Syntax Analysis - 随笔分类 - cuishengli

Yacc用优先级和结合性解决冲突

摘要：上一章，我们演示了一个已经写好的文法，带有优先级和结合性的。本章内容为如何利用Yacc写优先级和结合性。和上一章一样新建一个F#语言的xUnit测试项目，并安装依赖的NuGet包。然后，我们先输入设计好的文法，此时我们还不知道是否需要解决优先级： lines : lines expr "\n" 阅读全文

posted @ 2021-02-04 16:33 cuishengli 阅读(873) 评论(0) 推荐(0) 编辑

Yacc使用优先级

摘要：本示例是龙书4.9.2的示例，见图4-59。和前一章一样，新建xUnit项目，用F#语言。起个名C4F59安装NuGet包： Install-Package FSharpCompiler.Yacc Install-Package FSharpCompiler.Parsing Install-Pac 阅读全文

posted @ 2021-02-04 16:32 cuishengli 阅读(1324) 评论(0) 推荐(0) 编辑

FSharpCompiler.Yacc 入门示例

摘要：本文向大家推荐一个yacc语法自动构建器，FSharpCompiler.Yacc和FSharpCompiler.Parsing前者是解析器生成工具，后者是解析器的依赖项。顾名思义，这个编译器是专门为F#语言使用的。这个文件位于https://github.com/xp44mm/FSharpCompi 阅读全文

posted @ 2021-02-02 17:29 cuishengli 阅读(209) 评论(0) 推荐(0) 编辑

4.2 Context-Free Grammars

摘要：4.2 Context-Free Grammars Grammars were introduced in Section 2.2 to systematically describe the syntax of programming language constructs like expressions and statements. Using a syntactic variable ... 阅读全文

posted @ 2015-09-10 16:51 cuishengli 阅读(701) 评论(0) 推荐(0) 编辑

Chapter 4 Syntax Analysis

摘要：Chapter 4 Syntax Analysis This chapter is devoted to parsing methods that are typically used in compilers. We first present the basic concepts, then techniques suitable for hand implementation, and fi... 阅读全文

posted @ 2015-09-10 16:49 cuishengli 阅读(296) 评论(0) 推荐(0) 编辑

4.4 Top-Down Parsing

摘要：4.4 Top-Down Parsing Top-down parsing can be viewed as the problem of constructing a parse tree for the input string, starting from the root and creating the nodes of the parse tree in preorder (dept... 阅读全文

posted @ 2015-09-08 16:24 cuishengli 阅读(1374) 评论(0) 推荐(0) 编辑

4.3 Writing a Grammar

摘要：4.3 Writing a Grammar Grammars are capable of describing most, but not all, of the syntax of programming languages. For instance, the requirement that identifiers be declared before they are used, ca... 阅读全文

posted @ 2015-09-08 16:20 cuishengli 阅读(725) 评论(0) 推荐(0) 编辑

4.2 Context-Free Grammars

摘要：4.2 Context-Free GrammarsGrammars were introduced in Section 2.2 to systematically describe the syntax of programming language constructs like express... 阅读全文

posted @ 2015-09-08 16:19 cuishengli 阅读(377) 评论(0) 推荐(0) 编辑

Chapter 4 Syntax Analysis

摘要：Chapter 4 Syntax AnalysisThis chapter is devoted to parsing methods that are typically used in compilers.We first present the basic concepts, then tec... 阅读全文

posted @ 2015-09-08 16:16 cuishengli 阅读(670) 评论(0) 推荐(0) 编辑

4.8 Using Ambiguous Grammars

摘要：4.8 Using Ambiguous GrammarsIt is a fact that every ambiguous grammar fails to be LR and thus is not in any of the classes of grammars discussed in th... 阅读全文

posted @ 2015-09-06 14:35 cuishengli 阅读(525) 评论(0) 推荐(0) 编辑

4.7.6 Compaction of LR Parsing Tables

摘要：4.7.6 Compaction of LR Parsing TablesA typical programming language grammar with 50 to 100 terminals and 100 productions may have an LALR parsing tabl... 阅读全文

posted @ 2015-09-05 21:29 cuishengli 阅读(882) 评论(0) 推荐(0) 编辑

4.7.5 Efficient Construction of LALR Parsing Tables

摘要：4.7.5 Efficient Construction of LALR Parsing TablesThere are several modifications we can make to Algorithm 4.59 to avoid constructing the full collec... 阅读全文

posted @ 2015-09-05 14:06 cuishengli 阅读(1684) 评论(0) 推荐(0) 编辑

4.7.4 Constructing LALR Parsing Tables

摘要：4.7.4 Constructing LALR Parsing TablesWe now introduce our last parser construction method, the LALR (lookahead-LR) technique. This method is often us... 阅读全文

posted @ 2015-09-04 20:04 cuishengli 阅读(482) 评论(0) 推荐(0) 编辑

4.7.3 Canonical LR(1) Parsing Tables

摘要：4.7.3 Canonical LR(1) Parsing TablesWe now give the rules for constructing the LR(1) ACTION and GOTO functions from the sets of LR(1) items. These fun... 阅读全文

posted @ 2015-09-04 12:52 cuishengli 阅读(342) 评论(0) 推荐(0) 编辑

Lexer and parser generators (ocamllex, ocamlyacc)

摘要：Chapter 12 Lexer and parser generators (ocamllex, ocamlyacc) This chapter describes two program generators: ocamllex, that produces a lexical analyzer from a set of regular expressions with associate... 阅读全文

posted @ 2013-09-29 17:52 cuishengli 阅读(843) 评论(1) 推荐(0) 编辑

4.9 Parser Generators

摘要：4.9 Parser GeneratorsThis section shows how a parser generator can be used to facilitate the construction of the front end of a compiler. We shall use... 阅读全文

posted @ 2013-09-28 18:14 cuishengli 阅读(674) 评论(0) 推荐(0) 编辑

3.5 The Lexical-Analyzer Generator Lex

摘要：3.5 The Lexical-Analyzer Generator LexIn this section, we introduce a tool called Lex, or in a more recent implementation Flex, that allows one to spe... 阅读全文

posted @ 2013-09-28 11:53 cuishengli 阅读(1304) 评论(0) 推荐(0) 编辑

4.7 More Powerful LR Parsers

摘要：4.7 More Powerful LR ParsersIn this section, we shall extend the previous LR parsing techniques to use one symbol of lookahead on the input. There are... 阅读全文

posted @ 2012-09-24 16:41 cuishengli 阅读(402) 评论(0) 推荐(0) 编辑

4.6.5 Viable Prefixes

摘要：4.6.5 Viable PrefixesWhy can LR(0) automata be used to make shift-reduce decisions? The LR(0) automaton for a grammar characterizes the strings of gra... 阅读全文

posted @ 2012-09-24 14:39 cuishengli 阅读(1259) 评论(0) 推荐(0) 编辑

4.6.4 Constructing SLR-Parsing Tables

摘要：4.6.4 Constructing SLR-Parsing TablesThe SLR method for constructing parsing tables is a good starting point for studying LR parsing. We shall refer t... 阅读全文

posted @ 2012-09-24 14:38 cuishengli 阅读(646) 评论(0) 推荐(0) 编辑

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