public static Ast GetContainingAstOfPosition(Ast fullAst, IScriptPosition position)
{
var visitor = new FindAstFromPositionVisitor(position);
fullAst.Visit(visitor);
return(visitor.GetAst());
}
public static KeywordContext BuildFromInput(
Ast ast,
IReadOnlyList <Token> tokens,
IScriptPosition cursorPosition)
{
// Now find the AST we're in
CompletionPositionContext positionContext = GetEffectiveScriptPosition(cursorPosition, tokens);
Ast containingAst = FindAstFromPositionVisitor.GetContainingAstOfPosition(ast, positionContext.LastNonNewlineToken.Extent.EndScriptPosition);
if (containingAst is null)
{
return(null);
}
// Find the command AST that we're in
CommandAst containingCommandAst = GetFirstParentCommandAst(containingAst);
var context = new KeywordContext
{
ContainingAst = containingAst,
ContainingCommandAst = containingCommandAst,
FullAst = ast,
LastTokenIndex = positionContext.LastTokenIndex,
LastToken = positionContext.LastToken,
LastNonNewlineToken = positionContext.LastNonNewlineToken,
EffectivePositionToken = positionContext.EffectivePositionToken,
Tokens = tokens,
Position = cursorPosition
};
// Build a list of the keyword ASTs we're in going up
Ast currAst = containingAst;
var commandAsts = new List <CommandAst>();
do
{
if (currAst is CommandAst commandAst)
{
commandAsts.Add(commandAst);
}
currAst = currAst.Parent;
} while (currAst != null);
// Then build the context list going back down
var keywordStack = new List <KeywordContextFrame>(commandAsts.Count);
int frameIndex = 0;
for (int i = commandAsts.Count - 1; i >= 0; i--)
{
keywordStack.Add(new KeywordContextFrame(context, frameIndex, commandAsts[i]));
frameIndex++;
}
context.KeywordStack = keywordStack;
return(context);
}
