java - gawk或grep : single line and ungreedy

Question

我想在所有具有两个以上类型参数(即下面示例中的*.java中的参数)的所有子目录中递归打印<R ... H>文件的标题。其中一个文件看起来像(为简洁起见，名称被简化):
多行代码。java

class ClazzA<R extends A,
    S extends B<T>, T extends C<T>,
    U extends D, W extends E,
    X extends F, Y extends G, Z extends H>
    extends OtherClazz<S> implements I<T> {

  public void method(Type<Q, R> x) { 
    // ... code ...
  }
}

具有预期的输出:

ClazzA.java:10: class ClazzA<R extends A,
ClazzA.java:11:     S extends B<T>, T extends C<T>,
ClazzA.java:12:     U extends D, W extends E,
ClazzA.java:13:     X extends F, Y extends G, Z extends H>
ClazzA.java:14:     extends OtherClazz<S> implements I<T> {

但是另一个也可能像这样:
单行.java

class ClazzB<R extends A, S extends B<T>, T extends C<T>, U extends D, W extends E, X extends F, Y extends G, Z extends H> extends OtherClazz<S> implements I<T> {

  public void method(Type<Q, R> x) { 
    // ... code ...
  }
}

具有预期的输出:

ClazzB.java:42: class ClazzB<R extends A, S extends B<T>, T extends C<T>, U extends D, W extends E, X extends F, Y extends G, Z extends H> extends OtherClazz<S> implements I<T> {

不应考虑/打印的文件:
X-no-parameter.java

class ClazzC /* no type parameter */ extends OtherClazz<S> implements I<T> {

  public void method(Type<A, B> x) { 
    // ... code ...
  }
}

X-one-parameter.java

class ClazzD<R extends A>  // only one type parameter
    extends OtherClazz<S> implements I<T> {

  public void method(Type<X, Y> x) { 
    // ... code ...
  }
}

X-two-parameters.java

class ClazzE<R extends A, S extends B<T>>  // only two type parameters
    extends OtherClazz<S> implements I<T> {

  public void method(Type<X, Y> x) { 
    // ... code ...
  }
}

X-two-line-parameters.java

class ClazzF<R extends A,  // only two type parameters
    S extends B<T>>        // on two lines
    extends OtherClazz<S> implements I<T> {

  public void method(Type<X, Y> x) { 
    // ... code ...
  }
}

文件中的所有空格都可以是 \s+。紧邻 extends [...]的 implements [...]和 {是可选的。 extends [...]在每个类型参数上也是可选的。有关详细信息，请参见 The Java® Language Specification, 8.1. Class Declarations。
我在Git Bash中使用 gawk:

$ gawk --version
GNU Awk 5.0.0, API: 2.0 (GNU MPFR 4.0.2, GNU MP 6.2.0)

和:

find . -type f -name '*.java' | xargs gawk -f ws-class-type-parameter.awk > ws-class-type-parameter.log

和 ws-class-type-parameter.awk:

# /start/ , /end/ ... pattern

#/class ClazzA<.*,.*/      , /{/  {    # 5 lines, OK for ClazzA, but in real it prints classes with 2 or less type parameters, too
#/class ClazzA<.*,.*,/     , /{/  {    # no line with ClazzA, since there's no second ',' on its first line
#/class ClazzA<.*,.*,/s    , /{/  {    # 500.000+(!) lines
#/class ClazzA<.*,.*,/s    , /{/U {    # 500.000+(!) lines
#/class ClazzA<.*,.*,/sU   , /{/U {    # 500.000+(!) lines
 /(?s)class ClazzA<.*,.*,/ , /{/  {    # no line

    match( FILENAME, "/.*/.." )
    print substr( FILENAME, RLENGTH ) ":" FNR ": " $0
}

这样可以找到所有的 *.java文件...很好，可以对每个文件都执行 gawk ...很好，但是在我尝试之后，您会看到结果作为注释。请注意: ClazzA文字仅用于测试，此处为 MCVE。它实际上可能是 \w+，但是在测试时在成千上万的文件中有500.000+行...
如果我在 regex101.com上尝试，它会起作用。好吧，有点。我没有找到如何在其中定义 /start-regex/,/end-regex/，因此在两者之间添加了另一个 .*。
我从那里获取了标志，但是找不到 gawk是否支持标志语法 /.../sU , /.../U的描述，因此我尝试了一下。现在删除的注释告诉我，没有 awk风格支持此功能。
我也尝试了 grep:

$ grep --version
grep (GNU grep) 3.1
...
$ grep -nrPf types.grep *.java

使用 types.grep :

(?s).*class\s+\w+\s*<.*,.*,.*>.*{

结果仅输出 singleline.java。(?s)是--perl-regexp, -P语法，并且grep --help声称支持此语法。
更新
埃德·莫顿(Ed Morton)的答案中的解决方案效果很好，但事实证明，存在使用以下方法自动生成的文件:

    /** more code before here */    
    public void setId(String value) {
        this.id = value;
    }

    /**
     * Gets a map that contains attributes that aren't bound to any typed property on this class.
     * 
     * <p>
     * the map is keyed by the name of the attribute and 
     * the value is the string value of the attribute.
     * 
     * the map returned by this method is live, and you can add new attribute
     * by updating the map directly. Because of this design, there's no setter.
     * 
     * 
     * @return
     *     always non-null
     */
    public Map<QName, String> getOtherAttributes() {
        return otherAttributes;
    }

给出的输出例如:

AbstractAddressType.java:81:      * Gets a map that contains attributes that aren't bound to any typed property on this class.
AbstractAddressType.java:82:      * 
AbstractAddressType.java:83:      * <p>
AbstractAddressType.java:84:      * the map is keyed by the name of the attribute and 
AbstractAddressType.java:85:      * the value is the string value of the attribute.
AbstractAddressType.java:86:      * 
AbstractAddressType.java:87:      * the map returned by this method is live, and you can add new attribute
AbstractAddressType.java:88:      * by updating the map directly. Because of this design, there's no setter.
AbstractAddressType.java:89:      * 
AbstractAddressType.java:90:      * 
AbstractAddressType.java:91:      * @return
AbstractAddressType.java:92:      *     always non-null
AbstractAddressType.java:93:      */
AbstractAddressType.java:94:     public Map<QName, String> getOtherAttributes() {

以及其他具有类注释和注解的对象，例如:

/**
 * This class was generated by Apache CXF 3.3.4
 * 2020-11-30T12:03:21.251+01:00
 * Generated source version: 3.3.4
 *
 */
@WebService(targetNamespace = "urn:SZRServices", name = "SZR")
@XmlSeeAlso({at.gv.egov.pvp1.ObjectFactory.class, org.w3._2001._04.xmldsig_more_.ObjectFactory.class, ObjectFactory.class, org.xmlsoap.schemas.ws._2002._04.secext.ObjectFactory.class, org.w3._2000._09.xmldsig_.ObjectFactory.class, at.gv.e_government.reference.namespace.persondata._20020228_.ObjectFactory.class})
public interface SZR {
// more code after here

输出例如

SZR.java:13:  * This class was generated by Apache CXF 3.3.4
SZR.java:14:  * 2020-10-12T11:51:35.175+02:00
SZR.java:15:  * Generated source version: 3.3.4
SZR.java:16:  *
SZR.java:17:  */
SZR.java:18: @WebService(targetNamespace = "urn:SZRServices", name = "SZR")
SZR.java:19: @XmlSeeAlso({at.gv.egov.pvp1.ObjectFactory.class, org.w3._2001._04.xmldsig_more_.ObjectFactory.class, ObjectFactory.class, org.xmlsoap.schemas.ws._2002._04.secext.ObjectFactory.class, org.w3._2000._09.xmldsig_.ObjectFactory.class, at.gv.e_government.reference.namespace.persondata._20020228_.ObjectFactory.class})

Answer 1

在每个UNIX框的任何shell中使用任何POSIX awk:

$ cat tst.awk
/[[:space:]]*class[[:space:]]*/ {
    inDef = 1
    fname = FILENAME
    sub(".*/","",fname)
    def = out = ""
}
inDef {
    out = out fname ":" FNR ": " $0 ORS

    # Remove comments (not perfect but should work for 99.9% of cases)
    sub("//.*","")
    gsub("/[*]|[*]/","\n")
    gsub(/\n[^\n]*\n/,"")

    def = def $0 ORS
    if ( /{/ ) {
        if ( gsub(/,/,"&",def) > 2 ) {
            printf "%s", out
        }
        inDef = 0
    }
}

$ find tmp -type f -name '*.java' -exec awk -f tst.awk {} +
multiple-lines.java:1: class ClazzA<R extends A,
multiple-lines.java:2:     S extends B<T>, T extends C<T>,
multiple-lines.java:3:     U extends D, W extends E,
multiple-lines.java:4:     X extends F, Y extends G, Z extends H>
multiple-lines.java:5:     extends OtherClazz<S> implements I<T> {
single-line.java:1: class ClazzB<R extends A, S extends B<T>, T extends C<T>, U extends D, W extends E, X extends F, Y extends G, Z extends H> extends OtherClazz<S> implements I<T> {

上面是使用此输入运行的:

$ head tmp/*
==> tmp/X-no-parameter.java <==
class ClazzC /* no type parameter */ extends OtherClazz<S> implements I<T> {

  public void method(Type<A, B> x) {
    // ... code ...
  }
}

==> tmp/X-one-parameter.java <==
class ClazzD<R extends A>  // only one type parameter
    extends OtherClazz<S> implements I<T> {

  public void method(Type<X, Y> x) {
    // ... code ...
  }
}

==> tmp/X-two-line-parameters.java <==
class ClazzF<R extends A,  // only two type parameters
    S extends B<T>>        // on two lines
    extends OtherClazz<S> implements I<T> {

  public void method(Type<X, Y> x) {
    // ... code ...
  }
}

==> tmp/X-two-parameters.java <==
class ClazzE<R extends A, S extends B<T>>  // only two type parameters
    extends OtherClazz<S> implements I<T> {

  public void method(Type<X, Y> x) {
    // ... code ...
  }
}

==> tmp/multiple-lines.java <==
class ClazzA<R extends A,
    S extends B<T>, T extends C<T>,
    U extends D, W extends E,
    X extends F, Y extends G, Z extends H>
    extends OtherClazz<S> implements I<T> {

  public void method(Type<Q, R> x) {
    // ... code ...
  }
}

==> tmp/single-line.java <==
class ClazzB<R extends A, S extends B<T>, T extends C<T>, U extends D, W extends E, X extends F, Y extends G, Z extends H> extends OtherClazz<S> implements I<T> {

  public void method(Type<Q, R> x) {
    // ... code ...
  }
}

以上只是尽力而为，无需编写用于该语言的解析器，而只是让OP张贴示例输入/输出以继续处理需要处理的内容。