Example of complex string pattern matching with bosatsu

pattern.bosatsu

  1 package PatternExamples                                  
  2                                                
  3 foo = "this is foo"
  4 bar = "this is bar"                        
  5                                          
  6 combine = "foo: ${foo} bar: ${bar}"               
  7                                                                   
  8 def operator ==(a, b):                                   
  9     match string_Order_fn(a, b):                                                       
 10         EQ: True                                                                 
 11         _: False                       
 12                                
 13 def operator &&(a, b):                                              
 14     if a: b       
 15     else: False                             
 16      
 17 fb = match combine:                                 
 18     "foo: ${f} bar: ${b}":  
 19         (f == foo) && (b == bar)           
 20     _: False                                                  
 21                          
 22 test = Assertion(fb, "foo-bar match")