public override IRppExpr RewriteCaseClause(RppMember inVar, RppMember outOut, IRppExpr thenExpr, RppMatchingContext ctx)
{
if (Name == "_")
{
return Block(Assign(outOut, thenExpr), Break);
}
throw new NotImplementedException();
}
public override IRppNode Analyze(SymbolTable scope, Diagnostic diagnostic)
{
Condition = (IRppExpr) Condition.Analyze(scope, diagnostic);
ThenExpr = (IRppExpr) ThenExpr.Analyze(scope, diagnostic);
ElseExpr = (IRppExpr) ElseExpr.Analyze(scope, diagnostic);
Type = ThenExpr.Type;
return this;
}
/// <summary>
/// So we have pattern like this:
/// case [Pattern] => [Expr]
/// we need to figure out type of [Expr] but it can depend on variables spawned in
/// [Pattern], so we need to get thise variables (see RppMatchPattern.DeclareVariables())
/// and add them to the scope and then anaylize [Expr]
/// </summary>
public override IRppNode Analyze(SymbolTable scope, Diagnostic diagnostic)
{
Pattern = (RppMatchPattern) Pattern.Analyze(scope, diagnostic);
SymbolTable localScope = new SymbolTable(scope);
RType inputType = GetInputType(localScope);
IEnumerable<IRppExpr> locals = Pattern.DeclareVariables(inputType);
NodeUtils.Analyze(localScope, locals, diagnostic);
Expr = (IRppExpr) Expr.Analyze(localScope, diagnostic);
return this;
}
private IRppExpr ProcessCases(RppMember inVar, RppMember outOut, IRppExpr thenExpr, RppMatchingContext ctx, string localOptionVar, int patternIndex)
{
if (patternIndex >= _patterns.Length)
{
List<IRppNode> nodes = new List<IRppNode>();
// Binding to a variable if it exists varid@Foo...
if (BindedVariableToken != null)
{
var varId = Val(BindedVariableToken, _type.Value, inVar);
nodes.Add(varId);
}
nodes.Add(thenExpr);
nodes.Add(Break);
return Block(nodes);
}
IRppExpr classParamValue = GetClassParam(localOptionVar, patternIndex, _patterns.Length);
RppMatchPattern pattern = _patterns[patternIndex];
int nextPatternIndex = patternIndex + 1;
if (pattern is RppLiteralPattern)
{
RppLiteralPattern literalPattern = (RppLiteralPattern) pattern;
return If(BinOp("==", literalPattern.Literal, classParamValue), ProcessCases(inVar, outOut, thenExpr, ctx, localOptionVar, nextPatternIndex));
}
RType classParamType = _classParamTypes[patternIndex];
if (pattern is RppVariablePattern)
{
RType patternType = classParamType;
RppVar var = Val(pattern.Token.Text, patternType, classParamValue);
var.Token = pattern.Token;
return Block(var, ProcessCases(inVar, outOut, thenExpr, ctx, localOptionVar, nextPatternIndex));
}
if (pattern is RppConstructorPattern)
{
RppConstructorPattern constructorPattern = (RppConstructorPattern) pattern;
string classParamArg = ctx.CreateLocal(classParamType.Name);
RppVar classParamArgVar = Val(classParamArg, classParamType, classParamValue);
RppId classParamInput = StaticId(classParamArgVar);
IRppExpr nextPattern = ProcessCases(inVar, outOut, thenExpr, ctx, localOptionVar, nextPatternIndex);
return Block(classParamArgVar, constructorPattern.MatchInstance(classParamInput, outOut, nextPattern, ctx));
}
return ProcessCases(inVar, outOut, thenExpr, ctx, localOptionVar, nextPatternIndex);
}
private IRppExpr MatchInstance(RppMember inVar, RppMember outOut, IRppExpr thenExpr, RppMatchingContext ctx)
{
// If type of input variable do not match pattern type, we need to cast it
if (!inVar.Type.Equals(_type))
{
string localVar = ctx.CreateLocal(_type.Name.Name);
var castedVariable = Val(localVar, _type.Value, new RppAsInstanceOf(inVar, _type));
return If(BinOp("!=", new RppAsInstanceOf(inVar, _type), NullTy), Block(castedVariable, ProcessMatchExpr(Id(localVar), outOut, thenExpr, ctx)));
}
return ProcessMatchExpr(inVar, outOut, thenExpr, ctx);
}
public static IRppExpr CastIfNeeded(IRppExpr sourceExpr, RType targetType)
{
RType sourceType = sourceExpr.Type.Value;
if (sourceType.Equals(targetType))
{
return sourceExpr;
}
if (sourceType.IsPrimitive && targetType == RppTypeSystem.AnyTy)
{
return new RppBox(sourceExpr);
}
/*
if (sourceType.IsValueType && targetType == typeof (object))
{
return new RppBox(sourceExpr);
}
if (IsAssignable(sourceExpr.Type.Runtime, targetType))
{
return sourceExpr;
}
if (sourceExpr.Type.Runtime.IsSubclassOf(targetType))
{
return sourceExpr;
}
*/
if (sourceType.IsSubclassOf(targetType))
{
return sourceExpr;
}
if (targetType.IsClass && sourceType == RppTypeSystem.NullTy)
{
return sourceExpr;
}
if (sourceType == RppTypeSystem.NothingTy)
{
return sourceExpr;
}
throw new Exception("Can't cast expression to a specific type");
}
public override IRppNode Analyze(SymbolTable scope, Diagnostic diagnostic)
{
Value = (IRppExpr) Value.Analyze(scope, diagnostic);
RppVar declIn = new RppVar(MutabilityFlag.MfVal, "<in>", Value.Type, Value);
declIn.Analyze(scope, diagnostic);
CaseClauses = NodeUtils.Analyze(scope, CaseClauses, diagnostic);
Type = CheckCommonType(CaseClauses, Token).AsResolvable();
RppVar declOut = new RppVar(MutabilityFlag.MfVar, "<out>", Type, new RppDefaultExpr(Type));
RppId declInId = new RppId("<in>", declIn);
declInId.Analyze(scope, diagnostic);
RppId declOutId = new RppId("<out>", declOut);
RppMatchingContext ctx = new RppMatchingContext();
var ifC = Create(declInId, declOutId, CaseClauses, ctx);
var expr = new RppBlockExpr(List<IRppNode>(declIn, ifC)) {Exitable = true};
SymbolTable matchScope = new SymbolTable(scope);
RppBlockExpr matchBlock = new RppBlockExpr(List<IRppNode>(declOut, expr, declOutId));
return matchBlock.Analyze(matchScope, diagnostic);
}
public RppAsInstanceOf(IRppExpr value, ResolvableType type)
{
Value = value;
Type = type;
}
private static RType ResolveType(IRppExpr param)
{
return param.Type.Value;
}
public RppCaseClause([NotNull] RppMatchPattern pattern, [NotNull] IRppExpr expr)
{
Pattern = pattern;
Expr = expr;
}
public abstract IRppExpr RewriteCaseClause(RppMember inVar, RppMember outOut, IRppExpr thenExpr, RppMatchingContext ctx);
private static RppSelector CallSetter(IRppExpr target, RppFieldInfo field, IRppExpr value)
{
return new RppSelector(target, new RppFuncCall(field.SetterName, List(value)));
}
public RppIf([NotNull] IRppExpr condition, [NotNull] IRppExpr thenExpr, [NotNull] IRppExpr elseExpr)
{
Condition = condition;
ThenExpr = thenExpr;
ElseExpr = elseExpr;
}
private static RppBinOp Eq(IRppExpr left, IRppExpr right)
{
return RppBinOp.Create("==", left, right);
}
private static RppBinOp Sub(IRppExpr left, IRppExpr right)
{
return RppBinOp.Create("-", left, right);
}
public RppLiteralPattern([NotNull] IRppExpr literal)
{
Literal = literal;
}
private static RppBinOp LogicalOr(IRppExpr left, IRppExpr right)
{
return RppBinOp.Create("||", left, right);
}
public override IRppExpr RewriteCaseClause(RppMember inVar, RppMember outOut, IRppExpr thenExpr, RppMatchingContext ctx)
{
return If(BinOp("==", inVar, Literal), Block(Assign(outOut, thenExpr), Break));
}
public RppWhile(IRppExpr condition, IRppNode body)
{
Condition = condition;
Body = body;
Type = ResolvableType.UnitTy;
}
private IRppExpr ProcessMatchExpr(RppMember inVar, RppMember outOut, IRppExpr thenExpr, RppMatchingContext ctx)
{
string localOptionVar = ctx.CreateLocalOption();
RppVar localOption = Val(localOptionVar, _unapplyMethod.ReturnType, CallMethod(_type.Value.Name, _unapplyMethod.Name, inVar));
return Block(localOption, If(GetIsValidExpression(localOption), ProcessCases(inVar, outOut, thenExpr, ctx, localOptionVar, 0)));
}
private static void TestExpr(string code, IRppExpr expected)
{
var parser = ParserTest.CreateParser(code);
IRppExpr expr = parser.ParseExpr();
Assert.AreEqual(expected, expr);
}
public static RppIf If(IRppExpr condition, IRppExpr thenExpr, IRppExpr elseExpr)
{
return new RppIf(condition, thenExpr, elseExpr);
}
private static RppBinOp Add(IRppExpr left, IRppExpr right)
{
return RppBinOp.Create("+", left, right);
}
public RppField(MutabilityFlag mutabilityFlag, string name, HashSet<ObjectModifier> modifiers, ResolvableType type, IRppExpr initExpr)
: base(mutabilityFlag, name, type, initExpr)
{
Modifiers = modifiers;
IsLocalSemantic = false;
}
private static RppBinOp Mult(IRppExpr left, IRppExpr right)
{
return RppBinOp.Create("*", left, right);
}
public override IRppExpr RewriteCaseClause(RppMember inVar, RppMember outOut, IRppExpr thenExpr, RppMatchingContext ctx)
{
return MatchInstance(inVar, outOut, Assign(outOut, thenExpr), ctx);
}
private static RppUnary Not(IRppExpr expr)
{
return new RppUnary("!", expr);
}
public RppMatch(IRppExpr value, [NotNull] IEnumerable<RppCaseClause> caseClauses)
{
Value = value;
CaseClauses = caseClauses;
}
private static RppSelector Selector(IRppExpr expr, RppMember member)
{
return new RppSelector(expr, member);
}
public static RppIf If(IRppExpr condition, IRppExpr thenExpr)
{
return If(condition, thenExpr, RppEmptyExpr.Instance);
}