/ / Symbol is the class that will be placed on the Stack struct Symbol in Java

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/ / Symbol is the class that will be placed on the Stack struct Symbol
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char token; int theline;
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/ / Balance class interface: check for balanced symbols
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/ / CONSTRUCTION: with an istream object / / ******************PUBLIC OPERATIONS********************
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/ / int CheckBalance( ) //
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Print mismatches return number of errors
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class Balance
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public: Balance( istream int checkBalance ( private: Tokenizer tok; int errors;
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input
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tok( input
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errors( 0
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/ / Token source / / Mismatched openiclose symbol errors
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void checkMatch( const Symbol
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opSym, const Symbol
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clSp 1;
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Class interface for a balanced-symbol program
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to ch,and updates currentLine if a newline is encountered It returns false only if the end of the file has been reached The complementary procedure putBackChar puts the current character, ch,back onto the input stream, and decrements currentLine if the character is a newline Clearly, putBackChar should be called at most once between calls to nextchar;as it is a private routine, we do not worry about abuse on the part of the class user Putting characters back onto the input stream is a commonly used technique in parsing In many instances we have read one too many characters, and undoing the read is useful In our case this occurs after processing a / We must determine whether the next character begins the comment start token; if it does not, we cannot simply disregard it because it could be an opening or closing symbol or a quote Thus we pretend that it is never read
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nextchar sets ch based on the next character in inputstream and adjusts currentLine if necessary It returns the result of get putBackChar puts the character back onto inputstream Both routines adjust currentLine if necessary boo1 Tokenizer::nextChar( ) i if ( !inputStreamget(ch ) ) return false; if( ch = = ' \ n ' ) currentline++; return true;
// // // // //
void Tokenizer::putBackChar( ) i inputStreamputback( ch ) ; if ( ch == \ n ' ) currentline--;
The nextchar routine for reading the next character, updating currentLine if necessary, and returning true if not at the end of file; and the putBackChar routine for putting back ch and updating currentLine if necessary
The state machine is a common technique used to parse symbols; at any pointy it is in some state, and each input character takes it to a new state Eventually, the state machine reaches a state in which a svmbol has been recognized
Next is the routine skipcomment,shown in Figure 125 Its purpose is to skip over the characters in the comment and position the input stream so that the next read is the first character after the comment ends This technique is complicated by the fact that comments can either begin with / / , in which case the line ends the comment, or / *, in which case * / ends the comment] In the / / case, we continually get the next character until either the end of file is reached (in which case the first half of the && operator fails) or we get a newline At that point we return Note that the line number is updated automatically by nextchar Otherwise, we have the / * case, which is processed starting at line 15 The skipcomment routine uses a simplified state machine The state machine is a common technique used to parse symbols; at any point, it is in some state, and each input character takes it to a new state Eventually, it reaches a state at which a symbol has been recognized In skipcomment,at any point, it has matched 0, 1 , or 2 characters of the * / terminator, corresponding to states 0, 1, and 2 If it matches two characters, it can return Thus, inside the loop, it can be in only state 0 or 1 because, if it is in state 1 and sees a /, it returns immediately Thus the state
I We do not consider deviant cases involving \