Recent questions tagged Grammar

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grammar - Antlr4 unexpectedly stops parsing expression

I'm developing a simple calculator with the formula grammar: grammar Formula ; expr : <assoc=right> expr POW ... parsing: What am I missing? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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grammar - What is an expandable string in PowerShell

In PowerShell's documentation, I have come across the expression expandable string: Argument mode is designed for ... string in PowerShell? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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800 views

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grammar - How to control error handling and synchronization in Antlr 4 / c#

I'm using Antlr 4 with c# target. Here is a subset of my grammar: /* * Parser Rules */ text : term+ EOF; ... ? and How to get the ignored text? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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grammar - How does the right-shift operator work in a python print statement?

I've seen someone using "print" with ">>" to write stuffs into a file: In [7]: with open('text', ' ... instead of just using the "write" method? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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390 views

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grammar - Why isn't this a syntax error in python?

Noticed a line in our codebase today which I thought surely would have failed the build with syntax error, ... a known/documented behaviour? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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331 views

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grammar - Is HTML a context-free language?

Reading some related questions made me think about the theoretical nature of HTML. I'm not talking about XHTML- ... the wikipedia article ;) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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205 views

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grammar - Why the need for terminals? Is my solution sufficient enough?

I'm trying to get my head around context free grammars and I think I'm close. What is baffling me is this one ... string to do so? S = A See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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568 views

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grammar - Why is the separator in a TypeScript TypeMemberList semicolon as opposed to comma?

This is a typescript interface: interface A { l: { x: string; y:number } } But this (similar thing) ... parser, or for some other reason? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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301 views

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grammar - What is the language of this deterministic finite automata?

Given: I have no idea what the accepted language is. From looking at it you can get several end results: 1.) bb 2.) ... .) bbab(a, b) 4.) bbaaa See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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