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Introduction

This example of an up-translate program converts RTF (Rich Text Format) into SGML.

The program does the following:

• Style number 23 is recognized at the start of a paragraph.
• A variety of alternative codings of characters (protected by "\" and identified symbolically or as hexidecimal) are recognized.
• All other RTF commands are ignored.

In practice, preamble material (style sheets) will need to be skipped over, and other styles and paragraph commands (such as "\par") will need to be recognized.

  up-translate

  find "\s23" lookahead ! digit
     output "<p>"

  find "\" letter [letter | digit | "-"]* | ; RTF command
       "\" any |                            ; other RTF code
       ["{}"]                               ; RTF grouping
     ; output nothing for these.

  find "\" ["{}\"] => protected-character
     output protected-character ; some characters are protected by \

  find "\'" any {2} => hex-code ; some characters are in hexadecimal
     local counter character-value
     set character-value to hex-code base 16
     output "&#%d(character-value);"

  find "<"
     output "<<!>" ; "<" often needs protecting in the SGML

  find "&"
     output "&<!>" ; likewise "&"

Related Concepts      Up-translation: translating documents into XML/SGML

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