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/*************************************************************************
*
* HTCd - Copyright (C) 1998-2006 Henrik Rydberg
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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 program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <lang/env.h>
#include <mt/dates.h>
using namespace std;
TOK_IMPL(branch) {
int index=atoi(env[0]);
if(index<0) index+=env.args;
if(index>0&&index<env.args) env.parg(out,index);
else if(index<0||index>=env.args) THROW("htc: bad branching index "<<index);
}
TOK_IMPL(if) {
if(atob(env[0])) env.parg(out,1); else env.parg(out,2);
}
TOK_IMPL(nif) {
if(!atob(env[0])) env.parg(out,1); else env.parg(out,2);
}
TOK_IMPL(switch) {
sref s=env[0];
int i;
for(i=1;i+1<env.args;i+=2) if(env.parg(i)==s) { env.parg(out,i+1); return; }
if(i<env.args) env.parg(out,i);
}
/////////////////////////////////////////////////////////////////////
static int eval(Env& env,expr_t* x,int mod) {
mswrite out;
if(x->status&OP_PARSE) env.parse(out,x->expr); else x->eval(out,env,mod);
return atob(out.str());
}
TOK_IMPL(for) {
expr_t* x[4]={env.arg(0),env.arg(1),env.arg(2),env.arg(3)};
Env nenv(env);
for(eval(nenv,x[0],OP_ALL);
env.req->is_running()&&eval(nenv,x[1],OP_LOCAL);
eval(nenv,x[2],OP_LOCAL))
nenv.parse(out,x[3]);
}
TOK_IMPL(while) {
expr_t* x[2]={env.arg(0),env.arg(1)};
Env nenv(env);
while(env.req->is_running()&&eval(nenv,x[0],OP_ALL)) nenv.parse(out,x[1]);
}
/////////////////////////////////////////////////////////////////////
TOK_IMPL(forall) {
mstring sep; env.parg(sep,-1);
sref s=env[0];
sref p,e=env[1];
expr_t* x=env.arg(2);
Env nenv(env);
if(sep.nempty()) {
charset seps(sep.c_str());
while(Split(p,e,seps)) {
nenv.aloc(s,p);
nenv.parse(out,x);
}
}
else {
while(Split(p,e)) {
nenv.aloc(s,p);
nenv.parse(out,x);
}
}
}
/////////////////////////////////////////////////////////////////////
TOK_IMPL(on_arg) {
if(env.up&&env.up->onarg(atoi(env[0])-1)) env.parg(out,1); else env.parg(out,2);
}
TOK_IMPL(on_glob) { if(env.onglob(env[0])) env.parg(out,1); else env.parg(out,2); }
TOK_IMPL(on_loc) { if(env.onloc(env[0])) env.parg(out,1); else env.parg(out,2); }
/////////////////////////////////////////////////////////////////////
TOK_IMPL(setlang) {
env.req->lang=Language(env[0]); if(env.req->lang<0) env.req->lang=0;
}
TOK_IMPL(lang) {
env.parg(out,env.req->lang);
}
/////////////////////////////////////////////////////////////////////
void envAddFlow(tokmap& T)
{
TOK_ADD(branch,"x*",tok_t::PUBLIC,
"%Multiple branch\n"
"%Syntax: \\branch{x}<body>..<body>\n"
"%\n"
"%x==0 means nothing is executed, the first body for x==1, etc\n"
"%Negative values wrap to end\n"
);
TOK_ADD(if,"xr?",tok_t::PUBLIC,
"%if - logical branch\n"
"%Syntax: \\if{x}{body}<else>\n"
"%\n"
"%if x is non-zero, evaluates body, otherwise else if exist\n"
);
TOK_ADD(nif,"xr?",tok_t::PUBLIC,
"%nif - logical branch\n"
"%Syntax: \\nif{x}{body}<else>\n"
"%\n"
"%if x is zero, evaluates body, otherwise else if exist\n"
);
TOK_ADD(switch,"x*",tok_t::PUBLIC,
"%Multiple switch\n"
"%Syntax: \\switch{x}<val><body>..<val><body>..<default>\n"
"%\n"
"%A sequence of pairs <val><body> follows x\n"
"%x==val means body is executed\n"
"%\n"
"%An unpaired body at the end is treated as default\n"
);
/////////////////////////////////////////////////////////////////////
TOK_ADD(for,"rrrr",tok_t::PRIVATE,
"%C style\n"
"%Syntax: \\for{start}{test}{next}{body}\n"
"%\n"
"%Note that test and next are evaluated with optimization: only\n"
"%local variables are updated. Hence, you cannot use a function\n"
"%as the whole test, only as a part of the test, as in i<\\function.\n"
);
TOK_ADD(while,"rr",tok_t::PRIVATE,
"%C style\n"
"%Syntax: \\while{test}{body}\n"
"%\n"
"%There is no optimization on test - globals are re-evaluated in each step\n"
);
TOK_ADD(forall,"xx?r",tok_t::PUBLIC,
"%Loop through elements\n"
"%Syntax: \\forall{varname}{list}<additional whitespace>{body}\n"
"%\n"
"%Default whitespace are ( \\t\\r\\n). Optional whitespace characters\n"
"%may be given. This enables the design of special lists.\n"
);
/////////////////////////////////////////////////////////////////////
TOK_ADD(on_arg,"xr?",tok_t::PUBLIC,
"%Do if arg exist and is non-empty\n"
"%Syntax: \\on.arg{number}{body}<else>\n"
);
TOK_ADD(on_glob,"xr?",tok_t::PUBLIC,
"%Do if global variable exist and is non-empty\n"
"%Syntax: \\on.glob{varname}{body}<else>\n"
);
TOK_ADD(on_loc,"xr?",tok_t::PUBLIC,
"%Do if local variable exist and is non-empty\n"
"%Syntax: \\on.loc{varname}{body}<else>\n"
);
/////////////////////////////////////////////////////////////////////
TOK_ADD(lang,"r*",tok_t::PUBLIC,
"%Branch on global language\n"
"%Syntax: \\lang{en}{sv}..\n"
"%\n"
"%Currently English (en) and Swedish (sv) are supported\n"
);
TOK_ADD(setlang,"x",tok_t::PUBLIC,
"%Set global language\n"
"%Syntax: \\setlang{language code list}\n"
"%\n"
"%The language actually set is a negotitation -\n"
"%the first code in the list recognized is set.\n"
"%If not found, the default language English (en) is set.\n"
);
}
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