Changed XML and JSON databindings to use lazy lists and writer functions instead of STL streams, to help integrate them with HTTPD and CURL, which don't use streams.

git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@821715 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 96 insertions, 0 deletions

diff --git a/cpp/sca/kernel/slist.hpp b/cpp/sca/kernel/slist.hpp
new file mode 100644
index 0000000000..54c2d77574
--- /dev/null
+++ b/cpp/sca/kernel/slist.hpp
@@ -0,0 +1,96 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+/* $Rev$ $Date$ */
+
+#ifndef tuscany_slist_hpp
+#define tuscany_slist_hpp
+
+/**
+ * Useful functions to work with lists of strings and character streams.
+ */
+
+#include <iostream>
+#include <string>
+#include "function.hpp"
+#include "list.hpp"
+
+namespace tuscany {
+
+/**
+ * Tokenize a string into a list of strings.
+ */
+const list<std::string> tokenize(const std::string& sep, const std::string& str) {
+    struct nested {
+        static const list<std::string> tokenize(const std::string& sep, const std::string& str, const unsigned int start = 0) {
+            if (start >= str.length())
+                return list<std::string>();
+            const unsigned int i = str.find_first_of(sep, start);
+            if (i == std::string::npos)
+                return makeList(str.substr(start));
+            return cons(str.substr(start, i - start), tokenize(sep, str, i + 1));
+        }
+    };
+    return nested::tokenize(sep, str, 0);
+}
+
+/**
+ * Returns a lazy list view of an input stream.
+ */
+struct ilistRead{
+    std::istream &is;
+    ilistRead(std::istream& is) : is(is) {
+    }
+    const list<std::string> operator()() {
+        char buffer[1024];
+        is.read(buffer, 1024);
+        const int n = is.gcount();
+        if (n ==0)
+            return list<std::string>();
+        return cons(std::string(buffer, n), (*this)());
+    }
+};
+
+const list<std::string> makeStreamList(std::istream& is) {
+    return ilistRead(is)();
+}
+
+/**
+ * Fragment the first element of a list of strings to fit the given max length.
+ */
+const list<std::string> fragment(list<std::string> l, unsigned int max) {
+    const std::string s = car(l);
+    if (s.length() <= max)
+        return l;
+    return cons(s.substr(0, max), cons(s.substr(max), cdr(l)));
+}
+
+/**
+ * Write a list of strings to an output stream.
+ */
+std::ostream& write(const list<std::string>& l, std::ostream& os) {
+    if(isNil(l))
+        return os;
+    os << car(l);
+    return write(cdr(l), os);
+}
+
+}
+
+#endif /* tuscany_slist_hpp */