keyword | R Documentation |
Recognises a given character sequence.
keyword(word, action = function(s) list(type="keyword",value=s), error = function(p) list(type="keyword",pos =p))
word |
Symbol to be recognised. |
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 |
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") ( keyword("world")(stream) )[c("status","node")] # ok stream <- streamParserFromString("world") ( keyword("world")(stream) )[c("status","node")]
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