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