| #include "ContextParameters.h" |
| #include "../legacy/Parameter.h" |
|
|
| namespace Moses2 |
| { |
|
|
| ContextParameters:: |
| ContextParameters() |
| : look_ahead(0), look_back(0) |
| { } |
|
|
| bool |
| ContextParameters:: |
| init(Parameter const& params) |
| { |
| look_back = look_ahead = 0; |
| params.SetParameter(context_string, "context-string", std::string("")); |
| std::string context_window; |
| params.SetParameter(context_window, "context-window", std::string("")); |
|
|
| if (context_window == "") |
| return true; |
|
|
| if (context_window.substr(0,3) == "all") { |
| look_back = look_ahead = std::numeric_limits<size_t>::max(); |
| return true; |
| } |
|
|
| size_t p = context_window.find_first_of("0123456789"); |
| if (p == 0) |
| look_back = look_ahead = atoi(context_window.c_str()); |
|
|
| if (p == 1) { |
| if (context_window[0] == '-') |
| look_back = atoi(context_window.substr(1).c_str()); |
| else if (context_window[0] == '+') |
| look_ahead = atoi(context_window.substr(1).c_str()); |
| else |
| UTIL_THROW2("Invalid specification of context window."); |
| } |
|
|
| if (p == 2) { |
| if (context_window.substr(0,2) == "+-" || |
| context_window.substr(0,2) == "-+") |
| look_back = look_ahead = atoi(context_window.substr(p).c_str()); |
| else |
| UTIL_THROW2("Invalid specification of context window."); |
| } |
| return true; |
| } |
| } |
|
|
