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Re: I have managed to parse and evaluate using an AST. I got stuck in statements and block

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On 2015/02/18 20:20, mehmet.coskun@gmail.com wrote:

> I am writing a simple interpreter.

> ...I got stuck in implementing statements, code block, if and while statements.

As already pointed out, it easier to use parser generating tools like
Flex and Bison <https://gnu.org/software/bison/>. The latter has a
complete calculator example in for example C++ - easy to start with, and
then modify.

There is no clear distinction between a compiler or an interpreter, as
one can choose the point of execution; an interpreter might decide to
generate compiler code, and then execute it. This is possible with LLVM
<http://clang.llvm.org>, which has examples on how to get started.

As for code blocks and assignments/definitions, one needs a stacked name
look-up table: the lexer checks the name if it is defined on the table,
and if so, returns its correct grammatical type. If there is an inner
block (environment), one pushes a new level on the name table stack,
which is popped when the environment ends. Definitions always creates
names in the current level, whereas assignments write into existing
variables.

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I have managed to parse and evaluate using an AST. I got stuck in statements and block mehmet.coskun@gmail.com - 2015-02-18 11:20 -0800
  Re: I have managed to parse and evaluate using an AST. I got stuck in statements and block Christian Gollwitzer <auriocus@gmx.de> - 2015-02-19 10:22 +0100
  Re: I have managed to parse and evaluate using an AST. I got stuck in statements and block BartC <bc@freeuk.com> - 2015-02-19 21:51 +0000
    Re: I have managed to parse and evaluate using an AST. I got stuck in statements and block BartC <bc@freeuk.com> - 2015-02-21 20:52 +0000
      Re: I have managed to parse and evaluate using an AST. I got stuck in statements and block mehmet.coskun@gmail.com - 2015-03-05 18:53 -0500
  Re: I have managed to parse and evaluate using an AST. I got stuck in statements and block Hans Aberg <haberg-news@telia.com> - 2015-02-20 15:47 +0100

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