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#include "expr.h"
#include "interpreter.h"
#include <geogram/basic/string.h>
extern "C" {
#include <lauxlib.h>
#include <lualib.h>
}
namespace GEO {
namespace String {
std::string to_string(Expr* e) {
return e->atomic() ? e->to_string() : "(" + e->to_string() + ")";
}
}
/**************************************************************************/
Expr::~Expr() { }
std::string Expr::name() const {
std::string result;
// Try to find this variable in Lua's global scope,
// if found, use its name.
lua_State* L = Interpreter::instance()->lua_state();
lua_pushglobaltable(L);
int index = lua_gettop(L);
lua_pushnil(L);
while(lua_next(L,index) != 0) {
if(lua_isexpr(L,-1) && lua_toexpr(L,-1) == this) {
result = std::string(lua_tostring(L,-2));
}
lua_pop(L,1);
}
// If not found in Lua's global scope, generate a unique ID
// from this Expr's address.
if(result.length() == 0) {
result = "expr@" + String::to_string(this);
}
return result;
}
/**************************************************************************/
Expr::Type Constant::type() const {
return SCALAR;
}
index_t Constant::dim() const {
return 1;
}
std::string Constant::to_string() const {
return String::to_string(value());
}
bool Constant::atomic() const {
return true;
}
/**************************************************************************/
Expr::Type Variable::type() const {
return type_;
}
bool Variable::atomic() const {
return true;
}
/**************************************************************************/
index_t ScalarVar::dim() const {
return 1;
}
std::string ScalarVar::to_string() const {
// return name() + ":scalar";
return name();
}
/**************************************************************************/
index_t VectorVar::default_dim_ = 3;
index_t VectorVar::dim() const {
return dim_ == index_t(-1) ? default_dim_ : dim_;
}
std::string VectorVar::to_string() const {
std::string result = name();
/*
result += ":vec";
if(dim_ != index_t(-1)) {
result += ("[" + String::to_string(dim_) + "]");
}
*/
return result;
}
/**************************************************************************/
std::string VectorComponent::to_string() const {
return String::to_string(vector()) + "[" + String::to_string(component_) + "]";
}
bool VectorComponent::atomic() const {
return true;
}
Expr::Type VectorComponent::type() const {
return SCALAR;
}
index_t VectorComponent::dim() const {
return 1;
}
/**************************************************************************/
index_t SignVar::dim() const {
return 0;
}
std::string SignVar::to_string() const {
return name() + ":sign";
}
/**************************************************************************/
Expr::Type Sum::type() const {
return type_;
}
index_t Sum::dim() const {
return dim_;
}
std::string Sum::to_string() const {
std::string result;
for(index_t i=0; i<nb_terms(); ++i) {
result += String::to_string(ith_term(i));
if(i != nb_terms()-1) {
result += " + ";
}
}
return result;
}
void Sum::add_term(Expr* term) {
{
Sum* sum = dynamic_cast<Sum*>(term);
if(sum != nullptr) {
for(index_t i=0; i<sum->nb_terms(); ++i) {
add_term(sum->ith_term(i));
}
return;
}
}
{
Constant* co1 = dynamic_cast<Constant*>(term);
if(co1 != nullptr) {
if(co1->value() == 0.0) {
return;
}
for(index_t i=0; i<nb_terms(); ++i) {
Constant* co2 = dynamic_cast<Constant*>(ith_term(i));
if(co2 != nullptr) {
terms_[i] = new Constant(co1->value() + co2->value());
return;
}
}
}
}
terms_.push_back(term);
}
bool Sum::atomic() const {
return false;
}
/**************************************************************************/
Expr::Type Product::type() const {
return type_;
}
index_t Product::dim() const {
return dim_;
}
std::string Product::to_string() const {
std::string result;
for(index_t i=0; i<nb_factors(); ++i) {
result += String::to_string(ith_factor(i));
if(i != nb_factors()-1) {
result += " * ";
}
}
return result;
}
void Product::mult_factor(Expr* factor) {
{
for(index_t i=0; i<nb_factors(); ++i) {
if(factor == ith_factor(i)) {
factors_[i] = new Pow(factor,2);
return;
}
Pow* pow = dynamic_cast<Pow*>(ith_factor(i));
if(pow != nullptr && pow->arg() == factor) {
factors_[i] = new Pow(factor,pow->exponent()+1);
return;
}
}
}
{
Product* prod = dynamic_cast<Product*>(factor);
if(prod != nullptr) {
for(index_t i=0; i<prod->nb_factors(); ++i) {
mult_factor(prod->ith_factor(i));
}
return;
}
}
{
Constant* co1 = dynamic_cast<Constant*>(factor);
if(co1 != nullptr) {
if(co1->value() == 1.0) {
return;
}
for(index_t i=0; i<nb_factors(); ++i) {
Constant* co2 = dynamic_cast<Constant*>(ith_factor(i));
if(co2 != nullptr) {
factors_[i] = new Constant(co1->value() * co2->value());
return;
}
}
}
}
factors_.push_back(factor);
}
bool Product::atomic() const {
return false;
}
/**************************************************************************/
Expr::Type Pow::type() const {
return type_;
}
index_t Pow::dim() const {
return dim_;
}
std::string Pow::to_string() const {
return String::to_string(arg()) + "^" + String::to_string(exponent());
}
bool Pow::atomic() const {
return false;
}
/**************************************************************************/
}
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