3 Feb 2007 23:23:22 -0500

Related articles |
---|

Moving from LR(0) to LALR(1) snoyberg@gmail.com (2007-01-31) |

Re: Moving from LR(0) to LALR(1) lothar@informatik.unibw-muenchen.de (Lothar Schmitz) (2007-02-03) |

Re: Moving from LR(0) to LALR(1) momchil.velikov@gmail.com (Momchil Velikov) (2007-02-03) |

Re: Moving from LR(0) to LALR(1) satyakiran@gmail.com (satya) (2007-02-03) |

Re: Moving from LR(0) to LALR(1) 148f3wg02@sneakemail.com (Karsten Nyblad) (2007-02-04) |

Re: Moving from LR(0) to LALR(1) snoyberg@gmail.com (snoyberg) (2007-02-05) |

From: | "satya" <satyakiran@gmail.com> |

Newsgroups: | comp.compilers |

Date: | 3 Feb 2007 23:23:22 -0500 |

Organization: | Compilers Central |

References: | 07-01-083 |

Keywords: | LALR, parse |

Posted-Date: | 03 Feb 2007 23:23:22 EST |

*> I've been able to implement a program that generates action and GOTO*

*> tables for a given grammar using LR(0). However, I haven't been able*

*> to find any good documentation (read: something simple enough I can*

*> understand) on switching over to LALR(1). Since my main goal for*

*> writing this is parsing Java, getting it to use LALR(1) is a necesity*

*> (or at least some equivalently powered algorithm).*

*>*

*> Are there any good online resources to describe this transition?*

Well, I guess there is no 'standard way' of implementing LALR(1)

parsing algorithms in practice (of course, I am not taking about the

theoretical methods). GNU Bison is a free LALR(1) parser generator

(written in C) and so is SableCC (written in Java); I guess you can

start by studying one of these. I have tried a bit to understand Bison

code myself and found it is not that easy. However, I was able to

document the internals of the LALR(1) parser (in C) generated by GNU

Bison - http://cs.uic.edu/~spopuri/cparser.html . This article

compares the standard algorithms published in books with a real world

implementation.

Hope that helps.

satya.

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