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Localization (parsing, formatting) of numbers, dates/time/calendar, units of measure, messages and lists. Includes localized collation.
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lib/localize/number/plural_rules/compiler.ex
defmodule Localize.Number.PluralRule.Compiler do
@moduledoc false
# Compiles CLDR plural rule definitions into Elixir AST.
#
# Uses the Erlang leex lexer (`:plural_rules_lexer`) and yecc parser
# (`:plural_rules_parser`) to tokenize and parse rule definitions
# from the ICU/CLDR plural rules syntax.
@doc """
Tokenize a plural rule definition.
Uses the leex lexer to tokenize a CLDR plural rule definition
string into a list of tokens.
### Arguments
* `definition` is a CLDR plural rule definition string.
### Returns
* `{:ok, tokens, end_line}` on success.
* `{:error, reason}` on failure.
"""
def tokenize(definition) when is_binary(definition) do
definition
|> String.to_charlist()
|> :plural_rules_lexer.string()
end
@doc """
Parse a plural rule definition.
Using the yecc parser, parse a rule definition into an Elixir
AST that can then be `unquoted` into a function definition.
### Arguments
* `tokens` is a list of tokens from `tokenize/1`, or a binary
rule definition string.
### Returns
* `{:ok, ast}` on success.
* `{:error, reason}` on failure.
"""
def parse(tokens) when is_list(tokens) do
:plural_rules_parser.parse(tokens)
end
def parse(definition) when is_binary(definition) do
{:ok, tokens, _end_line} = tokenize(definition)
:plural_rules_parser.parse(tokens)
end
end