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package main
import (
"os"
"fmt"
"io"
"strconv"
"encoding/csv"
)
func parseTable(filename string) (map[int32]uint16, error) {
f, err := os.Open(filename)
if err != nil {
eprintf("%v\n", err)
}
defer f.Close()
tbl := make(map[int32]uint16)
rdr := csv.NewReader(f)
for {
err := parseRow(rdr, tbl)
if err == io.EOF {
return tbl, nil
} else if err != nil {
return nil, fmt.Errorf("%s:%v", filename, err)
}
}
}
func parseRow(rdr *csv.Reader, tbl map[int32]uint16) error {
row, err := rdr.Read()
if err != nil {
return err
}
if len(row) != 2 {
line, _ := rdr.FieldPos(0)
return fmt.Errorf("%d: malformed row", line)
}
key, err := strconv.ParseInt(row[0], 10, 32)
if err != nil {
line, col := rdr.FieldPos(0)
return fmt.Errorf("%d:%d: %v", line, col, err)
}
val, err := strconv.ParseUint(row[1], 10, 16)
if err != nil {
line, col := rdr.FieldPos(1)
return fmt.Errorf("%d:%d: %v", line, col, err)
}
if _, ok := tbl[int32(key)]; ok {
line, col := rdr.FieldPos(0)
return fmt.Errorf("%d: %d: duplicate key %d", line, col, key)
}
tbl[int32(key)] = uint16(val)
return nil
}
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