Unexpected int at end of statement - go

Question

I'm struggling a bit with this piece of Go code. I have been searching all over the place, but can't understand what is wrong about it.
Error message is: syntax error: unexpected int at end of statement
for that line near the bottom: func (TOHLCV TOHLCVs) Len() int {
I also have this error message for the second to the last line of code:
syntax error: non-declaration statement outside function body
In case the 2 errors are related
package main
import (
"fmt"
"time"
"strconv"
//from https://github.com/pplcc/plotext/
"log"
"os"
"github.com/360EntSecGroup-Skylar/excelize"
"github.com/pplcc/plotext/custplotter"
"gonum.org/v1/plot"
"github.com/pplcc/plotext"
"gonum.org/v1/plot/vg/vgimg"
"gonum.org/v1/plot/vg/draw"
)
// Len implements the Len method of the TOHLCVer interface.
func (TOHLCV TOHLCVs) Len() int {
return len(TOHLCV)
func main() {
//read excel file******************************************
xlsx, err := excelize.OpenFile("/media/Snaps/test snaps.xlsm")
if err != nil {
fmt.Println(err)
return
}
//read all rows into df
df := xlsx.GetRows("ticker_2")
type TOHLCVer interface {
// Len returns the number of time, open, high, low, close, volume tuples.
Len() int
// TOHLCV returns an time, open, high, low, close, volume tuple.
TOHLCV(int) (float64, float64, float64, float64, float64, float64)
}
type TOHLCVs []struct{ T, O, H, L, C, V float64 }
// Len implements the Len method of the TOHLCVer interface.
func (TOHLCV TOHLCVs) Len() int {
return len(TOHLCV)
}
df3 := make(TOHLCVs, 60) // create slice for 60 rows
idx := 0
this code is adapted from:
https://github.com/pplcc/plotext/blob/master/custplotter/tohlcv.go

Answer 1

Function declarations need to be moved out of other functions, Like this:
package main
import (
"fmt"
"github.com/360EntSecGroup-Skylar/excelize"
)
type TOHLCVer interface {
// Len returns the number of time, open, high, low, close, volume tuples.
Len() int
// TOHLCV returns an time, open, high, low, close, volume tuple.
TOHLCV(int) (float64, float64, float64, float64, float64, float64)
}
type TOHLCVs []struct{ T, O, H, L, C, V float64 }
// Len implements the Len method of the TOHLCVer interface.
func (TOHLCV TOHLCVs) Len() int {
return len(TOHLCV)
}
func main() {
//read excel file******************************************
xlsx, err := excelize.OpenFile("/media/Snaps/test snaps.xlsm")
if err != nil {
fmt.Println(err)
return
}
//read all rows into df
df := xlsx.GetRows("ticker_2")
df3 := make(TOHLCVs, 60) // create slice for 60 rows
idx := 0
}
Type declarations can be inside of a function. But, in this case, it makes more sense for them to be outside. There are some situations where it's helpful to declare a function inside another function:
Passing a function as an argument: https://play.golang.org/p/4NgeUvsexto
Assigning an anonymous function to a variable: https://play.golang.org/p/r1DF9_iP0-k
(I'm not sure about the exact logic you're looking for - the above code doesn't do anything yet. I'll also caution against creating an interface unless you needed it.)

Answer 2

So based on answer of #Tyler Bui-Palsulich and #aec my code now looks like below, and no more error messages :-), thanks all !
package main
import (
"fmt"
"time"
"strconv"
//from https://github.com/pplcc/plotext/
"log"
"os"
"github.com/360EntSecGroup-Skylar/excelize"
"github.com/pplcc/plotext/custplotter"
//"github.com/pplcc/plotext/examples"
"gonum.org/v1/plot"
"github.com/pplcc/plotext"
"gonum.org/v1/plot/vg/vgimg"
"gonum.org/v1/plot/vg/draw"
)
// Len implements the Len method of the TOHLCVer interface.
//func (TOHLCV TOHLCVs) Len() int {
// return len(TOHLCV)
//}
type TOHLCVer interface {
// Len returns the number of time, open, high, low, close, volume tuples.
Len() int
// TOHLCV returns an time, open, high, low, close, volume tuple.
TOHLCV(int) (float64, float64, float64, float64, float64, float64)
}
type TOHLCVs []struct{ T, O, H, L, C, V float64 }
// Len implements the Len method of the TOHLCVer interface.
func (TOHLCV TOHLCVs) Len() int {
return len(TOHLCV)
}
// TOHLCV implements the TOHLCV method of the TOHLCVer interface.
func (TOHLCV TOHLCVs) TOHLCV(i int) (float64, float64, float64, float64, float64, float64) {
return TOHLCV[i].T, TOHLCV[i].O, TOHLCV[i].H, TOHLCV[i].L, TOHLCV[i].C, TOHLCV[i].V
}
func main() {
start := time.Now()
//create data for each chart****************************************************
//******************************************************************************
//read excel file******************************************
xlsx, err := excelize.OpenFile("/media/hugues/M.2 windows/Hugues/Snaps/test snaps.xlsm")
if err != nil {
fmt.Println(err)
return
}
//read all rows into df
df := xlsx.GetRows("ticker_2")
df3 := make(TOHLCVs, 60) // create slice for 60 rows
idx := 0
for _, row := range df[1:61] { // read 60 rows
df3[idx].T, err = strconv.ParseFloat(row[28], 64)
df3[idx].O, err = strconv.ParseFloat(row[29], 64)
df3[idx].H, err = strconv.ParseFloat(row[30], 64)
df3[idx].L, err = strconv.ParseFloat(row[31], 64)
df3[idx].C, err = strconv.ParseFloat(row[32], 64)
df3[idx].V, err = strconv.ParseFloat(row[33], 64)
idx++
}