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Change RuntimeError to SGMLParseError, which subclasses RuntimeError 

for backward compatibility.

Add support for SGML declaration syntax (<!....>) to some reasonable
degree.  This does not support everything allowed in SGML, but should
work with "real" HTML (internal subset in a DOCTYPE is not handled).
The content of the declaration is passed to the .handle_decl() method,
which can be overridden by subclasses.
This commit is contained in:
Fred Drake 2001-03-16 20:04:57 +00:00
parent 83e01bf6c8
commit 669573726b
1 changed files with 53 additions and 5 deletions
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58
Lib/sgmllib.py
View File

@ -39,6 +39,14 @@ attrfind = re.compile(
r'\s*([a-zA-Z_][-.a-zA-Z_0-9]*)(\s*=\s*' r'\s*([a-zA-Z_][-.a-zA-Z_0-9]*)(\s*=\s*'
r'(\'[^\']*\'|"[^"]*"|[-a-zA-Z0-9./:;+*%?!&$\(\)_#=~]*))?') r'(\'[^\']*\'|"[^"]*"|[-a-zA-Z0-9./:;+*%?!&$\(\)_#=~]*))?')
declname = re.compile(r'[a-zA-Z][-_.a-zA-Z0-9]*\s*')
declstringlit = re.compile(r'(\'[^\']*\'|"[^"]*")\s*')
class SGMLParseError(RuntimeError):
"""Exception raised for all parse errors."""
pass
# SGML parser base class -- find tags and call handler functions. # SGML parser base class -- find tags and call handler functions.
# Usage: p = SGMLParser(); p.feed(data); ...; p.close(). # Usage: p = SGMLParser(); p.feed(data); ...; p.close().
@ -144,7 +152,12 @@ class SGMLParser:
self.handle_data(rawdata[i]) self.handle_data(rawdata[i])
i = i+1 i = i+1
continue continue
i = match.end(0) # This is some sort of declaration; in "HTML as
# deployed," this should only be the document type
# declaration ("<!DOCTYPE html...>").
k = self.parse_declaration(i)
if k < 0: break
i = k
continue continue
elif rawdata[i] == '&': elif rawdata[i] == '&':
match = charref.match(rawdata, i) match = charref.match(rawdata, i)
@ -162,7 +175,7 @@ class SGMLParser:
if rawdata[i-1] != ';': i = i-1 if rawdata[i-1] != ';': i = i-1
continue continue
else: else:
raise RuntimeError, 'neither < nor & ??' raise SGMLParserError('neither < nor & ??')
# We get here only if incomplete matches but # We get here only if incomplete matches but
# nothing else # nothing else
match = incomplete.match(rawdata, i) match = incomplete.match(rawdata, i)
@ -186,7 +199,7 @@ class SGMLParser:
def parse_comment(self, i): def parse_comment(self, i):
rawdata = self.rawdata rawdata = self.rawdata
if rawdata[i:i+4] != '<!--': if rawdata[i:i+4] != '<!--':
raise RuntimeError, 'unexpected call to handle_comment' raise SGMLParseError('unexpected call to parse_comment()')
match = commentclose.search(rawdata, i+4) match = commentclose.search(rawdata, i+4)
if not match: if not match:
return -1 return -1
@ -195,11 +208,42 @@ class SGMLParser:
j = match.end(0) j = match.end(0)
return j-i return j-i
# Internal -- parse declaration.
def parse_declaration(self, i):
rawdata = self.rawdata
j = i + 2
# in practice, this should look like: ((name|stringlit) S*)+ '>'
while 1:
c = rawdata[j:j+1]
if c == ">":
# end of declaration syntax
self.handle_decl(rawdata[i+2:j])
return j + 1
if c in "\"'":
m = declstringlit.match(rawdata, j)
if not m:
# incomplete or an error?
return -1
j = m.end()
elif c in "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ":
m = declname.match(rawdata, j)
if not m:
# incomplete or an error?
return -1
j = m.end()
elif i == len(rawdata):
# end of buffer between tokens
return -1
else:
raise SGMLParseError(
"unexpected char in declaration: %s" % `rawdata[i]`)
assert 0, "can't get here!"
# Internal -- parse processing instr, return length or -1 if not terminated # Internal -- parse processing instr, return length or -1 if not terminated
def parse_pi(self, i): def parse_pi(self, i):
rawdata = self.rawdata rawdata = self.rawdata
if rawdata[i:i+2] != '<?': if rawdata[i:i+2] != '<?':
raise RuntimeError, 'unexpected call to handle_pi' raise SGMLParseError('unexpected call to parse_pi()')
match = piclose.search(rawdata, i+2) match = piclose.search(rawdata, i+2)
if not match: if not match:
return -1 return -1
@ -246,7 +290,7 @@ class SGMLParser:
else: else:
match = tagfind.match(rawdata, i+1) match = tagfind.match(rawdata, i+1)
if not match: if not match:
raise RuntimeError, 'unexpected call to parse_starttag' raise SGMLParseError('unexpected call to parse_starttag')
k = match.end(0) k = match.end(0)
tag = rawdata[i+1:k].lower() tag = rawdata[i+1:k].lower()
self.lasttag = tag self.lasttag = tag
@ -383,6 +427,10 @@ class SGMLParser:
def handle_comment(self, data): def handle_comment(self, data):
pass pass
# Example -- handle declaration, could be overridden
def handle_decl(self, decl):
pass
# Example -- handle processing instruction, could be overridden # Example -- handle processing instruction, could be overridden
def handle_pi(self, data): def handle_pi(self, data):
pass pass