static PoEntry ReadEntry(TextReader reader)
{
// Skip all the blank lines before the block of text
string line = string.Empty;
while (reader.PeekLine()?.Trim().Length == 0)
{
reader.ReadLine();
}
// If nothing to read, EOF
if (reader.Stream.EndOfStream)
{
return(null);
}
PoEntry entry = new PoEntry();
while (!reader.Stream.EndOfStream)
{
// Get the next line
line = reader.ReadLine();
// If it's blank, then this block finished
if (string.IsNullOrWhiteSpace(line))
{
break;
}
ParseLine(reader, entry, line);
}
return(entry);
}
/// <summary>
/// Convert the specified Binary stream into a PO object.
/// </summary>
/// <returns>The converted PO object.</returns>
/// <param name="source">Source binary stream.</param>
public Po Convert(IBinary source)
{
if (source == null)
{
throw new ArgumentNullException(nameof(source));
}
TextReader reader = new TextReader(source.Stream);
Po po = new Po();
// Read the header if any
PoEntry entry = ReadEntry(reader);
if (entry == null)
{
return(po);
}
if (entry.Original.Length == 0)
{
po.Header = Entry2Header(entry);
}
else
{
po.Add(entry);
}
// Read other entries
while ((entry = ReadEntry(reader)) != null)
{
po.Add(entry);
}
return(po);
}
static void MergeEntry(PoEntry current, PoEntry newEntry)
{
if (current.Translated != newEntry.Translated)
{
throw new InvalidOperationException(
"Tried to merge Po entries with same original text but " +
"different translations.");
}
if (newEntry.Reference != null)
{
current.Reference += "," + newEntry.Reference;
}
}
static PoHeader Entry2Header(PoEntry entry)
{
PoHeader header = new PoHeader();
var option = StringSplitOptions.RemoveEmptyEntries;
foreach (string line in entry.Translated.Split(new[] { '\n' }, option))
{
var fields = line.Split(new[] { ": " }, 2, StringSplitOptions.None);
if (fields.Length != 2)
{
throw new FormatException("Invalid format line: " + line);
}
ParseHeaderLine(header, fields[0], fields[1]);
}
return(header);
}
static void WriteEntry(PoEntry entry, TextWriter writer)
{
WriteIfNotEmpty(writer, "# {0}", entry.TranslatorComment);
WriteIfNotEmpty(writer, "#. {0}", entry.ExtractedComments);
WriteIfNotEmpty(writer, "#: {0}", entry.Reference);
WriteIfNotEmpty(writer, "#, {0}", entry.Flags);
WriteIfNotEmpty(writer, "#| msgctxt {0}", entry.PreviousContext);
WriteIfNotEmpty(writer, "#| msgid {0}", entry.PreviousOriginal);
if (!string.IsNullOrEmpty(entry.Context))
{
writer.Write("msgctxt ");
WriteWrappedString(writer, entry.Context);
}
writer.Write("msgid ");
WriteWrappedString(writer, entry.Original);
writer.Write("msgstr ");
WriteWrappedString(writer, entry.Translated);
}
/// <summary>
/// Add the specified entry.
/// </summary>
/// <param name="item">Entry to add. The ID must be unique.</param>
public void Add(PoEntry item)
{
if (item == null)
{
throw new ArgumentNullException(nameof(item));
}
if (string.IsNullOrEmpty(item.Original))
{
throw new FormatException(nameof(item.Original) + " is empty");
}
string key = GetKey(item);
if (searchEntries.ContainsKey(key))
{
MergeEntry(searchEntries[key], item);
}
else
{
searchEntries[key] = item;
entries.Add(item);
}
}
static void ParseLine(TextReader reader, PoEntry entry, string line)
{
string[] fields = line.Split(new[] { ' ' }, 2);
if (fields.Length != 2)
{
throw new FormatException("Invalid line format: " + line);
}
switch (fields[0])
{
case "#":
entry.TranslatorComment = ReadMultiLineComment(
reader,
fields[1].TrimStart(),
"# ");
break;
case "#.":
entry.ExtractedComments = ReadMultiLineComment(
reader,
fields[1],
"#.");
break;
case "#:":
entry.Reference = fields[1];
break;
case "#,":
entry.Flags = fields[1];
break;
case "#|":
string[] subfields = fields[1].Split(new[] { ' ' }, 2);
if (subfields[0] == "msgctxt")
{
entry.PreviousContext = subfields[1];
}
else if (subfields[0] == "msgid")
{
entry.PreviousOriginal = subfields[1];
}
else
{
throw new FormatException("Unknown previous field: " + line);
}
break;
case "msgctxt":
entry.Context = ReadMultiLineContent(reader, fields[1]);
break;
case "msgid":
entry.Original = ReadMultiLineContent(reader, fields[1]);
break;
case "msgstr":
entry.Translated = ReadMultiLineContent(reader, fields[1]);
break;
default:
throw new FormatException("Unknown line '" + line + "'");
}
}
static string GetKey(PoEntry entry)
{
return(GetKey(entry.Original, entry.Context));
}