Introduce cmArgumentParser

1 files changed, 93 insertions, 0 deletions

diff --git a/Source/cmArgumentParser.cxx b/Source/cmArgumentParser.cxx
new file mode 100644
index 0000000000..9a9932c569
--- /dev/null
+++ b/Source/cmArgumentParser.cxx
@@ -0,0 +1,93 @@
+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+#include "cmArgumentParser.h"
+
+#include <algorithm>
+#include <type_traits>
+
+namespace ArgumentParser {
+
+auto ActionMap::Emplace(cm::string_view name, Action action)
+  -> std::pair<iterator, bool>
+{
+  auto const it =
+    std::lower_bound(this->begin(), this->end(), name,
+                     [](value_type const& elem, cm::string_view const& k) {
+                       return elem.first < k;
+                     });
+  return (it != this->end() && it->first == name)
+    ? std::make_pair(it, false)
+    : std::make_pair(this->emplace(it, name, std::move(action)), true);
+}
+
+auto ActionMap::Find(cm::string_view name) const -> const_iterator
+{
+  auto const it =
+    std::lower_bound(this->begin(), this->end(), name,
+                     [](value_type const& elem, cm::string_view const& k) {
+                       return elem.first < k;
+                     });
+  return (it != this->end() && it->first == name) ? it : this->end();
+}
+
+void Instance::Bind(bool& val)
+{
+  val = true;
+  this->CurrentString = nullptr;
+  this->CurrentList = nullptr;
+  this->ExpectValue = false;
+}
+
+void Instance::Bind(std::string& val)
+{
+  this->CurrentString = &val;
+  this->CurrentList = nullptr;
+  this->ExpectValue = true;
+}
+
+void Instance::Bind(StringList& val)
+{
+  this->CurrentString = nullptr;
+  this->CurrentList = &val;
+  this->ExpectValue = true;
+}
+
+void Instance::Bind(MultiStringList& val)
+{
+  this->CurrentString = nullptr;
+  this->CurrentList = (val.emplace_back(), &val.back());
+  this->ExpectValue = false;
+}
+
+void Instance::Consume(cm::string_view arg, void* result,
+                       std::vector<std::string>* unparsedArguments,
+                       std::vector<std::string>* keywordsMissingValue)
+{
+  auto const it = this->Bindings.Find(arg);
+  if (it != this->Bindings.end()) {
+    it->second(*this, result);
+    if (this->ExpectValue && keywordsMissingValue != nullptr) {
+      keywordsMissingValue->emplace_back(arg);
+    }
+    return;
+  }
+
+  if (this->CurrentString != nullptr) {
+    this->CurrentString->assign(std::string(arg));
+    this->CurrentString = nullptr;
+    this->CurrentList = nullptr;
+  } else if (this->CurrentList != nullptr) {
+    this->CurrentList->emplace_back(arg);
+  } else if (unparsedArguments != nullptr) {
+    unparsedArguments->emplace_back(arg);
+  }
+
+  if (this->ExpectValue) {
+    if (keywordsMissingValue != nullptr) {
+      keywordsMissingValue->pop_back();
+    }
+    this->ExpectValue = false;
+  }
+}
+
+} // namespace ArgumentParser