Package com.google.javascript.jscomp
Class Es6RewriteModules
- java.lang.Object
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- com.google.javascript.jscomp.Es6RewriteModules
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- All Implemented Interfaces:
CompilerPass
,HotSwapCompilerPass
,NodeTraversal.Callback
public final class Es6RewriteModules extends java.lang.Object implements HotSwapCompilerPass, NodeTraversal.Callback
Rewrites a ES6 module into a form that can be safely concatenated. Note that we treat a file as an ES6 module if it has at least one import or export statement.Also rewrites any goog.{require,requireType,forwardDeclare,goog.module.get} calls that are either in an ES module or of an ES module using goog.declareModuleId.
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description void
hotSwapScript(Node scriptNode, Node originalRoot)
Process the JS with root node root.static boolean
isEs6ModuleRoot(Node scriptNode)
Return whether or not the given script node represents an ES6 module file.void
process(Node externs, Node root)
Process the JS with root node root.boolean
shouldTraverse(NodeTraversal nodeTraversal, Node n, Node parent)
Visits a node in preorder (before its children) and decides whether its children should be traversed.void
visit(NodeTraversal t, Node n, Node parent)
Visits a node in postorder (after its children).
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Method Detail
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isEs6ModuleRoot
public static boolean isEs6ModuleRoot(Node scriptNode)
Return whether or not the given script node represents an ES6 module file.
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process
public void process(Node externs, Node root)
Description copied from interface:CompilerPass
Process the JS with root node root. Can modify the contents of each Node tree- Specified by:
process
in interfaceCompilerPass
- Parameters:
externs
- Top of external JS treeroot
- Top of JS tree
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hotSwapScript
public void hotSwapScript(Node scriptNode, Node originalRoot)
Description copied from interface:HotSwapCompilerPass
Process the JS with root node root. This is supposed to be significantly faster compared to corresponding full-compiler passes.- Specified by:
hotSwapScript
in interfaceHotSwapCompilerPass
- Parameters:
scriptNode
- Root node corresponding to the file that is modified, should be of typeToken.SCRIPT
.originalRoot
- Root node corresponding to the original version of the file that is modified. Should be of typetoken.SCRIPT
.
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shouldTraverse
public boolean shouldTraverse(NodeTraversal nodeTraversal, Node n, Node parent)
Description copied from interface:NodeTraversal.Callback
Visits a node in preorder (before its children) and decides whether its children should be traversed. If the children should be traversed, they will be visited byNodeTraversal.Callback.shouldTraverse(NodeTraversal, Node, Node)
in preorder and byNodeTraversal.Callback.visit(NodeTraversal, Node, Node)
in postorder.Siblings are always visited left-to-right.
Implementations can have side-effects (e.g. modify the parse tree). Removing the current node is legal, but removing or reordering nodes above the current node may cause nodes to be visited twice or not at all.
- Specified by:
shouldTraverse
in interfaceNodeTraversal.Callback
- Parameters:
nodeTraversal
- The current traversal.n
- The current node.parent
- The parent of the current node.- Returns:
- whether the children of this node should be visited
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visit
public void visit(NodeTraversal t, Node n, Node parent)
Description copied from interface:NodeTraversal.Callback
Visits a node in postorder (after its children). A node is visited in postorder iffNodeTraversal.Callback.shouldTraverse(NodeTraversal, Node, Node)
returned true for its parent. In particular, the root node is never visited in postorder.Siblings are always visited left-to-right.
Implementations can have side-effects (e.g. modify the parse tree). Removing the current node is legal, but removing or reordering nodes above the current node may cause nodes to be visited twice or not at all.
- Specified by:
visit
in interfaceNodeTraversal.Callback
- Parameters:
t
- The current traversal.n
- The current node.parent
- The parent of the current node.
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