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/*
* $Id: function.c,v 1.3 2004/12/29 22:22:16 lordjaxom Exp $
*/
#include "xml/function.h"
#include "render.h"
#include "bitmap.h"
#include "common.h"
#include <vdr/plugin.h>
#include <vdr/tools.h>
static const char *Internals[] = {
"not", "and", "or", "equal", "file", "trans", "plugin", NULL
};
const std::string cxFunction::False = "";
const std::string cxFunction::True = "1";
cxFunction::cxFunction(void):
mType(string),
mString(),
mNumber(0),
mNumParams(0)
{
}
cxFunction::cxFunction(const cxString &String):
mType(string),
mString(String),
mNumber(0),
mNumParams(0)
{
}
cxFunction::cxFunction(const cxFunction &Src):
mType(Src.mType),
mString(Src.mString),
mNumber(Src.mNumber),
mNumParams(Src.mNumParams)
{
for (uint i = 0; i < mNumParams; ++i)
mParams[i] = new cxFunction(*Src.mParams[i]);
}
cxFunction::~cxFunction()
{
for (uint i = 0; i < mNumParams; ++i)
delete mParams[i];
}
bool cxFunction::Parse(const std::string &Text)
{
const char *text = Text.c_str();
const char *ptr = text, *last = text;
eType type = undefined_function;
int inExpr = 0;
cxFunction *expr;
if (*ptr == '\'' || *ptr == '{') {
// must be string
if (strlen(ptr) < 2
|| (*ptr == '\'' && *(ptr + strlen(ptr) - 1) != '\'')
|| (*ptr == '{' && *(ptr + strlen(ptr) - 1) != '}')) {
esyslog("ERROR: Unmatched string end\n");
return false;
}
std::string temp;
if (*ptr == '\'')
temp.assign(ptr + 1, strlen(ptr) - 2);
else
temp.assign(ptr);
int pos = -1;
while ((pos = temp.find("\\'", pos + 1)) != -1)
temp.replace(pos, 2, "'");
if (!mString.Parse(temp))
return false;
mType = string;
}
else {
// expression
for (; *ptr; ++ptr) {
if (*ptr == '(') {
if (inExpr++ == 0) {
int i;
for (i = 0; Internals[i] != NULL; ++i) {
if ((size_t)(ptr - last) == strlen(Internals[i])
&& memcmp(last, Internals[i], ptr - last) == 0){
type = (eType)(INTERNAL + 1 + i);
break;
}
}
if (Internals[i] == NULL) {
esyslog("ERROR: Unknown function %.*s", (int)(ptr - last), last);
return false;
}
last = ptr + 1;
}
}
else if (*ptr == ',' || *ptr == ')') {
if (inExpr == 0) {
esyslog("ERROR: Unmatched '%c' in expression", *ptr);
return false;
}
if (inExpr == 1) {
expr = new cxFunction;
if (!expr->Parse(std::string(last, ptr - last))) {
delete expr;
return false;
}
mType = type;
mParams[mNumParams++] = expr;
last = ptr + 1;
}
if (*ptr == ')') {
if (inExpr == 1) {
int params = 0;
switch (mType) {
case fun_and:
case fun_or: params = -1; break;
case fun_eq: ++params;
case fun_not:
case fun_trans:
case fun_plugin:
case fun_file: ++params;
default: break;
}
if (params != -1 && mNumParams != (uint)params) {
esyslog("ERROR: Text2Skin: Wrong number of parameters to %s, "
"expecting %d", Internals[mType - 1 - INTERNAL], params);
return false;
}
}
--inExpr;
}
}
}
if (inExpr > 0) {
esyslog("ERROR: Expecting ')' in expression");
return false;
}
}
return true;
}
const std::string &cxFunction::FunFile(const std::string &Param) const
{
std::string path = cText2SkinRender::ImagePath(Param);
Dprintf("checking file(%s) in cache\n", path.c_str());
return cText2SkinBitmap::Available(path) ? Param : False;
}
std::string cxFunction::FunPlugin(const std::string &Param) const
{
cPlugin *p = cPluginManager::GetPlugin(Param.c_str());
if (p) {
const char *entry = p->MainMenuEntry();
if (entry)
return entry;
}
return False;
}
std::string cxFunction::Evaluate(void) const
{
switch (mType) {
case string:
return mString.Evaluate();
case fun_not:
return mParams[0]->EvaluateToBool() ? False : True;
case fun_and:
for (uint i = 0; i < mNumParams; ++i) {
if (!mParams[i]->EvaluateToBool())
return False;
}
return True;
case fun_or:
for (uint i = 0; i < mNumParams; ++i) {
if (mParams[i]->EvaluateToBool())
return True;
}
return False;
case fun_eq:
return mParams[0]->Evaluate() == mParams[1]->Evaluate() ? True : False;
case fun_file:
return FunFile(mParams[0]->Evaluate());
case fun_trans:
Dprintf("|%s| translates to |%s|\n", mParams[0]->Evaluate().c_str(), tr(mParams[0]->Evaluate().c_str()));
return tr(mParams[0]->Evaluate().c_str());
case fun_plugin:
return FunPlugin(mParams[0]->Evaluate());
default:
Dprintf("unknown function code\n");
esyslog("ERROR: Unknown function code called (this shouldn't happen)");
break;
}
return False;
}
bool cxFunction::EvaluateToBool(void)
{
std::string result = Evaluate();
if (result == False/* || result == "0"*/)
return false;
return true;
}
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