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Diffstat (limited to 'old-docs/syntax-define.mdwn')
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diff --git a/old-docs/syntax-define.mdwn b/old-docs/syntax-define.mdwn new file mode 100644 index 0000000..579fe44 --- /dev/null +++ b/old-docs/syntax-define.mdwn @@ -0,0 +1,31 @@ +Lace - Syntax of definition statements +====================================== + +Definition statements start with one of `def` or `define`. They may +also start `acl` to look more squiddish. + +The rough syntax of a definition statement is: + + define <name> <controltype> <0-or-more-args> + +for example: + + define is-admin is-in-group administrators + +There are some loose constraints on the name and controltype +arguments. The name SHOULD NOT contain quote characters and MUST NOT +start with an exclamation point. The controltype simply SHOULD NOT +contain quotes. + +The control types are typically provided by the program which is using +Lace. However Lace does provide some simple control types which can +be useful and callers are welcome to add them to their engines. + +The two simple control types Lace provides are the `allof` and `anyof` +controls. They, as their arguments, take two or more rule names and match if +all or any (respectively) of their arguments resolve to true. As with other +parts of Lace, if the rule names are prefixed by exclamation points then their +result is inverted before being tested. + +These give you ways to produce common subexpressions of the 'AND' and +'OR' forms to be used in later rules. |