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PARSING QUESTIONS

nom parsing a separate list
nom parsing a separate list
Does that help The problem is that nom always takes the first path it sees somewhat works (as in, it doesn't have to consume all input). So what you ideally want to do, is split the paths after the first "a-z" (or whatever), to one of two possible on
TAG : parsing
Date : January 11 2021, 11:39 AM , By : JoeCh
Best tools to parse reports
Best tools to parse reports
I hope this helps you . you can use Python as well. It has cleaner syntax and is easier to program with.
TAG : parsing
Date : January 10 2021, 01:49 PM , By : harley.holt
Nom 5: creating a combinator using another parser multiple times
Nom 5: creating a combinator using another parser multiple times
I hope this helps . Suppose I want to create a combinator which uses another parser multiple times, for example, to parse a string delimited by two kinds of quotes: , The simplest way would be to be explicit with the returned closure:
TAG : parsing
Date : January 02 2021, 06:48 AM , By : John Q.
Recursive parsing grammar consumes input and fails to parse sequence
Recursive parsing grammar consumes input and fails to parse sequence
should help you out The issue is that when you run the pRuleElement parser on the input, it correctly parses one string, leaving some unconsumed input, but then it fails later outside of the choice that would backtrack.You can run the pAlternates par
TAG : parsing
Date : January 02 2021, 06:48 AM , By : Pancilobak
Issue with parsing of Rascal DSL
Issue with parsing of Rascal DSL
should help you out I am unable to parse a language instance. , I changed
TAG : parsing
Date : January 02 2021, 06:48 AM , By : Grik
reading/parsing common lisp files from lisp without all packages available or loading everything
reading/parsing common lisp files from lisp without all packages available or loading everything
fixed the issue. Will look into that further I am almost sure there is no easy portable way to do this for a number of reasons.(Just limiting things to the non-existent-package problem for now.)
TAG : parsing
Date : January 02 2021, 06:48 AM , By : T11M
Parsing a website
Parsing a website
Any of those help Beautiful Soup (Python) comes highly recommended, though I have no experience with it personally.
TAG : parsing
Date : January 02 2021, 06:48 AM , By : boney M
Pattern matching for custom read function
Pattern matching for custom read function
Does that help This sounds like something better suited to a parser; Parsec is a powerful Haskell parser combinator library, which I would recommend.
TAG : parsing
Date : January 02 2021, 06:48 AM , By : Nathan Good
ANTLR grammar: parser- and lexer literals
ANTLR grammar: parser- and lexer literals
will be helpful for those in need In addition to Will's answer, it's best to define your lexer tokens explicitly (in your lexer grammar). In case you're mixing them in your parser grammar, it's not always clear in what order the tokens are tokenized
TAG : parsing
Date : January 02 2021, 06:48 AM , By : user183954
parsing issue with comma separated csv file
parsing issue with comma separated csv file
I wish this helpful for you Unless you have specific reasons for using awk, I would recommend using a CSV parsing library. Many scripting languages have one built-in (or at least available) and they'll save you from these headaches.
TAG : parsing
Date : January 02 2021, 06:48 AM , By : vitorcoliveira
Good grammar for date data type for recursive descent parser LL(1)
Good grammar for date data type for recursive descent parser LL(1)
I wish this helpful for you First off, I'm a fan of LL parsers, so I approve of your approach heartily. Note that one of the newer popular parser generators (ANTLR) is LL. If you allow more look-ahead, rather that restricting yourself to LL(1), you c
TAG : parsing
Date : January 02 2021, 06:48 AM , By : gcomstock
How do Scala parser combinators compare to Haskell's Parsec?
How do Scala parser combinators compare to Haskell's Parsec?
Does that help I have read that Haskell parser combinators (in Parsec) can parse context sensitive grammars. Is this also true for Scala parser combinators? If so, is this what the "into" (aka ">>") function is for? , You have many questions!
TAG : parsing
Date : January 02 2021, 06:48 AM , By : barefootChild
Examples of attoparsec in parsing binary file formats?
Examples of attoparsec in parsing binary file formats?
hope this fix your issue There are few or no examples of attoparsec for parsing binary formats, as parsec-style combinator parsing is mostly for text formats, not binary formats (though there's no good reason for this).For straight binary parsing, se
TAG : parsing
Date : January 02 2021, 06:48 AM , By : Icyflash
How to decode GSM-TCAP messages using asn1c generated code
How to decode GSM-TCAP messages using asn1c generated code
Any of those help I am using the c code generated by asn1c from the TCAP protocol specification (i.e., the corresponding ASN1 files). I can successfully encode TCAP packets by the generated code. However, trying to "decode" related byte streams fails
TAG : parsing
Date : January 02 2021, 05:18 AM , By : user134570
How do I fix this parsing conflict?
How do I fix this parsing conflict?
wish of those help Lemon implements precedence rules in a way that is similar but not quite identical to Bison, and that feature can be used to resolve the "dangling else" shift/reduce conflict which you've encountered, as it is usually applied in bi
TAG : parsing
Date : December 28 2020, 05:45 AM , By : leorick
How do I extract useful information from the payload of a GADT / existential type?
How do I extract useful information from the payload of a GADT / existential type?
this one helps. I'm trying to use Menhir's incremental parsing API and introspection APIs in a generated parser. I want to, say, determine the semantic value associated with a particular LR(1) stack entry; i.e. a token that's been previously consumed
TAG : parsing
Date : December 26 2020, 01:01 AM , By : platformNomad
How to parse Rust code without using procedural macros?
How to parse Rust code without using procedural macros?
may help you . syn is a Rust parser and is not only for procedural macros. Take a look at the "functions" section of the documentation. There you will find these functions (as of syn 0.15): fn parse(tokens: proc_macro::TokenStream) -> Result: this is
TAG : parsing
Date : December 25 2020, 07:01 AM , By : brij
How to Represent Type Information of External Symbols in a local Symbol Table?
How to Represent Type Information of External Symbols in a local Symbol Table?
wish of those help My approach to this kind of dependency is to create one symbol table per module. Such a symbol table can be referenced from any number of other (module) symbol tables (including itself, which makes no sense, but would be possible).
TAG : parsing
Date : December 22 2020, 07:30 AM , By : Viv
Parse input text that is located using left padding spaces
Parse input text that is located using left padding spaces
Any of those help I have the following text structure. The values below JTT JNX JNA JNO belong to previous line. , With GNU awk (which you have) for FIELDWIDTHS:
TAG : parsing
Date : December 06 2020, 11:46 PM , By : John Miller
Is it appropriate for a parser DCG to not be deterministic?
Is it appropriate for a parser DCG to not be deterministic?
With these it helps The first question to ask yourself, is your grammar deterministic, or in the terminology of grammars, unambiguous. This is not asking if your DCG is deterministic, but if the grammar is unambiguous. That can be answered with basic
TAG : parsing
Date : December 05 2020, 06:54 AM , By : Epora75
Parsing within case block
Parsing within case block
it fixes the issue Normally I would just 'unpack' it, however, how would I do this within a case ?
TAG : parsing
Date : December 01 2020, 04:45 PM , By : Diego
How to parse this simple grammar? Is it ambiguous?
How to parse this simple grammar? Is it ambiguous?
fixed the issue. Will look into that further For starters, I’m glad you’re finding our CFG tool useful! A few of my TAs made that a while back and we’ve gotten a lot of mileage out of it.Your grammar is indeed ambiguous. This stems from your R nonter
TAG : parsing
Date : November 26 2020, 04:01 AM , By : user126922
Parsec: Parsing a list of lists, both with the same delimiter
Parsec: Parsing a list of lists, both with the same delimiter
To fix this issue Consider a simple language that's a list of space-delimited commands. Each command takes a single letter as the command name, and a series of space-delimited numbers as its arguments; e.g. a 1 2 3 b 4 5 6 d 7 e f would represent the
TAG : parsing
Date : November 25 2020, 09:00 AM , By : nhuser
Lemon Parser: This rule can not be reduced
Lemon Parser: This rule can not be reduced
will help you The problem is that your grammar is LR(2), not LR(1).Many shift/reduce conflicts arise because it is impossible to know what to do until the token following a %{ is seen. For example, consider the partial template (I've deliberately des
TAG : parsing
Date : November 21 2020, 03:00 PM , By : hsdfhksh
How to parse code blocks in Elisp?
How to parse code blocks in Elisp?
should help you out Emacs's major modes usually do not include a complete parser for the language they support. For indentation purpose they do need to perform some amount of parsing, but it's usually done in a partial and superficial way only.Major
TAG : parsing
Date : November 19 2020, 03:54 PM , By : Eric
How to prove left-recursive grammar is not in LL(1) using parsing table
How to prove left-recursive grammar is not in LL(1) using parsing table
should help you out First of all you are finding FIRST and FOLLOW over the grammar in which you have removed left recursion. Therefore surely if you try to create LL(1) parsing table there won't be any 2 entries as left recursion is removed and gramm
TAG : parsing
Date : November 19 2020, 01:01 AM , By : kgw
confusion in finding first and follow in left recursive grammar
confusion in finding first and follow in left recursive grammar
wish of those help Recently I faced the problem for finding first and follow , Firstly,you'll need to remove left-recursion leading to
TAG : parsing
Date : November 18 2020, 11:13 AM , By : Janko
Implement `Applicative Parser`'s Apply Function
Implement `Applicative Parser`'s Apply Function
it helps some times Your code is predicated on a misunderstanding of what a Parser is. Don't worry, virtually everybody makes this mistake.
TAG : parsing
Date : November 18 2020, 01:01 AM , By : hellboy32
Good type design in Haskell for the AST of a simple language
Good type design in Haskell for the AST of a simple language
hop of those help? Disclaimer, I'm the author of the LLVM tutorial you mentioned.Just use Extern Name [Name], everything after Chapter 3 onward in the tutorial uses that exact definition anyways. I think I just forgot to make Chapter 2 Syntax.hs cons
TAG : parsing
Date : November 17 2020, 11:55 AM , By : Brian Drum
try function in parsing lambda expressions
try function in parsing lambda expressions
wish helps you Don't use if you want to allow both Your program parser does its main work with
TAG : parsing
Date : November 14 2020, 05:16 PM , By : Alan Little
Grammar of calculator in a finite field
Grammar of calculator in a finite field
hop of those help? I have a working calculator apart from one thing: unary operator '-'. , It has to be evaluated and dealt with in 2 difference cases:
TAG : parsing
Date : November 14 2020, 09:01 AM , By : Steven Weber
Program error: undefined member: >>= Haskell
Program error: undefined member: >>= Haskell
I wish this help you I'm implementing a simple interpreter in Haskell but I have this problem. The code is this: , Don't give instances type signatures.
TAG : parsing
Date : November 11 2020, 04:01 AM , By : KaoFloppy
How to identify text file format by its structure?
How to identify text file format by its structure?
it helps some times There really is no one-size-fits-all answer unless you can limit the file formats that can happen. You will always only be able to find a heuristic for identifying formats unless you can get whoever designs these formats to give i
TAG : parsing
Date : November 09 2020, 03:01 PM , By : yatil
Operator precedence with LR(0) parser
Operator precedence with LR(0) parser
it fixes the issue A language can only have an LR(0) grammar if it's prefix-free, meaning that no string in the language is a prefix of another. In this case, the language you're describing isn't prefix-free. For example, the string number + number i
TAG : parsing
Date : November 08 2020, 09:00 AM , By : Mario Tristan
PEG parser for PEG grammars
PEG parser for PEG grammars
may help you . to Ira's comment above, I had a little deeper look and found exactly what I needed.The library I am using is pegjs, and it makes it nice and easy to get the parsed grammar as JSON.
TAG : parsing
Date : November 05 2020, 07:07 PM , By : user124112
How to speed up pandas read_csv?
How to speed up pandas read_csv?
it should still fix some issue You should be able to speed it up a bit by using to_datetime manually instead of using your lambda function:
TAG : parsing
Date : November 04 2020, 09:01 AM , By : FuzzyHornet
Creating FIRST and FOLLOW sets for all non-terminals
Creating FIRST and FOLLOW sets for all non-terminals
around this issue Are you talking about the FIRST1 sets? You simply build a set of all nonterminals, that may be at the beginning of a derivation.Consider the right-hand side of S: every derivation of S starts with the S, a, c, so FIRST1(S) = FIRST1(
TAG : parsing
Date : October 25 2020, 12:12 PM , By : Brian
Trying to parse a custom log using grok
Trying to parse a custom log using grok
I wish this helpful for you I have the following log: , Your pattern can include literals, e.g.
TAG : parsing
Date : October 24 2020, 01:32 PM , By : Guid
Operator precedence and associativity in a parser (Haskell)
Operator precedence and associativity in a parser (Haskell)
like below fixes the issue I've written a paper on unparsing expressions using operator precedence. The appendix to the paper has an operator-precedence parser written in ML, which you could easily adapt to Haskell. The code is downloadable from the
TAG : parsing
Date : October 24 2020, 11:12 AM , By : Kuer
What do the different kinds of LR Parsers use as lookahead?
What do the different kinds of LR Parsers use as lookahead?
it should still fix some issue An LR(0) parser has no lookahead, so it cannot decide between reduce and shift actions if both would be possible in a given parser state. So a reduce state cannot have shift transitions.
TAG : parsing
Date : October 14 2020, 09:30 AM , By : Will
Corner cases with GLR, precedence, and non-associativity: Intended Semantics?
Corner cases with GLR, precedence, and non-associativity: Intended Semantics?
this one helps. Traditional yacc-style precedence rules cannot be used to resolve reduce/reduce conflicts. Yacc/bison "resolve" reduce/reduce conflicts by choosing the first production in the grammar file. This has nothing to do with precedence, and
TAG : parsing
Date : October 08 2020, 06:00 PM , By : Frank Bradley
example or tutorial for Zepto parser in attoparsec
example or tutorial for Zepto parser in attoparsec
wish of those help Here is an example of Redis protocol parser using Zepto.Note that attoparsec allows unbounded backtracking, it makes it inefficient for parsers that don't use backtracking. So moving to Zepto makes sense. You may want to evaluate a
TAG : parsing
Date : October 08 2020, 04:00 AM , By : walshtp
Can I get bison to make yytname externally visible?
Can I get bison to make yytname externally visible?
I wish did fix the issue. You can export the table using a function which you add to your parser file:
TAG : parsing
Date : October 05 2020, 01:00 AM , By : bjorngylling
Extract a string from Response Body in Jmeter
Extract a string from Response Body in Jmeter
To fix the issue you can do Use JSON Extractor Post Processor as a child of Sampler Returning JSON Response.Note : -1 will capture every matching possible. So use -1 when you want all the matches for that particular expression. Here you need the firs
TAG : parsing
Date : October 03 2020, 11:00 PM , By : user181345
How do parentheses work with custom data types?
How do parentheses work with custom data types?
it helps some times I don't understand how parentheses in the second case are implemented in Haskell.
TAG : parsing
Date : September 30 2020, 02:00 AM , By : Simone
How to rewind in Go's text/scanner?
How to rewind in Go's text/scanner?
like below fixes the issue By looking at the API references of text/scanner, I can't seem to find a way to rewind the scanner the way you want. However, the Peek() method would get you the next rune without advancing the scanner. Inside the "not" cas
TAG : parsing
Date : September 29 2020, 11:00 PM , By : Sebastián Ucedo
Why is there a parse error in this Haskell 'else if' statement?
Why is there a parse error in this Haskell 'else if' statement?
Any of those help Just delete let z = everywhere it appears, and you'll be on your way to your next error.
TAG : parsing
Date : September 27 2020, 10:00 PM , By : Lathentar
operator precedence with more than 2 recursions
operator precedence with more than 2 recursions
help you fix your problem The 'precdence' rules in bison really don't have much to do with operator precedence in the traditional sense -- they're really just a hack for resolving shift-reduce conflicts in a way that can implement simple operator pre
TAG : parsing
Date : September 26 2020, 02:00 PM , By : CSCI GOIN KILL ME
How to parse the message to get sender phone number and text messege in a C program?
How to parse the message to get sender phone number and text messege in a C program?
I wish this helpful for you I would like to provide alternative solution, solving some issues that are not evaluated in the other answers. The number has to be stored as a string (since '+' char is part of it) Parsering an AT command response is not
TAG : parsing
Date : September 23 2020, 05:00 PM , By : Arnaud Goudsmit
Using awk sed et al. to parse fields from a file having no end tags
Using awk sed et al. to parse fields from a file having no end tags
I wish this helpful for you Might be barely possible in GNU sed... but it would be better to use something with a hashtable, or at least more variables than the hold space:sed -nE '/GROUPNUMBER:/{s/.*://;h};/GROUPMEMBER:/{N;G;s/GROUPMEMBER:(.*):MEMBE
TAG : parsing
Date : September 23 2020, 06:00 AM , By : Edwin
Mid rule actions bison - what is the meaning $n in mid rule?
Mid rule actions bison - what is the meaning $n in mid rule?
like below fixes the issue This is explained in more detail in the bison manual section on Midrule actions.Yes, in your example $1 refers to the value of the terminal Art.
TAG : parsing
Date : September 23 2020, 04:00 AM , By : Ohad Barzilay
How can you write a customizable grammar?
How can you write a customizable grammar?
will be helpful for those in need All this takes is 5 or 10 lines of boilerplate, depending on whether or not you use an actions class.If you take a look at Metamodel::GrammarHOW, as of writing, you'll find this:
TAG : parsing
Date : September 21 2020, 05:00 PM , By : user183275
Parser with multiple return types
Parser with multiple return types
it helps some times When designing DSLs, it's very common to define a new data type representing all the different shapes values can have:
TAG : parsing
Date : September 21 2020, 08:00 AM , By : user182548
Hint.interpret gives a compiler error when used on a Polysemy.Sem value
Hint.interpret gives a compiler error when used on a Polysemy.Sem value
seems to work fine Not an answer, but I've made some discoveries which you might find helpful.I thought it might be the bogus prefix type operator syntax ': x xs which is not valid Haskell (you would have to either write it infix or use (':)). So I i
TAG : parsing
Date : September 20 2020, 09:00 PM , By : lewing
SR conflict in a grammar - how to resolve it? (Lemon/yacc)
SR conflict in a grammar - how to resolve it? (Lemon/yacc)
it fixes the issue I have put together a grammar in Lemon (which is similar to YACC) but it is producing an S/R conflict. I am not used to LALR parsing and don't understand what the problem is, nor how to resolve it. The grammar is: , The conflict co
TAG : parsing
Date : September 19 2020, 05:00 PM , By : wiznick
Haskell - Parsec with state
Haskell - Parsec with state
wish help you to fix your issue The simplest way to incorporate a "state" into a parser is not to do it at all. Let's say we have a tic-tac-toe board:
TAG : parsing
Date : September 14 2020, 03:00 AM , By : Roel van Dijk
How to get string parser to terminate
How to get string parser to terminate
this one helps. I have found that a solution is to track the parsing position, and quit the loop if the position has not increased. It's not very pretty though; maybe someone will come up with something better.The code is as the example in the questi
TAG : parsing
Date : September 01 2020, 09:00 PM , By : Eugenio
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