/** * @file llsdutil.h * @author Phoenix * @date 2006-05-24 * @brief Utility classes, functions, etc, for using structured data. * * $LicenseInfo:firstyear=2006&license=viewerlgpl$ * Second Life Viewer Source Code * Copyright (C) 2010, Linden Research, Inc. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; * version 2.1 of the License only. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA * * Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA * $/LicenseInfo$ */ #ifndef LL_LLSDUTIL_H #define LL_LLSDUTIL_H class LLSD; // U32 LL_COMMON_API LLSD ll_sd_from_U32(const U32); LL_COMMON_API U32 ll_U32_from_sd(const LLSD& sd); // U64 LL_COMMON_API LLSD ll_sd_from_U64(const U64); LL_COMMON_API U64 ll_U64_from_sd(const LLSD& sd); // IP Address LL_COMMON_API LLSD ll_sd_from_ipaddr(const U32); LL_COMMON_API U32 ll_ipaddr_from_sd(const LLSD& sd); // Binary to string LL_COMMON_API LLSD ll_string_from_binary(const LLSD& sd); //String to binary LL_COMMON_API LLSD ll_binary_from_string(const LLSD& sd); // Serializes sd to static buffer and returns pointer, useful for gdb debugging. LL_COMMON_API char* ll_print_sd(const LLSD& sd); // Serializes sd to static buffer and returns pointer, using "pretty printing" mode. LL_COMMON_API char* ll_pretty_print_sd_ptr(const LLSD* sd); LL_COMMON_API char* ll_pretty_print_sd(const LLSD& sd); //compares the structure of an LLSD to a template LLSD and stores the //"valid" values in a 3rd LLSD. Default values //are pulled from the template. Extra keys/values in the test //are ignored in the resultant LLSD. Ordering of arrays matters //Returns false if the test is of same type but values differ in type //Otherwise, returns true LL_COMMON_API BOOL compare_llsd_with_template( const LLSD& llsd_to_test, const LLSD& template_llsd, LLSD& resultant_llsd); /** * Recursively determine whether a given LLSD data block "matches" another * LLSD prototype. The returned string is empty() on success, non-empty() on * mismatch. * * This function tests structure (types) rather than data values. It is * intended for when a consumer expects an LLSD block with a particular * structure, and must succinctly detect whether the arriving block is * well-formed. For instance, a test of the form: * @code * if (! (data.has("request") && data.has("target") && data.has("modifier") ...)) * @endcode * could instead be expressed by initializing a prototype LLSD map with the * required keys and writing: * @code * if (! llsd_matches(prototype, data).empty()) * @endcode * * A non-empty return value is an error-message fragment intended to indicate * to (English-speaking) developers where in the prototype structure the * mismatch occurred. * * * If a slot in the prototype isUndefined(), then anything is valid at that * place in the real object. (Passing prototype == LLSD() matches anything * at all.) * * An array in the prototype must match a data array at least that large. * (Additional entries in the data array are ignored.) Every isDefined() * entry in the prototype array must match the corresponding entry in the * data array. * * A map in the prototype must match a map in the data. Every key in the * prototype map must match a corresponding key in the data map. (Additional * keys in the data map are ignored.) Every isDefined() value in the * prototype map must match the corresponding key's value in the data map. * * Scalar values in the prototype are tested for @em type rather than value. * For instance, a String in the prototype matches any String at all. In * effect, storing an Integer at a particular place in the prototype asserts * that the caller intends to apply asInteger() to the corresponding slot in * the data. * * A String in the prototype matches String, Boolean, Integer, Real, UUID, * Date and URI, because asString() applied to any of these produces a * meaningful result. * * Similarly, a Boolean, Integer or Real in the prototype can match any of * Boolean, Integer or Real in the data -- or even String. * * UUID matches UUID or String. * * Date matches Date or String. * * URI matches URI or String. * * Binary in the prototype matches only Binary in the data. * * @TODO: when a Boolean, Integer or Real in the prototype matches a String in * the data, we should examine the String @em value to ensure it can be * meaningfully converted to the requested type. The same goes for UUID, Date * and URI. */ LL_COMMON_API std::string llsd_matches(const LLSD& prototype, const LLSD& data, const std::string& pfx=""); /// Deep equality LL_COMMON_API bool llsd_equals(const LLSD& lhs, const LLSD& rhs); // Simple function to copy data out of input & output iterators if // there is no need for casting. template<typename Input> LLSD llsd_copy_array(Input iter, Input end) { LLSD dest; for (; iter != end; ++iter) { dest.append(*iter); } return dest; } #endif // LL_LLSDUTIL_H