diff options
| -rw-r--r-- | indra/llcommon/lleventcoro.cpp | 50 | ||||
| -rw-r--r-- | indra/llcommon/llsdutil.cpp | 67 | ||||
| -rw-r--r-- | indra/llcommon/llsdutil.h | 25 |
3 files changed, 97 insertions, 45 deletions
diff --git a/indra/llcommon/lleventcoro.cpp b/indra/llcommon/lleventcoro.cpp index 56367b8f54..43e41f250d 100644 --- a/indra/llcommon/lleventcoro.cpp +++ b/indra/llcommon/lleventcoro.cpp @@ -36,6 +36,7 @@ // external library headers // other Linden headers #include "llsdserialize.h" +#include "llsdutil.h" #include "llerror.h" #include "llcoros.h" #include "llmake.h" @@ -92,57 +93,16 @@ std::string listenerNameForCoro() * In the degenerate case in which @a path is an empty array, @a dest will * @em become @a value rather than @em containing it. */ -void storeToLLSDPath(LLSD& dest, const LLSD& rawPath, const LLSD& value) +void storeToLLSDPath(LLSD& dest, const LLSD& path, const LLSD& value) { - if (rawPath.isUndefined()) + if (path.isUndefined()) { // no-op case return; } - // Arrange to treat rawPath uniformly as an array. If it's not already an - // array, store it as the only entry in one. - LLSD path; - if (rawPath.isArray()) - { - path = rawPath; - } - else - { - path.append(rawPath); - } - - // Need to indicate a current destination -- but that current destination - // needs to change as we step through the path array. Where normally we'd - // use an LLSD& to capture a subscripted LLSD lvalue, this time we must - // instead use a pointer -- since it must be reassigned. - LLSD* pdest = &dest; - - // Now loop through that array - for (LLSD::Integer i = 0; i < path.size(); ++i) - { - if (path[i].isString()) - { - // *pdest is an LLSD map - pdest = &((*pdest)[path[i].asString()]); - } - else if (path[i].isInteger()) - { - // *pdest is an LLSD array - pdest = &((*pdest)[path[i].asInteger()]); - } - else - { - // What do we do with Real or Array or Map or ...? - // As it's a coder error -- not a user error -- rub the coder's - // face in it so it gets fixed. - LL_ERRS("lleventcoro") << "storeToLLSDPath(" << dest << ", " << rawPath << ", " << value - << "): path[" << i << "] bad type " << path[i].type() << LL_ENDL; - } - } - - // Here *pdest is where we should store value. - *pdest = value; + // Drill down to where we should store 'value'. + llsd::drill(dest, path) = value; } /// For LLCoros::Future<LLSD>::make_callback(), the callback has a signature diff --git a/indra/llcommon/llsdutil.cpp b/indra/llcommon/llsdutil.cpp index 9d00395c0a..ad27f19e85 100644 --- a/indra/llcommon/llsdutil.cpp +++ b/indra/llcommon/llsdutil.cpp @@ -681,3 +681,70 @@ bool llsd_equals(const LLSD& lhs, const LLSD& rhs, int bits) return false; // pacify the compiler } } + +/***************************************************************************** +* llsd::drill() +*****************************************************************************/ +namespace llsd +{ + +LLSD& drill(LLSD& blob, const LLSD& rawPath) +{ + // Treat rawPath uniformly as an array. If it's not already an array, + // store it as the only entry in one. + LLSD path; + if (rawPath.isArray()) + { + path = rawPath; + } + else + { + path.append(rawPath); + } + + // Need to indicate a current destination -- but that current destination + // must change as we step through the path array. Where normally we'd use + // an LLSD& to capture a subscripted LLSD lvalue, this time we must + // instead use a pointer -- since it must be reassigned. + // Start by pointing to the input blob exactly as is. + LLSD* located{&blob}; + + // Extract the element of interest by walking path. Use an explicit index + // so that, in case of a bogus type in path, we can identify the specific + // path entry that's bad. + for (LLSD::Integer i = 0; i < path.size(); ++i) + { + const LLSD& key{path[i]}; + if (key.isString()) + { + // a string path element is a map key + located = &((*located)[key.asString()]); + } + else if (key.isInteger()) + { + // an integer path element is an array index + located = &((*located)[key.asInteger()]); + } + else + { + // What do we do with Real or Array or Map or ...? + // As it's a coder error -- not a user error -- rub the coder's + // face in it so it gets fixed. + LL_ERRS("llsdutil") << "drill(" << blob << ", " << rawPath + << "): path[" << i << "] bad type " + << sTypes.lookup(key.type()) << LL_ENDL; + } + } + + // dereference the pointer to return a reference to the element we found + return *located; +} + +LLSD drill(const LLSD& blob, const LLSD& path) +{ + // non-const drill() does exactly what we want. Temporarily cast away + // const-ness and use that. + return drill(const_cast<LLSD&>(blob), path); +} + +} // namespace llsd diff --git a/indra/llcommon/llsdutil.h b/indra/llcommon/llsdutil.h index 01ab6bcb8d..e659aa574e 100644 --- a/indra/llcommon/llsdutil.h +++ b/indra/llcommon/llsdutil.h @@ -142,6 +142,31 @@ template<typename Input> LLSD llsd_copy_array(Input iter, Input end) return dest; } +namespace llsd +{ + +/** + * Drill down to locate an element in 'blob' according to 'path', where 'path' + * is one of the following: + * + * - LLSD::String: 'blob' is an LLSD::Map. Find the entry with key 'path'. + * - LLSD::Integer: 'blob' is an LLSD::Array. Find the entry with index 'path'. + * - Any other 'path' type will be interpreted as LLSD::Array, and 'blob' is a + * nested structure. For each element of 'path': + * - If it's an LLSD::Integer, select the entry with that index from an + * LLSD::Array at that level. + * - If it's an LLSD::String, select the entry with that key from an + * LLSD::Map at that level. + * - Anything else is an error. + * + * By implication, if path.isUndefined() or otherwise equivalent to an empty + * LLSD::Array, drill() returns 'blob' as is. + */ +LLSD drill(const LLSD& blob, const LLSD& path); +LLSD& drill( LLSD& blob, const LLSD& path); + +} + /***************************************************************************** * LLSDArray *****************************************************************************/ |