/*
* Process command. When we get here, we've processed "<!-"
*/
xml_token_type_t
xml_skip_comment(xml_reader_t *xr)
{
int match = 0, cc;
if (xml_getc(xr) != '-') {
xml_parse_error(xr, "Unexpected <!-...> element");
return None;
}
while ((cc = xml_getc(xr)) != EOF) {
if (cc == '-') {
match++;
} else {
if (cc == '>' && match >= 2) {
#ifdef XMLDEBUG_PARSER
xml_debug("Processed comment\n");
#endif
return Comment;
}
match = 0;
}
}
xml_parse_error(xr, "Unexpected end of file while parsing comment");
return None;
}
/*
* Expand an XML entity.
* For now, we support &<number>; as well as symbolic entities
* lt gt amp
*/
bool
xml_expand_entity(xml_reader_t *xr, string_t *res)
{
char entity[128];
unsigned int elen = 0;
int cc, expanded;
while ((cc = xml_getc(xr)) != ';') {
if (cc == EOF) {
xml_parse_error(xr, "Unexpenced EOF in entity");
return false;
}
if (isspace(cc))
continue;
if (elen + 1 >= sizeof(entity)) {
xml_parse_error(xr, "Entity string too long");
return false;
}
entity[elen++] = cc;
}
entity[elen] = '\0';
if (elen == 0) {
xml_parse_error(xr, "Empty entity &;");
return false;
}
if (!strcasecmp(entity, "lt"))
expanded = '<';
else if (!strcasecmp(entity, "gt"))
expanded = '>';
else if (!strcasecmp(entity, "amp"))
expanded = '&';
else {
const char *es = entity;
if (*es == '#') {
expanded = strtoul(es + 1, (char **) &es, 0);
if (*es == '\0')
goto good;
}
xml_parse_error(xr, "Cannot expand unknown entity &%s;", entity);
return false;
}
good:
string_putc(res, expanded);
return true;
}
/*
* Expand an XML entity.
* For now, we support &<number>; as well as symbolic entities
* lt gt amp
*/
ni_bool_t
xml_expand_entity(xml_reader_t *xr, ni_stringbuf_t *res)
{
char temp[128];
ni_stringbuf_t entity = NI_STRINGBUF_INIT_BUFFER(temp);
int cc, expanded;
while ((cc = xml_getc(xr)) != ';') {
if (cc == EOF) {
xml_parse_error(xr, "Unexpenced EOF in entity");
return FALSE;
}
if (isspace(cc))
continue;
if (entity.len + sizeof(char) >= entity.size) {
xml_parse_error(xr, "Entity is too long");
return FALSE;
}
ni_stringbuf_putc(&entity, cc);
}
if (ni_string_empty(entity.string)) {
xml_parse_error(xr, "Empty entity &;");
return FALSE;
}
if (!strcasecmp(entity.string, "lt"))
expanded = '<';
else if (!strcasecmp(entity.string, "gt"))
expanded = '>';
else if (!strcasecmp(entity.string, "amp"))
expanded = '&';
else {
const char *es = entity.string;
if (*es == '#') {
expanded = strtoul(es + 1, (char **) &es, 0);
if (*es == '\0')
goto good;
}
xml_parse_error(xr, "Cannot expand unknown entity &%s;", entity.string);
return FALSE;
}
good:
ni_stringbuf_putc(res, expanded);
return TRUE;
}
/*
* Get the next token from the XML stream
*/
xml_token_type_t
xml_get_token(xml_reader_t *xr, ni_stringbuf_t *res)
{
#ifdef XMLDEBUG_PARSER
xml_parser_state_t old_state = xr->state;
#endif
xml_token_type_t token;
ni_stringbuf_clear(res);
switch (xr->state) {
default:
xml_parse_error(xr, "Unexpected state %u in XML reader", xr->state);
return None;
case Error:
return None;
case Initial:
token = xml_get_token_initial(xr, res);
break;
case Tag:
token = xml_get_token_tag(xr, res);
break;
}
xml_debug("++ %3u %-7s %-10s (%s)\n",
xr->lineCount,
xml_parser_state_name(old_state),
xml_token_name(token),
res->string?: "");
return token;
}
xml_token_type_t
xml_get_tag_attributes(xml_reader_t *xr, xml_node_t *node)
{
ni_stringbuf_t tokenValue, attrName, attrValue;
xml_token_type_t token;
ni_stringbuf_init(&tokenValue);
ni_stringbuf_init(&attrName);
ni_stringbuf_init(&attrValue);
token = xml_get_token(xr, &tokenValue);
while (1) {
if (token == RightAngle || token == RightAngleQ || token == RightAngleSlash)
break;
if (token != Identifier) {
xml_parse_error(xr, "Unexpected token in tag attributes");
token = None;
break;
}
ni_stringbuf_move(&attrName, &tokenValue);
token = xml_get_token(xr, &tokenValue);
if (token != Equals) {
xml_node_add_attr(node, attrName.string, NULL);
continue;
}
token = xml_get_token(xr, &tokenValue);
if (token != QuotedString) {
xml_parse_error(xr, "Attribute value not a quoted string!");
token = None;
break;
}
xml_debug(" attr %s=%s\n", attrName.string, tokenValue.string);
xml_node_add_attr(node, attrName.string, tokenValue.string);
token = xml_get_token(xr, &tokenValue);
}
ni_stringbuf_destroy(&tokenValue);
ni_stringbuf_destroy(&attrName);
ni_stringbuf_destroy(&attrValue);
return token;
}
/*
* Process CDATA. When we get here, we've processed "<[CDATA"
*/
xml_token_type_t
xml_process_cdata(xml_reader_t *xr, string_t *res)
{
int cc, state = 0;
cc = xml_getc(xr);
if (cc == EOF)
goto unexpected_eof;
if (cc != '[') {
xml_parse_error(xr, "Unexpected '%c' after <[CDATA in XML stream", cc);
return None;
}
while (state != 3) {
cc = xml_getc(xr);
if (cc == EOF)
goto unexpected_eof;
if (cc == ']') {
if (state == 2) {
string_putc(res, ']');
} else {
++state;
}
} else
if (cc == '>' && state == 2) {
++state;
} else {
while (state) {
string_putc(res, ']');
state--;
}
string_putc(res, cc);
}
}
xr->state = Initial;
return CData;
unexpected_eof:
xml_parse_error(xr, "Unexpected EOF after <[CDATA in XML stream");
return None;
}
xml_token_type_t
xml_get_token_tag(xml_reader_t *xr, ni_stringbuf_t *res)
{
int cc, oc;
xml_skip_space(xr, NULL);
cc = xml_getc(xr);
if (cc == EOF) {
xml_parse_error(xr, "Unexpected EOF while parsing tag");
return None;
}
ni_stringbuf_putc(res, cc);
switch (cc) {
case '<':
goto error;
case '?':
if ((cc = xml_getc(xr)) != '>')
goto error;
ni_stringbuf_putc(res, cc);
xr->state = Initial;
return RightAngleQ;
case '>':
xr->state = Initial;
return RightAngle;
case '/':
if ((cc = xml_getc(xr)) != '>')
goto error;
ni_stringbuf_putc(res, cc);
xr->state = Initial;
return RightAngleSlash;
case '=':
return Equals;
case 'a' ... 'z':
case 'A' ... 'Z':
case '_':
case '!':
while ((cc = xml_getc(xr)) != EOF) {
if (!isalnum(cc) && cc != '_' && cc != '!' && cc != ':' && cc != '-') {
xml_ungetc(xr, cc);
break;
}
ni_stringbuf_putc(res, cc);
}
return Identifier;
case '\'':
case '"':
ni_stringbuf_clear(res);
oc = cc;
while (1) {
cc = xml_getc(xr);
if (cc == EOF) {
xml_parse_error(xr, "Unexpected EOF while parsing quoted string");
return None;
}
if (cc == oc)
break;
ni_stringbuf_putc(res, cc);
}
return QuotedString;
default:
break;
}
error:
xml_parse_error(xr, "Unexpected character %c in XML document", cc);
return None;
}
/*
* While in state Initial, obtain the next token
*/
xml_token_type_t
xml_get_token_initial(xml_reader_t *xr, ni_stringbuf_t *res)
{
xml_token_type_t token;
int cc;
restart:
/* Eat initial white space and store it in @res */
xml_skip_space(xr, res);
cc = xml_getc(xr);
if (cc == EOF) {
ni_stringbuf_clear(res);
return EndOfDocument;
}
if (cc == '<') {
/* Discard the white space in @res - we're not interested in that. */
ni_stringbuf_clear(res);
ni_stringbuf_putc(res, cc);
if (xr->state != Initial) {
xml_parse_error(xr, "Unexpected < in XML stream (state %s)",
xml_parser_state_name(xr->state));
return None;
}
/* tag is legal here */
xr->state = Tag;
cc = xml_getc(xr);
switch (cc) {
case '/':
ni_stringbuf_putc(res, cc);
return LeftAngleSlash;
case '?':
ni_stringbuf_putc(res, cc);
return LeftAngleQ;
case '!':
ni_stringbuf_putc(res, cc);
/* If it's <!IDENTIFIER, return LeftAngleExclam */
cc = xml_getc(xr);
if (cc != '-') {
xml_ungetc(xr, cc);
return LeftAngleExclam;
}
token = xml_skip_comment(xr);
if (token == Comment) {
xr->state = Initial;
ni_stringbuf_clear(res);
goto restart;
}
return token;
default:
xml_ungetc(xr, cc);
break;
}
return LeftAngle;
}
// Looks like CDATA.
// Ignore initial newline, then scan to next <
do {
if (cc == '<') {
/* Looks like we're done.
* FIXME: handle comments within CDATA?
*/
xml_ungetc(xr, cc);
break;
} else
if (cc == '&') {
if (!xml_expand_entity(xr, res))
return None;
} else {
ni_stringbuf_putc(res, cc);
}
cc = xml_getc(xr);
} while (cc != EOF);
ni_stringbuf_trim_empty_lines(res);
return CData;
}
ni_bool_t
xml_process_element_nested(xml_reader_t *xr, xml_node_t *cur, unsigned int nesting)
{
ni_stringbuf_t tokenValue, identifier;
xml_token_type_t token;
xml_node_t *child;
ni_stringbuf_init(&tokenValue);
ni_stringbuf_init(&identifier);
while (1) {
token = xml_get_token(xr, &tokenValue);
switch (token) {
case CData:
/* process element content */
xml_node_set_cdata(cur, tokenValue.string);
break;
case LeftAngleExclam:
/* Most likely <!DOCTYPE ...> */
if (!xml_get_identifier(xr, &identifier)) {
xml_parse_error(xr, "Bad element: tag open <! not followed by identifier");
goto error;
}
if (strcmp(identifier.string, "DOCTYPE")) {
xml_parse_error(xr, "Unexpected element: <!%s ...> not supported", identifier.string);
goto error;
}
while (1) {
token = xml_get_token(xr, &identifier);
if (token == RightAngle)
break;
if (token == Identifier && !xr->doctype)
ni_string_dup(&xr->doctype, identifier.string);
if (token != Identifier && token != QuotedString) {
xml_parse_error(xr, "Error parsing <!DOCTYPE ...> attributes");
goto error;
}
}
break;
case LeftAngle:
/* New element start */
if (!xml_get_identifier(xr, &identifier)) {
xml_parse_error(xr, "Bad element: tag open < not followed by identifier");
goto error;
}
child = xml_node_new(identifier.string, cur);
if (xr->shared_location)
child->location = xml_location_new(xr->shared_location, xr->lineCount);
token = xml_get_tag_attributes(xr, child);
if (token == None) {
xml_parse_error(xr, "Error parsing <%s ...> tag attributes", child->name);
goto error;
} else
if (token == RightAngle) {
/* Handle <foo>...</foo> */
xml_debug("%*.*s<%s>\n", nesting, nesting, "", child->name);
if (!xml_process_element_nested(xr, child, nesting + 2))
goto error;
} else if (token == RightAngleSlash) {
/* We parsed a "<foo/>" element - nothing left to do, we're done */
xml_debug("%*.*s<%s/>\n", nesting, nesting, "", child->name);
} else {
xml_parse_error(xr, "Unexpected token %s at end of <%s ...",
xml_token_name(token), child->name);
goto error;
}
break;
case LeftAngleSlash:
/* Element end */
if (!xml_get_identifier(xr, &identifier)) {
xml_parse_error(xr, "Bad element: end tag open </ not followed by identifier");
goto error;
}
if (xml_get_token(xr, &tokenValue) != RightAngle) {
xml_parse_error(xr, "Bad element: </%s - missing tag close", identifier.string);
goto error;
}
if (cur->parent == NULL) {
xml_parse_error(xr, "Unexpected </%s> tag", identifier.string);
goto error;
}
if (strcmp(cur->name, identifier.string)) {
xml_parse_error(xr, "Closing tag </%s> does not match <%s>",
identifier.string, cur->name);
goto error;
}
xml_debug("%*.*s</%s>\n", nesting, nesting, "", cur->name);
goto success;
case LeftAngleQ:
/* New PI node starts here */
if (!xml_get_identifier(xr, &identifier)) {
xml_parse_error(xr, "Bad element: tag open <? not followed by identifier");
goto error;
}
child = xml_node_new(identifier.string, NULL);
if (xr->shared_location)
child->location = xml_location_new(xr->shared_location, xr->lineCount);
token = xml_get_tag_attributes(xr, child);
if (token == None) {
xml_parse_error(xr, "Error parsing <?%s ...?> tag attributes", child->name);
xml_node_free(child);
goto error;
} else
if (token == RightAngleQ) {
xml_debug("%*.*s<%s>\n", nesting, nesting, "", child->name);
xml_process_pi_node(xr, child);
xml_node_free(child);
} else {
xml_parse_error(xr, "Unexpected token %s at end of <?%s ...",
xml_token_name(token), child->name);
xml_node_free(child);
goto error;
}
break;
case EndOfDocument:
if (cur->parent) {
xml_parse_error(xr, "End of document while processing element <%s>", cur->name);
goto error;
}
goto success;
case None:
/* parser error */
goto error;
default:
xml_parse_error(xr, "Unexpected token %s", xml_token_name(token));
goto error;
}
}
success:
ni_stringbuf_destroy(&tokenValue);
ni_stringbuf_destroy(&identifier);
return TRUE;
error:
ni_stringbuf_destroy(&tokenValue);
ni_stringbuf_destroy(&identifier);
return FALSE;
}
