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@looker/filter-expressions
Advanced tools
This TypeScript package provides the necessary functions for transforming [Looker filter expressions](https://cloud.google.com/looker/docs/reference/filter-expressions) into data structures and localized text summaries – and vice versa.
This TypeScript package provides the necessary functions for transforming Looker filter expressions into data structures and localized text summaries – and vice versa.
getExpressionType
Returns a valid filter expression type when given the type and field properties of an IDashboardFilter
object as defined in @looker/sdk
.
getExpressionType({ field: { is_numeric: true }, type: 'field_filter' });
// 'number'
parseFilterExpression
Returns an Abstract Syntax Tree (AST) that logically represents the filter expression string passed in, as well as the filter expression type (and optional user attributes).
parseFilterExpression('number', '[0,20],>30');
// {
// type: ',',
// left: {
// type: 'between',
// bounds: '[]',
// low: 0,
// high: 20,
// is: true,
// },
// right: {
// is: true,
// type: '>',
// value: [30],
// },
// }
summary
The summary
function returns a localized, human-readable summary of a filter expression, given the expression's type, the expression itself, and the user attributes and field, if applicable.
summary('number', '[0,20],>30');
// 'is in range [0, 20] or is > 30'
typeToGrammar
Returns an object with utility functions and values pertaining to a given expression type:
toString
: a function that converts an AST into an expression of the given typesubTypes
: an array containing the sub-types of the expression type, for example ">", "<", "=", "between", etc, for a number expression typegetFilterTokenItem
Converts an AST to a single item for use in a token (i.e. not advanced) filter.
FAQs
This TypeScript package provides the necessary functions for transforming [Looker filter expressions](https://cloud.google.com/looker/docs/reference/filter-expressions) into data structures and localized text summaries – and vice versa.
The npm package @looker/filter-expressions receives a total of 556 weekly downloads. As such, @looker/filter-expressions popularity was classified as not popular.
We found that @looker/filter-expressions demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 10 open source maintainers collaborating on the project.
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