Examples with InjectedLanguageManager com.intellij.lang.injection.InjectedLanguageManager used on opensource projects

Example 41 with InjectedLanguageManager

use of com.intellij.lang.injection.InjectedLanguageManager in project intellij-plugins by JetBrains.

the class DartServerCompletionContributor method getPrefixUsingServerData.

@Nullable
private static String getPrefixUsingServerData(@NotNull final CompletionParameters parameters, final int replacementOffset) {
    PsiElement element = parameters.getOriginalPosition();
    if (element == null)
        return null;
    final InjectedLanguageManager manager = InjectedLanguageManager.getInstance(element.getProject());
    final PsiFile injectedContext = parameters.getOriginalFile();
    final int completionOffset = manager.injectedToHost(injectedContext, parameters.getOffset());
    final TextRange range = manager.injectedToHost(injectedContext, element.getTextRange());
    // shouldn't happen
    if (completionOffset < range.getStartOffset() || completionOffset > range.getEndOffset())
        return null;
    // shouldn't happen
    if (replacementOffset > completionOffset)
        return null;
    while (element != null) {
        final int elementStartOffset = manager.injectedToHost(injectedContext, element.getTextRange().getStartOffset());
        if (elementStartOffset <= replacementOffset) {
            // that's good, we can use this element to calculate prefix
            break;
        }
        element = element.getParent();
    }
    if (element != null) {
        final int startOffset = manager.injectedToHost(injectedContext, element.getTextRange().getStartOffset());
        return element.getText().substring(replacementOffset - startOffset, completionOffset - startOffset);
    }
    return null;
}