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import sys
from globals import *
import srclexer
class MacroParser(object):
def __init__ (self, buf):
self.buffer = buf
self.macro = None
self.debug = False
def parse (self):
"""
A macro with arguments must have its open paren immediately following
its name without any whitespace.
"""
if self.debug:
print "-"*68
print "parsing '%s'"%self.buffer
i = 0
bufSize = len(self.buffer)
name, buf = '', ''
while i < bufSize:
c = self.buffer[i]
if c in [' ', "\t"] and len(name) == 0:
# This is a simple macro with no arguments.
name = buf
vars = []
content = self.buffer[i:]
self.setMacro(name, vars, content)
return
elif c == '(' and len(name) == 0:
# This one has arguments.
name = buf
buf = self.buffer[i:]
vars, content = self.parseArgs(buf)
self.setMacro(name, vars, content)
return
else:
buf += c
i += 1
def parseArgs (self, buffer):
"""Parse arguments.
The buffer is expected to be formatted like '(a, b, c)' where the first
character is the open paren.
"""
scope = 0
buf = ''
vars = []
content = ''
bufSize = len(buffer)
i = 0
while i < bufSize:
c = buffer[i]
if c == '(':
scope += 1
elif c == ')':
scope -= 1
if len(buf) > 0:
vars.append(buf)
if scope == 0:
break
elif c == ',':
if len(buf) == 0:
raise globals.ParseError ('')
vars.append(buf)
buf = ''
elif c in " \t" and scope > 0:
pass
else:
buf += c
i += 1
if scope > 0:
raise globals.ParseError ('')
return vars, buffer[i+1:]
def setMacro (self, name, vars, content):
if self.debug:
print "-"*68
print "name: %s"%name
for var in vars:
print "var: %s"%var
if len(vars) == 0:
print "no vars"
print "content: '%s'"%content
if len(content) > 0:
self.macro = Macro(name)
for i in xrange(0, len(vars)):
self.macro.vars[vars[i]] = i
# tokinize it using lexer.
mclexer = srclexer.SrcLexer(content)
mclexer.expandHeaders = False
mclexer.inMacroDefine = True
mclexer.tokenize()
self.macro.tokens = mclexer.getTokens()
if self.debug:
print self.macro.tokens
if not self.isValidMacro(self.macro):
self.macro = None
if self.debug:
if self.macro != None:
print "macro registered!"
else:
print "macro not registered"
def isValidMacro (self, macro):
n = len(macro.tokens)
if n == 0:
return False
elif len(macro.name) > 4 and macro.name[1:4] == 'ID_':
# We don't want to expand macros like HID_, SID_, WID_, etc.
return False
return True
def getMacro (self):
return self.macro
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