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# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at:
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import cgi, pyparsing as pp
# Some useful primitives
ident = pp.Word(pp.alphas + "_", pp.alphas + pp.nums + "_")
intNum = pp.Word(pp.nums)
hexNum = pp.Literal("0x") + pp.Word(pp.hexnums)
octalNum = pp.Literal("0") + pp.Word("01234567")
integer = (hexNum | octalNum | intNum) + \
pp.Optional(pp.Literal("ULL") | pp.Literal("LL") | pp.Literal("L"))
floatNum = pp.Regex(r'\d+(\.\d*)?([eE]\d+)?') + pp.Optional(pp.Literal("f"))
char = pp.Literal("'") + pp.Word(pp.printables, exact=1) + pp.Literal("'")
arrayIndex = integer | ident
lbracket = pp.Literal("(").suppress()
rbracket = pp.Literal(")").suppress()
lbrace = pp.Literal("{").suppress()
rbrace = pp.Literal("}").suppress()
comma = pp.Literal(",").suppress()
equals = pp.Literal("=").suppress()
dot = pp.Literal(".").suppress()
semicolon = pp.Literal(";").suppress()
# initializer := { [member = ] (variable | expression | { initializer } ) }
typeName = ident
varName = ident
typeSpec = pp.Optional("unsigned") + \
pp.oneOf("int long short float double char u8 i8 void") + \
pp.Optional(pp.Word("*"), default="")
typeCast = pp.Combine( "(" + ( typeSpec | typeName ) + ")" ).suppress()
string = pp.Combine(pp.OneOrMore(pp.QuotedString(quoteChar='"',
escChar='\\', multiline=True)), adjacent=False)
literal = pp.Optional(typeCast) + (integer | floatNum | char | string)
var = pp.Combine(pp.Optional(typeCast) + varName +
pp.Optional("[" + arrayIndex + "]"))
# This could be more complete, but suffices for our uses
expr = (literal | var)
"""Parse and render a block of text into a Python dictionary."""
class Parser(object):
"""Compiled PyParsing BNF"""
_parser = None
def __init__(self):
super(Parser, self).__init__()
self._parser = self.BNF()
def BNF(self):
raise NotImplementedError
def item(self, item):
raise NotImplementedError
def parse(self, input):
item = self._parser.parseString(input).asList()
return self.item(item)
"""Parser for function-like macros - without the closing semi-colon."""
class ParserFunctionMacro(Parser):
def BNF(self):
# VLIB_CONFIG_FUNCTION (unix_config, "unix")
macroName = ident
params = pp.Group(pp.ZeroOrMore(expr + comma) + expr)
macroParams = lbracket + params + rbracket
return macroName + macroParams
def item(self, item):
r = {
"macro": item[0],
"name": item[1][1],
"function": item[1][0],
}
return r
"""Parser for function-like macros with a closing semi-colon."""
class ParseFunctionMacroStmt(ParserFunctionMacro):
def BNF(self):
# VLIB_CONFIG_FUNCTION (unix_config, "unix");
function_macro = super(ParseFunctionMacroStmt, self).BNF()
mi = function_macro + semicolon
mi.ignore(pp.cppStyleComment)
return mi
"""
Parser for our struct initializers which are composed from a
function-like macro, equals sign, and then a normal C struct initalizer
block.
"""
class MacroInitializer(ParserFunctionMacro):
def BNF(self):
# VLIB_CLI_COMMAND (show_sr_tunnel_command, static) = {
# .path = "show sr tunnel",
# .short_help = "show sr tunnel [name <sr-tunnel-name>]",
# .function = show_sr_tunnel_fn,
# };
cs = pp.Forward()
member = pp.Combine(dot + varName + pp.Optional("[" + arrayIndex + "]"),
adjacent=False)
value = (expr | cs)
entry = pp.Group(pp.Optional(member + equals, default="") + value)
entries = (pp.ZeroOrMore(entry + comma) + entry + pp.Optional(comma)) | \
(pp.ZeroOrMore(entry + comma))
cs << (lbrace + entries + rbrace)
macroName = ident
params = pp.Group(pp.ZeroOrMore(expr + comma) + expr)
macroParams = lbracket + params + rbracket
function_macro = super(MacroInitializer, self).BNF()
mi = function_macro + equals + pp.Group(cs) + semicolon
mi.ignore(pp.cppStyleComment)
return mi
def item(self, item):
r = {
"macro": item[0],
"name": item[1][0],
"params": item[2],
"value": {},
}
for param in item[2]:
r["value"][param[0]] = cgi.escape(param[1])
return r
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