public IEnumerable<IDocumentPart> Parse (Lexer lexer)
{
bool have_parsed_headers = false;
foreach (var unit in ParseUnits (lexer)) {
if (have_parsed_headers) {
yield return unit;
continue;
}
var is_header_message = false;
foreach (var message in unit.Messages) {
if (!message.HasValue) {
break;
} else if (message.Type == MessageType.SingularIdentifier && message.Value == String.Empty) {
is_header_message = true;
} else if (message.Type == MessageType.SingularString && is_header_message) {
var headers = new HeaderCollection ();
foreach (var header in ParseHeaders (message)) {
have_parsed_headers = true;
headers.Add (header);
}
if (have_parsed_headers) {
yield return headers;
} else {
yield return unit;
}
break;
}
}
}
}
public SyntaxException(Lexer lexer, string message)
: base(String.Format ("Syntax error: \"{0}\": {1}:{2},{3} ('{4}')",
message, lexer.Path, lexer.Line, lexer.Column, lexer.Peek ()))
{
}
public SyntaxException(Lexer lexer, string message)
: base(String.Format("Syntax error: \"{0}\": {1}:{2},{3}",
message, lexer.Path, lexer.Line, lexer.Column))
{
}
private Message ParseIdentifier (Lexer lexer, Token.Identifier identifier)
{
var match = Regex.Match ((string)identifier, @"^msg(id|id_plural|str|str\[(\d+)\]|ctxt)$");
if (!match.Success) {
throw new SyntaxException (lexer, "invalid identifier: " + (string)identifier);
}
int plural_order;
MessageType type;
switch (match.Groups [1].Value) {
case "id":
type = MessageType.SingularIdentifier;
plural_order = -1;
break;
case "id_plural":
type = MessageType.PluralIdentifier;
plural_order = -1;
break;
case "str":
type = MessageType.SingularString;
plural_order = 0;
break;
case "ctxt":
type = MessageType.Context;
plural_order = -1;
break;
default:
if (match.Groups.Count == 3) {
type = MessageType.PluralString;
plural_order = Int32.Parse (match.Groups [2].Value);
} else {
throw new SyntaxException(lexer, "invalid identifier: " + (string)identifier);
}
break;
}
return new Message (identifier, type, plural_order);
}
private IEnumerable<Unit> ParseUnits (Lexer lexer)
{
var unit = new Unit ();
Token last_msgstr_token = null;
Message message = null;
foreach (var token in lexer.Lex ()) {
if (IsMsgstrToken (token)) {
last_msgstr_token = token;
} else if (IsStartOfUnitToken (token) && last_msgstr_token != null) {
last_msgstr_token = null;
yield return unit;
unit = new Unit ();
}
if (token is Token.Comment) {
unit.Add (new Comment ((Token.Comment)token));
} else if (token is Token.Identifier) {
message = ParseIdentifier (lexer, (Token.Identifier)token);
unit.Add (message);
} else if (token is Token.String) {
message.Value += (string)token;
}
}
yield return unit;
}