giomba/nes-proj
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity
7eeed4d6af
nes-proj/apps/webbrowser/htmlparser.c

853 lines
22 KiB
C
Raw Blame History

/*
* Copyright (c) 2002, Adam Dunkels.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* This file is part of the Contiki desktop environment
*
* $Id: htmlparser.c,v 1.1 2006/06/17 22:41:13 adamdunkels Exp $
*
*/
/* htmlparser.c:
*
* Implements a very simplistic HTML parser. It recognizes HTML links
* (<a href>-tags), HTML img alt tags, a few text flow break tags
G * (<br>, <p>, <h>), the <li> tag (but does not even try to
* distinguish between <ol> or <ul>) as well as HTML comment tags
* (<!-- -->).
*
* To save memory, the HTML parser is state machine driver, which
* means that it will shave off one character from the HTML page,
* process that character, and return to the next. Another way of
* doing it would be to buffer a number of characters and process them
* together.
*
* The main function in this file is the htmlparser_parse() function
* which takes a htmlparser_state structur and a part of an HTML file
* as an argument. The htmlparser_parse() function will call the
* helper functions parse_char() and parse_tag(). Those functions will
* in turn call the two callback functions htmlparser_char() and
* htmlparser_tag(). Those functions must be implemented by the using
* module (e.g., a web browser program).
*
* htmlparser_char() will be called for every non-tag character.
*
* htmlparser_tag() will be called whenever a full tag has been found.
*
*/
#include "htmlparser.h"
#include "html-strings.h"
#include "contiki.h"
#include <string.h>
#if 1
#define PRINTF(x)
#else
#include <stdio.h>
#define PRINTF(x) printf x
#endif
/*-----------------------------------------------------------------------------------*/
#define ISO_A 0x41
#define ISO_B 0x42
#define ISO_E 0x45
#define ISO_F 0x46
#define ISO_G 0x47
#define ISO_H 0x48
#define ISO_I 0x49
#define ISO_L 0x4c
#define ISO_M 0x4d
#define ISO_P 0x50
#define ISO_R 0x52
#define ISO_T 0x54
#define ISO_a (ISO_A | 0x20)
#define ISO_b (ISO_B | 0x20)
#define ISO_e (ISO_E | 0x20)
#define ISO_f (ISO_F | 0x20)
#define ISO_g (ISO_G | 0x20)
#define ISO_h (ISO_H | 0x20)
#define ISO_i (ISO_I | 0x20)
#define ISO_l (ISO_L | 0x20)
#define ISO_m (ISO_M | 0x20)
#define ISO_p (ISO_P | 0x20)
#define ISO_r (ISO_R | 0x20)
#define ISO_t (ISO_T | 0x20)
#define ISO_ht 0x09
#define ISO_nl 0x0a
#define ISO_cr 0x0d
#define ISO_space 0x20
#define ISO_bang 0x21
#define ISO_citation 0x22
#define ISO_ampersand 0x26
#define ISO_citation2 0x27
#define ISO_asterisk 0x2a
#define ISO_dash 0x2d
#define ISO_slash 0x2f
#define ISO_semicolon 0x3b
#define ISO_lt 0x3c
#define ISO_eq 0x3d
#define ISO_gt 0x3e
#define ISO_rbrack 0x5b
#define ISO_lbrack 0x5d
#define MINORSTATE_NONE 0
#define MINORSTATE_TEXT 1 /* Parse normal text */
#define MINORSTATE_EXTCHAR 2 /* Check for semi-colon */
#define MINORSTATE_TAG 3 /* Check for name of tag. */
#define MINORSTATE_TAGEND 4 /* Scan for end of tag. */
#define MINORSTATE_TAGATTR 5 /* Parse tag attr. */
#define MINORSTATE_TAGATTRSPACE 6 /* Parse optional space after tag
attr. */
#define MINORSTATE_TAGATTRPARAM 7 /* Parse tag attr parameter. */
#define MINORSTATE_TAGATTRPARAMNQ 8 /* Parse tag attr parameter without
quotation marks. */
#define MINORSTATE_HTMLCOMMENT 9 /* Scan for HTML comment end */
#define MAJORSTATE_NONE 0
#define MAJORSTATE_BODY 1
#define MAJORSTATE_LINK 2
#define MAJORSTATE_FORM 3
#define MAJORSTATE_DISCARD 4
struct htmlparser_state {
unsigned char minorstate;
char tag[20];
unsigned char tagptr;
char tagattr[20];
unsigned char tagattrptr;
char tagattrparam[WWW_CONF_MAX_URLLEN];
unsigned char tagattrparamptr;
unsigned char lastchar, quotechar;
unsigned char majorstate, lastmajorstate;
char linkurl[WWW_CONF_MAX_URLLEN];
#define MAX_WORDLEN 40
char word[MAX_WORDLEN];
unsigned char wordlen;
#if WWW_CONF_FORMS
char formaction[WWW_CONF_MAX_FORMACTIONLEN];
char formname[WWW_CONF_MAX_FORMNAMELEN];
unsigned char inputtype;
char inputname[WWW_CONF_MAX_INPUTNAMELEN];
char inputvalue[WWW_CONF_MAX_INPUTVALUELEN];
unsigned char inputvaluesize;
#endif /* WWW_CONF_FORMS */
};
static struct htmlparser_state s;
/*-----------------------------------------------------------------------------------*/
static char last[1] = {0xff};
static const char *tags[] = {
#define TAG_FIRST 0
#define TAG_SLASHA 0
html_slasha,
#define TAG_SLASHCENTER 1
html_slashcenter,
#define TAG_SLASHFORM 2
html_slashform,
#define TAG_SLASHH 3
html_slashh,
#define TAG_SLASHSCRIPT 4
html_slashscript,
#define TAG_SLASHSELECT 5
html_slashselect,
#define TAG_SLASHSTYLE 6
html_slashstyle,
#define TAG_A 7
html_a,
#define TAG_BODY 8
html_body,
#define TAG_BR 9
html_br,
#define TAG_CENTER 10
html_center,
#define TAG_FORM 11
html_form,
#define TAG_FRAME 12
html_frame,
#define TAG_H1 13
html_h1,
#define TAG_H2 14
html_h2,
#define TAG_H3 15
html_h3,
#define TAG_H4 16
html_h4,
#define TAG_IMG 17
html_img,
#define TAG_INPUT 18
html_input,
#define TAG_LI 19
html_li,
#define TAG_P 20
html_p,
#define TAG_SCRIPT 21
html_script,
#define TAG_SELECT 22
html_select,
#define TAG_STYLE 23
html_style,
#define TAG_TR 24
html_tr,
#define TAG_LAST 25
last,
};
/*-----------------------------------------------------------------------------------*/
static unsigned char CC_FASTCALL
iswhitespace(char c)
{
return (c == ISO_space ||
c == ISO_nl ||
c == ISO_cr ||
c == ISO_ht);
}
/*-----------------------------------------------------------------------------------*/
void
htmlparser_init(void)
{
s.majorstate = s.lastmajorstate = MAJORSTATE_DISCARD;
s.minorstate = MINORSTATE_TEXT;
s.lastchar = 0;
}
/*-----------------------------------------------------------------------------------*/
static char CC_FASTCALL
lowercase(char c)
{
/* XXX: This is a *brute force* approach to lower-case
converting and should *not* be used anywhere else! It
works for our purposes, however (i.e., HTML tags). */
if(c > 0x40) {
return (c & 0x1f) | 0x60;
} else {
return c;
}
}
/*-----------------------------------------------------------------------------------*/
static void
endtagfound(void)
{
s.tag[s.tagptr] = 0;
s.tagattr[s.tagattrptr] = 0;
s.tagattrparam[s.tagattrparamptr] = 0;
}
/*-----------------------------------------------------------------------------------*/
static void CC_FASTCALL
switch_majorstate(unsigned char newstate)
{
if(s.majorstate != newstate) {
PRINTF(("Switching state from %d to %d (%d)\n", s.majorstate, newstate, s.lastmajorstate));
s.lastmajorstate = s.majorstate;
s.majorstate = newstate;
}
}
/*-----------------------------------------------------------------------------------*/
static void CC_FASTCALL
add_char(unsigned char c)
{
if(s.wordlen < MAX_WORDLEN &&
c < 0x80) {
s.word[s.wordlen] = c;
++s.wordlen;
if(s.wordlen == MAX_WORDLEN) {
s.wordlen = MAX_WORDLEN - 1;
}
}
}
/*-----------------------------------------------------------------------------------*/
static void
do_word(void)
{
if(s.wordlen > 0) {
if(s.majorstate == MAJORSTATE_LINK) {
if(s.word[s.wordlen] != ISO_space) {
add_char(ISO_space);
}
} else if(s.majorstate == MAJORSTATE_DISCARD) {
s.wordlen = 0;
} else {
s.word[s.wordlen] = '\0';
htmlparser_word(s.word, s.wordlen);
s.wordlen = 0;
}
}
}
/*-----------------------------------------------------------------------------------*/
static void
newline(void)
{
do_word();
htmlparser_newline();
}
/*-----------------------------------------------------------------------------------*/
static unsigned char CC_FASTCALL
find_tag(char *tag)
{
static unsigned char first, last, i, tabi;
static char tagc;
first = TAG_FIRST;
last = TAG_LAST;
i = 0;
do {
tagc = tag[i];
if(tagc == 0 &&
tags[first][i] == 0) {
return first;
}
tabi = first;
/* First, find first matching tag from table. */
while(tagc > (tags[tabi])[i] &&
tabi < last) {
++tabi;
}
first = tabi;
/* Second, find last matching tag from table. */
while(tagc == (tags[tabi])[i] &&
tabi < last) {
++tabi;
}
last = tabi;
/* If first and last matching tags are equal, we have a non-match
and return. Else we continue with the next character. */
++i;
} while(last != first);
return TAG_LAST;
}
/*-----------------------------------------------------------------------------------*/
static void
parse_tag(void)
{
static char *tagattrparam;
static unsigned char size, i;
static char dummy;
PRINTF(("Parsing tag '%s' '%s' '%s'\n",
s.tag, s.tagattr, s.tagattrparam));
switch(find_tag(s.tag)) {
case TAG_P:
case TAG_H1:
case TAG_H2:
case TAG_H3:
case TAG_H4:
/* parse_char(ISO_nl);*/
newline();
/* FALLTHROUGH */
case TAG_BR:
case TAG_TR:
case TAG_SLASHH:
/* parse_char(ISO_nl);*/
dummy = 0;
newline();
break;
case TAG_LI:
newline();
add_char(ISO_asterisk);
add_char(ISO_space);
break;
case TAG_SCRIPT:
case TAG_STYLE:
case TAG_SELECT:
switch_majorstate(MAJORSTATE_DISCARD);
break;
case TAG_SLASHSCRIPT:
case TAG_SLASHSTYLE:
case TAG_SLASHSELECT:
switch_majorstate(s.lastmajorstate);
break;
case TAG_BODY:
s.majorstate = s.lastmajorstate = MAJORSTATE_BODY;
break;
case TAG_FRAME:
if(strncmp(s.tagattr, html_src, sizeof(html_src)) == 0 &&
s.tagattrparam[0] != 0) {
switch_majorstate(MAJORSTATE_BODY);
newline();
add_char(ISO_rbrack);
do_word();
htmlparser_link((char *)html_frame, strlen(html_frame), s.tagattrparam);
PRINTF(("Frame [%s]\n", s.tagattrparam));
add_char(ISO_lbrack);
newline();
}
break;
case TAG_IMG:
if(strncmp(s.tagattr, html_alt, sizeof(html_alt)) == 0 &&
s.tagattrparam[0] != 0) {
/* parse_char(ISO_lt);*/
add_char(ISO_lt);
tagattrparam = &s.tagattrparam[0];
while(*tagattrparam) {
/* parse_char(*tagattrparam);*/
add_char(*tagattrparam);
++tagattrparam;
}
/* parse_char(ISO_gt);*/
add_char(ISO_gt);
do_word();
}
break;
case TAG_A:
PRINTF(("A %s %s\n", s.tagattr, s.tagattrparam));
if(strncmp(s.tagattr, html_href, sizeof(html_href)) == 0 &&
s.tagattrparam[0] != 0) {
strcpy(s.linkurl, s.tagattrparam);
do_word();
switch_majorstate(MAJORSTATE_LINK);
}
break;
case TAG_SLASHA:
if(s.majorstate == MAJORSTATE_LINK) {
switch_majorstate(s.lastmajorstate);
s.word[s.wordlen] = 0;
htmlparser_link(s.word, s.wordlen, s.linkurl);
s.wordlen = 0;
}
break;
#if WWW_CONF_FORMS
case TAG_FORM:
PRINTF(("Form tag\n"));
switch_majorstate(MAJORSTATE_FORM);
if(strncmp(s.tagattr, html_action, sizeof(html_action)) == 0) {
PRINTF(("Form action '%s'\n", s.tagattrparam));
strncpy(s.formaction, s.tagattrparam, WWW_CONF_MAX_FORMACTIONLEN - 1);
} else if(strncmp(s.tagattr, html_name, sizeof(html_name)) == 0) {
PRINTF(("Form name '%s'\n", s.tagattrparam));
strncpy(s.formname, s.tagattrparam, WWW_CONF_MAX_FORMNAMELEN - 1);
}
s.inputname[0] = s.inputvalue[0] = 0;
break;
case TAG_SLASHFORM:
switch_majorstate(MAJORSTATE_BODY);
s.formaction[0] = s.formname[0] = 0;
break;
case TAG_INPUT:
if(s.majorstate == MAJORSTATE_FORM) {
/* First check if we are called at the end of an input tag. If
so, we should render the input widget. */
if(s.tagattr[0] == 0 &&
s.inputname[0] != 0) {
PRINTF(("Render input type %d\n", s.inputtype));
switch(s.inputtype) {
case HTMLPARSER_INPUTTYPE_NONE:
case HTMLPARSER_INPUTTYPE_TEXT:
for(i = 0; i < s.inputvaluesize; ++i) {
if(s.inputvalue[i] == 0) {
memset(&s.inputvalue[i], ISO_space, s.inputvaluesize - i);
s.inputvalue[s.inputvaluesize] = 0;
break;
}
}
htmlparser_inputfield(s.inputvalue, s.inputname,
s.formname, s.formaction);
break;
case HTMLPARSER_INPUTTYPE_SUBMIT:
case HTMLPARSER_INPUTTYPE_IMAGE:
htmlparser_submitbutton(s.inputvalue, s.inputname,
s.formname, s.formaction);
break;
}
s.inputtype = HTMLPARSER_INPUTTYPE_NONE;
} else {
PRINTF(("Input '%s' '%s'\n", s.tagattr, s.tagattrparam));
if(strncmp(s.tagattr, html_type, sizeof(html_type)) == 0) {
if(strncmp(s.tagattrparam, html_submit,
sizeof(html_submit)) == 0) {
s.inputtype = HTMLPARSER_INPUTTYPE_SUBMIT;
} else if(strncmp(s.tagattrparam, html_image,
sizeof(html_image)) == 0) {
s.inputtype = HTMLPARSER_INPUTTYPE_IMAGE;
} else if(strncmp(s.tagattrparam, html_text,
sizeof(html_text)) == 0) {
s.inputtype = HTMLPARSER_INPUTTYPE_TEXT;
} else {
s.inputtype = HTMLPARSER_INPUTTYPE_OTHER;
}
} else if(strncmp(s.tagattr, html_name,
sizeof(html_name)) == 0) {
strncpy(s.inputname, s.tagattrparam,
WWW_CONF_MAX_INPUTNAMELEN);
} else if(strncmp(s.tagattr, html_alt,
sizeof(html_alt)) == 0 &&
s.inputtype == HTMLPARSER_INPUTTYPE_IMAGE) {
strncpy(s.inputvalue, s.tagattrparam,
WWW_CONF_MAX_INPUTVALUELEN);
} else if(strncmp(s.tagattr, html_value,
sizeof(html_value)) == 0) {
strncpy(s.inputvalue, s.tagattrparam,
WWW_CONF_MAX_INPUTVALUELEN);
} else if(strncmp(s.tagattr, html_size,
sizeof(html_size)) == 0) {
size = 0;
if(s.tagattrparam[0] >= '0' &&
s.tagattrparam[0] <= '9') {
size = s.tagattrparam[0] - '0';
if(s.tagattrparam[1] >= '0' &&
s.tagattrparam[1] <= '9') {
size = size * 10 + (s.tagattrparam[1] - '0');
}
}
if(size >= WWW_CONF_MAX_INPUTVALUELEN) {
size = WWW_CONF_MAX_INPUTVALUELEN - 1;
}
s.inputvaluesize = size;
/* strncpy(s.inputvalue, s.tagattrparam,
WWW_CONF_MAX_INPUTVALUELEN);*/
}
}
}
break;
#endif /* WWW_CONF_FORMS */
#if WWW_CONF_RENDERSTATE
case TAG_CENTER:
/* parse_char(ISO_nl); */
newline();
htmlparser_renderstate(HTMLPARSER_RENDERSTATE_BEGIN |
HTMLPARSER_RENDERSTATE_CENTER);
break;
case TAG_SLASHCENTER:
/* parse_char(ISO_nl);*/
newline();
htmlparser_renderstate(HTMLPARSER_RENDERSTATE_END |
HTMLPARSER_RENDERSTATE_CENTER);
break;
#endif /* WWW_CONF_RENDERSTATE */
}
}
/*-----------------------------------------------------------------------------------*/
static u16_t
parse_word(char *data, u8_t dlen)
{
static u8_t i;
static u8_t len;
unsigned char c;
len = dlen;
switch(s.minorstate) {
case MINORSTATE_TEXT:
for(i = 0; i < len; ++i) {
c = data[i];
if(iswhitespace(c)) {
do_word();
} else if(c == ISO_lt) {
s.minorstate = MINORSTATE_TAG;
s.tagptr = 0;
/* do_word();*/
break;
} else if(c == ISO_ampersand) {
s.minorstate = MINORSTATE_EXTCHAR;
break;
} else {
add_char(c);
}
}
break;
case MINORSTATE_EXTCHAR:
for(i = 0; i < len; ++i) {
c = data[i];
if(c == ISO_semicolon) {
s.minorstate = MINORSTATE_TEXT;
add_char(' ');
break;
} else if(iswhitespace(c)) {
s.minorstate = MINORSTATE_TEXT;
add_char('&');
add_char(' ');
break;
}
}
break;
case MINORSTATE_TAG:
/* We are currently parsing within the name of a tag. We check
for the end of a tag (the '>' character) or whitespace (which
indicates that we should parse a tag attr argument
instead). */
for(i = 0; i < len; ++i) {
c = data[i];
if(c == ISO_gt) {
/* Full tag found. We continue parsing regular text. */
s.minorstate = MINORSTATE_TEXT;
s.tagattrptr = s.tagattrparamptr = 0;
endtagfound();
parse_tag();
break;
} else if(iswhitespace(c)) {
/* The name of the tag found. We continue parsing the tag
attr.*/
s.minorstate = MINORSTATE_TAGATTR;
s.tagattrptr = 0;
endtagfound();
break;
} else {
/* Keep track of the name of the tag, but convert it to
lower case. */
s.tag[s.tagptr] = lowercase(c);
++s.tagptr;
/* Check if the ->tag field is full. If so, we just eat up
any data left in the tag. */
if(s.tagptr == sizeof(s.tag)) {
s.minorstate = MINORSTATE_TAGEND;
break;
}
}
/* Check for HTML comment, indicated by <!-- */
if(s.tagptr == 3 &&
s.tag[0] == ISO_bang &&
s.tag[1] == ISO_dash &&
s.tag[2] == ISO_dash) {
PRINTF(("Starting comment...\n"));
s.minorstate = MINORSTATE_HTMLCOMMENT;
s.tagptr = 0;
endtagfound();
break;
}
}
break;
case MINORSTATE_TAGATTR:
/* We parse the "tag attr", i.e., the "href" in <a
href="...">. */
for(i = 0; i < len; ++i) {
c = data[i];
if(c == ISO_gt) {
/* Full tag found. */
s.minorstate = MINORSTATE_TEXT;
s.tagattrparamptr = 0;
s.tagattrptr = 0;
endtagfound();
parse_tag();
s.tagptr = 0;
endtagfound();
break;
} else if(iswhitespace(c)) {
if(s.tagattrptr == 0) {
/* Discard leading spaces. */
} else {
/* A non-leading space is the end of the attribute. */
s.tagattrparamptr = 0;
endtagfound();
parse_tag();
s.minorstate = MINORSTATE_TAGATTRSPACE;
break;
/* s.tagattrptr = 0;
endtagfound();*/
}
} else if(c == ISO_eq) {
s.minorstate = MINORSTATE_TAGATTRPARAMNQ;
s.tagattrparamptr = 0;
endtagfound();
break;
} else {
s.tagattr[s.tagattrptr] = lowercase(c);
++s.tagattrptr;
/* Check if the "tagattr" field is full. If so, we just eat
up any data left in the tag. */
if(s.tagattrptr == sizeof(s.tagattr)) {
s.minorstate = MINORSTATE_TAGEND;
break;
}
}
}
break;
case MINORSTATE_TAGATTRSPACE:
for(i = 0; i < len; ++i) {
c = data[i];
if(iswhitespace(c)) {
/* Discard spaces. */
} else if(c == ISO_eq) {
s.minorstate = MINORSTATE_TAGATTRPARAMNQ;
s.tagattrparamptr = 0;
endtagfound();
parse_tag();
break;
} else {
s.tagattr[0] = lowercase(c);
s.tagattrptr = 1;
s.minorstate = MINORSTATE_TAGATTR;
break;
}
}
break;
case MINORSTATE_TAGATTRPARAMNQ:
/* We are parsing the "tag attr parameter", i.e., the link part
in <a href="link">. */
for(i = 0; i < len; ++i) {
c = data[i];
if(c == ISO_gt) {
/* Full tag found. */
endtagfound();
parse_tag();
s.minorstate = MINORSTATE_TEXT;
s.tagattrptr = 0;
endtagfound();
parse_tag();
s.tagptr = 0;
endtagfound();
break;
} else if(iswhitespace(c) &&
s.tagattrparamptr == 0) {
/* Discard leading spaces. */
} else if((c == ISO_citation ||
c == ISO_citation2) &&
s.tagattrparamptr == 0) {
s.minorstate = MINORSTATE_TAGATTRPARAM;
s.quotechar = c;
PRINTF(("tag attr param q found\n"));
break;
} else if(iswhitespace(c)) {
PRINTF(("Non-leading space found at %d\n",
s.tagattrparamptr));
/* Stop parsing if a non-leading space was found */
endtagfound();
parse_tag();
s.minorstate = MINORSTATE_TAGATTR;
s.tagattrptr = 0;
endtagfound();
break;
} else {
s.tagattrparam[s.tagattrparamptr] = c;
++s.tagattrparamptr;
/* Check if the "tagattr" field is full. If so, we just eat
up any data left in the tag. */
if(s.tagattrparamptr >= sizeof(s.tagattrparam) - 1) {
s.minorstate = MINORSTATE_TAGEND;
break;
}
}
}
break;
case MINORSTATE_TAGATTRPARAM:
/* We are parsing the "tag attr parameter", i.e., the link
part in <a href="link">. */
for(i = 0; i < len; ++i) {
c = data[i];
if(c == s.quotechar) {
/* Found end of tag attr parameter. */
endtagfound();
parse_tag();
s.minorstate = MINORSTATE_TAGATTR;
s.tagattrptr = 0;
endtagfound();
break;
} else {
if(iswhitespace(c)) {
s.tagattrparam[s.tagattrparamptr] = ISO_space;
} else {
s.tagattrparam[s.tagattrparamptr] = c;
}
++s.tagattrparamptr;
/* Check if the "tagattr" field is full. If so, we just eat
up any data left in the tag. */
if(s.tagattrparamptr >= sizeof(s.tagattrparam) - 1) {
s.minorstate = MINORSTATE_TAGEND;
break;
}
}
}
break;
case MINORSTATE_HTMLCOMMENT:
for(i = 0; i < len; ++i) {
c = data[i];
if(c == ISO_dash) {
++s.tagptr;
} else if(c == ISO_gt && s.tagptr > 0) {
PRINTF(("Comment done.\n"));
s.minorstate = MINORSTATE_TEXT;
break;
} else {
s.tagptr = 0;
}
}
break;
case MINORSTATE_TAGEND:
/* Discard characters until a '>' is seen. */
for(i = 0; i < len; ++i) {
if(data[i] == ISO_gt) {
s.minorstate = MINORSTATE_TEXT;
s.tagattrptr = 0;
endtagfound();
parse_tag();
break;
}
}
break;
default:
i = 0;
break;
}
if(i >= len) {
return len;
}
return i + 1;
}
/*-----------------------------------------------------------------------------------*/
void
htmlparser_parse(char *data, u16_t datalen)
{
u16_t plen;
while(datalen > 0) {
if(datalen > 255) {
plen = parse_word(data, 255);
} else {
plen = parse_word(data, datalen);
}
datalen -= plen;
data += plen;
}
}
/*-----------------------------------------------------------------------------------*/
Reference in New Issue View Git Blame Copy Permalink