Golang : Simple word wrap or line breaking example
Problem:
You have a long text string and you want to wrap the text according to a given number of words per line so that the output will fit nicely to display on terminal or web page. Or you want to split a long text string into multiple lines after a given length(number of words). How to do that?
Solution:
This is a simple and primitive line breaking/word wrap solution that should work for most cases.
- convert the string into slice
- push out the words into a line according to the given limit/length and append each line with
\r\n
,
Here you go!
package main
import (
"fmt"
"strings"
)
// Wraps text at the specified number of columns
func word_wrap(s string, limit int) string {
if strings.TrimSpace(s) == "" {
return s
}
// convert string to slice
strSlice := strings.Fields(s)
var result string = ""
for len(strSlice) >= 1 {
// convert slice/array back to string
// but insert \r\n at specified limit
result = result + strings.Join(strSlice[:limit], " ") + "\r\n"
// discard the elements that were copied over to result
strSlice = strSlice[limit:]
// change the limit
// to cater for the last few words in
//
if len(strSlice) < limit {
limit = len(strSlice)
}
}
return result
}
func main() {
str := "Here is a nice text string consisting of eleven words."
fmt.Printf("Original : [%v] \n", str)
// limit to 3 words
fmt.Println(word_wrap(str, 3))
strWithDoubleSpaces := "This code example will attempt to word warp this text string - 'Here is a nice text string consisting of eleven words.'"
fmt.Printf("Original : [%v] \n", strWithDoubleSpaces)
// limit to 7 words
fmt.Println(word_wrap(strWithDoubleSpaces, 7))
unicodeStrWithDoubleSpaces := "Here is a nice text string consisting of eleven words and some unicode characters such as 世界你好."
fmt.Printf("Original : [%v] \n", unicodeStrWithDoubleSpaces)
// limit to 5 words
fmt.Println(word_wrap(unicodeStrWithDoubleSpaces, 5))
longTextStr := "KUALA LUMPUR: The FBM KLCI and key Asian markets were in the red at the midday on Monday but off the day’s worst on some buying support at lower levels while China’s markets and the yuan managed to find a steadier footing. At 12.30pm, the KLCI was down 9.43 point or 0.58% to 1,619.12 with 24 out of the 30 stocks in the red. Turnover was 1.32 billion shares valued at RM855.53mil. However, the broader market was much weaker with decliners beating advancers more than eight to one with 819 losers to 105 gainers while 203 counters were unchanged. China stocks opened sharply lower on Monday but managed to erase much of the losses by midday, with real estate shares reversing initial declines on data showing continuous recovery in the property sector, Reuters report. Hong Kong shares dropped, with investors' risk appetites soured by resumed declines in oil prices as well as Friday's tumbles for equities prices in US and European markets. US light crude oil fell 23 cents to US$29.19 and Brent lost 27 cents to US$28.67. Petronas Gas was the top loser, down 38 sen to RM21.08 and erased 1.25 points from the KLCI, Petronas Dagangan fell 18 sen to RM23.72 but Petronas Chemicals rose three sen to RM7.03. SapuraKencana shed two sen to RM1.66. Refiners Shell and Petron Malaysia were among the top losers, Shell was down 29 sen to RM5.23 and Petron lost 26 sen to RM6.17.Crude palm oil for third-month delivery rose RM26 to RM2,490. Genting Plantations added 14 sen to RM10.36 while PPB Group rose six sen to RM15.78. IOI Corp was flat at RM4.32, KL Kepong fell 18 sen to RM22.68 and Sime Darby three sen to RM7.09. "
fmt.Printf("Original : [%v] \n", longTextStr)
fmt.Println("--------------------------------")
// limit to 11 words per line
fmt.Println(word_wrap(longTextStr, 11))
}
Output:
Original : [Here is a nice text string consisting of eleven words.]
Here is a
nice text string
consisting of eleven
words.
Original : [This code example will attempt to word warp this text string - 'Here is a nice text string consisting of eleven words.']
This code example will attempt to word
warp this text string - 'Here is
a nice text string consisting of eleven
words.'
Original : [Here is a nice text string consisting of eleven words and some unicode characters such as 世界你好.]
Here is a nice text
string consisting of eleven words
and some unicode characters such
as 世界你好.
Original : [KUALA LUMPUR: The FBM KLCI and key Asian markets were in the red at the midday on Monday but off the day’s worst on some buying support at lower levels while China’s markets and the yuan managed to find a steadier footing. At 12.30pm, the KLCI was down 9.43 point or 0.58% to 1,619.12 with 24 out of the 30 stocks in the red. Turnover was 1.32 billion shares valued at RM855.53mil. However, the broader market was much weaker with decliners beating advancers more than eight to one with 819 losers to 105 gainers while 203 counters were unchanged. China stocks opened sharply lower on Monday but managed to erase much of the losses by midday, with real estate shares reversing initial declines on data showing continuous recovery in the property sector, Reuters report. Hong Kong shares dropped, with investors' risk appetites soured by resumed declines in oil prices as well as Friday's tumbles for equities prices in US and European markets. US light crude oil fell 23 cents to US$29.19 and Brent lost 27 cents to US$28.67. Petronas Gas was the top loser, down 38 sen to RM21.08 and erased 1.25 points from the KLCI, Petronas Dagangan fell 18 sen to RM23.72 but Petronas Chemicals rose three sen to RM7.03. SapuraKencana shed two sen to RM1.66. Refiners Shell and Petron Malaysia were among the top losers, Shell was down 29 sen to RM5.23 and Petron lost 26 sen to RM6.17.Crude palm oil for third-month delivery rose RM26 to RM2,490. Genting Plantations added 14 sen to RM10.36 while PPB Group rose six sen to RM15.78. IOI Corp was flat at RM4.32, KL Kepong fell 18 sen to RM22.68 and Sime Darby three sen to RM7.09. ]
KUALA LUMPUR: The FBM KLCI and key Asian markets were in
the red at the midday on Monday but off the day’s
worst on some buying support at lower levels while China’s markets
and the yuan managed to find a steadier footing. At 12.30pm,
the KLCI was down 9.43 point or 0.58% to 1,619.12 with
24 out of the 30 stocks in the red. Turnover was
1.32 billion shares valued at RM855.53mil. However, the broader market was
much weaker with decliners beating advancers more than eight to one
with 819 losers to 105 gainers while 203 counters were unchanged.
China stocks opened sharply lower on Monday but managed to erase
much of the losses by midday, with real estate shares reversing
initial declines on data showing continuous recovery in the property sector,
Reuters report. Hong Kong shares dropped, with investors' risk appetites soured
by resumed declines in oil prices as well as Friday's tumbles
for equities prices in US and European markets. US light crude
oil fell 23 cents to US$29.19 and Brent lost 27 cents
to US$28.67. Petronas Gas was the top loser, down 38 sen
to RM21.08 and erased 1.25 points from the KLCI, Petronas Dagangan
fell 18 sen to RM23.72 but Petronas Chemicals rose three sen
to RM7.03. SapuraKencana shed two sen to RM1.66. Refiners Shell and
Petron Malaysia were among the top losers, Shell was down 29
sen to RM5.23 and Petron lost 26 sen to RM6.17.Crude palm
oil for third-month delivery rose RM26 to RM2,490. Genting Plantations added
14 sen to RM10.36 while PPB Group rose six sen to
RM15.78. IOI Corp was flat at RM4.32, KL Kepong fell 18
sen to RM22.68 and Sime Darby three sen to RM7.09.
See also : Golang : Word limiter example
By Adam Ng
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