public IListSource<LNode> Parse(IListSource<Token> input, ISourceFile file, IMessageSink msgs, Symbol inputType = null)
{
// For efficiency we'd prefer to re-use our _parser object, but
// when parsing lazily, we can't re-use it because another parsing
// operation could start before this one is finished. To force
// greedy parsing, we can call ParseStmtsGreedy(), but the caller may
// prefer lazy parsing, especially if the input is large. As a
// compromise I'll check if the source file is larger than a
// certain arbitrary size. Also, ParseExprs() is always greedy
// so we can always re-use _parser in that case.
bool exprMode = inputType == ParsingService.Exprs;
char _ = '\0';
if (inputType == ParsingService.Exprs || file.Text.TryGet(255, ref _)) {
LesParser parser = _parser;
if (parser == null)
_parser = parser = new LesParser(input, file, msgs);
else {
parser.ErrorSink = msgs;
parser.Reset(input.AsList(), file);
}
if (inputType == ParsingService.Exprs)
return parser.ExprList();
else
return parser.Start(new Holder<TokenType>(TokenType.Semicolon)).Buffered();
} else {
var parser = new LesParser(input, file, msgs);
return parser.Start(new Holder<TokenType>(TokenType.Semicolon)).Buffered();
}
}
public IListSource <LNode> Parse(IListSource <Token> input, ISourceFile file, IMessageSink msgs, Symbol inputType = null)
{
// For efficiency we'd prefer to re-use our _parser object, but
// when parsing lazily, we can't re-use it because another parsing
// operation could start before this one is finished. To force
// greedy parsing, we can call ParseStmtsGreedy(), but the caller may
// prefer lazy parsing, especially if the input is large. As a
// compromise I'll check if the source file is larger than a
// certain arbitrary size. Also, ParseExprs() is always greedy
// so we can always re-use _parser in that case.
bool exprMode = inputType == ParsingService.Exprs;
char _ = '\0';
if (inputType == ParsingService.Exprs || file.Text.TryGet(255, ref _))
{
LesParser parser = _parser;
if (parser == null)
{
_parser = parser = new LesParser(input, file, msgs);
}
else
{
parser.MessageSink = msgs;
parser.Reset(input, file);
}
if (inputType == ParsingService.Exprs)
{
return(parser.ParseExprs());
}
else
{
return(parser.ParseStmtsGreedy());
}
}
else
{
var parser = new LesParser(input, file, msgs);
return(parser.ParseStmtsLazy().Buffered());
}
}