-
Notifications
You must be signed in to change notification settings - Fork 1.1k
/
PolymerPass.java
258 lines (226 loc) · 9.67 KB
/
PolymerPass.java
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
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
/*
* Copyright 2015 The Closure Compiler Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.javascript.jscomp;
import static com.google.common.base.MoreObjects.toStringHelper;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.javascript.jscomp.PolymerPassErrors.POLYMER_INVALID_EXTENDS;
import static com.google.javascript.jscomp.PolymerPassErrors.POLYMER_MISSING_EXTERNS;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.javascript.jscomp.NodeTraversal.ExternsSkippingCallback;
import com.google.javascript.jscomp.parsing.parser.FeatureSet.Feature;
import com.google.javascript.rhino.IR;
import com.google.javascript.rhino.JSDocInfo;
import com.google.javascript.rhino.JSDocInfoBuilder;
import com.google.javascript.rhino.JSTypeExpression;
import com.google.javascript.rhino.Node;
import com.google.javascript.rhino.Token;
import java.util.HashSet;
import java.util.Set;
/**
* Rewrites "Polymer({})" calls into a form that is suitable for type checking and dead code
* elimination. Also ensures proper format and types.
*
* <p>Only works with Polymer version 0.8 and above.
*
* <p>Design and examples: https://github.com/google/closure-compiler/wiki/Polymer-Pass
*
* @author jlklein@google.com (Jeremy Klein)
*/
final class PolymerPass extends ExternsSkippingCallback implements HotSwapCompilerPass {
private static final String VIRTUAL_FILE = "<PolymerPass.java>";
private final AbstractCompiler compiler;
private final ImmutableMap<String, String> tagNameMap;
private final int polymerVersion;
private final PolymerExportPolicy polymerExportPolicy;
private final boolean propertyRenamingEnabled;
private Node polymerElementExterns;
private Node externsInsertionRef = null;
private final Set<String> nativeExternsAdded;
private ImmutableList<Node> polymerElementProps;
private GlobalNamespace globalNames;
private boolean warnedPolymer1ExternsMissing = false;
private boolean propertySinkExternInjected = false;
PolymerPass(
AbstractCompiler compiler,
Integer polymerVersion,
PolymerExportPolicy polymerExportPolicy,
boolean propertyRenamingEnabled) {
checkArgument(
polymerVersion == null || polymerVersion == 1 || polymerVersion == 2,
"Invalid Polymer version:",
polymerVersion);
this.compiler = compiler;
tagNameMap = TagNameToType.getMap();
nativeExternsAdded = new HashSet<>();
this.polymerVersion = polymerVersion == null ? 1 : polymerVersion;
this.polymerExportPolicy =
polymerExportPolicy == null ? PolymerExportPolicy.LEGACY : polymerExportPolicy;
this.propertyRenamingEnabled = propertyRenamingEnabled;
}
@Override
public void process(Node externs, Node root) {
PolymerPassFindExterns externsCallback = new PolymerPassFindExterns();
NodeTraversal.traverse(compiler, externs, externsCallback);
polymerElementExterns = externsCallback.getPolymerElementExterns();
polymerElementProps = externsCallback.getPolymerElementProps();
if (polymerVersion == 1 && polymerElementExterns == null) {
this.warnedPolymer1ExternsMissing = true;
compiler.report(JSError.make(POLYMER_MISSING_EXTERNS));
return;
}
if (polymerVersion > 1 && propertyRenamingEnabled) {
compiler.ensureLibraryInjected("util/reflectobject", false);
}
globalNames = new GlobalNamespace(compiler, externs, root);
Node externsAndJsRoot = root.getParent();
hotSwapScript(externsAndJsRoot, null);
}
@Override
public void hotSwapScript(Node scriptRoot, Node originalRoot) {
NodeTraversal.traverse(compiler, scriptRoot, this);
PolymerPassSuppressBehaviors suppressBehaviorsCallback =
new PolymerPassSuppressBehaviors(compiler);
NodeTraversal.traverse(compiler, scriptRoot, suppressBehaviorsCallback);
}
@Override
public void visit(NodeTraversal traversal, Node node, Node parent) {
checkNotNull(globalNames, "Cannot call visit() before process()");
if (PolymerPassStaticUtils.isPolymerCall(node)) {
if (polymerElementExterns != null) {
rewritePolymer1ClassDefinition(node, parent, traversal);
} else if (!warnedPolymer1ExternsMissing) {
compiler.report(JSError.make(node, POLYMER_MISSING_EXTERNS));
warnedPolymer1ExternsMissing = true;
}
} else if (PolymerPassStaticUtils.isPolymerClass(node)) {
rewritePolymer2ClassDefinition(node, traversal);
}
}
/** Polymer 1.x and Polymer 2 Legacy Element Definitions */
private void rewritePolymer1ClassDefinition(Node node, Node parent, NodeTraversal traversal) {
Node grandparent = parent.getParent();
if (grandparent.isConst()) {
grandparent.setToken(Token.LET);
Node scriptNode = traversal.getCurrentScript();
if (scriptNode != null) {
NodeUtil.addFeatureToScript(scriptNode, Feature.LET_DECLARATIONS);
}
traversal.reportCodeChange();
}
PolymerClassDefinition def = PolymerClassDefinition.extractFromCallNode(
node, compiler, globalNames);
if (def != null) {
if (def.nativeBaseElement != null) {
appendPolymerElementExterns(def);
}
PolymerClassRewriter rewriter =
new PolymerClassRewriter(
compiler,
getExtensInsertionRef(),
polymerVersion,
polymerExportPolicy,
this.propertyRenamingEnabled);
if (NodeUtil.isNameDeclaration(grandparent) || parent.isAssign()) {
rewriter.rewritePolymerCall(grandparent, def, traversal.inGlobalScope());
} else {
rewriter.rewritePolymerCall(parent, def, traversal.inGlobalScope());
}
}
}
/** Polymer 2.x Class Nodes */
private void rewritePolymer2ClassDefinition(Node node, NodeTraversal traversal) {
PolymerClassDefinition def =
PolymerClassDefinition.extractFromClassNode(node, compiler, globalNames);
if (def != null) {
PolymerClassRewriter rewriter =
new PolymerClassRewriter(
compiler,
getExtensInsertionRef(),
polymerVersion,
polymerExportPolicy,
this.propertyRenamingEnabled);
rewriter.propertySinkExternInjected = propertySinkExternInjected;
rewriter.rewritePolymerClassDeclaration(node, traversal, def);
propertySinkExternInjected = rewriter.propertySinkExternInjected;
}
}
private Node getExtensInsertionRef() {
if (this.polymerElementExterns != null) {
return this.polymerElementExterns;
}
if (this.externsInsertionRef == null) {
this.externsInsertionRef = compiler.getSynthesizedExternsInputAtEnd().getAstRoot(compiler);
}
return this.externsInsertionRef;
}
/**
* Duplicates the PolymerElement externs with a different element base class if needed.
* For example, if the base class is HTMLInputElement, then a class PolymerInputElement will be
* added. If the element does not extend a native HTML element, this method is a no-op.
*/
private void appendPolymerElementExterns(final PolymerClassDefinition def) {
if (!nativeExternsAdded.add(def.nativeBaseElement)) {
return;
}
Node block = IR.block();
Node baseExterns = polymerElementExterns.cloneTree();
String polymerElementType = PolymerPassStaticUtils.getPolymerElementType(def);
baseExterns.getFirstChild().setString(polymerElementType);
String elementType = tagNameMap.get(def.nativeBaseElement);
if (elementType == null) {
compiler.report(JSError.make(def.descriptor, POLYMER_INVALID_EXTENDS, def.nativeBaseElement));
return;
}
JSTypeExpression elementBaseType =
new JSTypeExpression(new Node(Token.BANG, IR.string(elementType)), VIRTUAL_FILE);
JSDocInfoBuilder baseDocs = JSDocInfoBuilder.copyFrom(baseExterns.getJSDocInfo());
baseDocs.changeBaseType(elementBaseType);
baseExterns.setJSDocInfo(baseDocs.build());
block.addChildToBack(baseExterns);
for (Node baseProp : polymerElementProps) {
Node newProp = baseProp.cloneTree();
Node newPropRootName =
NodeUtil.getRootOfQualifiedName(newProp.getFirstFirstChild());
newPropRootName.setString(polymerElementType);
block.addChildToBack(newProp);
}
block.useSourceInfoIfMissingFromForTree(polymerElementExterns);
Node parent = polymerElementExterns.getParent();
Node stmts = block.removeChildren();
parent.addChildrenAfter(stmts, polymerElementExterns);
compiler.reportChangeToEnclosingScope(stmts);
}
/** Any member of a Polymer element or Behavior. These can be functions, properties, etc. */
static class MemberDefinition {
/** Any {@link JSDocInfo} tied to this member. */
final JSDocInfo info;
/** Name {@link Node} for the definition of this member. */
final Node name;
/** Value {@link Node} (RHS) for the definition of this member. */
final Node value;
MemberDefinition(JSDocInfo info, Node name, Node value) {
this.info = info;
this.name = name;
this.value = value;
}
@Override
public String toString() {
return toStringHelper(this).add("name", name).add("value", value).toString();
}
}
}