selectively
v2.0.13
Published
Create selection by filtering a collection.
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template-library
Template for NPM library.
Selectively Grammar
Symbols
- bool-expr (boolean expression)
- prop (property, identifier (id) or combination of identifiers, e.g. identifier.identifier (id.id))
- id (identifier)
- expr (expression)
- expr-op (expression operator e.g. >, <, >=, <=)
- alg-expr (algebraic expression)
- bin-op (binary operator)
Production Rules
Boolean Rules:
- bool-expr -> prop ":" expr | prop expr-op expr | (bool-expr) | bool-expr "|" bool-expr | bool-expr bool-expr | !bool-expr
- prop -> prop "." id | id
- expr -> prop | string | alg-expr | (expr) | "!"expr | expr "|" expr
- expr-op -> < | > | <= | >=
Algebraic Rules:
- alg-expr -> number | alg-expr bin-op alg-expr | (alg-expr)
- bin-op -> + | - | / | *
Merchant Rules
All id could be id.id.id...
Allowed Strings
id>num
id<=str
!(id:str)
id:(str | str)
id:((str | str) | str)
(id<num)
id:num
id:!num
id:!(num | num)
id:(num | !num)
id:id
id>id
(((id>num)))
(id>(num))
id.id:(id.id | str | num) | id.id.id:id.id
id>num + num
id<= num + (num * num) / num - num
Disallowed Strings
Open brackets:
(((id>num))
Mix of prop ":" expr and prop expr-op expr
id:(id>num)
Special Rules
prop expr-op expr
Left-hand side:
Can be ambiguous, e.g. amount, where amount is an identifier which can be found as a property on several properties.
Right-hand side:
Can't be ambiguous, it must refer to a string, number or a unique identifier, e.g. "uniqueIdentifier.amount". An ambiguous identifier will be interpreted as a string.
What is What?
- 3.14 => number
- identifier | identifier.identifier => property or properties
- unique_identifier.identifier => property
- .identifier => property if the identifier is a property of the base object, otherwise string.
- 1.B2 => string
- card.3d.secure => property
- 20-12-24 => string
- 20 - 12 - 24 => algebraic expression (uses whitespaces around the operators.)
- "20 - 12 - 24" => string. ("" forces an)
- Violation of the rules gives red underlining.