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use super::super::types::{FunctionInfo, StructureInfo, StructureType, Visibility};
use super::LanguageAnalyzer;
use crate::utils::errors::Result;
/// Java language complexity analyzer
pub struct JavaAnalyzer;
impl JavaAnalyzer {
pub fn new() -> Self {
Self
}
/// Extract function name from Java method declaration
fn extract_function_name(&self, line: &str) -> Option<String> {
// Handle various Java method patterns
let trimmed = line.trim();
// Look for method patterns: public/private/protected/static/final void/int/String methodName(
if let Some(paren_pos) = trimmed.find('(') {
// Find the method name by working backwards from the parenthesis
let before_paren = &trimmed[..paren_pos];
let parts: Vec<&str> = before_paren.split_whitespace().collect();
if parts.len() >= 2 {
// Last part should be the method name
let method_name = parts.last().unwrap();
// Skip constructors and operators
if !method_name.starts_with(char::is_uppercase) && !method_name.contains('<') {
return Some(method_name.to_string());
}
}
}
None
}
/// Extract class name from Java class declaration
fn extract_class_name(&self, line: &str) -> Option<String> {
let trimmed = line.trim();
// Look for class/interface/enum declarations
if let Some(start) = trimmed
.find("class ")
.or_else(|| trimmed.find("interface "))
.or_else(|| trimmed.find("enum "))
{
let keyword_end = if trimmed[start..].starts_with("class") {
start + 6
} else if trimmed[start..].starts_with("interface") {
start + 10
} else {
start + 5
}; // enum
let after_keyword = &trimmed[keyword_end..];
let parts: Vec<&str> = after_keyword.split_whitespace().collect();
if let Some(name) = parts.first() {
// Remove generic type parameters if present
if let Some(generic_start) = name.find('<') {
return Some(name[..generic_start].to_string());
} else {
return Some(name.to_string());
}
}
}
None
}
/// Count complexity keywords in Java code
fn count_complexity_keywords(&self, line: &str) -> usize {
let keywords = [
"if", "else if", "while", "for", "do", "switch", "case", "catch", "&&", "||", "?",
];
keywords
.iter()
.map(|&keyword| line.matches(keyword).count())
.sum()
}
/// Count cognitive complexity for Java code
fn count_cognitive_complexity(&self, line: &str, nesting_level: usize) -> usize {
let mut complexity = 0;
let nesting_multiplier = nesting_level.max(1);
// Basic control structures
if line.contains("if ") {
complexity += nesting_multiplier;
}
if line.contains("else if") {
complexity += 1;
}
if line.contains("else") && !line.contains("else if") {
complexity += 1;
}
if line.contains("while ") {
complexity += nesting_multiplier;
}
if line.contains("for ") {
complexity += nesting_multiplier;
}
if line.contains("do ") {
complexity += nesting_multiplier;
}
if line.contains("switch ") {
complexity += nesting_multiplier;
}
if line.contains("case ") {
complexity += 1;
}
if line.contains("catch ") {
complexity += nesting_multiplier;
}
if line.contains("finally") {
complexity += 1;
}
// Logical operators
complexity += line.matches("&&").count() * nesting_multiplier;
complexity += line.matches("||").count() * nesting_multiplier;
// Ternary operator
complexity += line.matches("?").count() * nesting_multiplier;
// Lambda expressions add complexity
if line.contains("->") {
complexity += 1;
}
complexity
}
/// Check if line contains a method declaration
fn is_method_declaration(&self, line: &str) -> bool {
let trimmed = line.trim();
// Skip comments and empty lines
if trimmed.starts_with("//") || trimmed.starts_with("/*") || trimmed.is_empty() {
return false;
}
// Must contain parentheses for parameters
if !trimmed.contains('(') {
return false;
}
// Common method patterns
let method_keywords = [
"public",
"private",
"protected",
"static",
"final",
"abstract",
"synchronized",
];
let has_modifier = method_keywords
.iter()
.any(|&keyword| trimmed.contains(keyword));
// Check for return types
let return_types = [
"void", "int", "String", "boolean", "double", "float", "long", "char", "byte", "short",
];
let has_return_type = return_types.iter().any(|&rtype| trimmed.contains(rtype));
// Generic return types or custom types
let has_generic_or_custom = trimmed.contains('<')
|| (trimmed.contains('(') && trimmed.split_whitespace().count() >= 2);
has_modifier || has_return_type || has_generic_or_custom
}
/// Check if line contains a class/interface/enum declaration
fn is_structure_declaration(&self, line: &str) -> bool {
let trimmed = line.trim();
trimmed.contains("class ") || trimmed.contains("interface ") || trimmed.contains("enum ")
}
/// Count parameters in method signature
fn count_parameters(&self, line: &str) -> usize {
if let Some(start) = line.find('(') {
if let Some(end) = line.find(')') {
let params = &line[start + 1..end];
if params.trim().is_empty() {
return 0;
}
// Count commas + 1, but be careful of generics
let mut paren_depth = 0;
let mut angle_depth = 0;
let mut param_count = 1;
for ch in params.chars() {
match ch {
'(' => paren_depth += 1,
')' => paren_depth -= 1,
'<' => angle_depth += 1,
'>' => angle_depth -= 1,
',' if paren_depth == 0 && angle_depth == 0 => param_count += 1,
_ => {}
}
}
return param_count;
}
}
0
}
/// Determine structure type from declaration
fn get_structure_type(&self, line: &str) -> StructureType {
if line.contains("class ") {
StructureType::Class
} else if line.contains("interface ") {
StructureType::Interface
} else if line.contains("enum ") {
StructureType::Enum
} else {
StructureType::Struct // Default fallback
}
}
/// Determine visibility from modifiers
fn get_visibility(&self, line: &str) -> Visibility {
if line.contains("public") {
Visibility::Public
} else if line.contains("private") {
Visibility::Private
} else if line.contains("protected") {
Visibility::Protected
} else {
Visibility::Internal // Java package-private
}
}
}
impl LanguageAnalyzer for JavaAnalyzer {
fn analyze_functions(&self, lines: &[String]) -> Result<Vec<FunctionInfo>> {
let mut functions = Vec::new();
let mut current_function: Option<FunctionInfo> = None;
let mut brace_count = 0;
let mut in_function = false;
let mut nesting_level: usize = 0;
let mut current_class: Option<String> = None;
for (line_num, line) in lines.iter().enumerate() {
let trimmed = line.trim();
// Skip comments and empty lines
if trimmed.starts_with("//") || trimmed.starts_with("/*") || trimmed.is_empty() {
continue;
}
// Track current class for method context
if self.is_structure_declaration(trimmed) {
current_class = self.extract_class_name(trimmed);
}
// Method declaration detection
if self.is_method_declaration(trimmed) {
if let Some(func_name) = self.extract_function_name(trimmed) {
let param_count = self.count_parameters(trimmed);
let is_method = current_class.is_some();
current_function = Some(FunctionInfo {
name: func_name,
line_count: 0,
cyclomatic_complexity: 1, // Base complexity
cognitive_complexity: 1, // Base cognitive complexity
nesting_depth: 0,
parameter_count: param_count,
return_path_count: 0,
start_line: line_num + 1,
end_line: line_num + 1,
is_method,
parent_class: current_class.clone(),
local_variable_count: 0,
has_recursion: false,
has_exception_handling: false,
visibility: Visibility::Public,
});
in_function = true;
brace_count = 0;
nesting_level = 0;
}
}
if in_function {
// Count braces to track function scope
brace_count += line.matches('{').count() as i32;
brace_count -= line.matches('}').count() as i32;
// Track nesting level
if line.contains('{') {
nesting_level += 1;
}
if line.contains('}') {
nesting_level = nesting_level.saturating_sub(1);
}
if let Some(ref mut func) = current_function {
func.line_count += 1;
func.end_line = line_num + 1;
func.nesting_depth = func.nesting_depth.max(nesting_level);
// Add complexity from keywords
let keyword_complexity = self.count_complexity_keywords(trimmed);
func.cyclomatic_complexity += keyword_complexity;
// Add cognitive complexity
let cognitive_complexity =
self.count_cognitive_complexity(trimmed, nesting_level);
func.cognitive_complexity += cognitive_complexity;
// Count return statements
if trimmed.contains("return") {
func.return_path_count += 1;
}
// Check for recursion
if trimmed.contains(&func.name) && trimmed.contains('(') {
func.has_recursion = true;
}
// Check for exception handling
if trimmed.contains("try")
|| trimmed.contains("catch")
|| trimmed.contains("throw")
{
func.has_exception_handling = true;
}
// Rough estimate of local variables
if trimmed.contains("int ")
|| trimmed.contains("String ")
|| trimmed.contains("boolean ")
|| trimmed.contains("double ")
|| trimmed.contains("float ")
|| trimmed.contains("long ")
{
func.local_variable_count += 1;
}
}
// End of function
if brace_count <= 0 && in_function {
if let Some(func) = current_function.take() {
functions.push(func);
}
in_function = false;
nesting_level = 0;
}
}
}
Ok(functions)
}
fn analyze_structures(&self, lines: &[String]) -> Result<Vec<StructureInfo>> {
let mut structures = Vec::new();
let mut current_structure: Option<StructureInfo> = None;
let mut brace_count = 0;
let mut in_structure = false;
for (line_num, line) in lines.iter().enumerate() {
let trimmed = line.trim();
// Skip comments and empty lines
if trimmed.starts_with("//") || trimmed.starts_with("/*") || trimmed.is_empty() {
continue;
}
// Structure declaration detection
if self.is_structure_declaration(trimmed) {
if let Some(struct_name) = self.extract_class_name(trimmed) {
let structure_type = self.get_structure_type(trimmed);
let visibility = self.get_visibility(trimmed);
current_structure = Some(StructureInfo {
name: struct_name,
structure_type,
line_count: 0,
start_line: line_num + 1,
end_line: line_num + 1,
methods: Vec::new(),
properties: 0,
visibility,
inheritance_depth: 0,
interface_count: 0,
});
in_structure = true;
brace_count = 0;
}
}
if in_structure {
// Count braces to track structure scope
brace_count += line.matches('{').count() as i32;
brace_count -= line.matches('}').count() as i32;
if let Some(ref mut structure) = current_structure {
structure.line_count += 1;
structure.end_line = line_num + 1;
// Count properties (field declarations)
if (trimmed.contains("private ")
|| trimmed.contains("public ")
|| trimmed.contains("protected "))
&& !trimmed.contains('(')
&& trimmed.contains(';')
{
structure.properties += 1;
}
// Count method declarations within the structure
if self.is_method_declaration(trimmed) {
if let Some(func_name) = self.extract_function_name(trimmed) {
let param_count = self.count_parameters(trimmed);
let method_info = FunctionInfo {
name: func_name,
line_count: 0, // Would need separate tracking
cyclomatic_complexity: 1,
cognitive_complexity: 1,
nesting_depth: 0,
parameter_count: param_count,
return_path_count: 0,
start_line: line_num + 1,
end_line: line_num + 1,
is_method: true,
parent_class: Some(structure.name.clone()),
local_variable_count: 0,
has_recursion: false,
has_exception_handling: false,
visibility: Visibility::Public,
};
structure.methods.push(method_info);
}
}
// Count implemented interfaces
if trimmed.contains("implements ") {
let after_implements = trimmed.split("implements ").nth(1).unwrap_or("");
let interfaces = after_implements.split(',').count();
structure.interface_count += interfaces;
}
// Estimate inheritance depth
if trimmed.contains("extends ") {
structure.inheritance_depth = 1; // Simplified
}
}
// End of structure
if brace_count <= 0 && in_structure {
if let Some(structure) = current_structure.take() {
structures.push(structure);
}
in_structure = false;
}
}
}
Ok(structures)
}
}
impl Default for JavaAnalyzer {
fn default() -> Self {
Self::new()
}
}