if <boolean-comparison>
   <input-block>
   else
   <alternative-input-block>
   endif

   case <case-variable>
   when <case-evaluator>
   <input-block>
   when <case-evaluator>
   <input-block>
   otherwise
   <alternative-input-block>
   endcase

   while <boolean-comparison>
   <input-block>
   endwhile

   for <loop-variable>=<for-each-list>
   <input-block>
   endfor

   loop <loop-variable>=<range-definition>
   <input-block>
   endloop

   jump <target-label>
   <input-block>
   label <target-label>

   jumpcond <target-label> <boolean-comparison>
   <input-block>
   label <target-label>

A <for-each-list> is a list of strings separated by the current argdelim <special-function>.

A <counter-variable> is a numeric variable that gets automatically initialized to 0 or 1 and incremented at each iteration of the for loop. There are four such variables: the name of these variables are the same as the corresponding <loop-variable> with the following suffixes:

• _counter, starting from 1;

• _COUNTER, starting from 1;

• _counter0, starting from 0.

• _COUNTER0, starting from 0;

A <total-loops-variable> is a numeric variable that gets automatically initialized with the for loop. There are two such variables: the name of these variables are the same as the corresponding <loop-variable> with suffixes _loops and _LOOPS respectively.

All <counter-variable>'s and <total-loops-variable>'s get automatically unset after the corresponding endfor instruction.

A <range-definition> is a list of two or three numbers separated by the current argdelim <special-function>. The first number specifies the initialization value for the <loop-variable>; the second number specifies the loop termination value; the third optional number specifies the loop increment or decrement step, which defaults to 1 if not otherwise specified.

A <loop-variable> is a <variable> that gets automatically initialized and updated by Tefigel while performing the corresponding loop.

A <target-label> is a sequence of non-blank characters, that is a sequence of letters, digits and underscore ('_').

When performing a conditional statement, the <input-block> is processed if the value of <boolean-comparison> is true, whereas the <alternative-input-block> is processed if the value of <boolean-comparison> is false. The else instruction and the <alternative-input-block> may be omitted.

When performing a multiblock conditional statement, each <input-block> is processed if the value of the related <case-evaluator> applied to the <case-variable> yields true, whereas the <alternative-input-block>, if present, is processed only if all <case-evaluator>'s evaluate to false.

When performing a loop, depending on the type of loop, the <input-block> is repeatedly processed as long as:

• The value of <boolean-comparison> of a while loop is true;

• There are still items in the <for-each-list> of a for loop;

• The value of the <loop-variable> of a numeric loop lies still in the <range-definition>.

When performing a conditional transfer of control, on processing the jumpcond instruction, if the <boolean-comparison> yields true, file generation control is transferred to the input line immediately following the label instruction, so that the <input-block> is not processed. Both forward and backward conditional transfer of control are allowed.

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