/AmpExt/dev/AmpExt/src/com/bhpb/AmplitudeExtraction/Format.java
Java | 620 lines | 438 code | 53 blank | 129 comment | 229 complexity | 080f145d6fa969a3555a562ca9ef28d3 MD5 | raw file
Possible License(s): BSD-3-Clause, Unlicense
- package com.bhpb.AmplitudeExtraction;
- import java.io.*;
- /**
- A class for formatting numbers that follows <tt>printf</tt> conventions.
- Also implements C-like <tt>atoi</tt> and <tt>atof</tt> functions
- @version 1.21 2000-06-09
- @author Cay Horstmann
- 1998-09-14: Fixed a number of bugs.
- 1.Formatting the most extreme negative number (-9223372036854775808L) printed with 2 leading minus signs.
- 2.Printing 0 with a %e or %g format did not work.
- 3.Printing numbers that were closer to 1 than the number of requested decimal places rounded down rather than up, e.g. formatting 1.999 with %.2f printed 1.00. (This one is pretty serious, of course.)
- 4.Printing with precision 0 (e.g %10.0f) didn't work.
- 5.Printing a string with a precision that exceeded the string length (e.g. print "Hello" with %20.10s) caused a StringIndexOutOfBounds error.
- 1998-10-21: Changed method names from print to printf
- 2000-06-09: Moved to package com.horstmann; no longer part of
- Core Java
- 2000-06-09: Fixed a number of bugs.
- 1.Printing 100.0 with %e printed 10.0e1, not 1.0e2
- 2.Printing Inf and NaN didn't work.
- 2000-06-09: Coding guideline cleanup
- */
- public class Format
- {
- /**
- Formats the number following <tt>printf</tt> 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 = "";
- leadingZeroes = false;
- showPlus = false;
- alternate = false;
- showSpace = false;
- leftAlign = false;
- fmt = ' ';
- int state = 0;
- int length = s.length();
- int parseState = 0;
- // 0 = prefix, 1 = flags, 2 = width, 3 = precision,
- // 4 = format, 5 = end
- int i = 0;
- while (parseState == 0)
- {
- if (i >= length) parseState = 5;
- else if (s.charAt(i) == '%')
- {
- if (i < length - 1)
- {
- if (s.charAt(i + 1) == '%')
- {
- pre = pre + '%';
- i++;
- }
- else
- parseState = 1;
- }
- else throw new java.lang.IllegalArgumentException();
- }
- else
- pre = pre + s.charAt(i);
- i++;
- }
- while (parseState == 1)
- {
- if (i >= length) parseState = 5;
- else if (s.charAt(i) == ' ') showSpace = true;
- else if (s.charAt(i) == '-') leftAlign = true;
- else if (s.charAt(i) == '+') showPlus = true;
- else if (s.charAt(i) == '0') leadingZeroes = true;
- else if (s.charAt(i) == '#') alternate = true;
- else { parseState = 2; i--; }
- i++;
- }
- while (parseState == 2)
- {
- if (i >= length) parseState = 5;
- else if ('0' <= s.charAt(i) && s.charAt(i) <= '9')
- {
- width = width * 10 + s.charAt(i) - '0';
- i++;
- }
- else if (s.charAt(i) == '.')
- {
- parseState = 3;
- precision = 0;
- i++;
- }
- else
- parseState = 4;
- }
- while (parseState == 3)
- {
- if (i >= length) parseState = 5;
- else if ('0' <= s.charAt(i) && s.charAt(i) <= '9')
- {
- precision = precision * 10 + s.charAt(i) - '0';
- i++;
- }
- else
- parseState = 4;
- }
- if (parseState == 4)
- {
- if (i >= length) parseState = 5;
- else fmt = s.charAt(i);
- i++;
- }
- if (i < length)
- post = s.substring(i, length);
- }
- /**
- prints a formatted number following printf conventions
- @param fmt the format string
- @param x the double to print
- */
- public static void printf(String fmt, double x)
- {
- System.out.print(new Format(fmt).format(x));
- }
- /**
- prints a formatted number following printf conventions
- @param fmt the format string
- @param x the int to print
- */
- public static void printf(String fmt, int x)
- {
- System.out.print(new Format(fmt).format(x));
- }
- /**
- prints a formatted number following printf conventions
- @param fmt the format string
- @param x the long to print
- */
- public static void printf(String fmt, long x)
- {
- System.out.print(new Format(fmt).format(x));
- }
- /**
- prints a formatted number following printf conventions
- @param fmt the format string
- @param x the character to print
- */
- public static void printf(String fmt, char x)
- {
- System.out.print(new Format(fmt).format(x));
- }
- /**
- prints a formatted number following printf conventions
- @param fmt the format string
- @param x a string to print
- */
- public static void printf(String fmt, String x)
- {
- System.out.print(new Format(fmt).format(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 a <tt>double</tt>
- @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 <tt>double</tt> into a string (like sprintf in C)
- @param x the number to format
- @return the formatted string
- @exception IllegalArgumentException if bad argument
- */
- public String format(double x)
- {
- String r;
- if (precision < 0) precision = 6;
- int s = 1;
- if (x < 0) { x = -x; s = -1; }
- if (Double.isNaN(x)) r = "NaN";
- else if (x == Double.POSITIVE_INFINITY) r = "Inf";
- else if (fmt == 'f')
- r = fixedFormat(x);
- else if (fmt == 'e' || fmt == 'E' || fmt == 'g' || fmt == 'G')
- r = expFormat(x);
- else throw new java.lang.IllegalArgumentException();
- return pad(sign(s, r));
- }
- /**
- Formats an integer into a string (like sprintf in C)
- @param x the number to format
- @return the formatted string
- */
- public String format(int x)
- {
- long lx = x;
- if (fmt == 'o' || fmt == 'x' || fmt == 'X')
- lx &= 0xFFFFFFFFL;
- return format(lx);
- }
- /**
- Formats a long integer into a string (like sprintf in C)
- @param x the number to format
- @return the formatted string
- */
- public String format(long x)
- {
- String r;
- int s = 0;
- if (fmt == 'd' || fmt == 'i')
- {
- if (x < 0)
- {
- r = ("" + x).substring(1);
- s = -1;
- }
- else
- {
- r = "" + x;
- s = 1;
- }
- }
- 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 format(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 format(String s)
- {
- if (fmt != 's')
- throw new java.lang.IllegalArgumentException();
- if (precision >= 0 && precision < s.length())
- 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.printf("x = |%f|\n", x);
- Format.printf("u = |%20f|\n", u);
- Format.printf("x = |% .5f|\n", x);
- Format.printf("w = |%20.5f|\n", w);
- Format.printf("x = |%020.5f|\n", x);
- Format.printf("x = |%+20.5f|\n", x);
- Format.printf("x = |%+020.5f|\n", x);
- Format.printf("x = |% 020.5f|\n", x);
- Format.printf("y = |%#+20.5f|\n", y);
- Format.printf("y = |%-+20.5f|\n", y);
- Format.printf("z = |%20.5f|\n", z);
- Format.printf("x = |%e|\n", x);
- Format.printf("u = |%20e|\n", u);
- Format.printf("x = |% .5e|\n", x);
- Format.printf("w = |%20.5e|\n", w);
- Format.printf("x = |%020.5e|\n", x);
- Format.printf("x = |%+20.5e|\n", x);
- Format.printf("x = |%+020.5e|\n", x);
- Format.printf("x = |% 020.5e|\n", x);
- Format.printf("y = |%#+20.5e|\n", y);
- Format.printf("y = |%-+20.5e|\n", y);
- Format.printf("x = |%g|\n", x);
- Format.printf("z = |%g|\n", z);
- Format.printf("w = |%g|\n", w);
- Format.printf("u = |%g|\n", u);
- Format.printf("y = |%.2g|\n", y);
- Format.printf("y = |%#.2g|\n", y);
- Format.printf("d = |%d|\n", d);
- Format.printf("d = |%20d|\n", d);
- Format.printf("d = |%020d|\n", d);
- Format.printf("d = |%+20d|\n", d);
- Format.printf("d = |% 020d|\n", d);
- Format.printf("d = |%-20d|\n", d);
- Format.printf("d = |%20.8d|\n", d);
- Format.printf("d = |%x|\n", d);
- Format.printf("d = |%20X|\n", d);
- Format.printf("d = |%#20x|\n", d);
- Format.printf("d = |%020X|\n", d);
- Format.printf("d = |%20.8x|\n", d);
- Format.printf("d = |%o|\n", d);
- Format.printf("d = |%020o|\n", d);
- Format.printf("d = |%#20o|\n", d);
- Format.printf("d = |%#020o|\n", d);
- Format.printf("d = |%20.12o|\n", d);
- Format.printf("s = |%-20s|\n", "Hello");
- Format.printf("s = |%-20c|\n", '!');
- // regression test to confirm fix of reported bugs
- Format.printf("|%i|\n", Long.MIN_VALUE);
- Format.printf("|%6.2e|\n", 0.0);
- Format.printf("|%6.2g|\n", 0.0);
- Format.printf("|%6.2f|\n", 9.99);
- Format.printf("|%6.2f|\n", 9.999);
- Format.printf("|%.2f|\n", 1.999);
- Format.printf("|%6.0f|\n", 9.999);
- Format.printf("|%20.10s|\n", "Hello");
- d = -1;
- Format.printf("-1 = |%X|\n", d);
- Format.printf("100 = |%e|\n", 100.0); // 2000-06-09
- Format.printf("1/0 = |%f|\n", 1.0 / 0.0);
- Format.printf("-1/0 = |%e|\n", -1.0 / 0.0);
- Format.printf("0/0 = |%g|\n", 0.0 / 0.0);
- }
- 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 (leftAlign) 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 (showPlus) p = "+";
- else if (showSpace) 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 (leadingZeroes)
- 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 fixedFormat(double d)
- {
- boolean removeTrailing
- = (fmt == 'G' || fmt == 'g') && !alternate;
- // remove trailing zeroes and decimal point
- if (d > 0x7FFFFFFFFFFFFFFFL) return expFormat(d);
- if (precision == 0)
- return (long)(d + 0.5) + (removeTrailing ? "" : ".");
- long whole = (long)d;
- double fr = d - whole; // fractional part
- if (fr >= 1 || fr < 0) return expFormat(d);
- double factor = 1;
- StringBuffer leadingZeroes = new StringBuffer();
- for (int i = 1; i <= precision && factor <= 0x7FFFFFFFFFFFFFFFL; i++)
- {
- factor *= 10;
- leadingZeroes.append("0");
- }
- long l = (long) (factor * fr + 0.5);
- if (l >= factor) { l = 0; whole++; } // CSH 10-25-97
- String z = leadingZeroes.toString() + l;
- z = "." + z.substring(z.length() - precision, z.length());
- if (removeTrailing)
- {
- 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 whole + z;
- }
- private String expFormat(double d)
- {
- String f = "";
- int e = 0;
- double dd = d;
- double factor = 1;
- if (d != 0)
- {
- while (dd >= 10) { e++; factor /= 10; dd = dd / 10; } // 2000-06-09
- while (dd < 1) { e--; factor *= 10; dd = dd * 10; }
- }
- if ((fmt == 'g' || fmt == 'G') && e >= -4 && e < precision)
- return fixedFormat(d);
- d = d * factor;
- f = f + fixedFormat(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 leadingZeroes;
- private boolean showPlus;
- private boolean alternate;
- private boolean showSpace;
- private boolean leftAlign;
- private char fmt; // one of cdeEfgGiosxXos
- }