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using AtLangCompiler.Methods;
using System.Reflection;
namespace AtLangCompiler.Tests
{
[TestClass]
public class ParserTests
{
[TestMethod]
[Description("Test initialization of the parser")]
public void Parser_Initialization_SetsCurrentToken()
{
var lexer = new Lexer("@if");
var parser = new Parser(lexer);
Assert.AreEqual(TokenType.IF, parser.current.Type);
}
[TestMethod]
[Description("Test dynamic statement parsing from ParserFor attributes")]
[DynamicData(nameof(GetParserStatementData), DynamicDataSourceType.Method, DynamicDataDisplayName = nameof(DisplayParserData))]
public void ParseStatement_ValidToken_ReturnsExpectedStatement(TokenType tokenType,
Type parserType,
string tokenStatement)
{
var lexer = new Lexer(tokenStatement);
var parser = new Parser(lexer);
ASTNode? result = parser.ParseStatement();
Assert.IsNotNull(result);
Assert.IsInstanceOfType(result, typeof(ASTNode));
}
[TestMethod]
[Description("Test ParseProgram handles multiple statements")]
public void ParseProgram_MultipleStatements_ReturnsAllStatements()
{
var lexer = new Lexer(@"
@NAME = @getEnv(@USERNAME)
@GREETING = ""Hello, ""
@print(@GREETING + @NAME)");
var parser = new Parser(lexer);
var program = parser.ParseProgram();
Assert.AreEqual(3, program.Count);
Assert.AreEqual(typeof(EnvVarAssignment), program[0].GetType());
Assert.AreEqual(typeof(EnvVarAssignment), program[1].GetType());
Assert.AreEqual(typeof(PrintStatement), program[2].GetType());
}
[TestMethod]
[Description("Test ParseExpression handles binary expressions")]
public void ParseExpression_BinaryExpression_ReturnsBinaryExpressionNode()
{
var lexer = new Lexer("@var1 + \"string\"");
var parser = new Parser(lexer);
var expression = parser.ParseExpression();
Assert.IsInstanceOfType(expression, typeof(BinaryExpression));
}
[TestMethod]
[Description("Test Eat method advances token correctly")]
public void Eat_CorrectToken_AdvancesCurrentToken()
{
var lexer = new Lexer("@if +");
var parser = new Parser(lexer);
parser.Eat(TokenType.IF);
Assert.AreEqual(TokenType.PLUS, parser.current.Type);
}
[TestMethod]
[Description("Test Eat throws exception for incorrect token")]
[ExpectedException(typeof(Exception))]
public void Eat_IncorrectToken_ThrowsException()
{
var lexer = new Lexer("@else");
var parser = new Parser(lexer);
parser.Eat(TokenType.IF); // Mismatched token type
}
[TestMethod]
[Description("Test ParseSimpleExpr handles variable references")]
public void ParseSimpleExpr_VariableReference_ReturnsVarReferenceNode()
{
var lexer = new Lexer("@varName");
var parser = new Parser(lexer);
var result = parser.ParseExpression();
Assert.IsInstanceOfType(result, typeof(VarReference));
}
[TestMethod]
[Description("Test ParseSimpleExpr handles string literals")]
public void ParseSimpleExpr_StringLiteral_ReturnsStringLiteralNode()
{
var lexer = new Lexer("\"test\"");
var parser = new Parser(lexer);
var result = parser.ParseExpression();
Assert.IsInstanceOfType(result, typeof(StringLiteral));
}
public static IEnumerable<object[]> GetParserStatementData()
{
var statementParsers = Assembly.GetAssembly(typeof(Compiler))!
.GetTypes()
.Where(t => t.CustomAttributes.Any(attr => attr.AttributeType == typeof(ParserForAttribute)))
.SelectMany(t => t.GetCustomAttributes<ParserForAttribute>().Select(attr => new
{
attr.TokenType,
ParserType = t,
attr.InputTokens,
attr.InputSeparator,
attr.HasBody,
attr.PrerequisiteToken
}));
var methodTokenTypeMap = Assembly.GetAssembly(typeof(Compiler))!
.GetTypes()
.Where(t => typeof(ILexerTokenConfig).IsAssignableFrom(t) && !t.IsAbstract && !t.IsInterface)
.Select(configType => (ILexerTokenConfig)Activator.CreateInstance(configType)!)
.SelectMany(config => config.TokenStrings)
.ToDictionary(pair => pair.Value, pair => pair.Key);
foreach (var parser in statementParsers)
{
string statement = string.Empty;
if (parser.PrerequisiteToken != null && methodTokenTypeMap.TryGetValue(parser.PrerequisiteToken.Value, out var preReqType))
{
var preReqParser = statementParsers.First(q => q.TokenType == parser.PrerequisiteToken);
statement += CreateTokenStatement(preReqType!, preReqParser.InputTokens, preReqParser.InputSeparator, preReqParser.HasBody);
}
if (methodTokenTypeMap.TryGetValue(parser.TokenType, out var type))
{
statement += CreateTokenStatement(type!, parser.InputTokens, parser.InputSeparator, parser.HasBody);
}
if (!string.IsNullOrWhiteSpace(statement))
{
yield return new object[]
{
parser.TokenType,
parser.ParserType,
statement
};
}
}
}
public static string DisplayParserData(MethodInfo methodInfo, object[] data)
{
return data.Length > 1 ? $"{data[0]} ({(data[1] as Type)!.Name})" : string.Join(", ", data);
}
private static string CreateTokenStatement(string tokenStatement, short inputTokens, string inputSeparator, bool hasBody)
{
var statement = tokenStatement;
if (inputTokens > 0)
{
statement += "(";
List<string> statementInputTokens = [];
for (int i = 0; i < inputTokens; i++)
{
statementInputTokens.Add($"@INPUT{i}");
}
statement += string.Join(inputSeparator, statementInputTokens);
statement += ")";
}
if (hasBody)
{
statement += "{}";
}
return statement;
}
}
}
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