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hparser.c
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/*
* Copyright 1999-2016, Gisle Aas
* Copyright 1999-2000, Michael A. Chase
*
* This library is free software; you can redistribute it and/or
* modify it under the same terms as Perl itself.
*/
#ifndef EXTERN
#define EXTERN extern
#endif
#include "hctype.h" /* isH...() macros */
#include "tokenpos.h" /* dTOKEN; PUSH_TOKEN() */
const static
struct literal_tag {
int len;
char* str;
int is_cdata;
}
literal_mode_elem[] =
{
{6, "script", 1},
{5, "style", 1},
{3, "xmp", 1},
{6, "iframe", 1},
{9, "plaintext", 1},
{5, "title", 0},
{8, "textarea", 0},
{0, 0, 0}
};
enum argcode {
ARG_SELF = 1, /* need to avoid '\0' in argspec string */
ARG_TOKENS,
ARG_TOKENPOS,
ARG_TOKEN0,
ARG_TAGNAME,
ARG_TAG,
ARG_ATTR,
ARG_ATTRARR,
ARG_ATTRSEQ,
ARG_TEXT,
ARG_DTEXT,
ARG_IS_CDATA,
ARG_SKIPPED_TEXT,
ARG_OFFSET,
ARG_OFFSET_END,
ARG_LENGTH,
ARG_LINE,
ARG_COLUMN,
ARG_EVENT,
ARG_UNDEF,
ARG_LITERAL, /* Always keep last */
/* extra flags always encoded first */
ARG_FLAG_FLAT_ARRAY
};
static const char * const argname[] = {
/* Must be in the same order as enum argcode */
"self", /* ARG_SELF */
"tokens", /* ARG_TOKENS */
"tokenpos", /* ARG_TOKENPOS */
"token0", /* ARG_TOKEN0 */
"tagname", /* ARG_TAGNAME */
"tag", /* ARG_TAG */
"attr", /* ARG_ATTR */
"@attr", /* ARG_ATTRARR */
"attrseq", /* ARG_ATTRSEQ */
"text", /* ARG_TEXT */
"dtext", /* ARG_DTEXT */
"is_cdata", /* ARG_IS_CDATA */
"skipped_text", /* ARG_SKIPPED_TEXT */
"offset", /* ARG_OFFSET */
"offset_end", /* ARG_OFFSET_END */
"length", /* ARG_LENGTH */
"line", /* ARG_LINE */
"column", /* ARG_COLUMN */
"event", /* ARG_EVENT */
"undef", /* ARG_UNDEF */
/* ARG_LITERAL (not compared) */
/* ARG_FLAG_FLAT_ARRAY */
};
/* https://meiert.com/en/blog/boolean-attributes-of-html/ */
const static struct boolean_attribute {
int len;
const char* str;
}
boolean_attributes[] = {
{15, "allowfullscreen"},
{19, "allowpaymentrequest"},
{5, "async"},
{9, "autofocus"},
{8, "autoplay"},
{7, "checked"},
{8, "controls"},
{7, "default"},
{8, "disabled"},
{14, "formnovalidate"},
{6, "hidden"},
{5, "ismap"},
{9, "itemscope"},
{4, "loop"},
{8, "multiple"},
{5, "muted"},
{8, "nomodule"},
{10, "novalidate"},
{4, "open"},
{11, "playsinline"},
{8, "readonly"},
{8, "required"},
{8, "reversed"},
{8, "selected"},
{9, "truespeed"},
{0, 0}
};
#define CASE_SENSITIVE(p_state) \
((p_state)->xml_mode || (p_state)->case_sensitive)
#define STRICT_NAMES(p_state) \
((p_state)->xml_mode || (p_state)->strict_names)
#define ALLOW_EMPTY_TAG(p_state) \
((p_state)->xml_mode || (p_state)->empty_element_tags)
static void flush_pending_text(PSTATE* p_state, SV* self);
/*
* Parser functions.
*
* parse() - top level entry point.
* deals with text and calls one of its
* subordinate parse_*() routines after
* looking at the first char after "<"
* parse_decl() - deals with declarations <!...>
* parse_comment() - deals with <!-- ... -->
* parse_marked_section - deals with <![ ... [ ... ]]>
* parse_end() - deals with end tags </...>
* parse_start() - deals with start tags <A...>
* parse_process() - deals with process instructions <?...>
* parse_null() - deals with anything else <....>
*
* report_event() - called whenever any of the parse*() routines
* has recongnized something.
*/
static void
report_event(PSTATE* p_state,
event_id_t event,
char *beg, char *end, U32 utf8,
token_pos_t *tokens, int num_tokens,
SV* self
)
{
struct p_handler *h;
dTHX;
dSP;
AV *array;
STRLEN my_na;
char *argspec;
char *s;
STRLEN offset;
STRLEN line;
STRLEN column;
#define CHR_DIST(a,b) (utf8 ? utf8_distance((U8*)(a),(U8*)(b)) : (a) - (b))
/* some events might still fire after a handler has signaled eof
* so suppress them here.
*/
if (p_state->eof)
return;
/* capture offsets */
offset = p_state->offset;
line = p_state->line;
column = p_state->column;
#if 0
{ /* used for debugging at some point */
char *s = beg;
int i;
/* print debug output */
switch(event) {
case E_DECLARATION: printf("DECLARATION"); break;
case E_COMMENT: printf("COMMENT"); break;
case E_START: printf("START"); break;
case E_END: printf("END"); break;
case E_TEXT: printf("TEXT"); break;
case E_PROCESS: printf("PROCESS"); break;
case E_NONE: printf("NONE"); break;
default: printf("EVENT #%d", event); break;
}
printf(" [");
while (s < end) {
if (*s == '\n') {
putchar('\\'); putchar('n');
}
else
putchar(*s);
s++;
}
printf("] %d\n", end - beg);
for (i = 0; i < num_tokens; i++) {
printf(" token %d: %d %d\n",
i,
tokens[i].beg - beg,
tokens[i].end - tokens[i].beg);
}
}
#endif
if (p_state->pending_end_tag && event != E_TEXT && event != E_COMMENT) {
token_pos_t t;
char dummy;
t.beg = p_state->pending_end_tag;
t.end = p_state->pending_end_tag + strlen(p_state->pending_end_tag);
p_state->pending_end_tag = 0;
report_event(p_state, E_END, &dummy, &dummy, 0, &t, 1, self);
SPAGAIN;
}
/* update offsets */
p_state->offset += CHR_DIST(end, beg);
if (line) {
char *s = beg;
char *nl = NULL;
while (s < end) {
if (*s == '\n') {
p_state->line++;
nl = s;
}
s++;
}
if (nl)
p_state->column = CHR_DIST(end, nl) - 1;
else
p_state->column += CHR_DIST(end, beg);
}
if (event == E_NONE)
goto IGNORE_EVENT;
#ifdef MARKED_SECTION
if (p_state->ms == MS_IGNORE)
goto IGNORE_EVENT;
#endif
/* tag filters */
if (p_state->ignore_tags || p_state->report_tags || p_state->ignore_elements) {
if (event == E_START || event == E_END) {
SV* tagname = p_state->tmp;
assert(num_tokens >= 1);
sv_setpvn(tagname, tokens[0].beg, tokens[0].end - tokens[0].beg);
if (utf8)
SvUTF8_on(tagname);
else
SvUTF8_off(tagname);
if (!CASE_SENSITIVE(p_state))
sv_lower(aTHX_ tagname);
if (p_state->ignoring_element) {
if (sv_eq(p_state->ignoring_element, tagname)) {
if (event == E_START)
p_state->ignore_depth++;
else if (--p_state->ignore_depth == 0) {
SvREFCNT_dec(p_state->ignoring_element);
p_state->ignoring_element = 0;
}
}
goto IGNORE_EVENT;
}
if (p_state->ignore_elements &&
hv_fetch_ent(p_state->ignore_elements, tagname, 0, 0))
{
if (event == E_START) {
p_state->ignoring_element = newSVsv(tagname);
p_state->ignore_depth = 1;
}
goto IGNORE_EVENT;
}
if (p_state->ignore_tags &&
hv_fetch_ent(p_state->ignore_tags, tagname, 0, 0))
{
goto IGNORE_EVENT;
}
if (p_state->report_tags &&
!hv_fetch_ent(p_state->report_tags, tagname, 0, 0))
{
goto IGNORE_EVENT;
}
}
else if (p_state->ignoring_element) {
goto IGNORE_EVENT;
}
}
h = &p_state->handlers[event];
if (!h->cb) {
/* event = E_DEFAULT; */
h = &p_state->handlers[E_DEFAULT];
if (!h->cb)
goto IGNORE_EVENT;
}
if (SvTYPE(h->cb) != SVt_PVAV && !SvTRUE(h->cb)) {
/* FALSE scalar ('' or 0) means IGNORE this event */
return;
}
if (p_state->unbroken_text && event == E_TEXT) {
/* should buffer text */
if (!p_state->pend_text)
p_state->pend_text = newSV(256);
if (SvOK(p_state->pend_text)) {
if (p_state->is_cdata != p_state->pend_text_is_cdata) {
flush_pending_text(p_state, self);
SPAGAIN;
goto INIT_PEND_TEXT;
}
}
else {
INIT_PEND_TEXT:
p_state->pend_text_offset = offset;
p_state->pend_text_line = line;
p_state->pend_text_column = column;
p_state->pend_text_is_cdata = p_state->is_cdata;
sv_setpvs(p_state->pend_text, "");
if (!utf8)
SvUTF8_off(p_state->pend_text);
}
if (utf8 && !SvUTF8(p_state->pend_text))
sv_utf8_upgrade(p_state->pend_text);
if (utf8 || !SvUTF8(p_state->pend_text)) {
sv_catpvn(p_state->pend_text, beg, end - beg);
}
else {
SV *tmp = newSVpvn(beg, end - beg);
sv_utf8_upgrade(tmp);
sv_catsv(p_state->pend_text, tmp);
SvREFCNT_dec(tmp);
}
return;
}
else if (p_state->pend_text && SvOK(p_state->pend_text)) {
flush_pending_text(p_state, self);
SPAGAIN;
}
/* At this point we have decided to generate an event callback */
argspec = h->argspec ? SvPV(h->argspec, my_na) : "";
if (SvTYPE(h->cb) == SVt_PVAV) {
if (*argspec == ARG_FLAG_FLAT_ARRAY) {
argspec++;
array = (AV*)h->cb;
}
else {
/* start sub-array for accumulator array */
array = newAV();
}
}
else {
array = 0;
if (*argspec == ARG_FLAG_FLAT_ARRAY)
argspec++;
/* start argument stack for callback */
ENTER;
SAVETMPS;
PUSHMARK(SP);
}
for (s = argspec; *s; s++) {
SV* arg = 0;
int push_arg = 1;
enum argcode argcode = (enum argcode)*s;
switch( argcode ) {
case ARG_SELF:
arg = sv_mortalcopy(self);
break;
case ARG_TOKENS:
if (num_tokens >= 1) {
AV* av = newAV();
SV* prev_token = &PL_sv_undef;
int i;
av_extend(av, num_tokens);
for (i = 0; i < num_tokens; i++) {
if (tokens[i].beg) {
prev_token = newSVpvn(tokens[i].beg, tokens[i].end-tokens[i].beg);
if (utf8)
SvUTF8_on(prev_token);
av_push(av, prev_token);
}
else { /* boolean */
av_push(av, p_state->bool_attr_val
? newSVsv(p_state->bool_attr_val)
: newSVsv(prev_token));
}
}
arg = sv_2mortal(newRV_noinc((SV*)av));
}
break;
case ARG_TOKENPOS:
if (num_tokens >= 1 && tokens[0].beg >= beg) {
AV* av = newAV();
int i;
av_extend(av, num_tokens*2);
for (i = 0; i < num_tokens; i++) {
if (tokens[i].beg) {
av_push(av, newSViv(CHR_DIST(tokens[i].beg, beg)));
av_push(av, newSViv(CHR_DIST(tokens[i].end, tokens[i].beg)));
}
else { /* boolean tag value */
av_push(av, newSViv(0));
av_push(av, newSViv(0));
}
}
arg = sv_2mortal(newRV_noinc((SV*)av));
}
break;
case ARG_TOKEN0:
case ARG_TAGNAME:
/* fall through */
case ARG_TAG:
if (num_tokens >= 1) {
arg = sv_2mortal(newSVpvn(tokens[0].beg,
tokens[0].end - tokens[0].beg));
if (utf8)
SvUTF8_on(arg);
if (!CASE_SENSITIVE(p_state) && argcode != ARG_TOKEN0)
sv_lower(aTHX_ arg);
if (argcode == ARG_TAG && event != E_START) {
char *e_type = "!##/#?#";
sv_insert(arg, 0, 0, &e_type[event], 1);
}
}
break;
case ARG_ATTR:
case ARG_ATTRARR:
if (event == E_START) {
HV* hv;
int i;
if (argcode == ARG_ATTR) {
hv = newHV();
arg = sv_2mortal(newRV_noinc((SV*)hv));
}
else {
#ifdef __GNUC__
/* gcc -Wall reports this variable as possibly used uninitialized */
hv = 0;
#endif
push_arg = 0; /* deal with argument pushing here */
}
for (i = 1; i < num_tokens; i += 2) {
int attrlen = tokens[i].end-tokens[i].beg;
SV* attrname = newSVpvn(tokens[i].beg, attrlen);
SV* attrval;
if (utf8)
SvUTF8_on(attrname);
if (tokens[i+1].beg) {
char *beg = tokens[i+1].beg;
STRLEN len = tokens[i+1].end - beg;
if (*beg == '"' || *beg == '\'' || (*beg == '`' && p_state->backquote)) {
assert(len >= 2 && *beg == beg[len-1]);
beg++; len -= 2;
}
attrval = newSVpvn(beg, len);
if (utf8)
SvUTF8_on(attrval);
if (!p_state->attr_encoded) {
if (p_state->utf8_mode) {
sv_utf8_decode(attrval);
sv_utf8_upgrade(attrval);
}
decode_entities(aTHX_ attrval, p_state->entity2char, 0);
if (p_state->utf8_mode)
SvUTF8_off(attrval);
}
}
else { /* boolean */
int i;
int found = 0;
for ( i = 0; boolean_attributes[i].len; i++ ) {
if( attrlen == boolean_attributes[i].len ) {
char *attrname_s = SvPVbyte_nolen(attrname);
const char *t = boolean_attributes[i].str;
int len = attrlen;
while(len) {
if(toLOWER(*attrname_s) != *t)
break;
attrname_s++;
t++;
if(!--len) {
/* this is a boolean attribute */
if (p_state->bool_attr_val)
attrval = newSVsv(p_state->bool_attr_val);
else
attrval = newSVsv(attrname);
}
found = 1;
}
}
}
/* no matches were found, so set attr to undef */
if (!found)
attrval = newSV(0);
}
if (!CASE_SENSITIVE(p_state))
sv_lower(aTHX_ attrname);
if (argcode == ARG_ATTR) {
if (hv_exists_ent(hv, attrname, 0) ||
!hv_store_ent(hv, attrname, attrval, 0)) {
SvREFCNT_dec(attrval);
}
SvREFCNT_dec(attrname);
}
else { /* ARG_ATTRARR */
if (array) {
av_push(array, attrname);
av_push(array, attrval);
}
else {
mXPUSHs(attrname);
mXPUSHs(attrval);
}
}
}
}
else if (argcode == ARG_ATTRARR) {
push_arg = 0;
}
break;
case ARG_ATTRSEQ: /* (v2 compatibility stuff) */
if (event == E_START) {
AV* av = newAV();
int i;
for (i = 1; i < num_tokens; i += 2) {
SV* attrname = newSVpvn(tokens[i].beg,
tokens[i].end-tokens[i].beg);
if (utf8)
SvUTF8_on(attrname);
if (!CASE_SENSITIVE(p_state))
sv_lower(aTHX_ attrname);
av_push(av, attrname);
}
arg = sv_2mortal(newRV_noinc((SV*)av));
}
break;
case ARG_TEXT:
arg = sv_2mortal(newSVpvn(beg, end - beg));
if (utf8)
SvUTF8_on(arg);
break;
case ARG_DTEXT:
if (event == E_TEXT) {
arg = sv_2mortal(newSVpvn(beg, end - beg));
if (utf8)
SvUTF8_on(arg);
if (!p_state->is_cdata) {
if (p_state->utf8_mode) {
sv_utf8_decode(arg);
sv_utf8_upgrade(arg);
}
decode_entities(aTHX_ arg, p_state->entity2char, 1);
if (p_state->utf8_mode)
SvUTF8_off(arg);
}
}
break;
case ARG_IS_CDATA:
if (event == E_TEXT) {
arg = boolSV(p_state->is_cdata);
}
break;
case ARG_SKIPPED_TEXT:
arg = sv_2mortal(p_state->skipped_text);
p_state->skipped_text = newSVpvs("");
break;
case ARG_OFFSET:
arg = sv_2mortal(newSViv(offset));
break;
case ARG_OFFSET_END:
arg = sv_2mortal(newSViv(offset + CHR_DIST(end, beg)));
break;
case ARG_LENGTH:
arg = sv_2mortal(newSViv(CHR_DIST(end, beg)));
break;
case ARG_LINE:
arg = sv_2mortal(newSViv(line));
break;
case ARG_COLUMN:
arg = sv_2mortal(newSViv(column));
break;
case ARG_EVENT:
assert(event >= 0 && event < EVENT_COUNT);
arg = sv_2mortal(newSVpv(event_id_str[event], 0));
break;
case ARG_LITERAL:
{
int len = (unsigned char)s[1];
arg = sv_2mortal(newSVpvn(s+2, len));
if (SvUTF8(h->argspec))
SvUTF8_on(arg);
s += len + 1;
}
break;
case ARG_UNDEF:
arg = sv_mortalcopy(&PL_sv_undef);
break;
default:
arg = sv_2mortal(newSVpvf("Bad argspec %d", *s));
break;
}
if (push_arg) {
if (!arg)
arg = sv_mortalcopy(&PL_sv_undef);
if (array) {
/* have to fix mortality here or add mortality to
* XPUSHs after removing it from the switch cases.
*/
av_push(array, SvREFCNT_inc(arg));
}
else {
XPUSHs(arg);
}
}
}
if (array) {
if (array != (AV*)h->cb)
av_push((AV*)h->cb, newRV_noinc((SV*)array));
}
else {
PUTBACK;
if ((enum argcode)*argspec == ARG_SELF && !SvROK(h->cb)) {
char *method = SvPV(h->cb, my_na);
call_method(method, G_DISCARD | G_EVAL | G_VOID);
}
else {
call_sv(h->cb, G_DISCARD | G_EVAL | G_VOID);
}
if (SvTRUE(ERRSV)) {
RETHROW;
}
FREETMPS;
LEAVE;
}
if (p_state->skipped_text)
SvCUR_set(p_state->skipped_text, 0);
return;
IGNORE_EVENT:
if (p_state->skipped_text) {
if (event != E_TEXT && p_state->pend_text && SvOK(p_state->pend_text))
flush_pending_text(p_state, self);
if (utf8 && !SvUTF8(p_state->skipped_text))
sv_utf8_upgrade(p_state->skipped_text);
if (utf8 || !SvUTF8(p_state->skipped_text)) {
sv_catpvn(p_state->skipped_text, beg, end - beg);
}
else {
SV *tmp = newSVpvn(beg, end - beg);
sv_utf8_upgrade(tmp);
sv_catsv(p_state->skipped_text, tmp);
SvREFCNT_dec(tmp);
}
}
#undef CHR_DIST
return;
}
EXTERN SV*
argspec_compile(SV* src, PSTATE* p_state)
{
dTHX;
SV* argspec = newSVpvs("");
STRLEN len;
char *s = SvPV(src, len);
char *end = s + len;
if (SvUTF8(src))
SvUTF8_on(argspec);
while (isHSPACE(*s))
s++;
if (*s == '@') {
/* try to deal with '@{ ... }' wrapping */
char *tmp = s + 1;
while (isHSPACE(*tmp))
tmp++;
if (*tmp == '{') {
char c = ARG_FLAG_FLAT_ARRAY;
sv_catpvn(argspec, &c, 1);
tmp++;
while (isHSPACE(*tmp))
tmp++;
s = tmp;
}
}
while (s < end) {
if (isHNAME_FIRST(*s) || *s == '@') {
char *name = s;
int a = ARG_SELF;
const char * const *arg_name;
s++;
while (isHNAME_CHAR(*s))
s++;
/* check identifier */
for ( arg_name = argname; a < ARG_LITERAL ; ++a, ++arg_name ) {
if (strnEQ(*arg_name, name, s - name) &&
(*arg_name)[s - name] == '\0')
break;
}
if (a < ARG_LITERAL) {
char c = (unsigned char) a;
sv_catpvn(argspec, &c, 1);
if (a == ARG_LINE || a == ARG_COLUMN) {
if (!p_state->line)
p_state->line = 1; /* enable tracing of line/column */
}
if (a == ARG_SKIPPED_TEXT) {
if (!p_state->skipped_text) {
p_state->skipped_text = newSVpvs("");
}
}
if (a == ARG_ATTR || a == ARG_ATTRARR) {
if (p_state->argspec_entity_decode != ARG_DTEXT)
p_state->argspec_entity_decode = ARG_ATTR;
}
else if (a == ARG_DTEXT) {
p_state->argspec_entity_decode = ARG_DTEXT;
}
}
else {
croak("Unrecognized identifier %.*s in argspec", (int) (s - name), name);
}
}
else if (*s == '"' || *s == '\'') {
char *string_beg = s;
s++;
while (s < end && *s != *string_beg && *s != '\\')
s++;
if (*s == *string_beg) {
/* literal */
int len = s - string_beg - 1;
unsigned char buf[2];
if (len > 255)
croak("Literal string is longer than 255 chars in argspec");
buf[0] = ARG_LITERAL;
buf[1] = len;
sv_catpvn(argspec, (char*)buf, 2);
sv_catpvn(argspec, string_beg+1, len);
s++;
}
else if (*s == '\\') {
croak("Backslash reserved for literal string in argspec");
}
else {
croak("Unterminated literal string in argspec");
}
}
else {
croak("Bad argspec (%s)", s);
}
while (isHSPACE(*s))
s++;
if (*s == '}' && SvPVX(argspec)[0] == ARG_FLAG_FLAT_ARRAY) {
/* end of '@{ ... }' */
s++;
while (isHSPACE(*s))
s++;
if (s < end)
croak("Bad argspec: stuff after @{...} (%s)", s);
}
if (s == end)
break;
if (*s != ',') {
croak("Missing comma separator in argspec");
}
s++;
while (isHSPACE(*s))
s++;
}
return argspec;
}
static void
flush_pending_text(PSTATE* p_state, SV* self)
{
dTHX;
bool old_unbroken_text = p_state->unbroken_text;
SV* old_pend_text = p_state->pend_text;
bool old_is_cdata = p_state->is_cdata;
STRLEN old_offset = p_state->offset;
STRLEN old_line = p_state->line;
STRLEN old_column = p_state->column;
assert(p_state->pend_text && SvOK(p_state->pend_text));
p_state->unbroken_text = 0;
p_state->pend_text = 0;
p_state->is_cdata = p_state->pend_text_is_cdata;
p_state->offset = p_state->pend_text_offset;
p_state->line = p_state->pend_text_line;
p_state->column = p_state->pend_text_column;
report_event(p_state, E_TEXT,
SvPVX(old_pend_text), SvEND(old_pend_text),
SvUTF8(old_pend_text), 0, 0, self);
SvOK_off(old_pend_text);
p_state->unbroken_text = old_unbroken_text;
p_state->pend_text = old_pend_text;
p_state->is_cdata = old_is_cdata;
p_state->offset = old_offset;
p_state->line = old_line;
p_state->column = old_column;
}
static char*
skip_until_gt(char *beg, char *end)
{
/* tries to emulate quote skipping behaviour observed in MSIE */
char *s = beg;
char quote = '\0';
char prev = ' ';
while (s < end) {
if (!quote && *s == '>')
return s;
if (*s == '"' || *s == '\'') {
if (*s == quote) {
quote = '\0'; /* end of quoted string */
}
else if (!quote && (prev == ' ' || prev == '=')) {
quote = *s;
}
}
prev = *s++;
}
return end;
}
static char*
parse_comment(PSTATE* p_state, char *beg, char *end, U32 utf8, SV* self)
{
char *s = beg;
if (p_state->strict_comment) {
dTOKENS(4);
char *start_com = s; /* also used to signal inside/outside */
while (1) {
/* try to locate "--" */
FIND_DASH_DASH:
/* printf("find_dash_dash: [%s]\n", s); */
while (s < end && *s != '-' && *s != '>')
s++;
if (s == end) {
FREE_TOKENS;
return beg;
}
if (*s == '>') {
s++;
if (start_com)
goto FIND_DASH_DASH;
/* we are done recognizing all comments, make callbacks */
report_event(p_state, E_COMMENT,
beg - 4, s, utf8,
tokens, num_tokens,
self);
FREE_TOKENS;
return s;
}
s++;
if (s == end) {
FREE_TOKENS;
return beg;
}
if (*s == '-') {
/* two dashes in a row seen */
s++;
/* do something */
if (start_com) {
PUSH_TOKEN(start_com, s-2);
start_com = 0;
}
else {
start_com = s;
}
}
}
}
else if (p_state->no_dash_dash_comment_end) {
token_pos_t token;
token.beg = beg;
/* a lone '>' signals end-of-comment */
while (s < end && *s != '>')
s++;
token.end = s;
if (s < end) {
s++;
report_event(p_state, E_COMMENT, beg-4, s, utf8, &token, 1, self);
return s;
}
else {
return beg;
}
}
else { /* non-strict comment */
token_pos_t token;
token.beg = beg;
/* try to locate /--\s*>/ which signals end-of-comment */
LOCATE_END:
while (s < end && *s != '-')
s++;
token.end = s;
if (s < end) {
s++;
if (*s == '-') {
s++;
while (isHSPACE(*s))
s++;
if (*s == '>') {
s++;
/* yup */
report_event(p_state, E_COMMENT, beg-4, s, utf8, &token, 1, self);
return s;
}
}
if (s < end) {
s = token.end + 1;
goto LOCATE_END;
}
}
if (s == end)
return beg;
}
return 0;
}