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argv.cr
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argv.cr
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# An `ACON::Input::Interface` based on [ARGV](https://crystal-lang.org/api/toplevel.html#ARGV).
class Athena::Console::Input::ARGV < Athena::Console::Input
@tokens : Array(String)
@parsed : Array(String) = [] of String
def initialize(@tokens : Array(String) = ::ARGV, definition : ACON::Input::Definition? = nil)
super definition
end
# :inherit:
# ameba:disable Metrics/CyclomaticComplexity
def first_argument : String?
is_option = false
@tokens.each_with_index do |token, idx|
if !token.empty? && token.starts_with? '-'
next if token.includes?('=') || @tokens[idx + 1]?.nil?
name = '-' == token.char_at(1) ? token[2..] : token[-1..]
if !@options.has_key?(name) && !@definition.has_shortcut?(name)
# noop
elsif (@options.has_key?(name) || @options.has_key?(name = @definition.shortcut_to_name(name))) && @tokens[idx + 1]? == @options[name].value
is_option = true
end
next
end
if is_option
is_option = false
next
end
return token
end
nil
end
# :inherit:
def has_parameter?(*values : String, only_params : Bool = false) : Bool
@tokens.each do |token|
return false if only_params && "--" == token
values.each do |value|
leading = value.starts_with?("--") ? "#{value}=" : value
return true if token == value || (!leading.empty? && token.starts_with? leading)
end
end
false
end
# :inherit:
def parameter(value : String, default : _ = false, only_params : Bool = false)
tokens = @tokens.dup
while token = tokens.shift?
return default if only_params && "--" == token
return tokens.shift? if token == value
leading = value.starts_with?("--") ? "#{value}=" : value
return token[leading.size..] if !leading.empty? && token.starts_with? leading
end
default
end
# ameba:disable Metrics/CyclomaticComplexity
protected def parse : Nil
parse_options = true
@parsed = @tokens.dup
while token = @parsed.shift?
if parse_options && token.empty?
self.parse_argument token
elsif parse_options && "--" == token
parse_options = false
elsif parse_options && token.starts_with? "--"
self.parse_long_option token
elsif parse_options && token.starts_with?('-') && "-" != token
self.parse_short_option token
else
self.parse_argument token
end
end
end
private def parse_argument(token : String) : Nil
count = @arguments.size
# If expecting another argument, add it.
if @definition.has_argument? count
argument = @definition.argument count
@arguments[argument.name] = argument.is_array? ? ACON::Input::Value::Array.new(token) : ACON::Input::Value.from_value token
# If the last argument IS_ARRAY, append token to last argument.
elsif @definition.has_argument?(count - 1) && @definition.argument(count - 1).is_array?
argument = @definition.argument(count - 1)
@arguments[argument.name].as(ACON::Input::Value::Array) << token
# TODO: Handle unexpected argument.
else
end
end
private def parse_long_option(token : String) : Nil
name = token.lchop "--"
if pos = name.index '='
if (value = name[(pos + 1)..]).empty?
@parsed.unshift value
end
self.add_long_option name[0, pos], value
else
self.add_long_option name, nil
end
end
# ameba:disable Metrics/CyclomaticComplexity
private def add_long_option(name : String, value : String?) : Nil
unless @definition.has_option?(name)
raise ACON::Exceptions::InvalidOption.new "The '--#{name}' option does not exist." unless @definition.has_negation? name
option_name = @definition.negation_to_name name
raise ACON::Exceptions::InvalidOption.new "The '--#{name}' option does not accept a value." unless value.nil?
return @options[option_name] = ACON::Input::Value.from_value false
end
option = @definition.option name
if !value.nil? && !option.accepts_value?
raise ACON::Exceptions::InvalidOption.new "The --#{option.name} option does not accept a value."
end
if value.in?("", nil) && option.accepts_value? && !@parsed.empty?
next_value = @parsed.shift?
if ((v = next_value.presence) && '-' != v.char_at(0)) || next_value.in?("", nil)
value = next_value
else
@parsed.unshift next_value || ""
end
end
if value.nil?
raise ACON::Exceptions::InvalidOption.new "The --#{option.name} option requires a value." if option.value_required?
value = true if !option.is_array? && !option.value_optional?
end
if option.is_array?
(@options[name] ||= ACON::Input::Value::Array.new).as(ACON::Input::Value::Array) << value
else
@options[name] = ACON::Input::Value.from_value value
end
end
private def parse_short_option(token : String) : Nil
name = token.lchop '-'
if name.size > 1
if @definition.has_shortcut?(name[0]) && @definition.option_for_shortcut(name[0]).accepts_value?
# Option with a value & no space
self.add_short_option name[0], name[1..]
else
self.parse_short_option_set name
end
else
self.add_short_option name, nil
end
end
private def parse_short_option_set(name : String) : Nil
length = name.size
name.each_char_with_index do |char, idx|
raise ACON::Exceptions::InvalidOption.new "The -#{char} option does not exist." unless @definition.has_shortcut? char
option = @definition.option_for_shortcut char
if option.accepts_value?
self.add_long_option option.name, idx == length - 1 ? nil : name[(idx + 1)..]
break
else
self.add_long_option option.name, nil
end
end
end
private def add_short_option(name : String | Char, value : String?) : Nil
name = name.to_s
raise ACON::Exceptions::InvalidOption.new "The -#{name} option does not exist." if !@definition.has_shortcut? name
self.add_long_option @definition.option_for_shortcut(name).name, value
end
end