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GenSwift.fu
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GenSwift.fu
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// GenSwift.fu - Swift code generator
//
// Copyright (C) 2020-2024 Piotr Fusik
//
// This file is part of Fusion Transpiler,
// see https://github.com/fusionlanguage/fut
//
// Fusion Transpiler is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Fusion Transpiler is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Fusion Transpiler. If not, see http://www.gnu.org/licenses/
public class GenSwift : GenPySwift
{
FuSystem System;
bool ThrowException;
bool ArrayRef;
bool StringCharAt;
bool StringIndexOf;
bool StringSubstring;
List<HashSet<string>()>() VarsAtIndent;
List<bool>() VarBytesAtIndent;
protected override string GetTargetName() => "Swift";
protected override void StartDocLine!()
{
Write("/// ");
}
protected override void WriteDocCode!(string s)
{
Write(s == "null" ? "nil" : s);
}
protected override string GetDocBullet() => "/// * ";
protected override void WriteDoc!(FuCodeDoc? doc)
{
if (doc != null)
WriteContent(doc);
}
void WriteCamelCaseNotKeyword!(string name)
{
switch (name) {
case "this":
Write("self");
break;
case "As":
case "Associatedtype":
case "Await":
case "Break":
case "Case":
case "Catch":
case "Class":
case "Continue":
case "Default":
case "Defer":
case "Deinit":
case "Do":
case "Else":
case "Enum":
case "Extension":
case "Fallthrough":
case "False":
case "Fileprivate":
case "For":
case "Foreach":
case "Func":
case "Guard":
case "If":
case "Import":
case "In":
case "Init":
case "Inout":
case "Int":
case "Internal":
case "Is":
case "Let":
case "Nil":
case "Operator":
case "Private":
case "Protocol":
case "Public":
case "Repeat":
case "Rethrows":
case "Return":
case "Self":
case "Static":
case "Struct":
case "Switch":
case "Subscript":
case "Super":
case "Throw":
case "Throws":
case "True":
case "Try":
case "Typealias":
case "Var":
case "Void":
case "Where":
case "While":
case "as":
case "associatedtype":
case "await":
case "catch":
case "defer":
case "deinit":
case "extension":
case "fallthrough":
case "fileprivate":
case "func":
case "guard":
case "import":
case "init":
case "inout":
case "is":
case "let":
case "nil":
case "operator":
case "private":
case "protocol":
case "repeat":
case "rethrows":
case "self":
case "struct":
case "subscript":
case "super":
case "try":
case "typealias":
case "var":
case "where":
WriteCamelCase(name);
WriteChar('_');
break;
default:
WriteCamelCase(name);
break;
}
}
protected override void WriteName!(FuSymbol symbol)
{
switch (symbol) {
case FuContainerType:
Write(symbol.Name);
break;
case FuConst konst when konst.InMethod != null:
WriteCamelCase(konst.InMethod.Name);
WritePascalCase(symbol.Name);
if (konst.InMethodIndex > 0)
VisitLiteralLong(konst.InMethodIndex);
break;
case FuVar:
case FuMember:
WriteCamelCaseNotKeyword(symbol.Name);
break;
default:
assert false;
}
}
protected override void WriteLocalName!(FuSymbol symbol, FuPriority parent)
{
if (symbol.Parent is FuForeach forEach && forEach.Collection.Type is FuStringType) {
Write("Int(");
WriteCamelCaseNotKeyword(symbol.Name);
Write(".value)");
}
else
base.WriteLocalName(symbol, parent);
}
protected override void WriteMemberOp!(FuExpr left, FuSymbolReference? symbol)
{
if (left.Type != null && left.Type.Nullable)
WriteChar('!');
WriteChar('.');
}
void OpenIndexing!(FuExpr collection)
{
collection.Accept(this, FuPriority.Primary);
if (collection.Type.Nullable)
WriteChar('!');
WriteChar('[');
}
static bool IsArrayRef(FuArrayStorageType array) => array.PtrTaken || array.GetElementType() is FuStorageType;
void WriteClassName!(FuClassType klass)
{
switch (klass.Class.Id) {
case FuId.StringClass:
Write("String");
break;
case FuId.ArrayPtrClass:
this.ArrayRef = true;
Write("ArrayRef<");
WriteType(klass.GetElementType());
WriteChar('>');
break;
case FuId.ArrayStorageClass: // Main(string[] args)
case FuId.ListClass:
case FuId.QueueClass:
case FuId.StackClass:
WriteChar('[');
WriteType(klass.GetElementType());
WriteChar(']');
break;
case FuId.HashSetClass:
case FuId.SortedSetClass:
Write("Set<");
WriteType(klass.GetElementType());
WriteChar('>');
break;
case FuId.DictionaryClass:
case FuId.SortedDictionaryClass:
WriteChar('[');
WriteType(klass.GetKeyType());
Write(": ");
WriteType(klass.GetValueType());
WriteChar(']');
break;
case FuId.OrderedDictionaryClass:
NotSupported(klass, "OrderedDictionary");
break;
case FuId.JsonElementClass:
Write("Any");
break;
case FuId.LockClass:
Include("Foundation");
Write("NSRecursiveLock");
break;
default:
Write(klass.Class.Name);
break;
}
}
void WriteType!(FuType type)
{
switch (type) {
case FuNumericType:
switch (type.Id) {
case FuId.SByteRange:
Write("Int8");
break;
case FuId.ByteRange:
Write("UInt8");
break;
case FuId.ShortRange:
Write("Int16");
break;
case FuId.UShortRange:
Write("UInt16");
break;
case FuId.IntType:
case FuId.NIntType:
Write("Int");
break;
case FuId.LongType:
Write("Int64");
break;
case FuId.FloatType:
Write("Float");
break;
case FuId.DoubleType:
Write("Double");
break;
default:
assert false;
}
break;
case FuEnum:
Write(type.Id == FuId.BoolType ? "Bool" : type.Name);
break;
case FuArrayStorageType arrayStg:
if (IsArrayRef(arrayStg)) {
this.ArrayRef = true;
Write("ArrayRef<");
WriteType(arrayStg.GetElementType());
WriteChar('>');
}
else {
WriteChar('[');
WriteType(arrayStg.GetElementType());
WriteChar(']');
}
break;
case FuClassType klass:
WriteClassName(klass);
if (klass.Nullable)
WriteChar('?');
break;
default:
assert false;
}
}
protected override void WriteTypeAndName!(FuNamedValue value)
{
WriteName(value);
if (!value.Type.IsFinal() || value.IsAssignableStorage()) {
Write(" : ");
WriteType(value.Type);
}
}
internal override void VisitLiteralNull!()
{
Write("nil");
}
void WriteUnwrapped!(FuExpr expr, FuPriority parent, bool substringOk)
{
if (expr.Type.Nullable) {
expr.Accept(this, FuPriority.Primary);
WriteChar('!');
}
else if (!substringOk && expr is FuCallExpr call && call.Method.Symbol.Id == FuId.StringSubstring)
WriteCall("String", expr);
else
expr.Accept(this, parent);
}
internal override void VisitInterpolatedString!(FuInterpolatedString expr, FuPriority parent)
{
if (expr.Parts.Any(part => part.WidthExpr != null || part.Format != ' ' || part.Precision >= 0)) {
Include("Foundation");
Write("String(format: ");
WritePrintf(expr, false);
}
else {
WriteChar('"');
foreach (FuInterpolatedPart part in expr.Parts) {
Write(part.Prefix);
Write("\\(");
WriteUnwrapped(part.Argument, FuPriority.Argument, true);
WriteChar(')');
}
Write(expr.Suffix);
WriteChar('"');
}
}
protected override void WriteCoercedInternal!(FuType type, FuExpr expr, FuPriority parent)
{
if (type is FuNumericType && !(expr is FuLiteral)
&& GetTypeId(type, false) != GetTypeId(expr.Type, expr is FuBinaryExpr binary && binary.Op != FuToken.LeftBracket)) {
WriteType(type);
WriteChar('(');
if (type is FuIntegerType && expr is FuCallExpr call && call.Method.Symbol.Id == FuId.MathTruncate)
call.Arguments[0].Accept(this, FuPriority.Argument);
else
expr.Accept(this, FuPriority.Argument);
WriteChar(')');
}
else if (!type.Nullable)
WriteUnwrapped(expr, parent, false);
else
expr.Accept(this, parent);
}
protected override void WriteStringLength!(FuExpr expr)
{
WriteUnwrapped(expr, FuPriority.Primary, true);
Write(".count");
}
protected override void WriteArrayLength!(FuExpr expr, FuPriority parent)
{
WritePostfix(expr, ".count");
}
protected override void WriteCharAt!(FuBinaryExpr expr)
{
this.StringCharAt = true;
Write("fuStringCharAt(");
WriteUnwrapped(expr.Left, FuPriority.Argument, false);
Write(", ");
expr.Right.Accept(this, FuPriority.Argument);
WriteChar(')');
}
internal override void VisitSymbolReference!(FuSymbolReference expr, FuPriority parent)
{
switch (expr.Symbol.Id) {
case FuId.MathNaN:
Write("Float.nan");
break;
case FuId.MathNegativeInfinity:
Write("-Float.infinity");
break;
case FuId.MathPositiveInfinity:
Write("Float.infinity");
break;
default:
base.VisitSymbolReference(expr, parent);
break;
}
}
protected override string GetReferenceEqOp(bool not) => not ? " !== " : " === ";
void WriteStringContains!(FuExpr obj, string name, List<FuExpr#> args)
{
WriteUnwrapped(obj, FuPriority.Primary, true);
WriteChar('.');
Write(name);
WriteChar('(');
WriteUnwrapped(args[0], FuPriority.Argument, true);
WriteChar(')');
}
void WriteRange!(FuExpr startIndex, FuExpr length)
{
WriteCoerced(this.System.IntType, startIndex, FuPriority.Shift);
Write("..<");
WriteAdd(startIndex, length); // FIXME: side effect
}
bool AddVar!(string name)
{
HashSet<string>! vars = this.VarsAtIndent[this.Indent];
if (vars.Contains(name))
return false;
vars.Add(name);
return true;
}
void WriteJsonElementIs!(FuExpr obj, string name, FuPriority parent)
{
if (parent > FuPriority.Equality)
WriteChar('(');
obj.Accept(this, FuPriority.Equality);
Write(" is ");
Write(name);
if (parent > FuPriority.Equality)
WriteChar(')');
}
protected override void WriteCallExpr!(FuExpr? obj, FuMethod method, List<FuExpr#> args, FuPriority parent)
{
switch (method.Id) {
case FuId.None:
case FuId.ArrayContains:
case FuId.ListContains:
case FuId.ListSortAll:
case FuId.HashSetContains:
case FuId.HashSetRemove:
case FuId.SortedSetContains:
case FuId.SortedSetRemove:
if (obj == null) {
if (method.IsStatic()) {
WriteName(this.CurrentMethod.Parent);
WriteChar('.');
}
}
else if (IsReferenceTo(obj, FuId.BasePtr))
Write("super.");
else {
obj.Accept(this, FuPriority.Primary);
WriteMemberOp(obj, null);
}
WriteName(method);
WriteCoercedArgsInParentheses(method, args);
break;
case FuId.ClassToString:
obj.Accept(this, FuPriority.Primary);
WriteMemberOp(obj, null);
Write("description");
break;
case FuId.EnumFromInt:
Write(method.Type.Name);
Write("(rawValue: ");
args[0].Accept(this, FuPriority.Argument);
WriteChar(')');
break;
case FuId.EnumHasFlag:
WriteMethodCall(obj, "contains", args[0]);
break;
case FuId.StringContains:
WriteStringContains(obj, "contains", args);
break;
case FuId.StringEndsWith:
WriteStringContains(obj, "hasSuffix", args);
break;
case FuId.StringIndexOf:
Include("Foundation");
this.StringIndexOf = true;
Write("fuStringIndexOf(");
WriteUnwrapped(obj, FuPriority.Argument, true);
Write(", ");
WriteUnwrapped(args[0], FuPriority.Argument, true);
WriteChar(')');
break;
case FuId.StringLastIndexOf:
Include("Foundation");
this.StringIndexOf = true;
Write("fuStringIndexOf(");
WriteUnwrapped(obj, FuPriority.Argument, true);
Write(", ");
WriteUnwrapped(args[0], FuPriority.Argument, true);
Write(", .backwards)");
break;
case FuId.StringReplace:
WriteUnwrapped(obj, FuPriority.Primary, true);
Write(".replacingOccurrences(of: ");
WriteUnwrapped(args[0], FuPriority.Argument, true);
Write(", with: ");
WriteUnwrapped(args[1], FuPriority.Argument, true);
WriteChar(')');
break;
case FuId.StringStartsWith:
WriteStringContains(obj, "hasPrefix", args);
break;
case FuId.StringSubstring:
if (args[0].IsLiteralZero())
WriteUnwrapped(obj, FuPriority.Primary, true);
else {
this.StringSubstring = true;
Write("fuStringSubstring(");
WriteUnwrapped(obj, FuPriority.Argument, false);
Write(", ");
WriteCoerced(this.System.IntType, args[0], FuPriority.Argument);
WriteChar(')');
}
if (args.Count == 2) {
Write(".prefix(");
WriteCoerced(this.System.IntType, args[1], FuPriority.Argument);
WriteChar(')');
}
break;
case FuId.StringToLower:
WritePostfix(obj, ".lowercased()");
break;
case FuId.StringToUpper:
WritePostfix(obj, ".uppercased()");
break;
case FuId.ArrayCopyTo:
case FuId.ListCopyTo:
OpenIndexing(args[1]);
WriteRange(args[2], args[3]);
Write("] = ");
OpenIndexing(obj);
WriteRange(args[0], args[3]);
WriteChar(']');
break;
case FuId.ArrayFillAll:
obj.Accept(this, FuPriority.Assign);
if (obj.Type is FuArrayStorageType array && !IsArrayRef(array)) {
Write(" = [");
WriteType(array.GetElementType());
Write("](repeating: ");
WriteCoerced(array.GetElementType(), args[0], FuPriority.Argument);
Write(", count: ");
VisitLiteralLong(array.Length);
WriteChar(')');
}
else {
Write(".fill");
WriteCoercedArgsInParentheses(method, args);
}
break;
case FuId.ArrayFillPart:
if (obj.Type is FuArrayStorageType array2 && !IsArrayRef(array2)) {
OpenIndexing(obj);
WriteRange(args[1], args[2]);
Write("] = ArraySlice(repeating: ");
WriteCoerced(array2.GetElementType(), args[0], FuPriority.Argument);
Write(", count: ");
WriteCoerced(this.System.IntType, args[2], FuPriority.Argument); // FIXME: side effect
WriteChar(')');
}
else {
obj.Accept(this, FuPriority.Primary);
WriteMemberOp(obj, null);
Write("fill");
WriteCoercedArgsInParentheses(method, args);
}
break;
case FuId.ArraySortAll:
WritePostfix(obj, "[0..<");
assert obj.Type is FuArrayStorageType array3;
VisitLiteralLong(array3.Length);
Write("].sort()");
break;
case FuId.ArraySortPart:
case FuId.ListSortPart:
OpenIndexing(obj);
WriteRange(args[0], args[1]);
Write("].sort()");
break;
case FuId.ListAdd:
case FuId.QueueEnqueue:
case FuId.StackPush:
WriteListAppend(obj, args);
break;
case FuId.ListAddRange:
obj.Accept(this, FuPriority.Assign);
Write(" += ");
args[0].Accept(this, FuPriority.Argument);
break;
case FuId.ListAll:
WritePostfix(obj, ".allSatisfy ");
args[0].Accept(this, FuPriority.Argument);
break;
case FuId.ListAny:
WritePostfix(obj, ".contains ");
args[0].Accept(this, FuPriority.Argument);
break;
case FuId.ListClear:
case FuId.QueueClear:
case FuId.StackClear:
case FuId.HashSetClear:
case FuId.SortedSetClear:
case FuId.DictionaryClear:
case FuId.SortedDictionaryClear:
WritePostfix(obj, ".removeAll()");
break;
case FuId.ListIndexOf:
if (parent > FuPriority.Rel)
WriteChar('(');
WritePostfix(obj, ".firstIndex(of: ");
args[0].Accept(this, FuPriority.Argument);
Write(") ?? -1");
if (parent > FuPriority.Rel)
WriteChar(')');
break;
case FuId.ListInsert:
WritePostfix(obj, ".insert(");
FuType elementType = obj.Type.AsClassType().GetElementType();
if (args.Count == 1)
WriteNewStorage(elementType);
else
WriteCoerced(elementType, args[1], FuPriority.Argument);
Write(", at: ");
WriteCoerced(this.System.IntType, args[0], FuPriority.Argument);
WriteChar(')');
break;
case FuId.ListLast:
case FuId.StackPeek:
WritePostfix(obj, ".last");
break;
case FuId.ListRemoveAt:
WritePostfix(obj, ".remove(at: ");
WriteCoerced(this.System.IntType, args[0], FuPriority.Argument);
WriteChar(')');
break;
case FuId.ListRemoveRange:
WritePostfix(obj, ".removeSubrange(");
WriteRange(args[0], args[1]);
WriteChar(')');
break;
case FuId.QueueDequeue:
WritePostfix(obj, ".removeFirst()");
break;
case FuId.QueuePeek:
WritePostfix(obj, ".first");
break;
case FuId.StackPop:
WritePostfix(obj, ".removeLast()");
break;
case FuId.HashSetAdd:
case FuId.SortedSetAdd:
WritePostfix(obj, ".insert(");
WriteCoerced(obj.Type.AsClassType().GetElementType(), args[0], FuPriority.Argument);
WriteChar(')');
break;
case FuId.DictionaryAdd:
WriteDictionaryAdd(obj, args);
break;
case FuId.DictionaryContainsKey:
case FuId.SortedDictionaryContainsKey:
if (parent > FuPriority.Equality)
WriteChar('(');
WriteIndexing(obj, args[0]);
Write(" != nil");
if (parent > FuPriority.Equality)
WriteChar(')');
break;
case FuId.DictionaryRemove:
case FuId.SortedDictionaryRemove:
WritePostfix(obj, ".removeValue(forKey: ");
args[0].Accept(this, FuPriority.Argument);
WriteChar(')');
break;
case FuId.ConsoleWrite:
// TODO: stderr
Write("print(");
WriteUnwrapped(args[0], FuPriority.Argument, true);
Write(", terminator: \"\")");
break;
case FuId.ConsoleWriteLine:
// TODO: stderr
Write("print(");
if (args.Count == 1)
WriteUnwrapped(args[0], FuPriority.Argument, true);
WriteChar(')');
break;
case FuId.ConvertToBase64String:
Write("Data(");
OpenIndexing(args[0]);
WriteRange(args[1], args[2]);
Write("]).base64EncodedString()");
break;
case FuId.UTF8GetByteCount:
WriteUnwrapped(args[0], FuPriority.Primary, true);
Write(".utf8.count");
break;
case FuId.UTF8GetBytes:
if (AddVar("fubytes"))
Write(this.VarBytesAtIndent[this.Indent] ? "var " : "let ");
Write("fubytes = [UInt8](");
WriteUnwrapped(args[0], FuPriority.Primary, true);
WriteLine(".utf8)");
OpenIndexing(args[1]);
WriteCoerced(this.System.IntType, args[2], FuPriority.Shift);
if (args[2].IsLiteralZero())
Write("..<");
else {
Write(" ..< ");
WriteCoerced(this.System.IntType, args[2], FuPriority.Add); // FIXME: side effect
Write(" + ");
}
WriteLine("fubytes.count] = fubytes[...]");
break;
case FuId.UTF8GetString:
Write("String(decoding: ");
OpenIndexing(args[0]);
WriteRange(args[1], args[2]);
Write("], as: UTF8.self)");
break;
case FuId.EnvironmentGetEnvironmentVariable:
Include("Foundation");
Write("ProcessInfo.processInfo.environment[");
WriteUnwrapped(args[0], FuPriority.Argument, false);
WriteChar(']');
break;
case FuId.JsonElementParse:
Include("Foundation");
Write("try! JSONSerialization.jsonObject(with: ");
WritePostfix(args[0], ".data(using: .utf8)!, options: .fragmentsAllowed)");
break;
case FuId.JsonElementIsObject:
WriteJsonElementIs(obj, "[String: Any]", parent);
break;
case FuId.JsonElementIsArray:
WriteJsonElementIs(obj, "[Any]", parent);
break;
case FuId.JsonElementIsString:
WriteJsonElementIs(obj, "String", parent);
break;
case FuId.JsonElementIsNumber:
WriteJsonElementIs(obj, "Double", parent);
break;
case FuId.JsonElementIsBoolean:
WriteJsonElementIs(obj, "Bool", parent);
break;
case FuId.JsonElementIsNull:
WriteJsonElementIs(obj, "NSNull", parent);
break;
case FuId.JsonElementGetObject:
case FuId.JsonElementGetArray:
case FuId.JsonElementGetString:
case FuId.JsonElementGetDouble:
case FuId.JsonElementGetBoolean:
if (parent > FuPriority.Equality)
WriteChar('(');
obj.Accept(this, FuPriority.Equality); // FIXME?
Write(" as! ");
WriteType(method.Type);
if (parent > FuPriority.Equality)
WriteChar(')');
break;
case FuId.MathMethod:
case FuId.MathLog2:
Include("Foundation");
WriteCamelCase(method.Name);
WriteInParentheses(args);
break;
case FuId.MathAbs:
case FuId.MathMax:
case FuId.MathMin:
WriteCamelCase(method.Name);
WriteInParentheses(args);
break;
case FuId.MathCeiling:
Include("Foundation");
WriteCall("ceil", args[0]);
break;
case FuId.MathClamp:
Write("min(max(");
WriteClampAsMinMax(args);
break;
case FuId.MathFusedMultiplyAdd:
Include("Foundation");
WriteCall("fma", args[0], args[1], args[2]);
break;
case FuId.MathIsFinite:
WritePostfix(args[0], ".isFinite");
break;
case FuId.MathIsInfinity:
WritePostfix(args[0], ".isInfinite");
break;
case FuId.MathIsNaN:
WritePostfix(args[0], ".isNaN");
break;
case FuId.MathRound:
WritePostfix(args[0], ".rounded()");
break;
case FuId.MathTruncate:
Include("Foundation");
WriteCall("trunc", args[0]);
break;
default:
NotSupported(obj, method.Name);
break;
}
}
protected override void WriteNewArrayStorage!(FuArrayStorageType array)
{
if (IsArrayRef(array))
base.WriteNewArrayStorage(array);
else {
WriteChar('[');
WriteType(array.GetElementType());
Write("](repeating: ");
WriteDefaultValue(array.GetElementType());
Write(", count: ");
VisitLiteralLong(array.Length);
WriteChar(')');
}
}
protected override void WriteNew!(FuReadWriteClassType klass, FuPriority parent)
{
WriteClassName(klass);
Write("()");
}
void WriteDefaultValue!(FuType type)
{
switch (type) {
case FuNumericType:
WriteChar('0');
break;
case FuEnum enu:
if (enu.Id == FuId.BoolType)
Write("false");
else {
WriteName(enu);
WriteChar('.');
WriteName(enu.GetFirstValue());
}
break;
case FuStringType when !type.Nullable:
Write("\"\"");
break;
case FuArrayStorageType array:
WriteNewArrayStorage(array);
break;
default:
Write("nil");
break;
}
}
protected override void WriteNewArray!(FuType elementType, FuExpr lengthExpr, FuPriority parent)
{
this.ArrayRef = true;
Write("ArrayRef<");
WriteType(elementType);
Write(">(");
switch (elementType) {
case FuArrayStorageType:
Write("factory: { ");
WriteNewStorage(elementType);
Write(" }");
break;
case FuStorageType klass:
Write("factory: ");
WriteName(klass.Class);
Write(".init");
break;
default:
Write("repeating: ");
WriteDefaultValue(elementType);
break;
}
Write(", count: ");
lengthExpr.Accept(this, FuPriority.Argument);
WriteChar(')');
}
internal override void VisitPrefixExpr!(FuPrefixExpr expr, FuPriority parent)
{
if (expr.Op == FuToken.Tilde && expr.Type is FuEnumFlags) {
Write(expr.Type.Name);
Write("(rawValue: ~");
WritePostfix(expr.Inner, ".rawValue)");
}
else
base.VisitPrefixExpr(expr, parent);
}
protected override void WriteIndexingExpr!(FuBinaryExpr expr, FuPriority parent)
{
OpenIndexing(expr.Left);
assert expr.Left.Type is FuClassType klass;
FuType indexType;
switch (klass.Class.Id) {
case FuId.ArrayPtrClass:
case FuId.ArrayStorageClass:
case FuId.ListClass:
indexType = this.System.IntType;
break;
default:
indexType = klass.GetKeyType();
break;
}
WriteCoerced(indexType, expr.Right, FuPriority.Argument);
WriteChar(']');
if (parent != FuPriority.Assign && expr.Left.Type is FuClassType dict && dict.Class.TypeParameterCount == 2)
WriteChar('!');
}
protected override void WriteBinaryOperand!(FuExpr expr, FuPriority parent, FuBinaryExpr binary)
{
if (expr.Type.Id != FuId.BoolType) {
if (binary.Op == FuToken.Plus && binary.Type.Id == FuId.StringStorageType) {
WriteUnwrapped(expr, parent, true);
return;
}
switch (binary.Op) {
case FuToken.Plus:
case FuToken.Minus:
case FuToken.Asterisk:
case FuToken.Slash:
case FuToken.Mod:
case FuToken.And:
case FuToken.Or:
case FuToken.Xor:
case FuToken.ShiftLeft when expr == binary.Left:
case FuToken.ShiftRight when expr == binary.Left:
if (!(expr is FuLiteral)) {
FuType type = this.System.PromoteNumericTypes(binary.Left.Type, binary.Right.Type);
if (type != expr.Type) {
WriteCoerced(type, expr, parent);
return;
}
}
break;
case FuToken.Equal:
case FuToken.NotEqual:
case FuToken.Less:
case FuToken.LessOrEqual:
case FuToken.Greater:
case FuToken.GreaterOrEqual:
FuType? typeComp = this.System.PromoteFloatingTypes(binary.Left.Type, binary.Right.Type);
if (typeComp != null && typeComp != expr.Type) {
WriteCoerced(typeComp, expr, parent);
return;
}
break;
default:
break;
}
}
expr.Accept(this, parent);
}
void WriteEnumFlagsAnd!(FuExpr left, string method, string notMethod, FuExpr right)
{
if (right is FuPrefixExpr negation && negation.Op == FuToken.Tilde)
WriteMethodCall(left, notMethod, negation.Inner);
else
WriteMethodCall(left, method, right);
}
FuExpr WriteAssignNested!(FuBinaryExpr expr)
{
if (expr.Right is FuBinaryExpr rightBinary && rightBinary.IsAssign()) {
VisitBinaryExpr(rightBinary, FuPriority.Statement);
WriteNewLine();
return rightBinary.Left; // FIXME: side effect
}
return expr.Right;
}