Source Code for Module Ganga.Utility.strings

 1  'Utilities for string manipulation' 
 2   
 3  import re 
 4  _ident_expr = re.compile('^[a-zA-Z_][a-zA-Z0-9_]*$') 
 5   
 6 -def is_identifier(x): 
 7      'return true if a string is valid python identifier' 
 8      return bool(_ident_expr.match(x)) 
 9   
10 -def drop_spaces(x): 
11      'drop all spaces from a string, so that "this is an example " becomes "thisisanexample"' 
12      return x.replace(' ','') 
13   
14 -class ItemizedTextParagraph: 
15      """Format a paragraph with itemized text. 
16   
17      <------------------ width -------------> 
18   
19      Example: (*) 
20        (#) 
21        item1  (**)  description1 
22        (#) 
23        item2  (**)  description2 which is 
24                     very long but breaks OK 
25        (#) 
26        item3  (**) 
27   
28      (*) is a head of the paragraph 
29      (**) is a separator 
30      (#) is a line separator 
31      """ 
32 -    def __init__(self,head,width=80,separator=' ',linesep=None): 
33          self.head = head 
34          self.items = [] 
35          self.desc = [] 
36          self.width = width 
37          self.sep = separator 
38          self.linesep = linesep 
39   
40 -    def addLine(self,item,description): 
41          self.items.append(item) 
42          self.desc.append(description) 
43   
44 -    def getString(self): 
45   
46          maxitem = 0 
47          for it in self.items: 
48              if len(it) > maxitem: 
49                  maxitem = len(it) 
50   
51          indent = ' '*(len(self.head)/2) 
52   
53          buf = self.head + '\n' 
54   
55          import Ganga.Utility.external.textwrap as textwrap 
56           
57          for it,d in zip(self.items,self.desc): 
58              if not self.linesep is None: 
59                  buf += self.linesep + '\n' 
60              buf2 = '%-*s%s%s' % (maxitem,it,self.sep,d) 
61              buf += textwrap.fill(buf2,width=self.width,initial_indent=indent,subsequent_indent=' '*(maxitem+len(self.sep))+indent) + '\n' 
62   
63          return buf 
64   
65           
66       
67   
68  if __name__ == "__main__": 
69      assert(is_identifier('a')) 
70      assert(not is_identifier('1')) 
71      assert(is_identifier('a1')) 
72      assert(not is_identifier('a1 ')) 
73      assert(not is_identifier(' a')) 
74      assert(not is_identifier('a b')) 
75      assert(is_identifier('_')) 
76   
77      assert(drop_spaces(' a b c ') == 'abc') 
78      assert(drop_spaces('abc') == 'abc') 
79   
80      it = ItemizedTextParagraph('Functions:') 
81      it.addLine('dupa','jerza;fdlkdfs;lkdfkl;') 
82      it.addLine('dupaduuza','jerza;fdlkdfs;lkdfkl;') 
83      it.addLine('d','jerza;fdlkdfs;lkdfkl;') 
84   
85      print it.getString() 
86   
87      print 'strings: Test Passed OK' 
88