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Date: Tue, 22 Oct 2013 19:47:01 +0100
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Xref: csiph.com comp.lang.python:57298

On 22/10/2013 19:22, Mark Janssen wrote:
>>> Okay.  The purpose of BNF (at least as I envision it) is to
>>> produce/specify a *context-free* "grammar".  A lexer parses the tokens
>>> specified in the BNF into an Abstract Syntax Tree.  If one can produce
>>> such a tree for any given source, the language, in theory, can be
>>> compiled by GCC into an executable.
>>>
>>> Boom.
>>>
>> But you still need to specify the semantics.
>
> In my world, like writing pseudo-code or flow-charts, the AST *is* the
> semantics.  What world are you guys from?
>
The real world. :-)

So what you're saying is that you generate an AST where there are
certain pre-defined operations (primitives?) available?