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cjs_steal.js
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cjs_steal.js
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var esprima = require('esprima'),
traverse = require('./traverse'),
comparify = require('comparify'),
getAst = require("./get_ast"),
estraverse = require("estraverse");
function toVariableName(moduleName){
return "__"+moduleName.replace(/[^\w]/g,"_")
}
function isRequire(obj){
return comparify(obj, {
"type": "CallExpression",
"callee": {
"type": "Identifier",
"name": "require"
}
});
}
module.exports = function(load){
var moduleNameToVariables = {};
var ast = getAst(load);
traverse(ast, function(obj){
var moduleName;
var variableName;
if( isRequire(obj) &&
obj.arguments.length && obj.arguments[0].type === "Literal" ) {
moduleName = obj.arguments[0].value;
variableName = toVariableName(moduleName);
moduleNameToVariables[moduleName] = variableName;
obj.type = "Identifier";
obj.name = variableName;
delete obj.arguments;
delete obj.callee;
}
else if(
comparify(obj,
{
type: "MemberExpression",
object: {
type: "CallExpression",
callee: {
type: "Identifier",
name: "require"
}
}
}) &&
obj.object.arguments[0].type === "Literal"
) {
moduleName = obj.object.arguments[0].value;
variableName = toVariableName(moduleName);
moduleNameToVariables[moduleName] = variableName;
obj.object = {name: variableName, type: "Identifier"};
} else if(
comparify(obj,
{
type: "ExpressionStatement",
"expression": {
"type": "AssignmentExpression",
"operator": "=",
"left": {
"type": "MemberExpression",
"computed": false,
"object": {
"type": "Identifier",
"name": "module"
},
"property": {
"type": "Identifier",
"name": "exports"
}
},
"right": {
"type": "ObjectExpression"
}
}
})
) {
var objExpression = obj.expression.right;
delete obj.expression;
obj.type = "ReturnStatement";
obj.argument = objExpression;
}
});
var moduleNames = [],
variableNames = [];
for(var moduleName in moduleNameToVariables) {
moduleNames.push(moduleName);
variableNames.push(moduleNameToVariables[moduleName]);
}
var newAst = stealInsert(moduleNames, variableNames, ast.body);
return newAst;
};
function stealInsert(deps, vars, body) {
var depString = deps.join("','");
var varString = vars.join(",");
var code = "steal('" + depString + "', function(" +
varString + "){\n" + "\n});";
var ast = esprima.parse(code);
var astBody = body || [];
var isFunction;
estraverse.traverse(ast, {
enter: function(node) {
if(node.type === "FunctionExpression") {
isFunction = true;
}
if(isFunction && node.type === "BlockStatement") {
astBody.forEach(function(part){
node.body.push(part);
});
this.break();
}
}
});
return ast;
}