refactor: Extract line pattern detection to patterns.go

1 files changed, 83 insertions, 0 deletions

diff --git a/patterns.go b/patterns.go
new file mode 100644
index 0000000..5cd35ca
--- /dev/null
+++ b/patterns.go
@@ -0,0 +1,83 @@
+package main
+
+import "regexp"
+
+var (
+	closingBracePattern = regexp.MustCompile(`^\s*[\}\)]`)
+	openingBracePattern = regexp.MustCompile(`[\{\(]\s*$`)
+	caseLabelPattern    = regexp.MustCompile(`^\s*(case\s|default\s*:)|(^\s+.*:\s*$)`)
+)
+
+func isCommentOnly(sourceLine string) bool {
+	for characterIndex := range len(sourceLine) {
+		character := sourceLine[characterIndex]
+
+		if character == ' ' || character == '\t' {
+			continue
+		}
+
+		return len(sourceLine) > characterIndex+1 && sourceLine[characterIndex] == '/' && sourceLine[characterIndex+1] == '/'
+	}
+
+	return false
+}
+
+func isPackageLine(trimmedLine string) bool {
+	return len(trimmedLine) > 8 && trimmedLine[:8] == "package "
+}
+
+func countRawStringDelimiters(sourceLine string) int {
+	delimiterCount := 0
+	insideDoubleQuotedString := false
+	insideCharacterLiteral := false
+
+	for characterIndex := 0; characterIndex < len(sourceLine); characterIndex++ {
+		character := sourceLine[characterIndex]
+
+		if insideCharacterLiteral {
+			if character == '\\' && characterIndex+1 < len(sourceLine) {
+				characterIndex++
+
+				continue
+			}
+
+			if character == '\'' {
+				insideCharacterLiteral = false
+			}
+
+			continue
+		}
+
+		if insideDoubleQuotedString {
+			if character == '\\' && characterIndex+1 < len(sourceLine) {
+				characterIndex++
+
+				continue
+			}
+
+			if character == '"' {
+				insideDoubleQuotedString = false
+			}
+
+			continue
+		}
+
+		if character == '\'' {
+			insideCharacterLiteral = true
+
+			continue
+		}
+
+		if character == '"' {
+			insideDoubleQuotedString = true
+
+			continue
+		}
+
+		if character == '`' {
+			delimiterCount++
+		}
+	}
+
+	return delimiterCount
+}