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Questions - flex-lexer

How to run code on start of yylex and when token is matched in RE-flex

I was using RE-flex to generate a c++ Scanner for a project. I wanted to run code when a token is matched and I followed the Flex way of doing, but that ended up putting the code outside the function....
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ishaangupte

c++

bison

flex-lexer

lex

Votes: 0

Answers: 1

Latest Answer

Use the YY_USER_INIT macro to inject code that executes the first time yylex() is called. This is a flex macro supported by RE-flex In addition, RE-flex has a new code section %begin{ ... } specifical...
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Dr. Alex RE

Java Bison and Jflex error for redeclared/undeclared variables

I am making a compiler with Jflex and Bison. Jflex does the lexical analysis. Bison does the parsing. The lexical analysis (in a .l file) is perfect. Tokenizes the input, and passes the input to the ....
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Chronicle

parsing

bison

flex-lexer

lexer

jflex

Votes: 0

Answers: 1

Latest Answer

It's actually a lot simpler to add your own data to a Bison-generated Java parser than it is to a C parser (or even a C++ parser). Note that Bison's Java API does not have unions, mostly because Java ...
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rici

Attempt to add a custom rule to output which already has a custom rule

I am using cmake to compile a library using flex & bison and I have this error: CMake Error at /usr/share/cmake/Modules/FindBISON.cmake:279 (add_custom_command): Attempt to add a custom rule to ...
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SamHuffman

cmake

bison

flex-lexer

Votes: 0

Answers: 1

Latest Answer

You need to specify different output files for flex and bison targets. flex_target(lexer automaton_lexer.l ${CMAKE_CURRENT_BINARY_DIR}/lexer.c) bison_target(parser automaton_parser.y ${CMAKE_CURRENT_B...
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vre

How to use Jflex and Bison Together?

I am really struggling to use Jflex and Bison together. For example, here's some sample code: https://github.com/valecor95/bison-flex-jflex-examples/tree/master/Java/1_BalancedParentheses/BalPar1 You ...
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izash

parsing

bison

flex-lexer

lexer

jflex

Votes: 0

Answers: 1

Latest Answer

In BalPar.y line 15, right at the beginning of main, it instantiates a BalParLexer with System.in as its input stream. You could add a few lines of code to check for a command line argument and use it...
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rici

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