dartpetitparser

Ignore escaped multi-line quotes

I want to parse a GraphQL document using Dart PetitParser. To be able to support BlockString (multi-line string) I'm looking for a way to get

from 

"""
abc
\"""
def
"""

this part out

abc
\"""
def

Full syntax https://facebook.github.io/graphql/draft/#sec-String-Value

Solution

  • I am on a mobile Phone and I don't have a computer to test, but something along these lines should work:

    string('"""') & (string(r'\"""') | any()).starLazy(string('"""')) & string('"""')

    This parses the triple quotes, followed by any sequence of the escaped triple quotes or other characters, until we reach the ending triple quotes. Possibly you want to also add a .flatten() to the inner part to get a plain string as return value.