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package org.jcamp.parser;

import java.util.ArrayList;
/**
 * static helper functions.
 * @author Thomas Weber
 */
public class Utils {
    /**
     * remove JCAMP line comments from String text
     * @return java.lang.String
     * @param text java.lang.String
     */
    public static String extractComments(String text) {
        StringBuffer tmp = new StringBuffer();
        int i = 0;
        int n = text.length();
        char c0, c1;
        outer : for (i = 0; i < n; i++) {
            c0 = text.charAt(i);
            if (c0 == '$') {
                i++;
                if (i < n) {
                    c1 = text.charAt(i);
                    if (c1 != '$') {
                        continue;
                    }
                } else {
                    continue;
                }
                i++;
                // eat chars till linefeed
                while (i < n) {
                    c0 = text.charAt(i);
                    tmp.append(c0);
                    if (c0 != '\n' && c0 != '\r') {
                        i++;
                    } else {
                        continue outer;
                    }
                }
            }
        }
        return tmp.toString();
    }
    /**
     * normalize label as in JCAMP standard:
     * remove ' ', '_', '-','/' and make upper case
     * @param rawLabelName
     * @return String normalized string
     */
    public static String normalizeLabel(String rawLabelName) {
        StringBuffer tmp = new StringBuffer();
        for (int i = 0; i < rawLabelName.length(); i++) {
            switch (rawLabelName.charAt(i)) {
                case ' ' :
                case '_' :
                case '-' :
                case '/' :
                    break;
                default :
                    tmp.append(Character.toUpperCase(rawLabelName.charAt(i)));
            }
        }
        return tmp.toString();
    }
    /**
     * change all whitespace chars to ' ', collapsing more than one ws into one.
     * 
     * @return java.lang.String
     * @param orig java.lang.String
     */
    public static String normalizeWhitespace(String orig) {
        StringBuffer normal = new StringBuffer();
        boolean inWS = false;
        for (int i = 0; i < orig.length(); i++) {
            char c = orig.charAt(i);
            if (Character.isWhitespace(c) && !inWS) {
                normal.append(' ');
                inWS = true;
            } else {
                normal.append(c);
                inWS = false;
            }
        }
        return normal.toString();
    }
    /**
     * remove JCAMP line comments from String text
     * @return java.lang.String
     * @param text java.lang.String
     */
    public static String removeComments(String text) {
        StringBuffer tmp = new StringBuffer();
        int i = 0;
        int n = text.length();
        char c0, c1;
        outer : for (i = 0; i < n; i++) {
            c0 = text.charAt(i);
            if (c0 == '$') {
                i++;
                if (i < n) {
                    c1 = text.charAt(i);
                    if (c1 != '$') {
                        tmp.append(c0).append(c1);
                        continue;
                    }
                } else {
                    tmp.append(c0);
                    continue;
                }
                i++;
                // eat chars till linefeed
                while (i < n) {
                    c0 = text.charAt(i);
                    if (c0 != '\n' && c0 != '\r') {
                        i++;
                    } else {
                        tmp.append(c0);
                        continue outer;
                    }
                }
            } else
                tmp.append(c0);
        }
        return tmp.toString();
    }
    /**
     * split String with comma separated values into a trimmed String array.
     * @param line
     * @return String[]
     */
    public static String[] splitStringCSV(String line) {
        line = removeComments(line);
        ArrayList tmp = new ArrayList();
        int pos = 0;
        int len = line.length();
        StringBuffer entry = new StringBuffer();
        while (pos < len) {
            char c = line.charAt(pos);
            if (c == ',') {
                tmp.add(entry.toString());
                entry.setLength(0);
            } else
                entry.append(c);
            pos++;
        }
        tmp.add(entry.toString());
        String[] arr = new String[tmp.size()];
        for (int i = 0; i < arr.length; i++)
            arr[i] = ((String) tmp.get(i)).trim();
        return arr;
    }
}