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util.js
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util.js
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var estraverse = require("estraverse");
var traverse = require("./traverse");
var esprima = require("esprima");
var path = require("path");
var fs = require("fs");
var _ = require("lodash");
_.each(esprima.Syntax, function (name) {
estraverse.VisitorKeys[name] = estraverse.VisitorKeys[name] || [];
});
exports.parse = function (code, opts) {
opts = _.defaults(opts || {}, {
comment: true,
tokens: true,
range: true,
loc: true
});
code = [].concat(code).join("");
try {
var tree = esprima.parse(code, opts);
if (tree.tokens && tree.comments) {
estraverse.attachComments(tree, tree.comments, tree.tokens);
}
return tree;
} catch (err) {
if (err.lineNumber) {
var frame = exports.codeFrame(code, err.lineNumber, err.column);
err.message = err.message + frame;
}
throw err;
}
};
exports.errorWithNode = function (node, msg) {
var err = new Error(msg);
err.lineNumber = node.loc.start.line;
err.column = node.loc.start.column;
return err;
};
exports.canCompile = function (filename) {
return path.extname(filename) === ".js";
};
exports.buildUidGenerator = function () {
var ids = {};
return function (name) {
var i = ids[name] || 0;
var id = "_" + name;
if (i > 0) 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 = {
type: "ObjectExpression",
properties: []
};
_.each(mutatorMap, function (map, key) {
var mapNode = {
type: "ObjectExpression",
properties: []
};
var propNode = {
type: "Property",
key: {
type: "Identifier",
name: key
},
value: mapNode,
kind: "init"
};
_.each(map, function (methodNode, type) {
if (methodNode.type === "MethodDefinition") methodNode = methodNode.value;
mapNode.properties.push({
type: "Property",
key: {
type: "Identifier",
name: type
},
value: methodNode,
kind: "init"
});
});
objExpr.properties.push(propNode);
});
return exports.template("object-define-properties", {
OBJECT: keyNode,
PROPS: objExpr
}, true);
};
exports.template = function (name, nodes, keepExpression) {
var template = _.cloneDeep(exports.templates[name]);
if (!_.isEmpty(nodes)) {
traverse.replace(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 normaliseNode = function (node) {
if (!keepExpression && node.type === "ExpressionStatement") {
return node.expression;
} else {
return node;
}
};
var body = template.body;
if (body.length <= 1) {
return normaliseNode(body[0]);
} else {
return body.map(normaliseNode);
}
};
exports.codeFrame = function (lines, lineNumber, colNumber) {
if (!lineNumber) return "";
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);
};
var templatesCacheLoc = __dirname + "/../../templates.json";
if (fs.existsSync(templatesCacheLoc)) {
exports.templates = require(templatesCacheLoc);
} else {
exports.templates = {};
var templatesLoc = __dirname + "/templates";
_.each(fs.readdirSync(templatesLoc), function (name) {
var key = path.basename(name, path.extname(name));
var code = fs.readFileSync(templatesLoc + "/" + name, "utf8");
exports.templates[key] = exports.parse(code, {
comment: false,
tokens: false,
range: false,
loc: false
});
});
}