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* Export the nix-env derivation name parsing and version comparison

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logic through the `parseDrvName' and `compareVersions' primops.
  This will allow expressions to easily check whether some dependency
  is a specific needed version or falls in some version range.  See
  tests/lang/eval-okay-versions.nix for examples.
This commit is contained in:
Eelco Dolstra 2008-07-01 10:10:32 +00:00
parent b3b0b2a29e
commit d567baabbd
9 changed files with 103 additions and 37 deletions
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63
src/libexpr/primops.cc
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@ -7,6 +7,7 @@
#include "expr-to-xml.hh"
#include "nixexpr-ast.hh"
#include "parser.hh"
#include "names.hh"
#include <sys/types.h>
#include <sys/stat.h>
@ -817,7 +818,7 @@ static Expr prim_removeAttrs(EvalState & state, const ATermVector & args)
}
/* Determine whether the argument is a list. */
/* Determine whether the argument is an attribute set. */
static Expr prim_isAttrs(EvalState & state, const ATermVector & args)
{
ATermList list;
@ -950,23 +951,54 @@ static Expr prim_unsafeDiscardStringContext(EvalState & state, const ATermVector
return makeStr(s, PathSet());
}
/* Expression serialization/deserialization */
static Expr prim_ExprToString ( EvalState & state, const ATermVector & args)
/* Expression serialization/deserialization */
static Expr prim_exprToString(EvalState & state, const ATermVector & args)
{
return makeStr ( atPrint ( evalExpr ( state, args [ 0 ] ) ) );
/* !!! this disregards context */
return makeStr(atPrint(evalExpr(state, args[0])));
}
static Expr prim_StringToExpr ( EvalState & state, const ATermVector & args)
static Expr prim_stringToExpr(EvalState & state, const ATermVector & args)
{
string s;
PathSet l;
if (! matchStr ( evalExpr ( state, args[0] ), s, l )) {
throw EvalError("__stringToExpr needs string argument!");
}
return ATreadFromString(s.c_str());
/* !!! this can introduce arbitrary garbage terms in the
evaluator! */;
string s;
PathSet l;
if (!matchStr(evalExpr(state, args[0]), s, l))
throw EvalError("stringToExpr needs string argument!");
return ATreadFromString(s.c_str());
}
/*************************************************************
* Versions
*************************************************************/
static Expr prim_parseDrvName(EvalState & state, const ATermVector & args)
{
string name = evalStringNoCtx(state, args[0]);
DrvName parsed(name);
ATermMap attrs(2);
attrs.set(toATerm("name"), makeAttrRHS(makeStr(parsed.name), makeNoPos()));
attrs.set(toATerm("version"), makeAttrRHS(makeStr(parsed.version), makeNoPos()));
return makeAttrs(attrs);
}
static Expr prim_compareVersions(EvalState & state, const ATermVector & args)
{
string version1 = evalStringNoCtx(state, args[0]);
string version2 = evalStringNoCtx(state, args[1]);
int d = compareVersions(version1, version2);
return makeInt(d);
}
/*************************************************************
* Primop registration
*************************************************************/
@ -994,8 +1026,8 @@ void EvalState::addPrimOps()
addPrimOp("__trace", 2, prim_trace);
// Expr <-> String
addPrimOp("__exprToString", 1, prim_ExprToString);
addPrimOp("__stringToExpr", 1, prim_StringToExpr);
addPrimOp("__exprToString", 1, prim_exprToString);
addPrimOp("__stringToExpr", 1, prim_stringToExpr);
addPrimOp("relativise", 2, prim_relativise);
@ -1039,7 +1071,10 @@ void EvalState::addPrimOps()
addPrimOp("__substring", 3, prim_substring);
addPrimOp("__stringLength", 1, prim_stringLength);
addPrimOp("__unsafeDiscardStringContext", 1, prim_unsafeDiscardStringContext);
// Versions
addPrimOp("__parseDrvName", 1, prim_parseDrvName);
addPrimOp("__compareVersions", 2, prim_compareVersions);
}