Expression syntax

12.1 Expression syntax

An expression applies relational operators to simple expressions. Simple expressions are a series of terms (what a term is, is explained below), joined by adding operators.

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Expressions

-- - -|--------------------------------------
expression simple expression |-- *-- simple expression-|
-<= |
- >-|
|>= |
| =-|
|<> |
|in |
-is -

--simple expression-|-term ------------------------------------------
-|-+ ----
|-- --|
|-or--|
-xor -
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The following are valid expressions:

GraphResult<>grError
(DoItToday=Yes) and (DoItTomorrow=No);
Day in Weekend

And here are some simple expressions:

A + B
-Pi
ToBe or NotToBe

Terms consist of factors, connected by multiplication operators.

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Terms

--term ----factor-------------------------------------------------
-|--* ---|
|--/ --|
|-div --|
|mod --|
|-and --|
--shl--|
--shr--|
as
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Here are some valid terms:

2 * Pi
A Div B
(DoItToday=Yes) and (DoItTomorrow=No);

Factors are all other constructions:

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Factors

--factor---(- expression -) ----------------------------------------
|variable reference-|
|--function call--|
|unsigned constant -|
|--not- factor ---|
|--sign- factor---|
--set constructor---|
--value typecast---|
address factor

--unsigned constant-|unsigned number-------------------------------
--character string--|
-constant identifier--|
Nil
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