| 41 | ############################################################################### |
| 42 | |
| 43 | class BetterNode(object): |
| 44 | def __init__(self, name, children=[], semicolon=False): |
| 45 | self.name = name |
| 46 | self.children = children |
| 47 | self.semicolon = semicolon |
| 48 | |
| 49 | def gen(self, extra=''): |
| 50 | # leaf nodes (no possible descent) |
| 51 | if self.name == 'ident': |
| 52 | tmp = (self.children[0] + extra).replace('.', '_') |
| 53 | if not tmp.startswith('FIELD_'): |
| 54 | tmp = 'FIELD_' + tmp |
| 55 | code = 'res->fields[%s]' % tmp |
| 56 | elif self.name == 'rawtext': |
| 57 | code = self.children[0] |
| 58 | elif self.name == 'number': |
| 59 | code = self.children[0] |
| 60 | elif self.name == 'bits': |
| 61 | code = '0x%X' % int(self.children[0], 2) |
| 62 | elif self.name == 'see': |
| 63 | code = '\nmemset(res, 0, sizeof(*res));' |
| 64 | code = '\nreturn %s(req, res);' % self.children[0] |
| 65 | self.semicolon = 0 |
| 66 | else: |
| 67 | subCode = map(lambda x: x.gen(), self.children) |
| 68 | subCode = tuple(subCode) |
| 69 | |
| 70 | # binary operations translate directly to C |
| 71 | if self.name == 'xor': |
| 72 | assert len(self.children) == 2 |
| 73 | code = '(%s) ^ (%s)' % subCode |
| 74 | elif self.name == 'add': |
| 75 | assert len(self.children) == 2 |
| 76 | code = '(%s) + (%s)' % subCode |
| 77 | elif self.name == 'sub': |
| 78 | assert len(self.children) == 2 |
| 79 | code = '(%s) - (%s)' % subCode |
| 80 | elif self.name == 'less_than': |
| 81 | assert len(self.children) == 2 |
| 82 | code = '(%s) < (%s)' % subCode |
| 83 | elif self.name == 'greater_than': |
| 84 | assert len(self.children) == 2 |
| 85 | code = '(%s) > (%s)' % subCode |
| 86 | elif self.name == 'log_and': |
| 87 | assert len(self.children) == 2 |
| 88 | code = '(%s) && (%s)' % subCode |
| 89 | elif self.name == 'log_or': |
| 90 | assert len(self.children) == 2 |
| 91 | code = '(%s) || (%s)' % subCode |
| 92 | elif self.name == 'log_not': |
| 93 | assert len(self.children) == 1 |
| 94 | code = '!(%s)' % subCode |
| 95 | elif self.name == 'equals': |
| 96 | assert len(self.children) == 2 |
| 97 | code = '(%s) == (%s)' % subCode |
| 98 | elif self.name == 'not_equals': |
| 99 | assert len(self.children) == 2 |
| 100 | code = '(%s) != (%s)' % subCode |