Function parseNumeric

lib/validator/component_name.cpp:167–180

Parses a non-negative integer without leading zeros. Returns the end position, or npos on failure.

// Parses a non-negative integer without leading zeros.
// Returns the end position, or npos on failure.
size_t parseNumeric(std::string_view V) {
  if (V.empty())
    return std::string_view::npos;
  if (V[0] == '0') {
    return 1;
  }
  if (V[0] >= '1' && V[0] <= '9') {
    size_t Pos = 1;
    while (Pos < V.size() && isdigit(V[Pos]))
      Pos++;
    return Pos;
  }
  return std::string_view::npos;
}

// canonversion ::= [1-9] [0-9]*
//                | '0.' [1-9] [0-9]*