This part is the most important part in the implementation process. The lexical analyzer has three important member variables and methods. The problem is to increase the compilation time, so the best way is to modify the ambiguity grammar to no ambiguity grammar. When the grammar itself has ambiguity, sometimes the problem can be solved by setting lookahead to k. It is better to use keyword case insensitivity when designing database SQL statements. Similar to the rightmost derivation) k means k terminal symbols for each lookahead. Javacc In Windows Software Components ThatĪmong them, the first L means to scan the input from left to right the second L means to perform the left-most derivation every time (in the process of deducing the syntax tree, the left-most non-terminal symbol in the sentence pattern is replaced every time as Terminator.
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