public override CiExpr Visit(CiLiteral expr, CiPriority parent)
{
WriteLiteral(expr.Value);
return(expr);
}
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);
}
}
}
}
CiExpr ParsePrimaryExpr()
{
CiExpr result;
switch (this.CurrentToken)
{
case CiToken.Increment:
case CiToken.Decrement:
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.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:
result = new CiBinaryExpr {
Line = this.Line, Left = result, Op = NextToken(), Right = 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:
case CiToken.ExclamationMark:
case CiToken.Hash:
result = new CiPostfixExpr {
Line = this.Line, Inner = result, Op = NextToken()
};
break;
default:
return(result);
}
}
}
public abstract CiExpr Visit(CiLiteral expr, CiPriority parent);