'Follow set' presentation slideshows

Week 6

590 views • 39 slides

Parsing

Parsing. Top-down v.s. Bottom-up Top-down parsing Recursive-descent parsing LL(1) parsing LL(1) parsing algorithm First and follow sets Constructing LL(1) parsing table Error recovery. Bottom-up parsing Shift-reduce parsers LR(0) parsing LR(0) items Finite automata of items

666 views • 34 slides

Table-driven parsing

Table-driven parsing. Parsing performed by a finite state machine, augmented by a stack . FSM driven by table (s) generated automatically from grammar. Language generator tables. Input. parser. stack. tables. Pushdown Automata.

235 views • 22 slides

WELCOME

WELCOME. Presentation slides can be downloaded from: http://www.rivervalleypri.moe.edu.sg. ENGLISH. Revised PSLE format Wef. 2005. Paper 1 (Writing). Assessment objectives Write effectively in internationally accepted English for different purposes, audiences and contexts

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How to construct an LL(1) parsing table ?

1.32k views • 16 slides

Top-Down parsing

Top-Down parsing. LL(1) parsing. Overview of Top-Down. There are only two actions Replace Match. Overview of Top-Down. e.g. with grammar. LL(k) parsing. L stands for left-to-right parse of input L stands for leftmost-derivation k stands for k-token look-ahead. LL(1) Parsing.

289 views • 16 slides

????? ???????? LR ??????

????? ???????? LR ??????. ???? ?????? http://vrl.sys.wakayama-u.ac.jp/~twada/syspro/. ????? LR(0) ??????????????. ???????????. ??. (1) <E> ?<E>+<B> (2) <E> ?<B> (3) <B> ?<B>*<T> (4) <B> ? <T> (5) <T> ? 0 (6) <T> ? 1. ??????. ?? 1 T ? 0 ?. ?? 5 E ?B ? B ?B ? *T. ??? B ?B* ? T

239 views • 15 slides

Bottom-up parsing

Bottom-up parsing. Synthesize tree from fragments Automaton performs two actions: shift : push next symbol on stack reduce : replace symbols on stack Automaton synthesizes ( reduces ) when end of a production is recognized

237 views • 10 slides

EMFText Meeting, Dresden, 30.11.2009

181 views • 9 slides

CS 442/542

CS 442/542. Parsing Part 2. Quiz 6 Problems and definitions. Definitions Regular Expression, NFA, DFA, CGF, First Set, Follow Set, First + Problems

161 views • 9 slides

Tutorial-4

Tutorial-4. LL(1) Parsing. First Sets. Recall that we construct the first sets using the following algorithm Algorithm : If t is a terminal First (t) = { t } If X is non-terminal, then ? ? First(X) If X ? ?

83 views • 8 slides