What's the proper way to implement a parser in Delphi?-CodePudding

There are a lot of frameworks, libraries to help you writing parsers in languages like JavaScript or Rust. Now I need to write a parser in Delphi. After some Googling, it seems there is no prominent Delphi project for this. I want to know how you Delphi guys writing parsers? Is there any libraries to help me (paid commercial product is fine)? Btw, I'm new to Delphi.

CodePudding user response：

Things you might have neglected are,

Many of the parser frameworks (like ANTLR/PEG) are extensible, so even if by default they don't ship with a language support for Delphi/Pascal, you can find somebody else's work or write your own.
ANTLR 3 has Delphi support, such as language target(used to compile grammars to Delphi/Pascal) as well as runtime(the runtime to include in your application to enable the compiled parser code). But ANTLR 4 drops such, probably due to the fact that not many people use Delphi compared to other languages.
For commercial parser frameworks, you should talk directly to their presale guys and see if they already have Delphi/Pascal support. They usually have an out-of-date website, so not easy to know what target languages they really support.

CodePudding user response：

Parser for what? If its for something like a string you can use this parser:

function Parse(Source, L, R: string): string;
begin
  Delete(Source, 1, Pos(L, Source)   Length(L) - 1);
  Result := Copy(Source, 1, Pos(R, Source) - 1);
end;

L - From first time "" found in the text L - To the next "" found in the text

It works pretty great with parsing sources from a website for data.