[colm-users] new way of constructing trees
thurston at complang.org
Thu Sep 10 01:28:39 UTC 2009
Like reparse in TXL, except you don't have to give it all the text at
once. You can can give it bit-by-bit.
The syntax might not be right. I'm currently using the same syntax as
for match and construct (literals in "). Both of these have a type
associated with them and are parsed at compile-time. This does not have
a type, instead it's just like text that gets parsed at run-time. That's
one syntax, two meanings. Not the greatest.
I'm thinking maybe use backticks instead to specify text with embedded
`void f( int i, [SomeType] j );`
Jim Cordy wrote:
> Cool, I think - not sure that I understand!
> On 9-Sep-09, at 7:54 PM, Adrian Thurston wrote:
>> I'm experimenting with a new way in Colm to make trees. The existing
>> construct expression is useful for building trees in a bottom up
>> fashion. It is parsed at compile-time to give some static assurance of
>> The existing parse expression can be used to parse from a stream
>> or reparse the text of a tree as a new type. The parsing happens at
>> run-time and may fail.
>> A new third method, the accumulator, can be used to incrementally
>> a tree by parsing little bits at a time. This is useful for building
>> output tree over the course of a top-down, left-right traversal.
>> See here for a simple example:
>> colm-users mailing list
>> colm-users at complang.org
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> colm-users at complang.org
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