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| var traverse = require("./traverse");
var recast = require("recast");
var path = require("path");
var fs = require("fs");
var _ = require("lodash");
var b = require("ast-types").builders;
exports.ensureBlock = function (node) {
var block = node.body;
Eif (block.type === "BlockStatement") return;
node.body = [node.body];
};
exports.isPattern = function (node) {
return node.type === "ArrayPattern" || node.type === "ObjectPattern";
};
exports.formatJSON = function (obj) {
return JSON.stringify(obj, null, " ");
};
exports.removeProperties = function (tree) {
var clear = function (node) {
delete node.tokens;
delete node.range;
delete node.loc;
};
clear(tree);
traverse(tree, clear);
return tree;
};
exports.errorWithNode = function (node, msg) {
var line = node.loc.start.line;
var col = node.loc.start.column;
var err = new SyntaxError("Line " + line + ": " + msg);
err.lineNumber = line;
err.column = col;
return err;
};
exports.camelCase = function (value) {
return value.replace(/[-_\s]+(.)?/g, function (match, c) {
return c ? c.toUpperCase() : "";
});
};
exports.canCompile = function (filename) {
var ext = path.extname(filename);
return ext === ".js" || ext === ".es6";
};
exports.buildUidGenerator = function () {
var ids = {};
return function (name) {
var i = ids[name] || 1;
var id = "_" + name;
if (i > 1) id += i;
ids[name] = i + 1;
return id;
};
};
exports.sourceMapToComment = function (map) {
var json = JSON.stringify(map);
var base64 = new Buffer(json).toString("base64");
return "//# sourceMappingURL=data:application/json;base64," + base64;
};
exports.pushMutatorMap = function (mutatorMap, key, kind, method) {
var map = mutatorMap[key] = mutatorMap[key] || {};
if (map[kind]) {
throw new Error("a " + kind + " already exists for this property");
} else {
map[kind] = method;
}
};
exports.buildDefineProperties = function (mutatorMap, keyNode) {
var objExpr = b.objectExpression([]);
_.each(mutatorMap, function (map, key) {
var mapNode = b.objectExpression([]);
var propNode = b.property("init", b.identifier(key), mapNode);
_.each(map, function (methodNode, type) {
methodNode = _.clone(methodNode);
if (methodNode.type === "MethodDefinition") methodNode = methodNode.value;
mapNode.properties.push(b.property("init", b.identifier(type), methodNode));
});
objExpr.properties.push(propNode);
});
return exports.template("object-define-properties", {
OBJECT: keyNode,
PROPS: objExpr
}, true);
};
exports.template = function (name, nodes, keepExpression) {
var template = exports.templates[name];
Iif (!template) throw new ReferenceError("unknown template " + name);
template = _.cloneDeep(template);
if (!_.isEmpty(nodes)) {
traverse(template, function (node) {
if (node.type === "Identifier" && _.has(nodes, node.name)) {
var newNode = nodes[node.name];
if (_.isString(newNode)) {
node.name = newNode;
} else {
return newNode;
}
}
});
}
var node = template.body[0];
if (!keepExpression && node.type === "ExpressionStatement") {
return node.expression;
} else {
return node;
}
};
exports.codeFrame = function (lines, lineNumber, colNumber) {
colNumber = Math.max(colNumber, 0);
lines = lines.split("\n");
var start = Math.max(lineNumber - 3, 0);
var end = Math.min(lines.length, lineNumber + 3);
var width = (end + "").length;
return "\n" + lines.slice(start, end).map(function (line, i) {
var curr = i + start + 1;
var gutter = curr === lineNumber ? "> " : " ";
var sep = curr + exports.repeat(width + 1);
gutter += sep + "| ";
var str = gutter + line;
if (colNumber && curr === lineNumber) {
str += "\n";
str += exports.repeat(gutter.length - 2);
str += "|" + exports.repeat(colNumber) + "^";
}
return str;
}).join("\n");
};
exports.repeat = function (width, cha) {
cha = cha || " ";
return new Array(width + 1).join(cha);
};
exports.generate = function (ast, opts) {
var printOpts = {};
if (opts.sourceMap) {
printOpts.sourceMapName = path.basename(opts.filename);
}
return recast.print(ast, printOpts);
};
exports.parse = function (filename, code, callback) {
try {
var ast = recast.parse(code, {
sourceFileName: path.basename(filename)
});
if (callback) {
return callback(ast);
} else {
return ast;
}
} catch (err) {
Eif (!err._6to5) {
err._6to5 = true;
err.message = filename + ": " + err.message;
Eif (err.lineNumber) {
var frame = exports.codeFrame(code, err.lineNumber, err.column);
err.message = err.message + frame;
}
}
throw err;
}
};
try {
exports.templates = require("../../templates.json");
} catch (err) {
Iif (err.code !== "MODULE_NOT_FOUND") throw err;
exports.templates = {};
var templatesLoc = __dirname + "/templates";
Iif (!fs.existsSync(templatesLoc)) {
throw new Error("no templates directory - this is most likely the result" +
" of a broken `npm publish`. Please report to " +
"https://github.com/sebmck/6to5/issues");
}
_.each(fs.readdirSync(templatesLoc), function (name) {
var key = path.basename(name, path.extname(name));
var loc = templatesLoc + "/" + name;
var code = fs.readFileSync(loc, "utf8");
exports.templates[key] = exports.removeProperties(exports.parse(loc, code).program);
});
}
|