Code coverage report for 6to5/lib/6to5/transformation/modules/system.js

Statements: 94.44% (85 / 90)      Branches: 72.22% (26 / 36)      Functions: 100% (15 / 15)      Lines: 94.32% (83 / 88)      Ignored: none     

All files » 6to5/lib/6to5/transformation/modules/ » system.js
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 1801   1 1 1 1 1 1   1 12 12   12     1   1 54 54     1 1 1   1       1   1       1     1 37 37     1 3     1 41 41 37   4       1 16 16     1 12 12   12   151 24 16 16 16         8     24         12       1 12   12 12 12   12   12               12 12   12     12   224   10     214 12         12   12 12 12   12 12           12                   12       12 9 9 9       12   212   212 6 6         12   12 12     12    
module.exports = SystemFormatter;
 
var AMDFormatter = require("./amd");
var useStrict    = require("../transformers/use-strict");
var traverse     = require("../../traverse");
var util         = require("../../util");
var t            = require("../../types");
var _            = require("lodash");
 
function SystemFormatter(file) {
  this.exportIdentifier  = file.generateUidIdentifier("export");
  this.noInteropRequire = true;
 
  AMDFormatter.apply(this, arguments);
}
 
util.inherits(SystemFormatter, AMDFormatter);
 
SystemFormatter.prototype._addImportSource = function (node, exportNode) {
  node._importSource = exportNode.source && exportNode.source.value;
  return node;
};
 
SystemFormatter.prototype._exportsWildcard = function (objectIdentifier, node) {
  var leftIdentifier = this.file.generateUidIdentifier("key");
  var valIdentifier  = t.memberExpression(objectIdentifier, leftIdentifier, true);
 
  var left = t.variableDeclaration("var", [
    t.variableDeclarator(leftIdentifier)
  ]);
 
  var right = objectIdentifier;
 
  var block = t.blockStatement([
    t.expressionStatement(this.buildExportCall(leftIdentifier, valIdentifier))
  ]);
 
  return this._addImportSource(t.forInStatement(left, right, block), node);
};
 
SystemFormatter.prototype._exportsAssign = function (id, init, node) {
  var call = this.buildExportCall(t.literal(id.name), init, true);
  return this._addImportSource(call, node);
};
 
SystemFormatter.prototype.remapExportAssignment = function (node) {
  return this.buildExportCall(t.literal(node.left.name), node);
};
 
SystemFormatter.prototype.buildExportCall = function (id, init, isStatement) {
  var call = t.callExpression(this.exportIdentifier, [id, init]);
  if (isStatement) {
    return t.expressionStatement(call);
  } else {
    return call;
  }
};
 
SystemFormatter.prototype.importSpecifier = function (specifier, node, nodes) {
  AMDFormatter.prototype.importSpecifier.apply(this, arguments);
  this._addImportSource(_.last(nodes), node);
};
 
SystemFormatter.prototype.buildRunnerSetters = function (block, hoistDeclarators) {
  return t.arrayExpression(_.map(this.ids, function (uid, source) {
    var nodes = [];
 
    traverse(block, {
      enter: function (node) {
        if (node._importSource === source) {
          if (t.isVariableDeclaration(node)) {
            _.each(node.declarations, function (declar) {
              hoistDeclarators.push(t.variableDeclarator(declar.id));
              nodes.push(t.expressionStatement(
                t.assignmentExpression("=", declar.id, declar.init)
              ));
            });
          } else {
            nodes.push(node);
          }
 
          this.remove();
        }
      }
    });
 
    return t.functionExpression(null, [uid], t.blockStatement(nodes));
  }));
};
 
SystemFormatter.prototype.transform = function (ast) {
  var program = ast.program;
 
  var hoistDeclarators = [];
  var moduleName = this.getModuleName();
  var moduleNameLiteral = t.literal(moduleName);
 
  var block = t.blockStatement(program.body);
 
  var runner = util.template("system", {
    MODULE_NAME: moduleNameLiteral,
    MODULE_DEPENDENCIES: t.arrayExpression(this.buildDependencyLiterals()),
    EXPORT_IDENTIFIER: this.exportIdentifier,
    SETTERS: this.buildRunnerSetters(block, hoistDeclarators),
    EXECUTE: t.functionExpression(null, [], block)
  }, true);
 
  var handlerBody = runner.expression.arguments[2].body.body;
  Eif (!moduleName) runner.expression.arguments.shift();
 
  var returnStatement = handlerBody.pop();
 
  // hoist up all variable declarations
  traverse(block, {
    enter: function (node, parent, scope) {
      if (t.isFunction(node)) {
        // nothing inside is accessible
        return this.skip();
      }
 
      if (t.isVariableDeclaration(node)) {
        Iif (node.kind !== "var" && !t.isProgram(parent)) { // let, const
          // can't be accessed
          return;
        }
 
        var nodes = [];
 
        _.each(node.declarations, function (declar) {
          hoistDeclarators.push(t.variableDeclarator(declar.id));
          Eif (declar.init) {
            // no initializer so we can just hoist it as-is
            var assign = t.expressionStatement(t.assignmentExpression("=", declar.id, declar.init));
            nodes.push(assign);
          }
        });
 
        // for (var i in test)
        // for (var i = 0;;)
        Iif (t.isFor(parent)) {
          if (parent.left === node) {
            return node.declarations[0].id;
          }
 
          if (parent.init === node) {
            return t.toSequenceExpression(nodes, scope);
          }
        }
 
        return nodes;
      }
    }
  });
  if (hoistDeclarators.length) {
    var hoistDeclar = t.variableDeclaration("var", hoistDeclarators);
    hoistDeclar._blockHoist = true;
    handlerBody.unshift(hoistDeclar);
  }
 
  // hoist up function declarations for circular references
  traverse(block, {
    enter: function (node) {
      if (t.isFunction(node)) this.skip();
 
      if (t.isFunctionDeclaration(node) || node._blockHoist) {
        handlerBody.push(node);
        this.remove();
      }
    }
  });
 
  handlerBody.push(returnStatement);
 
  Eif (useStrict._has(block)) {
    handlerBody.unshift(block.body.shift());
  }
 
  program.body = [runner];
};