1 files changed, 126 insertions, 0 deletions
diff --git a/Source/cmGccDepfileLexerHelper.cxx b/Source/cmGccDepfileLexerHelper.cxx
new file mode 100644
index 0000000..957896f
--- /dev/null
+++ b/Source/cmGccDepfileLexerHelper.cxx
@@ -0,0 +1,126 @@
+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+#include "cmGccDepfileLexerHelper.h"
+
+#include <cstdio>
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "cmGccDepfileReaderTypes.h"
+
+#include "LexerParser/cmGccDepfileLexer.h"
+
+#ifdef _WIN32
+#  include "cmsys/Encoding.h"
+#endif
+
+bool cmGccDepfileLexerHelper::readFile(const char* filePath)
+{
+#ifdef _WIN32
+  wchar_t* wpath = cmsysEncoding_DupToWide(filePath);
+  FILE* file = _wfopen(wpath, L"rb");
+  free(wpath);
+#else
+  FILE* file = fopen(filePath, "r");
+#endif
+  if (!file) {
+    return false;
+  }
+  newEntry();
+  yyscan_t scanner;
+  cmGccDepfile_yylex_init(&scanner);
+  cmGccDepfile_yyset_extra(this, scanner);
+  cmGccDepfile_yyrestart(file, scanner);
+  cmGccDepfile_yylex(scanner);
+  cmGccDepfile_yylex_destroy(scanner);
+  sanitizeContent();
+  fclose(file);
+  return true;
+}
+
+void cmGccDepfileLexerHelper::newEntry()
+{
+  this->HelperState = State::Rule;
+  this->Content.emplace_back();
+  newRule();
+}
+
+void cmGccDepfileLexerHelper::newRule()
+{
+  auto& entry = this->Content.back();
+  if (entry.rules.empty() || !entry.rules.back().empty()) {
+    entry.rules.emplace_back();
+  }
+}
+
+void cmGccDepfileLexerHelper::newDependency()
+{
+  // printf("NEW DEP\n");
+  this->HelperState = State::Dependency;
+  if (this->Content.back().paths.empty() ||
+      !this->Content.back().paths.back().empty()) {
+    this->Content.back().paths.emplace_back();
+  }
+}
+
+void cmGccDepfileLexerHelper::newRuleOrDependency()
+{
+  if (this->HelperState == State::Rule) {
+    newRule();
+  } else {
+    newDependency();
+  }
+}
+
+void cmGccDepfileLexerHelper::addToCurrentPath(const char* s)
+{
+  if (this->Content.empty()) {
+    return;
+  }
+  cmGccStyleDependency* dep = &this->Content.back();
+  std::string* dst = nullptr;
+  switch (this->HelperState) {
+    case State::Rule: {
+      if (dep->rules.empty()) {
+        return;
+      }
+      dst = &dep->rules.back();
+    } break;
+    case State::Dependency: {
+      if (dep->paths.empty()) {
+        return;
+      }
+      dst = &dep->paths.back();
+    } break;
+  }
+  dst->append(s);
+}
+
+void cmGccDepfileLexerHelper::sanitizeContent()
+{
+  for (auto it = this->Content.begin(); it != this->Content.end();) {
+    // Remove empty rules
+    for (auto rit = it->rules.begin(); rit != it->rules.end();) {
+      if (rit->empty()) {
+        rit = it->rules.erase(rit);
+      } else {
+        ++rit;
+      }
+    }
+    // Remove the entry if rules are empty
+    if (it->rules.empty()) {
+      it = this->Content.erase(it);
+    } else {
+      // Remove empty paths
+      for (auto pit = it->paths.begin(); pit != it->paths.end();) {
+        if (pit->empty()) {
+          pit = it->paths.erase(pit);
+        } else {
+          ++pit;
+        }
+      }
+      ++it;
+    }
+  }
+}