Added character data buffering to pyexpat parser objects.
Setting the buffer_text attribute to true causes the parser to collect character data, waiting as long as possible to report it to the Python callback. This can save an enormous number of callbacks from C to Python, which can be a substantial performance improvement. buffer_text defaults to false.
This commit is contained in:
Fred Drake
parent
3e76d7f3b3
commit
2a3d7db93e
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@ -6,7 +6,7 @@
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import pyexpat
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from xml.parsers import expat
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from test_support import sortdict
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from test_support import sortdict, TestFailed
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class Outputter:
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def StartElementHandler(self, name, attrs):
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@ -218,3 +218,96 @@ for entry in L:
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print "(it didn't)"
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print "L =", `L`
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break
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# Tests of the buffer_text attribute.
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import sys
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class TextCollector:
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def __init__(self, parser):
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self.stuff = []
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def check(self, expected, label):
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require(self.stuff == expected,
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"%s\nstuff = %s\nexpected = %s"
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% (label, `self.stuff`, `map(unicode, expected)`))
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def CharacterDataHandler(self, text):
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self.stuff.append(text)
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def StartElementHandler(self, name, attrs):
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self.stuff.append("<%s>" % name)
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bt = attrs.get("buffer-text")
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if bt == "yes":
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parser.buffer_text = 1
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elif bt == "no":
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parser.buffer_text = 0
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def EndElementHandler(self, name):
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self.stuff.append("</%s>" % name)
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def CommentHandler(self, data):
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self.stuff.append("<!--%s-->" % data)
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def require(cond, label):
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# similar to confirm(), but no extraneous output
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if not cond:
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raise TestFailed(label)
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def setup(handlers=[]):
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parser = expat.ParserCreate()
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require(not parser.buffer_text,
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"buffer_text not disabled by default")
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parser.buffer_text = 1
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handler = TextCollector(parser)
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parser.CharacterDataHandler = handler.CharacterDataHandler
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for name in handlers:
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setattr(parser, name, getattr(handler, name))
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return parser, handler
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parser, handler = setup()
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require(parser.buffer_text,
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"text buffering either not acknowledged or not enabled")
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parser.Parse("<a>1<b/>2<c/>3</a>", 1)
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handler.check(["123"],
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"buffered text not properly collapsed")
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# XXX This test exposes more detail of Expat's text chunking than we
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# XXX like, but it tests what we need to concisely.
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parser, handler = setup(["StartElementHandler"])
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parser.Parse("<a>1<b buffer-text='no'/>2\n3<c buffer-text='yes'/>4\n5</a>", 1)
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handler.check(["<a>", "1", "<b>", "2", "\n", "3", "<c>", "4\n5"],
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"buffering control not reacting as expected")
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parser, handler = setup()
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parser.Parse("<a>1<b/><2><c/> \n 3</a>", 1)
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handler.check(["1<2> \n 3"],
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"buffered text not properly collapsed")
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parser, handler = setup(["StartElementHandler"])
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parser.Parse("<a>1<b/>2<c/>3</a>", 1)
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handler.check(["<a>", "1", "<b>", "2", "<c>", "3"],
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"buffered text not properly split")
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parser, handler = setup(["StartElementHandler", "EndElementHandler"])
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parser.CharacterDataHandler = None
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parser.Parse("<a>1<b/>2<c/>3</a>", 1)
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handler.check(["<a>", "<b>", "</b>", "<c>", "</c>", "</a>"],
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"huh?")
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parser, handler = setup(["StartElementHandler", "EndElementHandler"])
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parser.Parse("<a>1<b></b>2<c/>3</a>", 1)
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handler.check(["<a>", "1", "<b>", "</b>", "2", "<c>", "</c>", "3", "</a>"],
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"huh?")
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parser, handler = setup(["CommentHandler", "EndElementHandler",
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"StartElementHandler"])
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parser.Parse("<a>1<b/>2<c></c>345</a> ", 1)
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handler.check(["<a>", "1", "<b>", "</b>", "2", "<c>", "</c>", "345", "</a>"],
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"buffered text not properly split")
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parser, handler = setup(["CommentHandler", "EndElementHandler",
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"StartElementHandler"])
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parser.Parse("<a>1<b/>2<c></c>3<!--abc-->4<!--def-->5</a> ", 1)
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handler.check(["<a>", "1", "<b>", "</b>", "2", "<c>", "</c>", "3",
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"<!--abc-->", "4", "<!--def-->", "5", "</a>"],
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"buffered text not properly split")
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@ -60,10 +60,16 @@ typedef struct {
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int ordered_attributes; /* Return attributes as a list. */
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int specified_attributes; /* Report only specified attributes. */
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int in_callback; /* Is a callback active? */
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XML_Char *buffer; /* Buffer used when accumulating characters */
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/* NULL if not enabled */
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int buffer_size; /* Size of buffer, in XML_Char units */
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int buffer_used; /* Buffer units in use */
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PyObject *intern; /* Dictionary to intern strings */
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PyObject **handlers;
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} xmlparseobject;
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#define CHARACTER_DATA_BUFFER_SIZE 8192
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staticforward PyTypeObject Xmlparsetype;
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typedef void (*xmlhandlersetter)(XML_Parser *self, void *meth);
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@ -313,6 +319,85 @@ string_intern(xmlparseobject *self, const char* str)
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return value;
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}
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/* Return 0 on success, -1 on exception.
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* flag_error() will be called before return if needed.
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*/
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static int
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call_character_handler(xmlparseobject *self, const XML_Char *buffer, int len)
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{
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PyObject *args;
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PyObject *temp;
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args = PyTuple_New(1);
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if (args == NULL)
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return -1;
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#ifdef Py_USING_UNICODE
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temp = (self->returns_unicode
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? conv_string_len_to_unicode(buffer, len)
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: conv_string_len_to_utf8(buffer, len));
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#else
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temp = conv_string_len_to_utf8(buffer, len);
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#endif
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if (temp == NULL) {
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Py_DECREF(args);
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flag_error(self);
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return -1;
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}
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PyTuple_SET_ITEM(args, 0, temp);
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/* temp is now a borrowed reference; consider it unused. */
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self->in_callback = 1;
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temp = call_with_frame(getcode(CharacterData, "CharacterData", __LINE__),
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self->handlers[CharacterData], args);
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/* temp is an owned reference again, or NULL */
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self->in_callback = 0;
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Py_DECREF(args);
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if (temp == NULL) {
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flag_error(self);
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return -1;
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}
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Py_DECREF(temp);
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return 0;
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}
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static int
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flush_character_buffer(xmlparseobject *self)
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{
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int rc;
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if (self->buffer == NULL || self->buffer_used == 0)
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return 0;
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rc = call_character_handler(self, self->buffer, self->buffer_used);
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self->buffer_used = 0;
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return rc;
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}
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static void
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my_CharacterDataHandler(void *userData, const XML_Char *data, int len)
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{
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xmlparseobject *self = (xmlparseobject *) userData;
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if (self->buffer == NULL)
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call_character_handler(self, data, len);
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else {
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if ((self->buffer_used + len) > self->buffer_size) {
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if (flush_character_buffer(self) < 0)
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return;
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/* handler might have changed; drop the rest on the floor
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* if there isn't a handler anymore
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*/
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if (!have_handler(self, CharacterData))
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return;
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}
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if (len > self->buffer_size) {
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call_character_handler(self, data, len);
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self->buffer_used = 0;
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}
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else {
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memcpy(self->buffer + self->buffer_used,
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data, len * sizeof(XML_Char));
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self->buffer_used += len;
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}
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}
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}
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static void
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my_StartElementHandler(void *userData,
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const XML_Char *name, const XML_Char *atts[])
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@ -323,6 +408,8 @@ my_StartElementHandler(void *userData,
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PyObject *container, *rv, *args;
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int i, max;
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if (flush_character_buffer(self) < 0)
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return;
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/* Set max to the number of slots filled in atts[]; max/2 is
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* the number of attributes we need to process.
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*/
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@ -402,6 +489,8 @@ my_##NAME##Handler PARAMS {\
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INIT \
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\
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if (have_handler(self, NAME)) { \
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if (flush_character_buffer(self) < 0) \
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return RETURN; \
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args = Py_BuildValue PARAM_FORMAT ;\
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if (!args) { flag_error(self); return RETURN;} \
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self->in_callback = 1; \
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@ -438,18 +527,6 @@ VOID_HANDLER(ProcessingInstruction,
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const XML_Char *data),
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("(NO&)", string_intern(self, target), STRING_CONV_FUNC,data))
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#ifndef Py_USING_UNICODE
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VOID_HANDLER(CharacterData,
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(void *userData, const XML_Char *data, int len),
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("(N)", conv_string_len_to_utf8(data,len)))
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#else
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VOID_HANDLER(CharacterData,
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(void *userData, const XML_Char *data, int len),
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("(N)", (self->returns_unicode
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? conv_string_len_to_unicode(data,len)
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: conv_string_len_to_utf8(data,len))))
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#endif
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VOID_HANDLER(UnparsedEntityDecl,
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(void *userData,
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const XML_Char *entityName,
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@ -673,6 +750,9 @@ get_parse_result(xmlparseobject *self, int rv)
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if (rv == 0) {
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return set_error(self);
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}
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if (flush_character_buffer(self) < 0) {
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return NULL;
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}
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return PyInt_FromLong(rv);
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}
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@ -890,6 +970,17 @@ xmlparse_ExternalEntityParserCreate(xmlparseobject *self, PyObject *args)
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if (new_parser == NULL)
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return NULL;
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new_parser->buffer_size = self->buffer_size;
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new_parser->buffer_used = 0;
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if (self->buffer != NULL) {
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new_parser->buffer = malloc(new_parser->buffer_size);
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if (new_parser->buffer == NULL) {
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PyObject_GC_Del(new_parser);
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return PyErr_NoMemory();
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}
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}
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else
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new_parser->buffer = NULL;
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new_parser->returns_unicode = self->returns_unicode;
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new_parser->ordered_attributes = self->ordered_attributes;
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new_parser->specified_attributes = self->specified_attributes;
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@ -913,10 +1004,10 @@ xmlparse_ExternalEntityParserCreate(xmlparseobject *self, PyObject *args)
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XML_SetUserData(new_parser->itself, (void *)new_parser);
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/* allocate and clear handlers first */
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for(i = 0; handler_info[i].name != NULL; i++)
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for (i = 0; handler_info[i].name != NULL; i++)
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/* do nothing */;
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new_parser->handlers = malloc(sizeof(PyObject *)*i);
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new_parser->handlers = malloc(sizeof(PyObject *) * i);
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if (!new_parser->handlers) {
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Py_DECREF(new_parser);
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return PyErr_NoMemory();
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@ -1053,6 +1144,9 @@ newxmlparseobject(char *encoding, char *namespace_separator, PyObject *intern)
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self->returns_unicode = 1;
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#endif
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self->buffer = NULL;
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self->buffer_size = CHARACTER_DATA_BUFFER_SIZE;
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self->buffer_used = 0;
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self->ordered_attributes = 0;
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self->specified_attributes = 0;
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self->in_callback = 0;
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@ -1081,7 +1175,7 @@ newxmlparseobject(char *encoding, char *namespace_separator, PyObject *intern)
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XML_SetUnknownEncodingHandler(self->itself, (XML_UnknownEncodingHandler) PyUnknownEncodingHandler, NULL);
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#endif
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for(i = 0; handler_info[i].name != NULL; i++)
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for (i = 0; handler_info[i].name != NULL; i++)
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/* do nothing */;
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self->handlers = malloc(sizeof(PyObject *)*i);
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@ -1118,6 +1212,10 @@ xmlparse_dealloc(xmlparseobject *self)
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free(self->handlers);
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self->handlers = NULL;
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}
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if (self->buffer != NULL) {
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free(self->buffer);
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self->buffer = NULL;
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}
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Py_XDECREF(self->intern);
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#if PY_MAJOR_VERSION == 1 && PY_MINOR_VERSION < 6
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/* Code for versions before 1.6 */
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@ -1179,6 +1277,14 @@ xmlparse_getattr(xmlparseobject *self, char *name)
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return PyInt_FromLong((long)
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XML_GetErrorByteIndex(self->itself));
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}
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if (name[0] == 'b') {
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if (strcmp(name, "buffer_size") == 0)
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return PyInt_FromLong((long) self->buffer_size);
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if (strcmp(name, "buffer_text") == 0)
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return get_pybool(self->buffer != NULL);
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if (strcmp(name, "buffer_used") == 0)
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return PyInt_FromLong((long) self->buffer_used);
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}
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if (strcmp(name, "ordered_attributes") == 0)
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return get_pybool(self->ordered_attributes);
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if (strcmp(name, "returns_unicode") == 0)
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@ -1206,6 +1312,9 @@ xmlparse_getattr(xmlparseobject *self, char *name)
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PyList_Append(rc, PyString_FromString("ErrorLineNumber"));
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PyList_Append(rc, PyString_FromString("ErrorColumnNumber"));
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PyList_Append(rc, PyString_FromString("ErrorByteIndex"));
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PyList_Append(rc, PyString_FromString("buffer_size"));
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PyList_Append(rc, PyString_FromString("buffer_text"));
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PyList_Append(rc, PyString_FromString("buffer_used"));
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PyList_Append(rc, PyString_FromString("ordered_attributes"));
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PyList_Append(rc, PyString_FromString("returns_unicode"));
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PyList_Append(rc, PyString_FromString("specified_attributes"));
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@ -1246,6 +1355,25 @@ xmlparse_setattr(xmlparseobject *self, char *name, PyObject *v)
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PyErr_SetString(PyExc_RuntimeError, "Cannot delete attribute");
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return -1;
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}
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if (strcmp(name, "buffer_text") == 0) {
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if (PyObject_IsTrue(v)) {
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if (self->buffer == NULL) {
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self->buffer = malloc(self->buffer_size);
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if (self->buffer == NULL) {
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PyErr_NoMemory();
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return -1;
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}
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self->buffer_used = 0;
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}
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}
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else if (self->buffer != NULL) {
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if (flush_character_buffer(self) < 0)
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return -1;
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free(self->buffer);
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self->buffer = NULL;
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}
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return 0;
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}
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if (strcmp(name, "ordered_attributes") == 0) {
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if (PyObject_IsTrue(v))
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self->ordered_attributes = 1;
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@ -1274,6 +1402,15 @@ xmlparse_setattr(xmlparseobject *self, char *name, PyObject *v)
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self->specified_attributes = 0;
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return 0;
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}
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if (strcmp(name, "CharacterDataHandler") == 0) {
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/* If we're changing the character data handler, flush all
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* cached data with the old handler. Not sure there's a
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* "right" thing to do, though, but this probably won't
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* happen.
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*/
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if (flush_character_buffer(self) < 0)
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return -1;
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}
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if (sethandler(self, name, v)) {
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return 0;
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}
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@ -1658,16 +1795,16 @@ statichere struct HandlerInfo handler_info[] = {
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(xmlhandler)my_CharacterDataHandler},
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{"UnparsedEntityDeclHandler",
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(xmlhandlersetter)XML_SetUnparsedEntityDeclHandler,
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(xmlhandler)my_UnparsedEntityDeclHandler },
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(xmlhandler)my_UnparsedEntityDeclHandler},
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{"NotationDeclHandler",
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(xmlhandlersetter)XML_SetNotationDeclHandler,
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(xmlhandler)my_NotationDeclHandler },
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(xmlhandler)my_NotationDeclHandler},
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{"StartNamespaceDeclHandler",
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(xmlhandlersetter)XML_SetStartNamespaceDeclHandler,
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(xmlhandler)my_StartNamespaceDeclHandler },
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(xmlhandler)my_StartNamespaceDeclHandler},
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{"EndNamespaceDeclHandler",
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(xmlhandlersetter)XML_SetEndNamespaceDeclHandler,
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(xmlhandler)my_EndNamespaceDeclHandler },
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(xmlhandler)my_EndNamespaceDeclHandler},
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{"CommentHandler",
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(xmlhandlersetter)XML_SetCommentHandler,
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(xmlhandler)my_CommentHandler},
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@ -1688,7 +1825,7 @@ statichere struct HandlerInfo handler_info[] = {
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(xmlhandler)my_NotStandaloneHandler},
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{"ExternalEntityRefHandler",
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(xmlhandlersetter)XML_SetExternalEntityRefHandler,
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(xmlhandler)my_ExternalEntityRefHandler },
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(xmlhandler)my_ExternalEntityRefHandler},
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{"StartDoctypeDeclHandler",
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(xmlhandlersetter)XML_SetStartDoctypeDeclHandler,
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(xmlhandler)my_StartDoctypeDeclHandler},
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