Parsing Algorithms in Compiler Design

Recursive descent parsing demonstrates a top-down parser starting from the starting symbol, deriving input by substituting productions, and highlights backtracking, left recursion, and shift to predictive parsing with a table.

Eliminate left recursion and left factoring in grammars to support parsing via recursive descent, introducing new variables (beta, e dash) and epsilon substitutions.

Compute the first of a variable by examining grammar productions, including the first terminal or epsilon, after eliminating left recursion, to guide predictive parsing.

Explore first and follow sets for grammar variables, apply rules with beta and first(beta), exclude epsilon, and propagate follow from A to B for predictive parsing.

Construct a predictive parser by eliminating left recursion and factoring, derive first and follow sets, build a predictive parsing table, and parse inputs using left to right, leftmost derivation.

Examine a predictive parser construction with an if-then-else grammar, covering left recursion check, left factoring elimination, first and follow sets, and non ll(1) cases.

Explain how a non recursive predictive parser uses leftmost derivation and left-to-right input scanning, guided by a predictive table, a stack, and an input buffer.

Explore operator precedence parsing, a bottom-up technique for operator grammars, and learn to eliminate epsilon reductions and adjacent variables while deriving leading and trailing sets.

Construct an operator precedence table by deriving the leading and trailing of grammar variables and applying rules to assign lesser, greater, and equal precedence among terminals.

Explore operator precedence parsing: construct the precedence table from leading and trailing variables, then parse an input using push, pop, and reduce actions with a dollar end-marker.

Understand bottom up parsing as the reverse of top down parsing, using handle pruning and reductions to reach the starting symbol with shift-reduce parsing and LR variants.

Discover how a shift reduce parser, a bottom up parser using a stack and a dollar symbol, shifts and reduces inputs, handles conflicts, and leads to LR parsing.

Examine how a simple lr parser (slr) uses shift, reduce, accept, and error actions to build a bottom-up parsing table from a grammar, with item sets, transitions, and an example.

This lecture presents an additional SLR parser example, building canonical sets and input sets, deriving transitions, computing follow sets, and constructing a shift-reduce parsing table with conflicts.

Explore how a simple LR/SLR parser processes input left-to-right with shift, reduce, and accept actions, using augmented grammar and a parsing table.

Master canonical lr parsing, a bottom-up method using shift, reduce, and go-to with lookahead to build the parsing table from an augmented grammar.

Construct a lalr parsing table by merging compatible states from the canonical lr table, and parse the input a d d $ with shift, reduce, and goto steps.

learn how CYK parsing tests membership of a string in a context-free grammar expressed in Chomsky normal form, using a bottom-up d_i_j table and starting symbol checks.

Explore early parsing, a top-down earley-style parser that handles all context-free grammars, including left factoring and ambiguity, using predict, scan, and complete operations to build parse trees.