REPL usage - anssihalmeaho/funl GitHub Wiki

Using REPL

FunL REPL is interactive shell which reads user inputs, evaluates those, prints result and continues this until user wants to quit.

REPL is started with -repl option:

./funla -repl

Welcome to FunL REPL (interactive command shell)
funl>

Evaluating expressions:

funl> plus(1 2 3)
6
funl>

There's help:

funl> help
Input can be:
  help         -> prints this help
  ?            -> prints this help
  quit         -> exits repl
  exit         -> exits repl
  <expression> -> evaluates expression and prints result

Adding < to end of line causes repl to gather more input before evaluation

funl>

Let definition in REPL

Using <symbol> = <expression> syntax cannot be used in REPL directly (as it's not expression).

Instead let -operator should be used for this purpose.

funl> let(x list(1 2 3))
list(1, 2, 3)
funl> x
list(1, 2, 3)
funl> len(x)
3
funl>

Importing modules in REPL

Importing modules cannot be done with import <module> syntax (as it's not expression).

Instead imp -operator should be used for this purpose.

funl> let(m imp(stdstr))
map('is-upper' : ext-proc, 'rstrip' : ext-proc, 'lowercase' : ext-proc, 'strip' : ext-proc, 'endswith' : ext-proc, 'is-digit' : ext-proc, 'join' : ext-proc, 'is-alpha' : ext-proc, 'is-space' : ext-proc, 'is-alnum' : ext-proc, 'is-lower' : ext-proc, 'replace' : ext-proc, 'uppercase' : ext-proc, 'startswith' : ext-proc, 'lstrip' : ext-proc)
funl>
funl> m
map('is-upper' : ext-proc, 'rstrip' : ext-proc, 'lowercase' : ext-proc, 'strip' : ext-proc, 'endswith' : ext-proc, 'is-digit' : ext-proc, 'join' : ext-proc, 'is-alpha' : ext-proc, 'is-space' : ext-proc, 'is-alnum' : ext-proc, 'is-lower' : ext-proc, 'replace' : ext-proc, 'uppercase' : ext-proc, 'startswith' : ext-proc, 'lstrip' : ext-proc)
funl>
funl> let(lowercase get(m 'lowercase'))
ext-proc
funl>
funl> call(lowercase 'AB cd')
ab cd
funl>
funl> keys(m)
list('is-upper', 'rstrip', 'lowercase', 'strip', 'endswith', 'is-digit', 'join', 'is-alpha', 'is-space', 'is-alnum', 'is-lower', 'replace', 'uppercase', 'startswith', 'lstrip')
funl>

Dividing expression to several lines

Adding "<" to end of line causes repl to gather more input before evaluation.

funl>
funl> let(p <
funl>... proc() <
funl>... 'ok' <
funl>... end)
func-value: file:  line: 1 pos: 11
funl>
funl> call(p)
ok
funl>
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