Add internal strings

CMakeLists.txt

@@ -91,6 +91,7 @@ endif()
 
 set(MYNTEYE_SRCS
   ${UVC_SRC}
+  src/internal/strings.cc
   src/internal/types.cc
   src/public/types.cc
   src/device/context.cc

src/device/context.cc

@@ -15,10 +15,15 @@ Context::Context() : context_(uvc::create_context()) {
     auto vid = uvc::get_vendor_id(*device);
     auto pid = uvc::get_product_id(*device);
     // auto video_name = uvc::get_video_name(*device);
-    LOG(INFO) << "name: " << name << ", vid: 0x" << std::hex << vid
-              << ", pid: 0x" << std::hex << pid;
+    LOG(INFO) << "UVC device detected, name: " << name << ", vid: 0x"
+              << std::hex << vid << ", pid: 0x" << std::hex << pid;
     if (vid == MYNTEYE_VID) {
-      devices_.push_back(Device::Create(name, device));
+      auto d = Device::Create(name, device);
+      if (d) {
+        devices_.push_back(d);
+      } else {
+        LOG(ERROR) << "Device is not supported by MYNT EYE.";
+      }
     }
   }
 }

src/device/device.cc

@@ -2,6 +2,7 @@
 
 #include <glog/logging.h>
 
+#include "internal/strings.h"
 #include "uvc/uvc.h"
 
 MYNTEYE_BEGIN_NAMESPACE
@@ -16,6 +17,10 @@ Device::~Device() {
 
 std::shared_ptr<Device> Device::Create(
     const std::string &name, std::shared_ptr<uvc::device> device) {
+  if (name == "MYNTEYE") {
+  } else if (strings::starts_with(name, "MYNT-EYE-")) {
+    // TODO(JohnZhao): Create different device by name, such as MYNT-EYE-S1000
+  }
   return nullptr;
 }
 

src/internal/strings.cc

@@ -0,0 +1,92 @@
+#include "internal/strings.h"
+
+#include <algorithm>
+#include <cctype>
+#include <exception>
+#include <locale>
+
+MYNTEYE_BEGIN_NAMESPACE
+
+namespace strings {
+
+namespace {
+
+// The most elegant way to iterate the words of a string
+//   https://stackoverflow.com/questions/236129/the-most-elegant-way-to-iterate-the-words-of-a-string
+
+template <class ContainerT>
+void tokenize(
+    const std::string &str, ContainerT &tokens,  // NOLINT
+    const std::string &delimiters = " ", bool trimEmpty = false) {
+  std::string::size_type pos, lastPos = 0, length = str.length();
+
+  using value_type = typename ContainerT::value_type;
+  using size_type = typename ContainerT::size_type;
+
+  while (lastPos < length + 1) {
+    pos = str.find_first_of(delimiters, lastPos);
+    if (pos == std::string::npos) {
+      pos = length;
+    }
+
+    if (pos != lastPos || !trimEmpty) {
+      tokens.push_back(
+          value_type(str.data() + lastPos, (size_type)pos - lastPos));
+    }
+
+    lastPos = pos + 1;
+  }
+}
+
+}  // namespace
+
+int hex2int(const std::string &text) {
+  try {
+    return std::stoi(text, nullptr, 16);
+  } catch (const std::exception &e) {
+    throw new strings_error("strings conversion error");
+  }
+}
+
+bool starts_with(const std::string &text, const std::string &prefix) {
+  return text.compare(0, prefix.length(), prefix) == 0;
+}
+
+std::vector<std::string> split(
+    const std::string &text, const std::string &delimiters) {
+  std::vector<std::string> tokens;
+  tokenize(text, tokens, delimiters);
+  return tokens;
+}
+
+// What's the best way to trim std::string?
+//   https://stackoverflow.com/questions/216823/whats-the-best-way-to-trim-stdstring
+
+void ltrim(std::string &s) {  // NOLINT
+  s.erase(s.begin(), std::find_if(s.begin(), s.end(), [](int ch) {
+            return !std::isspace(ch);
+          }));
+}
+
+void rtrim(std::string &s) {  // NOLINT
+  s.erase(
+      std::find_if(
+          s.rbegin(), s.rend(), [](int ch) { return !std::isspace(ch); })
+          .base(),
+      s.end());
+}
+
+void trim(std::string &s) {  // NOLINT
+  ltrim(s);
+  rtrim(s);
+}
+
+std::string trim_copy(const std::string &text) {
+  std::string s = text;
+  trim(s);
+  return s;
+}
+
+}  // namespace strings
+
+MYNTEYE_END_NAMESPACE

src/internal/strings.h

@@ -0,0 +1,41 @@
+#ifndef MYNTEYE_INTERNAL_STRINGS_H_  // NOLINT
+#define MYNTEYE_INTERNAL_STRINGS_H_
+#pragma once
+
+#include <stdexcept>
+#include <string>
+#include <utility>
+#include <vector>
+
+#include "mynteye/mynteye.h"
+
+MYNTEYE_BEGIN_NAMESPACE
+
+class strings_error : public std::runtime_error {
+ public:
+  explicit strings_error(const std::string &what_arg) noexcept
+      : std::runtime_error(std::move(what_arg)) {}
+  explicit strings_error(const char *what_arg) noexcept
+      : std::runtime_error(std::move(what_arg)) {}
+};
+
+namespace strings {
+
+int hex2int(const std::string &text);
+
+bool starts_with(const std::string &text, const std::string &prefix);
+
+std::vector<std::string> split(
+    const std::string &text, const std::string &delimiters);
+
+void ltrim(std::string &s);  // NOLINT
+void rtrim(std::string &s);  // NOLINT
+void trim(std::string &s);   // NOLINT
+
+std::string trim_copy(const std::string &text);
+
+}  // namespace strings
+
+MYNTEYE_END_NAMESPACE
+
+#endif  // MYNTEYE_INTERNAL_STRINGS_H_ NOLINT