|Handling semantic whitespace: forcefully avoiding it [message #1768792]
||Mon, 24 July 2017 00:12
Registered: June 2017
I'm trying to apply what I've read in the official docs and on this forum to handle semantic whitespace, but I'm not able to make it work.
My case is simple: accepting strings like "variable_name$" and rejecting strings like "variable_name $". That is: there cannot be any blank between a variable's name and the "$" postfix operator.
(In reality, "variable_name" is a complex datatype rule, not a terminal, in my real language. I'm assuming it's a terminal here just for demo purposes.)
My demo-purposes grammar looks like this:
import "http://www.eclipse.org/emf/2002/Ecore" as ecore
generate myDsl "http://www.xtext.org/example/mydsl/MyDsl"
terminal ID : '^'?('a'..'z'|'A'..'Z'|'_') ('a'..'z'|'A'..'Z'|'_'|'0'..'9')*;
terminal WS : (' '|'\t'|'\r'|'\n')+;
But that grammar accepts e.g. both "variable1$" and "variable2 $", what is not what I want (accepting 'variable1$' is OK, but 'variable2 $' is illegal because it contains blanks between the identifier and the operator). And I don't know why.
Can anyone point out what I'm doing wrong?
Thanks in advance.
[Updated on: Mon, 24 July 2017 00:13]
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