121 lines
3.9 KiB
C++
121 lines
3.9 KiB
C++
#include "StarJsonPatch.hpp"
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#include "StarJsonPath.hpp"
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#include "StarLexicalCast.hpp"
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namespace Star {
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Json jsonPatch(Json const& base, JsonArray const& patch) {
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auto res = base;
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try {
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for (auto const& operation : patch) {
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res = JsonPatching::applyOperation(res, operation);
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}
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return res;
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} catch (JsonException const& e) {
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throw JsonPatchException(strf("Could not apply patch to base. {}", e.what()));
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}
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}
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namespace JsonPatching {
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static const StringMap<std::function<Json(Json, Json)>> functionMap = StringMap<std::function<Json(Json, Json)>>{
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{"test", std::bind(applyTestOperation, _1, _2)},
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{"remove", std::bind(applyRemoveOperation, _1, _2)},
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{"add", std::bind(applyAddOperation, _1, _2)},
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{"replace", std::bind(applyReplaceOperation, _1, _2)},
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{"move", std::bind(applyMoveOperation, _1, _2)},
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{"copy", std::bind(applyCopyOperation, _1, _2)},
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};
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Json applyOperation(Json const& base, Json const& op) {
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try {
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auto operation = op.getString("op");
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return JsonPatching::functionMap.get(operation)(base, op);
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} catch (JsonException const& e) {
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throw JsonPatchException(strf("Could not apply operation to base. {}", e.what()));
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} catch (MapException const&) {
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throw JsonPatchException(strf("Invalid operation: {}", op.getString("op")));
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}
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}
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Json applyTestOperation(Json const& base, Json const& op) {
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auto path = op.getString("path");
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auto value = op.opt("value");
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auto inverseTest = op.getBool("inverse", false);
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auto pointer = JsonPath::Pointer(path);
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try {
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auto testValue = pointer.get(base);
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if (!value) {
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if (inverseTest)
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throw JsonPatchTestFail(strf("Test operation failure, expected {} to be missing.", op.getString("path")));
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return base;
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}
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if ((value && (testValue == *value)) ^ inverseTest) {
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return base;
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}
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throw JsonPatchTestFail(strf("Test operation failure, expected {} found {}.", value, testValue));
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} catch (JsonPath::TraversalException& e) {
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if (inverseTest)
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return base;
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throw JsonPatchTestFail(strf("Test operation failure: {}", e.what()));
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}
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}
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Json applyRemoveOperation(Json const& base, Json const& op) {
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if (op.contains("search")) {
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String path = op.getString("path");
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auto pointer = JsonPath::Pointer(path);
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Json searchArray = pointer.get(base);
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Json searchValue = op.get("search");
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if (searchArray.type() == Json::Type::Array) {
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size_t index = 0;
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bool found = false;
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for (auto& e : searchArray.toArray()) {
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if (jsonCompare(e, searchValue)) {
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found = true;
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break;
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}
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index++;
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}
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if (found)
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searchArray = searchArray.eraseIndex(index);
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return pointer.add(pointer.remove(base), searchArray);
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} else {
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throw JsonPatchException(strf("Search operation failure, value at {} is not an array.", path));
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}
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} else {
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return JsonPath::Pointer(op.getString("path")).remove(base);
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}
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}
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Json applyAddOperation(Json const& base, Json const& op) {
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return JsonPath::Pointer(op.getString("path")).add(base, op.get("value"));
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}
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Json applyReplaceOperation(Json const& base, Json const& op) {
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auto pointer = JsonPath::Pointer(op.getString("path"));
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return pointer.add(pointer.remove(base), op.get("value"));
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}
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Json applyMoveOperation(Json const& base, Json const& op) {
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auto fromPointer = JsonPath::Pointer(op.getString("from"));
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auto toPointer = JsonPath::Pointer(op.getString("path"));
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Json value = fromPointer.get(base);
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return toPointer.add(fromPointer.remove(base), value);
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}
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Json applyCopyOperation(Json const& base, Json const& op) {
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auto fromPointer = JsonPath::Pointer(op.getString("from"));
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auto toPointer = JsonPath::Pointer(op.getString("path"));
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return toPointer.add(base, fromPointer.get(base));
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}
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}
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}
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