ref: c7d9da8f5a41b833946027c802e0e8d7dd014b22
dir: /sys/src/cmd/aux/wikifmt.c/
/*
* google code wiki to html converter.
* https://code.google.com/p/support/wiki/WikiSyntax
*/
#include <u.h>
#include <libc.h>
enum {
HUNK = 8*1024,
};
char *buf;
char *pos;
char *epos;
char *opos;
int inquote = 0;
int intable = 0;
int inlist = 0;
int indent = -1;
void body(void);
int
match(char *s)
{
int n;
n = strlen(s);
if(pos+n > epos)
return 0;
return cistrncmp(pos, s, n) == 0;
}
int
got(char *s)
{
if(!match(s))
return 0;
pos += strlen(s);
return 1;
}
char*
look(char *s, char *e)
{
char *p;
int n;
if(e == nil)
e = epos;
n = strlen(s);
e -= n;
for(p = pos; p <= e; p++)
if(cistrncmp(p, s, n) == 0)
return p;
return nil;
}
void
eatspace(void)
{
while(pos < epos && (*pos == ' ' || *pos == '\t'))
pos++;
}
char*
trimback(char *s)
{
while(s > pos && strchr("\t ", s[-1]) != nil)
s--;
return s;
}
void
flush(void)
{
int n;
n = opos - buf;
if(n <= 0)
return;
if(write(1, buf, n) != n)
sysfatal("write: %r");
opos = buf;
}
void
output(char *s, int n)
{
int r;
if(n <= 0)
return;
r = HUNK - (opos - buf);
if(n > r){
output(s, r);
output(s+r, n-r);
} else {
memmove(opos, s, n);
opos += n;
if(r == n)
flush();
}
}
void
string(char *s)
{
output(s, strlen(s));
}
void
escape(char *e)
{
char *p;
for(p = pos; p < e; p++)
if(*p == '<'){
output(pos, p - pos);
pos = p+1;
string("<");
} else if(*p == '>'){
output(pos, p - pos);
pos = p+1;
string(">");
} else if(*p == '&'){
output(pos, p - pos);
pos = p+1;
string("&");
}
output(pos, p - pos);
pos = p;
}
void
ebody(char *e)
{
char *t;
t = epos;
epos = trimback(e);
body();
pos = e;
epos = t;
}
int
tag(char *term, char *tag)
{
char *e;
if(!got(term))
return 0;
if(e = look(term, nil)){
eatspace();
string("<"); string(tag); string(">");
ebody(e);
string("</"); string(tag); string(">");
pos += strlen(term);
} else
string(term);
return 1;
}
int
heading(void)
{
char *o, *s, *e;
int n;
for(s = "======"; *s; s++)
if(got(s))
break;
if(*s == 0)
return 0;
n = strlen(s);
e = look("=", look("\n", nil));
if(e == nil)
e = look("\n", nil);
if(e == nil)
e = epos;
eatspace();
string("<h");
output("0123456"+n, 1);
string("><a name=\"");
o = pos;
s = trimback(e);
while(pos < s){
if((*pos >= 'a' && *pos <= 'z')
|| (*pos >= 'A' && *pos <= 'Z')
|| (*pos >= '0' && *pos <= '9')
|| (strchr("!#$%()_+,-./{|}~:;=?@[\\]^_`", *pos) != 0))
output(pos, 1);
else if(*pos == ' ' || *pos == '\t')
output("_", 1);
else if(*pos == '<')
string("<");
else if(*pos == '>')
string(">");
else if(*pos == '&')
string("&");
else if(*pos == '"')
string(""");
else if(*pos == '\'')
string("'");
pos++;
}
string("\"></a>");
pos = o;
ebody(e);
while(got("="))
;
string("</h");
output("0123456"+n, 1);
string(">");
return 1;
}
void
link(char *e)
{
char *s, *o;
s = o = pos;
while(s < epos){
if(e != nil && s >= e)
break;
if(*s == 0 || strchr("<>[] \t\r\n", *s) != nil)
break;
s++;
}
if(s-4 >= o)
if(cistrncmp(s-4, ".png", 4)
&& cistrncmp(s-4, ".jpg", 4)
&& cistrncmp(s-4, ".gif", 4)){
string("<a href=\"");
escape(s);
string("\">");
eatspace();
if(e != nil && pos < e)
ebody(e);
else {
pos = o;
escape(s);
}
string("</a>");
} else {
string("<img src=\"");
escape(s);
string("\">");
}
}
void
body(void)
{
char *s;
int t;
Next:
if(pos >= epos)
return;
if(got("\n") || got("\r\n"))
indent = -1;
if(got("\n") || got("\r\n")){
string("<br>");
while(got("\n") || got("\r\n"))
;
}
if(indent == -1){
indent = 0;
for(;;){
if(got(" "))
indent++;
else if(got("\t")){
indent += 8;
indent %= 8;
}
else break;
}
if(intable && look("||", look("\n", nil)) == nil){
string("</table>");
intable = 0;
}
string("\n");
if((indent < inlist) || (indent < inquote))
return;
while(indent > 0){
if(pos >= epos)
return;
if(got("*") || got("#")){
s = pos-1;
eatspace();
if(indent > inlist){
if(*s == '*')
string("<ul><li>");
else
string("<ol><li>");
t = inlist;
inlist = indent;
body();
inlist = t;
if(*s == '*')
string("</li></ul>");
else
string("</li></ol>");
} else {
string("</li><li>");
break;
}
} else if(indent > inquote){
string("<blockquote>");
t = inquote;
inquote = indent;
body();
inquote = t;
string("</blockquote>");
} else
break;
}
if(indent == 0){
if(got("#")){
if((pos = look("\n", nil)) == nil)
pos = epos;
goto Next;
}
if(heading())
goto Next;
if(got("----")){
while(got("-"))
;
string("<hr>");
goto Next;
}
}
}
if(got("`")){
if(s = look("`", nil)){
escape(s);
pos = s+1;
} else
string("`");
}
else if(got("<")){
string("<");
if(s = look(">", nil)){
s++;
output(pos, s - pos);
pos = s;
}
}
else if(got("[")){
if(s = look("]", nil)){
link(s);
pos = s+1;
} else
string("[");
}
else if(tag("*", "b") ||
tag("_", "i") ||
tag("^", "sup") ||
tag(",,", "sub") ||
tag("~~", "strike")){
}
else if(got("{{{")){
if(s = look("}}}", nil)){
if(look("\n", s)){
string("<pre>");
escape(s);
string("</pre>");
} else {
string("<tt>");
escape(s);
string("</tt>");
}
pos = s+3;
} else
string("{{{");
}
else if(got("||")){
if(s = look("||", look("\n", nil))){
eatspace();
switch(intable){
case 0: string("<table>");
intable++;
case 1: string("<tr>");
intable++;
}
string("<td>");
ebody(s);
string("</td>");
} else if(intable){
string("</tr>");
intable = 1;
}
}
else if(match("http://"))
link(nil);
else if(match("https://"))
link(nil);
else if(match("ftp://"))
link(nil);
else{
output(pos, 1);
pos++;
}
goto Next;
}
void
usage(void)
{
fprint(2, "usage: %s [ file ]\n", argv0);
exits("usage");
}
void
main(int argc, char *argv[])
{
int n;
ARGBEGIN{
default:
usage();
}ARGEND;
if(argc != 0 && argc != 1)
usage();
if(*argv){
if((n = open(*argv, OREAD)) < 0)
sysfatal("open %s: %r", *argv);
if(dup(n, 0) < 0)
sysfatal("dup: %r");
}
buf = opos = sbrk(HUNK);
pos = epos = buf + HUNK;
for(;;){
if(brk(epos + HUNK + 8) < 0)
sysfatal("brk: %r");
if((n = read(0, epos, HUNK)) < 0)
sysfatal("read: %r");
if(n == 0)
break;
epos += n;
}
if(epos > pos && epos[-1] != '\n')
*epos++ = '\n';
body();
flush();
exits(0);
}