1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
|
package xio
import (
"bufio"
"fmt"
"io"
"os"
"strings"
)
// OpenTwo opens two files. The caller needs to check for a single error only.
func OpenTwo(f1, f2 string) (g1, g2 *os.File, err error) {
if g1, err = os.Open(f1); err != nil {
return nil, nil, err
}
if g2, err = os.Open(f2); err != nil {
return nil, nil, err
}
return g1, g2, nil
}
// TabsToMapFile turns columns from a file into a map.
func TabsToMapFile(filename, sep string, kCol, vCol int) (map[string]string, error) {
f, err := os.Open(filename)
if err != nil {
return nil, err
}
defer f.Close()
return TabsToMap(f, sep, kCol, vCol)
}
// TabsToMap read from a reader and turns values from kCol, vCol columns
// (1-indexed) into a map.
func TabsToMap(r io.Reader, sep string, kCol, vCol int) (map[string]string, error) {
var (
br = bufio.NewReader(r)
m = make(map[string]string)
line, k, v string
fields []string
err error
)
for {
line, err = br.ReadString('\n')
if err == io.EOF {
return m, nil
}
if err != nil {
return nil, err
}
fields = strings.Split(line, sep)
if len(fields) > kCol-1 && len(fields) > vCol-1 {
k = strings.TrimSpace(fields[kCol-1])
v = strings.TrimSpace(fields[vCol-1])
m[k] = v
} else {
return nil, fmt.Errorf("invalid line: %v (%v fields, %v, %v)", line, len(fields), kCol, vCol)
}
}
return m, nil
}
|
