[cl-who-devel] Runtime HTML generation
Is there a Right Way to use CL-WHO to generate HTML at run time? For example, suppose I want to do something like this: (defun make-table (l) `(:table ,@(mapcar (lambda (row) `(:tr ,@(mapcar (lambda (cell) `(:td (str ,cell))) row))) l))) (cl-who:with-html-output-to-string (*standard-output* nil :prologue t) ... (make-table l) ...) This doesn't work because CL-WHO normally does all its work at compile time, but L is not known until run time. I can hack this using a macro that calls EVAL, or by hacking the CL-WHO code to add another specially handled symbol, but before diving into that rabbit hole I thought I'd ask if there was already a way of doing this that I've overlooked. Thanks, rg
Hi Ron, You can use the with-html-output-to-string function to generate HTML at run-time. Using it in a macro, you can then do data-driven HTML construction using mapcar, loop, etc. Joubert On Jan 23, 2010, at 12:51 PM, Ron Garret wrote:
Is there a Right Way to use CL-WHO to generate HTML at run time? For example, suppose I want to do something like this:
(defun make-table (l) `(:table ,@(mapcar (lambda (row) `(:tr ,@(mapcar (lambda (cell) `(:td (str ,cell))) row))) l)))
(cl-who:with-html-output-to-string (*standard-output* nil :prologue t) ... (make-table l) ...)
This doesn't work because CL-WHO normally does all its work at compile time, but L is not known until run time. I can hack this using a macro that calls EVAL, or by hacking the CL-WHO code to add another specially handled symbol, but before diving into that rabbit hole I thought I'd ask if there was already a way of doing this that I've overlooked.
Thanks, rg
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Joubert Nel <joubert.nel@infiniteimprobability.com> writes:
Hi Ron,
You can use the with-html-output-to-string function to generate HTML at run-time. Using it in a macro, you can then do data-driven HTML construction using mapcar, loop, etc. with-html-output-to-string is a macro.
-- With Best Regards, Stas.
No, that won't work. with-html-output-to-string is a macro, not a function. It does its work at macroexpansion time, not run-time. (You might want to re-read my original message.) rg On Jan 23, 2010, at 11:45 AM, Joubert Nel wrote:
Hi Ron,
You can use the with-html-output-to-string function to generate HTML at run-time. Using it in a macro, you can then do data-driven HTML construction using mapcar, loop, etc.
Joubert
On Jan 23, 2010, at 12:51 PM, Ron Garret wrote:
Is there a Right Way to use CL-WHO to generate HTML at run time? For example, suppose I want to do something like this:
(defun make-table (l) `(:table ,@(mapcar (lambda (row) `(:tr ,@(mapcar (lambda (cell) `(:td (str ,cell))) row))) l)))
(cl-who:with-html-output-to-string (*standard-output* nil :prologue t) ... (make-table l) ...)
This doesn't work because CL-WHO normally does all its work at compile time, but L is not known until run time. I can hack this using a macro that calls EVAL, or by hacking the CL-WHO code to add another specially handled symbol, but before diving into that rabbit hole I thought I'd ask if there was already a way of doing this that I've overlooked.
Thanks, rg
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On Sat, 2010-01-23 at 12:20 -0800, Ron Garret wrote:
No, that won't work. with-html-output-to-string is a macro, not a function. It does its work at macroexpansion time, not run-time. (You might want to re-read my original message.)
This works - I just put an example up on a website to try it - code is there: http://jandmworks.com/test.html (defun make-table (l) (with-html-output (*standard-output*) (:table :border 1 (mapcar (lambda (row) (htm (:tr (mapcar (lambda (cell) (htm (:td (str cell)))) row)))) l)))) The list I'm passing it could have come from anywhere - a file, a posted response, etc. Jeff
rg
On Jan 23, 2010, at 11:45 AM, Joubert Nel wrote:
Hi Ron,
You can use the with-html-output-to-string function to generate HTML at run-time. Using it in a macro, you can then do data-driven HTML construction using mapcar, loop, etc.
Joubert
On Jan 23, 2010, at 12:51 PM, Ron Garret wrote:
Is there a Right Way to use CL-WHO to generate HTML at run time? For example, suppose I want to do something like this:
(defun make-table (l) `(:table ,@(mapcar (lambda (row) `(:tr ,@(mapcar (lambda (cell) `(:td (str ,cell))) row))) l)))
(cl-who:with-html-output-to-string (*standard-output* nil :prologue t) ... (make-table l) ...)
This doesn't work because CL-WHO normally does all its work at compile time, but L is not known until run time. I can hack this using a macro that calls EVAL, or by hacking the CL-WHO code to add another specially handled symbol, but before diving into that rabbit hole I thought I'd ask if there was already a way of doing this that I've overlooked.
Thanks, rg
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Ah. I think I get it now. Thanks! rg On Jan 23, 2010, at 12:56 PM, J. K. Cunningham wrote:
On Sat, 2010-01-23 at 12:20 -0800, Ron Garret wrote:
No, that won't work. with-html-output-to-string is a macro, not a function. It does its work at macroexpansion time, not run-time. (You might want to re-read my original message.)
This works - I just put an example up on a website to try it - code is there:
http://jandmworks.com/test.html
(defun make-table (l) (with-html-output (*standard-output*) (:table :border 1 (mapcar (lambda (row) (htm (:tr (mapcar (lambda (cell) (htm (:td (str cell)))) row)))) l))))
The list I'm passing it could have come from anywhere - a file, a posted response, etc.
Jeff
rg
On Jan 23, 2010, at 11:45 AM, Joubert Nel wrote:
Hi Ron,
You can use the with-html-output-to-string function to generate HTML at run-time. Using it in a macro, you can then do data-driven HTML construction using mapcar, loop, etc.
Joubert
On Jan 23, 2010, at 12:51 PM, Ron Garret wrote:
Is there a Right Way to use CL-WHO to generate HTML at run time? For example, suppose I want to do something like this:
(defun make-table (l) `(:table ,@(mapcar (lambda (row) `(:tr ,@(mapcar (lambda (cell) `(:td (str ,cell))) row))) l)))
(cl-who:with-html-output-to-string (*standard-output* nil :prologue t) ... (make-table l) ...)
This doesn't work because CL-WHO normally does all its work at compile time, but L is not known until run time. I can hack this using a macro that calls EVAL, or by hacking the CL-WHO code to add another specially handled symbol, but before diving into that rabbit hole I thought I'd ask if there was already a way of doing this that I've overlooked.
Thanks, rg
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participants (4)
-
J. K. Cunningham -
Joubert Nel -
Ron Garret -
Stas Boukarev