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A Excel like expression parser, compatible with FLOIP Expression language.
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lib/expression/callbacks/eval_helpers.ex
defmodule Expression.Callbacks.EvalHelpers do
@moduledoc false
@doc """
Evaluate the given AST against the context and return the value
after evaluation. If `with_defaults` is true (the default), then
the value after evaluation is converted to its default value, which
is the value as is for non complex fields, and the `__value__` key for
complex fields.
"""
@spec eval!(term, map) :: term
def eval!(ast, ctx, with_defaults \\ true) do
result = Expression.Eval.eval!(ast, ctx)
result =
if with_defaults do
Expression.Eval.default_value(result)
else
result
end
Expression.Eval.not_founds_as_nil(result)
end
@doc """
Evaluate the given AST values against the context and return the
values after evaluation.
"""
@spec eval_args!([term], map) :: [term]
def eval_args!(args, ctx), do: Enum.map(args, &eval!(&1, ctx))
end