com.oracle.truffle.api.source

Class Source.SourceBuilder

java.lang.Object

com.oracle.truffle.api.source.Source.SourceBuilder

Direct Known Subclasses:

Source.LiteralBuilder

Enclosing class:

Source

public class Source.SourceBuilder
extends Object

Allows one to specify additional attribute before creating new Source instance. To load a source from disk one can use:

assert file.getName().endsWith(".java") :
    "Imagine 'c:\\sources\\Example.java' file";

String language = Source.findLanguage(file);
Source source = Source.newBuilder(language, file).build();

assert file.getName().equals(source.getName());
assert file.getPath().equals(source.getPath());
assert file.toUri().equals(source.getURI());

To load source from a URL one can use:

URL resource = relativeClass.getResource("sample.js");
Source source = Source.newBuilder("js", resource)
                .build();
assert resource.toExternalForm().equals(source.getPath());
assert "sample.js".equals(source.getName());
assert resource.toURI().equals(source.getURI());

To create a source representing characters:

Source source = Source.newBuilder("js", "function() {\n"
                + "  return 'Hi';\n"
                + "}\n", "hi.js").build();
assert "hi.js".equals(source.getName());

or read a source from a Reader:

Reader stream = new InputStreamReader(
                relativeClass.getResourceAsStream("sample.js")
);
Source source = Source.newBuilder("js", stream, "sample.js")
    .build();
assert "sample.js".equals(source.getName());

To create a source representing bytes:

byte[] bytes = new byte[] {/* Binary */};
Source source = Source.newBuilder("llvm",
                ByteSequence.create(bytes),
                "<literal>").build();

Once your builder is configured, call Source.SourceBuilder.build() to perform the loading and construction of new Source.

Since:

19.0

Method Summary

Modifier and Type	Method and Description
Source	build() Uses configuration of this builder to create new Source object.
Source.SourceBuilder	cached(boolean enabled) Enables or disables code caching for this source.
Source.SourceBuilder	canonicalizePath(boolean canonicalize) Whether the Source.getPath() (from the TruffleFile) should be canonicalized.
Source.LiteralBuilder	content(org.graalvm.polyglot.io.ByteSequence bytes) Specifies byte based content of to-be-built Source.
Source.LiteralBuilder	content(CharSequence characters) Specifies character based content of to-be-built Source.
Source.SourceBuilder	encoding(Charset encoding) Explicitly assigns an encoding used to read the file content.
Source.SourceBuilder	interactive(boolean enabled) Marks the source as interactive.
Source.SourceBuilder	internal(boolean enabled) Marks the source as internal.
Source.SourceBuilder	mimeType(String mimeType) Explicitly assigns a MIME type to the to-be-built Source.
Source.SourceBuilder	name(String newName) Specifies a name to the to-be-built Source.
Source.SourceBuilder	uri(URI ownUri) Assigns new URI to the to-be-created Source.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

name

public Source.SourceBuilder name(String newName)

Specifies a name to the to-be-built Source.

Parameters:

newName - name that replaces the previously given one. If set to null then "Unnamed" will be used.

Returns:

instance of this builder

Since:

19.0

content

public Source.LiteralBuilder content(CharSequence characters)

Specifies character based content of to-be-built Source. Using this method one can ignore the real content of a file or URL and use already read one, or completely different one. Use Source.CONTENT_NONE to set no content, Source.hasCharacters() will be false then. The given characters must not mutate after they were accessed for the first time. Example:

URL resource = relativeClass.getResource("sample.js");
Source source = Source.newBuilder("js", resource)
    .content("{}")
    .build();
assert resource.toExternalForm().equals(source.getPath());
assert "sample.js".equals(source.getName());
assert resource.toExternalForm().equals(source.getURI().toString());
assert "{}".equals(source.getCharacters());

Parameters:

characters - the code to be available via Source.getCharacters(), or Source.CONTENT_NONE

Returns:

instance of this builder - which's Source.SourceBuilder.build() method no longer throws an IOException

Since:

19.0

content

public Source.LiteralBuilder content(org.graalvm.polyglot.io.ByteSequence bytes)

Specifies byte based content of to-be-built Source. Using this method one can ignore the real content of a file or URL and use already read one, or completely different one. The given bytes must not mutate after they were accessed for the first time. Example:

URL resource = relativeClass.getResource("sample.js");
Source source = Source.newBuilder("js", resource)
    .content("{}")
    .build();
assert resource.toExternalForm().equals(source.getPath());
assert "sample.js".equals(source.getName());
assert resource.toExternalForm().equals(source.getURI().toString());
assert "{}".equals(source.getCharacters());

Parameters:

bytes - the code to be available via Source.getBytes()

Returns:

instance of this builder - which's Source.SourceBuilder.build() method no longer throws an IOException

Since:

19.0

mimeType

public Source.SourceBuilder mimeType(String mimeType)

Explicitly assigns a MIME type to the to-be-built Source. If the MIME type is null then the default MIME type of the language will be used to interpret the source. If set explicitly then the language needs to support the MIME type in order to parse a source. If not null then the MIME type will be verified containing no spaces and a '/' between group and sub-group. An example for a valid MIME type is: text/javascript.

The MIME type can be guessed by the system based on files or urls.

Parameters:

mimeType - the new mime type to be assigned, or null if default MIME type should be used.

Returns:

instance of this builder ready to create new source

Since:

19.0

See Also:

LanguageInfo.getDefaultMimeType(), LanguageInfo.getMimeTypes(), Source.findMimeType(TruffleFile), Source.findMimeType(URL)

cached

public Source.SourceBuilder cached(boolean enabled)

Enables or disables code caching for this source. By default code caching is enabled. If true then the source does not require parsing every time this source is evaluated. If false then the source requires parsing every time the source is evaluated but does not remember any code. Disabling caching may be useful if the source is known to only be evaluated once.

If a source instance is no longer referenced by the client then all code caches will be freed automatically. Also, if the underlying context or engine is no longer referenced then cached code for evaluated sources will be freed automatically.

Returns:

instance of this builder ready to create new source

Since:

19.0

internal

public Source.SourceBuilder internal(boolean enabled)

Marks the source as internal. Internal sources are those that aren't created by user, but rather inherently present by the language system. Calling this method influences result of create Source.isInternal()

Returns:

the instance of this builder

Since:

19.0

interactive

public Source.SourceBuilder interactive(boolean enabled)

Marks the source as interactive. Evaluation of interactive sources by an interactive language can use the environment streams to print the result and read an input. However, non-interactive languages are expected to ignore the interactive property of sources and not use the environment streams. Any desired printing of the evaluated result provided by a non-interactive language needs to be handled by the caller. Calling of this method influences the result of Source.isInteractive().

Returns:

the instance of this builder

Since:

19.0

uri

public Source.SourceBuilder uri(URI ownUri)

Assigns new URI to the to-be-created Source. Each source provides Source.getURI() as a persistent identification of its location. A default value for the method is deduced from the location or content, but one can change it by using this method

Parameters:

ownUri - the URL to use instead of default one, cannot be null

Returns:

the instance of this builder

Since:

19.0

canonicalizePath

public Source.SourceBuilder canonicalizePath(boolean canonicalize)

Whether the Source.getPath() (from the TruffleFile) should be canonicalized. By default the path is canonicalized to improve Source caching. If set to false, then Source.getPath() will be the same as the passed TruffleFile TruffleFile.getPath().

Parameters:

canonicalize - whether to canonicalize the path from the the TruffleFile

Returns:

the instance of this builder

Since:

20.2

encoding

public Source.SourceBuilder encoding(Charset encoding)

Explicitly assigns an encoding used to read the file content. If the encoding is null then the file contained encoding information is used. If the file doesn't provide an encoding information the default UTF-8 encoding is used.

Parameters:

encoding - the new file encoding to be used for reading the content

Returns:

instance of this builder ready to create new source

Since:

19.0

build

public Source build()
             throws IOException

Uses configuration of this builder to create new Source object. The method throws an IOException if an error loading the source occurred.

Returns:

the source object

Throws:

IOException - if an error reading the content occurred

SecurityException - if the used filesystem denied file reading

Since:

19.0