I am trying to solve past year exam papers for Compilers and i am stuck with this question please help me Z → d | XY Z Y → c | ϵ X → Y | a like I am getting confused , its. a loop there and i cant ...

I am trying to parse code into AST. I want to keep minimum keywords and delimiters in the AST while keeping the semantics. In Python function definition def foo():, the last : is syntactically ...

Since we have no parentheses () in rust if and while conditions, there may be some ambiguous situations, e.g. while 0 > n {} {} is either parsed to be while (0 > n) {} and {} (2 statements), or ...

Having trouble understanding the ambiguity reported by Antlr4 (4.7.1): grammar Temp; start: expr; expr: IDENTIFIER '(' expr (',' expr)* ')' // function call | expr '.' slice2 ...

I am trying to implement a parser for first-order logic formulas in Rust using pest (which seems to be the reference in Rust). Apparently, this library is not based on context-free grammars but on ...

I have individual verbs in a collection of String objects (thanks to How to find whether a word is a noun or a verb using Stanford parser?). Now for each, I would like to obtain the appropriate noun ...

In the "Compiler Design in C" book, below is a table on a simple expression grammar. According to the below excerpts: Note that the grammar is recursive. For example, Production 2 has ...

Below code tokenises the text and identifies the grammar of each tokenised word. import nltk from nltk.tokenize import sent_tokenize, word_tokenize from nltk.corpus import wordnet as wn #nltk....

I wrote this grammar to describe a simple patch procedure we use at work, operating on source code files. Engineers check in files of the form: {ignored space} //find_start {possible comment or ...

how to remove this warning : warning(180): AlgoGrammar.g4:54:13: chars a-z used multiple times in set [A-Za-z_] warning(180): AlgoGrammar.g4:54:23: chars a-z used multiple times in set [A-Za-z0-9_] ...

I saw an article about the Result pattern on the official flutter site(https://docs.flutter.dev/app-architecture/design-patterns/result), and I thought it was a good structure, so I tried to apply it ...

Below are two grammars. In this grammar, semantic predicates do "work". I.e. if they are false, rules don't match and if they are true, rules do match: expr : term | expr asterisk ...

Is the following good grammar for Nearley.js? It describes logical expressions with variables, negation, conjunction and parentheses. It's a bit convoluted (?), but I didn't know other way how to make ...

I have a problem with a [relatively simple] grammar, a distilled version of a much bigger grammar. Bison reports one shift/reduce conflict, which is resolved incorrectly: the resulting parser fails to ...

I want to write a Raku grammar to check a monthly report about work contribution factors, written in Racket/Scribble. The report is divided, at the highest level, into monthly sections, and beneath ...