forked from lix-project/lix
361 lines
7.5 KiB
C++
361 lines
7.5 KiB
C++
#include "nixexpr.hh"
|
|
#include "derivations.hh"
|
|
#include "util.hh"
|
|
|
|
#include <cstdlib>
|
|
|
|
|
|
namespace nix {
|
|
|
|
|
|
/* Displaying abstract syntax trees. */
|
|
|
|
std::ostream & operator << (std::ostream & str, Expr & e)
|
|
{
|
|
e.show(str);
|
|
return str;
|
|
}
|
|
|
|
void Expr::show(std::ostream & str)
|
|
{
|
|
abort();
|
|
}
|
|
|
|
void ExprInt::show(std::ostream & str)
|
|
{
|
|
str << n;
|
|
}
|
|
|
|
void ExprString::show(std::ostream & str)
|
|
{
|
|
str << "\"" << s << "\""; // !!! escaping
|
|
}
|
|
|
|
void ExprPath::show(std::ostream & str)
|
|
{
|
|
str << s;
|
|
}
|
|
|
|
void ExprVar::show(std::ostream & str)
|
|
{
|
|
str << name;
|
|
}
|
|
|
|
void ExprSelect::show(std::ostream & str)
|
|
{
|
|
str << "(" << *e << ")." << showAttrPath(attrPath);
|
|
if (def) str << " or " << *def;
|
|
}
|
|
|
|
void ExprOpHasAttr::show(std::ostream & str)
|
|
{
|
|
str << "(" << *e << ") ? " << showAttrPath(attrPath);
|
|
}
|
|
|
|
void ExprAttrs::show(std::ostream & str)
|
|
{
|
|
if (recursive) str << "rec ";
|
|
str << "{ ";
|
|
foreach (AttrDefs::iterator, i, attrs)
|
|
if (i->second.inherited)
|
|
str << "inherit " << i->first << " " << "; ";
|
|
else
|
|
str << i->first << " = " << *i->second.e << "; ";
|
|
str << "}";
|
|
}
|
|
|
|
void ExprList::show(std::ostream & str)
|
|
{
|
|
str << "[ ";
|
|
foreach (vector<Expr *>::iterator, i, elems)
|
|
str << "(" << **i << ") ";
|
|
str << "]";
|
|
}
|
|
|
|
void ExprLambda::show(std::ostream & str)
|
|
{
|
|
str << "(";
|
|
if (matchAttrs) {
|
|
str << "{ ";
|
|
bool first = true;
|
|
foreach (Formals::Formals_::iterator, i, formals->formals) {
|
|
if (first) first = false; else str << ", ";
|
|
str << i->name;
|
|
if (i->def) str << " ? " << *i->def;
|
|
}
|
|
str << " }";
|
|
if (!arg.empty()) str << " @ ";
|
|
}
|
|
if (!arg.empty()) str << arg;
|
|
str << ": " << *body << ")";
|
|
}
|
|
|
|
void ExprLet::show(std::ostream & str)
|
|
{
|
|
str << "let ";
|
|
foreach (ExprAttrs::AttrDefs::iterator, i, attrs->attrs)
|
|
if (i->second.inherited)
|
|
str << "inherit " << i->first << "; ";
|
|
else
|
|
str << i->first << " = " << *i->second.e << "; ";
|
|
str << "in " << *body;
|
|
}
|
|
|
|
void ExprWith::show(std::ostream & str)
|
|
{
|
|
str << "with " << *attrs << "; " << *body;
|
|
}
|
|
|
|
void ExprIf::show(std::ostream & str)
|
|
{
|
|
str << "if " << *cond << " then " << *then << " else " << *else_;
|
|
}
|
|
|
|
void ExprAssert::show(std::ostream & str)
|
|
{
|
|
str << "assert " << *cond << "; " << *body;
|
|
}
|
|
|
|
void ExprOpNot::show(std::ostream & str)
|
|
{
|
|
str << "! " << *e;
|
|
}
|
|
|
|
void ExprConcatStrings::show(std::ostream & str)
|
|
{
|
|
bool first = true;
|
|
foreach (vector<Expr *>::iterator, i, *es) {
|
|
if (first) first = false; else str << " + ";
|
|
str << **i;
|
|
}
|
|
}
|
|
|
|
void ExprPos::show(std::ostream & str)
|
|
{
|
|
str << "__curPos";
|
|
}
|
|
|
|
|
|
std::ostream & operator << (std::ostream & str, const Pos & pos)
|
|
{
|
|
if (!pos.line)
|
|
str << "undefined position";
|
|
else
|
|
str << (format("`%1%:%2%:%3%'") % pos.file % pos.line % pos.column).str();
|
|
return str;
|
|
}
|
|
|
|
|
|
string showAttrPath(const AttrPath & attrPath)
|
|
{
|
|
string s;
|
|
foreach (AttrPath::const_iterator, i, attrPath) {
|
|
if (!s.empty()) s += '.';
|
|
s += *i;
|
|
}
|
|
return s;
|
|
}
|
|
|
|
|
|
Pos noPos;
|
|
|
|
|
|
/* Computing levels/displacements for variables. */
|
|
|
|
void Expr::bindVars(const StaticEnv & env)
|
|
{
|
|
abort();
|
|
}
|
|
|
|
void ExprInt::bindVars(const StaticEnv & env)
|
|
{
|
|
}
|
|
|
|
void ExprString::bindVars(const StaticEnv & env)
|
|
{
|
|
}
|
|
|
|
void ExprPath::bindVars(const StaticEnv & env)
|
|
{
|
|
}
|
|
|
|
void ExprVar::bindVars(const StaticEnv & env)
|
|
{
|
|
/* Check whether the variable appears in the environment. If so,
|
|
set its level and displacement. */
|
|
const StaticEnv * curEnv;
|
|
unsigned int level;
|
|
int withLevel = -1;
|
|
for (curEnv = &env, level = 0; curEnv; curEnv = curEnv->up, level++) {
|
|
if (curEnv->isWith) {
|
|
if (withLevel == -1) withLevel = level;
|
|
} else {
|
|
StaticEnv::Vars::const_iterator i = curEnv->vars.find(name);
|
|
if (i != curEnv->vars.end()) {
|
|
fromWith = false;
|
|
this->level = level;
|
|
displ = i->second;
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Otherwise, the variable must be obtained from the nearest
|
|
enclosing `with'. If there is no `with', then we can issue an
|
|
"undefined variable" error now. */
|
|
if (withLevel == -1) throw UndefinedVarError(format("undefined variable `%1%' at %2%") % name % pos);
|
|
|
|
fromWith = true;
|
|
this->level = withLevel;
|
|
}
|
|
|
|
void ExprSelect::bindVars(const StaticEnv & env)
|
|
{
|
|
e->bindVars(env);
|
|
if (def) def->bindVars(env);
|
|
}
|
|
|
|
void ExprOpHasAttr::bindVars(const StaticEnv & env)
|
|
{
|
|
e->bindVars(env);
|
|
}
|
|
|
|
void ExprAttrs::bindVars(const StaticEnv & env)
|
|
{
|
|
if (recursive) {
|
|
StaticEnv newEnv(false, &env);
|
|
|
|
unsigned int displ = 0;
|
|
foreach (AttrDefs::iterator, i, attrs)
|
|
newEnv.vars[i->first] = i->second.displ = displ++;
|
|
|
|
foreach (AttrDefs::iterator, i, attrs)
|
|
i->second.e->bindVars(i->second.inherited ? env : newEnv);
|
|
}
|
|
|
|
else
|
|
foreach (AttrDefs::iterator, i, attrs)
|
|
i->second.e->bindVars(env);
|
|
}
|
|
|
|
void ExprList::bindVars(const StaticEnv & env)
|
|
{
|
|
foreach (vector<Expr *>::iterator, i, elems)
|
|
(*i)->bindVars(env);
|
|
}
|
|
|
|
void ExprLambda::bindVars(const StaticEnv & env)
|
|
{
|
|
StaticEnv newEnv(false, &env);
|
|
|
|
unsigned int displ = 0;
|
|
|
|
if (!arg.empty()) newEnv.vars[arg] = displ++;
|
|
|
|
if (matchAttrs) {
|
|
foreach (Formals::Formals_::iterator, i, formals->formals)
|
|
newEnv.vars[i->name] = displ++;
|
|
|
|
foreach (Formals::Formals_::iterator, i, formals->formals)
|
|
if (i->def) i->def->bindVars(newEnv);
|
|
}
|
|
|
|
body->bindVars(newEnv);
|
|
}
|
|
|
|
void ExprLet::bindVars(const StaticEnv & env)
|
|
{
|
|
StaticEnv newEnv(false, &env);
|
|
|
|
unsigned int displ = 0;
|
|
foreach (ExprAttrs::AttrDefs::iterator, i, attrs->attrs)
|
|
newEnv.vars[i->first] = i->second.displ = displ++;
|
|
|
|
foreach (ExprAttrs::AttrDefs::iterator, i, attrs->attrs)
|
|
i->second.e->bindVars(i->second.inherited ? env : newEnv);
|
|
|
|
body->bindVars(newEnv);
|
|
}
|
|
|
|
void ExprWith::bindVars(const StaticEnv & env)
|
|
{
|
|
/* Does this `with' have an enclosing `with'? If so, record its
|
|
level so that `lookupVar' can look up variables in the previous
|
|
`with' if this one doesn't contain the desired attribute. */
|
|
const StaticEnv * curEnv;
|
|
unsigned int level;
|
|
prevWith = 0;
|
|
for (curEnv = &env, level = 1; curEnv; curEnv = curEnv->up, level++)
|
|
if (curEnv->isWith) {
|
|
prevWith = level;
|
|
break;
|
|
}
|
|
|
|
attrs->bindVars(env);
|
|
StaticEnv newEnv(true, &env);
|
|
body->bindVars(newEnv);
|
|
}
|
|
|
|
void ExprIf::bindVars(const StaticEnv & env)
|
|
{
|
|
cond->bindVars(env);
|
|
then->bindVars(env);
|
|
else_->bindVars(env);
|
|
}
|
|
|
|
void ExprAssert::bindVars(const StaticEnv & env)
|
|
{
|
|
cond->bindVars(env);
|
|
body->bindVars(env);
|
|
}
|
|
|
|
void ExprOpNot::bindVars(const StaticEnv & env)
|
|
{
|
|
e->bindVars(env);
|
|
}
|
|
|
|
void ExprConcatStrings::bindVars(const StaticEnv & env)
|
|
{
|
|
foreach (vector<Expr *>::iterator, i, *es)
|
|
(*i)->bindVars(env);
|
|
}
|
|
|
|
void ExprPos::bindVars(const StaticEnv & env)
|
|
{
|
|
}
|
|
|
|
|
|
/* Storing function names. */
|
|
|
|
void Expr::setName(Symbol & name)
|
|
{
|
|
}
|
|
|
|
|
|
void ExprLambda::setName(Symbol & name)
|
|
{
|
|
this->name = name;
|
|
body->setName(name);
|
|
}
|
|
|
|
|
|
string ExprLambda::showNamePos() const
|
|
{
|
|
return (format("%1% at %2%") % (name.set() ? "`" + (string) name + "'" : "an anonymous function") % pos).str();
|
|
}
|
|
|
|
|
|
|
|
/* Symbol table. */
|
|
|
|
size_t SymbolTable::totalSize() const
|
|
{
|
|
size_t n = 0;
|
|
foreach (Symbols::const_iterator, i, symbols)
|
|
n += i->size();
|
|
return n;
|
|
}
|
|
|
|
|
|
}
|