2 files changed, 354 insertions, 0 deletions
diff --git a/src/libutil/json.cc b/src/libutil/json.cc
new file mode 100644
index 000000000000..619b1d631b9a
--- /dev/null
+++ b/src/libutil/json.cc
@@ -0,0 +1,171 @@
+#include "json.hh"
+
+#include <iomanip>
+#include <cstring>
+
+namespace nix {
+
+void toJSON(std::ostream & str, const char * start, const char * end)
+{
+    str << '"';
+    for (auto i = start; i != end; i++)
+        if (*i == '\"' || *i == '\\') str << '\\' << *i;
+        else if (*i == '\n') str << "\\n";
+        else if (*i == '\r') str << "\\r";
+        else if (*i == '\t') str << "\\t";
+        else if (*i >= 0 && *i < 32)
+            str << "\\u" << std::setfill('0') << std::setw(4) << std::hex << (uint16_t) *i << std::dec;
+        else str << *i;
+    str << '"';
+}
+
+void toJSON(std::ostream & str, const std::string & s)
+{
+    toJSON(str, s.c_str(), s.c_str() + s.size());
+}
+
+void toJSON(std::ostream & str, const char * s)
+{
+    if (!s) str << "null"; else toJSON(str, s, s + strlen(s));
+}
+
+void toJSON(std::ostream & str, unsigned long n)
+{
+    str << n;
+}
+
+void toJSON(std::ostream & str, long n)
+{
+    str << n;
+}
+
+void toJSON(std::ostream & str, double f)
+{
+    str << f;
+}
+
+void toJSON(std::ostream & str, bool b)
+{
+    str << (b ? "true" : "false");
+}
+
+JSONWriter::JSONWriter(std::ostream & str, bool indent)
+    : state(new JSONState(str, indent))
+{
+    state->stack.push_back(this);
+}
+
+JSONWriter::JSONWriter(JSONState * state)
+    : state(state)
+{
+    state->stack.push_back(this);
+}
+
+JSONWriter::~JSONWriter()
+{
+    assertActive();
+    state->stack.pop_back();
+    if (state->stack.empty()) delete state;
+}
+
+void JSONWriter::comma()
+{
+    assertActive();
+    if (first) {
+        first = false;
+    } else {
+        state->str << ',';
+    }
+    if (state->indent) indent();
+}
+
+void JSONWriter::indent()
+{
+    state->str << '\n' << std::string(state->depth * 2, ' ');
+}
+
+void JSONList::open()
+{
+    state->depth++;
+    state->str << '[';
+}
+
+JSONList::~JSONList()
+{
+    state->depth--;
+    if (state->indent && !first) indent();
+    state->str << "]";
+}
+
+JSONList JSONList::list()
+{
+    comma();
+    return JSONList(state);
+}
+
+JSONObject JSONList::object()
+{
+    comma();
+    return JSONObject(state);
+}
+
+JSONPlaceholder JSONList::placeholder()
+{
+    comma();
+    return JSONPlaceholder(state);
+}
+
+void JSONObject::open()
+{
+    state->depth++;
+    state->str << '{';
+}
+
+JSONObject::~JSONObject()
+{
+    state->depth--;
+    if (state->indent && !first) indent();
+    state->str << "}";
+}
+
+void JSONObject::attr(const std::string & s)
+{
+    comma();
+    toJSON(state->str, s);
+    state->str << ':';
+    if (state->indent) state->str << ' ';
+}
+
+JSONList JSONObject::list(const std::string & name)
+{
+    attr(name);
+    return JSONList(state);
+}
+
+JSONObject JSONObject::object(const std::string & name)
+{
+    attr(name);
+    return JSONObject(state);
+}
+
+JSONPlaceholder JSONObject::placeholder(const std::string & name)
+{
+    attr(name);
+    return JSONPlaceholder(state);
+}
+
+JSONList JSONPlaceholder::list()
+{
+    assertValid();
+    first = false;
+    return JSONList(state);
+}
+
+JSONObject JSONPlaceholder::object()
+{
+    assertValid();
+    first = false;
+    return JSONObject(state);
+}
+
+}
diff --git a/src/libutil/json.hh b/src/libutil/json.hh
new file mode 100644
index 000000000000..852000a51b38
--- /dev/null
+++ b/src/libutil/json.hh
@@ -0,0 +1,183 @@
+#pragma once
+
+#include <iostream>
+#include <vector>
+#include <cassert>
+
+namespace nix {
+
+void toJSON(std::ostream & str, const char * start, const char * end);
+void toJSON(std::ostream & str, const std::string & s);
+void toJSON(std::ostream & str, const char * s);
+void toJSON(std::ostream & str, unsigned long n);
+void toJSON(std::ostream & str, long n);
+void toJSON(std::ostream & str, double f);
+void toJSON(std::ostream & str, bool b);
+
+class JSONWriter
+{
+protected:
+
+    struct JSONState
+    {
+        std::ostream & str;
+        bool indent;
+        size_t depth = 0;
+        std::vector<JSONWriter *> stack;
+        JSONState(std::ostream & str, bool indent) : str(str), indent(indent) { }
+        ~JSONState()
+        {
+            assert(stack.empty());
+        }
+    };
+
+    JSONState * state;
+
+    bool first = true;
+
+    JSONWriter(std::ostream & str, bool indent);
+
+    JSONWriter(JSONState * state);
+
+    ~JSONWriter();
+
+    void assertActive()
+    {
+        assert(!state->stack.empty() && state->stack.back() == this);
+    }
+
+    void comma();
+
+    void indent();
+};
+
+class JSONObject;
+class JSONPlaceholder;
+
+class JSONList : JSONWriter
+{
+private:
+
+    friend class JSONObject;
+    friend class JSONPlaceholder;
+
+    void open();
+
+    JSONList(JSONState * state)
+        : JSONWriter(state)
+    {
+        open();
+    }
+
+public:
+
+    JSONList(std::ostream & str, bool indent = false)
+        : JSONWriter(str, indent)
+    {
+        open();
+    }
+
+    ~JSONList();
+
+    template<typename T>
+    JSONList & elem(const T & v)
+    {
+        comma();
+        toJSON(state->str, v);
+        return *this;
+    }
+
+    JSONList list();
+
+    JSONObject object();
+
+    JSONPlaceholder placeholder();
+};
+
+class JSONObject : JSONWriter
+{
+private:
+
+    friend class JSONList;
+    friend class JSONPlaceholder;
+
+    void open();
+
+    JSONObject(JSONState * state)
+        : JSONWriter(state)
+    {
+        open();
+    }
+
+    void attr(const std::string & s);
+
+public:
+
+    JSONObject(std::ostream & str, bool indent = false)
+        : JSONWriter(str, indent)
+    {
+        open();
+    }
+
+    ~JSONObject();
+
+    template<typename T>
+    JSONObject & attr(const std::string & name, const T & v)
+    {
+        attr(name);
+        toJSON(state->str, v);
+        return *this;
+    }
+
+    JSONList list(const std::string & name);
+
+    JSONObject object(const std::string & name);
+
+    JSONPlaceholder placeholder(const std::string & name);
+};
+
+class JSONPlaceholder : JSONWriter
+{
+
+private:
+
+    friend class JSONList;
+    friend class JSONObject;
+
+    JSONPlaceholder(JSONState * state)
+        : JSONWriter(state)
+    {
+    }
+
+    void assertValid()
+    {
+        assertActive();
+        assert(first);
+    }
+
+public:
+
+    JSONPlaceholder(std::ostream & str, bool indent = false)
+        : JSONWriter(str, indent)
+    {
+    }
+
+    ~JSONPlaceholder()
+    {
+        assert(!first || std::uncaught_exception());
+    }
+
+    template<typename T>
+    void write(const T & v)
+    {
+        assertValid();
+        first = false;
+        toJSON(state->str, v);
+    }
+
+    JSONList list();
+
+    JSONObject object();
+};
+
+}