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)
IF you gain some knowledge or the information here solved your programming problem. Please consider donating to the less fortunate or some charities that you like. Apart from donation, planting trees, volunteering or reducing your carbon footprint will be great too.
Advertisement
Tutorials
+21k Golang : GORM create record or insert new record into database example
+11.9k Golang : Extract part of string with regular expression
+11.2k SSL : The certificate is not trusted because no issuer chain was provided
+9k Facebook : Getting the friends list with PHP return JSON format
+5.5k Facebook : How to force facebook to scrape latest URL link data?
+13.2k Golang : Convert spaces to tabs and back to spaces example
+7.1k Gogland : Single File versus Go Application Run Configurations
+26.2k Golang : Find files by extension
+6.5k Golang : Normalize email to prevent multiple signups example
+6.4k Golang : Get expvar(export variables) to work with multiplexer
+13.9k Golang : Reset buffer example
+18.4k Golang : How to make function callback or pass value from function as parameter?