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#
# matchPreviousDemo.py
#
from pyparsing import *
src = """
class a
...
end a;
class b
...
end b;
class c
...
end d;"""
identifier = Word(alphas)
classIdent = identifier("classname") # note that this also makes a copy of identifier
classHead = "class" + classIdent
classBody = "..."
classEnd = "end" + matchPreviousLiteral(classIdent) + ';'
classDefn = classHead + classBody + classEnd
# use this form to catch syntax error
# classDefn = classHead + classBody - classEnd
for tokens in classDefn.searchString(src):
print(tokens.classname)
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