c13cc88262
Reserved word detection as it was implemented in the JavaScript example
grammar had two big downsides:
1. It required changes in ordering of choices in some rules in order
not to trigger the detection prematurely. One of the changes was
already implemented (in the |Statement| rule, see the diff), but
apparently more were needed (the grammar didn't parse inputs like
|true| or |function f() {}|). And I'm not 100% sure that would be
the end of it (maybe deeper structural changes would be needed).
2. It made error messages confusing. Consider the following example:
var a = @;
Instead of reporting:
Expected ... but "@" found.
the generated parser reported:
Reserved word "var" can't be used as an identifier.
This was because the parser parsed the statement first as
|VariableStatement| and when this failed, it tried to parse it as
|ExpressionStatement|, triggering the reserved word detection.
Because of these, I decided to remove reserved word detection from the
JavaScript example grammar.
|
||
|---|---|---|
| .. | ||
| arithmetics.pegjs | ||
| css.pegjs | ||
| javascript.pegjs | ||
| json.pegjs | ||