PDF-2beepUsagebeep(sound=1,expr=NULL)Argumentssoundcharacterstringornumber

Author : alexa-scheidler | Published Date : 2016-02-23

Indexbeep13beepr3beeprpackagebeepr34

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2beepUsagebeep(sound=1,expr=NULL)Argumentssoundcharacterstringornumber: Transcript

Indexbeep13beepr3beeprpackagebeepr34. Marktoberdorf Lectures. August 2015. Sumit Gulwani. . Domain-specific Languages. 1. Lecture 2. 2. PBE Architecture. Example-based specification. Search Algorithm. Challenge 1: . Ambiguous/under-specified . Parentheses. Show that the following balanced parentheses grammar is ambiguous (by finding two parse trees for some input sequence) and find unambiguous grammar for the same language.. . B ::= . . Assertion ::: true `6 ^task6=null^::: task6=null ^::: task6=null `16 ^[((notif.^(:::)) _(:notif.^(:::))] task6=null ^::: task6=null `27 ^(task=null)^::: false `16 `727 `28n true task6=null fa // Where things work very nicely for recursive descent!. statmt. . ::= . . . println. ( . stringConst. , . ident. ). . . |. . ident. = . expr. . |. . if ( . Let us use (context-free) . grammars. !. Context Free . Grammar for . a. n. b. n. S ::= .  . - a grammar rule. S ::= . a . S . b . - another grammar rule. Example of a derivation. S => . (published at ESEC/FSE’09). Yingfei Xiong. Ph.D., University of Tokyo. Will be a postdoc@Univ. Waterloo since Dec. Joint work with. Zhenjiang Hu, Haiyan Zhao, Hui Song, . Masato Takeichi, and Hong Mei. Armando Solar-Lezama. Synthesis: 1980s view. Complete Formal Specification. Synthesis: modern view. . . Space of programs. . Reference Implementation. Test Harnesses. Input/Output. Examples. . What does it mean?. Notes from Robert Sebesta Programming Languages. Syntax. Rules for the language. In English some syntax rules are:. Sentence starts with capital letter. Sentence ends with ‘.’, ‘?’, ‘!’. JavaCUP (Construct Useful Parser) is a parser generator. Produce a parser written in java, itself is also written in Java;. There are many parser generators. . YACC (Yet Another Compiler-Compiler) for C programming language (dragon book chapter 4.9); . Parsing Arbitrary Grammars. Parsing using CYK Algorithm. 1) Transform any grammar to Chomsky Form, . in this order. , to ensure:. terminals t occur . alone on . the right-hand side: X:=t. no unproductive non-terminals symbols. Application Link:. bit.ly/hab18. CSCI0170. Lecture recorded; see course website.. Today’s topics. The Racket REPL. BNF for Racket (so far). Semantics: the rules of processing (so far). Definitions. Yingfei . Xiong. University of Tokyo, Japan. Zhenjiang Hu. National Institute of Informatics, Japa. n. Haiyan. Zhao. Peking University,. China. Hui. Song. Peking University,. China. Masato Takeichi. An AST. When do we want it?. Now!. 2. This Time. A little review of ASTs. The philosophy and use of a . Parser Generator. 3. Translating Lists. 4. CFG. IdList. -> . id. | . IdList. . comma. egl-17mid L4late L4young adultold adultmid L4late L4young adultold adultmid L4late L4young adultold adultmid L4late L4young adultold adultmid L4late L4young adultold adultmid L4late L4young adultold a

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