File Coverage

TagReader.xs

Criterion	Covered	Total	%
statement	159	196	81.1
branch	143	394	36.2
condition			n/a
subroutine			n/a
pod			n/a
total	302	590	51.1

/* vim: set sw=8 ts=8 si noet: */

/* written by Guido Socher.
*
* This program is free software; you can redistribute it
* and/or modify it under the same terms as Perl itself.
*/

/* read the following man pages to learn how to use XS and access
* perl from C:
* perlxs              Perl XS application programming interface
* perlxstut           Perl XS tutorial
* perlguts            Perl internal functions, variables, data structures for
*                     C programmer
* perlcall            Perl calling conventions from C
*/

#ifdef __cplusplus
extern "C" {
#endif
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
#include
#include
#include
#ifdef __cplusplus
}
#endif


/* tags longer than TAGREADER_MAX_TAGLEN produce a warning about
* not terminated tags, must be much smaler than BUFFLEN */
#define TAGREADER_MAX_TAGLEN 400
/* BUFFLEN is the units in which we re-allocate mem, must be much bigger than
* TAGREADER_MAX_TAGLEN */
#define BUFFLEN 6000
#define TAGREADER_TAGTYPELEN 20

typedef struct trstuct{
	char *filename;
	int fileline;
	int tagline; /* file line where the tag starts */
	int charpos; /* character pos in the line */
	int tagcharpos; /* character pos where tag starts */
	int currbuflen;
	PerlIO *fd;
	char tagtype[TAGREADER_TAGTYPELEN + 1];
	char *buffer;
} *HTML__TagReader;

/* WIN32 stuff from: DH ,
 * http://testers.cpan.org/ */
#ifdef WIN32
#define THEINLINE __forceinline
#else
#define THEINLINE inline
#endif
/* start of a html tag (first char in the tag) */
static THEINLINE int is_start_of_tag(int ch){
	if (ch=='!' || ch=='/' || ch=='?' || isalnum(ch)){
		return(1);
	}
	return(0);
}

MODULE = HTML::TagReader	PACKAGE = HTML::TagReader	PREFIX = tr_

PROTOTYPES: ENABLE

HTML::TagReader
tr_new(class, filename)
	SV *class
	SV *filename
CODE:
	STRLEN i; // int
	char *str;
	if (!SvPOKp(filename)){
		croak("ERROR: filename must be a string scalar");
	}
	/* malloc and zero the struct */
        Newz(0, RETVAL, 1, struct trstuct );
	str=SvPV(filename,i);
	/* malloc */
        New(0, RETVAL->filename, i+1, char );
	strncpy(RETVAL->filename,str,i);
	/* malloc initial buffer */
        New(0, RETVAL->buffer, BUFFLEN+1, char );
	RETVAL->currbuflen=BUFFLEN;
	/* put a zero at the end of the string, perl might not do it */
	*(RETVAL->filename + i )=(char)0;
	RETVAL->fd=PerlIO_open(str,"r");
	if (RETVAL->fd == NULL){
		croak("ERROR: Can not read file \"%s\" ",str);
	}
	RETVAL->charpos=0;
	RETVAL->tagcharpos=0;
	RETVAL->fileline=1;
	RETVAL->tagline=0;
OUTPUT:
	RETVAL

void
DESTROY(self)
	HTML::TagReader self
CODE:
	Safefree(self->filename);
	Safefree(self->buffer);
	PerlIO_close(self->fd);
	Safefree(self);

void
tr_gettag(self,showerrors)
	HTML::TagReader self
	SV *showerrors
PREINIT:
	int bufpos;
	char ch;
	char chn;
	int state;
PPCODE:
        if (! self->fileline){
		croak("Object not initialized");
	}
	/* initialize */
	state=0;
	bufpos=0;
	ch=(char)0;
	chn=(char)0;
	self->tagline=self->fileline;
	/* find the next tag */
	while(state != 3 && (chn=PerlIO_getc(self->fd))!=EOF ){
		self->charpos++;
		if (ch==0){ /* read one more character ahead so we have always 2 */
			ch=chn;
			continue;
		}
		/* we can not run out of mem because TAGREADER_MAX_TAGLEN
		* is much smaller than BUFFLEN */
		if (bufpos > TAGREADER_MAX_TAGLEN){
			if (SvTRUE(showerrors)){
				PerlIO_printf(PerlIO_stderr(),"%s:%d:%d: Warning, tag not terminated or too long.\n",self->filename,self->tagline,self->charpos);
			}
			self->buffer[bufpos]=ch;bufpos++;
			self->buffer[bufpos]=(char)0;bufpos++;
			state=3;
			continue; /* jump out of while */
		}
		if (ch=='\n') {
			self->fileline++;
			self->charpos=0;
		}
		if (ch=='\n'|| ch=='\r' || ch=='\t' || ch==' ') {
			ch=' ';
			if (chn=='\n'|| chn=='\r' || chn=='\t' || chn==' '){
				/* delete mupltiple spaces */
				ch=chn; /* shift next char */
				continue;
			}
		}
		switch (state) {
		/*---*/
			case 0:
			/* outside of tag and we start tag here*/
			if (ch=='<') {
				if (is_start_of_tag(chn)) {
					self->buffer[0]=(char)0;
					bufpos=0;
					self->tagcharpos=self->charpos;
					/*line where tag starts*/
					self->tagline=self->fileline;
					self->buffer[bufpos]=ch;bufpos++;
					state=1;
				}else{
					if (SvTRUE(showerrors)){
						PerlIO_printf(PerlIO_stderr(),"%s:%d:%d: Warning, single \'<\' should be written as <\n",self->filename,self->fileline,self->charpos);
					}
				}
			}
			break;
		/*---*/
			case 1:
			self->buffer[bufpos]=ch;bufpos++;
			if (ch=='!' && chn=='-' && self->buffer[bufpos-2]=='<'){
				/* start of comment handling */
				state=30;
			}
			if (ch=='>'){
				state=3; /* note the exit state is hardcoded
				          * as well in the while loop above */
				self->buffer[bufpos]=(char)0;bufpos++;
			}
			if(ch=='<'){
				/* the tag that we were reading was not terminated but instead we ge a new opening */
				if (SvTRUE(showerrors)){
					PerlIO_printf(PerlIO_stderr(),"%s:%d:%d: Warning, \'>\' inside a tag should be written as >\n",self->filename,self->tagline,self->charpos);
				}
				state=1;
				bufpos=0;
				self->buffer[bufpos]=ch;bufpos++;
				self->tagline=self->fileline;
			}
			break;
		/*---*/
			case 30: /*comment handling,
				*we have found "