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|
package mintages
import (
"bufio"
"fmt"
"io"
"os"
"path/filepath"
"strconv"
"strings"
"time"
"unicode"
)
type SyntaxError struct {
expected, got string
file string
linenr int
}
func (e SyntaxError) Error() string {
return fmt.Sprintf("%s:%d: syntax error: expected %s but got %s",
e.file, e.linenr, e.expected, e.got)
}
type coinset [8]int
type Data struct {
StartYear int
Circ, BU, Proof []coinset
}
func ForCountry(code string) (Data, error) {
path := filepath.Join("data", "mintages", code)
f, err := os.Open(path)
if err != nil {
return Data{}, err
}
defer f.Close()
return parse(f, path)
}
func parse(reader io.Reader, file string) (Data, error) {
var (
data Data // Our data struct
slice *[]coinset // Where to append mintages
)
scanner := bufio.NewScanner(reader)
for linenr := 1; scanner.Scan(); linenr++ {
line := scanner.Text()
tokens := strings.FieldsFunc(strings.TrimSpace(line), unicode.IsSpace)
switch {
case len(tokens) == 0:
continue
case tokens[0] == "BEGIN":
if len(tokens)-1 != 1 {
return Data{}, SyntaxError{
expected: "single argument to ‘BEGIN’",
got: fmt.Sprintf("%d arguments", len(tokens)-1),
file: file,
linenr: linenr,
}
}
arg := tokens[1]
switch arg {
case "CIRC":
slice = &data.Circ
case "BU":
slice = &data.BU
case "PROOF":
slice = &data.Proof
default:
if !isNumeric(arg, false) {
return Data{}, SyntaxError{
expected: "‘CIRC’, ‘BU’, ‘PROOF’, or a year",
got: arg,
file: file,
linenr: linenr,
}
}
data.StartYear, _ = strconv.Atoi(arg)
}
case isNumeric(tokens[0], true), tokens[0] == "?":
switch {
case slice == nil:
return Data{}, SyntaxError{
expected: "coin type declaration",
got: tokens[0],
file: file,
linenr: linenr,
}
case data.StartYear == 0:
return Data{}, SyntaxError{
expected: "start year declaration",
got: tokens[0],
file: file,
linenr: linenr,
}
}
numcoins := len(coinset{})
tokcnt := len(tokens)
if tokcnt != numcoins {
word := "entries"
if tokcnt == 1 {
word = "entry"
}
return Data{}, SyntaxError{
expected: fmt.Sprintf("%d mintage entries", numcoins),
got: fmt.Sprintf("%d %s", tokcnt, word),
file: file,
linenr: linenr,
}
}
var row coinset
for i, tok := range tokens {
if tok == "?" {
row[i] = -1
} else {
row[i] = atoiWithDots(tok)
}
}
*slice = append(*slice, row)
default:
return Data{}, SyntaxError{
expected: "‘BEGIN’ directive or mintage row",
got: fmt.Sprintf("invalid token ‘%s’", tokens[0]),
file: file,
linenr: linenr,
}
}
}
/* Pad rows of ‘unknown’ mintages at the end of each set of mintages
for each year that we haven’t filled in info for. This avoids
things accidentally breaking if the new year comes and we forget
to add extra rows. */
for _, ms := range [...]*[]coinset{&data.Circ, &data.BU, &data.Proof} {
finalYear := len(*ms) + data.StartYear - 1
missing := time.Now().Year() - finalYear
for i := 0; i < missing; i++ {
*ms = append(*ms, coinset{-1, -1, -1, -1, -1, -1, -1, -1})
}
}
return data, nil
}
func isNumeric(s string, dot bool) bool {
for _, ch := range s {
switch ch {
case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
case '.':
if !dot {
return false
}
default:
return false
}
}
return true
}
func atoiWithDots(s string) int {
n := 0
for _, ch := range s {
if ch == '.' {
continue
}
n = n*10 + int(ch) - '0'
}
return n
}
|
