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413 lines
10 KiB
Text
413 lines
10 KiB
Text
---[[
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LuCI utility functions.
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]]
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module "luci.util"
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---[[
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Create a Class object (Python-style object model).
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The class object can be instantiated by calling itself.
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Any class functions or shared parameters can be attached to this object.
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Attaching a table to the class object makes this table shared between
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all instances of this class. For object parameters use the __init__ function.
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Classes can inherit member functions and values from a base class.
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Class can be instantiated by calling them. All parameters will be passed
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to the __init__ function of this class - if such a function exists.
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The __init__ function must be used to set any object parameters that are not shared
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with other objects of this class. Any return values will be ignored.
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@class function
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@name class
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@param base The base class to inherit from (optional)
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@return A class object
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@see instanceof
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@see clone
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]]
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---[[
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Test whether the given object is an instance of the given class.
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@class function
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@name instanceof
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@param object Object instance
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@param class Class object to test against
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@return Boolean indicating whether the object is an instance
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@see class
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@see clone
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]]
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---[[
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Create a new or get an already existing thread local store associated with
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the current active coroutine.
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A thread local store is private a table object
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whose values can't be accessed from outside of the running coroutine.
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@class function
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@name threadlocal
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@return Table value representing the corresponding thread local store
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]]
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---[[
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Write given object to stderr.
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@class function
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@name perror
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@param obj Value to write to stderr
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@return Boolean indicating whether the write operation was successful
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]]
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---[[
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Recursively dumps a table to stdout, useful for testing and debugging.
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@class function
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@name dumptable
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@param t Table value to dump
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@param maxdepth Maximum depth
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@return Always nil
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]]
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---[[
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Create valid XML PCDATA from given string.
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@class function
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@name pcdata
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@param value String value containing the data to escape
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@return String value containing the escaped data
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]]
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---[[
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Decode an URL-encoded string - optionally decoding the "+" sign to space.
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@class function
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@name urldecode
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@param str Input string in x-www-urlencoded format
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@param decode_plus Decode "+" signs to spaces if true (optional)
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@return The decoded string
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@see urlencode
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]]
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---[[
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URL-encode given string.
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@class function
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@name urlencode
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@param str String to encode
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@return String containing the encoded data
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@see urldecode
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]]
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---[[
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Strip HTML tags from given string.
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@class function
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@name striptags
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@param value String containing the HTML text
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@return String with HTML tags stripped of
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]]
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---[[
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Safely quote value for use in shell commands.
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@class function
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@name shellquote
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@param value String containing the value to quote
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@return Single-quote enclosed string with embedded quotes escaped
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]]
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---[[
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Splits given string on a defined separator sequence and return a table
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containing the resulting substrings.
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The optional max parameter specifies the number of bytes to process,
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regardless of the actual length of the given string. The optional last
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parameter, regex, specifies whether the separator sequence is
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nterpreted as regular expression.
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@class function
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@name split
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@param str String value containing the data to split up
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@param pat String with separator pattern (optional, defaults to "\n")
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@param max Maximum times to split (optional)
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@param regex Boolean indicating whether to interpret the separator
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-- pattern as regular expression (optional, default is false)
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@return Table containing the resulting substrings
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]]
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---[[
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Remove leading and trailing whitespace from given string value.
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@class function
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@name trim
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@param str String value containing whitespace padded data
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@return String value with leading and trailing space removed
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]]
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---[[
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Count the occurrences of given substring in given string.
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@class function
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@name cmatch
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@param str String to search in
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@param pattern String containing pattern to find
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@return Number of found occurrences
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]]
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---[[
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Return a matching iterator for the given value.
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The iterator will return one token per invocation, the tokens are separated by
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whitespace. If the input value is a table, it is transformed into a string first.
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A nil value will result in a valid iterator which aborts with the first invocation.
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@class function
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@name imatch
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@param val The value to scan (table, string or nil)
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@return Iterator which returns one token per call
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]]
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---[[
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Parse certain units from the given string and return the canonical integer
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value or 0 if the unit is unknown.
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Upper- or lower case is irrelevant.
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Recognized units are:
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-- o "y" - one year (60*60*24*366)
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o "m" - one month (60*60*24*31)
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o "w" - one week (60*60*24*7)
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o "d" - one day (60*60*24)
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o "h" - one hour (60*60)
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o "min" - one minute (60)
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o "kb" - one kilobyte (1024)
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o "mb" - one megabyte (1024*1024)
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o "gb" - one gigabyte (1024*1024*1024)
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o "kib" - one si kilobyte (1000)
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o "mib" - one si megabyte (1000*1000)
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o "gib" - one si gigabyte (1000*1000*1000)
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@class function
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@name parse_units
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@param ustr String containing a numerical value with trailing unit
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@return Number containing the canonical value
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]]
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---[[
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Appends numerically indexed tables or single objects to a given table.
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@class function
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@name append
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@param src Target table
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@param ... Objects to insert
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@return Target table
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]]
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---[[
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Combines two or more numerically indexed tables and single objects into one table.
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@class function
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@name combine
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@param tbl1 Table value to combine
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@param tbl2 Table value to combine
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@param ... More tables to combine
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@return Table value containing all values of given tables
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]]
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---[[
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Checks whether the given table contains the given value.
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@class function
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@name contains
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@param table Table value
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@param value Value to search within the given table
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@return Number indicating the first index at which the given value occurs
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-- within table or false.
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]]
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---[[
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Update values in given table with the values from the second given table.
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Both table are - in fact - merged together.
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@class function
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@name update
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@param t Table which should be updated
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@param updates Table containing the values to update
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@return Always nil
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]]
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---[[
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Retrieve all keys of given associative table.
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@class function
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@name keys
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@param t Table to extract keys from
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@return Sorted table containing the keys
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]]
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---[[
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Clones the given object and return it's copy.
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@class function
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@name clone
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@param object Table value to clone
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@param deep Boolean indicating whether to do recursive cloning
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@return Cloned table value
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]]
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---[[
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Recursively serialize given data to lua code, suitable for restoring
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with loadstring().
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@class function
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@name serialize_data
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@param val Value containing the data to serialize
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@return String value containing the serialized code
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@see restore_data
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@see get_bytecode
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]]
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---[[
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Restore data previously serialized with serialize_data().
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@class function
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@name restore_data
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@param str String containing the data to restore
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@return Value containing the restored data structure
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@see serialize_data
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@see get_bytecode
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]]
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---[[
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Return the current runtime bytecode of the given data. The byte code
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will be stripped before it is returned.
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@class function
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@name get_bytecode
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@param val Value to return as bytecode
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@return String value containing the bytecode of the given data
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]]
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---[[
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Strips unnecessary lua bytecode from given string.
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Information like line numbers and debugging numbers will be discarded.
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Original version by Peter Cawley (http://lua-users.org/lists/lua-l/2008-02/msg01158.html)
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@class function
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@name strip_bytecode
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@param code String value containing the original lua byte code
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@return String value containing the stripped lua byte code
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]]
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---[[
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Return a key, value iterator which returns the values sorted according to
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the provided callback function.
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@class function
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@name spairs
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@param t The table to iterate
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@param f A callback function to decide the order of elements
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@return Function value containing the corresponding iterator
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]]
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---[[
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Return a key, value iterator for the given table.
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The table pairs are sorted by key.
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@class function
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@name kspairs
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@param t The table to iterate
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@return Function value containing the corresponding iterator
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]]
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---[[
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Return a key, value iterator for the given table.
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The table pairs are sorted by value.
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@class function
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@name vspairs
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@param t The table to iterate
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@return Function value containing the corresponding iterator
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]]
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---[[
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Test whether the current system is operating in big endian mode.
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@class function
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@name bigendian
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@return Boolean value indicating whether system is big endian
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]]
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---[[
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Execute given commandline and gather stdout.
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@class function
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@name exec
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@param command String containing command to execute
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@return String containing the command's stdout
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]]
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---[[
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Return a line-buffered iterator over the output of given command.
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@class function
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@name execi
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@param command String containing the command to execute
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@return Iterator
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]]
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---[[
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Issue an ubus call.
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@class function
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@name ubus
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@param object String containing the ubus object to call
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@param method String containing the ubus method to call
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@param values Table containing the values to pass
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@return Table containin the ubus result
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]]
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---[[
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Convert data structure to JSON
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@class function
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@name serialize_json
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@param data The data to serialize
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@param writer A function to write a chunk of JSON data (optional)
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@return String containing the JSON if called without write callback
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]]
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---[[
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Returns the absolute path to LuCI base directory.
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@class function
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@name libpath
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@return String containing the directory path
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]]
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---[[
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This is a coroutine-safe drop-in replacement for Lua's "xpcall"-function
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@class function
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@name coxpcall
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@param f Lua function to be called protected
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@param err Custom error handler
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@param ... Parameters passed to the function
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@return A boolean whether the function call succeeded and the return
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-- values of either the function or the error handler
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]]
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---[[
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This is a coroutine-safe drop-in replacement for Lua's "pcall"-function
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@class function
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@name copcall
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@param f Lua function to be called protected
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@param ... Parameters passed to the function
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@return A boolean whether the function call succeeded and the returns
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-- values of the function or the error object
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]]
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