com.google.javascript.jscomp.JSDocInfoPrinter Maven / Gradle / Ivy

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Closure Compiler is a JavaScript optimizing compiler. It parses your JavaScript, analyzes it, removes dead code and rewrites and minimizes what's left. It also checks syntax, variable references, and types, and warns about common JavaScript pitfalls. It is used in many of Google's JavaScript apps, including Gmail, Google Web Search, Google Maps, and Google Docs.
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/*
 * Copyright 2014 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 com.google.common.base.Joiner;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Ordering;
import com.google.javascript.rhino.JSDocInfo;
import com.google.javascript.rhino.JSDocInfo.Visibility;
import com.google.javascript.rhino.JSTypeExpression;
import com.google.javascript.rhino.Node;
import com.google.javascript.rhino.Token;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Set;

/**
 * Prints a JSDocInfo, used for preserving type annotations in ES6 transpilation.
 *
 */
public final class JSDocInfoPrinter {

  private final boolean useOriginalName;
  private final boolean printDesc;

  public JSDocInfoPrinter(boolean useOriginalName) {
    this(useOriginalName, false);
  }

  /**
   * @param useOriginalName Whether to use the original name field when printing types.
   * @param printDesc Whether to print block, param, and return descriptions.
   */
  public JSDocInfoPrinter(boolean useOriginalName, boolean printDesc) {
    this.useOriginalName = useOriginalName;
    this.printDesc = printDesc;
  }

  public String print(JSDocInfo info) {
    boolean multiline = false;

    List parts = new ArrayList<>();

    // order:
    //   externs|typeSummary
    //   export|public|private|package|protected
    //   abstract
    //   lends
    //   const
    //   final
    //   desc
    //   dict|struct|unrestricted
    //   constructor|interface|record
    //   extends
    //   implements
    //   this
    //   param
    //   return
    //   throws
    //   template
    //   override
    //   type|define|typedef|enum
    //   implicitCast
    //   nocollapse
    //   suppress
    //   deprecated
    //   polymer
    //   polymerBehavior
    //   mixinFunction
    //   closurePrimitive
    parts.add("/**");

    if (info.isExterns()) {
      parts.add("@externs");
    } else if (info.isTypeSummary()) {
      parts.add("@typeSummary");
    }

    if (info.isExport()) {
      parts.add("@export");
    } else if (info.getVisibility() != null
        && info.getVisibility() != Visibility.INHERITED) {
      parts.add("@" + info.getVisibility().toString().toLowerCase());
    }

    if (info.isAbstract()) {
      parts.add("@abstract");
    }

    if (info.hasLendsName()) {
      parts.add(buildAnnotationWithType("lends", info.getLendsName().getRoot()));
    }

    if (info.hasConstAnnotation() && !info.isDefine()) {
      parts.add("@const");
    }

    if (info.isFinal()) {
      parts.add("@final");
    }

    String description = info.getDescription();
    if (description != null) {
      multiline = true;
      parts.add("@desc " + description);
    }

    if (info.makesDicts()) {
      parts.add("@dict");
    }

    if (info.makesStructs()) {
      parts.add("@struct");
    }

    if (info.makesUnrestricted()) {
      parts.add("@unrestricted ");
    }

    if (info.isConstructor()) {
      parts.add("@constructor");
    }

    if (info.isInterface() && !info.usesImplicitMatch()) {
      parts.add("@interface");
    }

    if (info.isInterface() && info.usesImplicitMatch()) {
      parts.add("@record");
    }

    if (info.hasBaseType()) {
      multiline = true;
      Node typeNode = stripBang(info.getBaseType().getRoot());
      parts.add(buildAnnotationWithType("extends", typeNode));
    }

    for (JSTypeExpression type : info.getExtendedInterfaces()) {
      multiline = true;
      Node typeNode = stripBang(type.getRoot());
      parts.add(buildAnnotationWithType("extends", typeNode));
    }

    for (JSTypeExpression type : info.getImplementedInterfaces()) {
      multiline = true;
      Node typeNode = stripBang(type.getRoot());
      parts.add(buildAnnotationWithType("implements", typeNode));
    }

    if (info.hasThisType()) {
      multiline = true;
      Node typeNode = stripBang(info.getThisType().getRoot());
      parts.add(buildAnnotationWithType("this", typeNode));
    }

    if (info.getParameterCount() > 0) {
      multiline = true;
      for (String name : info.getParameterNames()) {
        parts.add("@param " + buildParamType(info, name));
      }
    }

    if (info.hasReturnType()) {
      multiline = true;
      parts.add(
          buildAnnotationWithType("return", info.getReturnType(), info.getReturnDescription()));
    }

    if (!info.getThrownTypes().isEmpty()) {
      parts.add(buildAnnotationWithType("throws", info.getThrownTypes().get(0)));
    }

    ImmutableList names = info.getTemplateTypeNames();
    if (!names.isEmpty()) {
      parts.add("@template " + Joiner.on(", ").join(names));
      multiline = true;
    }

    ImmutableMap typeTransformations = info.getTypeTransformations();
    if (!typeTransformations.isEmpty()) {
      multiline = true;
      for (Map.Entry e : typeTransformations.entrySet()) {
        String name = e.getKey();
        String tranformationDefinition = new CodePrinter.Builder(e.getValue()).build();
        parts.add("@template " + name + " := " +  tranformationDefinition  + " =:");
      }
    }

    if (info.isOverride()) {
      parts.add("@override");
    }

   if (info.hasType() && !info.isDefine()) {
      if (info.isInlineType()) {
        parts.add(typeNode(info.getType().getRoot()));
      } else {
        parts.add(buildAnnotationWithType("type", info.getType()));
      }
    }

    if (info.isDefine()) {
      parts.add(buildAnnotationWithType("define", info.getType()));
    }

    if (info.hasTypedefType()) {
      parts.add(buildAnnotationWithType("typedef", info.getTypedefType()));
    }

    if (info.hasEnumParameterType()) {
      parts.add(buildAnnotationWithType("enum", info.getEnumParameterType()));
    }

    if (info.isImplicitCast()) {
      parts.add("@implicitCast");
    }

    if (info.isNoCollapse()) {
      parts.add("@nocollapse");
    }

    Set suppressions = info.getSuppressions();
    if (!suppressions.isEmpty()) {
      // Print suppressions in sorted order to avoid non-deterministic output.
      String[] arr = suppressions.toArray(new String[0]);
      Arrays.sort(arr, Ordering.natural());
      parts.add("@suppress {" + Joiner.on(',').join(arr) + "}");
      multiline = true;
    }

    if (info.isDeprecated()) {
      parts.add("@deprecated " + info.getDeprecationReason());
      multiline = true;
    }

    if (info.isPolymer()) {
      multiline = true;
      parts.add("@polymer");
    }
    if (info.isPolymerBehavior()) {
      multiline = true;
      parts.add("@polymerBehavior");
    }
    if (info.isMixinFunction()) {
      multiline = true;
      parts.add("@mixinFunction");
    }
    if (info.isMixinClass()) {
      multiline = true;
      parts.add("@mixinClass");
    }
    if (info.isCustomElement()) {
      multiline = true;
      parts.add("@customElement");
    }

    if (info.getClosurePrimitiveId() != null) {
      parts.add("@closurePrimitive {" + info.getClosurePrimitiveId() + "}");
    }

    if (printDesc && info.getBlockDescription() != null) {
      String cleaned = info.getBlockDescription().replaceAll("\n\\s*\\*\\s*", "\n");
      if (!cleaned.isEmpty()) {
        multiline = true;
        cleaned = cleaned.trim();
        if (parts.size() > 1) {
          // If there is more than one part - the opening "/**" - then add blank line between the
          // description and everything else.
          cleaned += '\n';
        }
        parts.add(1, cleaned);
      }
    }

    StringBuilder sb = new StringBuilder();
    if (multiline) {
      Joiner.on("\n").appendTo(sb, parts);
    } else {
      Joiner.on(" ").appendTo(sb, parts);
      sb.append(" */");
    }
    // Ensure all lines start with " *", and then ensure all non blank lines have a space after
    // the *.
    String s = sb.toString().replaceAll("\n", "\n *").replaceAll("\n \\*([^ \n])", "\n * $1");
    if (multiline) {
      s += "\n */\n";
    } else {
      s += " ";
    }
    return s;
  }

  private Node stripBang(Node typeNode) {
    if (typeNode.getToken() == Token.BANG) {
      typeNode = typeNode.getFirstChild();
    }
    return typeNode;
  }

  private String buildAnnotationWithType(String annotation, JSTypeExpression type) {
    return buildAnnotationWithType(annotation, type, null);
  }

  private String buildAnnotationWithType(
      String annotation, JSTypeExpression type, String description) {
    return buildAnnotationWithType(annotation, type.getRoot(), description);
  }

  private String buildAnnotationWithType(String annotation, Node type) {
    return buildAnnotationWithType(annotation, type, null);
  }

  private String buildAnnotationWithType(String annotation, Node type, String description) {
    StringBuilder sb = new StringBuilder();
    sb.append("@");
    sb.append(annotation);
    sb.append(" {");
    appendTypeNode(sb, type);
    sb.append("}");
    if (description != null) {
      sb.append(" ");
      sb.append(description);
    }
    return sb.toString();
  }

  private String buildParamType(JSDocInfo info, String name) {
    JSTypeExpression type = info.getParameterType(name);
    if (type != null) {
      String p =
          "{"
              + typeNode(type.getRoot())
              + "} "
              + name
              + (printDesc && info.getDescriptionForParameter(name) != null
                  // Don't add a leading space; the parser retained it.
                  ? info.getDescriptionForParameter(name)
                  : "");
      return p.trim();
    } else {
      return name;
    }
  }

  private String typeNode(Node typeNode) {
    StringBuilder sb = new StringBuilder();
    appendTypeNode(sb, typeNode);
    return sb.toString();
  }

  private void appendTypeNode(StringBuilder sb, Node typeNode) {
    if (useOriginalName && typeNode.getOriginalName() != null) {
      sb.append(typeNode.getOriginalName());
      return;
    }
    if (typeNode.getToken() == Token.BANG) {
      sb.append("!");
      appendTypeNode(sb, typeNode.getFirstChild());
    } else if (typeNode.getToken() == Token.EQUALS) {
      appendTypeNode(sb, typeNode.getFirstChild());
      sb.append("=");
    } else if (typeNode.getToken() == Token.PIPE) {
      sb.append("(");
      Node lastChild = typeNode.getLastChild();
      for (Node child = typeNode.getFirstChild(); child != null; child = child.getNext()) {
        appendTypeNode(sb, child);
        if (child != lastChild) {
          sb.append("|");
        }
      }
      sb.append(")");
    } else if (typeNode.getToken() == Token.ELLIPSIS) {
      sb.append("...");
      if (typeNode.hasChildren() && !typeNode.getFirstChild().isEmpty()) {
        appendTypeNode(sb, typeNode.getFirstChild());
      }
    } else if (typeNode.getToken() == Token.STAR) {
      sb.append("*");
    } else if (typeNode.getToken() == Token.QMARK) {
      sb.append("?");
      if (typeNode.hasChildren()) {
        appendTypeNode(sb, typeNode.getFirstChild());
      }
    } else if (typeNode.isFunction()) {
      appendFunctionNode(sb, typeNode);
    } else if (typeNode.getToken() == Token.LC) {
      sb.append("{");
      Node lb = typeNode.getFirstChild();
      Node lastColon = lb.getLastChild();
      for (Node colon = lb.getFirstChild(); colon != null; colon = colon.getNext()) {
        if (colon.hasChildren()) {
          sb.append(colon.getFirstChild().getString()).append(":");
          appendTypeNode(sb, colon.getLastChild());
        } else {
          sb.append(colon.getString());
        }
        if (colon != lastColon) {
          sb.append(",");
        }
      }
      sb.append("}");
    } else if (typeNode.isVoid()) {
      sb.append("void");
    } else if (typeNode.isTypeOf()) {
      sb.append("typeof ");
      appendTypeNode(sb, typeNode.getFirstChild());
    } else {
      if (typeNode.hasChildren()) {
        sb.append(typeNode.getString())
            .append("<");
        Node child = typeNode.getFirstChild();
        Node last = child.getLastChild();
        for (Node type = child.getFirstChild(); type != null; type = type.getNext()) {
          appendTypeNode(sb, type);
          if (type != last) {
            sb.append(",");
          }
        }
        sb.append(">");
      } else {
        sb.append(typeNode.getString());
      }
    }
  }

  private void appendFunctionNode(StringBuilder sb, Node function) {
    boolean hasNewOrThis = false;
    sb.append("function(");
    Node first = function.getFirstChild();
    if (first.isNew()) {
      sb.append("new:");
      appendTypeNode(sb, first.getFirstChild());
      hasNewOrThis = true;
    } else if (first.isThis()) {
      sb.append("this:");
      appendTypeNode(sb, first.getFirstChild());
      hasNewOrThis = true;
    } else if (first.isEmpty()) {
      sb.append(")");
      return;
    } else if (!first.isParamList()) {
      sb.append("):");
      appendTypeNode(sb, first);
      return;
    }
    Node paramList = null;
    if (first.isParamList()) {
      paramList = first;
    } else if (first.getNext().isParamList()) {
      paramList = first.getNext();
    }
    if (paramList != null) {
      boolean firstParam = true;
      for (Node param : paramList.children()) {
        if (!firstParam || hasNewOrThis) {
          sb.append(",");
        }
        appendTypeNode(sb, param);
        firstParam = false;
      }
    }
    sb.append(")");

    Node returnType = function.getLastChild();
    if (!returnType.isEmpty()) {
      sb.append(":");
      appendTypeNode(sb, returnType);
    }
  }
}