76 lines
1.9 KiB
Elixir
76 lines
1.9 KiB
Elixir
% ## String and Char lists
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%
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% In Elixir, we have both strings and char lists. They are two ways to
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% represent the same thing, the choice is just a matter of which API
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% you want to use. A String will be mapped to the String object while
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% the char list to the List object.
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%
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% It is important to notice that if you need to interact with an Erlang
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% method, you need to pass a to_char_list as Erlang does not understand
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% the string representation from Elixir.
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%
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% For this reason, just String and List implement the to_char_list
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% method to avoid implicit conversion of other data types. General
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% conversion to string happens through the to_s method. Which is
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% implemented in all objects (unless explicitly undefined).
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%
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object String
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% Initializes a string by keeping its internal list representation.
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def constructor(bin)
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{ 'bin: bin.to_bin }
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end
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% Concatenate two strings.
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%
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% ## Examples
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%
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% "eli" + "xir" % => "elixir"
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%
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def +(another)
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String.new Erlang.elixir_string_methods.add(@bin, another.to_bin)
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end
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% Returns the length of the string. All strings parsed by the
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% interpreter are handled as utf-8. Any I/O driver should be
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% responsible to convert to utf-8.
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%
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% ## Examples
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%
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% "elixir".length % => 6
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% "josé".length % => 4
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%
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def length
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Erlang.erlang.length(Erlang.unicode.characters_to_list(@bin, 'utf8))
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end
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% Returns the list representation of this String.
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def to_list
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Erlang.binary_to_list @bin
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end
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% Returns the list of chars represantion of this String.
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def to_char_list
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Erlang.binary_to_list @bin
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end
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% Returns a string representation of this string.
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%
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% ## Examples
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%
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% "elixir".inspect % => "\"elixir\""
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%
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% TODO Which one is better [$"|@list] + [$"] or "\"#{@list}\""?
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def inspect
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String.new ~Q("#{@bin}")
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end
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def to_bin
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@bin
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end
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% Returns the string itself.
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def to_s
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self
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end
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end
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