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| author | Cengiz Kaygusuz <cngkaygusuz@gmail.com> | 2017-11-20 20:46:39 -0500 |
|---|---|---|
| committer | Cengiz Kaygusuz <cngkaygusuz@gmail.com> | 2017-11-20 20:46:39 -0500 |
| commit | 27e183a78c8062ed7c2bbb91655a5e56cd697bba (patch) | |
| tree | 88fd355a0cc6da4c130582e092d702836596cbb2 /examples/stackish.py | |
| parent | 4ba589cf13588e90992e23deb5a9784340efd2cc (diff) | |
| download | pyparsing-git-27e183a78c8062ed7c2bbb91655a5e56cd697bba.tar.gz | |
Move src to root
Diffstat (limited to 'examples/stackish.py')
| -rw-r--r-- | examples/stackish.py | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/examples/stackish.py b/examples/stackish.py new file mode 100644 index 0000000..f80b4d6 --- /dev/null +++ b/examples/stackish.py @@ -0,0 +1,81 @@ +# stackish.py
+#
+# Stackish is a data representation syntax, similar to JSON or YAML. For more info on
+# stackish, see http://www.savingtheinternetwithhate.com/stackish.html
+#
+# Copyright 2008, Paul McGuire
+#
+
+"""
+NUMBER A simple integer type that's just any series of digits.
+FLOAT A simple floating point type.
+STRING A string is double quotes with anything inside that's not a " or
+ newline character. You can include \n and \" to include these
+ characters.
+MARK Marks a point in the stack that demarcates the boundary for a nested
+ group.
+WORD Marks the root node of a group, with the other end being the nearest
+ MARK.
+GROUP Acts as the root node of an anonymous group.
+ATTRIBUTE Assigns an attribute name to the previously processed node.
+ This means that just about anything can be an attribute, unlike in XML.
+BLOB A BLOB is unique to Stackish and allows you to record any content
+ (even binary content) inside the structure. This is done by pre-
+ sizing the data with the NUMBER similar to Dan Bernstein's netstrings
+ setup.
+SPACE White space is basically ignored. This is interesting because since
+ Stackish is serialized consistently this means you can use \n as the
+ separation character and perform reasonable diffs on two structures.
+"""
+
+from pyparsing import Suppress,Word,nums,alphas,alphanums,Combine,oneOf,\
+ Optional,QuotedString,Forward,Group,ZeroOrMore,printables,srange
+
+MARK,UNMARK,AT,COLON,QUOTE = map(Suppress,"[]@:'")
+
+NUMBER = Word(nums)
+NUMBER.setParseAction(lambda t:int(t[0]))
+FLOAT = Combine(oneOf("+ -") + Word(nums) + "." + Optional(Word(nums)))
+FLOAT.setParseAction(lambda t:float(t[0]))
+STRING = QuotedString('"', multiline=True)
+WORD = Word(alphas,alphanums+"_:")
+ATTRIBUTE = Combine(AT + WORD)
+
+strBody = Forward()
+def setBodyLength(tokens):
+ strBody << Word(srange(r'[\0x00-\0xffff]'), exact=int(tokens[0]))
+ return ""
+BLOB = Combine(QUOTE + Word(nums).setParseAction(setBodyLength) +
+ COLON + strBody + QUOTE)
+
+item = Forward()
+def assignUsing(s):
+ def assignPA(tokens):
+ if s in tokens:
+ tokens[tokens[s]] = tokens[0]
+ del tokens[s]
+ return assignPA
+GROUP = (MARK +
+ Group( ZeroOrMore(
+ (item +
+ Optional(ATTRIBUTE)("attr")
+ ).setParseAction(assignUsing("attr"))
+ )
+ ) +
+ ( WORD("name") | UNMARK )
+ ).setParseAction(assignUsing("name"))
+item << (NUMBER | FLOAT | STRING | BLOB | GROUP )
+
+tests = """\
+[ '10:1234567890' @name 25 @age +0.45 @percentage person:zed
+[ [ "hello" 1 child root
+[ "child" [ 200 '4:like' "I" "hello" things root
+[ [ "data" [ 2 1 ] @numbers child root
+[ [ 1 2 3 ] @test 4 5 6 root
+""".splitlines()
+
+for test in tests:
+ if test:
+ print(test)
+ print(item.parseString(test).dump())
+ print()
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