lambda-language

The lambda-language

---

Install

$ npm install lambda-language

Syntax

ref the example

API

The following are located in the corresponding file in src

• InputStream: output lex
• TokenStream: output token
• parser: output ast
• codeGen: complier the ast to JS
• Environment: store variables
• Environment.Execute: execute ast with guarding stack
• Environment.evalute: eval ast expression with an env

Run the language

$ bin/lambda demo

Compile the language to JS

$ bin/code-to-js demo2 [demo2.js]

Some examples about syntax

print_range = λ(a, b) if a <= b {
                        println(a);
                        if a + 1 <= b {
                          print_range(a + 1, b);
                        } 
                        else 
                          println("");
                      };
print_range(1, 10);

output:

1
2
3
4
5
6
7
8
9 
10

cons = λ(a, b) λ(f) f(a, b);
car = λ(cell) cell(λ(a, b) a);
cdr = λ(cell) cell(λ(a, b) b);
NIL = λ(f) f(NIL, NIL);

x = cons(1, cons(2, cons(3, cons(4, cons(5, NIL)))));
println(car(x));                      # 1
println(car(cdr(x)));                 # 2
println(car(cdr(cdr(x))));            # 3
println(car(cdr(cdr(cdr(x)))));       # 4
println(car(cdr(cdr(cdr(cdr(x))))));  # 5

output:

1
2
3
4
5

binded with some nodejs functions

code = fs-readFileSync("./demo");
println(code);
println(os-arch());