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floki
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Floki is a simple HTML parser that enables search for nodes using CSS selectors.
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lib/floki/selector/attribute_selector.ex
defmodule Floki.Selector.AttributeSelector do
@moduledoc false
# It is very similar to the `Selector` module, but is specialized in attributes
# and attribute selectors.
alias Floki.Selector.AttributeSelector
defstruct match_type: nil, attribute: nil, value: nil
defimpl String.Chars do
def to_string(selector) do
"[#{selector.attribute}#{type(selector.match_type)}'#{selector.value}']"
end
defp type(match_type) do
case match_type do
:equal -> "="
:includes -> "~="
:dash_match -> "|="
:prefix_match -> "^="
:sufix_match -> "$="
:substring_match -> "*="
_ -> ""
end
end
end
# Returns if attributes of a node matches with a given attribute selector.
def match?(attributes, s = %AttributeSelector{match_type: nil, value: nil}) do
attribute_present?(s.attribute, attributes)
end
def match?(attributes, s = %AttributeSelector{match_type: :equal}) do
get_value(s.attribute, attributes) == s.value
end
def match?(attributes, s = %AttributeSelector{match_type: :includes}) do
value = get_value(s.attribute, attributes)
whitespace_values = String.split(value, " ")
Enum.any?(whitespace_values, fn v -> v == s.value end)
end
def match?(attributes, s = %AttributeSelector{match_type: :dash_match}) do
value = get_value(s.attribute, attributes)
value == s.value || String.starts_with?(value, "#{s.value}-")
end
def match?(attributes, s = %AttributeSelector{match_type: :prefix_match}) do
s.attribute |> get_value(attributes) |> String.starts_with?(s.value)
end
def match?(attributes, s = %AttributeSelector{match_type: :sufix_match}) do
s.attribute |> get_value(attributes) |> String.ends_with?(s.value)
end
def match?(attributes, s = %AttributeSelector{match_type: :substring_match}) do
s.attribute |> get_value(attributes) |> String.contains?(s.value)
end
defp get_value(attr_name, attributes) do
{_attr_name, value} =
Enum.find(attributes, {attr_name, ""}, fn {k, _v} ->
k == attr_name
end)
value
end
defp attribute_present?(name, attributes) do
Enum.any?(attributes, fn {k, _v} -> k == name end)
end
end