Java🔗ℹ

The _ast.ss_ module defines a hierarchy of structures representing nodes in the

abstract syntax tree of a Java program. The structures are organized according

to the following hierarchy:

    ast

        o src :: (optional src)

        |

        +-- id

        |       o name :: symbol

        |

        +-- name

        |       o path :: (listof id)

        |       o id :: id

        |

        +-- import

        |       o name :: name

        |       o star? :: boolean

        |

        +-- type-spec

        |       o base-type :: type-name

        |       o dimension :: natural-number

        |

        +-- modifier

        |       o modifier :: symbol

        |

        +-- initializer

        |       o static? :: boolean

        |       o body :: block-stmt

        |

        +-- compilation-unit

        |       o package :: (optional name)

        |       o imports :: (listof import)

        |       o classes :: (listof (optional type-decl))

        |

        +-- decl

        |       o modifiers :: (listof modifier)

        |       o name :: id

        |       |

        |       +-- type-decl

        |       |       o interfaces :: (listof name)

        |       |       o body :: (listof class-element)

        |       |       |

        |       |       +-- class-decl

        |       |       |       o super :: (optional name)

        |       |       |

        |       |       +-- interface-decl

        |       |

        |       +-- variable-decl

        |       |       o type :: type-spec

        |       |       o init :: (optional expr)

        |       |

        |       +-- behavior-decl

        |               o formals :: (listof variable-decl)

        |               o throws :: (listof name)

        |               o body :: block-stmt

        |               |

        |               +-- constructor-decl

        |               |

        |               +-- method-decl

        |                       o return-type :: type-spec

        |

        +-- stmt

        |       |

        |       +-- expr-stmt

        |       |       o expr :: expr

        |       |

        |       +-- labeled-stmt

        |       |       o label :: id

        |       |       o stmt :: (optional stmt)

        |       |

        |       +-- block-stmt

        |       |       o body :: (listof block-element)

        |       |

        |       +-- switch-stmt

        |       |       o expr :: expr

        |       |       o clauses :: (listof (union case-stmt block-element))

        |       |

        |       +-- case-stmt

        |       |       o test :: (optional expr)

        |       |

        |       +-- if-stmt

        |       |       o test :: expr

        |       |       o con :: (optional stmt)

        |       |       o alt :: (optional stmt)

        |       |

        |       +-- for-stmt

        |       |       o init :: (union (listof variable-decl) (listof expr))

        |       |       o test :: (optional expr)

        |       |       o update :: (listof expr)

        |       |       o body :: (optional stmt)

        |       |

        |       +-- while-stmt

        |       |       o test :: expr

        |       |       o body :: (optional stmt)

        |       |

        |       +-- do-stmt

        |       |       o body :: stmt

        |       |       o test :: expr

        |       |

        |       +-- break-stmt

        |       |       o label :: (optional id)

        |       |

        |       +-- continue-stmt

        |       |       o label :: (optional id)

        |       |

        |       +-- return-stmt

        |       |       o value :: (optional expr)

        |       |

        |       +-- throw-stmt

        |       |       o expr :: expr

        |       |

        |       +-- synchronized-stmt

        |       |       o expr :: expr

        |       |       o body :: stmt

        |       |

        |       +-- try-stmt

        |       |       o body :: block-stmt

        |       |       o catches :: (listof catch-stmt)

        |       |       o finally :: (optional block-stmt)

        |       |

        |       +-- catch-stmt

        |       |       o exception :: variable-decl

        |       |       o body :: block-stmt

        |       |

        |       +-- assert-stmt

        |               o predicate :: expr

        |               o message :: expr

        |

        +-- expr

                |

                +-- conditional-expr

                |       o test :: expr

                |       o con :: expr

                |       o alt :: expr

                |

                +-- prefix-expr

                |       o op-src :: src

                |       o operator :: symbol

                |       o operand :: expr

                |

                +-- postfix-expr

                |       o op-src :: src

                |       o operator :: symbol

                |       o operand :: expr

                |

                +-- unary-expr

                |       o op-src :: src

                |       o operator :: symbol

                |       o operand :: expr

                |

                +-- binary-expr

                |       o op-src :: src

                |       o operator :: symbol

                |       o left :: expr

                |       o right :: expr

                |

                +-- instanceof-expr

                |       o op-src :: src

                |       o expr :: expr

                |       o type :: type-spec

                |

                +-- literal

                |       o value :: any

                |       |

                |       +-- boolean-literal

                |       |

                |       +-- char-literal

                |       |

                |       +-- integer-literal

                |       |

                |       +-- long-literal

                |       |

                |       +-- float-literal

                |       |

                |       +-- double-literal

                |       |

                |       +-- string-literal

                |       |

                |       +-- null-literal

                |

                +-- class-expr

                |       o type :: type-spec

                |

                +-- new-object-expr

                |       o container :: (optional expr)

                |       o name :: name

                |       o args :: (listof expr)

                |       o class-body :: (optional (listof class-element))

                |

                +-- new-array-expr

                |       o type :: type-spec

                |       o dim-exprs :: (listof expr)

                |       o dim :: natural-number

                |       o init :: (optional array-initializer)

                |

                +-- array-initializer

                |       o contents :: (listof expr)

                |

                +-- call-expr

                |       o object :: (optional expr)

                |       o name :: name

                |       o args :: (listof expr)

                |

                +-- assign-expr

                |       o operator :: symbol

                |       o left :: access

                |       o right :: expr

                |

                +-- cast-expr

                |       o type :: type-spec

                |       o expr :: expr

                |

                +-- access

                        |

                        +-- field-access

                        |       o object :: expr

                        |       o name :: id

                        |

                        +-- array-access

                        |       o array :: expr

                        |       o index :: expr

                        |

                        +-- var-access

                                o var :: name

Every AST node can contain a field of type `src', which represents the source

location information of the item.

> (struct src (file line col span)) :: (optional path) * (optional natural-number) * (optional natural-number) * (optional natural-number)

> (name->access name) :: name -> access

Converts a name to a variable reference.

> (access->name acc) :: (union field-access var-access) -> name

Converts a field or local variable reference to a name.

FIXME: doesn't work with field accesses in general, since those can contain

arbitrary expressions, which can't be represented as names.  (In fact, it

appears that field-accesses always have non-name expressions; all other

field refs get mapped to var-access nodes instead.)

> (increase-type-dimension ts n) :: type-spec natural-number -> type-spec

Constructs a new type-spec which is equivalent to `ts' except with type

dimension increased by `n'.

> primitive-type ::= 'void | 'boolean | 'byte | 'short | 'int | 'long | 'char | 'float | 'double

> (primitive-type? v) :: any -> boolean

Members of class and interface declarations are represented by the type

`class-element', which is define by:

> class-element ::=

    decl

  | (nelistof variable-decl)

  | initializer

  | #f

> (class-element? v) :: any -> boolean

> block-element ::=

    decl

  | (nelistof variable-decl)

  | stmt

  | #f

> (block-element? v) :: any -> boolean

> type-name ::=

    primitive-type

  | name

> (type-name? v) :: any -> boolean

The _lexer.ss_ module provides a lexer for Java.

> Operators :: empty-tokens

> Separators :: empty-tokens

> EmptyLiterals :: empty-tokens

> Keywords :: empty-tokens

> BasicTokens :: tokens

> (struct string-error (string error-token)) :: string position-token

> (java-lexer in) :: input-port -> position-token

======================================================================

_syntax/parser.ss_:

======================================================================

The _parser.ss_ module provides a parser for Java.

> (parse in path) :: [input-port (optional (union path string))] -> ast

Parses a Java compilation unit (i.e., the contents of a .java file) from an

input port, with the given file name (used for error reporting).

> (parse-string str) :: string -> ast

Parses a Java compilation unit from a string.

> (parse-file path) :: (union path string) -> ast

Parses a Java compilation unit from a file.

The _semantic-object.ss_ library defines a hierarchy of mzscheme classes and

interfaces for the representation of the (static) semantic elements of a Java

program, e.g., classes, interfaces, methods, fields, etc.

> (struct type-name (package type [dimension])) :: (listof symbol) symbol? natural-number

The `type-name' structure contains enough information to identify a type

uniquely and can be used to look up a type with a class resolver (see

_class-resolver.ss). The `package' field contains the name of the type's package

(primitive types and members of the default package use the empty list). The

`type' field contains the symbolic name of the type. The optional `dimension'

field contains the array dimension and defaults to 0, representing a ground

(i.e., non-array) type.

> (build-type-name path) :: (listof symbol) -> type-name

Given a fully qualified type name as a list of symbols, this procedure builds a

`type-name' structure representing that name.

> (dot-notation path) :: (listof symbol) -> string

Given a fully qualified type name as a list of symbols, this procedure

constructs the string representation of the fully qualified name in Java

``dot-notation''.

> (type-name->string tn) :: (optional type-name) -> string

Given a `type-name' struct (or #f, representing the ``void'' type), this

procedure constructs the string representation of the fully qualified name in

Java ``dot-notation''.

> byte, char, double, float, int, long, short, boolean :: primitive-type%

Objects of class primitive-type% representing the Java primitive types of the

same respective name.

Interfaces

----------

The mzscheme interfaces defined in this library are organized according to the

following graph:

    semantic-object<%>   resolvable<%>

          |                   |

          +---------+---------+

                    |

                 type<%>

++ interface semantic-object<%>

> (to-string) :: -> string

Returns a string representation of the semantic object.

++ interface resolvable<%>

> (get-related-types) :: -> (listof type-name)

Returns the list of type-names that are referenced in the definition of the

semantic object.

++ interface type<%> extends semantic-object<%>, resolvable<%>

> (get-type-name) :: -> type-name

Returns the type-name representing the type object.

Classes

-------

The mzscheme classes defined in this library are organized according to the

following hierarchy (classes without parent classes extend the standard mzscheme

object% class):

    package% (semantic-object<%>, resolvable<%>)

    array-type% (type<%>)

    ground-type% (type<%>)

       |

       +-- primitive-type%

       |

       +-- declared-type%

              |

              +-- class%

              |

              +-- interface%

    type-element% (semantic-object<%>, resolvable<%>)

       |

       +-- field%

       |

       +-- behavior%

       |      |

       |      +-- constructor%

       |      |

       |      +-- method%

       |

       +-- initializer%

       |

       +-- inner-type%

++ class package% implements semantic-object<%>

> (new package% (name _)) -> package%

    name :: (listof symbol)

> (to-string) :: -> string

Returns the package name in dot-notation.

++ class array-type% implements type<%>

> (new array-type% (base-type _)) -> array-type%

    base-type :: type-name

> (get-type-name) :: -> type-name

> (get-base-type) :: -> type-name

> (get-dimension) :: -> natural-number

> (get-related-types) :: -> (listof type-name)

> (to-string) :: -> string

++ class ground-type% implements semantic-object<%>, type<%>

> (new ground-type% (package _) (name _)) -> ground-type%

    package :: (listof symbol)

    name :: type-name

> (get-package) :: -> (listof symbol)

THIS METHOD IS DEPRECATED. Use (type-name-package (send obj get-type-name))

instead. In the next major version release, this method will be removed.

> (get-type-name) :: -> type-name

> (get-related-types) :: (listof type-name)

> (to-string) :: -> string

++ class primitive-type% extends ground-type%

> (new primitive-type% (name _)) -> primitive-type%

    name :: type-name

++ class declared-type% extends ground-type%

> (new declared-type% (package-name _) (name _) (modifiers _) (interfaces _) (elements _)) -> declared-type%

    package-name :: (listof symbol)

    name :: type-name

    modifiers :: (listof access-flags)

    interfaces :: (listof type-name)

    elements :: (listof type-element%)

> (get-modifiers) :: -> (listof access-flag)

> (get-interfaces) :: -> (listof type-name)

> (get-elements) :: -> (listof type-element%)

++ class class% extends declared-type%

> (new class% (package _) (name _) (modifiers _) (interfaces _) (elements _) (superclass _)) -> class%

    package :: (listof symbol)

    name :: type-name

    modifiers :: (listof access-flag)

    interfaces :: (listof type-name)

    elements :: (listof type-element%)

    superclass :: (optional type-name)

> (get-superclass) :: -> (optional type-name)

++ class interface% extends declared-type%

> (new interface% (package _) (name _) (modifiers _) (interfaces _) (elements _)) -> interface%

    package :: (listof symbol)

    name :: type-name

    modifiers :: (listof access-flag)

    interfaces :: (listof type-name)

    elements :: (listof type-element%)

++ class type-element% implements semantic-object<%>, resolvable<%>

> (new type-element% (name _)) -> type-element%

    name :: string

> (get-name) :: -> (option string)

> (get-related-types) :: (listof type-name)

> (to-string) :: -> string

++ class field% extends type-element%

> (new field% (name _) (modifiers _) (type _)) -> field%

    name :: string

    modifiers :: (listof access-flag)

    type :: type-name

> (get-modifiers) :: -> (listof access-flag)

> (get-type) :: -> type-name

++ class initializer% extends type-element%

> (new initializer%) -> intializer%

++ class behavior% extends type-element%

> (new behavior% (name _) (formals _) (exceptions _) (modifiers _)) -> behavior%

    name :: string

    formals :: (listof type-name)

    exceptions :: (listof type-name)

    modifiers :: (listof access-flag)

> (get-formals) :: -> (listof type-name)

> (get-exceptions) :: -> (listof type-name)

> (get-modifiers) :: -> (listof access-flag)

++ class constructor% extends behavior%

> (new constructor% (name _) (formals _) (exceptions _) (modifiers _)) -> constructor%

    name :: string

    formals :: (listof type-name)

    exceptions :: (listof type-name)

    modifiers :: (listof access-flag)

++ class method% extends behavior%

> (new method% (name _) (formals _) (exceptions _) (modifiers _) (return-type _)) -> method%

    name :: string

    formals :: (listof type-name)

    exceptions :: (listof type-name)

    modifiers :: (listof access-flag)

    return-type :: (optional type-name)

> (get-return-type) :: -> (optional type-name)

++ class inner-type% extends type-element%

> (new inner-type% (name _) (type _)) -> inner-type%

    name :: string

    type :: type-name

> (get-type) :: -> type-name

;; TODO: this should not be starting out #f

> (current-class-resolver [cr]) :: (parameterof class-resolver<%>)

> (lookup-package pkg) :: (listof symbol) -> (optional package%)

> (lookup-type tn) :: type-name -> (optional type<%>)

> (resolve-all t) :: (union type-name semantic-object<%>) -> any

Forces the resolution (via the current class resolver) of the transitive closure

of the `get-related-types' relation on either a semantic object or the type

associated with a type-name.

++ interface class-resolver<%>

> (resolve-package path) :: (listof symbol) -> (optional package%)

> (resolve-type tn) :: type-name -> (optional type<%>)

++ class class-resolver% implements class-resolver<%>

> (new method% (name _) (formals _) (exceptions _) (modifiers _) (return-type _)) -> method%

    name :: string

    formals :: (listof type-name)

    exceptions :: (listof type-name)

    modifiers :: (listof access-flag)

    return-type :: (optional type-name)

> (new class-resolver% (classpath _) (sourcepath _)) -> class-resolver%

    classpath :: (listof path)

    sourcepath :: (listof path)

The initialization arguments specify the paths to search during class

resolution for binary and source resolution, respectively.  Both arguments

are optional.  If they are not specified, this class uses the value of

the current-classpath and current-sourcepath parameters, respectively, at

the time when the class was created.  Therefore, changing the value of

either of these parameters will *not* affect previously-created instances

of class-resolver%.

> (resolve-package path) :: (listof symbol) -> (optional package%)

> (resolve-type tn) :: type-name -> (option type<%>)

TODO: (resolve-source ast) :: ast -> (listof declared-type%)

> (resolve-binary cf) :: class-file -> declared-type%