- How to Converting Between Shen and Lisp Data Types
- How to Qualifying Common Lisp Functions in Shen
- How to Evaluating and Loading Common Lisp Code from Shen
- How to Loading Shen Code from Common Lisp
Shen programs can convert from a Shen boolean to a CL boolean with shen-cl.true?.
(shen-cl.true? true)
T
(shen-cl.true? false)
NIL
CL booleans can be converted into Shen booleans with shen-cl.lisp-true?.
(shen-cl.lisp-true? NIL)
false
(shen-cl.lisp-true? [])
false
(shen-cl.lisp-true? 1)
true
Underlying Common Lisp functions can be qualified by prefixing them with lisp..
(lisp.sin 6.28)
-0.0031853017931379904
Common Lisp code can also be injected inline using the (lisp. "COMMON LISP SYNTAX") syntax. The lisp. form takes a single string as its argument. Also keep in mind that shen-cl puts Common Lisp into case-sensitive mode where CL functions and symbols are upper-case so they don't conflict with symbols defined for Shen.
(lisp. "(SIN 6.28)")
-0.0031853017931379904
(lisp. "(sin 6.28)")
The function COMMON-LISP-USER::sin is undefined.
Similarly to lisp., Common Lisp code can be used inline through shen-cl.eval-lisp, which evaluates the given string as a lisp form and returns the result. Code evaluated this way exists in the :COMMON-LISP-USER package (rather than :SHEN) and with the reader in case insensitive mode, so it is ideal for accessing external lisp code.
(shen-cl.eval-lisp "(defun cl-plus-one (x) (+ 1 x))")
CL-PLUS-ONE
(shen-cl.eval-lisp "(cl-plus-one 1)")
2
Common Lisp code can be loaded from external files with shen-cl.load-lisp:
(shen-cl.load-lisp "~/quicklisp/setup.lisp")
T
(shen-cl.eval-lisp "(ql:quickload :infix-math)")
To load "infix-math":
Load 1 ASDF system:
infix-math
; Loading "infix-math"
.
[INFIX-MATH]
(shen-cl.eval-lisp "(infix-math:$ 2 + 2)")
4
Like shen-cl.eval-lisp, shen-cl.load-lisp also operates in the :COMMON-LISP-USER package and case insensitive mode.
The function LOAD-SHEN is exported from the :SHEN-UTILS package which allows the loading of Shen files from Common Lisp code.
LOAD-SHEN will load Shen code into the :SHEN namespace in case-perserving mode, just like all other Shen code.