Library: Markup utilities (OMMARKUPUTILITIES) Import: ommarkuputilities.xmd

Purpose

An instance of the markup-buffer data type can be used for storing and reproducing a markup stream. Apart from the data type itself, the markup utilities library also provides:

• two conversion functions for obtaining a markup sink or a markup source from an instance of the markup-buffer type,
• another conversion function from string to markup-buffer, and
• the equality comparison operators = and != between two markup-buffer instances.

You can use the markup sink to write a markup stream into the buffer. To obtain the sink, cast the buffer to a markup sink or prefix it by using output as. To reproduce the previously written markup stream, cast it to a markup source or simply start reading the contents of the buffer using the do markup-parse action.

Example

This example program parses an XML document in the file inclusion.xml and buffers the parsed markup stream. Then it parses another SGML document container.sgml, replacing every occurrence of element reference within it by the buffered inclusion.xml document. After this preprocessing step, the transformed SGML document can be subjected to final processing.

  import "ommarkuputilities.xmd" unprefixed
  
  global markup-buffer replacement
  
  
  define markup source function
     replace-references
  as
     using group "replace references"
     do sgml-parse document scan file "container.sgml"
        output "%c"
     done
  
  
  process
     using output as replacement
     do xml-parse scan file "inclusion.xml"
        output #content
     done
  
     using group "process transformed document"
     do markup-parse replace-references
        output "%c%n"
     done
  
  
  group "replace references"
  
  element "reference"
     output replacement
     suppress
  
  element #implied
     signal throw #markup-start #current-markup-event
     output "%c"
     signal throw #markup-end #current-markup-event
  
  
  group "process transformed document"
  
  element #implied
     output "<%q>%c</%q>"
            

Related Topics Data type conversion Linking Chains of Streaming Markup Filters

Other Library Functions markup-buffer split-external-text-entities

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