Class silk.SchemeUtils
java.lang.Object
|
+----silk.SchemeUtils
- Subclasses:
- Environment, InputPort, Pair, Procedure, Scheme
- public abstract class SchemeUtils
- extends java.lang.Object
Field Summary
static java.lang.Boolean
FALSE
Same as Boolean.FALSE.
static java.lang.Double
ONE
static java.lang.Boolean
TRUE
Same as Boolean.TRUE.
static java.lang.Double
ZERO
Constructor Summary
Method Summary
static char
chr (java.lang.Object x)
Converts a Scheme object to a char, or calls error.
static java.lang.Character
chr (char ch)
Converts a char to a Character.
static
Pair
cons (java.lang.Object a,
java.lang.Object b)
cons(x, y) is the same as new Pair(x, y).
static boolean
equal (java.lang.Object x,
java.lang.Object y)
Check if two objects are equal.
static boolean
eqv (java.lang.Object x,
java.lang.Object y)
Check if two objects are == or are equal numbers or characters.
static java.lang.Object
error (java.lang.String message)
A continuable error.
static java.lang.Object
first (java.lang.Object x)
Like Common Lisp first; car of a Pair, or null for anything else.
static
InputPort
inPort (java.lang.Object x,
Scheme interp)
Coerces a Scheme object to a Scheme input port, which is an InputPort.
static int
length (java.lang.Object x)
The length of a list, or zero for a non-list.
static
Pair
list (java.lang.Object a,
java.lang.Object b)
Creates a two element list.
static
Pair
list (java.lang.Object a)
Creates a one element list.
static java.lang.Object
listStar (java.lang.Object args)
listStar(args) is like Common Lisp (apply #'list* args)
static char[]
listToString (java.lang.Object chars)
Convert a list of characters to a Scheme string, which is a char[].
static java.lang.Object[]
listToVector (java.lang.Object objs)
Convert a list of Objects to a Scheme vector, which is a Object[].
static java.lang.Double
num (double x)
Convert double to Double.
static double
num (java.lang.Object x)
Converts a Scheme object to a double, or calls error.
static java.io.PrintWriter
outPort (java.lang.Object x,
Scheme interp)
Coerces a Scheme object to a Scheme input port, which is a PrintWriter.
static java.lang.Object
rest (java.lang.Object x)
Like Common Lisp rest; car of a Pair, or null for anything else.
static java.lang.Object
reverse (java.lang.Object x)
Reverse the elements of a list.
static java.lang.Object
second (java.lang.Object x)
Like Common Lisp second.
static java.lang.Object
setFirst (java.lang.Object x,
java.lang.Object y)
Like Common Lisp (setf (first ...
static java.lang.Object
setRest (java.lang.Object x,
java.lang.Object y)
Like Common Lisp (setf (rest ...
static char[]
str (java.lang.Object x)
Coerces a Scheme object to a Scheme string, which is a char[].
static java.lang.String
sym (java.lang.Object x)
Coerces a Scheme object to a Scheme symbol, which is a string.
static java.lang.Object
third (java.lang.Object x)
Like Common Lisp third.
static java.lang.Boolean
truth (boolean x)
Convert boolean to Boolean.
static boolean
truth (java.lang.Object x)
Convert Scheme object to boolean.
static java.lang.Object[]
vec (java.lang.Object x)
Coerces a Scheme object to a Scheme vector, which is a Object[].
static java.lang.Object
warn (java.lang.String message)
static java.lang.Object
write (java.lang.Object x,
java.io.PrintWriter port,
boolean quoted)
Write the object to a port.
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
Field Detail
TRUE
public static final java.lang.Boolean TRUE
- Same as Boolean.TRUE.
FALSE
public static final java.lang.Boolean FALSE
- Same as Boolean.FALSE.
ZERO
public static java.lang.Double ZERO
ONE
public static java.lang.Double ONE
Constructor Detail
SchemeUtils
public SchemeUtils()
Method Detail
truth
public static java.lang.Boolean truth(boolean x)
- Convert boolean to Boolean.
truth
public static boolean truth(java.lang.Object x)
- Convert Scheme object to boolean. Only #f is false, others are true.
num
public static java.lang.Double num(double x)
- Convert double to Double. Caches 0 and 1; makes new for others.
num
public static double num(java.lang.Object x)
- Converts a Scheme object to a double, or calls error.
chr
public static char chr(java.lang.Object x)
- Converts a Scheme object to a char, or calls error.
chr
public static java.lang.Character chr(char ch)
- Converts a char to a Character.
str
public static char[] str(java.lang.Object x)
- Coerces a Scheme object to a Scheme string, which is a char[].
sym
public static java.lang.String sym(java.lang.Object x)
- Coerces a Scheme object to a Scheme symbol, which is a string.
vec
public static java.lang.Object[] vec(java.lang.Object x)
- Coerces a Scheme object to a Scheme vector, which is a Object[].
inPort
public static InputPort inPort(java.lang.Object x,
Scheme interp)
- Coerces a Scheme object to a Scheme input port, which is an InputPort.
If the argument is null, returns interpreter.input.
outPort
public static java.io.PrintWriter outPort(java.lang.Object x,
Scheme interp)
- Coerces a Scheme object to a Scheme input port, which is a PrintWriter.
If the argument is null, returns System.out.
error
public static java.lang.Object error(java.lang.String message)
- A continuable error. Prints an error message and then prompts for
a value to eval and return.
warn
public static java.lang.Object warn(java.lang.String message)
first
public static java.lang.Object first(java.lang.Object x)
- Like Common Lisp first; car of a Pair, or null for anything else.
rest
public static java.lang.Object rest(java.lang.Object x)
- Like Common Lisp rest; car of a Pair, or null for anything else.
setFirst
public static java.lang.Object setFirst(java.lang.Object x,
java.lang.Object y)
- Like Common Lisp (setf (first ...
setRest
public static java.lang.Object setRest(java.lang.Object x,
java.lang.Object y)
- Like Common Lisp (setf (rest ...
second
public static java.lang.Object second(java.lang.Object x)
- Like Common Lisp second.
third
public static java.lang.Object third(java.lang.Object x)
- Like Common Lisp third.
list
public static Pair list(java.lang.Object a,
java.lang.Object b)
- Creates a two element list.
list
public static Pair list(java.lang.Object a)
- Creates a one element list.
listStar
public static java.lang.Object listStar(java.lang.Object args)
- listStar(args) is like Common Lisp (apply #'list* args)
cons
public static Pair cons(java.lang.Object a,
java.lang.Object b)
- cons(x, y) is the same as new Pair(x, y).
reverse
public static java.lang.Object reverse(java.lang.Object x)
- Reverse the elements of a list.
equal
public static boolean equal(java.lang.Object x,
java.lang.Object y)
- Check if two objects are equal.
eqv
public static boolean eqv(java.lang.Object x,
java.lang.Object y)
- Check if two objects are == or are equal numbers or characters.
length
public static int length(java.lang.Object x)
- The length of a list, or zero for a non-list.
listToString
public static char[] listToString(java.lang.Object chars)
- Convert a list of characters to a Scheme string, which is a char[].
listToVector
public static java.lang.Object[] listToVector(java.lang.Object objs)
- Convert a list of Objects to a Scheme vector, which is a Object[].
write
public static java.lang.Object write(java.lang.Object x,
java.io.PrintWriter port,
boolean quoted)
- Write the object to a port. If quoted is true, use "str" and #\c,
otherwise use str and c.
vectorToList
public static Pair vectorToList(java.lang.Object x)
- Convert a vector to a List.