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|
package regex
import (
"testing"
)
func TestIsLiteralPattern(t *testing.T) {
tests := []struct {
pattern string
expected bool
}{
// Literal patterns
{"ERROR", true},
{"hello world", true},
{"test123", true},
{"user@example.com", false}, // Contains @ which could be confused in some contexts
{"192.168.1.1", false}, // Contains dots
{"path/to/file", true},
{"key=value", true},
{"JSON-data", true},
{"_underscore_", true},
// Non-literal patterns (contain regex metacharacters)
{".*", false},
{"test.*", false},
{"^start", false},
{"end$", false},
{"[abc]", false},
{"a+b", false},
{"a?b", false},
{"a*b", false},
{"(group)", false},
{"a|b", false},
{"test\\d", false},
{"test{3}", false},
{"test.log", false}, // Contains dot
}
for _, tt := range tests {
t.Run(tt.pattern, func(t *testing.T) {
got := isLiteralPattern(tt.pattern)
if got != tt.expected {
t.Errorf("isLiteralPattern(%q) = %v, want %v", tt.pattern, got, tt.expected)
}
})
}
}
func TestLiteralMatching(t *testing.T) {
tests := []struct {
pattern string
text string
match bool
}{
{"ERROR", "This is an ERROR message", true},
{"ERROR", "This is an error message", false}, // Case sensitive
{"WARNING", "This is an ERROR message", false},
{"test", "testing 123", true},
{"test", "Test 123", false}, // Case sensitive
}
for _, tt := range tests {
t.Run(tt.pattern, func(t *testing.T) {
// Test with Default flag
r, err := New(tt.pattern, Default)
if err != nil {
t.Fatalf("Failed to create regex: %v", err)
}
// Verify it's detected as literal
if !r.isLiteral {
t.Errorf("Pattern %q should be detected as literal", tt.pattern)
}
// Test string matching
got := r.MatchString(tt.text)
if got != tt.match {
t.Errorf("MatchString(%q, %q) = %v, want %v", tt.pattern, tt.text, got, tt.match)
}
// Test byte matching
gotBytes := r.Match([]byte(tt.text))
if gotBytes != tt.match {
t.Errorf("Match(%q, %q) = %v, want %v", tt.pattern, tt.text, gotBytes, tt.match)
}
})
}
// Test with Invert flag
t.Run("InvertFlag", func(t *testing.T) {
r, err := New("ERROR", Invert)
if err != nil {
t.Fatalf("Failed to create regex: %v", err)
}
if !r.isLiteral {
t.Error("Pattern should be detected as literal")
}
// Should NOT match when pattern is present
if r.MatchString("This is an ERROR message") {
t.Error("Inverted match should return false when pattern is present")
}
// Should match when pattern is absent
if !r.MatchString("This is a normal message") {
t.Error("Inverted match should return true when pattern is absent")
}
})
}
func TestRegexCompatibility(t *testing.T) {
// Ensure literal matching produces same results as regex matching
patterns := []string{
"ERROR",
"WARNING",
"user123",
"test-data",
}
texts := []string{
"This is an ERROR message",
"WARNING: something happened",
"User user123 logged in",
"Processing test-data file",
"No match here",
}
for _, pattern := range patterns {
// Create literal regex
literalRegex, err := New(pattern, Default)
if err != nil {
t.Fatalf("Failed to create literal regex: %v", err)
}
// Force creation of a non-literal regex for comparison
// We'll do this by adding a harmless regex character that doesn't change the meaning
regexPattern := "(?:" + pattern + ")"
regexRegex, err := New(regexPattern, Default)
if err != nil {
t.Fatalf("Failed to create regex: %v", err)
}
// The literal version should be optimized
if !literalRegex.isLiteral {
t.Errorf("Pattern %q should be literal", pattern)
}
// The regex version should not be optimized
if regexRegex.isLiteral {
t.Errorf("Pattern %q should not be literal", regexPattern)
}
// Both should produce same match results
for _, text := range texts {
literalMatch := literalRegex.MatchString(text)
// Test specific expected matches
expectedMatch := false
switch pattern {
case "ERROR":
expectedMatch = text == "This is an ERROR message"
case "WARNING":
expectedMatch = text == "WARNING: something happened"
case "user123":
expectedMatch = text == "User user123 logged in"
case "test-data":
expectedMatch = text == "Processing test-data file"
}
if literalMatch != expectedMatch {
t.Errorf("Pattern %q matching text %q: got %v, want %v", pattern, text, literalMatch, expectedMatch)
}
}
}
}
func TestSerializationWithLiteral(t *testing.T) {
// Test that serialization preserves literal optimization hint
r, err := New("ERROR", Default)
if err != nil {
t.Fatalf("Failed to create regex: %v", err)
}
if !r.isLiteral {
t.Error("Pattern should be detected as literal")
}
// Serialize
serialized, err := r.Serialize()
if err != nil {
t.Fatalf("Failed to serialize: %v", err)
}
// Should contain literal flag
if !contains(serialized, "literal") {
t.Errorf("Serialized form should contain 'literal' flag: %s", serialized)
}
// Deserialize
deserialized, err := Deserialize(serialized)
if err != nil {
t.Fatalf("Failed to deserialize: %v", err)
}
// Should still be literal
if !deserialized.isLiteral {
t.Error("Deserialized regex should maintain literal flag")
}
// Should match the same
testStr := "This is an ERROR message"
if r.MatchString(testStr) != deserialized.MatchString(testStr) {
t.Error("Original and deserialized regex should produce same match results")
}
}
// Helper function since we can't use strings.Contains in the regex package
func contains(s, substr string) bool {
for i := 0; i <= len(s)-len(substr); i++ {
if s[i:i+len(substr)] == substr {
return true
}
}
return false
}
|
