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Merge pull request #127 from cdunn2001/removeIndex

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`Value::removeIndex()`

See issue #28.
This commit is contained in:
Christopher Dunn 2015-01-21 16:08:25 -06:00
commit 40810fe326
3 changed files with 48 additions and 0 deletions
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8
include/json/value.h
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@ -395,6 +395,14 @@ Json::Value obj_value(Json::objectValue); // {}
Value removeMember(const char* key);
/// Same as removeMember(const char*)
Value removeMember(const std::string& key);
/** \brief Remove the indexed array element.
O(n) expensive operations.
Update 'removed' iff removed.
(This is a better pattern than removeMember().)
\return true iff removed (no exceptions)
*/
bool removeIndex(ArrayIndex i, Value* removed);
/// Return true if the object has a member named key.
bool isMember(const char* key) const;

28
src/lib_json/json_value.cpp
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@ -1018,6 +1018,34 @@ Value Value::removeMember(const std::string& key) {
return removeMember(key.c_str());
}
bool Value::removeIndex(ArrayIndex index, Value* removed) {
if (type_ != arrayValue) {
return false;
}
#ifdef JSON_VALUE_USE_INTERNAL_MAP
JSON_FAIL_MESSAGE("removeIndex is not implemented for ValueInternalArray.");
return false;
#else
CZString key(index);
ObjectValues::iterator it = value_.map_->find(key);
if (it == value_.map_->end()) {
return false;
}
*removed = it->second;
ArrayIndex oldSize = size();
// shift left all items left, into the place of the "removed"
for (ArrayIndex i = index; i < (oldSize - 1); ++i){
CZString key(i);
(*value_.map_)[key] = (*this)[i + 1];
}
// erase the last one ("leftover")
CZString keyLast(oldSize - 1);
ObjectValues::iterator itLast = value_.map_->find(keyLast);
value_.map_->erase(itLast);
return true;
#endif
}
#ifdef JSON_USE_CPPTL
Value Value::get(const CppTL::ConstString& key,
const Value& defaultValue) const {

12
src/test_lib_json/main.cpp
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@ -198,6 +198,14 @@ JSONTEST_FIXTURE(ValueTest, objects) {
object1_["some other id"] = "foo";
JSONTEST_ASSERT_EQUAL(Json::Value("foo"), object1_["some other id"]);
JSONTEST_ASSERT_EQUAL(Json::Value("foo"), object1_["some other id"]);
// Remove.
Json::Value got;
got = object1_.removeMember("some other id");
JSONTEST_ASSERT_EQUAL(Json::Value("foo"), got);
got = object1_.removeMember("some other id");
JSONTEST_ASSERT_EQUAL(Json::nullValue, got);
}
JSONTEST_FIXTURE(ValueTest, arrays) {
@ -240,6 +248,10 @@ JSONTEST_FIXTURE(ValueTest, arrays) {
array1_[2] = Json::Value(17);
JSONTEST_ASSERT_EQUAL(Json::Value(), array1_[1]);
JSONTEST_ASSERT_EQUAL(Json::Value(17), array1_[2]);
Json::Value got;
JSONTEST_ASSERT_EQUAL(true, array1_.removeIndex(2, &got));
JSONTEST_ASSERT_EQUAL(Json::Value(17), got);
JSONTEST_ASSERT_EQUAL(false, array1_.removeIndex(2, &got)); // gone now
}
JSONTEST_FIXTURE(ValueTest, null) {