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Author	SHA1	Message	Date
Rob Wu	f8af4d6567	Fix preprocessor: nesting, error & tests Features / bug fixes in the preprocessor: - Add word boundary after regex for preprocessor token matching. Previously, when you mistakenly used "#ifdef" instead of "#if", the line would be parsed as a preprocessor directive (because "#ifdef" starts with "#if"), but without condition (because "def" does not start with a space). Consequently, the condition would always be false and anything between "#ifdef" and "#endif" would not be included. - Add validation and error reporting everywhere, to aid debugging. - Support nested comments (by accounting for the whole stack of conditions, instead of only the current one). - Add #elif preprocessor command. Could be used as follows: //#if !FEATURE_ENABLED //#error FEATURE_ENABLED must be set //#endif - Add #error preprocessor command. - Add end-of-line word boundary after "-->" in the comment trimmer. Otherwise the pattern would also match "-->" in the middle of a line, and incorrectly convert something like "while(i-->0)" to "while(i0)". Code health: - Add unit tests for the preprocessor (run external/builder/test.js). - Fix broken link to MDN (resolved to DXR). - Refactor to use STATE_* names instead of magic numbers (the original meaning of the numbers is preserved, with one exception). - State 3 has been split in two states, to distinguish between being in an #if and #else. This is needed to ensure that #else cannot be started without an #if.	10 years ago

Author

SHA1

Message

Date

Rob Wu

f8af4d6567

Fix preprocessor: nesting, error & tests

Features / bug fixes in the preprocessor:

- Add word boundary after regex for preprocessor token matching.
  Previously, when you mistakenly used "#ifdef" instead of "#if", the
  line would be parsed as a preprocessor directive (because "#ifdef"
  starts with "#if"), but without condition (because "def" does not
  start with a space). Consequently, the condition would always be false
  and anything between "#ifdef" and "#endif" would not be included.

- Add validation and error reporting everywhere, to aid debugging.

- Support nested comments (by accounting for the whole stack of
  conditions, instead of only the current one).

- Add #elif preprocessor command. Could be used as follows:
  //#if !FEATURE_ENABLED
  //#error FEATURE_ENABLED must be set
  //#endif

- Add #error preprocessor command.

- Add end-of-line word boundary after "-->" in the comment trimmer.
  Otherwise the pattern would also match "-->" in the middle of a line,
  and incorrectly convert something like "while(i-->0)" to "while(i0)".

Code health:

- Add unit tests for the preprocessor (run external/builder/test.js).

- Fix broken link to MDN (resolved to DXR).

- Refactor to use STATE_* names instead of magic numbers (the original
  meaning of the numbers is preserved, with one exception).

- State 3 has been split in two states, to distinguish between being in
  an #if and #else. This is needed to ensure that #else cannot be
  started without an #if.

10 years ago

1 Commits (f8af4d6567d474e9aa2b765f7de7bc439c9701fd)