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using DotPython.Language.Syntax;
using DotPython.Language.Text;
using Xunit;
namespace DotPython.ParserTests;
public sealed class PythonTokenizerTests
{
[Fact]
public void Tokenize_RecognizesNamesNumbersAndOperators()
{
const string code = "if café := .5 + 0xCA_FE ** 2j: ...";
var result = Tokenize(code);
Assert.Empty(result.Diagnostics);
Assert.Equal(
[
SyntaxTokenKind.Identifier,
SyntaxTokenKind.Identifier,
SyntaxTokenKind.ColonEqual,
SyntaxTokenKind.FloatLiteral,
SyntaxTokenKind.Plus,
SyntaxTokenKind.IntegerLiteral,
SyntaxTokenKind.DoubleStar,
SyntaxTokenKind.ImaginaryLiteral,
SyntaxTokenKind.Colon,
SyntaxTokenKind.Ellipsis,
SyntaxTokenKind.NewLine,
SyntaxTokenKind.EndOfFile,
],
result.Tokens.Select(token => token.Kind)
);
Assert.Equal("if", result.Tokens[0].Text);
Assert.Equal("café", result.Tokens[1].Text);
Assert.Equal("", result.Tokens[^2].Text);
}
[Fact]
public void Tokenize_PrefersLongestExactOperator()
{
const string code =
"== != <= >= << >> ** // := -> += -= *= /= %= &= |= ^= <<= >>= **= //= @=";
var result = Tokenize(code);
Assert.Empty(result.Diagnostics);
Assert.Equal(
[
SyntaxTokenKind.EqualEqual,
SyntaxTokenKind.NotEqual,
SyntaxTokenKind.LessThanOrEqual,
SyntaxTokenKind.GreaterThanOrEqual,
SyntaxTokenKind.LeftShift,
SyntaxTokenKind.RightShift,
SyntaxTokenKind.DoubleStar,
SyntaxTokenKind.DoubleSlash,
SyntaxTokenKind.ColonEqual,
SyntaxTokenKind.Arrow,
SyntaxTokenKind.PlusEqual,
SyntaxTokenKind.MinusEqual,
SyntaxTokenKind.StarEqual,
SyntaxTokenKind.SlashEqual,
SyntaxTokenKind.PercentEqual,
SyntaxTokenKind.AmpersandEqual,
SyntaxTokenKind.VerticalBarEqual,
SyntaxTokenKind.CaretEqual,
SyntaxTokenKind.LeftShiftEqual,
SyntaxTokenKind.RightShiftEqual,
SyntaxTokenKind.DoubleStarEqual,
SyntaxTokenKind.DoubleSlashEqual,
SyntaxTokenKind.AtEqual,
SyntaxTokenKind.NewLine,
SyntaxTokenKind.EndOfFile,
],
result.Tokens.Select(token => token.Kind)
);
}
[Fact]
public void Tokenize_EmitsIndentAndDedentAroundLogicalLines()
{
const string code = "if ready:\n\tvalue = 1\nvalue = 2";
var result = Tokenize(code);
Assert.Empty(result.Diagnostics);
Assert.Equal(1, result.Tokens.Count(token => token.Kind == SyntaxTokenKind.Indent));
Assert.Equal(1, result.Tokens.Count(token => token.Kind == SyntaxTokenKind.Dedent));
Assert.Equal(
"\t",
result.Tokens.Single(token => token.Kind == SyntaxTokenKind.Indent).Text
);
var dedent = result.Tokens.Single(token => token.Kind == SyntaxTokenKind.Dedent);
Assert.Equal(0, dedent.Span.Length);
Assert.Equal(code.LastIndexOf("value", StringComparison.Ordinal), dedent.Span.Start);
}
[Fact]
public void Tokenize_DistinguishesNonSignificantPhysicalNewLines()
{
const string code = "# heading\n\nvalue = (\n 1\n)\n";
var result = Tokenize(code);
Assert.Empty(result.Diagnostics);
Assert.Equal(
4,
result.Tokens.Count(token => token.Kind == SyntaxTokenKind.NonSignificantNewLine)
);
Assert.Equal(1, result.Tokens.Count(token => token.Kind == SyntaxTokenKind.NewLine));
Assert.DoesNotContain(result.Tokens, token => token.Kind == SyntaxTokenKind.Indent);
}
[Fact]
public void Tokenize_DeletesExplicitLineJoiningPair()
{
const string code = "value = 1 + \\\r\n 2";
var result = Tokenize(code);
Assert.Empty(result.Diagnostics);
Assert.DoesNotContain(
result.Tokens,
token => token.Kind == SyntaxTokenKind.NonSignificantNewLine
);
Assert.DoesNotContain(result.Tokens, token => token.Kind == SyntaxTokenKind.Indent);
Assert.Equal(2, result.Tokens.Count(token => token.Kind == SyntaxTokenKind.IntegerLiteral));
}
[Fact]
public void Tokenize_RecognizesPython314StringPrefixesAndTripleQuotes()
{
const string code = """
'a' r"b" b'c' f"{value["key"]}" t'item {x}' '''multi
line'''
""";
var result = Tokenize(code);
Assert.Empty(result.Diagnostics);
Assert.Equal(
[
SyntaxTokenKind.StringLiteral,
SyntaxTokenKind.StringLiteral,
SyntaxTokenKind.BytesLiteral,
SyntaxTokenKind.FormattedStringLiteral,
SyntaxTokenKind.TemplateStringLiteral,
SyntaxTokenKind.StringLiteral,
],
result
.Tokens.Where(token =>
token.Kind
is SyntaxTokenKind.StringLiteral
or SyntaxTokenKind.BytesLiteral
or SyntaxTokenKind.FormattedStringLiteral
or SyntaxTokenKind.TemplateStringLiteral
)
.Select(token => token.Kind)
);
}
[Fact]
public void Tokenize_ReportsMalformedNumbersWithoutStoppingRecovery()
{
const string code = "1__2 0b102 1e+ valid";
var result = Tokenize(code);
Assert.Equal(3, result.Diagnostics.Count(diagnostic => diagnostic.Code == "DPY1006"));
Assert.Contains(result.Tokens, token => token.Text == "valid");
Assert.Equal(SyntaxTokenKind.EndOfFile, result.Tokens[^1].Kind);
}
[Fact]
public void Tokenize_ReportsAmbiguousTabsAndSpaces()
{
const string code = "if ready:\n\tpass\n pass\n";
var result = Tokenize(code);
var diagnostic = Assert.Single(result.Diagnostics);
Assert.Equal("DPY1003", diagnostic.Code);
Assert.Equal(8, diagnostic.Span.Length);
}
[Fact]
public void Tokenize_ReportsUnmatchedDedentAndContinues()
{
const string code = "if first:\n if second:\n pass\n pass\n";
var result = Tokenize(code);
Assert.Contains(result.Diagnostics, diagnostic => diagnostic.Code == "DPY1002");
Assert.Equal(2, result.Tokens.Count(token => token.Kind == SyntaxTokenKind.Dedent));
Assert.Equal(SyntaxTokenKind.EndOfFile, result.Tokens[^1].Kind);
}
[Theory]
[InlineData("'unterminated", "DPY1007")]
[InlineData("(value", "DPY1005")]
[InlineData("value ]", "DPY1004")]
[InlineData("value $ other", "DPY1001")]
[InlineData("\0", "DPY1001")]
public void Tokenize_ProducesStructuredDiagnosticsForInvalidInput(
string code,
string expectedCode
)
{
var result = Tokenize(code);
Assert.Contains(result.Diagnostics, diagnostic => diagnostic.Code == expectedCode);
Assert.Equal(SyntaxTokenKind.EndOfFile, result.Tokens[^1].Kind);
}
[Fact]
public void Tokenize_EmptySourceContainsOnlyEndMarker()
{
var result = Tokenize(string.Empty);
Assert.Empty(result.Diagnostics);
var token = Assert.Single(result.Tokens);
Assert.Equal(SyntaxTokenKind.EndOfFile, token.Kind);
Assert.Equal(new TextSpan(0, 0), token.Span);
}
private static TokenizationResult Tokenize(string code) =>
PythonTokenizer.Tokenize(new SourceText(code, "test.py"));
}