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* More operators / primops.

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This commit is contained in:
Eelco Dolstra 2010-03-30 18:05:54 +00:00
parent c9170be2bd
commit 47df476daa
5 changed files with 145 additions and 187 deletions
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55
src/libexpr/primops.cc
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@ -687,24 +687,32 @@ static void prim_attrNames(EvalState & state, Value * * args, Value & v)
return makeList(list);
}
#endif
/* Dynamic version of the `.' operator. */
static void prim_getAttr(EvalState & state, Value * * args, Value & v)
{
string attr = evalStringNoCtx(state, args[0]);
return evalExpr(state, makeSelect(args[1], toATerm(attr)));
string attr = state.forceStringNoCtx(*args[0]);
state.forceAttrs(*args[1]);
Bindings::iterator i = args[1]->attrs->find(toATerm(attr));
if (i == args[1]->attrs->end())
throw EvalError(format("attribute `%1%' missing") % attr);
state.forceValue(i->second);
v = i->second;
}
/* Dynamic version of the `?' operator. */
static void prim_hasAttr(EvalState & state, Value * * args, Value & v)
{
string attr = evalStringNoCtx(state, args[0]);
return evalExpr(state, makeOpHasAttr(args[1], toATerm(attr)));
string attr = state.forceStringNoCtx(*args[0]);
state.forceAttrs(*args[1]);
mkBool(v, args[1]->attrs->find(toATerm(attr)) != args[1]->attrs->end());
}
#if 0
/* Builds an attribute set from a list specifying (name, value)
pairs. To be precise, a list [{name = "name1"; value = value1;}
... {name = "nameN"; value = valueN;}] is transformed to {name1 =
@ -896,31 +904,24 @@ static void prim_add(EvalState & state, Value * * args, Value & v)
}
#if 0
static void prim_sub(EvalState & state, Value * * args, Value & v)
{
int i1 = evalInt(state, args[0]);
int i2 = evalInt(state, args[1]);
return makeInt(i1 - i2);
mkInt(v, state.forceInt(*args[0]) - state.forceInt(*args[1]));
}
static void prim_mul(EvalState & state, Value * * args, Value & v)
{
int i1 = evalInt(state, args[0]);
int i2 = evalInt(state, args[1]);
return makeInt(i1 * i2);
mkInt(v, state.forceInt(*args[0]) * state.forceInt(*args[1]));
}
static void prim_div(EvalState & state, Value * * args, Value & v)
{
int i1 = evalInt(state, args[0]);
int i2 = evalInt(state, args[1]);
int i2 = state.forceInt(*args[1]);
if (i2 == 0) throw EvalError("division by zero");
return makeInt(i1 / i2);
mkInt(v, state.forceInt(*args[0]) / i2);
}
#endif
static void prim_lessThan(EvalState & state, Value * * args, Value & v)
@ -941,36 +942,36 @@ static void prim_toString(EvalState & state, Value * * args, Value & v)
{
PathSet context;
string s = state.coerceToString(*args[0], context, true, false);
mkString(v, strdup(s.c_str())); // !!! context
mkString(v, s.c_str()); // !!! context
}
#if 0
/* `substring start len str' returns the substring of `str' starting
at character position `min(start, stringLength str)' inclusive and
ending at `min(start + len, stringLength str)'. `start' must be
non-negative. */
static void prim_substring(EvalState & state, Value * * args, Value & v)
{
int start = evalInt(state, args[0]);
int len = evalInt(state, args[1]);
int start = state.forceInt(*args[0]);
int len = state.forceInt(*args[1]);
PathSet context;
string s = coerceToString(state, args[2], context);
string s = state.coerceToString(*args[2], context);
if (start < 0) throw EvalError("negative start position in `substring'");
return makeStr(string(s, start, len), context);
mkString(v, string(s, start, len), context);
}
static void prim_stringLength(EvalState & state, Value * * args, Value & v)
{
PathSet context;
string s = coerceToString(state, args[0], context);
return makeInt(s.size());
string s = state.coerceToString(*args[0], context);
mkInt(v, s.size());
}
#if 0
static void prim_unsafeDiscardStringContext(EvalState & state, Value * * args, Value & v)
{
PathSet context;
@ -1078,7 +1079,7 @@ void EvalState::createBaseEnv()
mkInt(v, time(0));
addConstant("__currentTime", v);
mkString(v, strdup(thisSystem.c_str()));
mkString(v, thisSystem.c_str());
addConstant("__currentSystem", v);
// Miscellaneous
@ -1120,8 +1121,10 @@ void EvalState::createBaseEnv()
// Attribute sets
addPrimOp("__attrNames", 1, prim_attrNames);
#endif
addPrimOp("__getAttr", 2, prim_getAttr);
addPrimOp("__hasAttr", 2, prim_hasAttr);
#if 0
addPrimOp("__isAttrs", 1, prim_isAttrs);
addPrimOp("removeAttrs", 2, prim_removeAttrs);
addPrimOp("__listToAttrs", 1, prim_listToAttrs);
@ -1140,18 +1143,16 @@ void EvalState::createBaseEnv()
// Integer arithmetic
addPrimOp("__add", 2, prim_add);
#if 0
addPrimOp("__sub", 2, prim_sub);
addPrimOp("__mul", 2, prim_mul);
addPrimOp("__div", 2, prim_div);
#endif
addPrimOp("__lessThan", 2, prim_lessThan);
// String manipulation
addPrimOp("toString", 1, prim_toString);
#if 0
addPrimOp("__substring", 3, prim_substring);
addPrimOp("__stringLength", 1, prim_stringLength);
#if 0
addPrimOp("__unsafeDiscardStringContext", 1, prim_unsafeDiscardStringContext);
addPrimOp("__unsafeDiscardOutputDependency", 1, prim_unsafeDiscardOutputDependency);