diff options
Diffstat (limited to 'src/utils.cc')
-rw-r--r-- | src/utils.cc | 53 |
1 files changed, 28 insertions, 25 deletions
diff --git a/src/utils.cc b/src/utils.cc index 7457ae2..112bc20 100644 --- a/src/utils.cc +++ b/src/utils.cc @@ -5,26 +5,26 @@ namespace SimpleParser { -int8_t getPriority(char tmp) { +TokenType getTokenType(char tmp) { switch ( tmp ) { case '-': - return 10; + return TokenType::OPERATOR_PLUS; case '+': - return 10; + return TokenType::OPERATOR_MINUS; case '/': - return 20; + return TokenType::OPERATOR_DIVIDE; case '*': - return 20; + return TokenType::OPERATOR_MULTIPLY; case '^': - return 30; + return TokenType::OPERATOR_POWER; case '(': - return 90; + return TokenType::PARENTHESES_OPEN; case ')': - return 90; + return TokenType::PARENTHESES_CLOSE; case ',': - return -1; + return TokenType::VALUE_NUMBER; default: - return -1; + return TokenType::VALUE_NUMBER; } } @@ -32,31 +32,33 @@ std::vector<std::string> lexer(std::string term) { std::string tmp; std::string tmpNum; std::vector<std::string> output; + TokenType token; + TokenType lastToken; - int8_t priority = 0; - int8_t lastPriority = 0; - uint32_t level = 0; + uint32_t level = 0; for ( auto termIter = term.begin(); termIter != term.end(); termIter++ ) { - priority = getPriority(*termIter); + token = getTokenType(*termIter); - if ( priority == -1 || ( termIter == term.begin() && - priority == 10 ) ) { + if ( token == TokenType::VALUE_NUMBER || + ( token == TokenType::OPERATOR_MINUS && + termIter == term.begin() ) ) { if ( level > 0 ) { tmp += *termIter; } else { tmpNum += *termIter; } } else { - if ( lastPriority == -1 && level == 0 ) { + if ( lastToken == TokenType::VALUE_NUMBER && + level == 0 ) { output.push_back(tmpNum); tmpNum.clear(); } - switch ( *termIter ) { - case '(': { + switch ( token ) { + case TokenType::PARENTHESES_OPEN: { if ( level > 0 ) { tmp += *termIter; } @@ -65,7 +67,7 @@ std::vector<std::string> lexer(std::string term) { break; } - case ')': { + case TokenType::PARENTHESES_CLOSE: { level--; if ( level == 0 ) { @@ -92,20 +94,21 @@ std::vector<std::string> lexer(std::string term) { } } - lastPriority = priority; + lastToken = token; } - if ( lastPriority == -1 ) { + if ( lastToken == TokenType::VALUE_NUMBER ) { output.push_back(tmpNum); - } else if ( lastPriority != 90 ) { + } else if ( lastToken != TokenType::PARENTHESES_CLOSE ) { throw operator_exception(); } - if (level != 0) { + if ( level != 0 ) { throw parenthese_exception(); } - if ( lastPriority == 90 && output.size() == 1 ) { + if ( lastToken == TokenType::PARENTHESES_CLOSE && + output.size() == 1 ) { output = lexer(output[0]); } |