Cup Error Handling Example
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XML Abstracting the syntax tree Generating a graphical syntax tree Generate code with XQuery This example is also found in the repository. MiniJava -
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this time with manual user actions This example is also found in powershell error handling example the repository. ANSI C - creating a parse tree for a context sensitive language This example is angularjs error handling example also found in the repository. The inevitable calculator This example should give You a basic idea of how to start working with CUP. A minimal CUP specification looks like
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this: /* Simple +/-/* expression language; parser evaluates constant expressions on the fly*/ import java_cup.runtime.*; parser code {: // Connect this parser to a scanner! scanner s; Parser(scanner s){ this.s=s; } :} /* define how to connect to the scanner! */ init with {: s.init(); :}; scan with {: return s.next_token(); :}; /* Terminals (tokens returned by the
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scanner). */ terminal SEMI, PLUS, MINUS, TIMES, UMINUS, LPAREN, RPAREN; terminal Integer NUMBER; // our scanner provides numbers as integers /* Non terminals */ non terminal expr_list; non terminal Integer expr; // used to store evaluated subexpressions /* Precedences */ precedence left PLUS, MINUS; precedence left TIMES; precedence left UMINUS; /* The grammar rules */ expr_list ::= expr_list expr:e SEMI {: System.out.println(e);:} | expr:e SEMI {: System.out.println(e);:} ; expr ::= expr:e1 PLUS expr:e2 {: RESULT = e1+e2; :} | expr:e1 MINUS expr:e2 {: RESULT = e1-e2; :} | expr:e1 TIMES expr:e2 {: RESULT = e1*e2; :} | MINUS expr:e {: RESULT = -e; :} %prec UMINUS | LPAREN expr:e RPAREN {: RESULT = e; :} | NUMBER:n {: RESULT = n; :} ; Based on this file, You just need to create a Java Specification from this with java -jar java-cup-11b.jar -interface -parser Parser calc.cup . Additionally, You need a basic scanner to produce tokens, which You then can process with your parser. For once, we show, how to handcode such a s
Contents i. About CUP Version 0.10 1. Introduction and Example 2. Specification Syntax 3. Running CUP 4. Customizing the Parser 5. Scanner interface 6. Error Recovery 7. Conclusion References A. Grammar for CUP resttemplate error handling example Specification Files B. A Very Simple Example Scanner C. Incompatibilites between CUP 0.9
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and CUP 0.10 D. Bugs E. Change log i. About CUP Version 0.10 Version 0.10 of CUP adds many new changes struts error handling example and features over the previous releases of version 0.9. These changes attempt to make CUP more like its predecessor, YACC. As a result, the old 0.9 parser specifications for CUP are not compatible and http://www2.cs.tum.edu/projekte/cup/examples.php a reading of appendix C of the new manual will be necessary to write new specifications. The new version, however, gives the user more power and options, making parser specifications easier to write. 1. Introduction and Example This manual describes the basic operation and use of the Java(tm) Based Constructor of Useful Parsers (CUP for short). CUP is a system for generating LALR parsers from simple specifications. It serves http://www.cs.princeton.edu/~appel/modern/java/CUP/manual.html the same role as the widely used program YACC [1] and in fact offers most of the features of YACC. However, CUP is written in Java, uses specifications including embedded Java code, and produces parsers which are implemented in Java. Although this manual covers all aspects of the CUP system, it is relatively brief, and assumes you have at least a little bit of knowledge of LR parsing. A working knowledge of YACC is also very helpful in understanding how CUP specifications work. A number of compiler construction textbooks (such as [2,3]) cover this material, and discuss the YACC system (which is quite similar to this one) as a specific example. Using CUP involves creating a simple specification based on the grammar for which a parser is needed, along with construction of a scanner capable of breaking characters up into meaningful tokens (such as keywords, numbers, and special symbols). As a simple example, consider a system for evaluating simple arithmetic expressions over integers. This system would read expressions from standard input (each terminated with a semicolon), evaluate them, and print the result on standard output. A grammar for the input to such a system might look like: expr_list ::= expr_list expr_part | expr_part expr
Support Search GitHub This repository Watch 76 Star 940 Fork 108 sirthias/parboiled Code Issues 24 Pull requests 1 Projects 0 Wiki Pulse Graphs Parse https://github.com/sirthias/parboiled/wiki/Parse-Error-Handling Error Handling Mathias edited this page Jan 26, 2011 · 4 revisions Pages 42 Home Abc grammar Action Variables AST Construction Building parboiled Calculators Features Grammar and Parser Debugging Handling Whitespace Indentation Based Grammars Installation Java Examples Java Parser JSON Parser Markdown processor Motivation parboiled for Java parboiled for Scala Parse Error Handling Parser Action Expressions Parser Actions in Scala Parser error handling Extension in Detail Parser Testing in Scala Parsing Performance Tuning Patch Policy Projects using parboiled RegEx vs. parboiled vs. Parser Generators Rule Construction in Java Rule Construction in Scala Scala Examples Simple Calculator Simple Java Example Simple Scala Example Style Guide The Big Picture The Parse Tree The ProfilingParseRunner The Rule Tree The Value Stack Thread Safety Time Parser Working with the error handling example Value Stack Show 27 more pages… Content Introduction ... Motivation ... Features ... Simple Java Example ... Simple Scala Example ... RegEx vs. parboiled vs. Parser Generators ... Projects using parboiled Installation Concepts ... The Big Picture ... The Rule Tree ... The Value Stack ... The Parse Tree ... AST Construction ... Parse Error Handling parboiled for Java ... Rule Construction in Java ... Parser Action Expressions ... Working with the Value Stack ... Action Variables ... Parser Extension in Detail ... Style Guide ... Java Examples ...... ABC Grammar ...... Calculators ...... Time Parser ...... Java Parser ...... Markdown processor parboiled for Scala ... Rule Construction in Scala ... Parser Actions in Scala ... Parser Testing in Scala ... Scala Examples ...... Simple Calculator ...... JSON Parser Advanced Topics ... Handling Whitespace ... Parsing Performance Tuning ... Indentation Based Grammars ... The ProfilingParseRunner ... Grammar and Parser Debugging ... Thread Safety Building parboiled parboiled-core Javadoc API parboiled-java Javadoc API parboiled-scala Scaladoc API Change Log Patch Policy Clone this wiki locally Clone in Desktop The proper handling of illegal input (with regard
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