Subversion Repositories wimsdev

  of the pair of parentheses substituted. The result of the substitution

  of the pair of parentheses substituted. The result of the substitution

  will then be used as the name of variable, and finally the whole thing

  will then be used as the name of variable, and finally the whole thing

  will be replaced by the value of the last variable. This allows nested

  will be replaced by the value of the last variable. This allows nested

  substitutions, as well as substitution of a variable which is followed

  substitutions, as well as substitution of a variable which is followed

  by an alphanumeric character.

  by an alphanumeric character.

  and the variable $(emph)alpha3beta$emphend has value $(emph)pi$emphend,

  and the variable $(emph)alpha3beta$emphend has value $(emph)pi$emphend,

  the string<pre>3*$$(alpha$$(i)beta)*x</pre>

  the string<pre>3*$$(alpha$$(i)beta)*x</pre>

  will become<pre>3*pi*x</pre>

  will become<pre>3*pi*x</pre>

  after substitution.

  after substitution.

  <p>

  <p>

  <li>If the character $emph$$$emphend is followed by the left bracket

  <li>If the character $emph$$$emphend is followed by the left bracket

  $emph[$emphend, the matching $emph]$emphend will be located, the content

  $emph[$emphend, the matching $emph]$emphend will be located, the content

  of the pair of brackets substituted then evaluated to a real number value whose

  of the pair of brackets substituted then evaluated to a real number value whose

  precision depends on the value of $emph print_precision$emphend.

  precision depends on the value of $emph print_precision$emphend.

  This value will replace the whole thing

  This value will replace the whole thing

  It can be used for array subscripts.

  It can be used for array subscripts.

  then the string<pre>

  then the string<pre>

  $$(a$$[$$i-1])*x+$$(a$$[$$i-2])</pre>will become<pre>

  $$(a$$[$$i-1])*x+$$(a$$[$$i-2])</pre>will become<pre>

  pi*x+3</pre>after substitution.

  pi*x+3</pre>after substitution.

 <li>If the value of a variable being substituted contains the character

 <li>If the value of a variable being substituted contains the character

  $emph$$$emphend, this value will again be substituted, until no more

  $emph$$$emphend, this value will again be substituted, until no more

  substitution is needed. The server has a built-in limit of nested

  substitution is needed. The server has a built-in limit of nested

  substitutions; infinite nested substitions will violate this limit and

  substitutions; infinite nested substitions will violate this limit and

  generate an error message.

  generate an error message.

</ul>

</ul>

The following names are reserved for their special meanings. They should not be

The following names are reserved for their special meanings. They should not be

used for internal needs of any module.

used for internal needs of any module.

<ul>

<ul>

 <li>Variables named

 <li>Variables named

  !for i in cmd,module,session,lang,special_parm,user,useropts,worksheet

  !for i in cmd,module,session,lang,special_parm,user,useropts,worksheet

   $emph$i$emphend,

   $emph$i$emphend,

  !next i

  !next i

  are reserved for special parameter passing by the user. A module's variable

  are reserved for special parameter passing by the user. A module's variable

  Refer to the section $emph$title_structure$emphend for the meaning of

  Refer to the section $emph$title_structure$emphend for the meaning of

  these variables.

  these variables.

  Parameters in the user query string with no name (for example when the

  Parameters in the user query string with no name (for example when the

  coordinate of a mappable image is passed this way to the http server) will

  coordinate of a mappable image is passed this way to the http server) will

  be registered under this variable. For this reason, it should not be used

  be registered under this variable. For this reason, it should not be used

  for other purposes.

  for other purposes.

 <li>All variable names starting with $emph wims_$emphend will have special

 <li>All variable names starting with $emph wims_$emphend will have special

   $table_tr<td>$emph module_address$emphend<td>e-mail address of the (principal) author

   $table_tr<td>$emph module_address$emphend<td>e-mail address of the (principal) author

   $table_tr<td>$emph module_maintainer$emphend<td>name of the actual maintainer

   $table_tr<td>$emph module_maintainer$emphend<td>name of the actual maintainer

   $table_tr<td>$emph module_maintainer_address$emphend<td>e-mail address of the maintainer

   $table_tr<td>$emph module_maintainer_address$emphend<td>e-mail address of the maintainer

   $table_tr<td>$emph module_copyright$emphend<td>copyright notice of the module

   $table_tr<td>$emph module_copyright$emphend<td>copyright notice of the module

   $table_tr<td>$emph module_version$emphend<td>current version of the module

   $table_tr<td>$emph module_version$emphend<td>current version of the module

        to run this module

        to run this module

        (exercise, tool, course, pedia, recreation, adm, other)

        (exercise, tool, course, pedia, recreation, adm, other)

   $table_tr<td>$emph module_level$emphend<td>level of the module

   $table_tr<td>$emph module_level$emphend<td>level of the module

   $table_tr<td>$emph module_domain$emphend<td>algebra, analysis, geometry, ...

   $table_tr<td>$emph module_domain$emphend<td>algebra, analysis, geometry, ...

   $table_tr<td>$emph module_keywords$emphend<td>keywords, to be placed in the html header

   $table_tr<td>$emph module_keywords$emphend<td>keywords, to be placed in the html header

   $table_tr<td>$emph module_scoring$emphend<td>= yes if the module gives scores according to wims standard

   $table_tr<td>$emph module_scoring$emphend<td>= yes if the module gives scores according to wims standard

  have value "yes" if the module's directory contains the respective

  have value "yes" if the module's directory contains the respective

  .phtml file. These variables are used in the command <tt>!homeref</tt>.

  .phtml file. These variables are used in the command <tt>!homeref</tt>.

 <li>Certain environment variables setup by httpd are readable by wims

 <li>Certain environment variables setup by httpd are readable by wims

  modules under names starting with $emph httpd_$emphend. For example, the

  modules under names starting with $emph httpd_$emphend. For example, the

  environment variable $emph REMOTE_HOST$emphend becomes

  environment variable $emph REMOTE_HOST$emphend becomes

  Please refer to httpd protocol specifications for details of such variables.

  Please refer to httpd protocol specifications for details of such variables.

 <li>All variable names starting with $emph ins_$emphend, $emph

 <li>All variable names starting with $emph ins_$emphend, $emph

  insplot_$emphend, $emph instex_$emphend will have special meanings for the

  insplot_$emphend, $emph instex_$emphend will have special meanings for the

  corresponding dynamic insertion engines. A module should read or write them

  corresponding dynamic insertion engines. A module should read or write them

  only for the special meanings they are designed for.

  only for the special meanings they are designed for.