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StateMachine.cpp
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StateMachine.cpp
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#include "StateMachine.h"
StateMachine::StateMachine()
{
currentState = START_STATE;
for (int i = 0; i < LAST_STATE; i++)
for (int j = 0; j < LAST_CHAR; j++)
this->legalMoves[i][j] = CANTMOVE_STATE;
this->legalMoves[START_STATE][DIGIT_CHAR] = INTEGER_STATE;
this->legalMoves[START_STATE][LETTER_CHAR] = IDENTIFIER_STATE;
this->legalMoves[START_STATE][WHITESPACE_CHAR] = START_STATE;
this->legalMoves[START_STATE][NEWLINE_CHAR] = START_STATE;
this->legalMoves[START_STATE][LEFT_PAREN_CHAR] = LEFT_PAREN_STATE;
this->legalMoves[START_STATE][RIGHT_PAREN_CHAR] = RIGHT_PAREN_STATE;
this->legalMoves[START_STATE][LEFT_BRACE_CHAR] = LEFT_BRACE_STATE;
this->legalMoves[START_STATE][RIGHT_BRACE_CHAR] = RIGHT_BRACE_STATE;
this->legalMoves[START_STATE][EQUALS_CHAR] = ASSIGNMENT_STATE;
this->legalMoves[ASSIGNMENT_STATE][EQUALS_CHAR] = EQUALITY_STATE;
this->legalMoves[START_STATE][PLUS_CHAR] = PLUS_STATE;
this->legalMoves[PLUS_STATE][EQUALS_CHAR] = PLUS_EQUALS_STATE;
this->legalMoves[START_STATE][MINUS_CHAR] = MINUS_STATE;
this->legalMoves[MINUS_STATE][EQUALS_CHAR] = MINUS_EQUALS_STATE;
this->legalMoves[START_STATE][FORWARD_SLASH_CHAR] = DIVIDE_STATE;
this->legalMoves[START_STATE][AND_CHAR] = BITWISE_AND_STATE;
this->legalMoves[BITWISE_AND_STATE][AND_CHAR] = AND_STATE;
this->legalMoves[START_STATE][OR_CHAR] = BITWISE_OR_STATE;
this->legalMoves[BITWISE_OR_STATE][OR_CHAR] = OR_STATE;
// line comments
this->legalMoves[DIVIDE_STATE][FORWARD_SLASH_CHAR] = LINE_COMMENT_STATE;
for (int s = 0; s < LAST_CHAR; s++)
this->legalMoves[LINE_COMMENT_STATE][s] = LINE_COMMENT_STATE;
this->legalMoves[LINE_COMMENT_STATE][NEWLINE_CHAR] = START_STATE;
// block comments
this->legalMoves[DIVIDE_STATE][STAR_CHAR] = BLOCK_COMMENT_STATE;
for (int s = 0; s < LAST_CHAR; s++)
{
this->legalMoves[BLOCK_COMMENT_STATE][s] = BLOCK_COMMENT_STATE;
}
this->legalMoves[BLOCK_COMMENT_STATE][STAR_CHAR] = BLOCK_COMMENT_ENDING_STATE;
for (int s = 0; s < LAST_CHAR; s++)
{
this->legalMoves[BLOCK_COMMENT_ENDING_STATE][s] = BLOCK_COMMENT_STATE;
}
this->legalMoves[BLOCK_COMMENT_ENDING_STATE][STAR_CHAR] = BLOCK_COMMENT_ENDING_STATE;
this->legalMoves[BLOCK_COMMENT_ENDING_STATE][FORWARD_SLASH_CHAR] = START_STATE;
this->legalMoves[START_STATE][STAR_CHAR] = MULTIPLY_STATE;
this->legalMoves[MULTIPLY_STATE][EQUALS_CHAR] = MULTIPLY_BY_STATE;
this->legalMoves[START_STATE][LESS_CHAR] = LESS_STATE;
this->legalMoves[LESS_STATE][EQUALS_CHAR] = LESS_EQUAL_STATE;
this->legalMoves[LESS_STATE][LESS_CHAR] = INSERTION_STATE;
this->legalMoves[START_STATE][GREATER_CHAR] = GREATER_STATE;
this->legalMoves[GREATER_STATE][EQUALS_CHAR] = GREATER_EQUAL_STATE;
this->legalMoves[GREATER_STATE][GREATER_CHAR] = EXTRACTION_STATE;
this->legalMoves[START_STATE][NOT_CHAR] = NOT_STATE;
this->legalMoves[NOT_STATE][EQUALS_CHAR] = NOT_EQUAL_STATE;
this->legalMoves[START_STATE][SEMICOLON_CHAR] = SEMICOLON_STATE;
this->legalMoves[INTEGER_STATE][DIGIT_CHAR] = INTEGER_STATE;
this->legalMoves[IDENTIFIER_STATE][DIGIT_CHAR] = IDENTIFIER_STATE;
this->legalMoves[IDENTIFIER_STATE][LETTER_CHAR] = IDENTIFIER_STATE;
this->legalMoves[START_STATE][ENDFILE_CHAR] = ENDFILE_STATE;
// first, initialize all states to correspond to the BAD token type.
// then, reset the end states to correspond to the correct token types.
for (int i = 0; i < LAST_STATE; i++)
{
this->correspondingTokenTypes[i] = BAD_TOKEN;
}
this->correspondingTokenTypes[IDENTIFIER_STATE] = IDENTIFIER_TOKEN;
this->correspondingTokenTypes[INTEGER_STATE] = INTEGER_TOKEN;
this->correspondingTokenTypes[SEMICOLON_STATE] = SEMICOLON_TOKEN;
this->correspondingTokenTypes[LEFT_PAREN_STATE] = LEFT_PAREN_TOKEN;
this->correspondingTokenTypes[RIGHT_PAREN_STATE] = RIGHT_PAREN_TOKEN;
this->correspondingTokenTypes[LEFT_BRACE_STATE] = LEFT_BRACE_TOKEN;
this->correspondingTokenTypes[RIGHT_BRACE_STATE] = RIGHT_BRACE_TOKEN;
this->correspondingTokenTypes[LESS_STATE] = LESS_TOKEN;
this->correspondingTokenTypes[LESS_EQUAL_STATE] = LESS_EQUAL_TOKEN;
this->correspondingTokenTypes[GREATER_STATE] = GREATER_TOKEN;
this->correspondingTokenTypes[GREATER_EQUAL_STATE] = GREATER_EQUAL_TOKEN;
this->correspondingTokenTypes[EQUALITY_STATE] = EQUAL_TOKEN;
this->correspondingTokenTypes[NOT_EQUAL_STATE] = NOT_EQUAL_TOKEN;
this->correspondingTokenTypes[NOT_STATE] = NOT_TOKEN;
this->correspondingTokenTypes[INSERTION_STATE] = INSERTION_TOKEN;
this->correspondingTokenTypes[EXTRACTION_STATE] = EXTRACTION_TOKEN;
this->correspondingTokenTypes[ASSIGNMENT_STATE] = ASSIGNMENT_TOKEN;
this->correspondingTokenTypes[PLUS_STATE] = PLUS_TOKEN;
this->correspondingTokenTypes[PLUS_EQUALS_STATE] = PLUS_EQUALS_TOKEN;
this->correspondingTokenTypes[MULTIPLY_BY_STATE] = MULTIPLY_BY_TOKEN;
this->correspondingTokenTypes[MINUS_STATE] = MINUS_TOKEN;
this->correspondingTokenTypes[MINUS_EQUALS_STATE] = MINUS_EQUALS_TOKEN;
this->correspondingTokenTypes[MULTIPLY_STATE] = MULTIPLY_TOKEN;
this->correspondingTokenTypes[DIVIDE_STATE] = DIVIDE_TOKEN;
this->correspondingTokenTypes[ENDFILE_STATE] = ENDFILE_TOKEN;
this->correspondingTokenTypes[BITWISE_AND_STATE] = BITWISE_AND_TOKEN;
this->correspondingTokenTypes[AND_STATE] = AND_TOKEN;
this->correspondingTokenTypes[OR_STATE] = OR_TOKEN;
}
MachineState StateMachine::UpdateState(char currentCharacter, TokenType &correspondingTokenType)
{
// convert the input character into an input character type
CharacterType charType = BAD_CHAR;
// decide what character type the input char is
if (isdigit(currentCharacter))
charType = DIGIT_CHAR;
else if (isalpha(currentCharacter))
charType = LETTER_CHAR;
else if (isblank(currentCharacter))
charType = WHITESPACE_CHAR;
else if (currentCharacter == '\n')
charType = NEWLINE_CHAR;
else if (currentCharacter == ';')
charType = SEMICOLON_CHAR;
else if (currentCharacter == '(')
charType = LEFT_PAREN_CHAR;
else if (currentCharacter == ')')
charType = RIGHT_PAREN_CHAR;
else if (currentCharacter == '{')
charType = LEFT_BRACE_CHAR;
else if (currentCharacter == '}')
charType = RIGHT_BRACE_CHAR;
else if (currentCharacter == '=')
charType = EQUALS_CHAR;
else if (currentCharacter == '+')
charType = PLUS_CHAR;
else if (currentCharacter == '-')
charType = MINUS_CHAR;
else if (currentCharacter == '*')
charType = STAR_CHAR;
else if (currentCharacter == '/')
charType = FORWARD_SLASH_CHAR;
else if (currentCharacter == '<')
charType = LESS_CHAR;
else if (currentCharacter == '>')
charType = GREATER_CHAR;
else if (currentCharacter == '|')
charType = OR_CHAR;
else if (currentCharacter == '&')
charType = AND_CHAR;
else if (currentCharacter == EOF)
charType = ENDFILE_CHAR;
// update current state and token
correspondingTokenType = this->correspondingTokenTypes[this->currentState];
this->currentState = this->legalMoves[this->currentState][charType];
return this->currentState;
}