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note description: "[ Access to command-line arguments. This class may be used as ancestor by classes needing its facilities. ]" library: "Free implementation of ELKS library" status: "See notice at end of class." legal: "See notice at end of class." date: "$Date: 2018-05-18 00:50:43 -0800 (Fri, 18 May 2018) $" revision: "$Revision: 101749 $" class interface ARGUMENTS create default_create -- Process instances of classes with no creation clause. -- (Default: do nothing.) -- (from ANY) feature -- Access argument (i: INTEGER_32): STRING_8 -- i-th argument of command that started system execution -- (the command name if i = 0) require index_large_enough: i >= 0 index_small_enough: i <= argument_count ensure instance_free: class argument_not_void: Result /= Void Argument_array: ARRAY [STRING_8] -- Array containing command name (position 0) and arguments ensure instance_free: class argument_array_not_void: Result /= Void argument_array_compare_objects: Result.object_comparison Command_line: STRING_8 -- Total command line ensure instance_free: class Result.count >= Command_name.count Command_name: STRING_8 -- Name of command that started system execution ensure instance_free: class definition: Result ~ argument (0) generating_type: TYPE [detachable ARGUMENTS] -- Type of current object -- (type of which it is a direct instance) -- (from ANY) ensure -- from ANY generating_type_not_void: Result /= Void generator: STRING_8 -- Name of current object's generating class -- (base class of the type of which it is a direct instance) -- (from ANY) ensure -- from ANY generator_not_void: Result /= Void generator_not_empty: not Result.is_empty feature -- Measurement argument_count: INTEGER_32 -- Number of arguments given to command that started -- system execution (command name does not count) ensure instance_free: class argument_count_positive: Result >= 0 feature -- Comparison frozen deep_equal (a: detachable ANY; b: like arg #1): BOOLEAN -- Are a and b either both void -- or attached to isomorphic object structures? -- (from ANY) ensure -- from ANY instance_free: class shallow_implies_deep: standard_equal (a, b) implies Result both_or_none_void: (a = Void) implies (Result = (b = Void)) same_type: (Result and (a /= Void)) implies (b /= Void and then a.same_type (b)) symmetric: Result implies deep_equal (b, a) frozen equal (a: detachable ANY; b: like arg #1): BOOLEAN -- Are a and b either both void or attached -- to objects considered equal? -- (from ANY) ensure -- from ANY instance_free: class definition: Result = (a = Void and b = Void) or else ((a /= Void and b /= Void) and then a.is_equal (b)) frozen is_deep_equal alias "≡≡≡" (other: ARGUMENTS): BOOLEAN -- Are Current and other attached to isomorphic object structures? -- (from ANY) require -- from ANY other_not_void: other /= Void ensure -- from ANY shallow_implies_deep: standard_is_equal (other) implies Result same_type: Result implies same_type (other) symmetric: Result implies other.is_deep_equal (Current) is_equal (other: ARGUMENTS): BOOLEAN -- Is other attached to an object considered -- equal to current object? -- (from ANY) require -- from ANY other_not_void: other /= Void ensure -- from ANY symmetric: Result implies other ~ Current consistent: standard_is_equal (other) implies Result frozen standard_equal (a: detachable ANY; b: like arg #1): BOOLEAN -- Are a and b either both void or attached to -- field-by-field identical objects of the same type? -- Always uses default object comparison criterion. -- (from ANY) ensure -- from ANY instance_free: class definition: Result = (a = Void and b = Void) or else ((a /= Void and b /= Void) and then a.standard_is_equal (b)) frozen standard_is_equal alias "" (other: ARGUMENTS): BOOLEAN -- Is other attached to an object of the same type -- as current object, and field-by-field identical to it? -- (from ANY) require -- from ANY other_not_void: other /= Void ensure -- from ANY same_type: Result implies same_type (other) symmetric: Result implies other.standard_is_equal (Current) feature -- Status report coalesced_character_option_value (o: CHARACTER_8): detachable STRING_8 -- The value, if any, specified for character option o on -- the command line. -- Defined as follows (where 'X' is the current 'option_sign' and -- 'xx' is an arbitrary, possibly empty sequence of characters): --   val if command line includes an argument of the form Xxxoval --   (this may be an empty string if argument is just Xxxo). --   Void otherwise. require o_non_null: o /= '%U' ensure instance_free: class coalesced_word_option_value (opt: STRING_8): detachable STRING_8 -- The value, if any, specified for word option opt on the -- command line. -- Defined as follows (where X is the current Option_sign): --   val if command line includes an argument of the form Xoptval --   (this may be an empty string if argument is just Xopt). --   Void otherwise. require opt_non_void: opt /= Void opt_meaningful: not opt.is_empty ensure instance_free: class conforms_to (other: ANY): BOOLEAN -- Does type of current object conform to type -- of other (as per Eiffel: The Language, chapter 13)? -- (from ANY) require -- from ANY other_not_void: other /= Void index_of_beginning_with_word_option (opt: STRING_8): INTEGER_32 -- Does command line specify argument beginning with word -- option opt and, if so, at what position? -- If one of the arguments in list of space-separated arguments -- is Xoptxx, where X is the current Option_sign, 'xx' -- is arbitrary, possibly empty sequence of characters, -- then index of this argument in list; -- else 0. require opt_non_void: opt /= Void opt_meaningful: not opt.is_empty ensure instance_free: class index_of_character_option (o: CHARACTER_8): INTEGER_32 -- Does command line specify character option o and, if so, -- at what position? -- If one of the space-separated arguments is of the form Xxxoyy, -- where X is the current Option_sign, xx and yy -- are arbitrary, possibly empty sequences of characters, -- then index of this argument in list of arguments; -- else 0. require o_non_null: o /= '%U' ensure instance_free: class index_of_word_option (opt: STRING_8): INTEGER_32 -- Does command line specify word option opt and, if so, -- at what position? -- If one of the arguments in list of space-separated arguments -- is Xopt, where X is the current Option_sign, -- then index of this argument in list; -- else 0. require opt_non_void: opt /= Void opt_meaningful: not opt.is_empty ensure instance_free: class Option_sign: CHARACTER_8_REF -- The character used to signal options on the command line. -- This can be '%U' if no sign is necessary for the argument -- to be an option -- Default is '-' ensure instance_free: class same_type (other: ANY): BOOLEAN -- Is type of current object identical to type of other? -- (from ANY) require -- from ANY other_not_void: other /= Void ensure -- from ANY definition: Result = (conforms_to (other) and other.conforms_to (Current)) separate_character_option_value (o: CHARACTER_8): detachable STRING_8 -- The value, if any, specified after character option o on -- the command line. -- This is one of the following (where X is the current -- Option_sign, xx and 'yy' are arbitrary, possibly empty -- sequences of characters): --   val if command line includes two consecutive arguments --   of the form Xxxoyy and val respectively. --   Empty string if command line includes argument Xxxoyy, which is --   either last argument or followed by argument starting with X. --   Void if there is no argument of the form Xxxoyy. require o_non_null: o /= '%U' ensure instance_free: class separate_word_option_value (opt: STRING_8): detachable STRING_8 -- The value, if any, specified after word option opt on the -- command line. -- This is one of the following (where X is the current Option_sign): --   val if command line includes two consecutive arguments --   of the form Xopt and val respectively. --   Empty string if command line includes argument Xopt, which is --   either last argument or followed by argument starting with X. --   Void if no Xopt argument. require opt_non_void: opt /= Void opt_meaningful: not opt.is_empty ensure instance_free: class feature -- Status setting set_option_sign (c: CHARACTER_8) -- Make c the option sign. -- Use'%U' if no sign is necessary for the argument to -- be an option ensure instance_free: class feature -- Duplication copy (other: ARGUMENTS) -- Update current object using fields of object attached -- to other, so as to yield equal objects. -- (from ANY) require -- from ANY other_not_void: other /= Void type_identity: same_type (other) ensure -- from ANY is_equal: Current ~ other frozen deep_copy (other: ARGUMENTS) -- Effect equivalent to that of: -- copy (other . deep_twin) -- (from ANY) require -- from ANY other_not_void: other /= Void ensure -- from ANY deep_equal: deep_equal (Current, other) frozen deep_twin: ARGUMENTS -- New object structure recursively duplicated from Current. -- (from ANY) ensure -- from ANY deep_twin_not_void: Result /= Void deep_equal: deep_equal (Current, Result) frozen standard_copy (other: ARGUMENTS) -- Copy every field of other onto corresponding field -- of current object. -- (from ANY) require -- from ANY other_not_void: other /= Void type_identity: same_type (other) ensure -- from ANY is_standard_equal: standard_is_equal (other) frozen standard_twin: ARGUMENTS -- New object field-by-field identical to other. -- Always uses default copying semantics. -- (from ANY) ensure -- from ANY standard_twin_not_void: Result /= Void equal: standard_equal (Result, Current) frozen twin: ARGUMENTS -- New object equal to Current -- twin calls copy; to change copying/twinning semantics, redefine copy. -- (from ANY) ensure -- from ANY twin_not_void: Result /= Void is_equal: Result ~ Current feature -- Basic operations frozen default: detachable ARGUMENTS -- Default value of object's type -- (from ANY) frozen default_pointer: POINTER -- Default value of type POINTER -- (Avoid the need to write p.default for -- some p of type POINTER.) -- (from ANY) ensure -- from ANY instance_free: class default_rescue -- Process exception for routines with no Rescue clause. -- (Default: do nothing.) -- (from ANY) frozen do_nothing -- Execute a null action. -- (from ANY) ensure -- from ANY instance_free: class feature -- Access: Cursor new_cursor: ITERATION_CURSOR [STRING_8] -- Fresh cursor associated with current structure require -- from ITERABLE True ensure -- from ITERABLE result_attached: Result /= Void ensure then instance_free: class feature -- Output Io: STD_FILES -- Handle to standard file setup -- (from ANY) ensure -- from ANY instance_free: class io_not_void: Result /= Void out: STRING_8 -- New string containing terse printable representation -- of current object -- (from ANY) ensure -- from ANY out_not_void: Result /= Void print (o: detachable ANY) -- Write terse external representation of o -- on standard output. -- (from ANY) ensure -- from ANY instance_free: class frozen tagged_out: STRING_8 -- New string containing terse printable representation -- of current object -- (from ANY) ensure -- from ANY tagged_out_not_void: Result /= Void feature -- Platform Operating_environment: OPERATING_ENVIRONMENT -- Objects available from the operating system -- (from ANY) ensure -- from ANY instance_free: class operating_environment_not_void: Result /= Void invariant argument_array_consistent: Argument_array ~ internal_argument_array -- from ANY reflexive_equality: standard_is_equal (Current) reflexive_conformance: conforms_to (Current) note copyright: "Copyright (c) 1984-2018, Eiffel Software and others" license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)" source: "[ Eiffel Software 5949 Hollister Ave., Goleta, CA 93117 USA Telephone 805-685-1006, Fax 805-685-6869 Website http://www.eiffel.com Customer support http://support.eiffel.com ]" end -- class ARGUMENTS
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