From ftm
(→Values and Lists) |
(→Values and Lists) |
||
| Line 12: | Line 12: | ||
* a simple value (int, float, symbol) | * a simple value (int, float, symbol) | ||
* a named value such as $x or $myobj or $myconst | * a named value such as $x or $myobj or $myconst | ||
| − | * an element | + | * an element of an object |
Examples of simple values are | Examples of simple values are | ||
| Line 25: | Line 25: | ||
* -thirteen ... a symbol | * -thirteen ... a symbol | ||
| − | Named values are defined by | + | Named values are defined by FTM definitions using ''ftm.object''. The names are used in expressions with a leading dollar, '$', making for example: |
| + | * $x | ||
| + | * $myobject | ||
| + | |||
| + | FTM definitions always associate a single value (int, float, symbol, reference to an FTM object) to a name. | ||
== Parenthesis == | == Parenthesis == | ||
Revision as of 13:14, 6 June 2007
FTM expressions are used in the following contexts
- the FTM message box (ftm.mess)
- the FTM definition (ftm.object)
- the expr class/object
The syntax is basically always the same appart from minor context dependent details.
Values and Lists
The values of FTM expressions can be int, float, symbol or references to FTM object. They values can be represended by the following terms:
- a simple value (int, float, symbol)
- a named value such as $x or $myobj or $myconst
- an element of an object
Examples of simple values are
- 1 ... an int
- -2 ... an int
- 2.3 ... a float
- -4. ... a loat
- 5.67e-4 ... a float
- .89 ... a float
- ten ... a symbol
- 11-12 ... a symbol (because no space!)
- -thirteen ... a symbol
Named values are defined by FTM definitions using ftm.object. The names are used in expressions with a leading dollar, '$', making for example:
- $x
- $myobject
FTM definitions always associate a single value (int, float, symbol, reference to an FTM object) to a name.
Parenthesis
Parenthesis in FTM expressions, '(' and ')', always will (try to) evaluate the contained elements to a single value.
Inside parenthesis you'd have either one
- a value (in which case the parenthesis are useless)
- a simple infix expression
- a simple prefix expression