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/*
* 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 1.1.3 Wed Jul 18 15:00:35 GMT 2001
*
*
*
* @author Cay Horstmann
*/
package edu.sc.seis.TauP;
/*
* was package corejava; but changed to the TauP package to avoid namespace
* conflicts. HPC 8/27/98
*
* fixed_format does rounding incorrectly, fixed Oct 27, 1998, HPC
*
*/
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.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 c
* 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 s
* 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);
if(precision > 0) {
d = Math.rint(d * Math.pow(10, precision))
/ Math.pow(10, precision);
}
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
}
