February 2022
Beginner to intermediate
572 pages
13h
English
Content preview from An Introduction to Formal Languages and Automata, 7th Edition
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16.3 LL(1) PARSING ALGORITHM
We present the following algorithm for LL(1) parsing that uses the LL(1) Parse Table and a stack to parse strings instead of using an npda. For this stack we do not use a stack start symbol, but instead assume this stack can determine whether it is empty or not. We first define several functions for the algorithm.
- push(w) pushes w on the stack. If w = x1x2 … xn, where xi is a symbol either from V or T, then xn is pushed on the stack first, and x1 is pushed on the stack last.
- top() returns a copy of the top symbol on the stack.
- pop() removes and returns the top symbol on the stack.
- get() returns the next lookahead symbol in the input string. If there is no such symbol, it returns the end of string marker $.
LL ...
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