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clojure.core

Fundamental library of the Clojure language

Fundamental library of the Clojure language
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clojure.core.reducers

A library for reduction and parallel folding. Alpha and subject to change.

A library for reduction and parallel folding. Alpha and subject
to change.
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clojure.data

Non-core data functions.

Non-core data functions.
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clojure.datafy

Functions to turn objects into data. Alpha, subject to change

Functions to turn objects into data. Alpha, subject to change
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clojure.edn

edn reading.

edn reading.
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clojure.java.browse

Start a web browser from Clojure

Start a web browser from Clojure
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clojure.java.browse-ui

Helper namespace for clojure.java.browse. Prevents console apps from becoming GUI unnecessarily.

Helper namespace for clojure.java.browse.
Prevents console apps from becoming GUI unnecessarily.
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No vars found in this namespace.

clojure.java.io

This file defines polymorphic I/O utility functions for Clojure.

This file defines polymorphic I/O utility functions for Clojure.
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clojure.java.shell

Conveniently launch a sub-process providing its stdin and collecting its stdout

Conveniently launch a sub-process providing its stdin and
collecting its stdout
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clojure.pprint

A Pretty Printer for Clojure

clojure.pprint implements a flexible system for printing structured data in a pleasing, easy-to-understand format. Basic use of the pretty printer is simple, just call pprint instead of println. More advanced users can use the building blocks provided to create custom output formats.

Out of the box, pprint supports a simple structured format for basic data and a specialized format for Clojure source code. More advanced formats, including formats that don't look like Clojure data at all like XML and JSON, can be rendered by creating custom dispatch functions.

In addition to the pprint function, this module contains cl-format, a text formatting function which is fully compatible with the format function in Common Lisp. Because pretty printing directives are directly integrated with cl-format, it supports very concise custom dispatch. It also provides a more powerful alternative to Clojure's standard format function.

See documentation for pprint and cl-format for more information or complete documentation on the Clojure web site on GitHub.

A Pretty Printer for Clojure

clojure.pprint implements a flexible system for printing structured data
in a pleasing, easy-to-understand format. Basic use of the pretty printer is 
simple, just call pprint instead of println. More advanced users can use 
the building blocks provided to create custom output formats. 

Out of the box, pprint supports a simple structured format for basic data 
and a specialized format for Clojure source code. More advanced formats, 
including formats that don't look like Clojure data at all like XML and 
JSON, can be rendered by creating custom dispatch functions. 

In addition to the pprint function, this module contains cl-format, a text 
formatting function which is fully compatible with the format function in 
Common Lisp. Because pretty printing directives are directly integrated with
cl-format, it supports very concise custom dispatch. It also provides
a more powerful alternative to Clojure's standard format function.

See documentation for pprint and cl-format for more information or 
complete documentation on the Clojure web site on GitHub.
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clojure.reflect

Reflection on Host Types Alpha - subject to change.

Two main entry points:

  • type-reflect reflects on something that implements TypeReference.
  • reflect (for REPL use) reflects on the class of an instance, or on a class if passed a class

Key features:

  • Exposes the read side of reflection as pure data. Reflecting on a type returns a map with keys :bases, :flags, and :members.

  • Canonicalizes class names as Clojure symbols. Types can extend to the TypeReference protocol to indicate that they can be unambiguously resolved as a type name. The canonical format requires one non-Java-ish convention: array brackets are <> instead of [] so they can be part of a Clojure symbol.

  • Pluggable Reflectors for different implementations. The default JavaReflector is good when you have a class in hand, or use the AsmReflector for "hands off" reflection without forcing classes to load.

Platform implementers must:

  • Create an implementation of Reflector.
  • Create one or more implementations of TypeReference.
  • def default-reflector to be an instance that satisfies Reflector.
Reflection on Host Types
Alpha - subject to change.

Two main entry points: 

* type-reflect reflects on something that implements TypeReference.
* reflect (for REPL use) reflects on the class of an instance, or
  on a class if passed a class

Key features:

* Exposes the read side of reflection as pure data. Reflecting
  on a type returns a map with keys :bases, :flags, and :members.

* Canonicalizes class names as Clojure symbols. Types can extend
  to the TypeReference protocol to indicate that they can be
  unambiguously resolved as a type name. The canonical format
  requires one non-Java-ish convention: array brackets are <>
  instead of [] so they can be part of a Clojure symbol.

* Pluggable Reflectors for different implementations. The default
  JavaReflector is good when you have a class in hand, or use
  the AsmReflector for "hands off" reflection without forcing
  classes to load.

Platform implementers must:

* Create an implementation of Reflector.
* Create one or more implementations of TypeReference.
* def default-reflector to be an instance that satisfies Reflector.
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clojure.repl

Utilities meant to be used interactively at the REPL

Utilities meant to be used interactively at the REPL
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clojure.set

Set operations such as union/intersection.

Set operations such as union/intersection.
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clojure.stacktrace

Print stack traces oriented towards Clojure, not Java.

Print stack traces oriented towards Clojure, not Java.
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clojure.string

Clojure String utilities

It is poor form to (:use clojure.string). Instead, use require with :as to specify a prefix, e.g.

(ns your.namespace.here (:require [clojure.string :as str]))

Design notes for clojure.string:

  1. Strings are objects (as opposed to sequences). As such, the string being manipulated is the first argument to a function; passing nil will result in a NullPointerException unless documented otherwise. If you want sequence-y behavior instead, use a sequence.

  2. Functions are generally not lazy, and call straight to host methods where those are available and efficient.

  3. Functions take advantage of String implementation details to write high-performing loop/recurs instead of using higher-order functions. (This is not idiomatic in general-purpose application code.)

  4. When a function is documented to accept a string argument, it will take any implementation of the correct interface on the host platform. In Java, this is CharSequence, which is more general than String. In ordinary usage you will almost always pass concrete strings. If you are doing something unusual, e.g. passing a mutable implementation of CharSequence, then thread-safety is your responsibility.

Clojure String utilities

It is poor form to (:use clojure.string). Instead, use require
with :as to specify a prefix, e.g.

(ns your.namespace.here
  (:require [clojure.string :as str]))

Design notes for clojure.string:

1. Strings are objects (as opposed to sequences). As such, the
   string being manipulated is the first argument to a function;
   passing nil will result in a NullPointerException unless
   documented otherwise. If you want sequence-y behavior instead,
   use a sequence.

2. Functions are generally not lazy, and call straight to host
   methods where those are available and efficient.

3. Functions take advantage of String implementation details to
   write high-performing loop/recurs instead of using higher-order
   functions. (This is not idiomatic in general-purpose application
   code.)

4. When a function is documented to accept a string argument, it
   will take any implementation of the correct *interface* on the
   host platform. In Java, this is CharSequence, which is more
   general than String. In ordinary usage you will almost always
   pass concrete strings. If you are doing something unusual,
   e.g. passing a mutable implementation of CharSequence, then
   thread-safety is your responsibility.
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clojure.template

Macros that expand to repeated copies of a template expression.

Macros that expand to repeated copies of a template expression.
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clojure.test

A unit testing framework.

ASSERTIONS

The core of the library is the "is" macro, which lets you make assertions of any arbitrary expression:

(is (= 4 (+ 2 2))) (is (instance? Integer 256)) (is (.startsWith "abcde" "ab"))

You can type an "is" expression directly at the REPL, which will print a message if it fails.

user> (is (= 5 (+ 2 2)))

FAIL in  (:1)
expected: (= 5 (+ 2 2))
  actual: (not (= 5 4))
false

The "expected:" line shows you the original expression, and the "actual:" shows you what actually happened. In this case, it shows that (+ 2 2) returned 4, which is not = to 5. Finally, the "false" on the last line is the value returned from the expression. The "is" macro always returns the result of the inner expression.

There are two special assertions for testing exceptions. The "(is (thrown? c ...))" form tests if an exception of class c is thrown:

(is (thrown? ArithmeticException (/ 1 0)))

"(is (thrown-with-msg? c re ...))" does the same thing and also tests that the message on the exception matches the regular expression re:

(is (thrown-with-msg? ArithmeticException #"Divide by zero" (/ 1 0)))

DOCUMENTING TESTS

"is" takes an optional second argument, a string describing the assertion. This message will be included in the error report.

(is (= 5 (+ 2 2)) "Crazy arithmetic")

In addition, you can document groups of assertions with the "testing" macro, which takes a string followed by any number of assertions. The string will be included in failure reports. Calls to "testing" may be nested, and all of the strings will be joined together with spaces in the final report, in a style similar to RSpec http://rspec.info/

(testing "Arithmetic" (testing "with positive integers" (is (= 4 (+ 2 2))) (is (= 7 (+ 3 4)))) (testing "with negative integers" (is (= -4 (+ -2 -2))) (is (= -1 (+ 3 -4)))))

Note that, unlike RSpec, the "testing" macro may only be used INSIDE a "deftest" or "with-test" form (see below).

DEFINING TESTS

There are two ways to define tests. The "with-test" macro takes a defn or def form as its first argument, followed by any number of assertions. The tests will be stored as metadata on the definition.

(with-test (defn my-function [x y] (+ x y)) (is (= 4 (my-function 2 2))) (is (= 7 (my-function 3 4))))

As of Clojure SVN rev. 1221, this does not work with defmacro. See http://code.google.com/p/clojure/issues/detail?id=51

The other way lets you define tests separately from the rest of your code, even in a different namespace:

(deftest addition (is (= 4 (+ 2 2))) (is (= 7 (+ 3 4))))

(deftest subtraction (is (= 1 (- 4 3))) (is (= 3 (- 7 4))))

This creates functions named "addition" and "subtraction", which can be called like any other function. Therefore, tests can be grouped and composed, in a style similar to the test framework in Peter Seibel's "Practical Common Lisp" http://www.gigamonkeys.com/book/practical-building-a-unit-test-framework.html

(deftest arithmetic (addition) (subtraction))

The names of the nested tests will be joined in a list, like "(arithmetic addition)", in failure reports. You can use nested tests to set up a context shared by several tests.

RUNNING TESTS

Run tests with the function "(run-tests namespaces...)":

(run-tests 'your.namespace 'some.other.namespace)

If you don't specify any namespaces, the current namespace is used. To run all tests in all namespaces, use "(run-all-tests)".

By default, these functions will search for all tests defined in a namespace and run them in an undefined order. However, if you are composing tests, as in the "arithmetic" example above, you probably do not want the "addition" and "subtraction" tests run separately. In that case, you must define a special function named "test-ns-hook" that runs your tests in the correct order:

(defn test-ns-hook [] (arithmetic))

Note: test-ns-hook prevents execution of fixtures (see below).

OMITTING TESTS FROM PRODUCTION CODE

You can bind the variable "load-tests" to false when loading or compiling code in production. This will prevent any tests from being created by "with-test" or "deftest".

FIXTURES

Fixtures allow you to run code before and after tests, to set up the context in which tests should be run.

A fixture is just a function that calls another function passed as an argument. It looks like this:

(defn my-fixture [f] Perform setup, establish bindings, whatever. (f) Then call the function we were passed. Tear-down / clean-up code here. )

Fixtures are attached to namespaces in one of two ways. "each" fixtures are run repeatedly, once for each test function created with "deftest" or "with-test". "each" fixtures are useful for establishing a consistent before/after state for each test, like clearing out database tables.

"each" fixtures can be attached to the current namespace like this: (use-fixtures :each fixture1 fixture2 ...) The fixture1, fixture2 are just functions like the example above. They can also be anonymous functions, like this: (use-fixtures :each (fn [f] setup... (f) cleanup...))

The other kind of fixture, a "once" fixture, is only run once, around ALL the tests in the namespace. "once" fixtures are useful for tasks that only need to be performed once, like establishing database connections, or for time-consuming tasks.

Attach "once" fixtures to the current namespace like this: (use-fixtures :once fixture1 fixture2 ...)

Note: Fixtures and test-ns-hook are mutually incompatible. If you are using test-ns-hook, fixture functions will never be run.

SAVING TEST OUTPUT TO A FILE

All the test reporting functions write to the var test-out. By default, this is the same as out, but you can rebind it to any PrintWriter. For example, it could be a file opened with clojure.java.io/writer.

EXTENDING TEST-IS (ADVANCED)

You can extend the behavior of the "is" macro by defining new methods for the "assert-expr" multimethod. These methods are called during expansion of the "is" macro, so they should return quoted forms to be evaluated.

You can plug in your own test-reporting framework by rebinding the "report" function: (report event)

The 'event' argument is a map. It will always have a :type key, whose value will be a keyword signaling the type of event being reported. Standard events with :type value of :pass, :fail, and :error are called when an assertion passes, fails, and throws an exception, respectively. In that case, the event will also have the following keys:

:expected The form that was expected to be true :actual A form representing what actually occurred :message The string message given as an argument to 'is'

The "testing" strings will be a list in "testing-contexts", and the vars being tested will be a list in "testing-vars".

Your "report" function should wrap any printing calls in the "with-test-out" macro, which rebinds out to the current value of test-out.

For additional event types, see the examples in the code.

A unit testing framework.

ASSERTIONS

The core of the library is the "is" macro, which lets you make
assertions of any arbitrary expression:

(is (= 4 (+ 2 2)))
(is (instance? Integer 256))
(is (.startsWith "abcde" "ab"))

You can type an "is" expression directly at the REPL, which will
print a message if it fails.

    user> (is (= 5 (+ 2 2)))

    FAIL in  (:1)
    expected: (= 5 (+ 2 2))
      actual: (not (= 5 4))
    false

The "expected:" line shows you the original expression, and the
"actual:" shows you what actually happened.  In this case, it
shows that (+ 2 2) returned 4, which is not = to 5.  Finally, the
"false" on the last line is the value returned from the
expression.  The "is" macro always returns the result of the
inner expression.

There are two special assertions for testing exceptions.  The
"(is (thrown? c ...))" form tests if an exception of class c is
thrown:

(is (thrown? ArithmeticException (/ 1 0))) 

"(is (thrown-with-msg? c re ...))" does the same thing and also
tests that the message on the exception matches the regular
expression re:

(is (thrown-with-msg? ArithmeticException #"Divide by zero"
                      (/ 1 0)))

DOCUMENTING TESTS

"is" takes an optional second argument, a string describing the
assertion.  This message will be included in the error report.

(is (= 5 (+ 2 2)) "Crazy arithmetic")

In addition, you can document groups of assertions with the
"testing" macro, which takes a string followed by any number of
assertions.  The string will be included in failure reports.
Calls to "testing" may be nested, and all of the strings will be
joined together with spaces in the final report, in a style
similar to RSpec <http://rspec.info/>

(testing "Arithmetic"
  (testing "with positive integers"
    (is (= 4 (+ 2 2)))
    (is (= 7 (+ 3 4))))
  (testing "with negative integers"
    (is (= -4 (+ -2 -2)))
    (is (= -1 (+ 3 -4)))))

Note that, unlike RSpec, the "testing" macro may only be used
INSIDE a "deftest" or "with-test" form (see below).


DEFINING TESTS

There are two ways to define tests.  The "with-test" macro takes
a defn or def form as its first argument, followed by any number
of assertions.  The tests will be stored as metadata on the
definition.

(with-test
    (defn my-function [x y]
      (+ x y))
  (is (= 4 (my-function 2 2)))
  (is (= 7 (my-function 3 4))))

As of Clojure SVN rev. 1221, this does not work with defmacro.
See http://code.google.com/p/clojure/issues/detail?id=51

The other way lets you define tests separately from the rest of
your code, even in a different namespace:

(deftest addition
  (is (= 4 (+ 2 2)))
  (is (= 7 (+ 3 4))))

(deftest subtraction
  (is (= 1 (- 4 3)))
  (is (= 3 (- 7 4))))

This creates functions named "addition" and "subtraction", which
can be called like any other function.  Therefore, tests can be
grouped and composed, in a style similar to the test framework in
Peter Seibel's "Practical Common Lisp"
<http://www.gigamonkeys.com/book/practical-building-a-unit-test-framework.html>

(deftest arithmetic
  (addition)
  (subtraction))

The names of the nested tests will be joined in a list, like
"(arithmetic addition)", in failure reports.  You can use nested
tests to set up a context shared by several tests.


RUNNING TESTS

Run tests with the function "(run-tests namespaces...)":

(run-tests 'your.namespace 'some.other.namespace)

If you don't specify any namespaces, the current namespace is
used.  To run all tests in all namespaces, use "(run-all-tests)".

By default, these functions will search for all tests defined in
a namespace and run them in an undefined order.  However, if you
are composing tests, as in the "arithmetic" example above, you
probably do not want the "addition" and "subtraction" tests run
separately.  In that case, you must define a special function
named "test-ns-hook" that runs your tests in the correct order:

(defn test-ns-hook []
  (arithmetic))

Note: test-ns-hook prevents execution of fixtures (see below).


OMITTING TESTS FROM PRODUCTION CODE

You can bind the variable "*load-tests*" to false when loading or
compiling code in production.  This will prevent any tests from
being created by "with-test" or "deftest".


FIXTURES

Fixtures allow you to run code before and after tests, to set up
the context in which tests should be run.

A fixture is just a function that calls another function passed as
an argument.  It looks like this:

(defn my-fixture [f]
   Perform setup, establish bindings, whatever.
  (f)  Then call the function we were passed.
   Tear-down / clean-up code here.
 )

Fixtures are attached to namespaces in one of two ways.  "each"
fixtures are run repeatedly, once for each test function created
with "deftest" or "with-test".  "each" fixtures are useful for
establishing a consistent before/after state for each test, like
clearing out database tables.

"each" fixtures can be attached to the current namespace like this:
(use-fixtures :each fixture1 fixture2 ...)
The fixture1, fixture2 are just functions like the example above.
They can also be anonymous functions, like this:
(use-fixtures :each (fn [f] setup... (f) cleanup...))

The other kind of fixture, a "once" fixture, is only run once,
around ALL the tests in the namespace.  "once" fixtures are useful
for tasks that only need to be performed once, like establishing
database connections, or for time-consuming tasks.

Attach "once" fixtures to the current namespace like this:
(use-fixtures :once fixture1 fixture2 ...)

Note: Fixtures and test-ns-hook are mutually incompatible.  If you
are using test-ns-hook, fixture functions will *never* be run.


SAVING TEST OUTPUT TO A FILE

All the test reporting functions write to the var *test-out*.  By
default, this is the same as *out*, but you can rebind it to any
PrintWriter.  For example, it could be a file opened with
clojure.java.io/writer.


EXTENDING TEST-IS (ADVANCED)

You can extend the behavior of the "is" macro by defining new
methods for the "assert-expr" multimethod.  These methods are
called during expansion of the "is" macro, so they should return
quoted forms to be evaluated.

You can plug in your own test-reporting framework by rebinding
the "report" function: (report event)

The 'event' argument is a map.  It will always have a :type key,
whose value will be a keyword signaling the type of event being
reported.  Standard events with :type value of :pass, :fail, and
:error are called when an assertion passes, fails, and throws an
exception, respectively.  In that case, the event will also have
the following keys:

  :expected   The form that was expected to be true
  :actual     A form representing what actually occurred
  :message    The string message given as an argument to 'is'

The "testing" strings will be a list in "*testing-contexts*", and
the vars being tested will be a list in "*testing-vars*".

Your "report" function should wrap any printing calls in the
"with-test-out" macro, which rebinds *out* to the current value
of *test-out*.

For additional event types, see the examples in the code.
raw docstring

clojure.test.junit

clojure.test extension for JUnit-compatible XML output.

JUnit (http://junit.org/) is the most popular unit-testing library for Java. As such, tool support for JUnit output formats is common. By producing compatible output from tests, this tool support can be exploited.

To use, wrap any calls to clojure.test/run-tests in the with-junit-output macro, like this:

(use 'clojure.test) (use 'clojure.test.junit)

(with-junit-output (run-tests 'my.cool.library))

To write the output to a file, rebind clojure.test/test-out to your own PrintWriter (perhaps opened using clojure.java.io/writer).

clojure.test extension for JUnit-compatible XML output.

JUnit (http://junit.org/) is the most popular unit-testing library
for Java.  As such, tool support for JUnit output formats is
common.  By producing compatible output from tests, this tool
support can be exploited.

To use, wrap any calls to clojure.test/run-tests in the
with-junit-output macro, like this:

  (use 'clojure.test)
  (use 'clojure.test.junit)

  (with-junit-output
    (run-tests 'my.cool.library))

To write the output to a file, rebind clojure.test/*test-out* to
your own PrintWriter (perhaps opened using
clojure.java.io/writer).
raw docstring

clojure.test.tap

clojure.test extensions for the Test Anything Protocol (TAP)

TAP is a simple text-based syntax for reporting test results. TAP was originally developed for Perl, and now has implementations in several languages. For more information on TAP, see http://testanything.org/ and http://search.cpan.org/~petdance/TAP-1.0.0/TAP.pm

To use this library, wrap any calls to clojure.test/run-tests in the with-tap-output macro, like this:

(use 'clojure.test) (use 'clojure.test.tap)

(with-tap-output (run-tests 'my.cool.library))

clojure.test extensions for the Test Anything Protocol (TAP)

TAP is a simple text-based syntax for reporting test results.  TAP
was originally developed for Perl, and now has implementations in
several languages.  For more information on TAP, see
http://testanything.org/ and
http://search.cpan.org/~petdance/TAP-1.0.0/TAP.pm

To use this library, wrap any calls to
clojure.test/run-tests in the with-tap-output macro,
like this:

  (use 'clojure.test)
  (use 'clojure.test.tap)

  (with-tap-output
   (run-tests 'my.cool.library))
raw docstring

clojure.uuid

No vars found in this namespace.

clojure.walk

This file defines a generic tree walker for Clojure data structures. It takes any data structure (list, vector, map, set, seq), calls a function on every element, and uses the return value of the function in place of the original. This makes it fairly easy to write recursive search-and-replace functions, as shown in the examples.

Note: "walk" supports all Clojure data structures EXCEPT maps created with sorted-map-by. There is no (obvious) way to retrieve the sorting function.

This file defines a generic tree walker for Clojure data
structures.  It takes any data structure (list, vector, map, set,
seq), calls a function on every element, and uses the return value
of the function in place of the original.  This makes it fairly
easy to write recursive search-and-replace functions, as shown in
the examples.

Note: "walk" supports all Clojure data structures EXCEPT maps
created with sorted-map-by.  There is no (obvious) way to retrieve
the sorting function.
raw docstring

clojure.zip

Functional hierarchical zipper, with navigation, editing, and enumeration. See Huet

Functional hierarchical zipper, with navigation, editing,
and enumeration.  See Huet
raw docstring

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