internal static IList <XSharpToken> GetTokensUnderCursor(XSharpSearchLocation location, out CompletionState state)
{
var tokens = GetTokenList(location, out state, true, true).Where((t) => t.Channel == XSharpLexer.DefaultTokenChannel).ToList();
// Find "current" token
if (tokens.Count > 0)
{
var tokenUnderCursor = tokens.Count - 1;
for (int i = tokens.Count - 1; i >= 0; i--)
{
var token = tokens[i];
if (token.StartIndex <= location.Position && token.StopIndex >= location.Position)
{
tokenUnderCursor = i;
break;
}
}
var selectedToken = tokens[tokenUnderCursor];
var nextToken = tokenUnderCursor < tokens.Count - 1 ? tokens[tokenUnderCursor + 1] : null;
bool done = false;
switch (selectedToken.Type)
{
case XSharpLexer.NAMEOF:
case XSharpLexer.TYPEOF:
case XSharpLexer.SIZEOF:
case XSharpLexer.SELF:
case XSharpLexer.SUPER:
if (nextToken != null && nextToken.Type == XSharpLexer.LPAREN)
{
return(tokens);
}
break;
default:
if (XSharpLexer.IsKeyword(selectedToken.Type))
{
tokens.Clear();
tokens.Add(selectedToken);
return(tokens);
}
break;
}
// When we are not on a Keyword then we need to walk back in the tokenlist to see
// if we can evaluate the expression
// This could be:
// System.String.Compare() // static method cal or method call
// SomeVar:MethodCall() // method call
// Left(...) // function call
// SomeId // local, global etc
// SomeType.Id // Static property or normal property
// SomeVar:Id // Instance field or property
// If the token list contains with a RCURLY, RBRKT or RPAREN
// Then strip everything until the matching LCURLY, LBRKT or LPAREN is found
var list = new XSharpTokenList(tokens);
tokens = new List <XSharpToken>();
while (!list.Eoi())
{
var token = list.ConsumeAndGet();
switch (token.Type)
{
case XSharpLexer.LCURLY:
tokens.Add(token);
if (list.Contains(XSharpLexer.RCURLY))
{
// this may return false when the RCURLY belongs to another LCURLY
if (list.ConsumeUntilEndToken(XSharpLexer.RCURLY, out var endToken))
{
tokens.Add(endToken);
}
}
break;
case XSharpLexer.LPAREN:
tokens.Add(token);
if (list.Contains(XSharpLexer.RPAREN))
{
// this may return false when the RPAREN belongs to another LPAREN
if (list.ConsumeUntilEndToken(XSharpLexer.RPAREN, out var endToken))
{
tokens.Add(endToken);
}
}
break;
case XSharpLexer.LBRKT:
tokens.Add(token);
if (list.Contains(XSharpLexer.RBRKT))
{
// this may return false when the RBRKT belongs to another LBRKT
if (list.ConsumeUntilEndToken(XSharpLexer.RBRKT, out var endToken))
{
tokens.Add(endToken);
}
}
break;
case XSharpLexer.DOT:
case XSharpLexer.COLON:
case XSharpLexer.SELF:
case XSharpLexer.SUPER:
tokens.Add(token);
break;
default:
tokens.Add(token);
if (XSharpLexer.IsOperator(token.Type))
{
done = true;
}
if (token.Type == XSharpLexer.VAR)
{
done = true;
}
else if (XSharpLexer.IsKeyword(token.Type) &&
!XSharpLexer.IsPositionalKeyword(token.Type)
)
{
done = true;
}
break;
}
}
// now result has the list of tokens starting with the cursor
// we only keep:
// ID, DOT, COLON, LPAREN, LBRKT, RBRKT
// when we detect another token we truncate the list there
if (tokens.Count > 0)
{
var lastType = tokens[0].Type;
for (int i = tokenUnderCursor + 1; i < tokens.Count && !done; i++)
{
var token = tokens[i];
switch (token.Type)
{
case XSharpLexer.ID:
case XSharpLexer.DOT:
case XSharpLexer.COLON:
case XSharpLexer.LPAREN:
case XSharpLexer.LCURLY:
case XSharpLexer.LBRKT:
lastType = tokens[i].Type;
break;
case XSharpLexer.LT:
int gtPos = findTokenInList(tokens, i + 1, XSharpLexer.GT);
if (lastType == XSharpLexer.ID && gtPos > 0)
{
gtPos += 1;
tokens.RemoveRange(gtPos, tokens.Count - gtPos);
done = true;
break;
}
else
{
goto default;
}
default:
tokens.RemoveRange(i, tokens.Count - i);
done = true;
break;
}
}
}
}
// check for extra lparen, lcurly at the end
int count = tokens.Count;
if (count > 2 && count < tokens.Count - 2)
{
if (tokens[count - 2].Type == XSharpLexer.LPAREN)
{
switch (tokens[count - 1].Type)
{
case XSharpLexer.LPAREN:
case XSharpLexer.LCURLY:
tokens.RemoveAt(count - 1);
break;
}
}
}
return(tokens);
}
internal static List <XSharpToken> GetTokenList(XSharpSearchLocation location, out CompletionState state,
bool includeKeywords = false, bool underCursor = false)
{
location = AdjustStartLineNumber(location);
var line = getLineFromBuffer(location);
//
state = CompletionState.General;
if (line.Count == 0)
{
return(line);
}
// if the token appears after comma or paren then strip the tokens
// now look forward and find the first token that is on or after the triggerpoint
var result = new List <XSharpToken>();
var last = XSharpLexer.Eof;
bool allowdot = location.Project?.ParseOptions?.AllowDotForInstanceMembers ?? false;
var cursorPos = location.Position;
var done = false;
var list = new XSharpTokenList(line);
while (!done && !list.Eoi())
{
var token = list.ConsumeAndGet();
int openToken = 0;
XSharpToken closeToken = null;
bool isHit = token.StartIndex <= cursorPos && token.StopIndex >= cursorPos && underCursor;
bool isNotLast = token.StopIndex < location.Position - 1;
if (token.StartIndex > cursorPos)
{
// after the cursor we only include the open tokens
// so we can see if the id under the cursor is a method, constructor etc
switch (token.Type)
{
case XSharpLexer.LPAREN:
case XSharpLexer.LCURLY:
case XSharpLexer.LBRKT:
break;
case XSharpLexer.LT:
// if this is a generic type
// then add the complete
bool first = true;
bool endoflist = false;
while (!endoflist)
{
endoflist = true;
if (list.La1 == XSharpLexer.ID || XSharpLexer.IsType(list.La1))
{
if (list.La2 == XSharpLexer.GT || list.La2 == XSharpLexer.COMMA)
{
if (first)
{
result.Add(token);
first = false;
}
result.Add(list.ConsumeAndGet()); // la1
result.Add(list.ConsumeAndGet()); // la2
endoflist = false;
}
}
}
continue;
default:
done = true;
break;
}
if (done)
{
continue;
}
}
switch (token.Type)
{
// after these tokens we "restart" the list
case XSharpLexer.EOS:
if (token.Position < cursorPos && token != line.Last())
{
// an EOS inside a line before the cursor
// so there are 2 or more statements on the same line
// clear the first statement
result.Clear();
state = CompletionState.General;
}
else
{
// Exit loop, ignore the rest of the statements
done = true;
}
continue;
case XSharpLexer.WS:
case XSharpLexer.Eof:
continue;
case XSharpLexer.TO:
case XSharpLexer.UPTO:
case XSharpLexer.DOWNTO:
case XSharpLexer.IN:
if (!isHit)
{
result.Clear();
if (isNotLast) // there has to be a space after the token
{
state = CompletionState.General;
}
else
{
state = CompletionState.None;
}
}
else
{
result.Add(token);
}
break;
case XSharpLexer.LCURLY:
state = CompletionState.Constructors;
result.Add(token);
break;
case XSharpLexer.LPAREN:
state = CompletionState.StaticMembers | CompletionState.InstanceMembers;
result.Add(token);
break;
case XSharpLexer.LBRKT:
state = CompletionState.Brackets;
result.Add(token);
break;
case XSharpLexer.ID:
case XSharpLexer.NAMEOF:
case XSharpLexer.TYPEOF:
case XSharpLexer.SIZEOF:
result.Add(token);
break;
case XSharpLexer.RCURLY:
case XSharpLexer.RPAREN:
case XSharpLexer.RBRKT:
bool add = true;
if (result.Count > 0 && token == list.LastOrDefault)
{
var lasttoken = result.Last();
if (lasttoken.Type == XSharpLexer.COLON ||
lasttoken.Type == XSharpLexer.DOT)
{
// closing char after colon or dot
add = false;
done = true;
}
}
if (add)
{
result.Add(token);
// delete everything between parens, curly braces and brackets closing token before cursor pos
if (token.Position < location.Position)
{
closeToken = token;
if (token.Type == XSharpLexer.RCURLY)
{
openToken = XSharpLexer.LCURLY;
}
else if (token.Type == XSharpLexer.RPAREN)
{
openToken = XSharpLexer.LPAREN;
}
else if (token.Type == XSharpLexer.RBRKT)
{
openToken = XSharpLexer.LBRKT;
}
}
}
break;
case XSharpLexer.STATIC: // These tokens are all before a namespace of a (namespace dot) type
if (isNotLast) // there has to be a space after the token
{
state = CompletionState.General;
}
else
{
state = CompletionState.None;
}
break;
case XSharpLexer.USING:
if (isNotLast) // there has to be a space after the token
{
if (list.Expect(XSharpLexer.STATIC))
{
state = CompletionState.Namespaces | CompletionState.Types;
result.Clear();
}
else if (list.La1 == XSharpLexer.ID)
{
state = CompletionState.Namespaces;
result.Clear();
}
}
break;
case XSharpLexer.MEMBER:
if (isNotLast) // there has to be a space after the token
{
state = CompletionState.StaticMembers;
}
else
{
state = CompletionState.None;
}
break;
case XSharpLexer.AS:
case XSharpLexer.IS:
case XSharpLexer.REF:
case XSharpLexer.INHERIT:
if (!isHit)
{
result.Clear();
}
else
{
result.Add(token);
}
if (isNotLast) // there has to be a space after the token
{
state = CompletionState.Namespaces | CompletionState.Types;
}
else
{
state = CompletionState.None;
}
break;
case XSharpLexer.IMPLEMENTS:
result.Clear();
if (isNotLast)
{
state = CompletionState.Namespaces | CompletionState.Interfaces;
}
else
{
state = CompletionState.None;
}
break;
case XSharpLexer.COLON:
state = CompletionState.InstanceMembers;
result.Add(token);
break;
case XSharpLexer.DOT:
if (!state.HasFlag(CompletionState.Namespaces))
{
state = CompletionState.Namespaces | CompletionState.Types | CompletionState.StaticMembers;
if (allowdot)
{
state |= CompletionState.InstanceMembers;
}
}
result.Add(token);
break;
case XSharpLexer.QMARK:
if (result.Count != 0) // when at start of line then do not add. Otherwise it might be a Nullable type or conditional access expression
{
result.Add(token);
}
break;
case XSharpLexer.QQMARK:
if (result.Count != 0) // when at start of line then do not add. Otherwise it might be a binary expression
{
result.Add(token);
}
break;
case XSharpLexer.BACKSLASH:
case XSharpLexer.BACKBACKSLASH:
// this should only be seen at start of line
// clear the list to be sure
result.Clear();
break;
case XSharpLexer.NAMESPACE:
state = CompletionState.Namespaces;
break;
case XSharpLexer.COMMA:
case XSharpLexer.ASSIGN_OP:
case XSharpLexer.COLONCOLON:
case XSharpLexer.SELF:
case XSharpLexer.SUPER:
state = CompletionState.General;
result.Add(token);
break;
default:
state = CompletionState.General;
if (XSharpLexer.IsOperator(token.Type))
{
result.Add(token);
}
else if (XSharpLexer.IsType(token.Type))
{
result.Add(token);
}
else if (XSharpLexer.IsConstant(token.Type))
{
result.Add(token);
}
else if (XSharpLexer.IsKeyword(token.Type) && includeKeywords) // For code completion we want to include keywords
{
token.Text = XSettings.FormatKeyword(token.Text);
result.Add(token);
}
break;
}
last = token.Type;
// remove everything between parens, curly braces or brackets when the closing token is before the cursor
if (openToken != 0 && closeToken != null)
{
var iLast = result.Count - 1;
int count = 0;
while (iLast >= 0 && result[iLast] != closeToken)
{
iLast--;
}
int closeType = closeToken.Type;
while (iLast >= 0)
{
var type = result[iLast].Type;
if (type == closeType)
{
count += 1;
}
else if (type == openToken)
{
count -= 1;
if (count == 0)
{
if (iLast < result.Count - 1)
{
result.RemoveRange(iLast + 1, result.Count - iLast - 2);
}
break;
}
}
iLast -= 1;
}
}
}
// when the list ends with a comma, drop the ending comma. Why ?
if (result.Count > 0)
{
var end = result.Last();
if (end.Type == XSharpLexer.COMMA)
{
result.RemoveAt(result.Count - 1);
}
}
return(result);
}
