fib = fn: [n]
calc-fib = fn: [n a b]
if: (n == 0)
a
calc-fib: (n - 1) b (a + b)
calc-fib: n 0 1
print: fib: 10From the command line:
coffee syrup.coffee examples/fib.syrup
And for a REPL:
coffee syrup.coffee
Syrup is whitespace-significant. Function calls are made by a colon
following an atom. All subsequent arguments on a line are passed to the
function until a newline of the same indentation, the end of a parenthetical,
or a semicolon ;
print: "Cool language x" 5000 # Parses as (print "Cool language x" 5000)
print: # Equivalent
"Cool language x"
5000
print: square: 5; square: 6; # "25", "36"Parentheses are for disambiguation, and are insignificant. Commas are allowed, but not required.
calc-fib: (n - 1) b (a + b)
calc-fib: n - 1, b, a + bVector (array) syntax is like JavaScript's array literals. Vectors are not executed as functions.
[5 6 7 8] # equivalent to list: 5 6 7 8Quoting uses `.
print: `apples # prints "apples"Infix notation is supported for arithmetic operators and the assign operator:
5 + 6 # these two lines...
+: 5 6 # ...are equivalent
test = fn: [] print: 'hi' # declares the function 'test'Macros are supported:
unless = macro: [cond t f]
[`if cond f t]
print: unless: true "falsy" "truthy"Object literals can be defined using quoted strings or string variables as keys (as in python). Any arguments after the first passed to a string function have their properties copied to the new object literal. Finally, curly-braces combine all listed objects into one.
"a": 1 # JSON: {"a": 1}
key = "somekey"
key: "val" # JSON: {"somekey": "val"}
("some" + "key"): "val" # JSON: {"somekey": "val"}
obj = "b": 2 "c": 3 # parses to ("b" 2 ("c" 3)), equals {"b": 2, "c": 3}
obj2 = {"a": 1, obj} # parses to (combine ("a", 1) obj), equals {"a": 1, "b": 2, "c": 3}Syrup's loop struct helps mimic the benefits of tail-call optimization.
range = fn: [i]
loop: [i, r = []]
if: (i == 0) r
continue: (i - 1), concat: (i - 1), r
print: range: 5 # [0, 1, 2, 3, 4]- Lots more bikeshedding.
- Option to write Node.js scripts in syrup.
- Rewrite compiler in Syrup.
Syrup is released under the MIT License.
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