private void CheckValidPlaceable(string input, string rest = "")
{
var cs = NCS(input);
L20n.FTL.AST.INode result;
Assert.IsTrue(Placeable.PeekAndParse(cs, out result));
Assert.IsNotNull(result);
Assert.AreEqual(rest, cs.ReadUntilEnd());
Assert.AreEqual(typeof(L20n.FTL.AST.Placeable), result.GetType());
}
// '"' (placeable | quoted-text)* '"'
public static FTL.AST.Pattern ParseQuoted(CharStream cs)
{
cs.SkipCharacter('"');
FTL.AST.Pattern pattern = new FTL.AST.Pattern(true);
FTL.AST.INode child;
while (cs.PeekNext() != '"')
{
if (Placeable.PeekAndParse(cs, out child))
{
pattern.AddChild(child);
continue;
}
// it's not a placeable, and we haven't seen a quote,
// so it must be a quoted-text
child = AnyText.ParseQuoted(cs);
pattern.AddChild(child);
}
cs.SkipCharacter('"');
return(pattern);
}
private static FTL.AST.INode ParseUnquotedChild(CharStream cs)
{
FTL.AST.INode child;
if (Placeable.PeekAndParse(cs, out child))
{
return(child);
}
if (AnyText.PeekAndParseBlock(cs, out child))
{
return(child);
}
// as long as we don't have a newline char,
// we'll assume it's an unquoted-child
if (AnyText.PeekUnquoted(cs))
{
return(AnyText.ParseUnquoted(cs));
}
// return null if no child could be found
return(null);
}
// NL __ '|' __ (unquoted-text | placeable)+
public static bool PeekAndParseBlock(CharStream cs, out FTL.AST.INode result)
{
char next = cs.PeekNext();
// if next char isn't a NewLine Character, we know for sure we
// are not dealing with a block-text
if (CharStream.IsEOF(next) || !CharStream.IsNL(next))
{
result = null;
return(false);
}
// from here on out, we're still not sure if we're dealing with a block-text
// thus we start buffering so we can go back in time
// here we check if we have the following pattern: `NL __ '|'`
int bufferPos = cs.Position;
NewLine.Parse(cs);
WhiteSpace.Parse(cs);
// if the next unbuffered char is not '|' we're not dealing with a block-text
// and can return;
if (cs.PeekNext() != '|')
{
cs.Rewind(bufferPos);
result = null;
return(false);
}
// we know for sure we're dealing with a block-text,
// buffer can be flushed and we can start checking for more lines as well;
FTL.AST.INode line;
FTL.AST.BlockText blockText = new FTL.AST.BlockText();
do
{
cs.SkipNext(); // skip '|'
WhiteSpace.Parse(cs);
if (!Placeable.PeekAndParse(cs, out line))
{
// it's not a placeable, so it must be unquoted-text
line = ParseUnquoted(cs);
}
// add line
blockText.AddLine(line);
// peek if next char is a newline char
// otherwise we can stop early with trying
next = cs.PeekNext();
if (CharStream.IsEOF(next) || !CharStream.IsNL(next))
{
break;
}
// check if we have more lines
bufferPos = cs.Position;
NewLine.Parse(cs);
WhiteSpace.Parse(cs);
// as long as the next char is '|'
// we'll keep looping
if (cs.PeekNext() != '|')
{
cs.Rewind(bufferPos);
break;
}
} while(true);
result = blockText;
return(true);
}