| Rich Lane | a06d0c3 | 2013-03-25 08:52:03 -0700 | [diff] [blame] | 1 | # Copyright 2013, Big Switch Networks, Inc. |
| 2 | # |
| 3 | # LoxiGen is licensed under the Eclipse Public License, version 1.0 (EPL), with |
| 4 | # the following special exception: |
| 5 | # |
| 6 | # LOXI Exception |
| 7 | # |
| 8 | # As a special exception to the terms of the EPL, you may distribute libraries |
| 9 | # generated by LoxiGen (LoxiGen Libraries) under the terms of your choice, provided |
| 10 | # that copyright and licensing notices generated by LoxiGen are not altered or removed |
| 11 | # from the LoxiGen Libraries and the notice provided below is (i) included in |
| 12 | # the LoxiGen Libraries, if distributed in source code form and (ii) included in any |
| 13 | # documentation for the LoxiGen Libraries, if distributed in binary form. |
| 14 | # |
| 15 | # Notice: "Copyright 2013, Big Switch Networks, Inc. This library was generated by the LoxiGen Compiler." |
| 16 | # |
| 17 | # You may not use this file except in compliance with the EPL or LOXI Exception. You may obtain |
| 18 | # a copy of the EPL at: |
| 19 | # |
| 20 | # http://www.eclipse.org/legal/epl-v10.html |
| 21 | # |
| 22 | # Unless required by applicable law or agreed to in writing, software |
| 23 | # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| 24 | # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| 25 | # EPL for the specific language governing permissions and limitations |
| 26 | # under the EPL. |
| 27 | |
| 28 | import pyparsing as P |
| 29 | |
| 30 | kw = P.Keyword |
| 31 | s = P.Suppress |
| 32 | lit = P.Literal |
| 33 | |
| 34 | # Useful for marking the type of a parse result (matches the empty string, but |
| 35 | # shows up in the result) |
| 36 | tag = lambda name: P.Empty().setParseAction(P.replaceWith(name)) |
| 37 | |
| 38 | word = P.Word(P.alphanums + '_') |
| 39 | |
| 40 | identifier = word.copy().setName("identifier") |
| 41 | |
| 42 | # Type names |
| 43 | scalar_type = word |
| 44 | array_type = P.Combine(word + lit('[') - P.Word(P.alphanums + '_') - lit(']')) |
| 45 | list_type = P.Combine(kw('list') - lit('(') - identifier - lit(')')) |
| 46 | any_type = (array_type | list_type | scalar_type).setName("type name") |
| 47 | |
| 48 | # Structs |
| 49 | struct_member = P.Group(any_type - identifier - s(';')) |
| 50 | struct = kw('struct') - identifier - s('{') + \ |
| 51 | P.Group(P.ZeroOrMore(struct_member)) + \ |
| 52 | s('}') - s(';') |
| 53 | |
| 54 | # Metadata |
| 55 | metadata_key = P.Or(kw("version")).setName("metadata key") |
| 56 | metadata = tag('metadata') + s('#') - metadata_key - word |
| 57 | |
| 58 | grammar = P.ZeroOrMore(P.Group(struct) | P.Group(metadata)) |
| 59 | grammar.ignore(P.cppStyleComment) |
| 60 | |
| 61 | def parse(src): |
| 62 | return grammar.parseString(src, parseAll=True) |