Parser.py

   1 #!/usr/bin/python
   2
   3 import sys
   4
   5 lines = sys.stdin.read().rstrip('\n').split('\n')
   6
   7 def data(line):
   8     name = line[0].replace('&', 'Ampersand').replace('^', 'Carrot').replace('=', 'Equal').replace('!', 'Exclamation').replace('-', 'Hyphen').replace('<', 'Left').replace('%', 'Percent').replace('.', 'Period').replace('|', 'Pipe').replace('+', 'Plus').replace('>', 'Right').replace('/', 'Slash').replace('*', 'Star').replace('~', 'Tilde')
   9     text = line[0].lower()
  10     word = text[0].isalpha()
  11     prefix = None if line[1] == '-' else line[1]
  12     assign = None if len(line) < 3 or line[2] != 'A' else '' if len(line) < 4 else line[3]
  13     infix = None if len(line) < 3 or line[2] != 'R' else line[3]
  14     precedence = line[4] if infix != None and len(line) > 4 else None
  15     postfix = infix if infix != None and precedence == None else None
  16     if postfix != None:
  17         infix = None
  18     return name, text, word, prefix, assign, infix, precedence, postfix
  19
  20 def express(expression, type, args, call):
  21     print 'struct CYExpression%(expression)s :' % locals()
  22     print '    CYExpression%(type)s' % locals()
  23     print '{'
  24     print '    CYExpression%(expression)s(%(args)s) :' % locals()
  25     print '        CYExpression%(type)s(%(call)s)' % locals()
  26     print '    {'
  27     print '    }'
  28     print '};'
  29     print
  30
  31 for line in lines:
  32     line = line.split()
  33     name, text, word, prefix, assign, infix, precedence, postfix = data(line)
  34
  35     print 'struct CYToken%(name)s :' % locals()
  36     if prefix != None:
  37         print '    CYTokenPrefix,'
  38     if infix != None:
  39         print '    CYTokenInfix,'
  40     if postfix != None:
  41         print '    CYTokenPostfix,'
  42     if assign != None:
  43         print '    CYTokenAssignment,'
  44     if word:
  45         print '    CYTokenWord,'
  46     print '    virtual CYToken'
  47     print '{'
  48     print '    virtual const char *Text() const {'
  49     print '        return "%(text)s";' % locals()
  50     print '    }'
  51     if precedence != None or prefix != None or assign != None or infix != None:
  52         print
  53     if precedence != None:
  54         print '    virtual unsigned Precedence() const {'
  55         print '        return %(precedence)s;' % locals()
  56         print '    }'
  57         print
  58     if prefix != None:
  59         print '    virtual CYExpression *PrefixExpression(apr_pool_t *pool, CYExpression *rhs) const;'
  60     if infix != None:
  61         print '    virtual CYExpression *InfixExpression(apr_pool_t *pool, CYExpression *lhs, CYExpression *rhs) const;'
  62     if postfix != None:
  63         print '    virtual CYExpression *PostfixExpression(apr_pool_t *pool, CYExpression *lhs) const;'
  64     if assign != None:
  65         print '    virtual CYExpression *AssignmentExpression(apr_pool_t *pool, CYExpression *lhs, CYExpression *rhs) const;'
  66     print '};'
  67     print
  68     if prefix != None:
  69         express(prefix, 'Prefix', 'CYExpression *rhs', 'rhs')
  70     if infix != None:
  71         express(infix, 'Infix', 'CYExpression *lhs, CYExpression *rhs', 'lhs, rhs')
  72     if postfix != None:
  73         express(postfix, 'Postfix', 'CYExpression *lhs', 'lhs')
  74     if assign != None:
  75         express('Assign' + assign, 'Assignment', 'CYExpression *lhs, CYExpression *rhs', 'lhs, rhs')
  76
  77 for line in lines:
  78     line = line.split()
  79     name, text, word, prefix, assign, infix, precedence, postfix = data(line)
  80
  81     if prefix != None:
  82         print 'CYExpression *CYToken%(name)s::PrefixExpression(apr_pool_t *pool, CYExpression *rhs) const {' % locals()
  83         print '    return new(pool) CYExpression%(prefix)s(rhs);' % locals()
  84         print '}'
  85         print
  86     if infix != None:
  87         print 'CYExpression *CYToken%(name)s::InfixExpression(apr_pool_t *pool, CYExpression *lhs, CYExpression *rhs) const {' % locals()
  88         print '    return new(pool) CYExpression%(infix)s(lhs, rhs);' % locals()
  89         print '}'
  90         print
  91     if postfix != None:
  92         print 'CYExpression *CYToken%(name)s::PostfixExpression(apr_pool_t *pool, CYExpression *rhs) const {' % locals()
  93         print '    return new(pool) CYExpression%(postfix)s(rhs);' % locals()
  94         print '}'
  95         print
  96     if assign != None:
  97         print 'CYExpression *CYToken%(name)s::AssignmentExpression(apr_pool_t *pool, CYExpression *lhs, CYExpression *rhs) const {' % locals()
  98         print '    return new(pool) CYExpressionAssign%(assign)s(lhs, rhs);' % locals()
  99         print '}'
 100         print