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|
<html><head>
<title>Predicates</title>
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<body>
<a href="../start.htm">Nyquist / XLISP 2.0</a> -
<a href="../manual/contents.htm">Contents</a> |
<a href="../tutorials/tutorials.htm">Tutorials</a> |
<a href="examples.htm">Examples</a> |
<a href="../reference/reference-index.htm">Reference</a>
<hr>
<h1>Predicates and Comparison</h1>
<hr>
<p>Lisp has extensive support for <nobr>run-time</nobr> tests.</p>
<p><nobr><b>Generalized Lisp Functions</b> - slower than the build-ins, but no errors</nobr></p>
<ol>
<li><nobr><a href="#built-in-xlisp-functions">Built-in XLISP Functions</a></nobr></li>
<li><nobr>Generalized Comparison - one or more arguments</nobr></li>
<ul>
<li><nobr><a href="#equalp">equalp</a> - compares expressions with 'equality' functions.</nobr></li>
</ul>
<li><nobr>Symbol Predicates - one argument</nobr></li>
<ul>
<li><nobr><a href="#variablep">variablep</a> - is this a symbol with a variable value bound to it?</nobr></li>
<li><nobr><a href="#functionp">functionp</a> - is this a function or a symbol with a function value bound to it?</nobr></li>
<li><nobr><a href="#specialp">specialp</a> - is this a special form or a symbol with a special form bound to it?</nobr></li>
<li><nobr><a href="#subrp">macrop</a> - is this a Lisp macro or a symbol with a Lisp macro bound to it?</nobr></li>
</ul>
<li><nobr>Function Predicates - one argument</nobr></li>
<ul>
<li><nobr><a href="#subrp">subrp</a> - is this a build-in function?</nobr></li>
<li><nobr><a href="#fsubrp">fsubrp</a> - is this a build-in special form?</nobr></li>
<li><nobr><a href="#closurep">closurep</a> - is this a user-defined function?</nobr></li>
</ul>
<li><nobr>Character Predicates - one argument</nobr></li>
<ul>
<li><nobr><a href="strings.htm#posix">POSIX Character Classes</a></nobr></li>
</ul>
</ol>
<p><nobr> <a href="#top">Back to top</a></nobr></p>
<a name="built-in-xlisp-functions"></a>
<hr>
<h2>Built-in XLISP Functions</h2>
<hr>
<ol>
<li><nobr><b>Boolean Predicates</b> - one argument [all types]</nobr></li>
<ul>
<li><nobr><a href="../reference/not.htm">not</a> - does this expression evaluate to false?</nobr></li>
</ul>
<li><nobr><b>Generalized Comparison</b> - two arguments [all types]</nobr></li>
<ul>
<li><nobr><a href="../reference/eq.htm">eq</a> - are the expressions identical?</nobr></li>
<li><nobr><a href="../reference/eql.htm">eql</a> - are the expressions identical or equal numbers?</nobr></li>
<li><nobr><a href="../reference/equal.htm">equal</a> - do the <a href="../reference/print.htm">print</a>ed expressions look the same?</nobr></li>
</ul>
<li><nobr><b>Type Predicates</b> - one argument [all types]</nobr></li>
<ul>
<li><nobr><a href="../reference/atom.htm">atom</a> - is this an atom?</nobr></li>
<li><nobr><a href="../reference/symbolp.htm">symbolp</a> - is this a symbol?</nobr></li>
<ul>
<li><nobr><b>Symbol Predicates</b> - one argument [error if not a symbol]</nobr></li>
<ul>
<li><nobr><a href="../reference/boundp.htm">boundp</a> - has the symbol a variable value?</nobr></li>
<li><nobr><a href="../reference/fboundp.htm">fboundp</a> - has the symbol a function value?</nobr></li>
</ul>
</ul>
<li><nobr><a href="../reference/numberp.htm">numberp</a> - is this a number?</nobr></li>
<ul>
<li><nobr><b>Number Predicates</b> - one argument [error if not a number]</nobr></li>
<ul>
<li><nobr><a href="../reference/plusp.htm">plusp</a> - is the number positive?</nobr></li>
<li><nobr><a href="../reference/minusp.htm">minusp</a> - is the number negative?</nobr></li>
<li><nobr><a href="../reference/zerop.htm">zerop</a> - is the number equal to zero?</nobr></li>
<li><nobr><a href="../reference/integerp.htm">integerp</a> - is the number an integer?</nobr></li>
<ul>
<li><nobr><b>Integer Predicates</b> - one argument [error if not an integer]</nobr></li>
<ul>
<li><nobr><a href="../reference/evenp.htm">evenp</a> - is the integer even?</nobr></li>
<li><nobr><a href="../reference/oddp.htm">oddp</a> - is the integer odd?</nobr></li>
</ul>
</ul>
<li><nobr><a href="../reference/floatp.htm">floatp</a> - is the number a floating-point number?</nobr></li>
</ul>
<li><nobr><b>Numerical Comparison</b> - one or more arguments [error if not numbers only]</nobr></li>
<ul>
<li><nobr><a href="../reference/number-lessp.htm"> < </a> - true if all numbers are monotonically increasing</nobr></li>
<li><nobr><a href="../reference/number-not-greaterp.htm"> <= </a> - true if all numbers are monotonically nondecreasing</nobr></li>
<li><nobr><a href="../reference/number-equal.htm"> = </a> - true if all all numbers are the same value</nobr></li>
<li><nobr><a href="../reference/number-not-equal.htm"> /= </a> - true if no two numbers have the same value</nobr></li>
<li><nobr><a href="../reference/number-not-lessp.htm"> >= </a> - true if all numbers are monotonically nonincreasing</nobr></li>
<li><nobr><a href="../reference/number-greaterp.htm"> > </a> - true if all numbers are monotonically decreasing</nobr></li>
</ul>
</ul>
<li><nobr><a href="../reference/null.htm">null</a> - is this an empty list?</nobr></li>
<li><nobr><a href="../reference/consp.htm">consp</a> - is it a non-empty list?</nobr></li>
<li><nobr><a href="../reference/listp.htm">listp</a> - is this a list?</nobr></li>
<ul>
<li><nobr><b>List Predicates</b> - one argument [error if not a list]</nobr></li>
<ul>
<li><nobr><a href="../reference/endp.htm">endp</a> - is this the end of a list?</nobr></li>
</ul>
</ul>
<li><nobr><a href="../reference/stringp.htm">stringp</a> - is this a string?</nobr></li>
<ul>
<li><nobr><b>String Comparison</b> - one or more arguments [error if not strings only]</nobr></li>
<ul>
<li><nobr>Case Sensitive</nobr></li>
<ul>
<li><nobr><a href="../reference/string-lessp-s.htm">string<</a> - test for less than in ASCII ordering</nobr></li>
<li><nobr><a href="../reference/string-not-greaterp-s.htm">string<=</a> - test for less than or equal to in ASCII ordering</nobr></li>
<li><nobr><a href="../reference/string-equal-s.htm">string=</a> - test for equal to in ASCII ordering</nobr></li>
<li><nobr><a href="../reference/string-not-equal-s.htm">string/=</a> - test for not equal to in ASCII ordering</nobr></li>
<li><nobr><a href="../reference/string-not-lessp-s.htm">string>=</a> - test for greater than or equal to in ASCII ordering</nobr></li>
<li><nobr><a href="../reference/string-greaterp-s.htm">string></a> - test for greater than in ASCII ordering</nobr></li>
</ul>
<li><nobr>Case Insensitive</nobr></li>
<ul>
<li><nobr><a href="../reference/string-lessp-i.htm">string-lessp</a> - is this less than in ASCII ordering ?</nobr></li>
<li><nobr><a href="../reference/string-not-greaterp-i.htm">string-not-greaterp</a> - is this not greater than in ASCII ordering ?</nobr></li>
<li><nobr><a href="../reference/string-equal-i.htm">string-equal</a> - is this equal in ASCII ordering ?</nobr></li>
<li><nobr><a href="../reference/string-not-equal-i.htm">string-not-equal</a> - is this not equal in ASCII ordering ?</nobr></li>
<li><nobr><a href="../reference/string-not-lessp-i.htm">string-not-lessp</a> - is this not less than in ASCII ordering ?</nobr></li>
<li><nobr><a href="../reference/string-greaterp-i.htm">string-greaterp</a> - is this greater than in ASCII ordering ?</nobr></li>
</ul>
<li><nobr>See also <a href="strings.htm#unicode">Unicode</a> examples.</nobr></li>
</ul>
</ul>
<li><nobr><a href="../reference/characterp.htm">characterp</a> - is this a character?</nobr></li>
<ul>
<li><nobr><b>Character Predicates</b> - one argument [error if not a character]</nobr></li>
<ul>
<li><nobr><a href="../reference/upper-case-p.htm">upper-case-p</a> - is this an upper case character?</nobr></li>
<li><nobr><a href="../reference/lower-case-p.htm">lower-case-p</a> - is this a lower case character?</nobr></li>
<li><nobr><a href="../reference/both-case-p.htm">both-case-p</a> - is this an alphabetic [either case] character?</nobr></li>
<li><nobr><a href="../reference/digit-char-p.htm">digit-char-p</a> - is this a digit character?</nobr></li>
<li><nobr><a href="../reference/alphanumericp.htm">alphanumericp</a> - is this an alphabetic or a digit character?</nobr></li>
<li><nobr>See also <a href="strings.htm#posix">POSIX Character Classes</a>.</nobr></li>
</ul>
<li><nobr><b>Character Comparison</b> - one or more arguments [error if not characters only]</nobr></li>
<ul>
<li><nobr>Case Sensitive</nobr></li>
<ul>
<li><nobr><a href="../reference/char-lessp-s.htm">char<</a> - test for less than in ASCII ordering</nobr></li>
<li><nobr><a href="../reference/char-not-greaterp-s.htm">char<=</a> - test for less than or equal to in ASCII ordering</nobr></li>
<li><nobr><a href="../reference/char-equal-s.htm">char=</a> - test for equal to in ASCII ordering</nobr></li>
<li><nobr><a href="../reference/char-not-equal-s.htm">char/=</a> - test for not equal to in ASCII ordering</nobr></li>
<li><nobr><a href="../reference/char-not-lessp-s.htm">char>=</a> - test for greater than or equal to in ASCII ordering</nobr></li>
<li><nobr><a href="../reference/char-greaterp-s.htm">char></a> - test for greater than in ASCII ordering</nobr></li>
</ul>
<li><nobr>Case Insensitive</nobr></li>
<ul>
<li><nobr><a href="../reference/char-lessp-i.htm">char-lessp</a> - is this less than in ASCII ordering?</nobr></li>
<li><nobr><a href="../reference/char-not-greaterp-i.htm">char-not-greaterp</a> - is this not greater than in ASCII ordering ?</nobr></li>
<li><nobr><a href="../reference/char-equal-i.htm">char-equal</a> - is this equal in ASCII ordering?</nobr></li>
<li><nobr><a href="../reference/char-not-equal-i.htm">char-not-equal</a> - is this not equal in ASCII ordering?</nobr></li>
<li><nobr><a href="../reference/char-not-lessp-i.htm">char-not-lessp</a> - is this not less than in ASCII ordering ?</nobr></li>
<li><nobr><a href="../reference/char-greaterp-i.htm">char-greaterp</a> - is this greater than in ASCII ordering?</nobr></li>
</ul>
<li><nobr>See also <a href="strings.htm#unicode">Unicode</a> examples.</nobr></li>
</ul>
</ul>
<li><nobr><a href="../reference/arrayp.htm">arrayp</a> - is this an array?</nobr></li>
<li><nobr><a href="../reference/streamp.htm">streamp</a> - is this a stream?</nobr></li>
<li><nobr><a href="../reference/objectp.htm">objectp</a> - is this an object?</nobr></li>
<li><nobr>filep - is this a file?</nobr></li>
<li><nobr>soundp - is this a sound?</nobr></li>
</ul>
</ol>
<p><nobr> <a href="#top">Back to top</a></nobr></p>
<a name="equalp"></a>
<hr>
<h2>equalp</h2>
<hr>
<p>Two expressions are 'equalp':</p>
<ul>
<li><p>If two numbers <nobr>are
<a href="../reference/number-equal.htm"> = </a></nobr>
numerical equal.</p></li>
<li><p>If two characters are
<nobr><a href="../reference/char-equal.htm">char-equal</a></nobr>.</p></li>
<li><p>If two strings are <nobr><a
href="../reference/string-equal.htm">string-equal</a></nobr>.</p></li>
<li><p>If the two <a href="../reference/car.htm">car</a>s in conses are
'equalp' and the two <a href="../reference/cdr.htm">cdr</a>s in conses
are 'equalp'.</p></li>
<li><p>If two arrays have the same number of elements and dimensions, and
the corresponding elements in all dimensions are 'equalp'.</p></li>
</ul>
<pre class="example">
(defun <font color="#0000CC">equalp</font> (expr-1 expr-2)
(or (equal expr-1 expr-2)
(and (numberp expr-1) (numberp expr-2) (= expr-1 expr-2))
(let ((type (type-of expr-1)))
(when (eq type (type-of expr-2))
(case type
(character (char-equal expr-1 expr-2))
(string (string-equal expr-1 expr-2))
(cons (do ((x (first expr-1)
(if (consp expr-1) (first expr-1) expr-1))
(y (first expr-2)
(if (consp expr-2) (first expr-2) expr-2)))
((or (null expr-1)
(null expr-2)
(not (equalp x y)))
(and (null expr-1)
(null expr-2)))
(setq expr-1 (and (consp expr-1) (rest expr-1))
expr-2 (and (consp expr-2) (rest expr-2)))))
(array (let ((end (length expr-1)))
(when (eql end (length expr-2))
(dotimes (index end t)
(and (not (equalp (aref expr-1 index)
(aref expr-2 index)))
(return nil)))))))))))
</pre>
<p><b>cons:</b> I used <a href="../reference/do.htm">do</a> instead of
recursion because XLISP has only two kilobytes stack size. <nobr>The
(<a href="../reference/consp.htm">consp</a> <i>expr</i>)</nobr> tests are
necessary because in a dotted list the last
<a href="../reference/rest.htm">rest</a> element is not a cons.</p>
<p>Examples:</p>
<pre class="example">
(equalp 1 1.0) => T
(equalp #\a #\A) => T
(equalp "Abc" "aBc") => T
(equalp '(1 #\a "Abc") '(1.0 #\A "aBc")) => T
(equalp #(1 #\a "Abc") #(1.0 #\A "aBc")) => T
</pre>
<p>Nested expressions only match if the nesting matches:</p>
<pre class="example">
(equalp '(1 <font color="#AA0000">(</font>2 3<font color="#AA0000">)</font>) '(1.0 <font color="#AA0000">(</font>2.0 3.0<font color="#AA0000">)</font>) => T
(equalp '(1 <font color="#AA0000">(</font>2 3<font color="#AA0000">)</font>) '(<font color="#AA0000">(</font>1.0 2.0<font color="#AA0000">)</font> 3.0) => NIL
(equalp '(<font color="#AA0000">(</font>1 2<font color="#AA0000">)</font> 3) '(<font color="#AA0000">(</font>1.0 2.0<font color="#AA0000">)</font> 3.0) => T
(equalp '(<font color="#AA0000">(</font>1 2<font color="#AA0000">)</font> 3) '(1.0 <font color="#AA0000">(</font>2.0 3.0<font color="#AA0000">)</font>) => NIL
</pre>
<p>A character does not match a string with the same character:</p>
<pre class="example">
(equalp #\a "a") => NIL
</pre>
<p><nobr> <a href="#top">Back to top</a></nobr></p>
<a name="variablep"></a>
<hr>
<h2>variablep</h2>
<hr>
<p>The 'variablep' macro tests if a Lisp expression evaluates to a symbol
with a valid variable value bound to it in the current global or lexical
environment:</p>
<pre class="example">
(defmacro <font color="#0000CC">variablep</font> (expr)
`(and (symbolp ,expr)
(valuep ,expr)))
</pre>
<p>Depends on <a href="environment.htm#valuep">valuep</a>, see
<a href="../reference/and.htm">and</a>,
<a href="../reference/defmacro.htm">defmacro</a>,
<a href="../reference/symbolp.htm">symbolp</a>.</p>
<p><nobr> <a href="#top">Back to top</a></nobr></p>
<a name="functionp"></a>
<hr>
<h2>functionp</h2>
<hr>
<p>The 'functionp' macro tests if a Lisp expression eveluates to a function
or a symbol with a valid function value bound to it in the current global or
lexical environment:</p>
<pre class="example">
(defmacro <font color="#0000CC">functionp</font> (expr)
`(case (type-of ,expr)
(closure (eq 'lambda (car (get-lambda-expression ,expr))))
(subr t)
(symbol (and (or (lfboundp ,expr) (fboundp ,expr))
(functionp (function ,(if (consp expr) (cadr expr) expr)))))
(t nil)))
</pre>
<p>Depends on <a href="environment.htm#lfboundp">lfboundp</a>, see
<a href="../reference/and.htm">and</a>,
<a href="../reference/caar.htm">cadr</a>,
<a href="../reference/car.htm">car</a>,
<a href="../reference/case.htm">case</a>,
<a href="../manual/xlisp.htm#data-types">closure</a>,
<a href="../reference/defmacro.htm">defmacro</a>,
<a href="../reference/eq.htm">eq</a>,
<a href="../reference/fboundp.htm">fboundp</a>,
<a href="../reference/function.htm">function</a>,
<nobr><a href="../reference/get-lambda-expression.htm">get-lambda-expression</a></nobr>,
<a href="../reference/lambda.htm">lambda</a>,
<a href="../reference/nil.htm">nil</a>,
<a href="../reference/or.htm">or</a>,
<a href="../manual/xlisp.htm#data-types">subr</a>,
<a href="../manual/xlisp.htm#data-types">symbol</a>,
<nobr><a href="../reference/t.htm"> t </a></nobr>,
<nobr><a href="../reference/type-of.htm">type-of</a></nobr>.</p>
<p>The awkward <nobr>(function ,(if (consp expr) (cadr expr) expr))</nobr>
construct is necessary because the
<a href="../reference/function.htm">function</a> special form needs a
<nobr>pre-evaluated</nobr> argument, what must be
done at <nobr>macro-expansion</nobr> time, so an additional
<nobr><a href="../reference/consp.htm">consp</a></nobr> test is
needed if the 'expr' argument is a list at all, otherwise
<a href="../reference/cadr.htm">cadr</a> will produce an error.</p>
Examples:
<pre class="example">
(functionp #'car) => T <font color="#008844">; subr = built-in function</font>
(functionp 'car) => T <font color="#008844">; symbol with a function value</font>
(functionp #'and) => NIL <font color="#008844">; fsubr = built-in special form</font>
(functionp "and") => NIL <font color="#008844">; string</font>
(defun a () nil) => A <font color="#008844">; closure = user-defined function</font>
(functionp #'a) => T <font color="#008844">; closure</font>
(functionp 'a) => T <font color="#008844">; symbol with a function value</font>
(setq b #'a) => A <font color="#008844">; function A stored in variable B</font>
(fboundp 'b) => NIL <font color="#008844">; no function B found</font>
(fboundp b) => T <font color="#008844">; variable B evaluates to function A</font>
(functionp #'(lambda () nil)) => T <font color="#008844">; closure</font>
(functionp '(lambda () nil)) => NIL <font color="#008844">; list</font>
(functionp (lambda () nil)) => T <font color="#008844">; closure</font>
(functionp #'functionp) => NIL <font color="#008844">; macro</font>
(let ((x nil)) <font color="#008844">; lexical variable</font>
(functionp x))
=> NIL
(flet ((y () nil)) <font color="#008844">; lexical closure</font>
(functionp y))
=> T
(labels ((z () nil)) <font color="#008844">; lexical closure</font>
(functionp z))
=> T
</pre>
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<a name="specialp"></a>
<hr>
<h2>specialp</h2>
<hr>
<pre class="example">
(defmacro <font color="#0000CC">specialp</font> (expr)
`(case (type-of ,expr)
(fsubr t)
(symbol (and (or (lfboundp ,expr) (fboundp ,expr))
(functionp (function ,(if (consp expr) (cadr expr) expr)))))
(t nil)))
</pre>
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<a name="macrop"></a>
<hr>
<h2>macrop</h2>
<hr>
<pre class="example">
(defmacro <font color="#0000CC">macrop</font> (expr)
`(case (type-of ,expr)
(closure (eq 'macro (car (get-lambda-expression ,expr))))
(symbol (and (or (lfboundp ,expr) (fboundp ,expr))
(macrop (function ,(if (consp expr) (cadr expr) expr)))))
(t nil)))
</pre>
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<a name="subrp"></a>
<hr>
<h2>subrp</h2>
<hr>
<p>The 'subrp' function returns T if the symbol is a build-in function.</p>
<pre class="example">
(defun <font color="#0000CC">subrp</font> (symbol)
(eq 'subr (type-of symbol)))
</pre>
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<a name="fsubrp"></a>
<hr>
<h2>fsubrp</h2>
<hr>
<p>The 'fsubrp' function returns T if the symbol is a build-in special
function.</p>
<pre class="example">
(defun <font color="#0000CC">fsubrp</font> (symbol)
(eq 'fsubr (type-of symbol)))
</pre>
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<a name="closurep"></a>
<hr>
<h2>closurep</h2>
<hr>
<p>The 'closurep' function returns T if the symbol is a user-defined
function.</p>
<pre class="example">
(defun <font color="#0000CC">closurep</font> (symbol)
(eq 'closure (type-of symbol)))
</pre>
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