private matchEnterRule(model: ITokenizedModel, indentConverter: IIndentConverter, tabSize: number, line: number, oneLineAbove: number, oneLineAboveText?: string) {
let validPrecedingLine = oneLineAbove;
while (validPrecedingLine >= 1) {
// ship empty lines as empty lines just inherit indentation
let lineContent;
if (validPrecedingLine === oneLineAbove && oneLineAboveText !== undefined) {
lineContent = oneLineAboveText;
} else {
lineContent = model.getLineContent(validPrecedingLine);
}
let nonWhitespaceIdx = strings.lastNonWhitespaceIndex(lineContent);
if (nonWhitespaceIdx >= 0) {
break;
}
validPrecedingLine--;
}
if (validPrecedingLine < 1 || line > model.getLineCount()) {
return null;
}
let maxColumn = model.getLineMaxColumn(validPrecedingLine);
let enter = LanguageConfigurationRegistry.getEnterAction(model, new Range(validPrecedingLine, maxColumn, validPrecedingLine, maxColumn));
if (enter) {
let enterPrefix = enter.indentation;
let enterAction = enter.enterAction;
if (enterAction.indentAction === IndentAction.None) {
enterPrefix = enter.indentation + enterAction.appendText;
} else if (enterAction.indentAction === IndentAction.Indent) {
enterPrefix = enter.indentation + enterAction.appendText;
} else if (enterAction.indentAction === IndentAction.IndentOutdent) {
enterPrefix = enter.indentation;
} else if (enterAction.indentAction === IndentAction.Outdent) {
enterPrefix = indentConverter.unshiftIndent(enter.indentation) + enterAction.appendText;
}
let movingLineText = model.getLineContent(line);
if (this.trimLeft(movingLineText).indexOf(this.trimLeft(enterPrefix)) >= 0) {
let oldIndentation = strings.getLeadingWhitespace(model.getLineContent(line));
let newIndentation = strings.getLeadingWhitespace(enterPrefix);
let indentMetadataOfMovelingLine = LanguageConfigurationRegistry.getIndentMetadata(model, line);
if (indentMetadataOfMovelingLine & IndentConsts.DECREASE_MASK) {
newIndentation = indentConverter.unshiftIndent(newIndentation);
}
let newSpaceCnt = IndentUtil.getSpaceCnt(newIndentation, tabSize);
let oldSpaceCnt = IndentUtil.getSpaceCnt(oldIndentation, tabSize);
return newSpaceCnt - oldSpaceCnt;
}
}
return null;
}