.LEFT MARGIN 8
.RIGHT MARGIN 72
.TEST PAGE 34
.LITERAL
commands

        +-------------------+             +---------------------+
---+--->|  COMMENT          |----+------->| end of input string |
   |    +-------------------+    ^        +---------------------+
   |                             |                                 
   |    +-------------------+    |
   +--->|  COMMAND FILES    |--->+
   |    +-------------------+    |
   |                             |
   |    +-------------------+    |
   +--->|  DISPLAY          |--->+
   |    +-------------------+    |
   |                             |
   |    +-------------------+    |
   +--->|  HELP             |--->+
   |    +-------------------+    |
   |                             |
   |    +-------------------+    |
   +--->|  INPUT            |--->+
   |    +-------------------+    |
   |                             |
   |    +-------------------+    |
   +--->|  SHOW             |--->+
   |    +-------------------+    |
   |                             |
   |    +-------------------+    |
   +--->|  ASSIGNMENT       |--->+
   |    +-------------------+    |
   |                             |
   |    +-------------------+    |
   +--->|  EXPRESSION       |--->+
        +-------------------+
.END LITERAL
.TEST PAGE 6
.LITERAL

comment

        +-----+            +---------------------------+
------->| "!" +----------->| any string including null |-------->
        +-----+            +---------------------------+
.END LITERAL
.TEST PAGE 12
.LITERAL

command files

        +-----+                   +-----------+
------->| "@" +------------+----->| FILE NAME |------+---------->
        +-----+            ^      +-----------+      |
                           |                         |
                           +<------------------------+
                           |                         |
                           |         +-----+         |
                           +<--------| "," |---------+
                                     +-----+
.END LITERAL
.TEST PAGE 12
.LITERAL

display

        +------------+         +-------------------+
------->|  "DISPLAY" |---+---->| DISPLAY PARAMETER |----+------->
        +------------+   ^     +-------------------+    |
                         |                              |
                         +<-----------------------------+
                         |                              |
                         |           +-----+            |
                         +<----------| "," |------------+
                                     +-----+
.END LITERAL
.TEST PAGE 25
.LITERAL

display parameter

        +------------+
---+--->|   "FILE"   |-------------------------------------+---->
   |    +------------+                                     |
   |                                                       |
   |    +------------+                                     |
   +--->|   "FILES"  |------------------------------------>+
   |    +------------+                                     |
   |                                                       |
   |    +------------+                                     |
   +--->|  "NOFILE"  |------------------------------------>+
   |    +------------+                                     |
   |                                                       |
   |    +------------+                                     |
   +--->|  "NOFILES" |------------------------------------>+
   |    +------------+                                     |
   |                                                       |
   |    +--------------+    +-----+                        |
   +--->|  "PRECISION" |--->| "=" |---+------------------->+
        +--------------+    +-----+   |                    |
                                      |   +-----------+    |
                                      +-->| PRECISION |--->+
                                          +-----------+
.END LITERAL
.TEST PAGE 6
.LITERAL

precision

        +---------+
------->| INTEGER |--------------------------------------------->
        +---------+
.END LITERAL
.TEST PAGE 6
.LITERAL

help

        +------------+     +---------------------------+
------->|   "HELP"   |---->| ANY STRING INCLUDING NULL |-------->
        +------------+     +---------------------------+
.END LITERAL
.TEST PAGE 8
.LITERAL

input

        +------------+     +-------------+     +----------+
------->|  "INPUT"   |--+->| I QUALIFIER |--+->| I PROMPT |----->
        +------------+  ^  +-------------+  |  +----------+
                        |                   |
                        +-------------------+
.END LITERAL
.TEST PAGE 16
.LITERAL

i qualifier

---+--------------------------------------------------------+--->
   |                                                        ^
   |   +-----+       +-----------+                          |
   +-->| "/" |-->+-->|  "FLOAT"  |------------------------->+
       +-----+   |   +-----------+                          |
                 |                                          |
                 |   +-----------+                          |
                 +-->| "INTEGER" |------------------------->+
                 |   +-----------+                          |
                 |                                          |
                 |   +-----------+   +-----+   +--------+   |
                 +-->| "DEFAULT" |-->| "=" |-->| NUMBER |-->+
                     +-----------+   +-----+   +--------+
.END LITERAL
.TEST PAGE 6
.LITERAL

i prompt

        +--------+   +---------------+
------->| SYMBOL |-->| QUOTED STRING |-------------------------->
        +--------+   +---------------+
.END LITERAL
.TEST PAGE 16
.LITERAL

show

        +------------+
------->|   "SHOW"   |---+------------------------------+------->
        +------------+   |                              ^
                         |        +------------+        |
                         +---+--->|   SYMBOL   |---+--->+
                             ^    +------------+   |
                             |                     |
                             +<--------------------+
                             |                     |
                             |       +-----+       |
                             +<------| "," |-------+
                                     +-----+
.END LITERAL
.TEST PAGE 6
.LITERAL

assignment

        +------------+        +-----+        +------------+
------->|   SYMBOL   |------->| "=" |------->| EXPRESSION |----->
        +------------+        +-----+        +------------+
.END LITERAL
.TEST PAGE 16
.LITERAL

expression

       +-----+
   +-->| "+" |---+
   |   +-----+   |
   |             V         +------------+
---+-------------+----+--->|    TERM    |------+----------+----->
   |             ^    ^    +------------+      |          |
   |   +-----+   |    |                        V          V
   +-->| "-" |---+    |                     +-----+    +-----+
       +-----+        |                     | "+" |    | "-" |
                      |                     +--+--+    +--+--+
                      |                        |          |
                      |                        |          |
                      +------------------------+----------+
.END LITERAL
.TEST PAGE 13
.LITERAL

term

        +------------+
---+--->|   FACTOR   |-----------+----------+------------------->
   ^    +------------+           |          |
   |                             V          V
   |                          +-----+    +-----+
   |                          | "*" |    | "/" |
   |                          +--+--+    +--+--+
   |                             |          |
   |                             |          |
   +-----------------------------+----------+
.END LITERAL
.TEST PAGE 18
.LITERAL

factor

        +------------+
---+--->|   NUMBER   |----------------------------------+------->
   |    +------------+                                  ^
   |                                                    |
   |    +------------+                                  |
   +--->|   SYMBOL   |--------------------------------->+
   |    +------------+                                  |
   |                                                    |
   |    +------------+      +--------------------+      |
   +--->|  FUNCTION  |----->| FUNCTION ARGUMENTS |----->+
   |    +------------+      +--------------------+      |
   |                                                    |
   |    +-----+       +------------+       +-----+      |
   +--->| "(" |------>| EXPRESSION |------>| ")" |----->+
        +-----+       +------------+       +-----+
.END LITERAL
.TEST PAGE 10
.LITERAL

function arguments   (the number is function dependent)

        +-----+       +------------+       +-----+
------->| "(" |--+--->| EXPRESSION |---+-->| ")" |-------------->
        +-----+  ^    +------------+   |   +-----+
                 |                     |
                 |       +-----+       |
                 +<------| "," |-------+
                         +-----+
.END LITERAL
.TEST PAGE 18
.LITERAL

number

        +----------------+
---+--->| DECIMAL NUMBER |-------------------------------+------>
   |    +----------------+                               ^
   |                                                     |
   |    +------+       +--------------------+            |
   +--->| "%O" |------>| octal number       |----------->+
   |    +------+       +--------------------+            |
   |                                                     |
   |    +------+       +--------------------+            |
   +--->| "%D" |------>| DECIMAL NUMBER     |----------->+
   |    +------+       +--------------------+            |
   |                                                     |
   |    +------+       +--------------------+            |
   +--->| "%X" |------>| hexadecimal number |----------->+
        +------+       +--------------------+
.END LITERAL
.TEST PAGE 14
.LITERAL

decimal number

        +---------+
---+--->| INTEGER |------------------------------------->+------>
   |    +---------+                                      |
   |                                                     |
   |    +-------------+                                  |
   +--->| REAL NUMBER |--------------------------------->+
   |    +-------------+                                  |
   |                                                     |
   |    +-------------+    +-----+    +----------+       |
   +--->| REAL NUMBER |--->| "E" |--->| EXPONENT |------>+
        +-------------+    +-----+    +----------+
.END LITERAL
.TEST PAGE 6
.LITERAL

real number

        +---------+    +-----+    +---------+
------->| INTEGER |--->| "." |--->| INTEGER |------------------->
        +---------+    +-----+    +---------+
.END LITERAL
.TEST PAGE 11
.LITERAL

exponent

       +-----+
   +-->| "+" |---+
   |   +-----+   |
   |             V         +---------+
---+-------------+-------->| INTEGER |-------------------------->
   |             ^         +---------+
   |   +-----+   |
   +-->| "-" |---+
       +-----+
.END LITERAL
.TEST PAGE 8
.LITERAL

integer

        +---------ANY-DECIMAL-DIGIT------------+
---+--->|              0 thru 9                |----+----------->
   ^    +--------------------------------------+    |
   |                                                |
   +------------------------------------------------+
.END LITERAL
.TEST PAGE 8
.LITERAL

quoted string

    +-----+        +--------------------------+       +-----+
--->| '"' |---+--->| ANY CHARACTER EXCEPT '"' |---+---| '"' |--->
    +-----+   ^    +--------------------------+   |   +-----+
              |                                   |
              +-----------------------------------+
.END LITERAL
.TEST PAGE 8
.LITERAL

string

        +-------------ANY-CHARACTER------------+
---+--->|    a thru z, A thru Z or 0 thru 9    |----+----------->
   ^    +--------------------------------------+    |
   |                                                |
   +------------------------------------------------+
.END LITERAL
.TEST PAGE 8
.LITERAL

symbol

        +-------------ANY-CHARACTER------------+
---+--->| a thru z, A thru Z, 0 thru 9, $ or _ |----+----------->
   ^    +--------------------------------------+    |
   |                                                |
   +------------------------------------------------+
.END LITERAL