Update indentedGrammarExample.py to use indentedBlock

Remove confusing example tagCapture.py

1 files changed, 10 insertions, 34 deletions

diff --git a/src/examples/indentedGrammarExample.py b/src/examples/indentedGrammarExample.py
index f96524a..442e6a4 100644
--- a/src/examples/indentedGrammarExample.py
+++ b/src/examples/indentedGrammarExample.py
@@ -1,10 +1,12 @@
 # indentedGrammarExample.py

 #

-# Copyright (c) 2006, Paul McGuire

+# Copyright (c) 2006,2016  Paul McGuire

 #

 # A sample of a pyparsing grammar using indentation for 

 # grouping (like Python does).

 #

+# Updated to use indentedBlock helper method.

+#

 

 from pyparsing import *

 

@@ -29,41 +31,14 @@ def spam(x,y):
          pass

 """

 

-indentStack = [1]

-

-def checkPeerIndent(s,l,t):

-    curCol = col(l,s)

-    if curCol != indentStack[-1]:

-        if (not indentStack) or curCol > indentStack[-1]:

-            raise ParseFatalException(s,l,"illegal nesting")

-        raise ParseException(s,l,"not a peer entry")

-

-def checkSubIndent(s,l,t):

-    curCol = col(l,s)

-    if curCol > indentStack[-1]:

-        indentStack.append( curCol )

-    else:

-        raise ParseException(s,l,"not a subentry")

-

-def checkUnindent(s,l,t):

-    if l >= len(s): return

-    curCol = col(l,s)

-    if not(curCol < indentStack[-1] and curCol <= indentStack[-2]):

-        raise ParseException(s,l,"not an unindent")

-

-def doUnindent():

-    indentStack.pop()

-    

-INDENT = lineEnd.suppress() + empty + empty.copy().setParseAction(checkSubIndent)

-UNDENT = FollowedBy(empty).setParseAction(checkUnindent)

-UNDENT.setParseAction(doUnindent)

 

+indentStack = [1]

 stmt = Forward()

-suite = Group( OneOrMore( empty + stmt.setParseAction( checkPeerIndent ) )  )

+suite = indentedBlock(stmt, indentStack)

 

 identifier = Word(alphas, alphanums)

 funcDecl = ("def" + identifier + Group( "(" + Optional( delimitedList(identifier) ) + ")" ) + ":")

-funcDef = Group( funcDecl + INDENT + suite + UNDENT )

+funcDef = Group( funcDecl + suite )

 

 rvalue = Forward()

 funcCall = Group(identifier + "(" + Optional(delimitedList(rvalue)) + ")")

@@ -71,8 +46,9 @@ rvalue << (funcCall | identifier | Word(nums))
 assignment = Group(identifier + "=" + rvalue)

 stmt << ( funcDef | assignment | identifier )

 

+module_body = OneOrMore(stmt)

+

 print(data)

-parseTree = suite.parseString(data)

+parseTree = module_body.parseString(data)

+parseTree.pprint()

 

-import pprint

-pprint.pprint( parseTree.asList() )