On Fri, 5 Jul 2024 at 10:39, Rafael Luque <rafael.luque.leiva@gmail.com> wrote:
Hi all,
I'm struggling with a small parser using PetitParser2. Here is a fragment of some of the rules I'm defining but their behaviour is not as I could expect:
andKeyword := 'and' asPParser trim, #letter asPParser not. notKeyword := 'not' asPParser trim, #letter asPParser not. keyword := andKeyword / notKeyword. nonKeywordIdentifier := keyword not, #letter asPParser, #word asPParser star. word := nonKeywordIdentifier, #blank asPParser star. words := word star.
The behaviour of the "nonKeywordIdentifier" is the expected:
identifier end parse: 'hello'. "It parses successfully" identifier end parse: 'and'. "It fails as 'and' is a keyword"
However the "words" rule's behavior is the following:
words end parse: 'hello Pharo'. "It parses successfully" words end parse: 'hello and bye'. "It parses, when I would expect it fails because of 'and' is a keyword"
I don't understand why the "words" rule works this way, but I'm starting with PetitParser. Any suggestions?
Thank you.
You might consider asking on stackoverflow. A PetitParser2 question has been answered there recently. -- Frank Church =======================