strs_tools 0.45.0

//! Compile-time pattern optimization examples demonstrating macro-generated optimized code.
//!
//! This example shows how compile-time analysis can generate highly optimized
//! string processing code tailored to specific patterns and usage scenarios.

#![ allow( unexpected_cfgs ) ]

#[ allow( unused_imports ) ]
use strs_tools :: *;

// Note: optimize_split and optimize_match macros are not yet implemented

fn main() 
{
  println!( "=== Compile-Time Pattern Optimization Examples ===" );
  
  // Note: Compile-time optimization features disabled - macros not yet implemented
  println!( "ℹ️  Compile-time optimization examples disabled" );
  println!( "   The optimize_split! and optimize_match! macros are prototype features" );
  println!( "   These would demonstrate compile-time pattern analysis and code generation" );
  
  #[ cfg( not( feature = "compile_time_optimizations" ) ) ]
  {
  println!( "Compile-time optimizations disabled. Enable with --features compile_time_optimizations" );
 }
}

/// Demonstrate single character delimiter optimization
#[ cfg( feature = "never_enabled" ) ]
#[ allow( dead_code ) ]
fn single_character_optimization() 
{
  println!( "\n--- Single Character Optimization ---" );
  
  let csv_data = "name,age,city,country,email,phone";
  
  // Compile-time optimized comma splitting
  let optimized_result: Vec< _ > = optimize_split!( csv_data, "," ).collect();
  
  println!( "CSV data: '{}'", csv_data );
  println!( "Optimized split result: " );
  for ( i, segment ) in optimized_result.iter().enumerate() 
  {
  println!( "  [{}] : '{}'", i, segment.as_str() );
 }
  
  // The macro generates highly optimized code for single-character delimiters
  // equivalent to the most efficient splitting algorithm for commas
  println!( "✓ Compile-time optimization: Single character delimiter" );
}

/// Demonstrate multi-delimiter optimization
#[ cfg( feature = "never_enabled" ) ]
#[ allow( dead_code ) ]
fn multi_delimiter_optimization() 
{
  println!( "\n--- Multi-Delimiter Optimization ---" );
  
  let structured_data = "field1: value1;field2: value2,field3: value3";
  
  // Compile-time analysis chooses optimal algorithm for these specific delimiters
  let optimized_result: Vec< _ > = optimize_split!( 
  structured_data, 
  [" : ", ";", ","],
  preserve_delimiters = true,
  use_simd = true
 ).collect();
  
  println!( "Structured data: '{}'", structured_data );
  println!( "Multi-delimiter optimized result: " );
  for ( i, segment ) in optimized_result.iter().enumerate() 
  {
  let segment_type =  match segment.segment_type 
  {
   strs_tools ::string ::zero_copy ::SegmentType ::Content => "Content",
   strs_tools ::string ::zero_copy ::SegmentType ::Delimiter => "Delimiter",
 };
  println!( "  [{}] : '{}' ({})", i, segment.as_str(), segment_type );
 }
  
  println!( "✓ Compile-time optimization: Multi-delimiter with SIMD" );
}

/// Demonstrate pattern matching optimization
#[ cfg( feature = "never_enabled" ) ]
#[ allow( dead_code ) ]
fn pattern_matching_optimization() 
{
  println!( "\n--- Pattern Matching Optimization ---" );
  
  let urls = [
  "https: //example.com/path",
  "http: //test.org/file",
  "ftp: //files.site.com/data",
  "file: ///local/path",
 ];
  
  for url in &urls 
  {
  // Compile-time generated trie or state machine for protocol matching
  let match_result = optimize_match!( 
   url, 
   ["https: //", "http: //", "ftp: //", "file: //"],
   strategy = "first_match"
 );
  
  println!( "URL: '{}' -> Match at position: {:?}", url, match_result );
 }
  
  println!( "✓ Compile-time optimization: Pattern matching with trie" );
}

/// Compare compile-time vs runtime optimization performance
#[ cfg( feature = "never_enabled" ) ]
#[ allow( dead_code ) ]
fn performance_comparison() 
{
  println!( "\n--- Performance Comparison ---" );
  
  let large_csv = "field1,field2,field3,field4,field5,field6,field7,field8".repeat( 1000 );
  
  use std ::time ::Instant;
  
  // Runtime optimization
  let start = Instant ::now();
  let mut runtime_count = 0;
  for _ in 0..100 
  {
  let result: Vec< _ > = large_csv
   .split( ',' )
   .collect();
  runtime_count += result.len();
 }
  let runtime_duration = start.elapsed();
  
  // Compile-time optimization
  let start = Instant ::now();
  let mut compile_time_count = 0;
  for _ in 0..100 
  {
  let result: Vec< _ > = optimize_split!( large_csv.as_str(), "," ).collect();
  compile_time_count += result.len();
 }
  let compile_time_duration = start.elapsed();
  
  println!( "Processing {} characters of CSV data (100 iterations) : ", large_csv.len() );
  println!( "Runtime optimization: {:?} ({} segments)", runtime_duration, runtime_count );
  println!( "Compile-time optimization: {:?} ({} segments)", compile_time_duration, compile_time_count );
  
  if compile_time_duration < runtime_duration 
  {
  let speedup = runtime_duration.as_secs_f64() / compile_time_duration.as_secs_f64();
  println!( "Speedup: {:.2}x faster with compile-time optimization", speedup );
 }
  
  assert_eq!( runtime_count, compile_time_count );
  println!( "✓ Results verified identical" );
}

/// Advanced example: Compile-time regex-like pattern optimization
#[ cfg( feature = "never_enabled" ) ]
#[ allow( dead_code ) ]
fn _advanced_pattern_optimization() 
{
  println!( "\n--- Advanced Pattern Optimization ---" );
  
  let log_entries = [
  "2025-01-15 14 : 30 : 25 ERROR Failed to connect",
  "2025-01-15 14 : 30 : 26 INFO Connection established",
  "2025-01-15 14 : 30 : 27 WARN High memory usage",
  "2025-01-15 14 : 30 : 28 DEBUG Processing request",
 ];
  
  for entry in &log_entries 
  {
  // The macro analyzes the pattern and generates optimal parsing code
  let timestamp_match = optimize_match!( 
   entry,
   [r"\d{4}-\d{2}-\d{2} \d{2} : \d{2} : \d{2}"],
   strategy = "first_match"
 );
  
  let level_match = optimize_match!(
   entry,
   ["ERROR", "WARN", "INFO", "DEBUG"],
   strategy = "first_match"
 );
  
  println!( "Log entry: {}", entry );
  println!( "  Timestamp match: {:?}", timestamp_match );
  println!( "  Log level match: {:?}", level_match );
 }
  
  println!( "✓ Advanced pattern optimization demonstrated" );
}