/*
** Copyright (c) 2008 D. Richard Hipp
**
** This program is free software; you can redistribute it and/or
** modify it under the terms of the GNU General Public
** License version 2 as published by the Free Software Foundation.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
** General Public License for more details.
**
** You should have received a copy of the GNU General Public
** License along with this library; if not, write to the
** Free Software Foundation, Inc., 59 Temple Place - Suite 330,
** Boston, MA 02111-1307, USA.
**
** Author contact information:
** drh@hwaci.com
** http://www.hwaci.com/drh/
**
*******************************************************************************
**
** This file contains an interface between the TH scripting language
** (an independent project) and fossil.
*/
#include "config.h"
#include "th_main.h"
/*
** Global variable counting the number of outstanding calls to malloc()
** made by the th1 implementation. This is used to catch memory leaks
** in the interpreter. Obviously, it also means th1 is not threadsafe.
*/
static int nOutstandingMalloc = 0;
/*
** A pointer to the single TH interpreter used within fossil.
*/
static Th_Interp *interp = 0;
/*
** Implementations of malloc() and free() to pass to the interpreter.
*/
static void *xMalloc(unsigned int n){
void *p = malloc(n);
if( p ){
nOutstandingMalloc++;
}
return p;
}
static void xFree(void *p){
if( p ){
nOutstandingMalloc--;
}
free(p);
}
static Th_Vtab vtab = { xMalloc, xFree };
/*
** True if output is enabled. False if disabled.
*/
static int enableOutput = 1;
/*
** TH command: enable_output BOOLEAN
**
** Enable or disable the puts and hputs commands.
*/
static int enableOutputCmd(
Th_Interp *interp,
void *p,
int argc,
const unsigned char **argv,
int *argl
){
if( argc!=2 ){
return Th_WrongNumArgs(interp, "enable_output BOOLEAN");
}
return Th_ToInt(interp, argv[1], argl[1], &enableOutput);
}
/*
** Send text to the appropriate output: Either to the console
** or to the CGI reply buffer.
*/
static void sendText(const char *z, int n){
if( enableOutput && n ){
if( n<0 ) n = strlen(z);
if( g.cgiPanic ){
cgi_append_content(z, n);
}else{
fwrite(z, 1, n, stdout);
}
}
}
/*
** TH command: puts STRING
** TH command: html STRING
**
** Output STRING as HTML (html) or unchanged (puts).
*/
static int putsCmd(
Th_Interp *interp,
void *pConvert,
int argc,
const unsigned char **argv,
int *argl
){
if( argc!=2 ){
return Th_WrongNumArgs(interp, "puts STRING");
}
if( enableOutput ){
int size;
char *zOut;
if( pConvert ){
zOut = htmlize((char*)argv[1], argl[1]);
size = strlen(zOut);
}else{
zOut = (char*)argv[1];
size = argl[1];
}
sendText(zOut, size);
if( pConvert ){
free(zOut);
}
}
return TH_OK;
}
/*
** TH command: wiki STRING
**
** Render the input string as wiki.
*/
static int wikiCmd(
Th_Interp *interp,
void *p,
int argc,
const unsigned char **argv,
int *argl
){
if( argc!=2 ){
return Th_WrongNumArgs(interp, "puts STRING");
}
if( enableOutput ){
Blob src;
blob_init(&src, (char*)argv[1], argl[1]);
wiki_convert(&src, 0, WIKI_INLINE);
blob_reset(&src);
}
return TH_OK;
}
/*
** Make sure the interpreter has been initialized.
*/
static void initializeInterp(void){
static struct _Command {
const char *zName;
Th_CommandProc xProc;
void *pContext;
} aCommand[] = {
{"enable_output", enableOutputCmd, 0},
{"html", putsCmd, 0},
{"puts", putsCmd, (void*)1},
{"wiki", wikiCmd, 0},
};
if( interp==0 ){
int i;
interp = Th_CreateInterp(&vtab);
th_register_language(interp); /* Basic scripting commands. */
for(i=0; i<sizeof(aCommand)/sizeof(aCommand[0]); i++){
Th_CreateCommand(interp, aCommand[i].zName, aCommand[i].xProc,
aCommand[i].pContext, 0);
}
}
}
/*
** Initialize a variable in the interpreter.
*/
void Th_InitVar(const char *zName, const char *zValue){
initializeInterp();
Th_SetVar(interp, zName, -1, zValue, strlen(zValue));
}
/*
** Return true if the string begins with the TH1 begin-script
** tag: <th1>.
*/
static int isBeginScriptTag(const char *z){
return z[0]=='<'
&& (z[1]=='t' || z[1]=='T')
&& (z[2]=='h' || z[2]=='H')
&& z[3]=='1'
&& z[4]=='>';
}
/*
** Return true if the string begins with the TH1 end-script
** tag: </th1>.
*/
static int isEndScriptTag(const char *z){
return z[0]=='<'
&& z[1]=='/'
&& (z[2]=='t' || z[2]=='T')
&& (z[3]=='h' || z[3]=='H')
&& z[4]=='1'
&& z[5]=='>';
}
/*
** If string z[0...] contains a valid variable name, return
** the number of characters in that name. Otherwise, return 0.
*/
static int validVarName(const char *z){
int i = 0;
if( z[0]==':' && z[1]==':' && isalpha(z[2]) ){
z += 3;
i = 3;
}else if( isalpha(z[0]) ){
z ++;
i = 1;
}else{
return 0;
}
while( isalnum(z[0]) || z[0]=='_' ){
z++;
i++;
}
return i;
}
/*
** The z[] input contains text mixed with TH1 scripts.
** The TH1 scripts are contained within <th1>...</th1>. This routine
** processes the template and writes the results on either
** stdout or into CGI.
*/
int Th_Render(const char *z){
int i = 0;
int n;
int rc = TH_OK;
uchar *zResult;
initializeInterp();
while( z[i] ){
if( z[i]=='$' && (n = validVarName(&z[i+1]))>0 ){
sendText(z, i);
rc = Th_GetVar(interp, &z[i+1], n);
z += i+1+n;
i = 0;
zResult = Th_GetResult(interp, &n);
sendText(zResult, n);
}else if( z[i]=='<' && isBeginScriptTag(&z[i]) ){
sendText(z, i);
z += i+5;
for(i=0; z[i] && (z[i]!='<' || !isEndScriptTag(&z[i])); i++){}
rc = Th_Eval(interp, 0, (const uchar*)z, i);
if( rc!=SBS_OK ) break;
z += i;
if( z[0] ){ z += 6; }
i = 0;
}else{
i++;
}
}
if( rc==TH_ERROR ){
sendText("<hr><p><font color=\"red\"><b>ERROR: ", -1);
zResult = Th_GetResult(interp, &n);
sendText(zResult, n);
sendText("</b></font></p>", -1);
}else{
sendText(z, i);
}
return rc;
}
/*
** COMMAND: test-th-render
*/
void test_th_render(void){
Blob in;
if( g.argc<3 ){
usage("FILE");
}
blob_zero(&in);
blob_read_from_file(&in, g.argv[2]);
Th_Render(blob_str(&in));
}