Current File : //usr/lib/python3/dist-packages/reportlab/lib/rparsexml.py
"""Very simple and fast XML parser, used for intra-paragraph text.
Devised by Aaron Watters in the bad old days before Python had fast
parsers available. Constructs the lightest possible in-memory
representation; parses most files we have seen in pure python very
quickly.
The output structure is the same as the one produced by pyRXP,
our validating C-based parser, which was written later. It will
use pyRXP if available.
This is used to parse intra-paragraph markup.
Example parse::
<this type="xml">text <b>in</b> xml</this>
( "this",
{"type": "xml"},
[ "text ",
("b", None, ["in"], None),
" xml"
]
None )
{ 0: "this"
"type": "xml"
1: ["text ",
{0: "b", 1:["in"]},
" xml"]
}
Ie, xml tag translates to a tuple:
(name, dictofattributes, contentlist, miscellaneousinfo)
where miscellaneousinfo can be anything, (but defaults to None)
(with the intention of adding, eg, line number information)
special cases: name of "" means "top level, no containing tag".
Top level parse always looks like this::
("", list, None, None)
contained text of None means <simple_tag/>
In order to support stuff like::
<this></this><one></one>
AT THE MOMENT & ETCETERA ARE IGNORED. THEY MUST BE PROCESSED
IN A POST-PROCESSING STEP.
PROLOGUES ARE NOT UNDERSTOOD. OTHER STUFF IS PROBABLY MISSING.
"""
RequirePyRXP = 0 # set this to 1 to disable the nonvalidating fallback parser.
try:
#raise ImportError, "dummy error"
simpleparse = 0
import pyRXPU
def warnCB(s):
print(s)
pyRXP_parser = pyRXPU.Parser(
ErrorOnValidityErrors=1,
NoNoDTDWarning=1,
ExpandCharacterEntities=1,
ExpandGeneralEntities=1,
warnCB = warnCB,
srcName='string input',
ReturnUTF8 = 0,
)
def parsexml(xmlText, oneOutermostTag=0,eoCB=None,entityReplacer=None,parseOpts={}):
pyRXP_parser.eoCB = eoCB
p = pyRXP_parser.parse(xmlText,**parseOpts)
return oneOutermostTag and p or ('',None,[p],None)
except ImportError:
simpleparse = 1
class smartDecode:
@staticmethod
def __call__(s):
#print('initial')
import chardet
def __call__(s):
if isinstance(s,str): return s
cdd = chardet.detect(s)
#print('final')
return s.decode(cdd["encoding"])
smartDecode.__class__.__call__ = staticmethod(__call__)
return __call__(s)
smartDecode = smartDecode()
NONAME = ""
NAMEKEY = 0
CONTENTSKEY = 1
CDATAMARKER = "<![CDATA["
LENCDATAMARKER = len(CDATAMARKER)
CDATAENDMARKER = "]]>"
replacelist = [("<", "<"), (">", ">"), ("&", "&")] # amp must be last
#replacelist = []
def unEscapeContentList(contentList):
result = []
for e in contentList:
if "&" in e:
for (old, new) in replacelist:
e = e.replace(old, new)
result.append(e)
return result
def parsexmlSimple(xmltext, oneOutermostTag=0,eoCB=None,entityReplacer=unEscapeContentList):
"""official interface: discard unused cursor info"""
if RequirePyRXP:
raise ImportError("pyRXP not found, fallback parser disabled")
(result, cursor) = parsexml0(xmltext,entityReplacer=entityReplacer)
if oneOutermostTag:
return result[2][0]
else:
return result
if simpleparse:
parsexml = parsexmlSimple
def parseFile(filename):
raw = open(filename, 'r').read()
return parsexml(raw)
verbose = 0
def skip_prologue(text, cursor):
"""skip any prologue found after cursor, return index of rest of text"""
### NOT AT ALL COMPLETE!!! definitely can be confused!!!
prologue_elements = ("!DOCTYPE", "?xml", "!--")
done = None
while done is None:
#print "trying to skip:", repr(text[cursor:cursor+20])
openbracket = text.find("<", cursor)
if openbracket<0: break
past = openbracket+1
found = None
for e in prologue_elements:
le = len(e)
if text[past:past+le]==e:
found = 1
cursor = text.find(">", past)
if cursor<0:
raise ValueError("can't close prologue %r" % e)
cursor = cursor+1
if found is None:
done=1
#print "done skipping"
return cursor
def parsexml0(xmltext, startingat=0, toplevel=1,
# snarf in some globals
entityReplacer=unEscapeContentList,
#len=len, None=None
#LENCDATAMARKER=LENCDATAMARKER, CDATAMARKER=CDATAMARKER
):
"""simple recursive descent xml parser...
return (dictionary, endcharacter)
special case: comment returns (None, endcharacter)"""
xmltext = smartDecode(xmltext)
#print "parsexml0", repr(xmltext[startingat: startingat+10])
# DEFAULTS
NameString = NONAME
ContentList = AttDict = ExtraStuff = None
if toplevel is not None:
#if verbose: print "at top level"
#if startingat!=0:
# raise ValueError, "have to start at 0 for top level!"
xmltext = xmltext.strip()
cursor = startingat
#look for interesting starting points
firstbracket = xmltext.find("<", cursor)
afterbracket2char = xmltext[firstbracket+1:firstbracket+3]
#print "a", repr(afterbracket2char)
#firstampersand = xmltext.find("&", cursor)
#if firstampersand>0 and firstampersand<firstbracket:
# raise ValueError, "I don't handle ampersands yet!!!"
docontents = 1
if firstbracket<0:
# no tags
#if verbose: print "no tags"
if toplevel is not None:
#D = {NAMEKEY: NONAME, CONTENTSKEY: [xmltext[cursor:]]}
ContentList = [xmltext[cursor:]]
if entityReplacer: ContentList = entityReplacer(ContentList)
return (NameString, AttDict, ContentList, ExtraStuff), len(xmltext)
else:
raise ValueError("no tags at non-toplevel %s" % repr(xmltext[cursor:cursor+20]))
#D = {}
L = []
# look for start tag
# NEED to force always outer level is unnamed!!!
#if toplevel and firstbracket>0:
#afterbracket2char = xmltext[firstbracket:firstbracket+2]
if toplevel is not None:
#print "toplevel with no outer tag"
NameString = name = NONAME
cursor = skip_prologue(xmltext, cursor)
#break
elif firstbracket<0:
raise ValueError("non top level entry should be at start tag: %s" % repr(xmltext[:10]))
# special case: CDATA
elif afterbracket2char=="![" and xmltext[firstbracket:firstbracket+9]=="<![CDATA[":
#print "in CDATA", cursor
# skip straight to the close marker
startcdata = firstbracket+9
endcdata = xmltext.find(CDATAENDMARKER, startcdata)
if endcdata<0:
raise ValueError("unclosed CDATA %s" % repr(xmltext[cursor:cursor+20]))
NameString = CDATAMARKER
ContentList = [xmltext[startcdata: endcdata]]
cursor = endcdata+len(CDATAENDMARKER)
docontents = None
# special case COMMENT
elif afterbracket2char=="!-" and xmltext[firstbracket:firstbracket+4]=="<!--":
#print "in COMMENT"
endcommentdashes = xmltext.find("--", firstbracket+4)
if endcommentdashes<firstbracket:
raise ValueError("unterminated comment %s" % repr(xmltext[cursor:cursor+20]))
endcomment = endcommentdashes+2
if xmltext[endcomment]!=">":
raise ValueError("invalid comment: contains double dashes %s" % repr(xmltext[cursor:cursor+20]))
return (None, endcomment+1) # shortcut exit
else:
# get the rest of the tag
#if verbose: print "parsing start tag"
# make sure the tag isn't in doublequote pairs
closebracket = xmltext.find(">", firstbracket)
noclose = closebracket<0
startsearch = closebracket+1
pastfirstbracket = firstbracket+1
tagcontent = xmltext[pastfirstbracket:closebracket]
# shortcut, no equal means nothing but name in the tag content
if '=' not in tagcontent:
if tagcontent[-1]=="/":
# simple case
#print "simple case", tagcontent
tagcontent = tagcontent[:-1]
docontents = None
name = tagcontent.strip()
NameString = name
cursor = startsearch
else:
if '"' in tagcontent:
# check double quotes
stop = None
# not inside double quotes! (the split should have odd length)
if noclose or len((tagcontent+".").split('"'))% 2:
stop=1
while stop is None:
closebracket = xmltext.find(">", startsearch)
startsearch = closebracket+1
noclose = closebracket<0
tagcontent = xmltext[pastfirstbracket:closebracket]
# not inside double quotes! (the split should have odd length)
if noclose or len((tagcontent+".").split('"'))% 2:
stop=1
if noclose:
raise ValueError("unclosed start tag %s" % repr(xmltext[firstbracket:firstbracket+20]))
cursor = startsearch
#cursor = closebracket+1
# handle simple tag /> syntax
if xmltext[closebracket-1]=="/":
#if verbose: print "it's a simple tag"
closebracket = closebracket-1
tagcontent = tagcontent[:-1]
docontents = None
#tagcontent = xmltext[firstbracket+1:closebracket]
tagcontent = tagcontent.strip()
taglist = tagcontent.split("=")
#if not taglist:
# raise ValueError, "tag with no name %s" % repr(xmltext[firstbracket:firstbracket+20])
taglist0 = taglist[0]
taglist0list = taglist0.split()
#if len(taglist0list)>2:
# raise ValueError, "bad tag head %s" % repr(taglist0)
name = taglist0list[0]
#print "tag name is", name
NameString = name
# now parse the attributes
attributename = taglist0list[-1]
# put a fake att name at end of last taglist entry for consistent parsing
taglist[-1] = taglist[-1]+" f"
AttDict = D = {}
taglistindex = 1
lasttaglistindex = len(taglist)
#for attentry in taglist[1:]:
while taglistindex<lasttaglistindex:
#print "looking for attribute named", attributename
attentry = taglist[taglistindex]
taglistindex = taglistindex+1
attentry = attentry.strip()
if attentry[0]!='"':
raise ValueError("attribute value must start with double quotes" + repr(attentry))
while '"' not in attentry[1:]:
# must have an = inside the attribute value...
if taglistindex>lasttaglistindex:
raise ValueError("unclosed value " + repr(attentry))
nextattentry = taglist[taglistindex]
taglistindex = taglistindex+1
attentry = "%s=%s" % (attentry, nextattentry)
attentry = attentry.strip() # only needed for while loop...
attlist = attentry.split()
nextattname = attlist[-1]
attvalue = attentry[:-len(nextattname)]
attvalue = attvalue.strip()
try:
first = attvalue[0]; last=attvalue[-1]
except:
raise ValueError("attvalue,attentry,attlist="+repr((attvalue, attentry,attlist)))
if first==last=='"' or first==last=="'":
attvalue = attvalue[1:-1]
#print attributename, "=", attvalue
D[attributename] = attvalue
attributename = nextattname
# pass over other tags and content looking for end tag
if docontents is not None:
#print "now looking for end tag"
ContentList = L
while docontents is not None:
nextopenbracket = xmltext.find("<", cursor)
if nextopenbracket<cursor:
#if verbose: print "no next open bracket found"
if name==NONAME:
#print "no more tags for noname", repr(xmltext[cursor:cursor+10])
docontents=None # done
remainder = xmltext[cursor:]
cursor = len(xmltext)
if remainder:
L.append(remainder)
else:
raise ValueError("no close bracket for %s found after %s" % (name,repr(xmltext[cursor: cursor+20])))
# is it a close bracket?
elif xmltext[nextopenbracket+1]=="/":
#print "found close bracket", repr(xmltext[nextopenbracket:nextopenbracket+20])
nextclosebracket = xmltext.find(">", nextopenbracket)
if nextclosebracket<nextopenbracket:
raise ValueError("unclosed close tag %s" % repr(xmltext[nextopenbracket: nextopenbracket+20]))
closetagcontents = xmltext[nextopenbracket+2: nextclosebracket]
closetaglist = closetagcontents.split()
#if len(closetaglist)!=1:
#print closetagcontents
#raise ValueError, "bad close tag format %s" % repr(xmltext[nextopenbracket: nextopenbracket+20])
# name should match
closename = closetaglist[0]
#if verbose: print "closetag name is", closename
if name!=closename:
prefix = xmltext[:cursor]
endlinenum = len(prefix.split("\n"))
prefix = xmltext[:startingat]
linenum = len(prefix.split("\n"))
raise ValueError("at lines %s...%s close tag name doesn't match %s...%s %s" %(
linenum, endlinenum, repr(name), repr(closename), repr(xmltext[cursor: cursor+100])))
remainder = xmltext[cursor:nextopenbracket]
if remainder:
#if verbose: print "remainder", repr(remainder)
L.append(remainder)
cursor = nextclosebracket+1
#print "for", name, "found close tag"
docontents = None # done
# otherwise we are looking at a new tag, recursively parse it...
# first record any intervening content
else:
remainder = xmltext[cursor:nextopenbracket]
if remainder:
L.append(remainder)
#if verbose:
# #print "skipping", repr(remainder)
# #print "--- recursively parsing starting at", xmltext[nextopenbracket:nextopenbracket+20]
(parsetree, cursor) = parsexml0(xmltext, startingat=nextopenbracket, toplevel=None, entityReplacer=entityReplacer)
if parsetree:
L.append(parsetree)
# maybe should check for trailing garbage?
# toplevel:
# remainder = xmltext[cursor:].strip()
# if remainder:
# raise ValueError, "trailing garbage at top level %s" % repr(remainder[:20])
if ContentList:
if entityReplacer: ContentList = entityReplacer(ContentList)
t = (NameString, AttDict, ContentList, ExtraStuff)
return (t, cursor)
def pprettyprint(parsedxml):
"""pretty printer mainly for testing"""
if isinstance(parsedxml,(str,bytes)):
return parsedxml
(name, attdict, textlist, extra) = parsedxml
if not attdict: attdict={}
attlist = []
for k in attdict.keys():
v = attdict[k]
attlist.append("%s=%s" % (k, repr(v)))
attributes = " ".join(attlist)
if not name and attributes:
raise ValueError("name missing with attributes???")
if textlist is not None:
# with content
textlistpprint = list(map(pprettyprint, textlist))
textpprint = "\n".join(textlistpprint)
if not name:
return textpprint # no outer tag
# indent it
nllist = textpprint.split("\n")
textpprint = " "+ ("\n ".join(nllist))
return "<%s %s>\n%s\n</%s>" % (name, attributes, textpprint, name)
# otherwise must be a simple tag
return "<%s %s/>" % (name, attributes)
def testparse(s,dump=0):
from time import time
from pprint import pprint
now = time()
D = parsexmlSimple(s,oneOutermostTag=1)
print("DONE", time()-now)
if dump&4:
pprint(D)
#pprint(D)
if dump&1:
print("============== reformatting")
p = pprettyprint(D)
print(p)
def test(dump=0):
testparse("""<this type="xml">text <><b>in</b> <funnytag foo="bar"/> xml</this>
<!-- comment -->
<![CDATA[
<this type="xml">text <b>in</b> xml</this> ]]>
<tag with="<brackets in values>">just testing brackets feature</tag>
""",dump=dump)
if __name__=="__main__":
test(dump=1)
import sys, os
from time import time
import reportlab
now = time()
seen = 0
for f in sys.argv[1:]:
if not os.path.isfile(f):
print("!!!!! no file at {f!r}")
else:
with open(f) as _f:
t = _f.read()
print(f"parsing {f!r} |t|={len(t)}")
testparse(t,dump=1)
seen += 1
if seen:
print(f"timed at {time()-now:.2f} secs.")
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