eofMark | R Documentation |
Recognises the end of input flux as a token.
When applied, it does not make use of character and, therefore, end of input can be recognised several times.
eofMark(action = function(s) list(type="eofMark",value=s), error = function(p) list(type="eofMark",pos =p ) )
action |
Function to be executed if recognition succeeds. Character stream making up the token is passed as parameter to this function |
error |
Function to be executed if recognition does not succeed. Position of |
When succeeds, parameter s
takes the value "".
Anonymous function, returning a list.
function(stream)
–> list(status,node,stream)
From input parameters, an anonymous function is defined. This function admits just one parameter, stream, with type streamParser
, and returns a three-field list:
status
"ok" or "fail"
node
With action
or error
function output, depending on the case
stream
With information about the input, after success or failure in recognition
# fail stream <- streamParserFromString("Hello world") ( eofMark()(stream) )[c("status","node")] # ok stream <- streamParserFromString("") ( eofMark()(stream) )[c("status","node")]
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