Parse a line of CSV data and return it as a list of strings

Description

Demo Code


//package com.java2s;
import java.util.ArrayList;

public class Main {
    /**// ww w  .j  ava  2s.  com
     * Parse a line of CSV data and return it as a list of strings
     * @param data The CSV data to parse.
     * @param delimiter The delimiter to use
     * @return  The individual fields.
     */
    public static ArrayList parseCSV(String data, String delimiter) {

        String enclosure = "\"";
        String newline = "\n";

        int pos = -1;
        int last_pos = -1;
        int end = data.length();

        int row = 0;
        boolean quote_open = false;
        boolean trim_quote = false;

        ArrayList returnCells = new ArrayList();

        // Create a continuous loop
        for (int i = -1;; ++i) {
            ++pos;
            // Get the positions
            int comma_pos = data.indexOf(delimiter, pos);
            int quote_pos = data.indexOf(enclosure, pos);
            int newline_pos = data.indexOf(newline, pos);

            // Which one comes first?
            pos = min((comma_pos == -1) ? end : comma_pos,
                    (quote_pos == -1) ? end : quote_pos,
                    (newline_pos == -1) ? end : newline_pos);

            // Cache it
            //String character = (isset($data[$pos])) ? $data[$pos] : null;
            String character = "";

            boolean done = false;

            if (pos >= data.length() - 1) {
                done = true;
            } else {
                character = data.substring(pos, pos + 1);
            }

            if (pos == end) {
                done = true;
            }

            // It it a special character?
            if (done || (character.compareTo(delimiter) == 0)
                    || character.compareTo(newline) == 0) {

                // Ignore it as we're still in a quote
                if (quote_open && !done) {
                    continue;
                }

                int length = pos - ++last_pos;

                //# Is the last thing a newline?
                if (character.compareTo(newline) == 0) {
                    //# Well then get rid of it
                    --length;
                }

                // Is the last thing a quote?
                if (trim_quote) {
                    // Well then get rid of it
                    --length;
                }

                String nextCell = "";

                // Get all the contents of this column
                if (length > 0) {
                    nextCell = data.substring(last_pos, last_pos + length)
                            .replace(enclosure + enclosure, enclosure);
                }

                returnCells.add(nextCell);

                //$return[$row][] = thing(i);

                // And we're done
                if (done) {
                    break;
                }

                // Save the last position
                last_pos = pos;

                // Next row?
                if (character.compareTo(newline) == 0) {
                    ++row;
                }

                trim_quote = false;
            }
            // Our quote?
            else if (character.compareTo(enclosure) == 0) {

                // Toggle it
                if (quote_open == false) {
                    // It's an opening quote
                    quote_open = true;
                    trim_quote = false;

                    // Trim this opening quote?
                    if (last_pos + 1 == pos) {
                        ++last_pos;
                    }
                } else {
                    // It's a closing quote
                    quote_open = false;

                    // Trim the last quote?
                    trim_quote = true;
                }
            }
        }

        return returnCells;
    }

    /**
     * Return the minimum of three values.
     * @param a
     * @param b
     * @param c
     * @return
     */
    public static int min(int a, int b, int c) {
        int low1 = Math.min(a, b);
        int low2 = Math.min(b, c);
        return Math.min(low1, low2);
    }
}
Parse a line of CSV data and return it as a list of strings - Java File Path IO

Description

Demo Code

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