Github user phrocker commented on a diff in the pull request:
https://github.com/apache/nifi-minifi-cpp/pull/219#discussion_r156815480
--- Diff: extensions/expression-language/Expression.cpp ---
@@ -64,12 +64,44 @@ std::string expr_toUpper(const std::vector<std::string>
&args) {
return result;
}
+std::string expr_substring(const std::vector<std::string> &args) {
+ if (args.size() < 3) {
+ return args[0].substr(std::stoul(args[1]));
+ } else {
+ return args[0].substr(std::stoul(args[1]), std::stoul(args[2]));
+ }
+}
+
+std::string expr_substringBefore(const std::vector<std::string> &args) {
+ return args[0].substr(0, args[0].find(args[1]));
+}
+
+std::string expr_substringBeforeLast(const std::vector<std::string> &args)
{
+ size_t last_pos = 0;
+ while (args[0].find(args[1], last_pos + 1) != std::string::npos) {
+ last_pos = args[0].find(args[1], last_pos + 1);
+ }
+ return args[0].substr(0, last_pos);
+}
+
+std::string expr_substringAfter(const std::vector<std::string> &args) {
+ return args[0].substr(args[0].find(args[1]) + args[1].length());
+}
+
+std::string expr_substringAfterLast(const std::vector<std::string> &args) {
+ size_t last_pos = 0;
+ while (args[0].find(args[1], last_pos + 1) != std::string::npos) {
+ last_pos = args[0].find(args[1], last_pos + 1);
+ }
+ return args[0].substr(last_pos + args[1].length());
+}
+
template<std::string T(const std::vector<std::string> &)>
Expression make_dynamic_function_incomplete(const std::string
&function_name,
const std::vector<Expression>
&args,
std::size_t num_args) {
- if (args.size() == num_args) {
--- End diff --
Based on my comment below, it seems like we'll simply throw "Attempted to
call incomplete function" Is this a correct interpretation?
---
