87 lines
2.3 KiB
C++
87 lines
2.3 KiB
C++
#include "get-drvs.hh"
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#include "nixexpr-ast.hh"
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bool getDerivation(EvalState & state, Expr e, DrvInfo & drv)
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{
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ATermList es;
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e = evalExpr(state, e);
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if (!matchAttrs(e, es)) return false;
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ATermMap attrs;
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queryAllAttrs(e, attrs, false);
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Expr a = attrs.get("type");
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if (!a || evalString(state, a) != "derivation") return false;
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a = attrs.get("name");
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if (!a) throw badTerm("derivation name missing", e);
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drv.name = evalString(state, a);
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a = attrs.get("system");
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if (!a)
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drv.system = "unknown";
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else
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drv.system = evalString(state, a);
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drv.attrs = attrs;
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return true;
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}
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void getDerivations(EvalState & state, Expr e, DrvInfos & drvs)
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{
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ATermList es;
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DrvInfo drv;
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e = evalExpr(state, e);
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if (getDerivation(state, e, drv)) {
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drvs.push_back(drv);
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return;
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}
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if (matchAttrs(e, es)) {
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ATermMap drvMap;
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queryAllAttrs(e, drvMap);
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for (ATermIterator i(drvMap.keys()); i; ++i) {
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debug(format("evaluating attribute `%1%'") % aterm2String(*i));
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if (getDerivation(state, drvMap.get(*i), drv))
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drvs.push_back(drv);
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else
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;
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// parseDerivations(state, drvMap.get(*i), drvs);
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}
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return;
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}
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if (matchList(e, es)) {
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for (ATermIterator i(es); i; ++i) {
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debug(format("evaluating list element"));
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if (getDerivation(state, *i, drv))
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drvs.push_back(drv);
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else
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getDerivations(state, *i, drvs);
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}
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return;
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}
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ATermList formals;
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ATerm body, pos;
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if (matchFunction(e, formals, body, pos)) {
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for (ATermIterator i(formals); i; ++i) {
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Expr name, def;
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if (matchNoDefFormal(*i, name))
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throw Error(format("expression evaluates to a function with no-default arguments (`%1%')")
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% aterm2String(name));
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else if (!matchDefFormal(*i, name, def))
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abort(); /* can't happen */
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}
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getDerivations(state, makeCall(e, makeAttrs(ATermMap())), drvs);
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return;
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}
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throw Error("expression does not evaluate to a derivation (or a set or list of those)");
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}
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