--- /dev/null
+/*
+ * Gary Cornell and Cay S. Horstmann, Core Java (Book/CD-ROM)
+ * Published By SunSoft Press/Prentice-Hall
+ * Copyright (C) 1996 Sun Microsystems Inc.
+ * All Rights Reserved. ISBN 0-13-565755-5
+ *
+ * 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
+ */
+
+
+
+import java.io.*;
+
+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
+ * <ul>
+ * <li> a % (required)
+ * <li> a modifier (optional)
+ * <dl>
+ * <dt> + <dd> forces display of + for positive numbers
+ * <dt> 0 <dd> show leading zeroes
+ * <dt> - <dd> align left in the field
+ * <dt> space <dd> prepend a space in front of positive numbers
+ * <dt> # <dd> use "alternate" format. Add 0 or 0x for octal or hexadecimal numbers. Don't suppress trailing zeroes in general floating point format.
+ * </dl>
+ * <li> an integer denoting field width (optional)
+ * <li> a period followed by an integer denoting precision (optional)
+ * <li> a format descriptor (required)
+ * <dl>
+ * <dt>f <dd> floating point number in fixed format
+ * <dt>e, E <dd> 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.
+ * <dt>g, G <dd> 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.
+ * <dt>d, i <dd> integer in decimal
+ * <dt>x <dd> integer in hexadecimal
+ * <dt>o <dd> integer in octal
+ * <dt>s <dd> string
+ * <dt>c <dd> character
+ * </dl>
+ * </ul>
+ * @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.isSpace(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.isSpace(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.isSpace(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;
+ 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
+}
projects / spider.git / blobdiff