test.py

from pyparsing import Word, Literal, alphas, alphanums, stringStart, ParserElement, ZeroOrMore,OneOrMore, Forward, Dict, Group, pythonStyleComment, lineStart, lineEnd, FollowedBy, dictOf, oneOf, NotAny, Regex
import re

DEBUG=True

ce = """custom_tooltip = {
    fail_text = INVALID_RIVAL_DESC
    is_country_type = default
}
"""

annotation_label = ParserElement.suppress(lineStart) + \
    ParserElement.suppress(Literal("#")) +\
    Word(alphas)
annotation_value = oneOf("= :").suppress() +\
    Word(alphas) +\
    ParserElement.suppress(lineEnd)
    
annotation = dictOf(annotation_label, annotation_value)

comment = lineStart.suppress() + pythonStyleComment

label = Word ( alphas + "_" )

# + Literal("{").suppress()

# Defining a name
define = label + Literal ( "=" ).suppress()

block_open = Literal("{").suppress()
block_close = Literal("}").suppress()

# +"<"+"="+">"
# Nested literal?

lit = Word( alphanums + "_" )
lit.setDefaultWhitespaceChars(" \t\n")

# literal = OneOrMore( lit ).setDebug(flag=DEBUG) + lineEnd.setDebug(flag=DEBUG)

# assign_literal = literal.setDebug(flag=DEBUG)

assign_literal = Regex(r"[a-zA-Z_ ]+^")

block = Forward()

exprs = dictOf(define.setDebug(flag=DEBUG), block ^ assign_literal)

block << block_open + OneOrMore(exprs) + block_close

exprs.parseString(ce)