Update preprocessor stack. We need to handle preprocessors due to classes like this: #ifdef SWIG struct ResultDetailsPageElementExtensionPoint { #else struct ResultDetailsPageElementExtensionPoint : public Extension { #endif We make the following assumptions (
(self, line)
| 2746 | return False |
| 2747 | |
| 2748 | def UpdatePreprocessor(self, line): |
| 2749 | """Update preprocessor stack. |
| 2750 | |
| 2751 | We need to handle preprocessors due to classes like this: |
| 2752 | #ifdef SWIG |
| 2753 | struct ResultDetailsPageElementExtensionPoint { |
| 2754 | #else |
| 2755 | struct ResultDetailsPageElementExtensionPoint : public Extension { |
| 2756 | #endif |
| 2757 | |
| 2758 | We make the following assumptions (good enough for most files): |
| 2759 | - Preprocessor condition evaluates to true from #if up to first |
| 2760 | #else/#elif/#endif. |
| 2761 | |
| 2762 | - Preprocessor condition evaluates to false from #else/#elif up |
| 2763 | to #endif. We still perform lint checks on these lines, but |
| 2764 | these do not affect nesting stack. |
| 2765 | |
| 2766 | Args: |
| 2767 | line: current line to check. |
| 2768 | """ |
| 2769 | if Match(r'^\s*#\s*(if|ifdef|ifndef)\b', line): |
| 2770 | # Beginning of #if block, save the nesting stack here. The saved |
| 2771 | # stack will allow us to restore the parsing state in the #else case. |
| 2772 | self.pp_stack.append(_PreprocessorInfo(copy.deepcopy(self.stack))) |
| 2773 | elif Match(r'^\s*#\s*(else|elif)\b', line): |
| 2774 | # Beginning of #else block |
| 2775 | if self.pp_stack: |
| 2776 | if not self.pp_stack[-1].seen_else: |
| 2777 | # This is the first #else or #elif block. Remember the |
| 2778 | # whole nesting stack up to this point. This is what we |
| 2779 | # keep after the #endif. |
| 2780 | self.pp_stack[-1].seen_else = True |
| 2781 | self.pp_stack[-1].stack_before_else = copy.deepcopy(self.stack) |
| 2782 | |
| 2783 | # Restore the stack to how it was before the #if |
| 2784 | self.stack = copy.deepcopy(self.pp_stack[-1].stack_before_if) |
| 2785 | else: |
| 2786 | # TODO(unknown): unexpected #else, issue warning? |
| 2787 | pass |
| 2788 | elif Match(r'^\s*#\s*endif\b', line): |
| 2789 | # End of #if or #else blocks. |
| 2790 | if self.pp_stack: |
| 2791 | # If we saw an #else, we will need to restore the nesting |
| 2792 | # stack to its former state before the #else, otherwise we |
| 2793 | # will just continue from where we left off. |
| 2794 | if self.pp_stack[-1].seen_else: |
| 2795 | # Here we can just use a shallow copy since we are the last |
| 2796 | # reference to it. |
| 2797 | self.stack = self.pp_stack[-1].stack_before_else |
| 2798 | # Drop the corresponding #if |
| 2799 | self.pp_stack.pop() |
| 2800 | else: |
| 2801 | # TODO(unknown): unexpected #endif, issue warning? |
| 2802 | pass |
| 2803 | |
| 2804 | # TODO(unknown): Update() is too long, but we will refactor later. |
| 2805 | def Update(self, filename, clean_lines, linenum, error): |
no test coverage detected