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interpreter.js
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interpreter.js
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#!/usr/bin/env node
var puts = require("sys").puts;
var print = require("sys").print;
var fs = require("fs");
var parser = require("./parser").parser();
var stdin = process.openStdin();
stdin.setEncoding('utf8');
var stack = [];
var buffer = "";
var createWord = function (ast) {
words[ast.word.value] = function(stack) {
eval(ast.body);
}
};
var createArray = function (v) {
return parser.parse("{"+v.join(" ")+"}")[0];
};
var createString = function (v) {
return parser.parse("\""+v+"\"")[0];
};
var createNumber = function (v) {
return parser.parse(v+"")[0];
};
var createBoolean = function (v) { // Runtime datatype, as opposed to parse-time
return {
type: "BOOLEAN",
show: v ? "t" : "f",
value: v
}
};
var pusher = function (v) {
if (typeof(v) == "number") stack.push(createNumber(v));
else if (typeof(v) == "string") stack.push(createString(v));
else if (typeof(v) == "boolean") stack.push(createBoolean(v));
else if (v.constructor.toString().indexOf("Array") != -1) stack.push(createArray(v));
else stack.push(v);
};
var eval = function (ast) { // Walk the AST
ast.forEach(function (val) {
if (val.type == "NUMBER") stack.push(val);
if (val.type == "STRING") stack.push(val);
if (val.type == "ARRAY") stack.push(val);
if (val.type == "QUOTE") stack.push(val);
try {
if (val.type == "WORD") if (val.value == "t") stack.push(createBoolean(true)); else if (val.value == "f") stack.push(createBoolean(false)); else words[val.value]();
} catch (err) {
puts("\033[33m"+val.value + "\033[31m not defined (or incorrect stack params)!\033[36m Try ( : "+val.value+" | <body> ; )");
puts("\033[m");
}
if (val.type == "DEFINITION") {
createWord(val);
puts("\033[32mDefined word: \033[1;32m"+val.word.value+"\033[m");
}
});
}
if (process.argv[2]) { // File input
fs.readFile(process.argv[2], function (err, data) {
eval(parser.parse(data.toString()));
puts("----------------Stack-------------------");
stack.forEach(function (v) {puts(v.show);});
puts("--------------End Stack----------------");
process.exit();
});
} else { // Standard input
puts("Welcome to the\033[1;33m pm\033[m interpreter.\nctrl-c to quit.");
stdin.on('data', function(data) {
if (data.match(/\n/)) {
var line = buffer + data.substr(0,data.indexOf("\n"));
eval(parser.parse(line));
puts("----------------Stack-------------------");
stack.forEach(function (v) {puts(v.show);});
puts("--------------End Stack----------------");
puts("\n");
} else buffer += data;
});
}
// -------------------------------- Core Library -------------------------------- \\
words = {
"+": function () {
operands = []
operands.push(stack.pop());
operands.push(stack.pop());
pusher(operands[1].value + operands[0].value);
},
"-": function () {
operands = []
operands.push(stack.pop());
operands.push(stack.pop());
pusher(operands[1].value - operands[0].value);
},
"*": function () {
operands = []
operands.push(stack.pop());
operands.push(stack.pop());
pusher(operands[1].value * operands[0].value);
},
"/": function () {
operands = []
operands.push(stack.pop());
operands.push(stack.pop());
pusher(operands[1].value / operands[0].value);
},
"^": function () {
operands = []
operands.push(stack.pop());
operands.push(stack.pop());
pusher(Math.pow(operands[1].value,operands[0].value));
},
".": function () {
puts(stack.pop().show);
},
"print": function () {
var val = stack.pop();
print(val.show);
pusher(val);
},
"println": function () {
var val = stack.pop();
puts(val.show);
pusher(val);
},
"dup": function () {
var val = stack.pop();
pusher(val);
pusher(val);
},
"drop": function () {
stack.pop();
},
"nip": function () {
stack.splice(stack.length-2,1);
},
"over": function () {
pusher(stack[stack.length-2]);
},
"swap": function () {
var top = stack[stack.length-1];
stack[stack.length-1] = stack[stack.length-2];
stack[stack.length-2] = top;
},
"call": function () {
var quote = stack.pop();
eval(quote.value);
},
"and": function () {
var operands = [];
operands.push(stack.pop());
operands.push(stack.pop());
operands[1].value && operands[0].value ? pusher(true) : pusher(false);
},
"or": function () {
var operands = [];
operands.push(stack.pop());
operands.push(stack.pop());
operands[1].value || operands[0].value ? pusher(true) : pusher(false);
},
"=": function () {
var operands = [];
operands.push(stack.pop());
operands.push(stack.pop());
operands[1].value == operands[0].value ? pusher(true) : pusher(false);
},
"<": function () {
var operands = [];
operands.push(stack.pop());
operands.push(stack.pop());
operands[1].value < operands[0].value ? pusher(true) : pusher(false);
},
">": function () {
var operands = [];
operands.push(stack.pop());
operands.push(stack.pop());
operands[1].value > operands[0].value ? pusher(true) : pusher(false);
},
"<=": function () {
var operands = [];
operands.push(stack.pop());
operands.push(stack.pop());
operands[1].value <= operands[0].value ? pusher(true) : pusher(false);
},
">=": function () {
var operands = [];
operands.push(stack.pop());
operands.push(stack.pop());
operands[1].value >= operands[0].value ? pusher(true) : pusher(false);
},
"if": function () {
var f = stack.pop();
var t = stack.pop();
var cond = stack.pop();
cond.value ? eval(t.value) : eval(f.value);
},
"length": function () {
var item = stack.pop();
pusher(item.value.length);
},
"range": function () {
var to = stack.pop().value;
var from = stack.pop().value;
var array = [];
if (to > from) for(var i = from; i <= to; i++) array.push(i);
else for(var i = from; i >= to; i--) array.push(i);
pusher(array);
},
"each": function () {
var quote = stack.pop();
var array = stack.pop();
array.value.forEach(function (v) {
pusher(v);
eval(quote.value);
});
},
"map": function () {
var quote = stack.pop();
var array = stack.pop();
var aux = [];
array.value.forEach(function (v) {
pusher(v);
eval(quote.value);
aux.push(stack.pop().value);
});
pusher(aux);
},
"reduce": function () {
var quote = stack.pop();
var init = stack.pop();
var array = stack.pop();
pusher(init.value);
array.value.forEach(function (v) {
pusher(v.value);
eval(quote.value);
});
},
"reverse": function () {
var val = stack.pop()
if (val.type == "ARRAY") {
var items = [];
val.value.forEach(function(v) {
items.push(v.value)
});
pusher(items.reverse());
}
else if (val.type == "STRING") pusher(val.value.split('').reverse().join(''));
}
};