Golang : Customize scanner.Scanner to treat dash as part of identifier
Putting this down here for my own future reference. Ok, the problem that I'm solving today involved using the text/scanner
package to parse a given input with strings such as beli-belah
, buah-buahan
and jalan-jalan
.
The initial problem is that scanner.Scanner
will break buah-buahan
to buah
and buahan
.
So, how to customize the scanner to treat -
dash as part of the identifier?
Simple, use .IsIdentRune
method to override the default behavior of the scanner
.
For example,
var scn scanner.Scanner
scn.Init(rumiReader)
scn.Whitespace ^= 1<<'\t' | 1<<'\n' | 1<<'\r' | 1<<' ' // don't skip tabs and new lines
// treat leading '-' as part of an identifier ... for word such as buah-buahan, biri-biri
scn.IsIdentRune = func(ch rune, i int) bool {
return ch == '-' && i == 0 || unicode.IsLetter(ch) || unicode.IsDigit(ch) && i > 0 || unicode.IsPunct(ch)
}
If you encounter the same problem as I am, hope this helps!
Reference :
See also : Golang : How to tokenize source code with text/scanner package?
By Adam Ng(黃武俊)
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