Definitions of Boolean Expressions


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This section describes, in detail, the expressions accepted by the Boolean compilation function, and explains how each expression is evaluated.

The following standard C language operators are not supported:

The following table shows the Backus-Naur Form definitions of the accepted Boolean expressions.

Expression	Definition
<boolean>	<boolean> \|\| <logical and> \| <logical and>
<logical and>	<logical and> && <xor expr> \| <xor expr>
<xor expr>	<xor expr> ^ <equality expr> \| <equality expr>
<equality expr>	<equality expr> <eq op> <relational expr> \| <relational expr>
<eq op>	== \| != \| %% \| !%
<relational expr>	<relational expr> <rel op> <additive expr> \| <additive expr>
<rel op>	< \| <= \| >= \| > \|
<additive expr>	<additive expr> <add op> <multiplicative expr> \| <multiplicative expr>
<add op>	+ \| -
<multiplicative expr>	<multiplicative expr> <mult op> <unary expr> \| <unary expr>
<mult op>	* \| / \| %
<unary expr>	<unary op> <primary expr> \| <primary expr>
<unary op>	+ \| - \| ~ \| !
<primary expr>	( <boolean> ) \| <unsigned constant> \| <field ref>
<unsigned constant>	<unsigned number> \| <string>
<unsigned number>	<unsigned float> \| <unsigned int>
<string>	' <character> {<character>. . .} '
<field ref>	<field name> \| <field name>[<field occurrence>]
<field occurrence>	<unsigned int> \| <meta>
<meta>	?

The following sections describe Boolean expressions in greater detail.