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Microsoft PowerPoint – lec10.pptx Top-Down Parsing Copyright By PowCoder代写 加微信 powcoder Parsing: Review of the Big Picture (1) • Context-free grammars (CFGs) • Generation: • Recognition: Given , is • Translation • Given , create a parse tree for • Given , create an AST for • The AST is passed to the next component […]
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//显示为∀ 的字符是：For all Theorem triang_closed: ∀n. sumTo n = n*(n+1)/2 Copyright By PowCoder代写 加微信 powcoder By induction on n. Case 0: ‘sumTo 0 = 0*(0+1)/2’ (can’t be bothered) Successor case: Assuming ‘sumTo n = n*(n+1)/2’ Show ‘sumTo(n+1) = (n+1)*((n+1)+1)/2’ ‘sumTo(n+1)’ = (by definition) ‘n + 1 + sumTo(n)’ = (by induction hypothesis) ‘n + 1
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Microsoft PowerPoint – lec11.pptx Building a Predictive Parser Copyright By PowCoder代写 加微信 powcoder I.e., How to build the parse table for a recursive-descent parser Last Time: Intro LL(1) Predictive Parser Predict the parse tree Parser structure – 1 token of lookahead – A stack tracking the current parse tree’s – Selector/parse table Necessary conditions –
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— Sum all the numbers from 0 to n sumTo :: Int -> Int sumTo 0 = 0 | n > 0 = n + sumTo(n-1) Copyright By PowCoder代写 加微信 powcoder | otherwise = error “Not a natural number.” — If we read this as an inductive definition, then — Nat is the (smallest) set
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/* What are the types in this program? — String[] — function,class are those types? Copyright By PowCoder代写 加微信 powcoder What is a type? — a format of data — something with values — constraints/rules on data — kind of data — a way for the bytes to be interpreted — a proof — a
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Defining syntax using CFGs – Defined context-free grammar Copyright By PowCoder代写 加微信 powcoder – CFGs for specifying a language’s syntax • Language membership • List grammars • Resolving ambiguity CFG Review • G = (N,Σ,P,S) • ⇒!means “derives in 1 or more steps” • CFG generates a string by applying productions until no non-terminals remain
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18/08/2021 CRICOS code 00025BCRICOS code 00025B Copyright By PowCoder代写 加微信 powcoder • Cloud Delivery Models • Cloud Deploy Models • Cloud-Enabling Technologies – Broadband Networks and Internet Architecture – Virtualisation Technology (VT) – Data Centre Technology – Web Technology – Multitenant Technology • Goals and Benefits • Risks and Challenges • Cloud-based Applications in the
Context-free grammars (CFGs) Copyright By PowCoder代写 加微信 powcoder – RegExp == DFA – Jlex: a tool for generating (Java code for) a lexer/scanner • Mainly a collection of 〈regexp, action〉 pairs – CFGs, the underlying abstraction for parsers – Java CUP: a tool for generating (Java code for) a parser • Mainly a collection of
24/08/2021 CRICOS code 00025BCRICOS code 00025B Copyright By PowCoder代写 加微信 powcoder • Mask restrictions continue – carrying masks, wearing masks, check-in QLD • GCP coupons redeem (check the latest announcement) • The next Student Consultative Committee meeting will be taking place next Wednesday, 25 August. • Students can join the mailing list by emailing The
Microsoft PowerPoint – lec9.pptx Bottom-Up Parsing (A First Step) Copyright By PowCoder代写 加微信 powcoder Cocke–Younger–Kasami (CYK) algorithm Chomsky Normal Form Showed how to use Java CUP for getting ASTs But we never saw HOW the parser works Dip our toe into parsing – Approaches to parsing – CFG transformations • Useless non-terminals • Chomsky Normal
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