This is a simple Scheme interpreter that can parse and execute Scheme code. The interpreter is written in Python and uses a context-free grammar to parse the input code.
Below is a list of all the keywords and functions that are supported by this interpreter.
Note that val means "any IValue", and vals... either means zero-or-more or one-or-more.
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define: This is a special form that binds a symbol to a value. It is used to define variables and functions. -
if: This is a special form that evaluates a condition. If the condition is #t, it evaluates its first argument; otherwise, it evaluates its second argument. -
cond: This is a special form that evaluates a series of clauses. Each clause consists of a predicate and a body. If the predicate is #t, the body is evaluated; otherwise, the next clause is evaluated. -
lambda: This is a special form that defines a function. It takes a list of formal parameters and a body, and returns a function object that can be called with actual arguments. -
set!: This is a special form that modifies the value of a variable. It takes a symbol and a value as arguments, and sets the value of the symbol to the given value. -
begin: This is a special form that evaluates its arguments in order. It is used to group expressions together. -
quote: This is a special form that returns its argument unchanged. It is used to create literal values, such as lists and vectors. -
and: This is a special form that evaluates its arguments from left to right. It returns #t if all arguments are non-#f values, otherwise it returns #f. -
or: This is a special form that evaluates its arguments from left to right. It returns the first non-#f value it encounters, or #f if all arguments are #f.
(vector-length vec)(vector-get vec idx)(vector-set! vec idx val)(vector vals...)(zero or more values)(vector? val)(make-vector size)
(car cons-cell)(cdr cons-cell)(cons val1 val2)(list vals...)(zero or more values)(list? val)(set-car! cons val)(set-cdr! cons val)
(string-append str str)(string-length str)(substring str fromInc toExc)(fromInc and toExc are integers; first is inclusive, second is exclusive)(string? val)(string-ref str int)(string-equal? str str)(string chars...)(zero or more characters)
(+ number...)(one or more values)(- number...)(one or more values)(* number...)(one or more values)(/ number...)(one or more values)(% number...)(one or more values)(== number...)(one or more values)(> number...)(one or more values)(>= number...)(one or more values)(< number...)(one or more values)(<= number...)(one or more values)(abs number)(sqrt number)(acos number)(asin number)(atan number)(cos number)(cosh number)(sin number)(sinh number)(tan number)(tanh number)(integer? number)(double? number)(number? number)(symbol? number)(procedure? number)(log10 number)(loge number)(pow baseNum expNum)(not val)(integer->double int)(double->integer double)(null?)(and vals...)(one or more values)(or vals...)(one or more values)
pietauinf+inf-nan
- printing lists causes every element to be printed on its own line
- this interpreter is case sensitive.