By М.Downes
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Extra info for Short Math Guide for Latex2e
Sample text
In the parser we define two new tokens, OP and CP for open and close parentheses, and add a rule to make a parenthesized expression a term: %token OP CP in the declaration section ... %% term: NUMBER | ABS term { $$ = $2 >= 0? $2 : - $2; } | OP exp CP { $$ = $2; } New rule ; Note the action code in the new rule assigns $2, the value of the expression in the parentheses, to $$. The scanner has two new rules to recognize the two new tokens and one new rule to ignore two slashes followed by arbitrary text.
Patterns are tagged with start state names in angle brackets to indicate in which state(s) the pattern is active. The %x marks IFILE as an exclusive start state, which means that when that state is active, only patterns specifically marked with the state can match. (There are also inclusive start states declared with %s, in which patterns not marked with any state can also match. ) In action code, the macro BEGIN switches to a different start state. Example 2-3 shows a code skeleton for a scanner that handles included files.
Note that it doesn’t call yyrestart() when it restores the prior buffer; if it did, it would lose any input that had already been read into the buffer. This is a fairly typical albeit somewhat simplistic example of code for handling include files. Although flex can handle a stack of input buffers using the routines yypush_buffer_state and yypop_buffer_state, I rarely find them to be useful since they don’t handle the other information invariably associated with the stacked files. § It returns the value YY_NULL, defined as 0, which a bison parser interprets as the end of input.
Short Math Guide for Latex2e by М.Downes
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