(aspell.info.gz) Compound Words

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 C.1 Compound Words
 ==================
 
 In some languages, such as German, it is acceptable to string two words
 together, thus forming a compound word.  However, there are rules to
 when this can be done.  Furthermore, it is not always sufficient to
 simply concatenate the two words.  For example, sometimes a letter is
 inserted between the two words.  Aspell currently has support for
 unconditionally stringing words together.  I tried implementing more
 sophisticated support for compound words in Aspell but it was too
 limiting and no one used it.
 
    After receiving feedback from several people it seems that acceptable
 support for compound words involved two basically independent parts.
 If this is not sufficient for your language please let me know.
 
 Part One
 ========
 
 Describes how the word needs to be changed when forming a compound
 
      CMP <flag> <strip> <add> <cond> <cond2>
 
      <flag>  is the compound flag
      <strip> is the string to strip or 0 for the null string
      <add>   is the string to add or 0 for the null string
      <cond>  is the condition to match at the end of the current word
      <cond2> is the condition to match at the beginning of the next word
 
 All but the last field are the same as a suffix entry in the existing
 affix code.
 
    <cond> is a simplified regular expression.  Some examples:
      . (for anything)
      e
      [^aeiou]y
      [^ey]
      [aeiou]y
 
    It does not seem necessary to change the beginning of a word when
 forming compounds
 
 Part Two
 ========
 
 Describes the position a word can appear in (beginning, middle, or end)
 and with which words.
 
    To do this each word can be assigned a category.  Then each category
 can be given a set of rules to describe how it can be used in a
 compound word for example
 
      A + B: indicates that category A may appear at the beginning of a
        word when followed by a category B word.  When combined it is then
        considered a category B word.
      A + C + B: here a C word may only appear between an A or B word
      A + A + B
      A + A
      A + A + A
      etc..
 
    I have not decided if a word should be allowed to belong to more than
 one category as a new category can be created in necessary to mean
 words in both category A and B for example.
 
 C.1.1 To Implement
 ------------------
 
 To implement support for compound words based on the above description
 the following will need to be done:
 
   1. expand the affix code to support special compound flags as
      described in part one
 
   2. write code to store the conditions as described in part two
 
   3. expand the compound checking code to check against the conditions
 
   4. expand the dictionary format to store the necessary compound info
      with the word
 
 
    I don't know when I will be able to actually implement this.  If you
 would like to try please let me know.
 
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