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/*****
* genv.cc
* Andy Hammerlindl 2002/08/29
*
* This is the global environment for the translation of programs. In
* actuality, it is basically a module manager. When a module is
* requested, it looks for the corresponding filename, and if found,
* parses and translates the file, returning the resultant module.
*
* genv sets up the basic type bindings and function bindings for
* builtin functions, casts and operators, and imports plain (if set),
* but all other initialization is done by the local environment defined
* in env.h.
*****/
#include <sstream>
#include <unistd.h>
#include <algorithm>
#include "genv.h"
#include "env.h"
#include "dec.h"
#include "stm.h"
#include "types.h"
#include "settings.h"
#include "runtime.h"
#include "parser.h"
#include "locate.h"
#include "interact.h"
#include "builtin.h"
using namespace types;
using settings::getSetting;
using settings::Setting;
// Dynamic loading of external libraries.
types::record *transExternalModule(trans::genv& ge, string filename, symbol id);
namespace trans {
genv::genv()
: imap()
{
// Add settings as a module. This is so that the init file ~/.asy/config.asy
// can set settings.
imap["settings"]=settings::getSettingsModule();
// Translate plain in advance, if we're using autoplain.
if(getSetting<bool>("autoplain")) {
Setting("autoplain")=false;
// Translate plain without autoplain.
getModule(symbol::trans("plain"), "plain");
Setting("autoplain")=true;
}
#ifdef HAVE_LIBGSL
imap["gsl"]=trans::getGSLModule();
#endif
}
bool endswith(string suffix, string str)
{
return std::equal(suffix.rbegin(), suffix.rend(), str.rbegin());
}
record *genv::loadModule(symbol id, string filename) {
// Hackish way to load an external library.
#if 0
if (endswith(".so", filename)) {
return transExternalModule(*this, filename, id);
}
#endif
// Get the abstract syntax tree.
absyntax::file *ast = parser::parseFile(filename,"Loading");
inTranslation.push_front(filename);
em.sync();
record *r=ast->transAsFile(*this, id);
inTranslation.remove(filename);
return r;
}
void genv::checkRecursion(string filename) {
if (find(inTranslation.begin(), inTranslation.end(), filename) !=
inTranslation.end()) {
em.sync();
em << "error: recursive loading of module '" << filename << "'\n";
em.sync();
throw handled_error();
}
}
record *genv::getModule(symbol id, string filename) {
checkRecursion(filename);
record *r=imap[filename];
if (r)
return r;
else {
record *r=loadModule(id, filename);
// Don't add an erroneous module to the dictionary in interactive mode, as
// the user may try to load it again.
if (!interact::interactive || !em.errors())
imap[filename]=r;
return r;
}
}
typedef vm::stack::importInitMap importInitMap;
importInitMap *genv::getInitMap()
{
struct initMap : public importInitMap, public gc {
genv ≥
initMap(genv &ge)
: ge(ge) {}
lambda *operator[](string s) {
record *r=ge.imap[s];
return r ? r->getInit() : 0;
}
};
return new initMap(*this);
}
} // namespace trans
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