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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-------------------------------- ---string-literal----| -constant-identifier--| Nil

--variable- reference- fully-qualified- identifier------------------------------
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