ACMEScript - Functions
This section provides an overview of the functions that are available in ACMEScript.
Basic Functions
. (concat)
(. [<symbol>]+)
Concatenate and return the stringified versions of the symbol arguments.
Note
This function will not add spaces between the symbols. One can use the nl and sp functions to add newlines and spaces.
argv
(argv [<n:integer>]*)
Evaluates to the n-th argument of the script. The index starts a 0, where the 0-th argument is the name
of the script. If the argv function is called without an argument or stand-alone then a string including
the name of the function and the arguments is returned.
The number of arguments available is stored in the variable argc.
See also
;; Print the script name
(print "The name of the script is:" (argv 0))
;; Print the first argument
(print "The first argument is:" (argv 1))
;; Print script name and all arguments
(print "All arguments:" argv)
assert
(assert <boolean>)
The assert function terminates the script if its argument evaluates to false.
(assert (== (get-configuration "cse.type")
"IN")) ;; Terminates when the setting is different from "IN"
base64-encode
(base64-encode <string>)
This function encodes a string as base64.
See also
block
(block <name:string> <s-expression>+)
The block function executes a number of expressions in a named context. The first argument is a string that specifies the block's name.
The following arguments are s-expressions that are executed in the block.
The result of the last expression is returned. A block can be exited early with the return-from function.
See also
(block "myBlock" 1 2 3) ;; Returns 3
(block "myBlock" 1 (return-from "myBlock" 2) 3) ;; Returns 2
One can use the block function to implement break and continue functionality in loops:
;; Example for a break block
;; The following example breaks the loop when the value of "i" is 5
(block break
(dotimes (i 10)
((print i)
(if (== i 5)
(return-from break)))))
;; Example for a continue block
;; The following example skips the value of "i" when it is 5
(dotimes (i 10)
(block continue
(if (== i 5)
(return-from continue))
(print i)))
car
(car <list>)
The car function returns the first symbol from a list. It doesn't change the original list.
Note
A list needs to be quoted when used directly.
case
(case <key:string> (<condition> <s-expression>)*)
The case function implements the functionality of a switch...case statement in other programming languages.
The key s-expression is evaluated and its value taken for the following comparisons. After this expression a number of lists may be given.
Each of these list contains two symbols that are handled in order:
- The first symbol evaluates to a value that is compared to the result of the key s-expression.
- If there is a match then the second s-expression is evaluated, and then the comparisons are stopped and the case function returns.
The special symbol otherwise for a condition s-expression always matches and can be used as a default or fallback case .
(case aSymbol
( 1 (print "Result: 1"))
( (+ 1 1) (print "Result: 2"))
(otherwise (print "Result: something else")))
cdr
(cdr <list>)
The cdr function returns a list with all symbols from a list except the first symbol. It doesn't change the original list.
Note
A list needs to be quoted when used directly.
cons
(cons <symbol> <list>)
The cons function adds a new symbol to the front of a list and returns it. It doesn't change the original list.
Note
A list needs to be quoted when used directly.
(cons 1 2) ;; Returns (1 2)
(cons 1 '(2 3)) ;; Returns (1 2 3)
(cons '(1 2) '(3 4)) ;; Returns ((1 2) 3 4)
datetime
(datetime [<format:string>])
The datetime function returns the current date and time. As a default, if not argument is provided, the function returns an ISO8901 timestamp. An optional format string can be provided. With this format string one can define the format for the output based on the format defined by Python's strftime() function.
All timestamps are UTC-based.
(datetime) ;; Returns a timestamp, e.g. 20230302T221625.771604
(datetime "%H:%M") ;; Returns, for example, "22:16"
defun
(defun <function name> <parameter list> <function body>)
The defun function defines a new function.
The first argument to this function is a string and specifies the new function's name. A function definition overrides already user-defined or built-in functions with the same name.
The second argument is a symbol list with argument names for the function. Arguments act as function-local variables that can be used in the function body.
The third argument is an s-expression that is evaluated as the function body.
The result of a function is the result of the expression that is evaluated last in a function evaluation.
(defun greeting (name) ;; define the function
(print "hello" name))
(greeting "Arthur") ;; call the function
;; Fibonacci
(defun fib (n) ;; Define the function
(if (< n 2)
n
(+ (fib (- n 1))
(fib (- n 2)))
))
(fib 10) ;; Returns 55
dec
(dec <variable> [<value:number>])
The dec function decrements a variable. The default for the increment is 1, but can be given as an optional second argument. If this argument is provided then the variable is decremented by this value. The value can be an integer or a float.
The function returns the variable's new value.
See also
(setq a 1) ;; Set variable "a" to 1
(dec a) ;; Decrement variable "a" by 1
(dec a 2.5) ;; Decrement variable "a" by 2.5
dolist
(dolist (<loop variable> <list:list or quoted list> [<result variable>]) (<s-expression>+))
The dolist function loops over a list.
The first arguments is a list that contains a loop variable, a list to iterate over, and an optional
result variable. The second argument is a list that contains one or more s-expressions that are executed in the loop.
If the result variable is specified then the loop returns the value of that variable, otherwise nil.
(dolist (i '(1 2 3 4 5 6 7 8 9 10))
(print i) ;; print 1..10
(setq result 0)
(dolist (i '(1 2 3 4 5 6 7 8 9 10) result)
(setq result (+ result i))) ;; sum 1..10
(print result) ;; 55
dotimes
(dotimes (<loop variable> <count:number> [<result variable>]) (<s-expression>+))
The dotimes function provides a simple numeric loop functionality.
The first arguments is a list that contains a loop variable that starts at 0, the loop count (which must be a non-negative number), and an optional
result variable. The second argument is a list that contains one or more s-expressions that are executed in the loop.
If the result variable is specified then the loop returns the value of that variable, otherwise nil.
(dotimes (i 10)
(print i) ;; print 0..9
(setq result 0)
(dotimes (i 10 result)
(setq result (+ result i))) ;; sum 0..9
(print result) ;; 45
eval
(eval <quoted list>)
The eval function evaluates and executes a quoted list or symbol.
See also
evaluate-inline
(evaluate-inline <boolean>)
With this function one can disable or enable the evaluation of s-expressions in strings.
(evaluate-inline false) ;; Disables inline evaluation
(print "1 + 2 = [(+ 1 2)]") ;; Prints "1 + 2 = [(+ 1 2)]"
get-json-attribute
(get-json-attribute <JSON> <key:string>)
The get-json-attribute function retrieves an attribute from a JSON structure via a key path. This key may be a structured path to access elements deeper down in the JSON structure. There are the following extra elements to access more complex structures:
- It is possible to address a specific element in a list. This is done be specifying the element as
{n}. - If an element is specified as
{}then all elements in that list are returned in a list. - If an element is specified as
{*}and is targeting a dictionary then a single unknown key is skipped in the path. This can be used to skip, for example, unknown first elements in a structure. This is similar but not the same as{0}that works on lists.
(get-json-attribute { "a" : { "b" : "c" }} "a/b" ) ;; Returns "c"
(get-json-attribute { "a" : [ "b", "c" ]} "a/{0}" ) ;; Returns "b"
(get-json-attribute { "a" : [ "b", "c" ]} "a/{}" ) ;; Returns ( "b" "c" )
(get-json-attribute { "a" : [ "b", "c" ]} "{*}/{0}" ) ;; Returns "b"
has-json-attribute
(has-json-attribute <JSON> <key:string>)
The has-json-attribute function determines whether an attribute exists in a JSON structure for a key path.
This key may be a structured path to access elements deeper down in the JSON structure.
See also
get-json-attribute, remove-json-attribute, [set-json-attribute] (#set-json-attribute)
See get-json-attribute for further details on how to access JSON attributes.
(has-json-attribute { "a" : { "b" : "c" }} "a/b" ) ;; Returns true
(has-json-attribute { "a" : { "b" : "c" }} "a/c" ) ;; Returns false
if
(if <boolean expression> <s-expression> [<s-expression>])
The if function works like an “if-then-else” statement in other programing languages.
The first argument is a boolean expression. If it evaluates to true then the second argument is executed.
If it evaluates to false then the third (optional) argument is executed, if present.
The boolean expression can be any s-expression that evaluates to a boolean value or nil, or a list or a string. nil values, empty lists, or zero-length strings evaluate to false, or to true otherwise.
(if (< 1 2) ;; Evaluates to "true"
(print "true") ;; This expression is executed
(print "false")) ;; This expression is not executed
in
(in <symbol or list> <list or string>)
The in function determines whether a symbol or list is contained in a list, or whether a string is contained in another string.
The function returns true if this is the case, or false otherwise.
See also
(in "Hello" "Hello, World") ;; Returns true
(in "Bye" "Hello, World") ;; Returns false
(in 1 '(1 2 3)) ;; Returns true
(in '(1 2) '((1 2) (3 4))) ;; Returns true
inc
(inc <variable symbol> [<value:number>])
The inc function increments a provided variable.
The default for the increment is 1, but can be given as an optional second argument.
If this argument is provided then the variable is incremented by this value. The value can be an integer or a float.
The function returns the variable's new value.
See also
(setq a 1) ;; Set variable "a" to 1
(inc a) ;; Increment variable "a" by 1
(inc a 2.5) ;; Increment variable "a" by 2.5
index-of
(index-of <value> <list or string>)
The index-of function determines the index of a value in a list, or the index of a string in another string.
If the second argument is a string then the first argument must be a string as well. The index is 0-based.
The function returns the index as a number, or nil if the value could not be found.
(index-of 1 '(1 2 3)) ;; Returns 0
(index-of "a" '("b", "c", "d")) ;; Returns nil
(index-of "b" "abc") ;; Returns 1
is-defined
(is-defined <symbol>)
The is-defined function tests whether a symbol (ie. a variable, built-in or defined function) is defined.
(setq a 1) ;; Define variable "a"
(is-defined 'a) ;; Evaluates to "true".
(is-defined 'b) ;; Evaluates to "false"
Note
Most of the time the symbol argument needs to be quoted, otherwise the symbol is evaluated first and the function will not work as expected.
json-to-string
(json-to-string <JSON>)
The json-to-string function returns a JSON structure in a string.
See also
jsonify
(jsonify <string>)
The jsonify function returns a string where characters are escaped that would otherwise break a JSON structure.
See also
lambda
(lambda <parameter list> <function body>)
The lambda function defines a new nameless function.
It is similar to the defun function, with the difference that functions defined as lambda functions cannot be called by name. They need to be used directly, assigned to a variable, or passed, for example, in a function call.
The first argument is a symbol list with argument names for the lambda function. Arguments act as function-local variables that can be used in the function body.
The second argument is an s-expression that is evaluated as the function body.
The result of a lambda function is the result of the expression that is evaluated last in a function evaluation.
((lambda (x) (* x x)) 5) ;; Returns 25
(setq y (lambda (x) (* x x))) ;; Define and assign lambda function
(y) ;; Returns ( ( x ) ( * x x ) )
((y) 5) ;; Returns 25
length
(length <string or list>)
The length function returns the length of a string or the number of elements in a list.
let*
(let* [( <variable> <s-expression> )]+)
The let* function let one assigns values to variables in multiple steps.
Each assignment consists, like the setq function, of an implicit quoted list with a variable symbol and an s-expression, but differently from the setq function, the let* function handles multiple assignments. The assignments are handled sequentially.
Note
The let function (without the star), where assignments are handled in parallel is yet not supported.
See also
(let* (a 1) ;; Assigns 1 to a
(a (+ a 1))) ;; Assigns a + 1 = 2 to a
(let* (b 2) (c 3)) ;; Assigns 2 to b and 3 to c
list
(list <symbol>+)
The list function returns a list that contains all the symbol arguments.
See also
log
(log <s-expression>*)
The log function prints symbols to the logging console with a debug log-level. Usually these symbols are strings or numbers, but representations of other data types are supported as well.
The function always returns nil.
log-error
(log <s-expression>*)
The log-error function prints symbols to the logging console with an warning log-level. Usually these symbols are strings or numbers, but representations of other data types are supported as well.
The function always returns nil.
lower
(lower <string>)
The lower function returns a lower case copy of the input string.
See also
match
(match <string> <regex:string>)
The match function determines whether a string matches a regular expression regex.
Note
The default implementation supports a simplified regex operator set:
?: any single character*: zero or more characters+: one or more characters\: Escape an expression operator
nl
(nl)
The nl function returns a newline character.
nth
(nth <index:number> <list or string>)
The nth function returns the n-th element from a list, or the nth character from a string.
The index is 0-based.
parse-string
(parse-string <string with an <s-expression>)
The parse-string function parses a string that contains an s-expression and returns the result as an executable s-expression for further evaluation, e.g. with the eval function.
(print <s-expression>*)
The print function prints symbols to the console. Usually these symbols are strings or numbers, but representations of other data types are supported as well.
The function always returns nil.
progn
(progn <s-expression>+)
The progn function evaluates all provided symbols or lists, and returns the result of the last evaluation.
All other results are ignored.
This function is implicitly used internally when used to evaluate s-expressions.
See also
quit
(quit [<symbol>])
The quit function ends the execution of the current script without an 0 error code.
If a symbol is provided for the optional argument its value is taken as the result of the script. Otherwise, nil is returned.
See also
quit-with-error
(quit-with-error [<symbol>])
The quit-with-error function ends the execution of the current script with an -1 error code.
If a symbol is provided for the optional argument its value is taken as the result of the script. Otherwise, nil is returned.
See also
quote
(quote <symbol or list>)
The quote function returns a quoted version of the argument. It can be used to get a quoted version of an s-expression or symbol that is the result of another function.
random
(random [<end:number> or <start:number> <end:number>])
The random function generates a random float number in the given range.
The default for the range, when no argument is given, is [0.0, 1.0]. If one number argument is given then this indicates a range of [0.0, \
(random) ;; Returns, for example, 0.748786
(random 10) ;; Returns, for example, 4.976338
(random 10 20) ;; returns, for example, 12.73221
remove-json-attribute
(remove-json-attribute <JSON> <key:string>+)
The remove-json-attribute function removes one or more attributes and their values from a JSON structure via their key paths. This key may be a structured path to access elements deeper down in the JSON structure. See get-json-attribute for further details on how to access JSON attributes.
The function doesn't change the original JSON structure, but returns an updated structure.
return
(return [<s-expression>])
The return function stops the evaluation of a function or while loop and returns the evaluation to the caller. The function may return a symbol, or nil.
return-from
(return-from <block name:string> [<s-expression>])
The return-from function stops the evaluation of a block with the given name and returns the evaluation to the caller.
The function may return a symbol, or nil.
See also
round
(round <value:number> [<precission:number>])
The round function rounds a number to precision digits after the decimal point. The default is 0, meaning to round to nearest integer.
set-json-attribute
(set-json-attribute <JSON> <key:string> <value>)
(set-json-attribute <JSON> '( '(<key:string> <value>)* )
The set-json-attribute function adds or updates an attribute in a JSON structure via a key path to the new value. This key may be a structured path to access elements deeper down in the JSON structure. See get-json-attribute for further details on how to access JSON attributes.
There are two forms to use this function:
- The first form takes a JSON structure, a key path, and a value as arguments. The function sets the attribute in the JSON structure and returns the updated structure.
-
The second form takes a JSON structure and a list of list of key-value pairs as arguments. The function sets the attributes in the JSON structure and returns the updated structure. This form is useful when multiple attributes need to be set in one call.
Note
The list as well as each list of key-value pairs need to be quoted if provided directly.
The function doesn't change the original JSON structure, but returns an updated structure.
(set-json-attribute { "a" : { "b" : "c" }} "a/b" "e") ;; Returns {"a": {"b": "e"}}
(set-json-attribute { "a" : { "b" : "c" }} '('("a/b" "d") '("a/c" "e"))) ;; Returns { "a" : { "b" : "d", "c" : "e"}
setq
(setq <variable> <s-expression)
The setq function assigns a value to a variable.
See also
sleep
(sleep <number>)
The sleep function adds a delay to the script execution. The evaluation stops for a number of seconds. The delay could be provided as an integer or float number.
If the script execution timeouts during a sleep, the function is interrupted and all subsequent s-expressions are not evaluated.
The function returns the delay.
slice
(slice <start:number> <end:number> <list or string>)
The slice function returns the slice of a list or a string.
The behavior is the same as slicing in Python, except that both start and end must be provided. The first argument is the start (including) of the slice, the second is the end (excluding) of the slice. The fourth argument is the list or string to slice.
(slice 1 2 '(1 2 3)) ;; Returns (2)
(slice 0 -1 "abcde") ;; Returns "abcd"
(slice -1 99 "abcde") ;; Returns "e"
(slice 99 100 '(1 2 3)) ;; Returns ()
sp
(sp)
The sp function returns a space character.
string-to-json
(string-to-json <string>)
The string-to-json function converts a string to a JSON structure and returns it. The string must contain a valid parseable JSON structure.
See also
to-number
(to-number <symbol>)
The to-number function converts a string that contains a number to a number symbol and returns it.
See also
to-string
(to-string <symbol>)
The to-string function converts a symbol of any of the built-in types to a string representation and returns it.
See also
to-symbol
(to-symbol <string>)
The to-symbol function converts a string to a symbol and returns it. The resulting symbol has the name and value of the input string, but is itself not a string.
See also
unwind-protect
(unwind-protect <s-expression> <cleanup s-expression>)
The unwind-protect function evaluates the first s-expression and then the second s-expression.
The second s-expression is always evaluated, even if the first s-expression throws an error or returns early.
This is effectively a try/finally block (without a catch)
Currently only programmatic flow interrupts are supported to trigger the cleanup form: assert, quit, quit-with-error, return, return-from.
The function always returns the result of the cleanup s-expression.
;; Prints "main form" and "cleanup form" and returns 2
(unwind-protect
((print "main form") 1)
((print "cleanup form") 2))
upper
(upper <string>)
The upper function returns an upper case copy of the input string.
See also
url-encode
(url-encode <string>)
The url-encode function encodes a string so that may be safely used as part of a URL.
See also
while
(while <boolean guard> <body s-expression>)
The while function implements a loop functionality.
A while loop continues to run when the first guard s-expression evaluates to true. Then the body s-expression is evaluated. After this the guard is evaluated again and the the loops continues or the while function returns.
The boolean guard can be any s-expression that evaluates to a boolean value or nil, or a list or a string. nil values, empty lists, or zero-length strings evaluate to false, or to true otherwise.
The while function returns the result of the last evaluated s-expression in the body.
(setq i 0) ;; Set loop variable
(while (< i 10) ;; Loop 10 times
((print i) ;; Print to the console
(inc i))) ;; Increment loop variable
CSE-Specific Functions
The following functions provide support to access certain CSE functionalities, configurations, and other runtime aspects.
clear-console
(clear-console)
The clear-console function clears the console screen.
cse-attribute-info
(cse-attribute-info <name:str>)
Return a list of CSE attribute infos for the attribute `name``. The search is done over the short and long names of the attributes applying a fuzzy search when searching the long names.
The function returns a quoted list where each entry is another quoted list with the following symbols:
- attribute short name
- attribute long name
- attribute type
(cse-attribute-info "acop") ;; Returns ( ( "acop" "accessControlOperations" "nonNegInteger" ) )
cse-status
(cse-status)
The cse-status function returns the CSE's current running status as an upper-case string.
The return value is one of the following strings:
- STARTING
- RUNNING
- STOPPING
- STOPPED
- RESETTING
get-config
(get-config <key:string>)
The get-config function retrieves a setting from the CSE's internal configuration. The key is a configuration name as defined in the configuration documentation.
See also
(get-config "cse.type") ;; Returns, for example, 1
(get-config "cse.cseID") ;; Returns, for example, "/id-in"
get-loglevel
(get-loglevel)
The get-loglevel function retrieves a the CSE's current log level setting. The return value is one of the following strings:
- DEBUG
- INFO
- WARNING
- ERROR
- OFF
get-storage
(get-storage <key:string>)
The get-storage function retrieves a value from the CSE's internal script-data storage. The key is a unique name of the value.
See also
has-config
(has-config <key:string>)
The has-config function determines whether a setting from the CSE's internal configuration exists. The key is a configuration name as defined in the configuration documentation.
See also
has-storage
(has-storage <key:string>)
The has-storage function determines whether a value has been stored under the given key in the CSE's internal script-data storage.
See also
include-script
(include-script <script name:string> [<argument:any>]*)
The include-script function runs another ACMEScript script by its script name in its own context. Differently to the run-script function variables, function definitions etc from the script execution are available in the calling script after the script finished.
The function returns the result of the finished script.
See also
log-divider
(log-divider [<message:string>])
The log-divider function inserts a divider line in the CSE's DEBUG log. It can help to easily identify the different sections when working with many requests. An optional (short) message can be provided in the argument.
(log-divider) ;; Add a divider
(log-divider "Hello, World") ;; Add a divider with a centered message
print-json
(print-json <JSON>)
The print-json function prints a JSON structure with syntax highlighting to the console.
put-storage
(put-storage <storageID:string> <key:string> <value:symbol>)
The put-storage function inserts or updates a value in the CSE's internal script-data storage with the storage ID storageID. The key is a unique name of the value.
See also
(put-storage "aStorageID" "aKey" "Hello, World") ;; Inserts or updates the key "aKey" in "aStorageID"
remove-storage
(remove-storage <key:string>)
(remove-storage <storageID:string> <key:string>)
There are two forms of the remove-storage function.
With only one parameter the remove-storage function removes all key/value pairs from the CSE's internal script-data storage with the storage ID storageID.
With two parameters the remove-storage function removes a key/value pair from the CSE's internal script-data storage with the storage ID storageID. The key is a unique name of the value.
See also
(remove-storage "aStorageID" "aKey") ;; Removes the key and value from storageID
(remove-storage "aStorageID") ;; Removes all keys and value from storageID
reset-cse
(reset-cse)
The reset-cse function initiates a CSE reset.
The script execution does continue after the CSE finished the reset.
run-script
(run-script <script name:string> [<argument:any>]*)
The run-script function runs another ACMEScript script by its script name in its own scope. Variables, function definitions etc from the script execution are not available in the calling script.
The function returns the result of the finished script.
See also
(setq result (run-script "aScript" "an argument")) ;; Run the script "aScript" and assign the result
runs-in-ipython
(runs-in-ipython)
The runs-in-ipython function determines whether the CSE currently runs in an IPython environment, such as Jupyter Notebooks.
schedule-next-script
(schedule-next-script <scriptName:string> <argument:any>*)
The schedule-next-script function schedules the next script that is run after the current script finished.
This is different from include-script and run-script in so far that the context of the current running script is finished and may be called again. This means that a script can schedule itself, which would not be possible otherwise because scripts can only be run one at a time.
See also
set-config
(set-config <key:string> <value:any>)
The set-config function updates a setting from the CSE's internal configuration. The key is a configuration name as defined in the configuration documentation.
It is only possible to update an existing setting, but not to create a new one. The value type must be equivalent to the setting's type.
See also
set-console-logging
(set-console-logging <boolean>)
The set-console-logging function enables or disables console logging. It does not turn on or off logging in general. Printing to the console is not affected.
oneM2M-Specific Functions
The following functions provide support for the oneM2M request operations.
create-resource
(create-resource <originator:string> <resource-id:string> <resource:JSON> [request arguments:JSON])
The create-resource function sends a oneM2M CREATE request to a target resource.
The function has the following arguments:
- originator of the request
- The target resource-id
- The resource JSON structure
- Optional: A JSON structure with additional request arguments
The function will provide defaults for the required request arguments (e.g. rvi, rid). These can be overwritten if necessary by setting them in the request arguments argument.
The function returns a list:
(<response status:number> <resource:JSON>)
- response status is the oneM2M Response Status Code (RSC) for the request
- resource is the response content
(create-resource "CAdmin" "cse-in" { "m2m:cnt" : { "rn": "myCnt" }}) ;; Returns ( 2001 { "m2m:cnt" ... } )
;; Provide extra requestVersionIndicator
(create-resource "CAdmin" "cse-in" { "m2m:cnt" : { }} { "rvi": "3"}) ;; Returns ( 2001 { "m2m:cnt" ... } )
delete-resource
(delete-resource <originator:string> <resource-id:string> [request arguments:JSON])
The delete-resource function sends a oneM2M DELETE request to a target resource.
The function has the following arguments:
- originator of the request
- The target resource-id
- Optional: A JSON structure with additional request arguments
The function will provide defaults for the required request arguments (e.g. rvi, rid). These can be overwritten if necessary by setting them in the request arguments argument.
The function returns a list:
(<response status:number> <resource:JSON>)
- response status is the oneM2M Response Status Code (RSC) for the request
- resource is the response content (usually nil if successful)
(delete-resource "CAdmin" "cse-in/myCnt") ;; Returns ( 2002 { "m2m:cnt" ... } )
;; Provide extra requestVersionIndicator
(delete-resource "CAdmin" "cse-in/myCnt" { "rvi": "3"}) ;; Returns ( 2002 { "m2m:cnt" ... } )
import-raw
(import-raw <originator:string> <resource:JSON>)
The import-raw function creates a resource in the CSE without using the normal procedures when handling a CREATE request. The resource is added to the resource tree without much validation.
This function is primarily used when importing initial resources, and when restoring resources during the startup of the CSE.
resource is a valid oneM2M resource. All necessary attributes must be present in that resource, including the parentID ( pi ) attribute that determines the location in the resource tree.
The function returns a list:
(<response status:number> <resource:JSON>)
- response status is the oneM2M Response Status Code (RSC) for the request
- resource is the response content (usually nil if successful)
;; Add an AE resource under the CSEBase
(import-raw
"CmyAE" ;; Originator
{ "m2m:ae": {
"ri": "CmyAE",
"rn": "CmyAE",
"pi": "${ (get-config \"cse.ri\") }", ;; Get the CSE's resource ID from the configuration
"rr": true,
"api": "NmyAppId",
"aei": "CmyAE",
"csz": [ "application/json", "application/cbor" ]
}})
query-resource
(query-resource <query:quoted s-expression> <resource:JSON>)
The query-resource function evaluates a query for the attributes in the resource structure.
The function has the following arguments:
- query to evaluate. This query must be quoted and follows oneM2M's advanced query specification. the unknown symbols in the query are replaced by the resource's attribute values during the evaluation. Only a limited set boolean and comparison operators are allowed in the query.
- A oneM2M resource as a JSON structure.
The function returns a boolean indicating the query result.
See also
;; Returns true
(query-resource
'(& (> x 100) (== rn "cnt1234"))
{ "m2m:cnt": {
"rn": "cnt1234",
"x": 123
}})
retrieve-resource
(retrieve-resource <originator:string> <resource-id:string> [request arguments:JSON])
The retrieve-resource function sends a oneM2M RETRIEVE request to a target resource.
The function has the following arguments:
- originator of the request
- The target resource-id
- Optional: A JSON structure with additional request arguments
The function will provide defaults for the required request arguments (e.g. rvi, rid). These can be overwritten if necessary by setting them in the request arguments argument.
The function returns a list:
(<response status:number> <resource:JSON>)
- response status is the oneM2M Response Status Code (RSC) for the request
- resource is the response content (usually the target resource if successful)
(retrieve-resource "CAdmin" "cse-in/myCnt") ;; Returns ( 2000 { "m2m:cnt" ... } )
;; Provide extra requestVersionIndicator
(retrieve-resource "CAdmin" "cse-in/myCnt" { "rvi": "3"}) ;; Returns ( 2000 { "m2m:cnt" ... } )
send-notification
(send-notification <originator:string> <resource-id:string> <notification:JSON> [request arguments:JSON])
The send-notification function sends a oneM2M NOTIFY request to a target resource.
The function has the following arguments:
- originator of the request
- The target resource-id
- The notification JSON structure
- Optional: A JSON structure with additional request arguments
The function will provide defaults for the required request arguments (e.g. rvi, rid). These can be overwritten if necessary by setting them in the request arguments argument.
The function returns a list:
(<response status:number> <resource:JSON>)
- response status is the oneM2M Response Status Code (RSC) for the request
- resource is the response content
(send-notification "CAdmin" "cse-in/myAE" { "m2m:sgn" : { ... }}) ;; Returns notification result
update-resource
(update-resource <originator:string> <resource-id:string> <resource:JSON> [request arguments:JSON])
The update-resource function sends a oneM2M UPDATE request to a target resource.
The function has the following arguments:
- originator of the request
- The target resource-id
- The resource JSON structure
- Optional: A JSON structure with additional request arguments
The function will provide defaults for the required request arguments (e.g. rvi, rid). These can be overwritten if necessary by setting them in the request arguments argument.
The function returns a list:
(<response status:number> <resource:JSON>)
- response status is the oneM2M Response Status Code (RSC) for the request
- resource is the response content
(update-resource "CAdmin" "cse-in" { "m2m:cnt" : { "mni": 10 }}) ;; Returns ( 2004 { "m2m:cnt" ... } )
;; Provide extra requestVersionIndicator
(update-resource "CAdmin" "cse-in" { "m2m:cnt" : { "mni": 10 }} { "rvi": "3"}) ;; Returns ( 2004 { "m2m:cnt" ... } )
Text UI
open-web-browser
(open-web-browser <url:string>)
The open-web-browser function opens a web browser with the given URL.
(open-web-browser "https://www.onem2m.org") ;; Opens the web browser with the URL "https://www.onem2m.org"
set-category-description
(set-category-description <category:string> <description:string>)
The set-category-description function sets the description for a whole category in the CSE's Text UI.
The description may contain Markdown formatting.
(set-category-description "myCategory" "My category description") ;; Sets the description for the category "myCategory"
runs-in-tui
(runs-in-tui)
The runs-in-tui function determines whether the CSE currently runs in Text UI mode.
tui-notify
(tui-notify <message:str> [<title:str>] [<severity>:str>] [<timeout:float>])
Show a desktop-like notification in the TUI.
This function is only available in TUI mode. It has the following arguments:
- message: The message to show.
- title: (Optional) The title of the notification.
- severity: (Optional) The severity of the notification. This can be one of the following values:
- information (the default)
- warning
- error
- timeout: (Optional) The timeout in seconds after which the notification will disappear again. If not specified, the notification will disappear after 3 seconds.
If one of the optional arguments needs to be left out, a nil symbol must be used instead. The function returns NIL.
(tui-notify "a message") ;; Displays "a message" in an information notification for 3 seconds
(tui-notify "a message" "a title") ;; Displays "a message" with title "a title in an information notification for 3 seconds
(tui-notify "a message") ;; Displays "a message" in an information notification for 3 seconds
(tui-notify "a message" nil "warning") ;; Displays "a message" in a warning notification, no title
(tui-notify "a message" nil nil 10) ;; Displays "a message" in an information notification, no title, for 3 seconds
tui-refresh-resources
(tui-refresh-resources)
The tui-refresh-resources function refreshes the resources in the CSE's Text UI.
tui-visual-bell
(tui-visual-bell)
The tui-visual-bell function shortly flashes the script's entry in the scripts' list/tree.
Network
http
(http <operation:quoted symbol> <url:string> [<headers:JSON or nil>] [<body:string or JSON>])
The http function sends an http request to an http server.
The function has the following arguments:
- operation of the request. This is one of the following supported quoted symbols: get, post, put, delete, patch
- The target server's url. This is a string with a valid URL.
- Optional: A JSON structure of header fields. Each header field is a JSON attribute with the name of the header field and its value. If the optional body argument is present then this argument must be present as well, ie. with at least an empty JSON structure or the nil symbol.
- Optional: The http request's body, which could be a string or a JSON structure.
The function returns a list:
(<http status:number> <response body:JSON> <response headers:list of header fields)
- http status is the htttp status code for the request
- response body is the response content
- response headers is a list of header fields. The format of these header fields is the same as in the request above.
;; Retrieve a web page
(http 'get "https://www.onem2m.org")
;; Send a oneM2M CREATE request manually
(http 'post "http://localhost:8080/cse-in" ;; Operation and URL
{ "X-M2M-RI":"1234", ;; Header fields
"X-M2M-RVI": "4",
"X-M2M-Origin": "CAdmin",
"Content-type": "application/json;ty=3" }
{ "m2m:cnt": { ;; Body
"rn": "myCnt"
...
}})
ping-tcp-service
(ping-tcp-server <hostname:string> <port:number> [<timeout:number>])
The ping-tcp-servicefunction tests the availability and reachability of a TCP-based network service.
It has the following arguments:
- The hostname of the target service. This can be a hostname or an IP address.
- The port of the target service. This is a number.
- Optional: The request timeout in seconds. The default is 5 seconds.
The function returns a boolean value.
(ping-tcp-service "localhost" 8080) ;; Returns true if the service is reachable
(ping-tcp-service "localhost" 8080 2) ;; Returns true if the service is reachable. Timeout after 2 seconds.
Provided Functions
In addition to the functions defined in this documentation, more functions are provided in the file ASFunctions.as.
These functions can be included and made available in own scripts with the include-script function:
cadr
(cadr <list>)
The cadr function returns the second element of a list.
See also
caddr
(caddr <list>)
The caddr function returns the third element of a list.
See also
set-and-store-config-value
(set-and-store-config-value <key:string> <value:any>)
The set-and-store-config-value function stores the current value of a configuration setting and then updates the setting with a new value.
The function has the following arguments:
- The key of the configuration setting
- The value to set
The function returns the previous value of the configuration setting.
See also
(set-and-store-config-value "cse.checkExpirationsInterval" 10) ;; Returns the previous value of the configuration setting
restore-config-value
(restore-config-value <key:string>)
The restore-config-value function restores a configuration setting to its previous value.
The function has the following arguments:
- The key of the configuration setting
See also
get-response-status
(get-response-status <response:list>)
The get-response-status function returns the response status of a oneM2M request.
The function has the following arguments:
- The response list
The function returns the response status.
See also
(get-response-status (retrieve-resource "CAdmin" "cse-in/myCnt")) ;; Returns the response status
get-response-resource
(get-response-resource <response:list>)
The get-response-resource function returns the response resource of a oneM2M request.
The function has the following arguments:
- The response list
The function returns the response resource.
See also
(get-response-resource (retrieve-resource "CAdmin" "cse-in/myCnt")) ;; Returns the response resource
eval-if-resource-exists
(eval-if-resource-exists <originator:string> <id:string> <cmd:s-expression> <else-cmd:s-expression>)
The eval-if-resource-exists function evaluates a command if a resource exists and can be retrieved. Otherwise, it evaluates an alternative command.
If found, the resource is stored in the "_resource" variable that can be used in the "cmd" command.
The function has the following arguments:
- The originator of the request
- The id of the resource
- The cmd to evaluate if the resource exists
- The else-cmd to evaluate if the resource does not exist
The function returns the result of the evaluated command.