lib/yajl/Handle: libyajl C++ bindings

src/lib/yajl/Handle.hxx

@@ -0,0 +1,93 @@
+/*
+ * Copyright (C) 2018 Max Kellermann <max.kellermann@gmail.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
+ * FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef YAJL_HANDLE_HXX
+#define YAJL_HANDLE_HXX
+
+#include "util/RuntimeError.hxx"
+#include "util/ScopeExit.hxx"
+
+#include <yajl/yajl_parse.h>
+
+#include <stdexcept>
+#include <algorithm>
+
+namespace Yajl {
+
+/**
+ * OO wrapper for "struct curl_slist *".
+ */
+class Handle {
+	yajl_handle handle = nullptr;
+
+public:
+	Handle() = default;
+
+	Handle(const yajl_callbacks *callbacks,
+	       yajl_alloc_funcs *afs,
+	       void *ctx) noexcept
+		:handle(yajl_alloc(callbacks, afs, ctx)) {}
+
+	Handle(Handle &&src) noexcept
+		:handle(std::exchange(src.handle, nullptr)) {}
+
+	~Handle() noexcept {
+		if (handle != nullptr)
+			yajl_free(handle);
+	}
+
+	Handle &operator=(Handle &&src) noexcept {
+		std::swap(handle, src.handle);
+		return *this;
+	}
+
+	void Parse(const unsigned char *jsonText, size_t jsonTextLength) {
+		HandleStatus(yajl_parse(handle, jsonText, jsonTextLength));
+	}
+
+	void CompleteParse() {
+		HandleStatus(yajl_complete_parse(handle));
+	}
+
+private:
+	void HandleStatus(yajl_status status) {
+		if (status == yajl_status_error) {
+			unsigned char *str = yajl_get_error(handle, false,
+							    nullptr, 0);
+			AtScopeExit(this, str) {
+				yajl_free_error(handle, str);
+			};
+			throw FormatRuntimeError("Failed to parse JSON: %s", str);
+		}
+	}
+};
+
+} // namespace Yajl
+
+#endif