiToken.Class);
klass.Name = ParseId();
if (Eat(CiToken.Colon))
{
klass.BaseClass = new CiUnknownClass {
Name = ParseId()
}
}
;
Expect(CiToken.LeftBrace);
OpenScope();
this.CurrentClass = klass;
klass.Members = this.Symbols;
while (!Eat(CiToken.RightBrace))
{
CiCodeDoc doc = ParseDoc();
CiVisibility visibility = CiVisibility.Private;
if (Eat(CiToken.Public))
{
visibility = CiVisibility.Public;
}
else if (Eat(CiToken.Internal))
{
visibility = CiVisibility.Internal;
}
CiSymbol symbol;
if (See(CiToken.Const))
{
symbol = ParseConst();
((CiConst)symbol).Class = klass;
}
else if (Eat(CiToken.Macro))
{
if (visibility != CiVisibility.Private)
{
throw new ParseException("Macros must be private");
}
symbol = ParseMacro();
}
else
{
if (See(CiToken.Id) && this.CurrentString == klass.Name)
{
if (klass.Constructor != null)
{
throw new ParseException("Duplicate constructor");
}
klass.Constructor = ParseConstructor();
continue;
}
CiCallType callType;
if (Eat(CiToken.Static))
{
callType = CiCallType.Static;
}
else if (Eat(CiToken.Abstract))
{
if (!klass.IsAbstract)
{
throw new ParseException("Abstract methods only allowed in abstract classes");
}
callType = CiCallType.Abstract;
if (visibility == CiVisibility.Private)
{
visibility = CiVisibility.Internal;
}
}
else if (Eat(CiToken.Virtual))
{
callType = CiCallType.Virtual;
if (visibility == CiVisibility.Private)
{
visibility = CiVisibility.Internal;
}
}
else if (Eat(CiToken.Override))
{
callType = CiCallType.Override;
if (visibility == CiVisibility.Private)
{
visibility = CiVisibility.Internal;
}
}
else
{
callType = CiCallType.Normal;
}
CiType type = ParseReturnType();
string name = ParseId();
if (See(CiToken.LeftParenthesis))
{
CiMethod method = new CiMethod(type, name)
{
Class = klass,
CallType = callType
};
ParseMethod(method);
symbol = method;
}
else
{
if (visibility != CiVisibility.Private)
{
throw new ParseException("Fields must be private");
}
if (callType != CiCallType.Normal)
{
throw new ParseException("Fields cannot be static, abstract, virtual or override");
}
if (type == CiType.Void)
{
throw new ParseException("Field is void");
}
Expect(CiToken.Semicolon);
symbol = new CiField {
Class = klass, Type = type, Name = name
};
}
}
symbol.Documentation = doc;
symbol.Visibility = visibility;
klass.Members.Add(symbol);
}
this.CurrentClass = null;
CloseScope();
klass.ConstArrays = this.ConstArrays.ToArray();
this.ConstArrays.Clear();
return(klass);
}
CiDelegate ParseDelegate()
{
CiDelegate del = new CiDelegate();
Expect(CiToken.Delegate);
del.ReturnType = ParseReturnType();
del.Name = ParseId();
OpenScope();
del.Params = ParseParams();
CloseScope();
Expect(CiToken.Semicolon);
return(del);
}
public void Parse(string filename, TextReader reader)
{
Open(filename, reader);
while (!See(CiToken.EndOfFile))
{
CiCodeDoc doc = ParseDoc();
bool pub = Eat(CiToken.Public);
CiSymbol symbol;
if (See(CiToken.Enum))
{
symbol = ParseEnum();
}
else if (See(CiToken.Class) || See(CiToken.Abstract))
{
symbol = ParseClass();
}
else if (See(CiToken.Delegate))
{
symbol = ParseDelegate();
}
else
{
throw new ParseException("Expected class, enum or delegate");
}
symbol.Documentation = doc;
symbol.Visibility = pub ? CiVisibility.Public : CiVisibility.Internal;
this.Symbols.Add(symbol);
}
}
public CiProgram Program
{
get
{
return(new CiProgram {
Globals = this.Symbols
});
}
}
}
}
public override void Visit(CiSwitch stmt)
{
bool oldBreakDoWhile = this.BreakDoWhile;
this.BreakDoWhile = false;
bool hasEarlyBreak = HasEarlyBreak(stmt);
bool oldInEarlyBreakSwitch = this.InEarlyBreakSwitch;
if (hasEarlyBreak)
{
this.InEarlyBreakSwitch = true;
OpenBlock(); // block that "last" will exit
}
bool tmpVar = stmt.Value.HasSideEffect;
if (tmpVar)
{
Write("my $CISWITCH = ");
Write(stmt.Value);
WriteLine(";");
}
bool first = true;
foreach (CiCase kase in stmt.Cases)
{
if (!first)
{
Write("els");
}
Write("if (");
first = true;
// TODO: optimize ranges "case 1: case 2: case 3:"
foreach (object value in kase.Values)
{
if (first)
{
first = false;
}
else
{
Write(" || ");
}
if (tmpVar)
{
Write("$CISWITCH");
}
else
{
WriteChild(7, stmt.Value);
}
Write(" == ");
WriteConst(value);
}
Write(") ");
OpenBlock();
Write(kase.Body, BodyLengthWithoutLastBreak(kase.Body));
// TODO: fallthrough
CloseBlock();
Debug.Assert(!first);
}
if (stmt.DefaultBody != null)
{
int length = BodyLengthWithoutLastBreak(stmt.DefaultBody);
if (length > 0)
{
Write("else ");
OpenBlock();
Write(stmt.DefaultBody, length);
CloseBlock();
}
}
if (hasEarlyBreak)
{
CloseBlock();
this.InEarlyBreakSwitch = oldInEarlyBreakSwitch;
}
this.BreakDoWhile = oldBreakDoWhile;
}
public abstract void Visit(CiSwitch statement);
public override void Visit(CiSwitch stmt)
{
bool oldBreakDoWhile = this.BreakDoWhile;
this.BreakDoWhile = false;
bool hasEarlyBreak = HasEarlyBreak(stmt);
bool oldInEarlyBreakSwitch = this.InEarlyBreakSwitch;
if (hasEarlyBreak) {
this.InEarlyBreakSwitch = true;
OpenBlock(); // block that "last" will exit
}
bool tmpVar = stmt.Value.HasSideEffect;
if (tmpVar) {
Write("my $CISWITCH = ");
Write(stmt.Value);
WriteLine(";");
}
bool first = true;
foreach (CiCase kase in stmt.Cases) {
if (!first)
Write("els");
Write("if (");
first = true;
// TODO: optimize ranges "case 1: case 2: case 3:"
foreach (object value in kase.Values) {
if (first)
first = false;
else
Write(" || ");
if (tmpVar)
Write("$CISWITCH");
else
WriteChild(CiPriority.Equality, stmt.Value);
Write(" == ");
WriteConst(value);
}
Write(") ");
OpenBlock();
Write(kase.Body, BodyLengthWithoutLastBreak(kase.Body));
// TODO: fallthrough
CloseBlock();
Debug.Assert(!first);
}
if (stmt.DefaultBody != null) {
int length = BodyLengthWithoutLastBreak(stmt.DefaultBody);
if (length > 0) {
Write("else ");
OpenBlock();
Write(stmt.DefaultBody, length);
CloseBlock();
}
}
if (hasEarlyBreak) {
CloseBlock();
this.InEarlyBreakSwitch = oldInEarlyBreakSwitch;
}
this.BreakDoWhile = oldBreakDoWhile;
}
protected override void EndSwitch(CiSwitch stmt)
{
if (stmt.DefaultBody == null) {
WriteLine("default:");
this.Indent++;
WriteLine("break;");
this.Indent--;
}
}
protected virtual void EndSwitch(CiSwitch stmt)
{
}
public virtual void Visit(CiSwitch stmt)
{
Write("switch (");
Write(stmt.Value);
WriteLine(") {");
StartSwitch(stmt);
foreach (CiCase kase in stmt.Cases) {
foreach (object value in kase.Values) {
Write("case ");
WriteConst(value);
WriteLine(":");
}
this.Indent++;
StartCase(kase.Body[0]);
Write(kase.Body);
if (kase.Fallthrough)
WriteFallthrough(kase.FallthroughTo);
this.Indent--;
}
if (stmt.DefaultBody != null) {
WriteLine("default:");
this.Indent++;
StartCase(stmt.DefaultBody[0]);
Write(stmt.DefaultBody);
this.Indent--;
}
EndSwitch(stmt);
WriteLine("}");
}
public override abstract void Visit(CiSwitch stmt);
void ICiStatementVisitor.Visit(CiSwitch statement)
{
statement.Value = Resolve(statement.Value);
CiType type = statement.Value.Type;
CiCondCompletionStatement oldLoopOrSwitch = this.CurrentLoopOrSwitch;
this.CurrentLoopOrSwitch = statement;
HashSet<object> values = new HashSet<object>();
CiCase fallthroughFrom = null;
foreach (CiCase kase in statement.Cases) {
for (int i = 0; i < kase.Values.Length; i++) {
kase.Values[i] = ResolveConstExpr((CiExpr) kase.Values[i], type);
if (!values.Add(kase.Values[i]))
throw new ResolveException("Duplicate case value");
}
if (fallthroughFrom != null) {
if (fallthroughFrom.FallthroughTo == null)
throw new ResolveException("goto default followed by case");
if (!ResolveConstExpr(fallthroughFrom.FallthroughTo, type).Equals(kase.Values[0]))
throw new ResolveException("goto case doesn't match the next case");
}
bool reachable = Resolve(kase.Body);
if (kase.Fallthrough) {
if (!reachable)
throw new ResolveException("goto is not reachable");
fallthroughFrom = kase;
}
else {
if (reachable)
throw new ResolveException("case must end with break, return, throw or goto");
fallthroughFrom = null;
}
}
if (statement.DefaultBody != null) {
if (fallthroughFrom != null && fallthroughFrom.FallthroughTo != null)
throw new ResolveException("goto case followed by default");
bool reachable = Resolve(statement.DefaultBody);
if (reachable)
throw new ResolveException("default must end with break, return, throw or goto");
}
else {
if (fallthroughFrom != null)
throw new ResolveException("goto cannot be the last statement in switch");
}
this.CurrentLoopOrSwitch = oldLoopOrSwitch;
}
CiExpr ParseConstInitializer()
{
if (Eat(CiToken.LeftBrace))
{
return new CiCollection {
Line = this.Line, Items = ParseCollection(CiToken.RightBrace)
}
}
;
return(ParseExpr());
}
CiExpr[] ParseCollection(CiToken closing)
{
List <CiExpr> items = new List <CiExpr>();
if (!See(closing))
{
do
{
items.Add(ParseExpr());
}while (Eat(CiToken.Comma));
}
Expect(closing);
return(items.ToArray());
}
void CheckXcrementParent()
{
if (this.XcrementParent != null)
{
string op = this.CurrentToken == CiToken.Increment ? "++" : "--";
throw ParseException(op + " not allowed on the right side of " + this.XcrementParent);
}
}
bool SeeDigit()
{
int c = PeekChar();
return(c >= '0' && c <= '9');
}
CiInterpolatedString ParseInterpolatedString()
{
int line = this.Line;
List <CiInterpolatedPart> parts = new List <CiInterpolatedPart>();
do
{
string prefix = (string)this.CurrentValue;
NextToken();
CiExpr arg = ParseExpr();
CiExpr width = null;
char format = ' ';
int precision = -1;
if (Eat(CiToken.Comma))
{
width = ParseExpr();
}
if (See(CiToken.Colon))
{
format = (char)ReadChar();
if ("DdEeFfGgXx".IndexOf(format) < 0)
{
throw ParseException("Invalid format specifier");
}
if (SeeDigit())
{
precision = ReadChar() - '0';
if (SeeDigit())
{
precision = precision * 10 + ReadChar() - '0';
}
}
NextToken();
}
parts.Add(new CiInterpolatedPart(prefix, arg)
{
WidthExpr = width, Format = format, Precision = precision
});
Check(CiToken.RightBrace);
} while (ReadInterpolatedString() == CiToken.InterpolatedString);
string suffix = (string)this.CurrentValue;
NextToken();
return(new CiInterpolatedString(parts.ToArray(), suffix)
{
Line = line
});
}
CiExpr ParseParenthesized()
{
Expect(CiToken.LeftParenthesis);
CiExpr result = ParseExpr();
Expect(CiToken.RightParenthesis);
return(result);
}
CiExpr ParsePrimaryExpr()
{
CiExpr result;
switch (this.CurrentToken)
{
case CiToken.Increment:
case CiToken.Decrement:
CheckXcrementParent();
goto case CiToken.Minus;
case CiToken.Minus:
case CiToken.Tilde:
case CiToken.ExclamationMark:
case CiToken.New:
return(new CiPrefixExpr {
Line = this.Line, Op = NextToken(), Inner = ParsePrimaryExpr()
});
case CiToken.Literal:
result = new CiLiteral(this.CurrentValue)
{
Line = this.Line
};
NextToken();
break;
case CiToken.InterpolatedString:
result = ParseInterpolatedString();
break;
case CiToken.LeftParenthesis:
Expect(CiToken.LeftParenthesis);
result = ParseType();
Expect(CiToken.RightParenthesis);
break;
case CiToken.Id:
result = ParseSymbolReference(null);
break;
case CiToken.List:
result = ParseListType();
break;
case CiToken.Dictionary:
result = ParseDictionaryType(CiSystem.DictionaryClass);
break;
case CiToken.SortedDictionary:
result = ParseDictionaryType(CiSystem.SortedDictionaryClass);
break;
case CiToken.Resource:
NextToken();
Expect(CiToken.Less);
if (ParseId() != "byte")
{
throw ParseException("Expected resource<byte[]>");
}
Expect(CiToken.LeftBracket);
Expect(CiToken.RightBracket);
Expect(CiToken.Greater);
result = new CiPrefixExpr {
Line = this.Line, Op = CiToken.Resource, Inner = ParseParenthesized()
};
break;
default:
throw ParseException("Invalid expression");
}
for (;;)
{
switch (this.CurrentToken)
{
case CiToken.Dot:
NextToken();
result = ParseSymbolReference(result);
break;
case CiToken.LeftParenthesis:
if (!(result is CiSymbolReference symbol))
{
throw ParseException("Expected a method");
}
NextToken();
result = new CiCallExpr {
Line = this.Line, Method = symbol, Arguments = ParseCollection(CiToken.RightParenthesis)
};
break;
case CiToken.LeftBracket:
result = new CiBinaryExpr {
Line = this.Line, Left = result, Op = NextToken(), Right = See(CiToken.RightBracket) ? null : ParseExpr()
};
Expect(CiToken.RightBracket);
break;
case CiToken.Increment:
case CiToken.Decrement:
CheckXcrementParent();
goto case CiToken.ExclamationMark;
case CiToken.ExclamationMark:
case CiToken.Hash:
result = new CiPostfixExpr {
Line = this.Line, Inner = result, Op = NextToken()
};
break;
default:
return(result);
}
}
}
CiExpr ParseMulExpr()
{
CiExpr left = ParsePrimaryExpr();
for (;;)
{
switch (this.CurrentToken)
{
case CiToken.Asterisk:
case CiToken.Slash:
case CiToken.Mod:
left = new CiBinaryExpr {
Line = this.Line, Left = left, Op = NextToken(), Right = ParsePrimaryExpr()
};
break;
default:
return(left);
}
}
}
CiExpr ParseAddExpr()
{
CiExpr left = ParseMulExpr();
while (See(CiToken.Plus) || See(CiToken.Minus))
{
left = new CiBinaryExpr {
Line = this.Line, Left = left, Op = NextToken(), Right = ParseMulExpr()
}
}
;
return(left);
}
CiExpr ParseShiftExpr()
{
CiExpr left = ParseAddExpr();
while (See(CiToken.ShiftLeft) || See(CiToken.ShiftRight))
{
left = new CiBinaryExpr {
Line = this.Line, Left = left, Op = NextToken(), Right = ParseAddExpr()
}
}
;
return(left);
}
CiExpr ParseRelExpr()
{
CiExpr left = ParseShiftExpr();
for (;;)
{
switch (this.CurrentToken)
{
case CiToken.Less:
case CiToken.LessOrEqual:
case CiToken.Greater:
case CiToken.GreaterOrEqual:
left = new CiBinaryExpr {
Line = this.Line, Left = left, Op = NextToken(), Right = ParseShiftExpr()
};
break;
default:
return(left);
}
}
}
CiExpr ParseEqualityExpr()
{
CiExpr left = ParseRelExpr();
while (See(CiToken.Equal) || See(CiToken.NotEqual))
{
left = new CiBinaryExpr {
Line = this.Line, Left = left, Op = NextToken(), Right = ParseRelExpr()
}
}
;
return(left);
}
CiExpr ParseAndExpr()
{
CiExpr left = ParseEqualityExpr();
while (See(CiToken.And))
{
left = new CiBinaryExpr {
Line = this.Line, Left = left, Op = NextToken(), Right = ParseEqualityExpr()
}
}
;
return(left);
}
CiExpr ParseXorExpr()
{
CiExpr left = ParseAndExpr();
while (See(CiToken.Xor))
{
left = new CiBinaryExpr {
Line = this.Line, Left = left, Op = NextToken(), Right = ParseAndExpr()
}
}
;
return(left);
}
CiExpr ParseOrExpr()
{
CiExpr left = ParseXorExpr();
while (See(CiToken.Or))
{
left = new CiBinaryExpr {
Line = this.Line, Left = left, Op = NextToken(), Right = ParseXorExpr()
}
}
;
return(left);
}
CiExpr ParseCondAndExpr()
{
CiExpr left = ParseOrExpr();
while (See(CiToken.CondAnd))
{
string saveXcrementParent = this.XcrementParent;
this.XcrementParent = "&&";
left = new CiBinaryExpr {
Line = this.Line, Left = left, Op = NextToken(), Right = ParseOrExpr()
};
this.XcrementParent = saveXcrementParent;
}
return(left);
}
CiExpr ParseCondOrExpr()
{
CiExpr left = ParseCondAndExpr();
while (See(CiToken.CondOr))
{
string saveXcrementParent = this.XcrementParent;
this.XcrementParent = "||";
left = new CiBinaryExpr {
Line = this.Line, Left = left, Op = NextToken(), Right = ParseCondAndExpr()
};
this.XcrementParent = saveXcrementParent;
}
return(left);
}
CiExpr ParseExpr()
{
CiExpr left = ParseCondOrExpr();
if (See(CiToken.QuestionMark))
{
CiSelectExpr result = new CiSelectExpr {
Line = this.Line, Cond = left
};
NextToken();
string saveXcrementParent = this.XcrementParent;
this.XcrementParent = "?";
result.OnTrue = ParseExpr();
Expect(CiToken.Colon);
result.OnFalse = ParseExpr();
this.XcrementParent = saveXcrementParent;
return(result);
}
return(left);
}
CiExpr ParseType()
{
CiExpr left = ParseExpr();
if (Eat(CiToken.Range))
{
return new CiBinaryExpr {
Line = this.Line, Left = left, Op = CiToken.Range, Right = ParseExpr()
}
}
;
return(left);
}
CiExpr ParseAssign(bool allowVar)
{
CiExpr left = ParseType();
switch (this.CurrentToken)
{
case CiToken.Assign:
case CiToken.AddAssign:
case CiToken.SubAssign:
case CiToken.MulAssign:
case CiToken.DivAssign:
case CiToken.ModAssign:
case CiToken.AndAssign:
case CiToken.OrAssign:
case CiToken.XorAssign:
case CiToken.ShiftLeftAssign:
case CiToken.ShiftRightAssign:
return(new CiBinaryExpr {
Line = this.Line, Left = left, Op = NextToken(), Right = ParseAssign(false)
});
case CiToken.Id:
if (allowVar)
{
return(ParseVar(left));
}
return(left);
default:
return(left);
}
}
CiVar ParseVar(CiExpr type)
{
CiVar def = new CiVar {
Line = this.Line, TypeExpr = type, Name = ParseId()
};
if (Eat(CiToken.Assign))
{
def.Value = ParseAssign(false);
}
return(def);
}
CiVar ParseVar()
{
return(ParseVar(ParseType()));
}
CiConst ParseConst()
{
Expect(CiToken.Const);
CiConst konst = new CiConst {
Line = this.Line, TypeExpr = ParseType(), Name = ParseId()
};
Expect(CiToken.Assign);
konst.Value = ParseConstInitializer();
Expect(CiToken.Semicolon);
return(konst);
}
CiBlock ParseBlock()
{
int line = this.Line;
Expect(CiToken.LeftBrace);
List <CiStatement> statements = new List <CiStatement>();
while (!Eat(CiToken.RightBrace))
{
statements.Add(ParseStatement());
}
return(new CiBlock {
Line = line, Statements = statements.ToArray()
});
}
CiAssert ParseAssert()
{
CiAssert result = new CiAssert {
Line = this.Line
};
Expect(CiToken.Assert);
result.Cond = ParseExpr();
if (Eat(CiToken.Comma))
{
result.Message = ParseExpr();
}
Expect(CiToken.Semicolon);
return(result);
}
CiBreak ParseBreak()
{
if (this.CurrentLoopOrSwitch == null)
{
throw ParseException("break outside loop or switch");
}
CiBreak result = new CiBreak(this.CurrentLoopOrSwitch)
{
Line = this.Line
};
Expect(CiToken.Break);
Expect(CiToken.Semicolon);
if (this.CurrentLoopOrSwitch is CiLoop loop)
{
loop.HasBreak = true;
}
return(result);
}
CiContinue ParseContinue()
{
if (this.CurrentLoop == null)
{
throw ParseException("continue outside loop");
}
CiContinue result = new CiContinue(this.CurrentLoop)
{
Line = this.Line
};
Expect(CiToken.Continue);
Expect(CiToken.Semicolon);
return(result);
}
void ParseLoopBody(CiLoop loop)
{
CiLoop outerLoop = this.CurrentLoop;
CiCondCompletionStatement outerLoopOrSwitch = this.CurrentLoopOrSwitch;
this.CurrentLoopOrSwitch = this.CurrentLoop = loop;
loop.Body = ParseStatement();
this.CurrentLoopOrSwitch = outerLoopOrSwitch;
this.CurrentLoop = outerLoop;
}
CiDoWhile ParseDoWhile()
{
CiDoWhile result = new CiDoWhile {
Line = this.Line
};
Expect(CiToken.Do);
ParseLoopBody(result);
Expect(CiToken.While);
result.Cond = ParseParenthesized();
Expect(CiToken.Semicolon);
return(result);
}
CiFor ParseFor()
{
CiFor result = new CiFor {
Line = this.Line
};
Expect(CiToken.For);
Expect(CiToken.LeftParenthesis);
if (!See(CiToken.Semicolon))
{
result.Init = ParseAssign(true);
}
Expect(CiToken.Semicolon);
if (!See(CiToken.Semicolon))
{
result.Cond = ParseExpr();
}
Expect(CiToken.Semicolon);
if (!See(CiToken.RightParenthesis))
{
result.Advance = ParseAssign(false);
}
Expect(CiToken.RightParenthesis);
ParseLoopBody(result);
return(result);
}
void ParseForeachIterator(CiForeach result)
{
result.Add(new CiVar {
Line = this.Line, TypeExpr = ParseType(), Name = ParseId()
});
}
CiForeach ParseForeach()
{
CiForeach result = new CiForeach {
Line = this.Line
};
Expect(CiToken.Foreach);
Expect(CiToken.LeftParenthesis);
if (Eat(CiToken.LeftParenthesis))
{
ParseForeachIterator(result);
Expect(CiToken.Comma);
ParseForeachIterator(result);
Expect(CiToken.RightParenthesis);
}
else
{
ParseForeachIterator(result);
}
Expect(CiToken.In);
result.Collection = ParseExpr();
Expect(CiToken.RightParenthesis);
ParseLoopBody(result);
return(result);
}
CiIf ParseIf()
{
CiIf result = new CiIf {
Line = this.Line
};
Expect(CiToken.If);
result.Cond = ParseParenthesized();
result.OnTrue = ParseStatement();
if (Eat(CiToken.Else))
{
result.OnFalse = ParseStatement();
}
return(result);
}
CiNative ParseNative()
{
int line = this.Line;
Expect(CiToken.Native);
StringBuilder sb = new StringBuilder();
this.CopyTo = sb;
try {
Expect(CiToken.LeftBrace);
int nesting = 1;
for (;;)
{
if (See(CiToken.EndOfFile))
{
throw ParseException("Native block not terminated");
}
if (See(CiToken.LeftBrace))
{
nesting++;
}
else if (See(CiToken.RightBrace) && --nesting == 0)
{
break;
}
NextToken();
}
}
finally {
this.CopyTo = null;
}
NextToken();
Trace.Assert(sb[sb.Length - 1] == '}');
sb.Length--;
return(new CiNative {
Line = line, Content = sb.ToString()
});
}
CiReturn ParseReturn()
{
CiReturn result = new CiReturn {
Line = this.Line
};
NextToken();
if (!See(CiToken.Semicolon))
{
result.Value = ParseExpr();
}
Expect(CiToken.Semicolon);
return(result);
}
CiSwitch ParseSwitch()
{
CiSwitch result = new CiSwitch {
Line = this.Line
};
Expect(CiToken.Switch);
result.Value = ParseParenthesized();
Expect(CiToken.LeftBrace);
CiCondCompletionStatement outerLoopOrSwitch = this.CurrentLoopOrSwitch;
this.CurrentLoopOrSwitch = result;
List <CiCase> cases = new List <CiCase>();
while (Eat(CiToken.Case))
{
List <CiExpr> values = new List <CiExpr>();
CiExpr value;
do
{
value = ParseExpr();
values.Add(value);
Expect(CiToken.Colon);
} while (Eat(CiToken.Case));
if (See(CiToken.Default))
{
throw StatementException(value, "Please remove case before default");
}
CiCase kase = new CiCase {
Values = values.ToArray()
};
List <CiStatement> statements = new List <CiStatement>();
for (;;)
{
statements.Add(ParseStatement());
switch (this.CurrentToken)
{
case CiToken.Case:
case CiToken.Default:
case CiToken.RightBrace:
break;
default:
continue;
}
break;
}
kase.Body = statements.ToArray();
cases.Add(kase);
}
if (cases.Count == 0)
{
throw ParseException("Switch with no cases");
}
result.Cases = cases.ToArray();
if (Eat(CiToken.Default))
{
Expect(CiToken.Colon);
List <CiStatement> statements = new List <CiStatement>();
do
{
statements.Add(ParseStatement());
}while (!See(CiToken.RightBrace));
result.DefaultBody = statements.ToArray();
}
Expect(CiToken.RightBrace);
this.CurrentLoopOrSwitch = outerLoopOrSwitch;
return(result);
}
CiThrow ParseThrow()
{
CiThrow result = new CiThrow {
Line = this.Line
};
Expect(CiToken.Throw);
result.Message = ParseExpr();
Expect(CiToken.Semicolon);
return(result);
}
CiWhile ParseWhile()
{
CiWhile result = new CiWhile {
Line = this.Line
};
Expect(CiToken.While);
result.Cond = ParseParenthesized();
ParseLoopBody(result);
return(result);
}
CiStatement ParseStatement()
{
switch (this.CurrentToken)
{
case CiToken.LeftBrace:
return(ParseBlock());
case CiToken.Assert:
return(ParseAssert());
case CiToken.Break:
return(ParseBreak());
case CiToken.Const:
return(ParseConst());
case CiToken.Continue:
return(ParseContinue());
case CiToken.Do:
return(ParseDoWhile());
case CiToken.For:
return(ParseFor());
case CiToken.Foreach:
return(ParseForeach());
case CiToken.If:
return(ParseIf());
case CiToken.Native:
return(ParseNative());
case CiToken.Return:
return(ParseReturn());
case CiToken.Switch:
return(ParseSwitch());
case CiToken.Throw:
return(ParseThrow());
case CiToken.While:
return(ParseWhile());
default:
CiExpr expr = ParseAssign(true);
Expect(CiToken.Semicolon);
return(expr);
}
}
CiCallType ParseCallType()
{
switch (this.CurrentToken)
{
case CiToken.Static:
NextToken();
return(CiCallType.Static);
case CiToken.Abstract:
NextToken();
return(CiCallType.Abstract);
case CiToken.Virtual:
NextToken();
return(CiCallType.Virtual);
case CiToken.Override:
NextToken();
return(CiCallType.Override);
case CiToken.Sealed:
NextToken();
return(CiCallType.Sealed);
default:
return(CiCallType.Normal);
}
}
void ParseMethod(CiMethod method)
{
method.IsMutator = Eat(CiToken.ExclamationMark);
Expect(CiToken.LeftParenthesis);
if (!See(CiToken.RightParenthesis))
{
do
{
CiCodeDoc doc = ParseDoc();
CiVar param = ParseVar();
param.Documentation = doc;
method.Parameters.Add(param);
} while (Eat(CiToken.Comma));
}
Expect(CiToken.RightParenthesis);
method.Throws = Eat(CiToken.Throws);
if (method.CallType == CiCallType.Abstract)
{
Expect(CiToken.Semicolon);
}
else if (See(CiToken.FatArrow))
{
method.Body = ParseReturn();
}
else
{
method.Body = ParseBlock();
}
}
public CiClass ParseClass(CiCallType callType)
{
Expect(CiToken.Class);
CiClass klass = new CiClass {
Parent = this.Program, Filename = this.Filename, Line = this.Line, CallType = callType, Name = ParseId()
};
if (Eat(CiToken.Colon))
{
klass.BaseClassName = ParseId();
}
Expect(CiToken.LeftBrace);
List <CiConst> consts = new List <CiConst>();
List <CiField> fields = new List <CiField>();
List <CiMethod> methods = new List <CiMethod>();
while (!Eat(CiToken.RightBrace))
{
CiCodeDoc doc = ParseDoc();
CiVisibility visibility;
switch (this.CurrentToken)
{
case CiToken.Internal:
visibility = CiVisibility.Internal;
NextToken();
break;
case CiToken.Protected:
visibility = CiVisibility.Protected;
NextToken();
break;
case CiToken.Public:
visibility = CiVisibility.Public;
NextToken();
break;
default:
visibility = CiVisibility.Private;
break;
}
if (See(CiToken.Const))
{
// const
CiConst konst = ParseConst();
konst.Documentation = doc;
konst.Visibility = visibility;
consts.Add(konst);
continue;
}
callType = ParseCallType();
// \ class | static | normal | abstract | sealed
// method \| | | |
// --------+--------+--------+----------+-------
// static | + | + | + | +
// normal | - | + | + | +
// abstract| - | - | + | -
// virtual | - | + | + | -
// override| - | + | + | +
// sealed | - | + | + | +
if (callType == CiCallType.Static || klass.CallType == CiCallType.Abstract)
{
// ok
}
else if (klass.CallType == CiCallType.Static)
{
throw ParseException("Only static members allowed in a static class");
}
else if (callType == CiCallType.Abstract)
{
throw ParseException("Abstract methods allowed only in an abstract class");
}
else if (klass.CallType == CiCallType.Sealed && callType == CiCallType.Virtual)
{
throw ParseException("Virtual methods disallowed in a sealed class");
}
if (visibility == CiVisibility.Private && callType != CiCallType.Static && callType != CiCallType.Normal)
{
throw ParseException("{0} method cannot be private", callType);
}
CiExpr type = Eat(CiToken.Void) ? null : ParseType();
if (See(CiToken.LeftBrace) && type is CiCallExpr call)
{
// constructor
if (call.Method.Name != klass.Name)
{
throw ParseException("Constructor name doesn't match class name");
}
if (callType != CiCallType.Normal)
{
throw ParseException("Constructor cannot be {0}", callType);
}
if (call.Arguments.Length != 0)
{
throw ParseException("Constructor parameters not supported");
}
if (klass.Constructor != null)
{
throw ParseException("Duplicate constructor, already defined in line {0}", klass.Constructor.Line);
}
if (visibility == CiVisibility.Private)
{
visibility = CiVisibility.Internal; // TODO
}
klass.Constructor = new CiMethodBase {
Line = call.Line, Documentation = doc, Visibility = visibility, Parent = klass, Name = klass.Name, Body = ParseBlock()
};
continue;
}
int line = this.Line;
string name = ParseId();
if (See(CiToken.LeftParenthesis) || See(CiToken.ExclamationMark))
{
// method
CiMethod method = new CiMethod {
Line = line, Documentation = doc, Visibility = visibility, CallType = callType, TypeExpr = type, Name = name
};
method.Parameters.Parent = klass;
ParseMethod(method);
methods.Add(method);
continue;
}
// field
if (visibility == CiVisibility.Public)
{
throw ParseException("Field cannot be public");
}
if (callType != CiCallType.Normal)
{
throw ParseException("Field cannot be {0}", callType);
}
if (type == null)
{
throw ParseException("Field cannot be void");
}
CiField field = new CiField {
Line = line, Documentation = doc, Visibility = visibility, TypeExpr = type, Name = name
};
if (Eat(CiToken.Assign))
{
field.Value = ParseExpr();
}
Expect(CiToken.Semicolon);
fields.Add(field);
}
klass.Consts = consts.ToArray();
klass.Fields = fields.ToArray();
klass.Methods = methods.ToArray();
return(klass);
}
public CiEnum ParseEnum()
{
Expect(CiToken.Enum);
CiEnum enu = new CiEnum {
Parent = this.Program, Filename = this.Filename, IsFlags = Eat(CiToken.Asterisk), Line = this.Line, Name = ParseId()
};
Expect(CiToken.LeftBrace);
do
{
CiConst konst = new CiConst {
Visibility = CiVisibility.Public, Documentation = ParseDoc(), Line = this.Line, Name = ParseId(), Type = enu
};
if (Eat(CiToken.Assign))
{
konst.Value = ParseExpr();
}
else if (enu.IsFlags)
{
throw ParseException("enum* symbol must be assigned a value");
}
enu.Add(konst);
} while (Eat(CiToken.Comma));
Expect(CiToken.RightBrace);
return(enu);
}
public void Parse(string filename, TextReader reader)
{
Open(filename, reader);
while (!See(CiToken.EndOfFile))
{
CiCodeDoc doc = ParseDoc();
CiContainerType type;
bool isPublic = Eat(CiToken.Public);
switch (this.CurrentToken)
{
// class
case CiToken.Class:
type = ParseClass(CiCallType.Normal);
break;
case CiToken.Static:
case CiToken.Abstract:
case CiToken.Sealed:
type = ParseClass(ParseCallType());
break;
// enum
case CiToken.Enum:
type = ParseEnum();
break;
// native
case CiToken.Native:
this.Program.TopLevelNatives.Add(ParseNative().Content);
continue;
default:
throw ParseException("Expected class or enum");
}
type.Documentation = doc;
type.IsPublic = isPublic;
this.Program.Add(type);
}
}
}
}
CiSwitch ParseSwitch()
{
Expect(CiToken.LeftParenthesis);
CiSwitch result = new CiSwitch();
result.Value = ParseExpr();
Expect(CiToken.RightParenthesis);
Expect(CiToken.LeftBrace);
List<CiCase> cases = new List<CiCase>();
while (Eat(CiToken.Case)) {
List<object> values = new List<object>();
do {
values.Add(ParseExpr());
Expect(CiToken.Colon);
} while (Eat(CiToken.Case));
if (See(CiToken.Default))
throw new ParseException("Please remove case before default");
CiCase kase = new CiCase { Values = values.ToArray() };
List<ICiStatement> statements = new List<ICiStatement>();
do
statements.Add(ParseStatement());
while (!See(CiToken.Case) && !See(CiToken.Default) && !See(CiToken.Goto) && !See(CiToken.RightBrace));
kase.Body = statements.ToArray();
if (Eat(CiToken.Goto)) {
if (Eat(CiToken.Case))
kase.FallthroughTo = ParseExpr();
else if (Eat(CiToken.Default))
kase.FallthroughTo = null;
else
throw new ParseException("Expected goto case or goto default");
Expect(CiToken.Semicolon);
kase.Fallthrough = true;
}
cases.Add(kase);
}
if (cases.Count == 0)
throw new ParseException("Switch with no cases");
result.Cases = cases.ToArray();
if (Eat(CiToken.Default)) {
Expect(CiToken.Colon);
List<ICiStatement> statements = new List<ICiStatement>();
do
statements.Add(ParseStatement());
while (!See(CiToken.RightBrace));
result.DefaultBody = statements.ToArray();
}
Expect(CiToken.RightBrace);
return result;
}
static bool HasEarlyBreak(CiSwitch stmt)
{
if (stmt.Cases.Any(kase => HasEarlyBreak(kase.Body)))
return true;
if (stmt.DefaultBody != null && HasEarlyBreak(stmt.DefaultBody))
return true;
return false;
}
protected virtual void StartSwitch(CiSwitch stmt)
{
}
public override abstract void Visit(CiSwitch stmt);
protected override void StartSwitch(CiSwitch stmt)
{
this.Indent++;
foreach (CiCase kase in stmt.Cases)
WriteSwitchDefs(kase.Body);
if (stmt.DefaultBody != null)
WriteSwitchDefs(stmt.DefaultBody);
this.Indent--;
}
CiExpr ParseAddExpr()
{
CiExpr left = ParseMulExpr();
while (See(CiToken.Plus) || See(CiToken.Minus))
{
left = new CiBinaryExpr {
Line = this.Line, Left = left, Op = NextToken(), Right = ParseMulExpr()
}
}
;
return(left);
}
CiExpr ParseShiftExpr()
{
CiExpr left = ParseAddExpr();
while (See(CiToken.ShiftLeft) || See(CiToken.ShiftRight))
{
left = new CiBinaryExpr {
Line = this.Line, Left = left, Op = NextToken(), Right = ParseAddExpr()
}
}
;
return(left);
}
CiExpr ParseRelExpr()
{
CiExpr left = ParseShiftExpr();
for (;;)
{
switch (this.CurrentToken)
{
case CiToken.Less:
case CiToken.LessOrEqual:
case CiToken.Greater:
case CiToken.GreaterOrEqual:
left = new CiBinaryExpr {
Line = this.Line, Left = left, Op = NextToken(), Right = ParseShiftExpr()
};
break;
default:
return(left);
}
}
}
CiExpr ParseEqualityExpr()
{
CiExpr left = ParseRelExpr();
while (See(CiToken.Equal) || See(CiToken.NotEqual))
{
left = new CiBinaryExpr {
Line = this.Line, Left = left, Op = NextToken(), Right = ParseRelExpr()
}
}
;
return(left);
}
CiExpr ParseAndExpr()
{
CiExpr left = ParseEqualityExpr();
while (See(CiToken.And))
{
left = new CiBinaryExpr {
Line = this.Line, Left = left, Op = NextToken(), Right = ParseEqualityExpr()
}
}
;
return(left);
}
CiExpr ParseXorExpr()
{
CiExpr left = ParseAndExpr();
while (See(CiToken.Xor))
{
left = new CiBinaryExpr {
Line = this.Line, Left = left, Op = NextToken(), Right = ParseAndExpr()
}
}
;
return(left);
}
CiExpr ParseOrExpr()
{
CiExpr left = ParseXorExpr();
while (See(CiToken.Or))
{
left = new CiBinaryExpr {
Line = this.Line, Left = left, Op = NextToken(), Right = ParseXorExpr()
}
}
;
return(left);
}
CiExpr ParseCondAndExpr()
{
CiExpr left = ParseOrExpr();
while (See(CiToken.CondAnd))
{
left = new CiBinaryExpr {
Line = this.Line, Left = left, Op = NextToken(), Right = ParseOrExpr()
}
}
;
return(left);
}
CiExpr ParseCondOrExpr()
{
CiExpr left = ParseCondAndExpr();
while (See(CiToken.CondOr))
{
left = new CiBinaryExpr {
Line = this.Line, Left = left, Op = NextToken(), Right = ParseCondAndExpr()
}
}
;
return(left);
}
CiExpr ParseExpr()
{
CiExpr left = ParseCondOrExpr();
if (See(CiToken.QuestionMark))
{
CiCondExpr result = new CiCondExpr {
Line = this.Line, Cond = left
};
NextToken();
result.OnTrue = ParseExpr();
Expect(CiToken.Colon);
result.OnFalse = ParseExpr();
return(result);
}
return(left);
}
CiExpr ParseType()
{
CiExpr left = ParseExpr();
if (Eat(CiToken.Range))
{
return new CiBinaryExpr {
Line = this.Line, Left = left, Op = CiToken.Range, Right = ParseExpr()
}
}
;
return(left);
}
CiExpr ParseAssign(bool allowVar)
{
CiExpr left = ParseType();
switch (this.CurrentToken)
{
case CiToken.Assign:
case CiToken.AddAssign:
case CiToken.SubAssign:
case CiToken.MulAssign:
case CiToken.DivAssign:
case CiToken.ModAssign:
case CiToken.AndAssign:
case CiToken.OrAssign:
case CiToken.XorAssign:
case CiToken.ShiftLeftAssign:
case CiToken.ShiftRightAssign:
return(new CiBinaryExpr {
Line = this.Line, Left = left, Op = NextToken(), Right = ParseAssign(false)
});
case CiToken.Id:
if (allowVar)
{
return(ParseVar(left));
}
return(left);
default:
return(left);
}
}
CiVar ParseVar(CiExpr type)
{
CiVar def = new CiVar {
Line = this.Line, TypeExpr = type, Name = ParseId()
};
if (Eat(CiToken.Assign))
{
def.Value = ParseAssign(false);
}
return(def);
}
CiVar ParseVar()
{
return(ParseVar(ParseType()));
}
CiConst ParseConst()
{
Expect(CiToken.Const);
CiConst konst = new CiConst {
Line = this.Line, TypeExpr = ParseType(), Name = ParseId()
};
Expect(CiToken.Assign);
konst.Value = ParseConstInitializer();
Expect(CiToken.Semicolon);
return(konst);
}
CiBlock ParseBlock()
{
int line = this.Line;
Expect(CiToken.LeftBrace);
List <CiStatement> statements = new List <CiStatement>();
while (!Eat(CiToken.RightBrace))
{
statements.Add(ParseStatement());
}
return(new CiBlock {
Filename = this.Filename, Line = this.Line, Statements = statements.ToArray()
});
}
CiBreak ParseBreak()
{
if (this.CurrentLoopOrSwitch == null)
{
throw ParseException("break outside loop or switch");
}
CiBreak result = new CiBreak(this.CurrentLoopOrSwitch)
{
Line = this.Line
};
Expect(CiToken.Break);
Expect(CiToken.Semicolon);
return(result);
}
CiContinue ParseContinue()
{
if (this.CurrentLoop == null)
{
throw ParseException("continue outside loop");
}
CiContinue result = new CiContinue(this.CurrentLoop)
{
Line = this.Line
};
Expect(CiToken.Continue);
Expect(CiToken.Semicolon);
return(result);
}
void ParseLoopBody(CiLoop loop)
{
CiLoop outerLoop = this.CurrentLoop;
CiCondCompletionStatement outerLoopOrSwitch = this.CurrentLoopOrSwitch;
this.CurrentLoopOrSwitch = this.CurrentLoop = loop;
loop.Body = ParseStatement();
this.CurrentLoopOrSwitch = outerLoopOrSwitch;
this.CurrentLoop = outerLoop;
}
CiDoWhile ParseDoWhile()
{
CiDoWhile result = new CiDoWhile {
Line = this.Line
};
Expect(CiToken.Do);
ParseLoopBody(result);
Expect(CiToken.While);
result.Cond = ParseParenthesized();
Expect(CiToken.Semicolon);
return(result);
}
CiFor ParseFor()
{
CiFor result = new CiFor {
Line = this.Line
};
Expect(CiToken.For);
Expect(CiToken.LeftParenthesis);
if (!See(CiToken.Semicolon))
{
result.Init = ParseAssign(true);
}
Expect(CiToken.Semicolon);
if (!See(CiToken.Semicolon))
{
result.Cond = ParseExpr();
}
Expect(CiToken.Semicolon);
if (!See(CiToken.RightParenthesis))
{
result.Advance = ParseAssign(false);
}
Expect(CiToken.RightParenthesis);
ParseLoopBody(result);
return(result);
}
CiForeach ParseForeach()
{
CiForeach result = new CiForeach {
Line = this.Line
};
Expect(CiToken.Foreach);
Expect(CiToken.LeftParenthesis);
result.Element = new CiVar {
Line = this.Line, TypeExpr = ParseType(), Name = ParseId()
};
Expect(CiToken.In);
result.Collection = ParseExpr();
Expect(CiToken.RightParenthesis);
ParseLoopBody(result);
return(result);
}
CiIf ParseIf()
{
CiIf result = new CiIf {
Line = this.Line
};
Expect(CiToken.If);
result.Cond = ParseParenthesized();
result.OnTrue = ParseStatement();
if (Eat(CiToken.Else))
{
result.OnFalse = ParseStatement();
}
return(result);
}
CiNative ParseNative()
{
int line = this.Line;
Expect(CiToken.Native);
StringBuilder sb = new StringBuilder();
this.CopyTo = sb;
try {
Expect(CiToken.LeftBrace);
int nesting = 1;
for (;;)
{
if (See(CiToken.EndOfFile))
{
throw ParseException("Native block not terminated");
}
if (See(CiToken.LeftBrace))
{
nesting++;
}
else if (See(CiToken.RightBrace) && --nesting == 0)
{
break;
}
NextToken();
}
}
finally {
this.CopyTo = null;
}
NextToken();
Trace.Assert(sb[sb.Length - 1] == '}');
sb.Length--;
return(new CiNative {
Line = line, Content = sb.ToString()
});
}
CiReturn ParseReturn()
{
CiReturn result = new CiReturn {
Line = this.Line
};
NextToken();
if (!See(CiToken.Semicolon))
{
result.Value = ParseExpr();
}
Expect(CiToken.Semicolon);
return(result);
}
CiSwitch ParseSwitch()
{
CiSwitch result = new CiSwitch {
Line = this.Line
};
Expect(CiToken.Switch);
result.Value = ParseParenthesized();
Expect(CiToken.LeftBrace);
CiCondCompletionStatement outerLoopOrSwitch = this.CurrentLoopOrSwitch;
this.CurrentLoopOrSwitch = result;
List <CiCase> cases = new List <CiCase>();
while (Eat(CiToken.Case))
{
List <CiExpr> values = new List <CiExpr>();
CiExpr value;
do
{
value = ParseExpr();
values.Add(value);
Expect(CiToken.Colon);
} while (Eat(CiToken.Case));
if (See(CiToken.Default))
{
throw StatementException(value, "Please remove case before default");
}
CiCase kase = new CiCase {
Values = values.ToArray()
};
List <CiStatement> statements = new List <CiStatement>();
for (;;)
{
statements.Add(ParseStatement());
switch (this.CurrentToken)
{
case CiToken.Case:
case CiToken.Default:
case CiToken.RightBrace:
break;
case CiToken.Goto:
NextToken();
switch (this.CurrentToken)
{
case CiToken.Case:
NextToken();
kase.Fallthrough = ParseExpr();
break;
case CiToken.Default:
kase.Fallthrough = new CiGotoDefault {
Line = this.Line
};
NextToken();
break;
default:
throw ParseException("Expected goto case or goto default");
}
Expect(CiToken.Semicolon);
break;
default:
continue;
}
break;
}
kase.Body = statements.ToArray();
cases.Add(kase);
}
if (cases.Count == 0)
{
throw ParseException("Switch with no cases");
}
result.Cases = cases.ToArray();
if (Eat(CiToken.Default))
{
Expect(CiToken.Colon);
List <CiStatement> statements = new List <CiStatement>();
do
{
statements.Add(ParseStatement());
}while (!See(CiToken.RightBrace));
result.DefaultBody = statements.ToArray();
}
Expect(CiToken.RightBrace);
this.CurrentLoopOrSwitch = outerLoopOrSwitch;
return(result);
}
CiThrow ParseThrow()
{
CiThrow result = new CiThrow {
Line = this.Line
};
Expect(CiToken.Throw);
result.Message = ParseExpr();
Expect(CiToken.Semicolon);
return(result);
}
CiWhile ParseWhile()
{
CiWhile result = new CiWhile {
Line = this.Line
};
Expect(CiToken.While);
result.Cond = ParseParenthesized();
ParseLoopBody(result);
return(result);
}
CiStatement ParseStatement()
{
switch (this.CurrentToken)
{
case CiToken.LeftBrace:
return(ParseBlock());
case CiToken.Break:
return(ParseBreak());
case CiToken.Const:
return(ParseConst());
case CiToken.Continue:
return(ParseContinue());
case CiToken.Do:
return(ParseDoWhile());
case CiToken.For:
return(ParseFor());
case CiToken.Foreach:
return(ParseForeach());
case CiToken.If:
return(ParseIf());
case CiToken.Native:
return(ParseNative());
case CiToken.Return:
return(ParseReturn());
case CiToken.Switch:
return(ParseSwitch());
case CiToken.Throw:
return(ParseThrow());
case CiToken.While:
return(ParseWhile());
default:
CiExpr expr = ParseAssign(true);
Expect(CiToken.Semicolon);
return(expr);
}
}
CiCallType ParseCallType()
{
switch (this.CurrentToken)
{
case CiToken.Static:
NextToken();
return(CiCallType.Static);
case CiToken.Abstract:
NextToken();
return(CiCallType.Abstract);
case CiToken.Virtual:
NextToken();
return(CiCallType.Virtual);
case CiToken.Override:
NextToken();
return(CiCallType.Override);
case CiToken.Sealed:
NextToken();
return(CiCallType.Sealed);
default:
return(CiCallType.Normal);
}
}
void ParseMethod(CiMethod method)
{
method.IsMutator = Eat(CiToken.ExclamationMark);
method.Parameters.Filename = this.Filename;
Expect(CiToken.LeftParenthesis);
if (!See(CiToken.RightParenthesis))
{
do
{
CiCodeDoc doc = ParseDoc();
CiVar param = ParseVar();
param.Documentation = doc;
method.Parameters.Add(param);
} while (Eat(CiToken.Comma));
}
Expect(CiToken.RightParenthesis);
method.Throws = Eat(CiToken.Throws);
if (method.CallType == CiCallType.Abstract)
{
Expect(CiToken.Semicolon);
}
else if (See(CiToken.FatArrow))
{
method.Body = ParseReturn();
}
else
{
method.Body = ParseBlock();
}
}
public CiClass ParseClass(CiCallType callType)
{
Expect(CiToken.Class);
CiClass klass = new CiClass {
Parent = this.Program, Filename = this.Filename, Line = this.Line, CallType = callType, Name = ParseId()
};
if (Eat(CiToken.Colon))
{
klass.BaseClassName = ParseId();
}
Expect(CiToken.LeftBrace);
List <CiConst> consts = new List <CiConst>();
List <CiField> fields = new List <CiField>();
List <CiMethod> methods = new List <CiMethod>();
while (!Eat(CiToken.RightBrace))
{
CiCodeDoc doc = ParseDoc();
CiVisibility visibility;
switch (this.CurrentToken)
{
case CiToken.Internal:
visibility = CiVisibility.Internal;
NextToken();
break;
case CiToken.Protected:
visibility = CiVisibility.Protected;
NextToken();
break;
case CiToken.Public:
visibility = CiVisibility.Public;
NextToken();
break;
default:
visibility = CiVisibility.Private;
break;
}
if (See(CiToken.Const))
{
// const
CiConst konst = ParseConst();
konst.Documentation = doc;
konst.Visibility = visibility;
consts.Add(konst);
continue;
}
callType = ParseCallType();
// \ class | static | normal | abstract | sealed
// method \| | | |
// --------+--------+--------+----------+-------
// static | + | + | + | +
// normal | - | + | + | +
// abstract| - | - | + | -
// virtual | - | + | + | -
// override| - | + | + | +
// sealed | - | + | + | +
if (callType == CiCallType.Static || klass.CallType == CiCallType.Abstract)
{
// ok
}
else if (klass.CallType == CiCallType.Static)
{
throw ParseException("Only static members allowed in a static class");
}
else if (callType == CiCallType.Abstract)
{
throw ParseException("Abstract methods allowed only in an abstract class");
}
else if (klass.CallType == CiCallType.Sealed && callType == CiCallType.Virtual)
{
throw ParseException("Virtual methods disallowed in a sealed class");
}
if (visibility == CiVisibility.Private && callType != CiCallType.Static && callType != CiCallType.Normal)
{
throw ParseException("{0} method cannot be private", callType);
}
CiExpr type = Eat(CiToken.Void) ? null : ParseType();
if (See(CiToken.LeftBrace) &&
type is CiBinaryExpr call &&
call.Op == CiToken.LeftParenthesis &&
call.Left is CiSymbolReference sr)
{
// constructor
if (sr.Name != klass.Name)
{
throw ParseException("Constructor name doesn't match class name");
}
if (callType != CiCallType.Normal)
{
throw ParseException("Constructor cannot be {0}", callType);
}
if (call.RightCollection.Length != 0)
{
throw ParseException("Constructor parameters not supported");
}
if (klass.Constructor != null)
{
throw ParseException("Duplicate constructor, already defined in line {0}", klass.Constructor.Line);
}
if (visibility == CiVisibility.Private)
{
visibility = CiVisibility.Internal; // TODO
}
klass.Constructor = new CiMethodBase {
Line = sr.Line, Documentation = doc, Visibility = visibility, Parent = klass, Name = klass.Name, Body = ParseBlock()
};
continue;
}
int line = this.Line;
string name = ParseId();
if (See(CiToken.LeftParenthesis) || See(CiToken.ExclamationMark))
{
// method
CiMethod method = new CiMethod {
Line = line, Documentation = doc, Visibility = visibility, CallType = callType, TypeExpr = type, Name = name
};
method.Parameters.Parent = klass;
ParseMethod(method);
methods.Add(method);
continue;
}
// field
if (visibility == CiVisibility.Public)
{
throw ParseException("Field cannot be public");
}
if (callType != CiCallType.Normal)
{
throw ParseException("Field cannot be {0}", callType);
}
if (type == null)
{
throw ParseException("Field cannot be void");
}
CiField field = new CiField {
Line = line, Documentation = doc, Visibility = visibility, TypeExpr = type, Name = name
};
if (Eat(CiToken.Assign))
{
field.Value = ParseExpr();
}
Expect(CiToken.Semicolon);
fields.Add(field);
}
klass.Consts = consts.ToArray();
klass.Fields = fields.ToArray();
klass.Methods = methods.ToArray();
return(klass);
}
public CiEnum ParseEnum()
{
Expect(CiToken.Enum);
CiEnum enu = new CiEnum {
Parent = this.Program, Filename = this.Filename, IsFlags = Eat(CiToken.Asterisk), Line = this.Line, Name = ParseId()
};
Expect(CiToken.LeftBrace);
do
{
CiConst konst = new CiConst {
Documentation = ParseDoc(), Line = this.Line, Name = ParseId(), Type = enu
};
if (Eat(CiToken.Assign))
{
konst.Value = ParseExpr();
}
else if (enu.IsFlags)
{
throw ParseException("enum* symbol must be assigned a value");
}
enu.Add(konst);
} while (Eat(CiToken.Comma));
Expect(CiToken.RightBrace);
return(enu);
}
public void Parse(string filename, TextReader reader)
{
Open(filename, reader);
while (!See(CiToken.EndOfFile))
{
CiCodeDoc doc = ParseDoc();
CiContainerType type;
bool isPublic = Eat(CiToken.Public);
switch (this.CurrentToken)
{
// class
case CiToken.Class:
type = ParseClass(CiCallType.Normal);
break;
case CiToken.Static:
case CiToken.Abstract:
case CiToken.Sealed:
type = ParseClass(ParseCallType());
break;
// enum
case CiToken.Enum:
type = ParseEnum();
break;
// native
case CiToken.Native:
this.Program.TopLevelNatives.Add(ParseNative().Content);
continue;
default:
throw ParseException("Expected class or enum");
}
type.Documentation = doc;
type.IsPublic = isPublic;
this.Program.Add(type);
}
}
}
}