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144 lines (122 loc) · 5.22 KB
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#include "StateMachine.h"
StateMachineClass::StateMachineClass()
: mCurrentState(START_STATE)
{
for(int i=0; i<LAST_STATE; i++)
{
for(int j=0; j<LAST_CHAR; j++)
{
mLegalMoves[i][j] = CANTMOVE_STATE;
}
}
mLegalMoves[START_STATE][DIGIT_CHAR]= INTEGER_STATE;
mLegalMoves[INTEGER_STATE][DIGIT_CHAR]= INTEGER_STATE;
mLegalMoves[START_STATE][LCURLY_CHAR]= LCURLY_STATE;
mLegalMoves[START_STATE][RCURLY_CHAR]= RCURLY_STATE;
mLegalMoves[START_STATE][RPAREN_CHAR]= RPAREN_STATE;
mLegalMoves[START_STATE][LPAREN_CHAR]= LPAREN_STATE;
mLegalMoves[START_STATE][ASSIGNMENT_CHAR]= ASSIGNMENT_STATE;
mLegalMoves[START_STATE][LETTER_CHAR]= IDENTIFIER_STATE;
mLegalMoves[START_STATE][UNDERSCORE_CHAR]= IDENTIFIER_STATE;
mLegalMoves[IDENTIFIER_STATE][LETTER_CHAR]= IDENTIFIER_STATE;
mLegalMoves[IDENTIFIER_STATE][DIGIT_CHAR]= IDENTIFIER_STATE;
mLegalMoves[IDENTIFIER_STATE][UNDERSCORE_CHAR]= IDENTIFIER_STATE;
mLegalMoves[START_STATE][PLUS_CHAR]= PLUS_STATE;
mLegalMoves[START_STATE][SEMICOLON_CHAR]= SEMICOLON_STATE;
mLegalMoves[START_STATE][ENDFILE_CHAR]= ENDFILE_STATE;
mLegalMoves[START_STATE][LESS_CHAR]= LESS_STATE;
mLegalMoves[LESS_STATE][LESS_CHAR]= INSERTION_STATE;
mLegalMoves[START_STATE][WHITESPACE_CHAR]= START_STATE;
mLegalMoves[START_STATE][DIVIDE_CHAR]= DIVIDE_STATE;
mLegalMoves[DIVIDE_STATE][TIMES_CHAR]= BLOCK1_STATE;
// BLOCK1_STATE self loop
mLegalMoves[BLOCK1_STATE][DIGIT_CHAR]= BLOCK1_STATE;
mLegalMoves[BLOCK1_STATE][LCURLY_CHAR]= BLOCK1_STATE;
mLegalMoves[BLOCK1_STATE][RCURLY_CHAR]= BLOCK1_STATE;
mLegalMoves[BLOCK1_STATE][RPAREN_CHAR]= BLOCK1_STATE;
mLegalMoves[BLOCK1_STATE][LPAREN_CHAR]= BLOCK1_STATE;
mLegalMoves[BLOCK1_STATE][ASSIGNMENT_CHAR]= BLOCK1_STATE;
mLegalMoves[BLOCK1_STATE][UNDERSCORE_CHAR]= BLOCK1_STATE;
mLegalMoves[BLOCK1_STATE][LETTER_CHAR]= BLOCK1_STATE;
mLegalMoves[BLOCK1_STATE][PLUS_CHAR]= BLOCK1_STATE;
mLegalMoves[BLOCK1_STATE][SEMICOLON_CHAR]= BLOCK1_STATE;
mLegalMoves[BLOCK1_STATE][LESS_CHAR]= BLOCK1_STATE;
mLegalMoves[BLOCK1_STATE][INSERTION_CHAR]= BLOCK1_STATE;
mLegalMoves[BLOCK1_STATE][WHITESPACE_CHAR]= BLOCK1_STATE;
mLegalMoves[BLOCK1_STATE][DIVIDE_CHAR]= BLOCK1_STATE;
//BLOCK1_STATE transition to BLOCK2_STATE
mLegalMoves[BLOCK1_STATE][TIMES_CHAR]= BLOCK2_STATE;
//BLOCK2_STATE self loop
mLegalMoves[BLOCK2_STATE][TIMES_CHAR]= BLOCK2_STATE;
// BLOCK2_STATE transition to BLOCK1_STATE
mLegalMoves[BLOCK2_STATE][DIGIT_CHAR]= BLOCK1_STATE;
mLegalMoves[BLOCK2_STATE][LCURLY_CHAR]= BLOCK1_STATE;
mLegalMoves[BLOCK2_STATE][RCURLY_CHAR]= BLOCK1_STATE;
mLegalMoves[BLOCK2_STATE][RPAREN_CHAR]= BLOCK1_STATE;
mLegalMoves[BLOCK2_STATE][LPAREN_CHAR]= BLOCK1_STATE;
mLegalMoves[BLOCK2_STATE][ASSIGNMENT_CHAR]= BLOCK1_STATE;
mLegalMoves[BLOCK2_STATE][UNDERSCORE_CHAR]= BLOCK1_STATE;
mLegalMoves[BLOCK2_STATE][LETTER_CHAR]= BLOCK1_STATE;
mLegalMoves[BLOCK2_STATE][PLUS_CHAR]= BLOCK1_STATE;
mLegalMoves[BLOCK2_STATE][SEMICOLON_CHAR]= BLOCK1_STATE;
mLegalMoves[BLOCK2_STATE][LESS_CHAR]= BLOCK1_STATE;
mLegalMoves[BLOCK2_STATE][INSERTION_CHAR]= BLOCK1_STATE;
mLegalMoves[BLOCK2_STATE][WHITESPACE_CHAR]= BLOCK1_STATE;
mLegalMoves[BLOCK2_STATE][DIVIDE_CHAR]= START_STATE;
mLegalMoves[BLOCK2_STATE][DIVIDE_CHAR]= START_STATE;
for(int i=0; i<LAST_STATE; i++)
{
mCorrespondingTokenTypes[i]=BAD_TOKEN;
}
mCorrespondingTokenTypes[IDENTIFIER_STATE] = IDENTIFIER_TOKEN;
mCorrespondingTokenTypes[INTEGER_STATE] = INTEGER_TOKEN;
mCorrespondingTokenTypes[LCURLY_STATE] = LCURLY_TOKEN;
mCorrespondingTokenTypes[RCURLY_STATE] = RCURLY_TOKEN;
mCorrespondingTokenTypes[RPAREN_STATE] = RPAREN_TOKEN;
mCorrespondingTokenTypes[LPAREN_STATE] = LPAREN_TOKEN;
mCorrespondingTokenTypes[ASSIGNMENT_STATE] = ASSIGNMENT_TOKEN;
mCorrespondingTokenTypes[PLUS_STATE] = PLUS_TOKEN;
mCorrespondingTokenTypes[SEMICOLON_STATE] = SEMICOLON_TOKEN;
mCorrespondingTokenTypes[ENDFILE_STATE] = ENDFILE_TOKEN;
mCorrespondingTokenTypes[LESS_STATE] = LESS_TOKEN;
mCorrespondingTokenTypes[INSERTION_STATE] = INSERTION_TOKEN;
mCorrespondingTokenTypes[DIVIDE_STATE] = DIVIDE_TOKEN;
mCorrespondingTokenTypes[TIMES_STATE] = TIMES_TOKEN;
}
MachineState StateMachineClass::UpdateState(char currentCharacter,
TokenType & correspondingTokenType)
{
// convert the input character into an input character type
CharacterType charType = BAD_CHAR;
if(isdigit(currentCharacter))
charType = DIGIT_CHAR;
if(isalpha(currentCharacter))
charType = LETTER_CHAR;
if(isspace(currentCharacter))
charType = WHITESPACE_CHAR;
if(currentCharacter=='+')
charType = PLUS_CHAR;
if(currentCharacter=='}')
charType = RCURLY_CHAR;
if(currentCharacter=='{')
charType = LCURLY_CHAR;
if(currentCharacter==')')
charType = RPAREN_CHAR;
if(currentCharacter=='(')
charType = LPAREN_CHAR;
if(currentCharacter=='=')
charType = ASSIGNMENT_CHAR;
if(currentCharacter==';')
charType = SEMICOLON_CHAR;
if(currentCharacter=='<')
charType = LESS_CHAR;
if(currentCharacter=='/')
charType = DIVIDE_CHAR;
if(currentCharacter=='*')
charType = TIMES_CHAR;
if(currentCharacter==EOF)
charType = ENDFILE_CHAR;
correspondingTokenType = mCorrespondingTokenTypes[mCurrentState];
mCurrentState = mLegalMoves[mCurrentState][charType];
return mCurrentState;
}