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The directory where the OMake standard library files reside. At startup, the default value is determined as follows.
OMAKELIB environment variable, if set (must contain
an absolute path, if set), otherwise
HKEY_CURRENT_USER\SOFTWARE\MetaPRL\OMake\OMAKELIB and
HKEY_LOCAL_MACHINE\SOFTWARE\MetaPRL\OMake\OMAKELIB are looked up and the value is used,
if exist.
The current default value may be accessed by running omake --version
An array of directories specifying the lookup path for the include and open directives (see
Section 4.8).
The default value is an array of two elements — . and $(STDLIB).
Set to the machine architecture omake is running on. Possible values are
Unix (for all Unix versions, including Linux and Mac OS X), Win32
(for MS-Windows, OMake compiled with MSVC++ or Mingw), and Cygwin (for
MS-Windows, OMake compiled with Cygwin).
The name of the operating system for the current machine.
The hostname of the current machine.
The machine architecture, e.g. i386, sparc, etc.
The login name of the user executing the process.
The home directory of the user executing the process.
The command-line target strings. For example, if OMake is invoked with the following command line,
omake CFLAGS=1 foo bar.c
then TARGETS is defined as foo bar.c.
The BUILD_SUMMARY variable refers to the file that omake uses
to summarize a build (the message that is printed at the very end of a build).
The file is empty when the build starts. If you wish to add additional messages
to the build summary, you can edit/modify this file during the build.
For example, if you want to point out that some action was taken, you can append a message to the build summary.
foo: boo
echo "The file foo was built" >> $(BUILD_SUMMARY)
...build foo...
Whether certain commands should be verbose. A boolean flag that is false
by default and is set to true when OMake is invoked with the
--verbose option.
Boolean values in omake are represented by case-insensitive strings. The
false value can be represented by the strings false, no,
nil, undefined or 0, and everything else is true.
$(not e) : String
e : String
The not function negates a Boolean value.
For example, $(not false) expands to the string true, and
$(not hello world) expands to false.
$(equal e1, e2) : String
e1 : String
e2 : String
The equal function tests for equality of two values.
For example $(equal a, b) expands to false, and $(equal hello world, hello world) expands to true.
$(and e1, ..., en) : String
e1, ..., en: Sequence
The and function evaluates to the conjunction of its arguments.
For example, in the following code, X is true, and Y is false.
A = a
B = b
X = $(and $(equal $(A), a) true $(equal $(B), b))
Y = $(and $(equal $(A), a) true $(equal $(A), $(B)))
$(or e1, ..., en) : String
e1, ..., en: String Sequence
The or function evaluates to the disjunction of its arguments.
For example, in the following code, X is true, and Y is false.
A = a
B = b
X = $(or $(equal $(A), a) false $(equal $(A), $(B)))
Y = $(or $(equal $(A), $(B)) $(equal $(A), b))
$(if e1, e2[, e3]) : value
e1 : String
e2, e3 : value
The if function represents a conditional based on a Boolean value.
For example $(if $(equal a, b), c, d) evaluates to d.
Conditionals may also be declared with an alternate syntax.
if e1
body1
elseif e2
body2
...
else
bodyn
If the expression e1 is not false, then the expressions in body1
are evaluated and the result is returned as the value of the conditional. Otherwise,
if e1 evaluates to false, the evaluation continues with the e2
expression. If none of the conditional expressions is true, then the expressions
in bodyn are evaluated and the result is returned as the value
of the conditional.
There can be any number of elseif clauses; the else clause is
optional.
Note that each branch of the conditional defines its own scope, so variables
defined in the branches are normally not visible outside the conditional.
The export command may be used to export the variables defined in
a scope. For example, the following expression represents a common idiom
for defining the C compiler configuration.
if $(equal $(OSTYPE), Win32)
CC = cl
CFLAGS += /DWIN32
export
else
CC = gcc
CFLAGS += -g -O2
export
The switch and match functions perform pattern matching.
$(switch <arg>, <pattern_1>, <value_1>, ..., <pattern_n>, <value_n>)
$(match <arg>, <pattern_1>, <value_1>, ..., <pattern_n>, <value_n>)
The number of <pattern>/<value> pairs is arbitrary. They strictly
alternate; the total number of arguments to <match> must be odd.
The <arg> is evaluated to a string, and compared with <pattern_1>.
If it matches, the result of the expression is <value_1>. Otherwise
evaluation continues with the remaining patterns until a match is found.
If no pattern matches, the value is the empty string.
The switch function uses string comparison to compare
the argument with the patterns. For example, the following
expression defines the FILE variable to be either
foo, bar, or the empty string, depending
on the value of the OSTYPE variable.
FILE = $(switch $(OSTYPE), Win32, foo, Unix, bar)
The match function uses regular expression patterns (see the
grep function). If a match is found, the variables
$1, $2, ... are bound to the substrings matched between
\( and \) delimiters.
The $0 variable contains the entire match, and $*
is an array of the matched substrings.
to the matched substrings.
FILE = $(match foo_xyz/bar.a, foo_\\\(.*\\\)/\\\(.*\\\)\.a, foo_$2/$1.o)
The switch and match functions also have an alternate (more usable)
form.
match e
case pattern1
body1
case pattern2
body2
...
default
bodyd
If the value of expression e matches pattern_i and no previous pattern,
then body_i is evaluated and returned as the result of the match.
The switch function uses string comparison; the match function
uses regular expression matching.
match $(FILE)
case $".*\(\.[^\/.]*\)"
println(The string $(FILE) has suffix $1)
default
println(The string $(FILE) has no suffix)
try
try-body
catch class1(v1)
catch-body
when expr
when-body
...
finally
finally-body
The try form is used for exception handling.
First, the expressions in the try-body are evaluated.
If evaluation results in a value v without raising an
exception, then the expressions in the finally-body
are evaluated and the value v is returned as the result.
If evaluation of the try-body results in a exception object obj,
the catch clauses are examined in order. When examining catch
clause catch class(v), if the exception object obj
is an instance of the class name class, the variable v is bound
to the exception object, and the expressions in the catch-body
are evaluated.
If a when clause is encountered while a catch body is being evaluated,
the predicate expr is evaluated. If the result is true, evaluation continues
with the expressions in the when-body. Otherwise, the next catch
clause is considered for evaluation.
If evaluation of a catch-body or when-body completes successfully,
returning a value v, without encountering another when clause,
then the expressions in the finally-body
are evaluated and the value v is returned as the result.
There can be any number of catch clauses; the finally clause
is optional.
raise exn
exn : Exception
The raise function raises an exception.
The exn object can be any object. However,
the normal convention is to raise an Exception object.
If the exception is never caught, the whole object will be verbosely
printed in the error message. However, if the object is an Exception one
and contains a message field, only that field will be included in the
error message.
exit(code)
code : Int
The exit function terminates omake abnormally.
$(exit <code>)
The exit function takes one integer argument, which is exit code.
Non-zero values indicate abnormal termination.
$(defined sequence) : String
sequence : Sequence
The defined function test whether all the variables in the sequence are
currently defined. For example, the following code defines the X variable
if it is not already defined.
if $(not $(defined X))
X = a b c
export
It is acceptable to use qualified names.
$(defined X.a.b)
$(defined public.X)
$(defined-env sequence) : String
sequence : String
The defined-env function tests whether a variable is defined
as part of the process environment.
For example, the following code adds the -g compile
option if the environment variable DEBUG is defined.
if $(defined-env DEBUG)
CFLAGS += -g
export
$(getenv name) : String $(getenv name, default) : String
The getenv function gets the value of a variable from
the process environment. The function takes one or two arguments.
In the single argument form, an exception is raised if the variable variable is not defined in the environment. In the two-argument form, the second argument is returned as the result if the value is not defined.
For example, the following code defines the variable X
to be a space-separated list of elements of the PATH
environment variable if it is defined, and to /bin /usr/bin
otherwise.
X = $(split $(PATHSEP), $(getenv PATH, /bin:/usr/bin))
You may also use the alternate form.
getenv(NAME)
default
setenv(name, value)
name : String
value : String
The setenv function sets the value of a variable in
the process environment. Environment variables are scoped
like normal variables.
unsetenv(names)
names : String Array
The unsetenv function removes some variable definitions from
the process environment. Environment variables are scoped
like normal variables.
get-registry(hkey, key, field) : String
get-registry(hkey, key, field, default) : String
hkey : String
key : String
field : String
The get-registry function retrieves a string value from the
system registry on Win32. On other architectures, there is no
registry.
The hive (I think that is the right word), indicates which part
of the registry to use. It should be one of the following values.
HKEY_CLASSES_ROOT
HKEY_CURRENT_CONFIG
HKEY_CURRENT_USER
HKEY_LOCAL_MACHINE
HKEY_USERS
Refer to the Microsoft documentation if you want to know what these mean.
The key is the field you want to get from the registry.
It should have a form like A\B\C (if you use forward slashes, they will
be converted to backslashes). The field is the sub-field of the key.
In the 4-argument form, the default is returned on failure.
You may also use the alternate form.
get-registry(hkey, key, field)
default
$(getvar name) : String
The getvar function gets the value of a variable.
An exception is raised if the variable variable is not defined.
For example, the following code defines X to be the string abc.
NAME = foo
foo_1 = abc
X = $(getvar $(NAME)_1)
It is acceptable to use qualified names.
$(getvar X.a.b)
setvar(name, value)
name : String
value : String
The setvar function defines a new variable. For example, the
following code defines the variable X to be the string abc.
NAME = X setvar($(NAME), abc)
It is acceptable to use qualified names.
setvar(public.X, abc)
$(array elements) : Array
elements : Sequence
The array function creates an array from a sequence.
If the <arg> is a string, the elements of the array
are the whitespace-separated elements of the string, respecting
quotes.
In addition, array variables can be declared as follows.
A[] =
<val1>
...
<valn>
In this case, the elements of the array are exactly
<val1>, ..., <valn>, and whitespace is
preserved literally.
$(split sep, elements) : Array
sep : String
elements : Sequence
The split function takes two arguments, a string of separators, and
a string argument. The result is an array of elements determined by
splitting the elements by all occurrence of the separator in the
elements sequence.
For example, in the following code, the X variable is
defined to be the array /bin /usr/bin /usr/local/bin.
PATH = /bin:/usr/bin:/usr/local/bin
X = $(split :, $(PATH))
The sep argument may be omitted. In this case split breaks its
arguments along the white space. Quotations are not split.
$(concat sep, elements) : String
sep : String
elements : Sequence
The concat function takes two arguments, a separator string, and
a sequence of elements. The result is a string formed by concatenating
the elements, placing the separator between adjacent elements.
For example, in the following code, the X variable is
defined to be the string foo_x_bar_x_baz.
X = foo bar baz
Y = $(concat _x_, $(X))
$(length sequence) : Int
sequence : Sequence
The length function returns the number of elements in its argument.
For example, the expression $(length a b "c d") evaluates to 3.
$(nth i, sequence) : value
i : Int
sequence : Sequence
raises RuntimeException
The nth function returns the nth element of its argument, treated as
a list. Counting starts at 0. An exception is raised if the index is not in bounds.
For example, the expression $(nth 1, a "b c" d) evaluates to "b c".
$(replace-nth i, sequence, x) : value
i : Int
sequence : Sequence
x : value
raises RuntimeException
The replace-nth function replaces the nth element of its argument with a new
value x. Counting starts at 0. An exception is raised if the index is not in bounds.
For example, the expression $(replace-nth 1, a "b c" d, x) evaluates to a x d.
$(nth-hd i, sequence) : value
i : Int
sequence : Sequence
raises RuntimeException
The nth-hd function returns the first i elements of
the sequence. An exception is raised if the sequence is not
at least i elements long.
For example, the expression $(nth-hd 2, a "b c" d) evaluates to a "b c".
$(nth-tl i, sequence) : value
i : Int
sequence : Sequence
raises RuntimeException
The nth-tl function skips i elements of the sequence
and returns the rest. An exception is raised if the sequence is not
at least i elements long.
For example, the expression $(nth-tl 1, a "b c" d) evaluates to "b c" d.
$(subrange off, len, sequence) : value
off : Int
len : Int
sequence : Sequence
raises RuntimeException
The subrange function returns a subrange of the sequence.
Counting starts at 0. An exception is raised if the specified
range is not in bounds.
For example, the expression $(subrange 1, 2, a "b c" d e) evaluates to "b c" d.
$(rev sequence) : Sequence
sequence : Sequence
The rev function returns the elements of a sequence in reverse order.
For example, the expression $(rev a "b c" d) evaluates to d "b c" a.
$(join sequence1, sequence2) : Sequence
sequence1 : Sequence
sequence2 : Sequence
The join function joins together the elements of the two sequences. For example,
$(join a b c, .c .cpp .h) evaluates to a.c b.cpp c.h. If the two input
sequences have different lengths, the remainder of the longer sequence is copied at the end
of the output unmodified.
$(string sequence) : String
sequence : Sequence
The string function flattens a sequence into a single string.
This is similar to the concat function, but the elements are
separated by whitespace. The result is treated as a unit; whitespace
is significant.
$(string-length sequence) : Int
sequence : Sequence
The string-lenght returns a length (number of characters) in
its argument. If the argument is a sequence, it flattens it, so $(string-length sequence)
is equivalent to $(string-length $(string sequence)).
$(string-escaped sequence) : String Array
$(ocaml-escaped sequence) : String Array
$(html-escaped sequence) : String Array
$(html-pre-escaped sequence) : String Array
$(c-escaped sequence) : String Array
$(id-escaped sequence) : StringArray
$(sql-escaped sequence) : StringArray
$(uri-escaped sequence) : StringArray
sequence : Array
The string-escaped function converts each element of its
argument to a string, escaping it, if it contains symbols that are
special to OMake.
The special characters include :()\,$'"# and whitespace.
This function can be used in scanner rules to escape file names before
printing then to stdout.
The ocaml-escaped function converts each element of its
argument to a string, escaping characters that are special to OCaml.
The c-escaped function converts a string to a form that
can be used as a string constant in C.
The id-escaped function turns a string into an identifier that
may be used in OMake.
The html-escaped function turns a literal string into a form acceptable
as HTML. The html-pre-escaped function is similar, but it does not
translate newlines into <br>.
println($(string $(string-escaped $"a b" $"y:z")))
a\ b y\:z
$(hexify sequence) : sequence
sequence : Sequence
The function hexify converts a string to a HEX ASCII representation.
The inverse function is unhexify.
osh> hexify($"Hello world") - : <array <data "48656c6c6f"> <data "776f726c64">>
$(decode-uri sequence) : sequence
sequence : Sequence
These two functions perform URI encoding, where special characters are represented by hexadecimal characters.
osh> s = $(encode-uri $'a b~c')
"a+b%7ec"
osh> decode-uri($s)
"a b~c"
$(quote sequence) : String
sequence : Sequence
The quote function flattens a sequence into a single string
and adds quotes around the string. Inner quotation symbols are
escaped.
For example, the expression $(quote a "b c" d) evaluates
to "a \"b c\" d", and $(quote abc) evaluates to
"abc".
$(quote-argv sequence) : String
sequence : Sequence
The quote-argv function flattens a sequence into a single string,
and adds quotes around the string. The quotation is formed so that
a command-line parse can separate the string back into its components.
$(html-string sequence) : String
sequence : Sequence
The html-string function flattens a sequence into a single string,
and escapes special HTML characters.
This is similar to the concat function, but the elements are
separated by whitespace. The result is treated as a unit; whitespace
inside sequence elements is preserved literally.
$(addsuffix suffix, sequence) : Array
suffix : String
sequence : Sequence
The addsuffix function adds a suffix to each component of sequence.
The number of elements in the array is exactly the same as the number of
elements in the sequence.
For example, $(addsuffix .c, a b "c d") evaluates to a.c b.c "c d".c.
$(mapsuffix suffix, sequence) : Array
suffix : value
sequence : Sequence
The mapsuffix function adds a suffix to each component of sequence.
It is similar to addsuffix, but uses array concatenation instead
of string concatenation. The number of elements in the array is
twice the number of elements in the sequence.
For example, $(mapsuffix .c, a b "c d") evaluates to a .c b .c "c d" .c.
$(addsuffixes suffixes, sequence) : Array
suffixes : Sequence
sequence : Sequence
$(addprefixes prefixes, sequence) : Array
prefixes : Sequence
sequence : Sequence
The addsuffixes function adds all suffixes in its first argument
to each component of a sequence. If suffixes has n elements,
and sequence has m elements, the the result has n * m elements.
For example, the $(addsuffixes .c .o, a b c) expressions evaluates to
a.c a.o b.c b.o c.o c.a.
$(addprefixes prefixes, sequence) is roughly equivalent to $(addsuffixes sequence, prefixes).
$(removeprefix prefix, sequence) : Array
prefix : String
sequence : Array
The removeprefix function removes a prefix from each component
of a sequence.
$(removesuffix sequence) : Array
sequence : String
The removesuffix function removes the suffixes from each component
of a sequence.
For example, $(removesuffix a.c b.foo "c d") expands to a b "c d".
$(replacesuffixes old-suffixes, new-suffixes, sequence) : Array
old-suffixes : Sequence
new-suffixes : Sequence
sequence : Sequence
The replacesuffixes function modifies the suffix of each component
in sequence. The old-suffixes and new-suffixes sequences
should have the same length.
For example, $(replacesuffixes .h .c, .o .o, a.c b.h c.z) expands to a.o b.o c.z.
$(addprefix prefix, sequence) : Array
prefix : String
sequence : Sequence
The addprefix function adds a prefix to each component of a sequence.
The number of element in the result array is exactly the same as the number
of elements in the argument sequence.
For example, $(addprefix foo/, a b "c d") evaluates to foo/a foo/b foo/"c d".
$(mapprefix prefix, sequence) : Array
prefix : String
sequence : Sequence
The mapprefix function adds a prefix to each component of a sequence.
It is similar to addprefix, but array concatenation is used instead of
string concatenation. The result array contains twice as many elements
as the argument sequence.
For example, $(mapprefix foo, a b "c d") expands to foo a foo b foo "c d".
$(add-wrapper prefix, suffix, sequence) : Array
prefix : String
suffix : String
sequence : Sequence
The add-wrapper functions adds both a prefix and a suffix to each component of a sequence.
For example, the expression $(add-wrapper dir/, .c, a b) evaluates to
dir/a.c dir/b.c. String concatenation is used. The array result
has the same number of elements as the argument sequence.
$(set sequence) : Array
sequence : Sequence
The set function sorts a set of string components, eliminating duplicates.
For example, $(set z y z "m n" w a) expands to "m n" a w y z.
$(mem elem, sequence) : Boolean
elem : String
sequence : Sequence
The mem function tests for membership in a sequence.
For example, $(mem "m n", y z "m n" w a) evaluates to true,
while $(mem m n, y z "m n" w a) evaluates to false.
$(intersection sequence1, sequence2) : Array
sequence1 : Sequence
sequence2 : Sequence
The intersection function takes two arguments, treats them
as sets of strings, and computes their intersection. The order of the result
is undefined, and it may contain duplicates. Use the set
function to sort the result and eliminate duplicates in the result
if desired.
For example, the expression $(intersection c a b a, b a) evaluates to
a b a.
$(intersects sequence1, sequence2) : Boolean
sequence1 : Sequence
sequence2 : Sequence
The intersects function tests whether two sets have a non-empty intersection.
This is slightly more efficient than computing the intersection and testing whether
it is empty.
For example, the expression $(intersects a b c, d c e) evaluates to true,
and $(intersects a b c a, d e f) evaluates to false.
$(set-diff sequence1, sequence2) : Array
sequence1 : Sequence
sequence2 : Sequence
The set-diff function takes two arguments, treats them
as sets of strings, and computes their difference (all the elements of the
first set that are not present in the second one). The order of the result
is undefined and it may contain duplicates. Use the set
function to sort the result and eliminate duplicates in the result
if desired.
For example, the expression $(set-diff c a b a e, b a) evaluates to
c e.
$(filter patterns, sequence) : Array
patterns : Sequence
sequence : Sequence
The filter function picks elements from a sequence.
The patterns is a non-empty sequence of patterns, each may contain one occurrence of the wildcard
% character.
For example $(filter %.h %.o, a.c x.o b.h y.o "hello world".c) evaluates to x.o b.h y.o.
$(filter-out patterns, sequence) : Array
patterns : Sequence
sequence : Sequence
The filter-out function removes elements from a sequence.
The patterns is a non-empty sequence of patterns, each may contain one occurrence of the wildcard
% character.
For example $(filter-out %.c %.h, a.c x.o b.h y.o "hello world".c) evaluates to x.o y.o.
$(capitalize sequence) : Array
sequence : Sequence
The capitalize function capitalizes each word in a sequence.
For example, $(capitalize through the looking Glass) evaluates to
Through The Looking Glass.
$(uncapitalize sequence) : Array
sequence : Sequence
The uncapitalize function uncapitalizes each word in its argument.
For example, $(uncapitalize through the looking Glass) evaluates to
through the looking glass.
$(uppercase sequence) : Array
sequence : Sequence
The uppercase function converts each word in a sequence to uppercase.
For example, $(uppercase through the looking Glass) evaluates to
THROUGH THE LOOKING GLASS.
$(lowercase sequence) : Array
sequence : Sequence
The lowercase function reduces each word in its argument to lowercase.
For example, $(lowercase through tHe looking Glass) evaluates to
through the looking glass.
system(s)
s : Sequence
The system function is used to evaluate a shell expression.
This function is used internally by omake to evaluate
shell commands.
For example, the following program is equivalent to the
expression system(ls foo).
ls foo
$(shell command) : Array
$(shella command) : Array
$(shell-code command) : Int
command : Sequence
The shell function evaluates a command using the command shell,
and returns the whitespace-separated words of the standard output as the result.
The shella function acts similarly, but it returns the lines
as separate items in the array.
The shell-code function returns the exit code. The output is not
diverted.
For example, if the current directory contains the files OMakeroot,
OMakefile, and hello.c, then $(shell ls) evaluates to
hello.c OMakefile OMakeroot (on a Unix system).
The export function allows one to capture the current environment in a variable.
For example, the following code:
A = 1 B = 1 C = 1 SAVE_ENV = $(export A B) A = 2 B = 2 C = 2 export($(SAVE_ENV)) println($A $B $C)
will print 1 1 2.
The arguments to this function are interpreted the exact same way as the arguments to the export
special form (see Section 6.3).
while <test>
<body>
–or–
while <test>
case <test1>
<body1>
...
case <testn>
<bodyn>
default
<bodyd>
The loop is executed while the test is true.
In the first form, the <body> is executed on every loop iteration.
In the second form, the body <bodyI> is selected, as the first
case where the test <testI> is true. If none apply, the optional
default case is evaluated. If no cases are true, the loop exits.
The environment is automatically exported.
Examples.
Iterate for i from 0 to 9.
i = 0
while $(lt $i, 10)
echo $i
i = $(add $i, 1)
The following example is equivalent.
i = 0
while true
case $(lt $i, 10)
echo $i
i = $(add $i, 1)
The following example is similar, but some special cases are printed. value is printed.
i = 0
while $(lt $i, 10)
case $(equal $i, 0)
echo zero
i = $(add $i, 1)
case $(equal $i, 1)
echo one
i = $(add $i, 1)
default
echo $i
i = $(add $i, 1)
The break function can be used to break out of the while loop
early.
break
Terminate execution of the innermost loop, returning the current state.
random-init(i)
i : Int
random() : Int
Produce a random number. The numbers are pseudo-random, and are not cryptographically secure.
The generator is initialized from semi-random system data.
Subsequent runs should produce different results.
The rando-init function can be used to return
the generator to a known state.
The int function can be used to create integers.
It returns an Int object.
$(int 17).
The float function can be used to create floating-point numbers.
It returns a Float object.
$(float 3.1415926).
The following functions can be used to perform basic arithmetic.
$(neg <numbers>): arithmetic inverse
$(add <numbers>): addition.
$(sub <numbers>): subtraction.
$(mul <numbers>): multiplication.
$(div <numbers>): division.
$(mod <numbers>): remainder.
$(lnot <numbers>): bitwise inverse.
$(land <numbers>): bitwise and.
$(lor <numbers>): bitwise or.
$(lxor <numbers>): bitwise exclusive-or.
$(lsl <numbers>): logical shift left.
$(lsr <numbers>): logical shift right.
$(asr <numbers>): arithmetic shift right.
$(min <numbers>): smallest element.
$(max <numbers>): largest element.
The following functions can be used to perform numerical comparisons.
$(lt <numbers>): less then.
$(le <numbers>): no more than.
$(eq <numbers>): equal.
$(ge <numbers>): no less than.
$(gt <numbers>): greater than.
$(ult <numbers>): unsigned less than.
$(ule <numbers>): unsigned greater than.
$(uge <numbers>): unsigned greater than or equal.
$(ugt <numbers>): unsigned greater than.
The fun form introduces anonymous functions.
$(fun <v1>, ..., <vn> => <body>)
The last argument is the body of the function. The other arguments are the parameter names.
The three following definitions are equivalent.
F(X, Y) =
return($(addsuffix $(Y), $(X)))
F = $(fun X, Y => $(addsuffix $(Y), $(X)))
F =
fun(X, Y) =>
value $(addsuffix $(Y), $(X))
The apply operator is used to apply a function.
$(apply <fun>, <args>)
Suppose we have the following function definition.
F(X, Y) =
return($(addsuffix $(Y), $(X)))
The the two expressions below are equivalent.
X = F(a b c, .c)
X = $(apply $(F), a b c, .c)
The apply form can also be used for partial applications,
where a function is passed fewer arguments than it expects. The
result is a function that takes the remaining arguments,
and calls the function with the full set of arguments.
add2(i, j) =
add($i, $j)
succ = $(apply $(add2), 1)
i = $(succ 5) # Computes 1+5
The applya operator is used to apply a function to
an array of arguments.
$(applya <fun>, <args>)
For example, in the following program, the value
of Z is file.c.
F(X, Y) =
return($(addsuffix $(Y), $(X)))
args[] =
file
.c
Z = $(applya $(F), $(args))
The applya form can also be used for partial applications.
The create-map is a simplified form for creating Map objects.
The create-map function takes an even number of arguments that specify
key/value pairs. For example, the following values are equivalent.
X = $(create-map name1, xxx, name2, yyy)
X. =
extends $(Map)
$|name1| = xxx
$|name2| = yyy
The create-lazy-map function is similar, but the values are computed
lazily. The following two definitions are equivalent.
Y = $(create-lazy-map name1, $(xxx), name2, $(yyy))
Y. =
extends $(Map)
$|name1| = $`(xxx)
$|name2| = $`(yyy)
The create-lazy-map function is used in rule construction.
The foreach function maps a function over a sequence.
$(foreach <fun>, <args>)
foreach(<var> => ..., <args>)
<body>
For example, the following program defines the variable X
as an array a.c b.c c.c.
X =
foreach(x => ..., a b c)
value $(x).c
# Equivalent expression
X = $(foreach $(fun x => ..., $(x).c), a b c)
There is also an abbreviated syntax.
The export form can also be used in a foreach
body. The final value of X is a.c b.c c.c.
X =
foreach(x => ..., a b c)
X += $(x).c
export
The break function can be used to break out of the loop early.
The forall function tests whether a predicate holds for each
element of a sequence.
$(sequence-forall <fun>, <args>)
sequence-forall(<var> => ..., <args>)
<body>
The exists function tests whether a predicate holds for
some element of a sequence.
$(sequence-exists <fun>, <args>)
sequence-exists(<var> => ..., <args>)
<body>
The sort function sorts the elements in an array,
given a comparison function. Given two elements (x, y),
the comparison should return a negative number if x < y;
a positive number if x > y; and 0 if x = y.
$(sequence-sort <fun>, <args>)
sort(<var>, <var> => ..., <args>)
<body>
The compare function compares two values (x, y) generically
returning a negative number if x < y;
a positive number if x > y; and 0 if x = y.
$(compare x, y) : Int
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