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RainCode includes a patch mechanism, which aims at performing automated modifications on large amounts of source code. The patch mechanism is a natural extension of the compliance facilities of RainCode. After finding a non-compliant construct, in many cases, the source code can be corrected automatically.

Even if the compliance rule which is violated cannot be corrected automatically, the patch mechanism can be used to insert an error message in the source file, and thereby, invalidate it for compilation until the problem that caused RainCode to complain has been corrected.

The patch mechanism is versatile and convenient:

  • It provides high-level facilities to delete, replace or move entire sub-trees of the parse tree.

  • It can be used in a line-oriented fashion, as well as a character by character fashion, whatever is more convenient.

  • It maintains a list of patches that are applied when the patched version is written back to disk, so that line and column positions are not altered by previous line insertions or deletions.



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