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/*
Copyright 2017 YANG Huan ([email protected]).
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
using System;
using System.Collections.Generic;
using System.Diagnostics.Contracts;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Globalization;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using CSharpLua.LuaAst;
namespace CSharpLua {
public sealed partial class LuaSyntaxNodeTransform {
private sealed class FunctionUpValuesInfo {
private readonly HashSet<string> strings_ = new();
private readonly HashSet<ISymbol> symbols_ = new(SymbolEqualityComparer.Default);
private readonly Dictionary<ISymbol, bool> maxSymbols_ = new(SymbolEqualityComparer.Default);
public int Count { get; private set; }
public void Add(object nameStringOrSymbol) {
if (nameStringOrSymbol is string name) {
if (strings_.Add(name)) {
++Count;
}
} else {
var symbol = (ISymbol)nameStringOrSymbol;
if (symbols_.Add(symbol.OriginalDefinition)) {
Count += symbol.Kind is SymbolKind.Property or SymbolKind.Event ? 2 : 1;
}
}
}
internal bool Contains(object nameStringOrSymbol) {
if (nameStringOrSymbol is string name) {
return strings_.Contains(name);
}
return symbols_.Contains((ISymbol)nameStringOrSymbol);
}
internal void AddMaxSymbol(object nameStringOrSymbol) {
if (nameStringOrSymbol is ISymbol symbol) {
symbol = symbol.OriginalDefinition;
if (!maxSymbols_.ContainsKey(symbol)) {
maxSymbols_.Add(symbol, false);
}
}
}
internal bool ContainsMaxSymbol(ISymbol symbol, out bool isNeedImport) {
isNeedImport = false;
symbol = symbol.OriginalDefinition;
if (maxSymbols_.TryGetValue(symbol, out bool isAssignment)) {
if (!isAssignment) {
isNeedImport = true;
maxSymbols_[symbol] = true;
}
return true;
}
return false;
}
}
private static readonly Regex codeTemplateRegex_ = new(@"(,?\s*)\{(\*?[\w|`]+)\}", RegexOptions.Compiled);
private static readonly Regex unicodeRegex_ = new(@"\\u([0-9a-fA-F]{4})", RegexOptions.Compiled);
private readonly Dictionary<ISymbol, LuaIdentifierNameSyntax> localReservedNames_ = new(SymbolEqualityComparer.Default);
private readonly Dictionary<LuaFunctionExpressionSyntax, FunctionUpValuesInfo> functionUpValues_ = new();
private int localMappingCounter_;
private readonly Stack<bool> checks_ = new();
private abstract class LuaSyntaxSearcher : CSharpSyntaxWalker {
private sealed class FoundException : Exception {
}
protected void Found() {
throw new FoundException();
}
public bool Find(SyntaxNode root) {
try {
Visit(root);
} catch (FoundException) {
return true;
}
return false;
}
}
private sealed class LocalVarSearcher : LuaSyntaxSearcher {
private readonly string name_;
public LocalVarSearcher(string name) {
name_ = name;
}
public override void VisitParameter(ParameterSyntax node) {
if (node.Identifier.ValueText == name_) {
Found();
}
}
public override void VisitVariableDeclarator(VariableDeclaratorSyntax node) {
if (node.Identifier.ValueText == name_) {
Found();
}
}
}
private static bool IsLocalVarExists(string name, SyntaxNode root) {
var searcher = new LocalVarSearcher(name);
return searcher.Find(root);
}
private static SyntaxNode FindParent(SyntaxNode node, Func<SyntaxNode, bool> match) {
var parent = node.Parent;
while (true) {
if (match(parent)) {
return parent;
}
parent = parent.Parent;
}
}
private static SyntaxNode FindParent(SyntaxNode node, SyntaxKind kind) {
return FindParent(node, i => i.IsKind(kind));
}
private static (SyntaxNode node, BlockSyntax body) FindParentMethodDeclaration(SyntaxNode node) {
BlockSyntax body = null;
var parent = FindParent(node, i => {
switch (i.Kind()) {
case SyntaxKind.ConstructorDeclaration:
case SyntaxKind.MethodDeclaration:
case SyntaxKind.OperatorDeclaration:
case SyntaxKind.ConversionOperatorDeclaration: {
var methodDeclaration = (BaseMethodDeclarationSyntax)i;
body = methodDeclaration.Body;
return true;
}
case SyntaxKind.LocalFunctionStatement: {
var localFunction = (LocalFunctionStatementSyntax)i;
body = localFunction.Body;
return true;
}
case SyntaxKind.GetAccessorDeclaration:
case SyntaxKind.SetAccessorDeclaration: {
var accessorDeclaration = (AccessorDeclarationSyntax)i;
body = accessorDeclaration.Body;
return true;
}
}
return false;
});
return (parent, body);
}
private static BlockSyntax FindParentMethodBody(SyntaxNode node) {
return FindParentMethodDeclaration(node).body;
}
private static bool IsLastStatement(StatementSyntax statement) {
return FindParentMethodBody(statement)?.Statements.Last() == statement;
}
private static string GetUniqueIdentifier(string name, SyntaxNode node, int index = 0) {
var (root, _) = FindParentMethodDeclaration(node);
while (true) {
string newName = Utility.GetNewIdentifierName(name, index);
bool exists = IsLocalVarExists(newName, root);
if (!exists) {
return newName;
}
++index;
}
}
private static bool CheckLocalBadWord(ref string name, SyntaxNode node) {
if (LuaSyntaxNode.IsReservedWord(name)) {
name = GetUniqueIdentifier(name, node, 1);
return true;
}
if (Utility.IsIdentifierIllegal(ref name)) {
name = GetUniqueIdentifier(name, node);
return true;
}
return false;
}
private void AddLocalVariableMapping(LuaIdentifierNameSyntax name, SyntaxNode node) {
ISymbol symbol = semanticModel_.GetDeclaredSymbol(node);
Contract.Assert(symbol != null);
localReservedNames_.Add(symbol, name);
}
private bool CheckLocalVariableName(ref LuaIdentifierNameSyntax identifierName, SyntaxNode node) {
string name = identifierName.ValueText;
bool isReserved = CheckLocalBadWord(ref name, node);
if (isReserved) {
identifierName = name;
AddLocalVariableMapping(identifierName, node);
return true;
}
return false;
}
private void CheckLocalSymbolName(ISymbol symbol, ref LuaIdentifierNameSyntax name) {
var newName = localReservedNames_.GetOrDefault(symbol);
if (newName != null) {
name = newName;
}
}
private static bool IsStaticLocalMethodEnableAddToType(IMethodSymbol symbol) {
const int kMaxMemberCountLimit = 150;
return symbol.ContainingType.GetMembers().Length < kMaxMemberCountLimit;
}
private LuaIdentifierNameSyntax GetLocalMethodName(IMethodSymbol symbol, SyntaxNode node) {
Contract.Assert(symbol.MethodKind == MethodKind.LocalFunction);
var identifierName = localReservedNames_.GetOrDefault(symbol);
if (identifierName == null) {
var localFunctionNode = (LocalFunctionStatementSyntax)symbol.GetDeclaringSyntaxNode();
string name = symbol.Name;
if (localFunctionNode.Modifiers.IsStatic() && IsStaticLocalMethodEnableAddToType(symbol)) {
Utility.IsIdentifierIllegal(ref name);
name = generator_.GetUniqueNameInType(symbol.ContainingType, name, newName => {
if (LuaSyntaxNode.IsMethodReservedWord(newName)) {
return false;
}
var body = FindParentMethodBody(node);
Contract.Assert(body != null);
return !IsLocalVarExists(newName, body);
});
} else {
if (LuaSyntaxNode.IsReservedWord(name)) {
CheckLocalBadWord(ref name, node);
}
}
identifierName = name;
localReservedNames_.Add(symbol, identifierName);
}
return identifierName;
}
private sealed class ContinueSearcher : LuaSyntaxSearcher {
public override void VisitContinueStatement(ContinueStatementSyntax node) {
Found();
}
}
private static bool IsContinueExists(SyntaxNode node) {
ContinueSearcher searcher = new ContinueSearcher();
return searcher.Find(node);
}
private int GetCaseLabelIndex(GotoStatementSyntax node) {
var switchStatement = (SwitchStatementSyntax)FindParent(node, SyntaxKind.SwitchStatement);
int index = 0;
foreach (var section in switchStatement.Sections) {
bool isFound = section.Labels.Any(i => {
if (i.IsKind(SyntaxKind.CaseSwitchLabel)) {
var label = (CaseSwitchLabelSyntax)i;
if (label.Value.ToString() == node.Expression!.ToString()) {
return true;
}
}
return false;
});
if (isFound) {
return index;
}
++index;
}
throw new InvalidOperationException();
}
private LuaExpressionSyntax BuildCodeTemplateExpression(string codeTemplate, ExpressionSyntax targetExpression) {
return InternalBuildCodeTemplateExpression(codeTemplate, targetExpression, null, null);
}
private LuaExpressionSyntax BuildCodeTemplateExpression(string codeTemplate, LuaIdentifierNameSyntax targetExpression) {
return InternalBuildCodeTemplateExpression(codeTemplate, null, null, null, targetExpression);
}
private LuaExpressionSyntax BuildCodeTemplateExpression(string codeTemplate, IEnumerable<LuaExpressionSyntax> arguments, LuaIdentifierNameSyntax memberBindingIdentifier) {
return InternalBuildCodeTemplateExpression(codeTemplate, null, arguments.Select<LuaExpressionSyntax, Func<LuaExpressionSyntax>>(i => () => i), null, memberBindingIdentifier);
}
private LuaExpressionSyntax BuildCodeTemplateExpression(string codeTemplate, ExpressionSyntax targetExpression, IEnumerable<LuaExpressionSyntax> arguments, IList<ITypeSymbol> typeArguments) {
return InternalBuildCodeTemplateExpression(codeTemplate, targetExpression, arguments.Select<LuaExpressionSyntax, Func<LuaExpressionSyntax>>(i => () => i), typeArguments);
}
private LuaExpressionSyntax BuildCodeTemplateExpression(string codeTemplate, ExpressionSyntax targetExpression, IEnumerable<Func<LuaExpressionSyntax>> arguments, IList<ITypeSymbol> typeArguments) {
return InternalBuildCodeTemplateExpression(codeTemplate, targetExpression, arguments, typeArguments);
}
private void AddCodeTemplateExpression(LuaExpressionSyntax expression, string comma, LuaCodeTemplateExpressionSyntax codeTemplateExpression) {
if (!string.IsNullOrEmpty(comma)) {
codeTemplateExpression.Expressions.Add(comma);
}
codeTemplateExpression.Expressions.Add(expression);
}
private LuaExpressionSyntax InternalBuildCodeTemplateExpression(
string codeTemplate,
ExpressionSyntax targetExpression,
IEnumerable<Func<LuaExpressionSyntax>> arguments,
IList<ITypeSymbol> typeArguments,
LuaIdentifierNameSyntax memberBindingIdentifier = null) {
LuaCodeTemplateExpressionSyntax codeTemplateExpression = new LuaCodeTemplateExpressionSyntax();
var matches = codeTemplateRegex_.Matches(codeTemplate);
int prevIndex = 0;
foreach (Match match in matches) {
if (match.Index > prevIndex) {
string prevToken = codeTemplate[prevIndex..match.Index];
codeTemplateExpression.Expressions.Add(prevToken);
}
string comma = match.Groups[1].Value;
string key = match.Groups[2].Value;
switch (key)
{
case "this":
var thisExpression = memberBindingIdentifier ?? (targetExpression != null ? BuildMemberAccessTargetExpression(targetExpression) : LuaIdentifierNameSyntax.This);
AddCodeTemplateExpression(thisExpression, comma, codeTemplateExpression);
break;
case "class":
{
var type = semanticModel_.GetTypeInfo(targetExpression).Type;
var typeName = GetTypeName(type);
AddCodeTemplateExpression(typeName, comma, codeTemplateExpression);
break;
}
default: {
switch (key[0])
{
case '`': {
if (key.StartsWith("``")) {
if (int.TryParse(key[2..], out int classTypeIndex)) {
var classType = (INamedTypeSymbol)semanticModel_.GetTypeInfo(targetExpression).Type;
var typeArgument = classType.TypeArguments.GetOrDefault(classTypeIndex);
if (typeArgument != null) {
var typeName = GetTypeName(typeArgument);
AddCodeTemplateExpression(typeName, comma, codeTemplateExpression);
}
}
} else if (int.TryParse(key[1..], out int typeIndex)) {
var typeArgument = typeArguments.GetOrDefault(typeIndex);
if (typeArgument != null) {
LuaExpressionSyntax typeName;
if (typeArgument.TypeKind == TypeKind.Enum && codeTemplate.StartsWith("System.Enum")) {
typeName = GetTypeShortName(typeArgument);
AddExportEnum(typeArgument);
} else {
typeName = GetTypeName(typeArgument);
}
AddCodeTemplateExpression(typeName, comma, codeTemplateExpression);
}
}
break;
}
case '*': {
if (int.TryParse(key[1..], out int paramsIndex)) {
LuaSequenceListExpressionSyntax sequenceList = new LuaSequenceListExpressionSyntax();
foreach (var argument in arguments.Skip(paramsIndex)) {
var argumentExpression = argument();
sequenceList.Expressions.Add(argumentExpression);
}
if (sequenceList.Expressions.Count > 0) {
AddCodeTemplateExpression(sequenceList, comma, codeTemplateExpression);
}
}
break;
}
default: {
if (int.TryParse(key, out int argumentIndex)) {
var argument = arguments?.ElementAtOrDefault(argumentIndex);
if (argument != null) {
var argumentExpression = argument();
AddCodeTemplateExpression(argumentExpression, comma, codeTemplateExpression);
}
}
break;
}
}
break;
}
}
prevIndex = match.Index + match.Length;
}
if (prevIndex < codeTemplate.Length) {
string last = codeTemplate[prevIndex..];
codeTemplateExpression.Expressions.Add(last);
}
return codeTemplateExpression;
}
private void AddExportEnum(ITypeSymbol enumType) {
generator_.AddExportEnum(enumType);
}
private bool IsPropertyTemplate(IPropertySymbol symbol) {
return generator_.IsPropertyTemplate(symbol);
}
private bool IsPropertyField(IPropertySymbol symbol) {
return generator_.IsPropertyField(symbol);
}
private bool IsEventField(IEventSymbol symbol) {
return generator_.IsEventField(symbol);
}
private bool IsPropertyFieldOrEventField(ISymbol symbol) {
return generator_.IsPropertyFieldOrEventField(symbol);
}
private bool IsMoreThanLocalVariables(ISymbol symbol) {
return generator_.IsMoreThanLocalVariables(symbol);
}
private bool IsMoreThanUpValueStaticInitField(ISymbol symbol) {
return generator_.IsMoreThanUpValueStaticCtorField(symbol);
}
private bool IsInternalMember(ISymbol symbol) {
if (symbol.IsFromCode()) {
bool isVirtual = symbol.IsOverridable() && !generator_.IsSealed(symbol.ContainingType);
if (!isVirtual) {
var typeSymbol = CurTypeSymbol;
if (typeSymbol.IsContainsInternalSymbol(symbol) && !IsMoreThanLocalVariables(symbol) && !IsMoreThanUpValues(symbol)) {
return true;
}
}
}
return false;
}
private LuaExpressionSyntax BuildArray(IArrayTypeSymbol symbol, params LuaExpressionSyntax[] elements) {
return BuildArray(symbol.ElementType, elements);
}
private LuaExpressionSyntax BuildArray(ITypeSymbol elementType, params LuaExpressionSyntax[] elements) {
var baseType = GetTypeName(elementType);
var arrayType = new LuaInvocationExpressionSyntax(LuaIdentifierNameSyntax.Array, baseType);
return BuildArray(elementType, arrayType, elements);
}
private LuaExpressionSyntax BuildArray(ITypeSymbol elementType, LuaExpressionSyntax arrayType, IList<LuaExpressionSyntax> elements) {
var invocation = new LuaInvocationExpressionSyntax(arrayType);
var table = new LuaTableExpression(elements);
bool isElementNotNull = (elementType.IsValueType && !elementType.IsNullableType())
|| elements.All(i => i is LuaLiteralExpressionSyntax && i != LuaIdentifierLiteralExpressionSyntax.Nil);
if (isElementNotNull) {
invocation.AddArgument(table);
invocation.ArgumentList.IsCallSingleTable = true;
} else {
invocation.AddArgument(elements.Count);
invocation.AddArgument(table);
}
table.IsSingleLine = elements.All(i => i is LuaLiteralExpressionSyntax || i is LuaIdentifierNameSyntax);
return invocation;
}
private LuaExpressionSyntax BuildArray(LuaExpressionSyntax arrayType, LuaExpressionSyntax size) {
return arrayType.Invocation(size);
}
private LuaExpressionSyntax BuildMultiArray(LuaExpressionSyntax arrayType, LuaExpressionSyntax rank, List<LuaExpressionSyntax> elements = null) {
var invocation = new LuaInvocationExpressionSyntax(arrayType, rank);
if (elements != null) {
invocation.AddArgument(new LuaTableExpression(elements) { IsSingleLine = true });
}
return invocation;
}
private LuaLiteralExpressionSyntax GetLiteralExpression(object constantValue) {
if (constantValue != null) {
var code = Type.GetTypeCode(constantValue.GetType());
switch (code) {
case TypeCode.Char: {
return new LuaCharacterLiteralExpression((char)constantValue);
}
case TypeCode.String: {
return BuildStringLiteralExpression((string)constantValue);
}
case TypeCode.Boolean: {
bool v = (bool)constantValue;
return v ? LuaIdentifierLiteralExpressionSyntax.True : LuaIdentifierLiteralExpressionSyntax.False;
}
case TypeCode.Single: {
float v = (float)constantValue;
return (LuaFloatLiteralExpressionSyntax)v;
}
case TypeCode.Double: {
double v = (double)constantValue;
return (LuaDoubleLiteralExpressionSyntax)v;
}
case TypeCode.Int64: {
if (constantValue is long.MinValue) {
const long kMinInteger = long.MinValue + 1; // in lua5.4 long.MinValue will be float
return new LuaIdentifierLiteralExpressionSyntax($"({kMinInteger} - 1)");
}
break;
}
}
return new LuaIdentifierLiteralExpressionSyntax(constantValue.ToString());
}
return LuaIdentifierLiteralExpressionSyntax.Nil;
}
private LuaExpressionSyntax GetConstLiteralExpression(IFieldSymbol constField) {
Contract.Assert(constField.HasConstantValue);
if (constField.Type.SpecialType == SpecialType.System_Char) {
return new LuaCharacterLiteralExpression((char)constField.ConstantValue);
}
if (constField.Type.TypeKind == TypeKind.Enum && !generator_.IsConstantEnum(constField.Type)) {
var typeName = GetTypeName(constField.Type);
return typeName.MemberAccess(constField.Name);
}
var literalExpression = GetLiteralExpression(constField.ConstantValue);
string identifierToken = constField.ContainingType.Name + '.' + constField.Name;
return new LuaConstLiteralExpression(literalExpression, identifierToken);
}
private LuaLiteralExpressionSyntax GetConstLiteralExpression(ILocalSymbol constLocal) {
Contract.Assert(constLocal.HasConstantValue);
if (constLocal.Type.SpecialType == SpecialType.System_Char) {
return new LuaCharacterLiteralExpression((char)constLocal.ConstantValue);
}
var literalExpression = GetLiteralExpression(constLocal.ConstantValue);
string identifierToken = constLocal.Name;
return new LuaConstLiteralExpression(literalExpression, identifierToken);
}
private LuaLiteralExpressionSyntax GetConstExpression(ExpressionSyntax node) {
var constValue = semanticModel_.GetConstantValue(node);
if (constValue.HasValue) {
switch (constValue.Value) {
case double d:
switch (d) {
case double.NegativeInfinity:
case double.PositiveInfinity:
case double.NaN:
return null;
}
break;
case float f:
switch (f) {
case float.NegativeInfinity:
case float.PositiveInfinity:
case float.NaN:
return null;
}
break;
case null:
return LuaIdentifierLiteralExpressionSyntax.Nil;
}
var literalExpression = GetLiteralExpression(constValue.Value);
return new LuaConstLiteralExpression(literalExpression, node.ToString());
}
return null;
}
private string DecodeUnicodeCharacter(string text) {
if (unicodeRegex_.IsMatch(text)) {
if (IsLuaClassic) {
return unicodeRegex_.Replace(text, m => {
if (short.TryParse(m.Groups[1].Value, NumberStyles.HexNumber, CultureInfo.InvariantCulture, out var c)) {
char ch = (char)c;
switch (ch) {
case '\a': {
return "\\a";
}
case '\b': {
return "\\b";
}
case '\f': {
return "\\f";
}
case '\n': {
return "\\n";
}
case '\r': {
return "\\r";
}
case '\t': {
return "\\t";
}
case '\v': {
return "\\v";
}
case '\\': {
return "\\";
}
case '"': {
return "\\\"";
}
}
return ch.ToString();
}
return m.Value;
});
}
return unicodeRegex_.Replace(text, m => $@"\u{{{m.Groups[1].Value}}}");
}
return text;
}
private LuaLiteralExpressionSyntax BuildStringLiteralTokenExpression(SyntaxToken token) {
if (token.Text[0] == '@') {
return BuildVerbatimStringExpression(token.ValueText);
}
return new LuaIdentifierLiteralExpressionSyntax(DecodeUnicodeCharacter(token.Text));
}
private LuaIdentifierLiteralExpressionSyntax BuildStringLiteralExpression(string value) {
string text = SyntaxFactory.Literal(value).Text;
return new LuaIdentifierLiteralExpressionSyntax(text);
}
private LuaVerbatimStringLiteralExpressionSyntax BuildVerbatimStringExpression(string value) {
return new(value);
}
private enum CallerAttributeKind {
None,
Line,
Member,
FilePath,
ArgumentExpression,
}
private CallerAttributeKind GetCallerAttributeKind(INamedTypeSymbol symbol) {
if (symbol.ContainingNamespace.IsRuntimeCompilerServices()) {
return symbol.Name switch
{
"CallerLineNumberAttribute" => CallerAttributeKind.Line,
"CallerMemberNameAttribute" => CallerAttributeKind.Member,
"CallerFilePathAttribute" => CallerAttributeKind.FilePath,
"CallerArgumentExpressionAttribute" => CallerAttributeKind.ArgumentExpression,
_ => CallerAttributeKind.None
};
}
return CallerAttributeKind.None;
}
private CallerAttributeKind GetCallerAttributeKind(IParameterSymbol parameter) {
foreach (var attribute in parameter.GetAttributes()) {
var callerKind = GetCallerAttributeKind(attribute.AttributeClass);
if (callerKind != CallerAttributeKind.None) {
return callerKind;
}
}
return CallerAttributeKind.None;
}
private LuaExpressionSyntax CheckCallerAttribute(IParameterSymbol parameter, SyntaxNode node) {
var kind = GetCallerAttributeKind(parameter);
switch (kind) {
case CallerAttributeKind.Line: {
var lineSpan = node.SyntaxTree.GetLineSpan(node.Span);
return lineSpan.StartLinePosition.Line + 1;
}
case CallerAttributeKind.Member: {
string memberName = null;
FindParent(node, i => {
switch (i.Kind()) {
case SyntaxKind.MethodDeclaration: {
var method = (MethodDeclarationSyntax)i;
memberName = method.Identifier.ValueText;
return true;
}
case SyntaxKind.PropertyDeclaration: {
var property = (PropertyDeclarationSyntax)i;
memberName = property.Identifier.ValueText;
return true;
}
case SyntaxKind.EventDeclaration: {
var @event = (EventDeclarationSyntax)i;
memberName = @event.Identifier.ValueText;
return true;
}
}
return false;
});
Contract.Assert(memberName != null);
return new LuaStringLiteralExpressionSyntax(memberName);
}
case CallerAttributeKind.FilePath: {
return BuildStringLiteralExpression(generator_.RemoveBaseFolder(node.SyntaxTree.FilePath));
}
case CallerAttributeKind.ArgumentExpression: {
var invocation = (InvocationExpressionSyntax)node;
var text = invocation.ArgumentList.Arguments.FirstOrDefault()?.ToString() ?? string.Empty;
return new LuaStringLiteralExpressionSyntax(text);
}
default:
return null;
}
}
private bool CheckUsingStaticNameSyntax(ISymbol symbol, NameSyntax node, LuaExpressionSyntax expression, out LuaMemberAccessExpressionSyntax outExpression) {
bool isUsingStaticName = false;
if (node.Parent.IsKind(SyntaxKind.SimpleMemberAccessExpression)) {
var memberAccess = (MemberAccessExpressionSyntax)node.Parent;
if (memberAccess.Expression == node) {
isUsingStaticName = true;
}
} else {
isUsingStaticName = true;
}
if (isUsingStaticName) {
if (!CurTypeSymbol.IsContainsInternalSymbol(symbol)) {
var usingStaticType = GetTypeName(symbol.ContainingType);
outExpression = usingStaticType.MemberAccess(expression);
return true;
}
}
outExpression = null;
return false;
}
private bool MayBeFalse(ExpressionSyntax expression, ITypeSymbol type) {
bool mayBeFalse = false;
if (type.IsValueType) {
if (type.SpecialType == SpecialType.System_Boolean) {
var constValue = semanticModel_.GetConstantValue(expression);
if (constValue.HasValue && (bool)constValue.Value) {
mayBeFalse = false;
} else {
mayBeFalse = true;
}
}
}
return mayBeFalse;
}
private bool MayBeNull(ExpressionSyntax expression, ITypeSymbol type) {
if (expression.IsKind(SyntaxKind.ObjectInitializerExpression)) {
return false;
}
Contract.Assert(type != null);
bool mayBeNull;
if (type.IsValueType) {
mayBeNull = false;
} else if (type.IsStringType()) {
var constValue = semanticModel_.GetConstantValue(expression);
if (constValue.HasValue) {
mayBeNull = false;
} else {
if (expression.IsKind(SyntaxKind.InvocationExpression)) {
var invocation = (InvocationExpressionSyntax)expression;
if (invocation.Expression.IsKind(SyntaxKind.SimpleMemberAccessExpression)) {
var memberAccess = (MemberAccessExpressionSyntax)invocation.Expression;
if (memberAccess.Name.Identifier.ValueText == LuaIdentifierNameSyntax.ToStr.ValueText) {
var typeInfo = semanticModel_.GetTypeInfo(memberAccess.Expression).Type;
if (typeInfo.SpecialType > SpecialType.System_Object) {
return false;
}
}
}
} else if (expression.IsKind(SyntaxKind.SimpleMemberAccessExpression)) {
var memberAccess = (MemberAccessExpressionSyntax)expression;
var typeInfo = semanticModel_.GetTypeInfo(memberAccess.Expression).Type;
if (typeInfo.SpecialType > SpecialType.System_Object) {
return false;
}
}
mayBeNull = true;
}
} else {
switch (expression.Kind()) {
case SyntaxKind.ObjectCreationExpression:
case SyntaxKind.ArrayCreationExpression: {
mayBeNull = false;
break;
}
default: {
mayBeNull = true;
break;
}
}
}
return mayBeNull;
}
private bool MayBeNullOrFalse(ExpressionSyntax conditionalWhenTrue) {
switch (conditionalWhenTrue.Kind()) {
case SyntaxKind.NullLiteralExpression:
return true;
case SyntaxKind.ParenthesizedLambdaExpression:
return false;
case SyntaxKind.IdentifierName:
var symbol = semanticModel_.GetSymbolInfo(conditionalWhenTrue).Symbol;
if (symbol != null) {
if (symbol.Kind == SymbolKind.Method) {
return false;
}
}
break;
}
var type = semanticModel_.GetTypeInfo(conditionalWhenTrue!).Type;
return MayBeNull(conditionalWhenTrue, type) || MayBeFalse(conditionalWhenTrue, type);
}
private bool IsLocalVarExistsInCurMethod(string name) {
var methodInfo = CurMethodInfoOrNull;
if (methodInfo != null) {
var root = methodInfo.Symbol.GetDeclaringSyntaxNode();
if (IsLocalVarExists(name, root)) {
return true;
}
}
return false;
}
private static bool IsMethodTypeArgument(IMethodSymbol method, ITypeSymbol symbol) {
if (method.TypeArguments.Length > 0) {
return method.TypeArguments.Any(symbol.IsTypeParameterExists);
}
if (method.MethodKind is MethodKind.LambdaMethod or MethodKind.LocalFunction) {
if (method.ContainingSymbol is IMethodSymbol containingMethod) {
return IsMethodTypeArgument(containingMethod, symbol);
}
}
return false;
}
private bool IsCurMethodTypeArgument(ITypeSymbol symbol) {
var methodInfo = CurMethodInfoOrNull;
if (methodInfo != null) {
return IsMethodTypeArgument(methodInfo.Symbol, symbol);
}
return false;
}
private bool IsImportTypeNameEnable(INamedTypeSymbol symbol) {
if (symbol.IsGenericType) {
if (symbol.IsTypeParameterExists() && !IsCurMethodTypeArgument(symbol)) {
return false;
}
}
if (!IsNoneGenericTypeCounter && CurTypeDeclaration?.TypeSymbol?.IsGenericType == true) {
return false;
}
return true;
}
private void CheckNewPrefix(ref string newPrefix, string prefix) {
var usingDeclare = CurCompilationUnit.UsingDeclares.Find(i => i.Prefix == prefix);
if (usingDeclare != null) {
newPrefix = usingDeclare.NewPrefix;
return;
}
string newName = newPrefix;
const int kMaxNameLength = 25;
if (newPrefix.Length > kMaxNameLength) {
string[] names = prefix.Split('.');
if (names.Length > 2) {
string head = names.First();
string tail = names.Last();
newName = head + tail;
if (newName.Length > kMaxNameLength) {
newName = tail;
}
}
}
int index = 0;
while (true) {
string result = Utility.GetNewIdentifierName(newName, index);
if (!CurCompilationUnit.UsingDeclares.Exists(i => i.NewPrefix == result)) {
newPrefix = result;
return;
}
++index;
}
}
private int MaxUpValueCount {
get {
return generator_.GetMethodMaxUpValueCount(CurMethodInfoOrNull?.Symbol);
}
}
private bool IsMoreThanUpValues(object nameStringOrSymbol) {
if (IsLuaNewest) {
return false;
}
var current = CurFunctionOrNull;
if (current != null) {
var upValues = functionUpValues_.GetOrDefault(current);
if (upValues != null) {
if (!upValues.Contains(nameStringOrSymbol)) {
if (upValues.Count >= MaxUpValueCount) {
upValues.AddMaxSymbol(nameStringOrSymbol);
return true;
}
upValues.Add(nameStringOrSymbol);
}
} else {
upValues = new FunctionUpValuesInfo();
functionUpValues_.Add(current, upValues);
upValues.Add(nameStringOrSymbol);
}
}
return false;
}
private bool IsMaxUpValues(ISymbol symbol, out bool isNeedImport) {
isNeedImport = false;
if (IsLuaNewest) {
return false;
}
var current = CurFunctionOrNull;
if (current != null) {
var upValues = functionUpValues_.GetOrDefault(current);
return upValues != null && upValues.ContainsMaxSymbol(symbol, out isNeedImport);
}
return false;
}
private bool IsImportFunctionUpValuesMax {
get {
const int kMaxCountUpValues = LuaSyntaxNode.kUpvaluesMaxCount - 1; // System
int usingDeclaresCount = CurCompilationUnit.UsingDeclares.Count(i => i.IsFromCode);
var genericDeclaresCount = CurCompilationUnit.GenericUsingDeclares.Count(i => i.IsFromCode);
return usingDeclaresCount + genericDeclaresCount >= kMaxCountUpValues;
}
}
private bool AddImport(string prefix, string newPrefix, bool isFromCode) {
if (CurCompilationUnit.UsingDeclares.Exists(i => i.Prefix == prefix && i.IsFromCode == isFromCode)) {
if (!IsLuaNewest && IsMoreThanUpValues(newPrefix)) {
return false;
}
return true;
}
if (!IsLuaNewest) {
if (IsImportFunctionUpValuesMax) {
return false;
}
if (IsMoreThanUpValues(newPrefix)) {
return false;
}
}
CurCompilationUnit.UsingDeclares.Add(new UsingDeclare {
Prefix = prefix,
NewPrefix = newPrefix,
IsFromCode = isFromCode,
});
return true;
}