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/ / Precondition: We are about to process a comment; // have already seen comment start token / / Postcondition: Stream will be set immediately after /I' comment ending token void Tokenizer::skipComment( CommentType start i
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// ~ook for * / boo1 state = false;
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/ / Seen first char in comment ender
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1 errors++; cout << "Unterminated comment at line " << getLineNumber( ) < < endl;
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The skipcomment routine for moving past an already started comment
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can be represented by a Boolean variable that is true if the state machine is in state 1 If it does not return, it either goes back to state 1 if it encounters a * or goes back to state 0 if it does not This procedure is stated succinctly at line 21 If we never find the comment-ending token, eventually nextchar returns false and the while loop terminates, resulting in an error message The skipQuote method, shown in Figure 126, is similar Here, the parameter is the opening quote character, which is either " or In either case, we need to see that character as the closing quote However, we must be prepared to handle the \ character; otherwise, our program will report errors \vhen it is run on its own source Thus we repeatedly digest characters If the current character is a closing quote, we are done If it is a newline, we have an unterminated character or string constant And if it is a backslash, we digest an extra character without examining it Once we've written the skipping routine, writing getNextOpenClose is easier If the current character is a / , we read a second character to see
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/ / Precondition: We are about to process a quote; // have already seen beginning quote / / Postcondition: Stream will be set immediately after // matching quote
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5 void Tokenizer::skipQuote( char quoteType
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cout
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errors++; return;
/ / If a backslash, skip next character else if ( ch == ' \ \ I ) nextchar( ) ;
The skipQuote routine for moving past an already started character or string constant
whether we have a comment If so, we call skipcomment;if not, we undo the second read If we have a quote, we call skipQuoteIf we have an opening or closing symbol, we can return Otherwise, we keep reading until we eventually run out of input or find an opening or closing symbol The entire routine is shown in Figure 127 The getLineNumber and getErrorCount methods are one-liners that return the values of the corresponding data members and are not shown We discuss the getNextID routine in Section 1322 when it is needed In the Balance class, the balanced symbol algorithm requires that we place opening symbols on a stack In order to print diagnostics, we store a line number with each symbol, as shown previously in the symbol s truct at lines 6 to 10 in Figure 123 The checkBalance routine is implemented as shown in Figure 128 It follows the algorithm description almost verbatim A stack that stores pending opening symbols is declared at line 7 Opening symbols are pushed onto the stack with the current line number When a closing symbol is encountered and the stack is empty, the closing symbol is extraneous; otherwise, we remove the top item from the stack and verify that the opening symbol that was on the stack matches the closing symbol just read To do so we use the