compileProvider.\$get

this.\$get = ['\$injector', '\$parse', '\$controller', '\$rootScope', '\$http', '\$interpolate',
   function(\$injector, \$parse, \$controller, \$rootScope, \$http, \$interpolate) {
 ...
 return compile;
}

function compile(\$compileNodes, maxPriority) {
   var compositeLinkFn = compileNodes(\$compileNodes, maxPriority);

   return function publicLinkFn(scope, cloneAttachFn, options) {
    options = options || {};
    var parentBoundTranscludeFn = options.parentBoundTranscludeFn;
    var transcludeControllers = options.transcludeControllers;
    if (parentBoundTranscludeFn && parentBoundTranscludeFn.$$boundTransclude) {
     parentBoundTranscludeFn = parentBoundTranscludeFn.$$boundTransclude;
    }
    var $linkNodes;
    if (cloneAttachFn) {
     $linkNodes = $compileNodes.clone();
     cloneAttachFn($linkNodes, scope);
    } else {
     $linkNodes = $compileNodes;
    }
    _.forEach(transcludeControllers, function(controller, name) {
     $linkNodes.data('$' + name + 'Controller', controller.instance);
    });
    $linkNodes.data('$scope', scope);
    compositeLinkFn(scope, $linkNodes, parentBoundTranscludeFn);
    return $linkNodes;
   };
  }

function compileNodes($compileNodes, maxPriority) {
   var linkFns = [];
   _.times($compileNodes.length, function(i) {
    var attrs = new Attributes($($compileNodes[i]));
    var directives = collectDirectives($compileNodes[i], attrs, maxPriority);
    var nodeLinkFn;
    if (directives.length) {
     nodeLinkFn = applyDirectivesToNode(directives, $compileNodes[i], attrs);
    }
    var childLinkFn;
    if ((!nodeLinkFn || !nodeLinkFn.terminal) &&
      $compileNodes[i].childNodes && $compileNodes[i].childNodes.length) {
     childLinkFn = compileNodes($compileNodes[i].childNodes);
    }
    if (nodeLinkFn && nodeLinkFn.scope) {
     attrs.$$element.addClass('ng-scope');
    }
    if (nodeLinkFn || childLinkFn) {
     linkFns.push({
      nodeLinkFn: nodeLinkFn,
      childLinkFn: childLinkFn,
      idx: i
     });
    }
   });

   // 执行指令的链接函数
   function compositeLinkFn(scope, linkNodes, parentBoundTranscludeFn) {
    var stableNodeList = [];
    _.forEach(linkFns, function(linkFn) {
     var nodeIdx = linkFn.idx;
     stableNodeList[linkFn.idx] = linkNodes[linkFn.idx];
    });

    _.forEach(linkFns, function(linkFn) {
     var node = stableNodeList[linkFn.idx];
     if (linkFn.nodeLinkFn) {
      var childScope;
      if (linkFn.nodeLinkFn.scope) {
       childScope = scope.$new();
       $(node).data('$scope', childScope);
      } else {
       childScope = scope;
      }

      var boundTranscludeFn;
      if (linkFn.nodeLinkFn.transcludeOnThisElement) {
       boundTranscludeFn = function(transcludedScope, cloneAttachFn, transcludeControllers, containingScope) {
        if (!transcludedScope) {
         transcludedScope = scope.$new(false, containingScope);
        }
        var didTransclude = linkFn.nodeLinkFn.transclude(transcludedScope, cloneAttachFn, {
         transcludeControllers: transcludeControllers,
         parentBoundTranscludeFn: parentBoundTranscludeFn
        });
        if (didTransclude.length === 0 && parentBoundTranscludeFn) {
         didTransclude = parentBoundTranscludeFn(transcludedScope, cloneAttachFn);
        }
        return didTransclude;
       };
      } else if (parentBoundTranscludeFn) {
       boundTranscludeFn = parentBoundTranscludeFn;
      }

      linkFn.nodeLinkFn(
       linkFn.childLinkFn,
       childScope,
       node,
       boundTranscludeFn
      );
     } else {
      linkFn.childLinkFn(
       scope,
       node.childNodes,
       parentBoundTranscludeFn
      );
     }
    });
   }

   return compositeLinkFn;
  }

if (directive.transclude === 'element') {
      hasElementTranscludeDirective = true;
      var $originalCompileNode = $compileNode;
      $compileNode = attrs.$$element = $(document.createComment(' ' + directive.name + ': ' + attrs[directive.name] + ' '));
      $originalCompileNode.replaceWith($compileNode);
      terminalPriority = directive.priority;
      childTranscludeFn = compile($originalCompileNode, terminalPriority);
     } else {
      var $transcludedNodes = $compileNode.clone().contents();
      childTranscludeFn = compile($transcludedNodes);
      $compileNode.empty();
     }

_.forEach(preLinkFns, function(linkFn) {
     linkFn(
      linkFn.isolateScope ? isolateScope : scope,
      $element,
      attrs,
      linkFn.require && getControllers(linkFn.require, $element),
      scopeBoundTranscludeFn
     );
    });
    if (childLinkFn) {
     var scopeToChild = scope;
     if (newIsolateScopeDirective && newIsolateScopeDirective.template) {
      scopeToChild = isolateScope;
     }
     childLinkFn(scopeToChild, linkNode.childNodes, boundTranscludeFn);
    }
    _.forEachRight(postLinkFns, function(linkFn) {
     linkFn(
      linkFn.isolateScope ? isolateScope : scope,
      $element,
      attrs,
      linkFn.require && getControllers(linkFn.require, $element),
      scopeBoundTranscludeFn
     );
    });