From ftm
(→Parenthesis) |
(→Values and Lists) |
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They values can be represended by the following terms: | They values can be represended by the following terms: | ||
* a simple value (int, float, symbol) | * a simple value (int, float, symbol) | ||
| − | * a named value | + | * a named value |
* an element of an object | * an element of an object | ||
| + | === Simple Values === | ||
Examples of simple values are | Examples of simple values are | ||
* 1 ... an int | * 1 ... an int | ||
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* -thirteen ... a symbol | * -thirteen ... a symbol | ||
| + | === Named Values === | ||
Named values are defined by FTM definitions using ''ftm.object''. | Named values are defined by FTM definitions using ''ftm.object''. | ||
The names, always representing a single value, are used in expressions with a leading dollar – '$' – making for example: | The names, always representing a single value, are used in expressions with a leading dollar – '$' – making for example: | ||
* $x | * $x | ||
* $myobject | * $myobject | ||
| + | |||
| + | An element | ||
== Parenthesis == | == Parenthesis == | ||
Revision as of 13:18, 6 June 2007
FTM expressions are used in the following contexts
- the FTM message box (ftm.mess)
- the FTM definition (ftm.object)
- the expr class/object
The syntax is basically always the same appart from minor context dependent details.
Values and Lists
The values of FTM expressions can be int, float, symbol or references to FTM object. They values can be represended by the following terms:
- a simple value (int, float, symbol)
- a named value
- an element of an object
Simple Values
Examples of simple values are
- 1 ... an int
- -2 ... an int
- 2.3 ... a float
- -4. ... a loat
- 5.67e-4 ... a float
- .89 ... a float
- ten ... a symbol
- 11-12 ... a symbol (because no space!)
- -thirteen ... a symbol
Named Values
Named values are defined by FTM definitions using ftm.object. The names, always representing a single value, are used in expressions with a leading dollar – '$' – making for example:
- $x
- $myobject
An element
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