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/*
 * Cay S. Horstmann & Gary Cornell, Core Java
 * Published By Sun Microsystems Press/Prentice-Hall
 * Copyright (C) 1997 Sun Microsystems Inc.
 * All Rights Reserved.
 *
 * Permission to use, copy, modify, and distribute this 
 * software and its documentation for NON-COMMERCIAL purposes
 * and without fee is hereby granted provided that this 
 * copyright notice appears in all copies. 
 * 
 * THE AUTHORS AND PUBLISHER MAKE NO REPRESENTATIONS OR 
 * WARRANTIES ABOUT THE SUITABILITY OF THE SOFTWARE, EITHER 
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A 
 * PARTICULAR PURPOSE, OR NON-INFRINGEMENT. THE AUTHORS
 * AND PUBLISHER SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED 
 * BY LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING 
 * THIS SOFTWARE OR ITS DERIVATIVES.
 */
/**
 * A class for formatting numbers that follows printf conventions.
 * Also implements C-like atoi and atof functions
 * @version 1.01 15 Feb 1996 
 * @author Cay Horstmann
 */
//package corejava;
package org.omscentral.modules.analysis.esp;

public class Format {

    /**
     * Formats the number following printf conventions.
     * Main limitation: Can only handle one format parameter at a time
     * Use multiple Format objects to format more than one number
     * @param s the format string following printf conventions
     * The string has a prefix, a format code and a suffix. The prefix and suffix
     * become part of the formatted output. The format code directs the
     * formatting of the (single) parameter to be formatted. The code has the
     * following structure
     * 
    *
  • a % (required) *
  • a modifier (optional) *
    *
    +
    forces display of + for positive numbers *
    0
    show leading zeroes *
    -
    align left in the field *
    space
    prepend a space in front of positive numbers *
    #
    use "alternate" format. Add 0 or 0x for octal or hexadecimal numbers. Don't suppress trailing zeroes in general floating point format. *
    *
  • an integer denoting field width (optional) *
  • a period followed by an integer denoting precision (optional) *
  • a format descriptor (required) *
    *
    f
    floating point number in fixed format *
    e, E
    floating point number in exponential notation (scientific format). The E format results in an uppercase E for the exponent (1.14130E+003), the e format in a lowercase e. *
    g, G
    floating point number in general format (fixed format for small numbers, exponential format for large numbers). Trailing zeroes are suppressed. The G format results in an uppercase E for the exponent (if any), the g format in a lowercase e. *
    d, i
    integer in decimal *
    x
    integer in hexadecimal *
    o
    integer in octal *
    s
    string *
    c
    character *
    *
* @exception IllegalArgumentException if bad format */ public Format(String s) { width = 0; precision = -1; pre = ""; post = ""; leading_zeroes = false; show_plus = false; alternate = false; show_space = false; left_align = false; fmt = ' '; int state = 0; int length = s.length(); int parse_state = 0; // 0 = prefix, 1 = flags, 2 = width, 3 = precision, // 4 = format, 5 = end int i = 0; while (parse_state == 0) { if (i >= length) { parse_state = 5; } else if (s.charAt(i) == '%') { if (i < length - 1) { if (s.charAt(i + 1) == '%') { pre = pre + '%'; i++; } else { parse_state = 1; } } else { throw new java.lang.IllegalArgumentException(); } } else { pre = pre + s.charAt(i); } i++; } while (parse_state == 1) { if (i >= length) { parse_state = 5; } else if (s.charAt(i) == ' ') { show_space = true; } else if (s.charAt(i) == '-') { left_align = true; } else if (s.charAt(i) == '+') { show_plus = true; } else if (s.charAt(i) == '0') { leading_zeroes = true; } else if (s.charAt(i) == '#') { alternate = true; } else { parse_state = 2; i--; } i++; } while (parse_state == 2) { if (i >= length) { parse_state = 5; } else if ('0' <= s.charAt(i) && s.charAt(i) <= '9') { width = width * 10 + s.charAt(i) - '0'; i++; } else if (s.charAt(i) == '.') { parse_state = 3; precision = 0; i++; } else { parse_state = 4; } } while (parse_state == 3) { if (i >= length) { parse_state = 5; } else if ('0' <= s.charAt(i) && s.charAt(i) <= '9') { precision = precision * 10 + s.charAt(i) - '0'; i++; } else { parse_state = 4; } } if (parse_state == 4) { if (i >= length) { parse_state = 5; } else { fmt = s.charAt(i); } i++; } if (i < length) { post = s.substring(i, length); } } /** * prints a formatted number following printf conventions * @param s a PrintStream * @param fmt the format string * @param x the double to print */ public static void print(java.io.PrintStream s, String fmt, double x) { s.print(new Format(fmt).form(x)); } /** * prints a formatted number following printf conventions * @param s a PrintStream * @param fmt the format string * @param x the long to print */ public static void print(java.io.PrintStream s, String fmt, long x) { s.print(new Format(fmt).form(x)); } /** * prints a formatted number following printf conventions * @param s a PrintStream * @param fmt the format string * @param x the character to */ public static void print(java.io.PrintStream s, String fmt, char x) { s.print(new Format(fmt).form(x)); } /** * prints a formatted number following printf conventions * @param s a PrintStream, fmt the format string * @param x a string that represents the digits to print */ public static void print(java.io.PrintStream s, String fmt, String x) { s.print(new Format(fmt).form(x)); } /** * Converts a string of digits (decimal, octal or hex) to an integer * @param s a string * @return the numeric value of the prefix of s representing a base 10 integer */ public static int atoi(String s) { return (int) atol(s); } /** * Converts a string of digits (decimal, octal or hex) to a long integer * @param s a string * @return the numeric value of the prefix of s representing a base 10 integer */ public static long atol(String s) { int i = 0; while (i < s.length() && Character.isWhitespace(s.charAt(i))) { i++; } if (i < s.length() && s.charAt(i) == '0') { if (i + 1 < s.length() && (s.charAt(i + 1) == 'x' || s.charAt(i + 1) == 'X')) { return parseLong(s.substring(i + 2), 16); } else { return parseLong(s, 8); } } else { return parseLong(s, 10); } } private static long parseLong(String s, int base) { int i = 0; int sign = 1; long r = 0; while (i < s.length() && Character.isWhitespace(s.charAt(i))) { i++; } if (i < s.length() && s.charAt(i) == '-') { sign = -1; i++; } else if (i < s.length() && s.charAt(i) == '+') { i++; } while (i < s.length()) { char ch = s.charAt(i); if ('0' <= ch && ch < '0' + base) { r = r * base + ch - '0'; } else if ('A' <= ch && ch < 'A' + base - 10) { r = r * base + ch - 'A' + 10; } else if ('a' <= ch && ch < 'a' + base - 10) { r = r * base + ch - 'a' + 10; } else { return r * sign; } i++; } return r * sign; } /** * Converts a string of digits to an double * @param s a string */ public static double atof(String s) { int i = 0; int sign = 1; double r = 0; // integer part double f = 0; // fractional part double p = 1; // exponent of fractional part int state = 0; // 0 = int part, 1 = frac part while (i < s.length() && Character.isWhitespace(s.charAt(i))) { i++; } if (i < s.length() && s.charAt(i) == '-') { sign = -1; i++; } else if (i < s.length() && s.charAt(i) == '+') { i++; } while (i < s.length()) { char ch = s.charAt(i); if ('0' <= ch && ch <= '9') { if (state == 0) { r = r * 10 + ch - '0'; } else if (state == 1) { p = p / 10; r = r + p * (ch - '0'); } } else if (ch == '.') { if (state == 0) { state = 1; } else { return sign * r; } } else if (ch == 'e' || ch == 'E') { long e = (int) parseLong(s.substring(i + 1), 10); return sign * r * Math.pow(10, e); } else { return sign * r; } i++; } return sign * r; } /** * Formats a double into a string (like sprintf in C) * @param x the number to format * @return the formatted string * @exception IllegalArgumentException if bad argument */ public String form(double x) { String r; if (precision < 0) { precision = 6; } int s = 1; if (x < 0) { x = -x; s = -1; } if (fmt == 'f') { r = fixed_format(x); } else if (fmt == 'e' || fmt == 'E' || fmt == 'g' || fmt == 'G') { r = exp_format(x); } else { throw new java.lang.IllegalArgumentException(); } return pad(sign(s, r)); } /** * Formats a long integer into a string (like sprintf in C) * @param x the number to format * @return the formatted string */ public String form(long x) { String r; int s = 0; if (fmt == 'd' || fmt == 'i') { s = 1; if (x < 0) { x = -x; s = -1; } r = "" + x; } else if (fmt == 'o') { r = convert(x, 3, 7, "01234567"); } else if (fmt == 'x') { r = convert(x, 4, 15, "0123456789abcdef"); } else if (fmt == 'X') { r = convert(x, 4, 15, "0123456789ABCDEF"); } else { throw new java.lang.IllegalArgumentException(); } return pad(sign(s, r)); } /** * Formats a character into a string (like sprintf in C) * @param x the value to format * @return the formatted string */ public String form(char c) { if (fmt != 'c') { throw new java.lang.IllegalArgumentException(); } String r = "" + c; return pad(r); } /** * Formats a string into a larger string (like sprintf in C) * @param x the value to format * @return the formatted string */ public String form(String s) { if (fmt != 's') { throw new java.lang.IllegalArgumentException(); } if (precision >= 0) { s = s.substring(0, precision); } return pad(s); } /** * a test stub for the format class */ public static void main(String[] a) { double x = 1.23456789012; double y = 123; double z = 1.2345e30; double w = 1.02; double u = 1.234e-5; int d = 0xCAFE; Format.print(System.out, "x = |%f|\n", x); Format.print(System.out, "u = |%20f|\n", u); Format.print(System.out, "x = |% .5f|\n", x); Format.print(System.out, "w = |%20.5f|\n", w); Format.print(System.out, "x = |%020.5f|\n", x); Format.print(System.out, "x = |%+20.5f|\n", x); Format.print(System.out, "x = |%+020.5f|\n", x); Format.print(System.out, "x = |% 020.5f|\n", x); Format.print(System.out, "y = |%#+20.5f|\n", y); Format.print(System.out, "y = |%-+20.5f|\n", y); Format.print(System.out, "z = |%20.5f|\n", z); Format.print(System.out, "x = |%e|\n", x); Format.print(System.out, "u = |%20e|\n", u); Format.print(System.out, "x = |% .5e|\n", x); Format.print(System.out, "w = |%20.5e|\n", w); Format.print(System.out, "x = |%020.5e|\n", x); Format.print(System.out, "x = |%+20.5e|\n", x); Format.print(System.out, "x = |%+020.5e|\n", x); Format.print(System.out, "x = |% 020.5e|\n", x); Format.print(System.out, "y = |%#+20.5e|\n", y); Format.print(System.out, "y = |%-+20.5e|\n", y); Format.print(System.out, "x = |%g|\n", x); Format.print(System.out, "z = |%g|\n", z); Format.print(System.out, "w = |%g|\n", w); Format.print(System.out, "u = |%g|\n", u); Format.print(System.out, "y = |%.2g|\n", y); Format.print(System.out, "y = |%#.2g|\n", y); Format.print(System.out, "d = |%d|\n", d); Format.print(System.out, "d = |%20d|\n", d); Format.print(System.out, "d = |%020d|\n", d); Format.print(System.out, "d = |%+20d|\n", d); Format.print(System.out, "d = |% 020d|\n", d); Format.print(System.out, "d = |%-20d|\n", d); Format.print(System.out, "d = |%20.8d|\n", d); Format.print(System.out, "d = |%x|\n", d); Format.print(System.out, "d = |%20X|\n", d); Format.print(System.out, "d = |%#20x|\n", d); Format.print(System.out, "d = |%020X|\n", d); Format.print(System.out, "d = |%20.8x|\n", d); Format.print(System.out, "d = |%o|\n", d); Format.print(System.out, "d = |%020o|\n", d); Format.print(System.out, "d = |%#20o|\n", d); Format.print(System.out, "d = |%#020o|\n", d); Format.print(System.out, "d = |%20.12o|\n", d); Format.print(System.out, "s = |%-20s|\n", "Hello"); Format.print(System.out, "s = |%-20c|\n", '!'); } private static String repeat(char c, int n) { if (n <= 0) { return ""; } StringBuffer s = new StringBuffer(n); for (int i = 0; i < n; i++) { s.append(c); } return s.toString(); } private static String convert(long x, int n, int m, String d) { if (x == 0) { return "0"; } String r = ""; while (x != 0) { r = d.charAt((int) (x & m)) + r; x = x >>> n; } return r; } private String pad(String r) { String p = repeat(' ', width - r.length()); if (left_align) { return pre + r + p + post; } else { return pre + p + r + post; } } private String sign(int s, String r) { String p = ""; if (s < 0) { p = "-"; } else if (s > 0) { if (show_plus) { p = "+"; } else if (show_space) { p = " "; } } else { if (fmt == 'o' && alternate && r.length() > 0 && r.charAt(0) != '0') { p = "0"; } else if (fmt == 'x' && alternate) { p = "0x"; } else if (fmt == 'X' && alternate) { p = "0X"; } } int w = 0; if (leading_zeroes) { w = width; } else if ((fmt == 'd' || fmt == 'i' || fmt == 'x' || fmt == 'X' || fmt == 'o') && precision > 0) { w = precision; } return p + repeat('0', w - p.length() - r.length()) + r; } private String fixed_format(double d) { String f = ""; if (d > 0x7FFFFFFFFFFFFFFFL) { return exp_format(d); } long l = (long) (precision == 0 ? d + 0.5 : d); f = f + l; double fr = d - l; // fractional part if (fr >= 1 || fr < 0) { return exp_format(d); } return f + frac_part(fr); } private String frac_part(double fr) // precondition: 0 <= fr < 1 { String z = ""; if (precision > 0) { double factor = 1; String leading_zeroes = ""; for (int i = 1; i <= precision && factor <= 0x7FFFFFFFFFFFFFFFL; i++) { factor *= 10; leading_zeroes = leading_zeroes + "0"; } long l = (long) (factor * fr + 0.5); z = leading_zeroes + l; z = z.substring(z.length() - precision, z.length()); } if (precision > 0 || alternate) { z = "." + z; } if ((fmt == 'G' || fmt == 'g') && !alternate) // remove trailing zeroes and decimal point { int t = z.length() - 1; while (t >= 0 && z.charAt(t) == '0') { t--; } if (t >= 0 && z.charAt(t) == '.') { t--; } z = z.substring(0, t + 1); } return z; } private String exp_format(double d) { String f = ""; int e = 0; double dd = d; double factor = 1; if (dd != 0.0) { // DANGER markstro hack for 0.0 while (dd > 10) { e++; factor /= 10; dd = dd / 10; } while (dd < 1) { e--; factor *= 10; dd = dd * 10; } } if ((fmt == 'g' || fmt == 'G') && e >= -4 && e < precision) { return fixed_format(d); } d = d * factor; f = f + fixed_format(d); if (fmt == 'e' || fmt == 'g') { f = f + "e"; } else { f = f + "E"; } String p = "000"; if (e >= 0) { f = f + "+"; p = p + e; } else { f = f + "-"; p = p + (-e); } return f + p.substring(p.length() - 3, p.length()); } private int width; private int precision; private String pre; private String post; private boolean leading_zeroes; private boolean show_plus; private boolean alternate; private boolean show_space; private boolean left_align; private char fmt; // one of cdeEfgGiosxXos }




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