Added string conversion and expected library.

src/faust-lib/common/meson.build

@@ -1,5 +1,5 @@
-faust_core_header = files('application.h', 'core.h', 'string.h', 'vector.h')
-faust_core_src = files('application.cpp')
+faust_core_header = files('application.h', 'core.h', 'string.h', 'vector.h', 'stringConvert.h')
+faust_core_src = files('application.cpp', 'stringConvert.cpp')
 
 core_lib = static_library(
   'faust-core', 

src/faust-lib/common/stringConvert.cpp

@@ -0,0 +1,46 @@
+#include "faust-lib/common/stringConvert.h"
+
+tl::expected<faust::u64, faust::convert::eConversionError> faust::convert::hexToNum(const faust::String &str) {
+  faust::u64 result = 0;
+  for (faust::u64 i = 0; i < static_cast<faust::u64>(str.length()); ++i) {
+    result *= 16;
+    if (str[i] >= u'0' && str[i] <= u'9') {
+      result += str[i] - u'0';
+    } else if (str[i] >= u'A' && str[i] <= u'F') {
+      result += str[i] - u'A' + 10;
+    } else if (str[i] >= u'a' && str[i] <= u'f') {
+      result += str[i] - u'a' + 10;
+    } else {
+      return tl::unexpected(eConversionError::INVALID_CHARACTER);
+    }
+  }
+  return result;
+}
+
+tl::expected<faust::u64, faust::convert::eConversionError> faust::convert::decToNum(const faust::String &str) {
+  faust::u64 result = 0;
+  for (faust::u64 i = 0; i < static_cast<faust::u64>(str.length()); ++i) {
+    result *= 10;
+    if (str[i] >= u'0' && str[i] <= u'9') {
+      result += str[i] - u'0';
+    } else {
+      return tl::unexpected(eConversionError::INVALID_CHARACTER);
+    }
+  }
+  return result;
+}
+
+tl::expected<faust::u64, faust::convert::eConversionError> faust::convert::binToNum(const faust::String &str) {
+  faust::u64 result = 0;
+  for (faust::u64 i = 0; i < static_cast<faust::u64>(str.length()); ++i) {
+    result *= 2;
+    if (str[i] == u'0') {
+      result += 0;
+    } else if (str[i] == u'1') {
+      result += 1;
+    } else {
+      return tl::unexpected(eConversionError::INVALID_CHARACTER);
+    }
+  }
+  return result;
+}

src/faust-lib/common/stringConvert.h

@@ -0,0 +1,22 @@
+#pragma once
+
+#include "faust-lib/common/core.h"
+#include "faust-lib/common/string.h"
+
+#include "external/include/tl/expected.hpp"
+
+namespace faust {
+
+namespace convert {
+
+enum class eConversionError : u32 { INVALID_CHARACTER };
+
+tl::expected<u64, eConversionError> hexToNum(const String &str);
+
+tl::expected<u64, eConversionError> decToNum(const String &str);
+
+tl::expected<u64, eConversionError> binToNum(const String &str);
+
+} // namespace convert
+
+} // namespace faust