org.simpleflatmapper.csv.parser.UnescapeCellPreProcessor Maven / Gradle / Ivy

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package org.simpleflatmapper.csv.parser;

public class UnescapeCellPreProcessor extends CellPreProcessor {

    private final TextFormat textFormat;

    public UnescapeCellPreProcessor(TextFormat textFormat) {
        this.textFormat = textFormat;
    }


    public final void newCell(char[] chars, int start, int end, CellConsumer cellConsumer, int state) {
        if ((state & CharConsumer.ESCAPED) == 0) {
            cellConsumer.newCell(chars, start, end - start);
        } else {
            unescape(chars, start + 1, end, cellConsumer);
        }
    }

    private void unescape(final char[] chars, int start, int end, CellConsumer cellConsumer) {
        char escapeChar = textFormat.escapeChar;
        for(int i = start; i < end - 1; i++) {
            if (chars[i] == escapeChar) {
                int destIndex = i;
                boolean escaped = true;
                for(i = i +1 ;i < end; i++) {
                    char c = chars[i];
                    if (c != escapeChar || escaped) {
                        chars[destIndex++] = c;
                        escaped = false;
                    } else {
                        escaped = true;
                    }
                }
                cellConsumer.newCell(chars, start, destIndex - start);
                return;
            }
        }

        int l = end - start;
        if (l >0 && chars[end -1] == escapeChar) {
            l --;
        }
        cellConsumer.newCell(chars, start, l);
    }

    @Override
    public final boolean ignoreLeadingSpace() {
        return false;
    }

}