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Current File : //usr/local/share/python2.5/Tools/bgen/bgen/scantools.py |
"""\ Tools for scanning header files in search of function prototypes. Often, the function prototypes in header files contain enough information to automatically generate (or reverse-engineer) interface specifications from them. The conventions used are very vendor specific, but once you've figured out what they are they are often a great help, and it sure beats manually entering the interface specifications. (These are needed to generate the glue used to access the functions from Python.) In order to make this class useful, almost every component can be overridden. The defaults are (currently) tuned to scanning Apple Macintosh header files, although most Mac specific details are contained in header-specific subclasses. """ import re import sys import os import fnmatch from types import * try: import MacOS except ImportError: MacOS = None try: from bgenlocations import CREATOR, INCLUDEDIR except ImportError: CREATOR = None INCLUDEDIR = os.curdir Error = "scantools.Error" BEGINHTMLREPORT="""<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <html> <head> <style type="text/css"> .unmatched { } .commentstripping { color: grey; text-decoration: line-through } .comment { text-decoration: line-through } .notcomment { color: black } .incomplete { color: maroon } .constant { color: green } .pyconstant { background-color: yellow } .blconstant { background-color: yellow; color: red } .declaration { color: blue } .pydeclaration { background-color: yellow } .type { font-style: italic } .name { font-weight: bold } .value { font-style: italic } .arglist { text-decoration: underline } .blacklisted { background-color: yellow; color: red } </style> <title>Bgen scan report</title> </head> <body> <h1>Bgen scan report</h1> <h2>Legend</h2> <p>This scan report is intended to help you debug the regular expressions used by the bgen scanner. It consists of the original ".h" header file(s) marked up to show you what the regular expressions in the bgen parser matched for each line. NOTE: comments in the original source files may or may not be shown.</p> <p>The typographic conventions of this file are as follows:</p> <dl> <dt>comment stripping</dt> <dd><pre><span class="commentstripping"><span class="notcomment">comment stripping is </span><span class="comment">/* marked up */</span><span class="notcomment"> and the line is repeated if needed</span></span></pre> <p>If anything here does not appear to happen correctly look at <tt>comment1_pat</tt> and <tt>comment2_pat</tt>.</p> </dd> <dt>constant definitions</dt> <dd><pre><span class="constant">#define <span class="name">name</span> <span class="value">value</span></pre> <p>Highlights name and value of the constant. Governed by <tt>sym_pat</tt>.</p> </dd> <dt>function declaration</dt> <dd><pre><span class="declaration"><span class="type">char *</span><span class="name">rindex</span><span class="arglist">(<span class="type">const char *</span><span class="name">s</span>, <span class="type">int </span><span class="name">c</span>)</span>;</span></pre> <p>Highlights type, name and argument list. <tt>type_pat</tt>, <tt>name_pat</tt> and <tt>args_pat</tt> are combined into <tt>whole_pat</tt>, which is what is used here.</p></dd> </dd> <dt>incomplete match for function declaration</dt> <dd><pre><span class="incomplete"><span class="type">char *</span>foo;</span></pre> <p>The beginning of this looked promising, but it did not match a function declaration. In other words, it matched <tt>head_pat</tt> but not <tt>whole_pat</tt>. If the next declaration has also been gobbled up you need to look at <tt>end_pat</tt>.</p> </dd> <dt>unrecognized input</dt> <dd><pre><span class="unmatched">#include "type.h"</span></pre> <p>If there are function declarations the scanner has missed (i.e. things are in this class but you want them to be declarations) you need to adapt <tt>head_pat</tt>. </dd> </dl> <h2>Output</h2> <pre> <span class="unmatched"> """ ENDHTMLREPORT="""</span> </pre> </body> </html> """ class Scanner: # Set to 1 in subclass to debug your scanner patterns. debug = 0 def __init__(self, input = None, output = None, defsoutput = None): self.initsilent() self.initblacklists() self.initrepairinstructions() self.initpaths() self.initfiles() self.initpatterns() self.compilepatterns() self.initosspecifics() self.initusedtypes() if output: self.setoutput(output, defsoutput) if input: self.setinput(input) def initusedtypes(self): self.usedtypes = {} def typeused(self, type, mode): if not self.usedtypes.has_key(type): self.usedtypes[type] = {} self.usedtypes[type][mode] = None def reportusedtypes(self): types = self.usedtypes.keys() types.sort() for type in types: modes = self.usedtypes[type].keys() modes.sort() self.report("%s %s", type, " ".join(modes)) def gentypetest(self, file): fp = open(file, "w") fp.write("types=[\n") types = self.usedtypes.keys() types.sort() for type in types: fp.write("\t'%s',\n"%type) fp.write("]\n") fp.write("""missing=0 for t in types: try: tt = eval(t) except NameError: print "** Missing type:", t missing = 1 if missing: raise "Missing Types" """) fp.close() def initsilent(self): self.silent = 1 def error(self, format, *args): if self.silent >= 0: print format%args def report(self, format, *args): if not self.silent: print format%args def writeinitialdefs(self): pass def initblacklists(self): self.blacklistnames = self.makeblacklistnames() self.blacklisttypes = ["unknown", "-"] + self.makeblacklisttypes() self.greydictnames = self.greylist2dict(self.makegreylist()) def greylist2dict(self, list): rv = {} for define, namelist in list: for name in namelist: rv[name] = define return rv def makeblacklistnames(self): return [] def makeblacklisttypes(self): return [] def makegreylist(self): return [] def initrepairinstructions(self): self.repairinstructions = self.makerepairinstructions() self.inherentpointertypes = self.makeinherentpointertypes() def makerepairinstructions(self): """Parse the repair file into repair instructions. The file format is simple: 1) use \ to split a long logical line in multiple physical lines 2) everything after the first # on a line is ignored (as comment) 3) empty lines are ignored 4) remaining lines must have exactly 3 colon-separated fields: functionpattern : argumentspattern : argumentsreplacement 5) all patterns use shell style pattern matching 6) an empty functionpattern means the same as * 7) the other two fields are each comma-separated lists of triples 8) a triple is a space-separated list of 1-3 words 9) a triple with less than 3 words is padded at the end with "*" words 10) when used as a pattern, a triple matches the type, name, and mode of an argument, respectively 11) when used as a replacement, the words of a triple specify replacements for the corresponding words of the argument, with "*" as a word by itself meaning leave the original word (no other uses of "*" is allowed) 12) the replacement need not have the same number of triples as the pattern """ f = self.openrepairfile() if not f: return [] print "Reading repair file", repr(f.name), "..." list = [] lineno = 0 while 1: line = f.readline() if not line: break lineno = lineno + 1 startlineno = lineno while line[-2:] == '\\\n': line = line[:-2] + ' ' + f.readline() lineno = lineno + 1 i = line.find('#') if i >= 0: line = line[:i] words = [s.strip() for s in line.split(':')] if words == ['']: continue if len(words) <> 3: print "Line", startlineno, print ": bad line (not 3 colon-separated fields)" print repr(line) continue [fpat, pat, rep] = words if not fpat: fpat = "*" if not pat: print "Line", startlineno, print "Empty pattern" print repr(line) continue patparts = [s.strip() for s in pat.split(',')] repparts = [s.strip() for s in rep.split(',')] patterns = [] for p in patparts: if not p: print "Line", startlineno, print "Empty pattern part" print repr(line) continue pattern = p.split() if len(pattern) > 3: print "Line", startlineno, print "Pattern part has > 3 words" print repr(line) pattern = pattern[:3] else: while len(pattern) < 3: pattern.append("*") patterns.append(pattern) replacements = [] for p in repparts: if not p: print "Line", startlineno, print "Empty replacement part" print repr(line) continue replacement = p.split() if len(replacement) > 3: print "Line", startlineno, print "Pattern part has > 3 words" print repr(line) replacement = replacement[:3] else: while len(replacement) < 3: replacement.append("*") replacements.append(replacement) list.append((fpat, patterns, replacements)) return list def makeinherentpointertypes(self): return [] def openrepairfile(self, filename = "REPAIR"): try: return open(filename, "rU") except IOError, msg: print repr(filename), ":", msg print "Cannot open repair file -- assume no repair needed" return None def initfiles(self): self.specmine = 0 self.defsmine = 0 self.scanmine = 0 self.htmlmine = 0 self.specfile = sys.stdout self.defsfile = None self.scanfile = sys.stdin self.htmlfile = None self.lineno = 0 self.line = "" def initpaths(self): self.includepath = [os.curdir, INCLUDEDIR] def initpatterns(self): self.head_pat = r"^EXTERN_API[^_]" self.tail_pat = r"[;={}]" self.type_pat = r"EXTERN_API" + \ r"[ \t\n]*\([ \t\n]*" + \ r"(?P<type>[a-zA-Z0-9_* \t]*[a-zA-Z0-9_*])" + \ r"[ \t\n]*\)[ \t\n]*" self.name_pat = r"(?P<name>[a-zA-Z0-9_]+)[ \t\n]*" self.args_pat = r"\((?P<args>([^\(;=\)]+|\([^\(;=\)]*\))*)\)" self.whole_pat = self.type_pat + self.name_pat + self.args_pat self.sym_pat = r"^[ \t]*(?P<name>[a-zA-Z0-9_]+)[ \t]*=" + \ r"[ \t]*(?P<defn>[-0-9_a-zA-Z'\"\(][^\t\n,;}]*),?" self.asplit_pat = r"^(?P<type>.*[^a-zA-Z0-9_])(?P<name>[a-zA-Z0-9_]+)(?P<array>\[\])?$" self.comment1_pat = r"(?P<rest>.*)//.*" # note that the next pattern only removes comments that are wholly within one line self.comment2_pat = r"(?P<rest1>.*)/\*.*\*/(?P<rest2>.*)" def compilepatterns(self): for name in dir(self): if name[-4:] == "_pat": pat = getattr(self, name) prog = re.compile(pat) setattr(self, name[:-4], prog) def initosspecifics(self): if MacOS and CREATOR: self.filetype = 'TEXT' self.filecreator = CREATOR else: self.filetype = self.filecreator = None def setfiletype(self, filename): if MacOS and (self.filecreator or self.filetype): creator, type = MacOS.GetCreatorAndType(filename) if self.filecreator: creator = self.filecreator if self.filetype: type = self.filetype MacOS.SetCreatorAndType(filename, creator, type) def close(self): self.closefiles() def closefiles(self): self.closespec() self.closedefs() self.closescan() self.closehtml() def closespec(self): tmp = self.specmine and self.specfile self.specfile = None if tmp: tmp.close() def closedefs(self): tmp = self.defsmine and self.defsfile self.defsfile = None if tmp: tmp.close() def closescan(self): tmp = self.scanmine and self.scanfile self.scanfile = None if tmp: tmp.close() def closehtml(self): if self.htmlfile: self.htmlfile.write(ENDHTMLREPORT) tmp = self.htmlmine and self.htmlfile self.htmlfile = None if tmp: tmp.close() def setoutput(self, spec, defs = None): self.closespec() self.closedefs() if spec: if type(spec) == StringType: file = self.openoutput(spec) mine = 1 else: file = spec mine = 0 self.specfile = file self.specmine = mine if defs: if type(defs) == StringType: file = self.openoutput(defs) mine = 1 else: file = defs mine = 0 self.defsfile = file self.defsmine = mine def sethtmloutput(self, htmlfile): self.closehtml() if htmlfile: if type(htmlfile) == StringType: file = self.openoutput(htmlfile) mine = 1 else: file = htmlfile mine = 0 self.htmlfile = file self.htmlmine = mine self.htmlfile.write(BEGINHTMLREPORT) def openoutput(self, filename): try: file = open(filename, 'w') except IOError, arg: raise IOError, (filename, arg) self.setfiletype(filename) return file def setinput(self, scan = sys.stdin): if not type(scan) in (TupleType, ListType): scan = [scan] self.allscaninputs = scan self._nextinput() def _nextinput(self): if not self.allscaninputs: return 0 scan = self.allscaninputs[0] self.allscaninputs = self.allscaninputs[1:] self.closescan() if scan: if type(scan) == StringType: file = self.openinput(scan) mine = 1 else: file = scan mine = 0 self.scanfile = file self.scanmine = mine self.lineno = 0 return 1 def openinput(self, filename): if not os.path.isabs(filename): for dir in self.includepath: fullname = os.path.join(dir, filename) #self.report("trying full name %r", fullname) try: return open(fullname, 'rU') except IOError: pass # If not on the path, or absolute, try default open() try: return open(filename, 'rU') except IOError, arg: raise IOError, (arg, filename) def getline(self): if not self.scanfile: raise Error, "input file not set" self.line = self.scanfile.readline() if not self.line: if self._nextinput(): return self.getline() raise EOFError self.lineno = self.lineno + 1 return self.line def scan(self): if not self.scanfile: self.error("No input file has been specified") return inputname = self.scanfile.name self.report("scanfile = %r", inputname) if not self.specfile: self.report("(No interface specifications will be written)") else: self.report("specfile = %r", self.specfile.name) self.specfile.write("# Generated from %r\n\n" % (inputname,)) if not self.defsfile: self.report("(No symbol definitions will be written)") else: self.report("defsfile = %r", (self.defsfile.name,)) self.defsfile.write("# Generated from %r\n\n" % (os.path.split(inputname)[1],)) self.writeinitialdefs() self.alreadydone = [] try: while 1: try: line = self.getline() except EOFError: break if self.debug: self.report("LINE: %r" % (line,)) match = self.comment1.match(line) if match: self.htmlreport(line, klass='commentstripping', ranges=[( match.start('rest'), match.end('rest'), 'notcomment')]) line = match.group('rest') if self.debug: self.report("\tafter comment1: %r" % (line,)) match = self.comment2.match(line) while match: if match: self.htmlreport(line, klass='commentstripping', ranges=[ (match.start('rest1'), match.end('rest1'), 'notcomment'), (match.start('rest2'), match.end('rest2'), 'notcomment')]) line = match.group('rest1')+match.group('rest2') if self.debug: self.report("\tafter comment2: %r" % (line,)) match = self.comment2.match(line) if self.defsfile: match = self.sym.match(line) if match: if self.debug: self.report("\tmatches sym.") self.dosymdef(match, line) continue match = self.head.match(line) if match: if self.debug: self.report("\tmatches head.") self.dofuncspec() continue self.htmlreport(line, klass='unmatched') except EOFError: self.error("Uncaught EOF error") self.reportusedtypes() def dosymdef(self, match, line): name, defn = match.group('name', 'defn') self.htmlreport(line, klass='constant', ranges=[ (match.start('name'), match.end('name'), 'name'), (match.start('defn'), match.end('defn'), 'value')]) defn = escape8bit(defn) if self.debug: self.report("\tsym: name=%r, defn=%r" % (name, defn)) if not name in self.blacklistnames: oline = "%s = %s\n" % (name, defn) self.defsfile.write(oline) self.htmlreport(oline, klass="pyconstant") else: self.defsfile.write("# %s = %s\n" % (name, defn)) self.htmlreport("** no output: name is blacklisted", klass="blconstant") # XXXX No way to handle greylisted names def dofuncspec(self): raw = self.line while not self.tail.search(raw): line = self.getline() if self.debug: self.report("* CONTINUATION LINE: %r" % (line,)) match = self.comment1.match(line) if match: line = match.group('rest') if self.debug: self.report("\tafter comment1: %r" % (line,)) match = self.comment2.match(line) while match: line = match.group('rest1')+match.group('rest2') if self.debug: self.report("\tafter comment1: %r" % (line,)) match = self.comment2.match(line) raw = raw + line if self.debug: self.report("* WHOLE LINE: %r" % (raw,)) self.processrawspec(raw) return raw def processrawspec(self, raw): match = self.whole.search(raw) if not match: self.report("Bad raw spec: %r", raw) if self.debug: match = self.type.search(raw) if not match: self.report("(Type already doesn't match)") self.htmlreport(raw, klass='incomplete', ranges=[( match.start('type'), match.end('type'), 'type')]) else: self.report("(but type matched)") self.htmlreport(raw, klass='incomplete') return type, name, args = match.group('type', 'name', 'args') ranges=[ (match.start('type'), match.end('type'), 'type'), (match.start('name'), match.end('name'), 'name'), (match.start('args'), match.end('args'), 'arglist')] self.htmlreport(raw, klass='declaration', ranges=ranges) modifiers = self.getmodifiers(match) type = self.pythonizename(type) name = self.pythonizename(name) if self.checkduplicate(name): self.htmlreport("*** no output generated: duplicate name", klass="blacklisted") return self.report("==> %s %s <==", type, name) if self.blacklisted(type, name): self.htmlreport("*** no output generated: function name or return type blacklisted", klass="blacklisted") self.report("*** %s %s blacklisted", type, name) return returnlist = [(type, name, 'ReturnMode')] returnlist = self.repairarglist(name, returnlist) [(type, name, returnmode)] = returnlist arglist = self.extractarglist(args) arglist = self.repairarglist(name, arglist) if self.unmanageable(type, name, arglist): self.htmlreport("*** no output generated: some argument blacklisted", klass="blacklisted") ##for arg in arglist: ## self.report(" %r", arg) self.report("*** %s %s unmanageable", type, name) return if modifiers: self.generate(type, name, arglist, modifiers) else: self.generate(type, name, arglist) def getmodifiers(self, match): return [] def checkduplicate(self, name): if name in self.alreadydone: self.report("Name has already been defined: %r", name) return True self.alreadydone.append(name) return False def pythonizename(self, name): name = re.sub("\*", " ptr", name) name = name.strip() name = re.sub("[ \t]+", "_", name) return name def extractarglist(self, args): args = args.strip() if not args or args == "void": return [] parts = [s.strip() for s in args.split(",")] arglist = [] for part in parts: arg = self.extractarg(part) arglist.append(arg) return arglist def extractarg(self, part): mode = "InMode" part = part.strip() match = self.asplit.match(part) if not match: self.error("Indecipherable argument: %r", part) return ("unknown", part, mode) type, name, array = match.group('type', 'name', 'array') if array: # array matches an optional [] after the argument name type = type + " ptr " type = self.pythonizename(type) return self.modifyarg(type, name, mode) def modifyarg(self, type, name, mode): if type[:6] == "const_": type = type[6:] elif type[-4:] == "_ptr": type = type[:-4] mode = "OutMode" elif type in self.inherentpointertypes: mode = "OutMode" if type[-4:] == "_far": type = type[:-4] return type, name, mode def repairarglist(self, functionname, arglist): arglist = arglist[:] i = 0 while i < len(arglist): for item in self.repairinstructions: if len(item) == 2: pattern, replacement = item functionpat = "*" else: functionpat, pattern, replacement = item if not fnmatch.fnmatchcase(functionname, functionpat): continue n = len(pattern) if i+n > len(arglist): continue current = arglist[i:i+n] for j in range(n): if not self.matcharg(pattern[j], current[j]): break else: # All items of the pattern match new = self.substituteargs( pattern, replacement, current) if new is not None: arglist[i:i+n] = new i = i+len(new) # No recursive substitutions break else: # No patterns match i = i+1 return arglist def matcharg(self, patarg, arg): return len(filter(None, map(fnmatch.fnmatchcase, arg, patarg))) == 3 def substituteargs(self, pattern, replacement, old): new = [] for k in range(len(replacement)): item = replacement[k] newitem = [item[0], item[1], item[2]] for i in range(3): if item[i] == '*': newitem[i] = old[k][i] elif item[i][:1] == '$': index = int(item[i][1:]) - 1 newitem[i] = old[index][i] new.append(tuple(newitem)) ##self.report("old: %r", old) ##self.report("new: %r", new) return new def generate(self, tp, name, arglist, modifiers=[]): self.typeused(tp, 'return') if modifiers: classname, listname = self.destination(tp, name, arglist, modifiers) else: classname, listname = self.destination(tp, name, arglist) if not classname or not listname: self.htmlreport("*** no output generated: self.destination() returned None", klass="blacklisted") return if not self.specfile: self.htmlreport("*** no output generated: no output file specified", klass="blacklisted") return self.specfile.write("f = %s(%s, %r,\n" % (classname, tp, name)) for atype, aname, amode in arglist: self.typeused(atype, amode) self.specfile.write(" (%s, %r, %s),\n" % (atype, aname, amode)) if self.greydictnames.has_key(name): self.specfile.write(" condition=%r,\n"%(self.greydictnames[name],)) self.generatemodifiers(classname, name, modifiers) self.specfile.write(")\n") self.specfile.write("%s.append(f)\n\n" % listname) if self.htmlfile: oline = "Adding to %s:\n%s(returntype=%s, name=%r" % (listname, classname, tp, name) for atype, aname, amode in arglist: oline += ",\n (%s, %r, %s)" % (atype, aname, amode) oline += ")\n" self.htmlreport(oline, klass="pydeclaration") def destination(self, type, name, arglist): return "FunctionGenerator", "functions" def generatemodifiers(self, classname, name, modifiers): pass def blacklisted(self, type, name): if type in self.blacklisttypes: ##self.report("return type %s is blacklisted", type) return 1 if name in self.blacklistnames: ##self.report("function name %s is blacklisted", name) return 1 return 0 def unmanageable(self, type, name, arglist): for atype, aname, amode in arglist: if atype in self.blacklisttypes: self.report("argument type %s is blacklisted", atype) return 1 return 0 def htmlreport(self, line, klass=None, ranges=None): if not self.htmlfile: return if ranges is None: ranges = [] if klass: ranges.insert(0, (0, len(line), klass)) oline = '' i = 0 for c in line: for b, e, name in ranges: if b == i: oline += '<span class="%s">' % name if e == i: oline += '</span>' i += 1 if c == '<': oline += '<' elif c == '>': oline += '>' else: oline += c for b, e, name in ranges: if b >= i: oline += '<span class="%s">' % name if e >= i: oline += '</span>' if not line or line[-1] != '\n': oline += '\n' self.htmlfile.write(oline) class Scanner_PreUH3(Scanner): """Scanner for Universal Headers before release 3""" def initpatterns(self): Scanner.initpatterns(self) self.head_pat = "^extern pascal[ \t]+" # XXX Mac specific! self.type_pat = "pascal[ \t\n]+(?P<type>[a-zA-Z0-9_ \t]*[a-zA-Z0-9_])[ \t\n]+" self.whole_pat = self.type_pat + self.name_pat + self.args_pat self.sym_pat = "^[ \t]*(?P<name>[a-zA-Z0-9_]+)[ \t]*=" + \ "[ \t]*(?P<defn>[-0-9'\"][^\t\n,;}]*),?" class Scanner_OSX(Scanner): """Scanner for modern (post UH3.3) Universal Headers """ def initpatterns(self): Scanner.initpatterns(self) self.head_pat = "^EXTERN_API(_C)?" self.type_pat = "EXTERN_API(_C)?" + \ "[ \t\n]*\([ \t\n]*" + \ "(?P<type>[a-zA-Z0-9_* \t]*[a-zA-Z0-9_*])" + \ "[ \t\n]*\)[ \t\n]*" self.whole_pat = self.type_pat + self.name_pat + self.args_pat self.sym_pat = "^[ \t]*(?P<name>[a-zA-Z0-9_]+)[ \t]*=" + \ "[ \t]*(?P<defn>[-0-9_a-zA-Z'\"\(][^\t\n,;}]*),?" _8bit = re.compile(r"[\200-\377]") def escape8bit(s): if _8bit.search(s) is not None: out = [] for c in s: o = ord(c) if o >= 128: out.append("\\" + hex(o)[1:]) else: out.append(c) s = "".join(out) return s def test(): input = "D:Development:THINK C:Mac #includes:Apple #includes:AppleEvents.h" output = "@aespecs.py" defsoutput = "@aedefs.py" s = Scanner(input, output, defsoutput) s.scan() if __name__ == '__main__': test()