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internal/data/i18n.go

@@ -0,0 +1,85 @@
+package data
+
+import (
+	"bufio"
+	"bytes"
+	"fmt"
+	"os"
+	"path/filepath"
+	"strconv"
+)
+
+// WH40K has basic text internationalisation capabilities based on a <lang>.dta
+// file that maps string IDs to messages
+type I18n struct {
+	Name    string
+	mapping map[int]string
+}
+
+// FIXME: this should be put into the config file maybe, or detected from a list
+// of possibilities?
+const (
+	I18nFile = "USEng.dta"
+)
+
+func LoadI18n(filename string) (*I18n, error) {
+	f, err := os.Open(filename)
+	if err != nil {
+		return nil, err
+	}
+
+	defer f.Close()
+
+	out := &I18n{
+		Name:    filepath.Base(filename),
+		mapping: make(map[int]string),
+	}
+
+	scanner := bufio.NewScanner(f)
+	for i := 0; scanner.Scan(); i++ {
+		// Remove comments from lines
+		line := bytes.TrimSpace(bytes.SplitN(scanner.Bytes(), []byte("//"), 2)[0])
+
+		// Ignore empty lines
+		if len(line) == 0 {
+			continue
+		}
+
+		// Lines are expected to be in this format:
+		// <number> "text that may include \" or not"
+		parts := bytes.SplitN(line, []byte(" "), 2)
+		if len(parts) != 2 {
+			return nil, fmt.Errorf("Bad line in %v at %v: %q", filename, i, scanner.Text())
+		}
+
+		num, err := strconv.Atoi(string(parts[0]))
+		if err != nil {
+			return nil, err
+		}
+
+		// Cut off the leading and trailing quote characters of the string
+		val := parts[1]
+		val = val[1 : len(val)-1]
+
+		// TODO: Replace certain escape characters with their literals?
+
+		out.mapping[num] = string(val)
+	}
+
+	if err := scanner.Err(); err != nil {
+		return nil, err
+	}
+
+	return out, nil
+}
+
+func (n *I18n) Len() int {
+	return len(n.mapping)
+}
+
+// Puts the internationalized string into `out` if `in` matches a known ID
+func (n *I18n) Replace(in int, out *string) {
+	if str, ok := n.mapping[in]; ok {
+		*out = str
+	}
+}