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use super::super::types::{FunctionInfo, StructureInfo, StructureType, Visibility};
use super::LanguageAnalyzer;
use crate::utils::errors::Result;
/// R language complexity analyzer
pub struct RAnalyzer;
impl RAnalyzer {
pub fn new() -> Self {
Self
}
/// Extract function name from R function declaration
fn extract_function_name(&self, line: &str) -> Option<String> {
let trimmed = line.trim();
// Skip comments and empty lines
if trimmed.starts_with("#") || trimmed.is_empty() {
return None;
}
// Look for function assignment patterns: name <- function(...)
if trimmed.contains("<-") && trimmed.contains("function(") {
if let Some(assign_pos) = trimmed.find("<-") {
let func_name = trimmed[..assign_pos].trim();
if !func_name.is_empty()
&& func_name
.chars()
.all(|c| c.is_alphanumeric() || c == '_' || c == '.')
{
return Some(func_name.to_string());
}
}
}
// Look for function assignment patterns: name = function(...)
if trimmed.contains("=") && trimmed.contains("function(") {
if let Some(assign_pos) = trimmed.find("=") {
let func_name = trimmed[..assign_pos].trim();
if !func_name.is_empty()
&& func_name
.chars()
.all(|c| c.is_alphanumeric() || c == '_' || c == '.')
{
return Some(func_name.to_string());
}
}
}
None
}
/// Count complexity keywords in R code
fn count_complexity_keywords(&self, line: &str) -> usize {
let keywords = [
"if", "else", "for", "while", "repeat", "switch", "ifelse", "&", "|", "&&", "||", "!",
"any", "all", "which", "try", "tryCatch", "stop", "warning", "next", "break",
];
keywords
.iter()
.map(|&keyword| line.matches(keyword).count())
.sum()
}
/// Count cognitive complexity for R 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 ") || line.contains("if(") {
complexity += nesting_multiplier;
}
if line.contains("else") {
complexity += 1;
}
if line.contains("for ") || line.contains("for(") {
complexity += nesting_multiplier;
}
if line.contains("while ") || line.contains("while(") {
complexity += nesting_multiplier;
}
if line.contains("repeat") {
complexity += nesting_multiplier;
}
if line.contains("switch(") {
complexity += nesting_multiplier;
}
// Vectorized conditional
if line.contains("ifelse(") {
complexity += 1;
}
// Logical operators
complexity += line.matches("&&").count() * nesting_multiplier;
complexity += line.matches("||").count() * nesting_multiplier;
complexity += line.matches("&").count(); // Vectorized AND
complexity += line.matches("|").count(); // Vectorized OR
// Exception handling
if line.contains("try(") {
complexity += 1;
}
if line.contains("tryCatch(") {
complexity += nesting_multiplier;
}
if line.contains("stop(") {
complexity += 1;
}
if line.contains("warning(") {
complexity += 1;
}
// Control flow
if line.contains("next") {
complexity += 1;
}
if line.contains("break") {
complexity += 1;
}
// R-specific complexity patterns
if line.contains("apply(")
|| line.contains("lapply(")
|| line.contains("sapply(")
|| line.contains("mapply(")
{
complexity += 1;
}
// Data manipulation complexity
if line.contains("subset(") {
complexity += 1;
}
if line.contains("merge(") {
complexity += 1;
}
if line.contains("aggregate(") {
complexity += 1;
}
// Statistical model complexity
if line.contains("lm(")
|| line.contains("glm(")
|| line.contains("aov(")
|| line.contains("t.test(")
{
complexity += 1;
}
// Complex data access patterns
if line.contains("[[") || line.contains("$") {
complexity += 1;
}
complexity
}
/// Check if line contains a function declaration
fn is_function_declaration(&self, line: &str) -> bool {
let trimmed = line.trim();
// Skip comments and empty lines
if trimmed.starts_with("#") || trimmed.is_empty() {
return false;
}
// Must contain assignment and function keyword
(trimmed.contains("<-") || trimmed.contains("=")) && trimmed.contains("function(")
}
/// Count parameters in function signature
fn count_parameters(&self, line: &str) -> usize {
if let Some(func_pos) = line.find("function(") {
let after_func = &line[func_pos + 9..];
if let Some(end) = after_func.find(')') {
let params = &after_func[..end];
if params.trim().is_empty() {
return 0;
}
// Count parameters by commas, handling nested structures
let mut param_count = 1;
let mut paren_depth = 0;
let mut bracket_depth = 0;
let mut brace_depth = 0;
for ch in params.chars() {
match ch {
'(' => paren_depth += 1,
')' => paren_depth -= 1,
'[' => bracket_depth += 1,
']' => bracket_depth -= 1,
'{' => brace_depth += 1,
'}' => brace_depth -= 1,
',' if paren_depth == 0 && bracket_depth == 0 && brace_depth == 0 => {
param_count += 1;
}
_ => {}
}
}
return param_count;
}
}
0
}
/// Determine visibility (R doesn't have formal visibility)
fn get_visibility(&self, line: &str) -> Visibility {
// In R, functions starting with . are conventionally private
if line.contains("<- .") || line.contains("= .") {
Visibility::Private
} else {
Visibility::Public
}
}
}
impl LanguageAnalyzer for RAnalyzer {
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;
for (line_num, line) in lines.iter().enumerate() {
let trimmed = line.trim();
// Skip comments and empty lines
if trimmed.starts_with("#") || trimmed.is_empty() {
continue;
}
// Function declaration detection
if self.is_function_declaration(trimmed) {
if let Some(func_name) = self.extract_function_name(trimmed) {
let param_count = self.count_parameters(trimmed);
let _visibility = self.get_visibility(trimmed);
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: false, // R functions are not methods by default
parent_class: None,
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("tryCatch(")
|| trimmed.contains("stop(")
|| trimmed.contains("warning(")
{
func.has_exception_handling = true;
}
// Count local variables (assignments within function)
if (trimmed.contains("<-") || trimmed.contains("="))
&& !trimmed.contains("function(")
&& !trimmed.contains("==")
&& !trimmed.contains("!=")
&& !trimmed.contains("<=")
&& !trimmed.contains(">=")
{
func.local_variable_count += 1;
}
}
// End of function (R functions end with closing brace)
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();
// R doesn't have formal classes in the traditional sense, but we can analyze:
// 1. S3 classes (informal)
// 2. S4 classes (formal)
// 3. R6 classes (reference classes)
// 4. Scripts as modules
// Create a default "script" structure to hold all functions
let mut script_structure = StructureInfo {
name: "R_Script".to_string(),
structure_type: StructureType::Class,
line_count: lines.len(),
start_line: 1,
end_line: lines.len(),
methods: Vec::new(),
properties: 0,
visibility: Visibility::Public,
inheritance_depth: 0,
interface_count: 0,
};
// Count global variables as properties
let mut global_vars = 0;
for (line_num, line) in lines.iter().enumerate() {
let trimmed = line.trim();
// Skip comments and empty lines
if trimmed.starts_with("#") || trimmed.is_empty() {
continue;
}
// Count global variable assignments
if (trimmed.contains("<-") || trimmed.contains("="))
&& !trimmed.contains("function(")
&& !trimmed.contains("==")
&& !trimmed.contains("!=")
&& !trimmed.contains("<=")
&& !trimmed.contains(">=")
{
global_vars += 1;
}
// Add functions to the script structure
if self.is_function_declaration(trimmed) {
if let Some(func_name) = self.extract_function_name(trimmed) {
let param_count = self.count_parameters(trimmed);
let _visibility = self.get_visibility(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: false,
parent_class: Some("R_Script".to_string()),
local_variable_count: 0,
has_recursion: false,
has_exception_handling: false,
visibility: Visibility::Public,
};
script_structure.methods.push(method_info);
}
}
}
script_structure.properties = global_vars;
structures.push(script_structure);
Ok(structures)
}
}
impl Default for RAnalyzer {
fn default() -> Self {
Self::new()
}
}