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package graphql.parser;

import graphql.Internal;

import graphql.language.SourceLocation;

import org.antlr.v4.runtime.Token;

import java.util.List;

@Internal

public class AntlrHelper {

public static SourceLocation createSourceLocation(MultiSourceReader multiSourceReader, int antrlLine, int charPositionInLine) {

// multi source reader lines are 0 based while Antler lines are 1's based

//

// Antler columns ironically are 0 based - go figure!

//

int tokenLine = antrlLine - 1;

MultiSourceReader.SourceAndLine sourceAndLine = multiSourceReader.getSourceAndLineFromOverallLine(tokenLine);

//

// graphql spec says line numbers and columns start at 1

int line = sourceAndLine.getLine() + 1;

int column = charPositionInLine + 1;

return new SourceLocation(line, column, sourceAndLine.getSourceName());

}

public static SourceLocation createSourceLocation(MultiSourceReader multiSourceReader, Token token) {

return AntlrHelper.createSourceLocation(multiSourceReader, token.getLine(), token.getCharPositionInLine());

}

/* grabs 3 lines before and after the syntax error */

public static String createPreview(MultiSourceReader multiSourceReader, int antrlLine) {

int line = antrlLine - 1;

StringBuilder sb = new StringBuilder();

int startLine = line - 3;

int endLine = line + 3;

List<String> lines = multiSourceReader.getData();

for (int i = 0; i < lines.size(); i++) {

if (i >= startLine && i <= endLine) {

sb.append(lines.get(i)).append('\n');

}

}

return sb.toString();

}

}