1 files changed, 97 insertions, 0 deletions
diff --git a/src/libexpr/attr-path.cc b/src/libexpr/attr-path.cc
new file mode 100644
index 000000000000..fdd61a5fd375
--- /dev/null
+++ b/src/libexpr/attr-path.cc
@@ -0,0 +1,97 @@
+#include "attr-path.hh"
+#include "eval-inline.hh"
+#include "util.hh"
+
+
+namespace nix {
+
+
+static Strings parseAttrPath(const string & s)
+{
+    Strings res;
+    string cur;
+    string::const_iterator i = s.begin();
+    while (i != s.end()) {
+        if (*i == '.') {
+            res.push_back(cur);
+            cur.clear();
+        } else if (*i == '"') {
+            ++i;
+            while (1) {
+                if (i == s.end())
+                    throw Error(format("missing closing quote in selection path ‘%1%’") % s);
+                if (*i == '"') break;
+                cur.push_back(*i++);
+            }
+        } else
+            cur.push_back(*i);
+        ++i;
+    }
+    if (!cur.empty()) res.push_back(cur);
+    return res;
+}
+
+
+Value * findAlongAttrPath(EvalState & state, const string & attrPath,
+    Bindings & autoArgs, Value & vIn)
+{
+    Strings tokens = parseAttrPath(attrPath);
+
+    Error attrError =
+        Error(format("attribute selection path ‘%1%’ does not match expression") % attrPath);
+
+    Value * v = &vIn;
+
+    foreach (Strings::iterator, i, tokens) {
+
+        /* Is *i an index (integer) or a normal attribute name? */
+        enum { apAttr, apIndex } apType = apAttr;
+        string attr = *i;
+        unsigned int attrIndex;
+        if (string2Int(attr, attrIndex)) apType = apIndex;
+
+        /* Evaluate the expression. */
+        Value * vNew = state.allocValue();
+        state.autoCallFunction(autoArgs, *v, *vNew);
+        v = vNew;
+        state.forceValue(*v);
+
+        /* It should evaluate to either a set or an expression,
+           according to what is specified in the attrPath. */
+
+        if (apType == apAttr) {
+
+            if (v->type != tAttrs)
+                throw TypeError(
+                    format("the expression selected by the selection path ‘%1%’ should be a set but is %2%")
+                    % attrPath % showType(*v));
+
+            if (attr.empty())
+                throw Error(format("empty attribute name in selection path ‘%1%’") % attrPath);
+
+            Bindings::iterator a = v->attrs->find(state.symbols.create(attr));
+            if (a == v->attrs->end())
+                throw Error(format("attribute ‘%1%’ in selection path ‘%2%’ not found") % attr % attrPath);
+            v = &*a->value;
+        }
+
+        else if (apType == apIndex) {
+
+            if (v->type != tList)
+                throw TypeError(
+                    format("the expression selected by the selection path ‘%1%’ should be a list but is %2%")
+                    % attrPath % showType(*v));
+
+            if (attrIndex >= v->list.length)
+                throw Error(format("list index %1% in selection path ‘%2%’ is out of range") % attrIndex % attrPath);
+
+            v = v->list.elems[attrIndex];
+        }
+
+    }
+
+    return v;
+}
+
+
+}