2 files changed, 108 insertions, 0 deletions
diff --git a/src/support/command-line.cpp b/src/support/command-line.cpp
new file mode 100644
index 000000000..3c03d48f4
--- /dev/null
+++ b/src/support/command-line.cpp
@@ -0,0 +1,65 @@
+/*
+ * Copyright 2015 WebAssembly Community Group participants
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "support/command-line.h"
+
+namespace {
+bool optionIs(const char *arg, const char *LongOpt, const char *ShortOpt) {
+  return strcmp(arg, LongOpt) == 0 || strcmp(arg, ShortOpt) == 0;
+}
+bool startsWith(const char *str, const char *prefix) {
+  return strncmp(str, prefix, strlen(prefix)) == 0;
+}
+}  // anonymous namespace
+
+void wasm::processCommandLine(int argc, const char *argv[], Options *options,
+                              const char *help) {
+  assert(argc > 0 && "expect at least program name as an argument");
+  for (size_t i = 1, e = argc; i != e; ++i) {
+    if (optionIs(argv[i], "--help", "-h")) {
+      std::cerr << help;
+      exit(EXIT_SUCCESS);
+    } else if (optionIs(argv[i], "--debug", "-d")) {
+      options->debug = true;
+    } else if (optionIs(argv[i], "--output", "-o")) {
+      if (i + 1 == e) {
+        std::cerr << "No output file" << std::endl;
+        exit(EXIT_FAILURE);
+      }
+      if (options->outfile.size()) {
+        std::cerr << "Expected only one output file, got '" << options->outfile
+                  << "' and '" << argv[i] << "'" << std::endl;
+        exit(EXIT_FAILURE);
+      }
+      options->outfile = argv[++i];
+    } else if (startsWith(argv[i], "--")) {
+      size_t j = 2;
+      std::string name;
+      while (argv[i][j] && argv[i][j] != '=') {
+        name += argv[i][j];
+        j++;
+      }
+      options->extra[name] = argv[i][j] == '=' ? &argv[i][j + 1] : "(no value)";
+    } else {
+      if (options->infile.size()) {
+        std::cerr << "Expected only one input file, got '" << options->infile
+                  << "' and '" << argv[i] << "'" << std::endl;
+        exit(EXIT_FAILURE);
+      }
+      options->infile = argv[i];
+    }
+  }
+}
diff --git a/src/support/command-line.h b/src/support/command-line.h
new file mode 100644
index 000000000..f57929b6b
--- /dev/null
+++ b/src/support/command-line.h
@@ -0,0 +1,43 @@
+/*
+ * Copyright 2015 WebAssembly Community Group participants
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+//
+// Command line helpers.
+//
+
+#ifndef wasm_support_command_line_h
+#define wasm_support_command_line_h
+
+#include "wasm.h"
+
+namespace wasm {
+
+struct Options {
+  // standard options
+  bool debug;
+  std::string infile;
+  std::string outfile;
+  // extra options
+  std::map<std::string, const char *> extra;
+  Options() : debug(false) {}
+};
+
+void processCommandLine(int argc, const char *argv[], Options *options,
+                        const char *help);
+
+}  // namespace wasm
+
+#endif // wasm_support_command_line_h