1 files changed, 149 insertions, 0 deletions
diff --git a/src/libexpr/value-to-xml.cc b/src/libexpr/value-to-xml.cc
new file mode 100644
index 000000000000..eff414aba3b5
--- /dev/null
+++ b/src/libexpr/value-to-xml.cc
@@ -0,0 +1,149 @@
+#include "value-to-xml.hh"
+#include "xml-writer.hh"
+#include "nixexpr-ast.hh"
+#include "aterm.hh"
+#include "util.hh"
+
+#include <cstdlib>
+
+
+namespace nix {
+
+    
+static XMLAttrs singletonAttrs(const string & name, const string & value)
+{
+    XMLAttrs attrs;
+    attrs[name] = value;
+    return attrs;
+}
+
+
+static void printValueAsXML(EvalState & state, bool strict, Value & v,
+    XMLWriter & doc, PathSet & context, PathSet & drvsSeen);
+
+
+static void showAttrs(EvalState & state, bool strict, Bindings & attrs,
+    XMLWriter & doc, PathSet & context, PathSet & drvsSeen)
+{
+    StringSet names;
+    foreach (Bindings::iterator, i, attrs)
+        names.insert(aterm2String(i->first));
+    foreach (StringSet::iterator, i, names) {
+        XMLOpenElement _(doc, "attr", singletonAttrs("name", *i));
+        printValueAsXML(state, strict, attrs[toATerm(*i)], doc, context, drvsSeen);
+    }
+}
+
+
+static void printPatternAsXML(Pattern pat, XMLWriter & doc)
+{
+    ATerm name;
+    ATermList formals;
+    ATermBool ellipsis;
+    if (matchVarPat(pat, name))
+        doc.writeEmptyElement("varpat", singletonAttrs("name", aterm2String(name)));
+    else if (matchAttrsPat(pat, formals, ellipsis, name)) {
+        XMLAttrs attrs;
+        if (name != sNoAlias) attrs["name"] = aterm2String(name);
+        if (ellipsis == eTrue) attrs["ellipsis"] = "1";
+        XMLOpenElement _(doc, "attrspat", attrs);
+        for (ATermIterator i(formals); i; ++i) {
+            Expr name; ATerm dummy;
+            if (!matchFormal(*i, name, dummy)) abort();
+            doc.writeEmptyElement("attr", singletonAttrs("name", aterm2String(name)));
+        }
+    }
+}
+
+
+static void printValueAsXML(EvalState & state, bool strict, Value & v,
+    XMLWriter & doc, PathSet & context, PathSet & drvsSeen)
+{
+    checkInterrupt();
+
+    if (strict) state.forceValue(v);
+        
+    switch (v.type) {
+
+        case tInt:
+            doc.writeEmptyElement("int", singletonAttrs("value", (format("%1%") % v.integer).str()));
+            break;
+
+        case tBool:
+            doc.writeEmptyElement("bool", singletonAttrs("value", v.boolean ? "true" : "false"));
+            break;
+
+        case tString:
+            /* !!! show the context? */
+            doc.writeEmptyElement("string", singletonAttrs("value", v.string.s));
+            break;
+
+        case tPath:
+            doc.writeEmptyElement("path", singletonAttrs("value", v.path));
+            break;
+
+        case tNull:
+            doc.writeEmptyElement("null");
+            break;
+
+        case tAttrs:
+            if (state.isDerivation(v)) {
+                XMLAttrs xmlAttrs;
+            
+                Bindings::iterator a = v.attrs->find(toATerm("derivation"));
+
+                Path drvPath;
+                a = v.attrs->find(toATerm("drvPath"));
+                if (a != v.attrs->end() && a->second.type == tString)
+                    xmlAttrs["drvPath"] = drvPath = a->second.string.s;
+        
+                a = v.attrs->find(toATerm("outPath"));
+                if (a != v.attrs->end() && a->second.type == tString)
+                    xmlAttrs["outPath"] = a->second.string.s;
+
+                XMLOpenElement _(doc, "derivation", xmlAttrs);
+
+                if (drvPath != "" && drvsSeen.find(drvPath) == drvsSeen.end()) {
+                    drvsSeen.insert(drvPath);
+                    showAttrs(state, strict, *v.attrs, doc, context, drvsSeen);
+                } else
+                    doc.writeEmptyElement("repeated");
+            }
+
+            else {
+                XMLOpenElement _(doc, "attrs");
+                showAttrs(state, strict, *v.attrs, doc, context, drvsSeen);
+            }
+            
+            break;
+
+        case tList: {
+            XMLOpenElement _(doc, "list");
+            for (unsigned int n = 0; n < v.list.length; ++n)
+                printValueAsXML(state, strict, v.list.elems[n], doc, context, drvsSeen);
+            break;
+        }
+
+        case tLambda: {
+            XMLOpenElement _(doc, "function");
+            printPatternAsXML(v.lambda.pat, doc);
+            break;
+        }
+
+        default:
+            doc.writeEmptyElement("unevaluated");
+    }
+}
+
+
+void printValueAsXML(EvalState & state, bool strict,
+    Value & v, std::ostream & out, PathSet & context)
+{
+    XMLWriter doc(true, out);
+    XMLOpenElement root(doc, "expr");
+    PathSet drvsSeen;    
+    printValueAsXML(state, strict, v, doc, context, drvsSeen);
+}
+
+ 
+}