backslash used as operator (integer division)

[dequeb]

in BASIC, the backslash character (\) is used for integer division on float numbers. When I try to use it, I get an error. Here is the code:

package "BUG_REPPORT"

Expr
	: number "\\" number;      	    								

And here is the message :

Parse Errors:
Parse Error: SyntaxRule : nt : ∙SyntaxAlternates ;  I[4]=number (36,42) number at line 6 col 7
Expected one of: [empty,nt,string_lit,tokid]

I also tried:

package "BUG_REPPORT"

Expr
	: number intDivOp number;      	    								

intDivOp: '\\';

This gives me the same error as above.

[goccmack]

gogll does not allow escaped chars in string_lit. You can define and use a division token as in the following grammar:

package "test"

div : '\\' ;

int : number {number} ;

Expr : int div int ;

You can test the grammar as follows:

package test

import (
"test/lexer"
"test/parser"
"testing"
)

const input = 12 \ 4

func Test1(t *testing.T) {
l := lexer.New([]rune(input))
_, errs := parser.Parse(l)
if len(errs) > 0 {
t.Fail()
}
}

go test -v
=== RUN Test1
--- PASS: Test1 (0.00s)
PASS
ok test 0.414s

[dequeb]

Thank you for your suggestion.