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loosp.js
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loosp.js
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function require() {
var args = Array.prototype.slice.call(arguments);
var translate = args[0] != false;
if (!translate)
args.shift();
for (var i = 0; i < args.length; ++i) {
var request = new XMLHttpRequest();
request.open("GET", args[i] + ".js", false);
request.send();
var script = request.responseText;
if (translate)
script = "// Loosp translate code: " + args[i] + "\n" + loosp2js(false, true, script);
var elm = document.createElement("script");
elm.type = "text/javascript";
elm.src = "data:text/javascript;base64," + btoa(script);
document.head.appendChild(elm);
}
}
var loosp2js = (function () {
"use strict";
function loosp2js(showScript, excludeHeader, script) {
if (script) {
return translate(script, excludeHeader);
}
else {
var arr = document.querySelectorAll("script[type='text/loosp']");
for (var i = 0; i < arr.length; ++i) {
var script = "";
if ("src" in arr[i]
&& arr[i].src
&& arr[i].src.length > 0) {
var request = new XMLHttpRequest();
request.open("GET", arr[i].src, false);
request.send();
script = request.responseText;
}
else {
script = arr[i].innerHTML;
}
if (script) {
script = loosp2js(showScript, excludeHeader, script);
if (showScript)
console.log(script);
var elm = document.createElement("script");
elm.type = "text/javascript";
elm.src = "data:text/javascript;base64," + btoa(script);
document.head.appendChild(elm);
}
}
}
}
function translate(script, excludeHeader) {
var formName, good = true,
header = !excludeHeader ? "(class (LoospObject) (set! this.typeChain [\"LoospObject\"]) (method (getType) this.typeChain[0]))\n " : "",
program = { script: [header + script.trim()] };
for (var formName in grammar) {
program[formName] = [];
grammar[formName].name = formName;
}
for (var formName in grammar)
if (good)
good = processForm(program, grammar[formName]);
for (var formName in postProcess)
if (good)
good = processForm(program, postProcess[formName]);
return good ? program.script[0] : "console.error(\"Translation cancelled\");";
}
function processForm(program, form) {
var expr, matches, tokens, expr2, good = true, todo = [].concat(form.on), on;
for (var j = 0; j < todo.length; ++j) {
on = program[todo[j]];
for (var i = 0, l = on.length; i < l; ++i) {
expr = on[i];
do {
on[i] = expr;
if (todo[j] == "array" && form.name == "sexpr")
console.log(expr);
matches = expr.match(form.pattern);
if (matches) {
tokens = expr.split(/\s+/);
expr2 = expr.replace(
form.pattern,
form.translate.bind(form, program, tokens));
if (expr2 != expr)
expr = expr2
}
} while (expr != on[i])
}
if (form.validate) {
for (var i = 0; i < on.length; ++i) {
on[i] = on[i].replace(form.validate, function (match) {
good = false;
return "\n<err>>>> " + match + " <<<<err>\n";
});
}
if (!good) {
for (var i = 0; i < program.sexpr.length; ++i)
program.sexpr[i] = "(" + program.sexpr[i] + ")";
processForm(program, postProcess.compile);
console.error("Error: %s in: %s", form.errorMessage, program.script[0]);
}
}
}
return good;
}
function makeExpr(program, type, script) {
var i = program[type].indexOf(script);
if (i == -1) {
i = program[type].length;
program[type].push(script);
}
return "#" + type + i + "#";
}
var grammar = {
comments: {
on: "script",
pattern: /(\/\/[^\n]*\n|\/\*(.|\n)*\*\/)/g,
translate: function (program, tokens, match) {
return makeExpr(program, "comments", match);
},
validate: /(\/\*|\*\/)/g,
errorMessage: "unterminated block comment"
},
literal: {
on: "script",
pattern: /("[^"]*"|\b\d+\.\d+\b|\b\d+\b)/g,
translate: function (program, tokens, match) {
if (match[0] == "\"")
match = match.replace(/(\n|\r\n|\r)/g, "\\n\"$1+\"");
return makeExpr(program, "literal", match);
},
validate: /("[^"]*\n)/g,
errorMessage: "unterminated string constant"
},
sexpr: {
on: "script",
pattern: /\(([^\(\)])*\)/g,
translate: function (program, tokens, match) {
return makeExpr(program, "sexpr",
match.replace(/(\(|\))/g, ""));
},
validate: /(\(|\))/g,
errorMessage: "un-matched parenthesis"
},
array: {
on: ["script", "sexpr"],
pattern: /\[([^\[\]]*)\]/g,
translate: function (program, tokens, match) {
return makeExpr(program, "array",
"[" + match.substring(1, match.length - 1)
.split(/\s+/)
.map(function (s) { return s.trim(); })
.filter(function (s) { return s.length > 0; })
.join(",") + "]");
},
validate: /(\[|\])/g,
errorMessage: "unterminated array literal"
},
objectLiteral: {
on: ["script", "array", "sexpr"],
pattern: /{([^{}]*)}/g,
translate: function (program, tokens, match, capture1) {
capture1 = capture1.replace(/\s*:\s*/g, ":");
var pairs = capture1.trim().split(/\s+/);
return makeExpr(program, "objectLiteral", "{" + pairs.join(',') + "}");
},
validate: /({|})/g,
errorMessage: "unterminated object literal"
},
idsA: {
on: "sexpr",
pattern: /(\b\S+(-+\S*)+\b)/g,
translate: function (program, tokens, match) {
return match.replace(/-/g, "_");
}
},
idsB: {
on: "sexpr",
pattern: /\?/g,
translate: function (program, tokens, match) {
return match.replace(/\?/g, "Que");
}
},
operatorsA: {
on: "sexpr",
pattern: /^([+\-%^*\/><]|instanceof|in|>=|<=|!=|!==)(\s+\S+){2,}$/,
translate: function (program, tokens, match) {
var op = tokens.shift();
return makeExpr(program, "operatorsA",
"(" + tokens.join(" " + op + " ") + ")");
}
},
operatorsB: {
on: "sexpr",
pattern: /^(and|or|=)(\s+\S+){2,}$/,
translate: function (program, tokens, match) {
var op = tokens.shift();
if (op == "and") op = "&";
else if (op == "or") op = "|";
return makeExpr(program, "operatorsB",
"(" + tokens.join(op + op) + ")");
}
},
operatorsC: {
on: "sexpr",
pattern: /^(not|-|~)\s+\S+$/,
translate: function (program, tokens, match) {
var op = tokens.shift();
if (op == "not") op = "!";
var expr = tokens.shift();
return makeExpr(program, "operatorsC",
op + "(" + expr + ")");
}
},
func: {
on: "sexpr",
pattern: /^define\s+(#sexpr\d+#)((?:\s+[^\s\(\)]+)+)$/,
translate: makeFunction.bind(this, "func")
},
//this needs to come after func, as it is a more generalized pattern
// and can break function definitions if it came first. Alternately,
// we could change the 'define' keyword for functions.
variable: {
on: "sexpr",
pattern: /^define(\s+[^\s\(\)]+){2}$/,
translate: function (program, tokens, match) {
tokens.shift(); //discard "define"
return makeExpr(program, "variable", "var " + tokens.shift() + " = " + tokens.shift() + ";\n");
}
},
begin: {
on: "sexpr",
pattern: /^begin(\s+\S+)+$/,
translate: function (program, tokens, match) {
tokens.shift(); // discard "begin"
var body = tokens.join(" ");
return makeExpr(program, "sexpr", "let " + makeExpr(program, "sexpr", "") + " " + body);
}
},
letExpr: {
on: "sexpr",
pattern: /^let\s+#sexpr(\d+)#\s+(\S+)$/,
translate: function (program, tokens, match, argsSexprID, body) {
var args = program.sexpr[argsSexprID]
.replace(/(#sexpr|#)/g, "")
.split(/\s+/)
.map(function (m) {
return program.sexpr[m].split(/\s+/);
});
var vals = args.map(function (m) { return m[1]; });
args = args.map(function (m) { return m[0]; });
var parts = body.split(/\s+/);
var tail = parts.pop();
parts.push("return " + tail);
body = parts.join(" ");
return makeExpr(program, "letExpr", "(function(" + args.join(",")
+"){"+body+"}).call(this, "+vals.join(",")+")");
}
},
whileLoop: {
on: "sexpr",
pattern: /^while\s+\S+(\s+\S+)+$/,
translate: function (program, tokens, match) {
tokens.shift(); // discard "while"
var cond = tokens.shift();
var body = tokens.join(";\n ");
var script = "while(" + cond + "){\n" + body + ";\n}\n";
return makeExpr(program, "whileLoop", script);
}
},
when: {
on: "sexpr",
pattern: /^when\s+[^\s\(\)]+(\s+[^\s\(\)]+)+$/,
translate: function (program, tokens, match) {
tokens.shift(); // discard "when"
var expr = tokens.shift();
var tail = tokens.pop();
tokens.push("_ret = " + tail);
var body = tokens.join(";\n ");
return makeExpr(program, "when", "(function(){\nvar _ret; if(" + expr + "){\n" + body + ";\n}\n return _ret;\n}).call(this)");
}
},
ifBlock: {
on: "sexpr",
pattern: /^if\s+[^\s\(\)]+(\s+#sexpr\d+#){2}$/,
translate: function (program, tokens, match) {
tokens.shift(); // discard "if"
var expr = tokens.shift();
var yes = tokens.shift();
var no = tokens.shift();
return makeExpr(program, "ifBlock", "(function(){\nvar _ret;\n if(" + expr + "){\n_ret = " + yes + ";\n}\nelse{\n_ret = " + no + ";\n}\n return _ret;\n}).call(this)");
}
},
unless: {
on: "sexpr",
pattern: /^unless\s+[^\s\(\)]+(\s+[^\s\(\)]+)+$/,
translate: function (program, tokens, match) {
tokens.shift(); // discard "unless"
var expr = tokens.shift();
var tail = tokens.pop();
tokens.push("_ret = " + tail);
var body = tokens.join(";\n ");
return makeExpr(program, "unless", "(function(){\nvar _ret;\n if(!" + expr + "){\n" + body + ";\n}\n return _ret;\n}).call(this)");
}
},
lambda: {
on: "sexpr",
pattern: /^lambda\s+#sexpr\d+#(\s+[^\s\(\)]+)+$/,
translate: makeFunction.bind(this, "lambda")
},
class: {
on: "sexpr",
pattern: /^class\s+#sexpr\d+#(\s+[^\s\(\)]+)+$/,
translate: makeFunction.bind(this, "class")
},
method: {
on: "sexpr",
pattern: /^method\s+#sexpr\d+#(\s+[^\s\(\)]+)+$/,
translate: makeFunction.bind(this, "method")
},
handler: {
on: "sexpr",
pattern: /^on\s+\S+:\S+\s+\S+$/,
translate: function (program, tokens) {
tokens.shift(); //discard "on"
var target = tokens.shift();
var parts = target.split(":");
target = parts.shift();
var evt = parts.shift();
var body = tokens.join(" ");
return makeExpr(program, "handler", target + ".addEventListener(\"" + evt + "\", " + body + ", false);");
}
},
send: {
on: "sexpr",
pattern: /^send(\s+[^\s\(\)]+){2,}$/,
translate: function (program, tokens) {
tokens.shift(); //discard "send"
var target = tokens.shift();
var func = tokens.shift();
var args = tokens.join(",");
return makeExpr(program, "send", "((!!" + target + ")?(" + target + "." + func + "(" + args + ")):(undefined))");
}
},
newObject: {
on: "sexpr",
pattern: /^new(\s+[^\s\(\)]+)+$/,
translate: function (program, tokens) {
tokens.shift(); //discard "new"
var func = tokens.shift();
var args = tokens.join(",");
return makeExpr(program, "newObject", "new " + func + "(" + args + ")");
}
},
setter: {
on: "sexpr",
pattern: /^set!(\s+[^\s\(\)]+){2}$/,
translate: function (program, tokens) {
tokens.shift(); //discard "set!"
return makeExpr(program, "setter", tokens.shift() + " = " + tokens.shift() + ";\n");
}
},
forLoop:{
on: "sexpr",
pattern: /for\s+#sexpr(\d+)#(\s+\S+)*/,
translate: function (program, tokens, match, sexprNum) {
tokens.shift();
tokens.shift();
var expr = program.sexpr[sexprNum];
return makeExpr(program, "forLoop", "for(" + expr + "){" + tokens.join(";") + "}");
}
},
// at this point, just going to assume any left-over s-expressions
// are function calls.
call: {
on: "sexpr",
pattern: /^(\s*\S+)+$/g,
translate: function (program, tokens, match) {
if (tokens.length == 1 && tokens[0].match(/^#[^#\s]+\d+#$/))
return tokens[0];
else {
var func = tokens.shift();
var args = tokens.join(",");
return makeExpr(program, "call", func + "(" + args + ")");
}
}
},
};
var postProcess = {
compile: {
on: "script",
pattern: /#([^\s\d]+)(\d+)#/,
translate: function (program, tokens, match) {
var matches = match.match(this.pattern);
var type = matches[1];
var index = matches[2];
return program[type][index];
}
},
cleanupA: {
on: "script",
pattern: /(;;)/g,
translate: function (program, tokens, match) {
return ";"
}
},
cleanupB: {
// this will end up replacing all semicolons on their own line,
// including any that are in the middle of verbatim strings.
on: "script",
pattern: /^\s*;\s*$/gm,
translate: function (program, tokens, match) {
return ""
}
},
}
function makeFunction(type, program, tokens, match) {
tokens.shift(); // discard keyword
var signature = postProcess.compile.translate(program, null, tokens.shift());
var args = signature.split(/\s+/);
var name = "";
var super1 = "", super2 = "", matches;
if (type != "lambda")
name = args.shift();
if (type != "class") {
var tail = tokens.pop();
if (tail)
tokens.push("return " + tail);
}
else {
// figure out super types
if (name != "LoospObject") {
if (name.indexOf(":") > -1) {
var parts = name.split(":");
name = parts.shift();
super1 = parts.shift();
}
else {
super1 = "LoospObject";
}
super2 = name + ".prototype = Object.create(" + super1 + ".prototype);";
if (super1 == "LoospObject") {
super1 = "LoospObject.call(this);\n";
super1 += " this.typeChain.unshift(\"" + name + "\");\n";
}
else {
super1 = "var base = function(){\n" + super1 + ".apply(this, Array.prototype.slice.call(arguments));\n";
super1 += " this.typeChain.unshift(\"" + name + "\");\n}.bind(this);\n";
}
}
// move method definitions out of class body
var exprs = [], methods = [];
tokens.forEach(function (exprID) {
var expr = postProcess.compile.translate(program, null, exprID);
if (expr.search(/^method /) > -1)
methods.push(name + "." + exprID);
else
exprs.push(exprID);
});
tokens = exprs;
super2 += methods.join(";\n ") + ";\n ";
}
var prefix = "";
if (type == "method")
prefix = "prototype." + name + " = ";
//ellipsis
if (args.length > 0) {
matches = args[args.length - 1].match(/(\S+)\.\.\./);
if (matches) {
args.pop();
var argName = matches[1];
super1 += "var " + argName + " = Array.prototype.slice.call(arguments);\n " + argName + ".splice(0, " + args.length + ");\n";
}
}
return makeExpr(program, type,
prefix + "function " + name
+ "(" + args.join(",") + "){\n"
+ super1
+ tokens.join(";\n ") + ";\n }\n"
+ super2);
}
return loosp2js;
})();