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.
It took a while to figure out why adding comments in worker_loader.js
caused the build to fail, because getWorkerSrcFiles did not print an
error message when it failed to parse the file. These issues have been
resolved as follows:
- Leading comments are stripped.
- The trailing comma is removed from the array.
- Errors are detected and useful error messages are printed.
There is no need to have a copy of ShellJS in the repository as it is also available on NPM. The NPM version is also much newer. This way we do not have to update this anymore and let NPM do that automatically.
