Expression.Eval (expression v2.23.9)
Expression.Eval is responsible for taking an abstract syntax tree (AST) as generated by Expression.Parser and evaluating it.
At a high level, an AST consists of a Keyword list with two top-level
keys, either :text or :expression.
Expression.Eval.eval!/3 will return the output for each entry in the Keyword
list. :text entries are returned as regular strings. :expression entries
are returned as typed values.
The returned value is a list containing each.
Example
iex(1)> Expression.Eval.eval!([text: "hello"], %{})
["hello"]
iex(2)> Expression.Eval.eval!([text: "hello", expression: [literal: 1]], %{})
["hello", 1]
iex(3)> Expression.Eval.eval!([
...(3)> text: "hello",
...(3)> expression: [literal: 1],
...(3)> text: "ok",
...(3)> expression: [literal: true]
...(3)> ], %{})
["hello", 1, "ok", true]Link to this section Summary
Functions
Return the default value for a potentially complex value.
Link to this section Functions
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default_value(val, opts \\ [])
Return the default value for a potentially complex value.
Complex values can be Maps that have a __value__ key, if that's
returned then we can to use the __value__ value when eval'ing against
operators or functions.
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eval!(ast, context, mod \\ Expression.Callbacks)
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handle_not_found(value)
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not_founds_as_nil(other)
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