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|
package cms
import (
"fmt"
"strconv"
"strings"
)
type simpleTable struct {
values map[string]string
lists map[string][]string
}
func parseSimpleTable(data string) (simpleTable, error) {
table := simpleTable{
values: map[string]string{},
lists: map[string][]string{},
}
for lineNo, raw := range strings.Split(data, "\n") {
line := strings.TrimSpace(raw)
if line == "" || strings.HasPrefix(line, "#") || strings.HasPrefix(line, "[[") {
continue
}
key, rawValue, ok := strings.Cut(line, "=")
if !ok {
return table, fmt.Errorf("line %d: expected key = value", lineNo+1)
}
key = strings.TrimSpace(key)
rawValue = strings.TrimSpace(rawValue)
if key == "" {
return table, fmt.Errorf("line %d: empty key", lineNo+1)
}
if strings.HasPrefix(rawValue, "[") {
list, err := parseStringList(rawValue)
if err != nil {
return table, fmt.Errorf("line %d: %w", lineNo+1, err)
}
table.lists[key] = list
continue
}
value, err := parseScalar(rawValue)
if err != nil {
return table, fmt.Errorf("line %d: %w", lineNo+1, err)
}
table.values[key] = value
}
return table, nil
}
func parseMetadata(data string) (simpleTable, error) {
table, err := parseSimpleTable(data)
if err == nil {
return table, nil
}
yamlTable, yamlErr := parseSimpleYAMLTable(data)
if yamlErr == nil {
return yamlTable, nil
}
return table, err
}
func parseSimpleYAMLTable(data string) (simpleTable, error) {
table := simpleTable{
values: map[string]string{},
lists: map[string][]string{},
}
for lineNo, raw := range strings.Split(data, "\n") {
line := strings.TrimSpace(raw)
if line == "" || strings.HasPrefix(line, "#") {
continue
}
key, rawValue, ok := strings.Cut(line, ":")
if !ok {
return table, fmt.Errorf("line %d: expected key: value", lineNo+1)
}
key = strings.TrimSpace(key)
rawValue = strings.TrimSpace(rawValue)
if key == "" {
return table, fmt.Errorf("line %d: empty key", lineNo+1)
}
if strings.HasPrefix(rawValue, "[") {
list, err := parseStringList(rawValue)
if err != nil {
return table, fmt.Errorf("line %d: %w", lineNo+1, err)
}
table.lists[key] = list
continue
}
if key == "tags" && strings.Contains(rawValue, ",") {
table.lists[key] = splitCommaList(rawValue)
continue
}
value, err := parseScalar(rawValue)
if err != nil {
return table, fmt.Errorf("line %d: %w", lineNo+1, err)
}
table.values[key] = value
}
return table, nil
}
func parseScalar(raw string) (string, error) {
raw = strings.TrimSpace(raw)
if raw == "" {
return "", nil
}
if strings.HasPrefix(raw, "\"") {
value, err := strconv.Unquote(raw)
if err != nil {
return "", err
}
return value, nil
}
return raw, nil
}
func splitCommaList(value string) []string {
var out []string
for _, part := range strings.Split(value, ",") {
part = strings.TrimSpace(part)
if part != "" {
out = append(out, part)
}
}
return out
}
func parseStringList(raw string) ([]string, error) {
raw = strings.TrimSpace(raw)
if !strings.HasPrefix(raw, "[") || !strings.HasSuffix(raw, "]") {
return nil, fmt.Errorf("expected string list")
}
raw = strings.TrimSpace(strings.TrimSuffix(strings.TrimPrefix(raw, "["), "]"))
if raw == "" {
return nil, nil
}
var values []string
for _, part := range strings.Split(raw, ",") {
value, err := parseScalar(strings.TrimSpace(part))
if err != nil {
return nil, err
}
if value != "" {
values = append(values, value)
}
}
return values, nil
}
func formatString(value string) string {
return strconv.Quote(value)
}
func formatStringList(values []string) string {
quoted := make([]string, 0, len(values))
for _, value := range values {
quoted = append(quoted, strconv.Quote(value))
}
return "[" + strings.Join(quoted, ", ") + "]"
}
func boolString(value bool) string {
if value {
return "true"
}
return "false"
}
|
