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In computer science, an LL parser (Left-to-right, leftmost derivation) is a top-down parser for a restricted context-free language.It parses the input from Left to right, performing Leftmost derivation of the sentence.
Yacc (Yet Another Compiler-Compiler) is a computer program for the Unix operating system developed by Stephen C. Johnson.It is a lookahead left-to-right rightmost derivation (LALR) parser generator, generating a LALR parser (the part of a compiler that tries to make syntactic sense of the source code) based on a formal grammar, written in a notation similar to Backus–Naur form (BNF). [1]
In computer science, a recursive descent parser is a kind of top-down parser built from a set of mutually recursive procedures (or a non-recursive equivalent) where each such procedure implements one of the nonterminals of the grammar.
An ε-free LL(1) grammar is also an SLR(1) grammar. An LL(1) grammar with symbols that have both empty and non-empty derivations is also an LALR(1) grammar. An LL(1) grammar with symbols that have only the empty derivation may or may not be LALR(1). [9] LL grammars cannot have rules containing left recursion. [10]
SID is an example of a parser which generates LL(1) and does not use a table. You can see an example of its generated code. Instead it calls functions for each state. Of course it could just as well have used a table to express a DAG and transition through states that way. I'm not sure if this is what you meant by "not table based". I hope that ...
The parser's program code is a simple generic loop that is the same for all grammars and languages. ... Bottom-up parse of 1+1. This example of LR parsing uses the ...
A canonical LR parser (also called a LR(1) parser) is a type of bottom-up parsing algorithm used in computer science to analyze and process programming languages. It is based on the LR parsing technique, which stands for "left-to-right, rightmost derivation in reverse."
In computer science, a left corner parser is a type of chart parser used for parsing context-free grammars.It combines the top-down and bottom-up approaches of parsing. The name derives from the use of the left corner of the grammar's production rules.