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(in-package :xfdf)
(defun write-xfdf (output-stream fields)
"Write an XFDF document to `output-stream` using cons cells in the `fields`
list."
(format output-stream "~
<?xml version=\"1.0\" encoding=\"UTF-8\"?>
<xfdf xmlns=\"http://ns.adobe.com/xfdf/\" xml:space=\"preserve\">
<fields>
")
; (loop for (name . value) in fields
; do
; (let ((value (cond ((eq value t) "Yes")
; ((eq value nil) "Off")
; (t value))))
; (format output-stream " <field name=\"~A\">
; <value>~A</value>
; </field>
; "
; name
; value)))
(loop for (name . value) in fields
do
(format output-stream "~A" (field-xfdf name value)))
(format output-stream " </fields>
</xfdf>")
output-stream)
(defconstant +field-base-indentation+ 2)
(defun field-xfdf (name value)
"Build an XFDF XML string for a field."
(field-xfdf* name value 0))
(defun field-xfdf* (name value nesting-level)
"Build an XFDF XML string for a field. The `nesting-level` specifies the
amount of indentation to use relative to the +field-base-indentation+."
(let ((indent (+ +field-base-indentation+ nesting-level)))
;; TODO: Add checkbox default values.
(if (consp value)
;; TODO: We need to do something with value
;; TODO: How to concat results from dolist?
(let ((inner-fields
(loop for field in value
collect
(let ((subname (if (listp field)
(first field)
field))
(subfield (if (listp field)
(rest field)
field)))
(field-xfdf* subname subfield (1+ nesting-level))))))
(build-xfdf-outer-field name inner-fields indent))
;; TODO: Put checkbox stuff here.
(let ((value (pdf-checkbox-value value)))
(build-xfdf-field name value indent)))))
;; * (format t "~v{~A~:*~}<>~A" 5 '("Hello") "Next")
(defun pdf-checkbox-value (value)
"If `value` is T or NIL, convert it to the default PDF checkbox values
'Yes' and 'Off' respectively.
If `value` is anything else, return its identity."
(cond ((eq value t) "Yes")
((eq value nil) "Off")
(t value)))
(defun build-xfdf-outer-field (name inner-fields-string indent)
"Build the XFDF XML for a field containing other fields."
(format nil "~
~v{~A~:*~}<field name=\"~A\">
~{~A~}~v{~A~:*~}</field>
"
indent
'(" ")
name
inner-fields-string
indent
'(" ")))
(defun build-xfdf-field (name value indent)
"Build the XFDF XML for a single field."
(format nil "~
~v{~A~:*~}<field name=\"~A\">
~v{~A~:*~} <value>~A</value>
~v{~A~:*~}</field>
"
indent
'(" ")
name
indent
'(" ")
value
indent
'(" ")))
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