diff --git a/src/dcd/server/lib.d b/src/dcd/server/lib.d
new file mode 100644
index 00000000..7e4ab087
--- /dev/null
+++ b/src/dcd/server/lib.d
@@ -0,0 +1,186 @@
+module dcd.server.lib;
+
+import std.string: fromStringz;
+
+import core.runtime;
+import core.stdc.stdio;
+import core.stdc.stdlib;
+import core.stdc.string;
+import core.stdc.ctype;
+import core.stdc.stdarg;
+
+import dcd.common.messages;
+import dcd.server.autocomplete;
+
+import dsymbol.modulecache;
+
+__gshared:
+
+ModuleCache cache;
+
+extern(C) export void dcd_init(string[] importPaths)
+{
+    rt_init();
+    cache.addImportPaths(importPaths);
+}
+
+extern(C) export void dcd_add_imports(string[] importPaths)
+{
+    cache.addImportPaths(importPaths);
+}
+
+extern(C) export void dcd_clear()
+{
+    cache.clear();
+}
+
+extern(C) export AutocompleteResponse dcd_complete(const(char)* content, int position)
+{
+    AutocompleteRequest request;
+    request.fileName = "stdin";
+    request.cursorPosition = position;
+    request.kind |= RequestKind.autocomplete;
+    request.sourceCode = cast(ubyte[]) fromStringz(content);
+
+    auto ret = complete(request, cache);
+    return ret;
+}
+
+struct DSymbolInfo
+{
+    string name;
+    ubyte kind;
+    size_t[2] range;
+    DSymbolInfo[] children;
+}
+
+extern(C) export DSymbolInfo[] dcd_document_symbols(const(char)* content)
+{
+    import containers.ttree : TTree;
+    import containers.hashset;
+    import dcd.server.autocomplete.util;
+
+    import dparse.lexer;
+    import dparse.rollback_allocator;
+
+    import dsymbol.builtin.names;
+    import dsymbol.builtin.symbols;
+    import dsymbol.conversion;
+    import dsymbol.modulecache;
+    import dsymbol.scope_;
+    import dsymbol.string_interning;
+    import dsymbol.symbol;
+    import dsymbol.ufcs;
+    import dsymbol.utils;
+
+    import dcd.common.constants;
+    import dcd.common.messages;
+
+    DSymbolInfo[] ret;
+
+    AutocompleteRequest request;
+    request.fileName = "stdin";
+    request.cursorPosition = 0;
+    request.kind |= RequestKind.autocomplete;
+    request.sourceCode = cast(ubyte[]) fromStringz(content);
+
+    LexerConfig config;
+    config.fileName = "";
+    auto sc = StringCache(request.sourceCode.length.optimalBucketCount);
+    auto tokenArray = getTokensForParser(cast(ubyte[]) request.sourceCode, config, &sc);
+    RollbackAllocator rba;
+    auto pair = generateAutocompleteTrees(tokenArray, &rba, -1, cache);
+    scope(exit) pair.destroy();
+
+
+    void check(DSymbol* it, ref int p, DSymbolInfo* info)
+    {
+        //for (int i = 0; i < p; i++)
+        //fprintf(stderr, " ");
+        //fprintf(stderr, "loc: %ld k: %c sym: %.*s\n", it.location, cast(char) it.kind, it.name.length, it.name.ptr);
+
+        p += 1;
+
+        info.name = it.name;
+        info.range[0] = it.location;
+
+        if (it.location_end == 0)
+            info.range[1] = it.location + it.name.length;
+        else
+            info.range[1] = it.location_end;
+        info.kind = it.kind;
+
+        foreach(sym; it.opSlice())
+        {
+            if (sym.symbolFile != "stdin") continue;
+
+            DSymbolInfo child;
+            check(sym, p, &child);
+            info.children ~= child;
+       }
+       p -= 1;
+    }
+
+    int pos = 0;
+    foreach (symbol; pair.scope_.symbols)
+    {
+        if (symbol.symbolFile != "stdin") continue;
+        DSymbolInfo info;
+        check(symbol, pos, &info);
+        ret ~= info;
+    }
+
+    return ret;
+}
+
+struct Location
+{
+    string path;
+    size_t position;
+}
+
+extern(C) export Location[] dcd_definition(const(char)* content, int position)
+{
+    import containers.ttree : TTree;
+    import containers.hashset;
+    import dcd.server.autocomplete.util;
+
+    import dparse.lexer;
+    import dparse.rollback_allocator;
+
+    import dsymbol.builtin.names;
+    import dsymbol.builtin.symbols;
+    import dsymbol.conversion;
+    import dsymbol.modulecache;
+    import dsymbol.scope_;
+    import dsymbol.string_interning;
+    import dsymbol.symbol;
+    import dsymbol.ufcs;
+    import dsymbol.utils;
+
+    import dcd.common.constants;
+    import dcd.common.messages;
+
+    AutocompleteRequest request;
+    request.fileName = "stdin";
+    request.cursorPosition = position;
+    request.kind |= RequestKind.autocomplete;
+    request.sourceCode = cast(ubyte[]) fromStringz(content);
+
+    RollbackAllocator rba;
+    auto sc = StringCache(request.sourceCode.length.optimalBucketCount);
+    SymbolStuff stuff = getSymbolsForCompletion(request, CompletionType.location,
+        &rba, sc, cache);
+    scope(exit) stuff.destroy();
+
+    Location[] ret;
+    if (stuff.symbols.length > 0)
+    {
+        foreach(sym; stuff.symbols)
+        {
+            //fprintf(stderr, "found: %.*s  at: %.*s -> %lu\n", sym.name.length, sym.name.ptr, sym.symbolFile.length, sym.symbolFile.ptr, sym.location);
+            ret ~= Location(sym.symbolFile, sym.location);
+        }
+    }
+    return ret;
+}