| java.lang.Object
 org.mozilla.javascript.Decompiler
| Decompiler | | public class Decompiler (Code) | | The following class save decompilation information about the source.
Source information is returned from the parser as a String
associated with function nodes and with the toplevel script. When
saved in the constant pool of a class, this string will be UTF-8
encoded, and token values will occupy a single byte.
Source is saved (mostly) as token numbers. The tokens saved pretty
much correspond to the token stream of a 'canonical' representation
of the input program, as directed by the parser. (There were a few
cases where tokens could have been left out where decompiler could
easily reconstruct them, but I left them in for clarity). (I also
looked adding source collection to TokenStream instead, where I
could have limited the changes to a few lines in getToken... but
this wouldn't have saved any space in the resulting source
representation, and would have meant that I'd have to duplicate
parser logic in the decompiler to disambiguate situations where
newlines are important.) The function decompile expands the
tokens back into their string representations, using simple
lookahead to correct spacing and indentation.
Assignments are saved as two-token pairs (Token.ASSIGN, op). Number tokens
are stored inline, as a NUMBER token, a character representing the type, and
either 1 or 4 characters representing the bit-encoding of the number. String
types NAME, STRING and OBJECT are currently stored as a token type,
followed by a character giving the length of the string (assumed to
be less than 2^16), followed by the characters of the string
inlined into the source string. Changing this to some reference to
to the string in the compiled class' constant pool would probably
save a lot of space... but would require some method of deriving
the final constant pool entry from information available at parse
time.
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| Field Summary | |
| final public static int | CASE_GAP_PROP
Decompilation property to specify identation offset for case labels. | | final public static int | INDENT_GAP_PROP
Decompilation property to specify default identation offset. | | final public static int | INITIAL_INDENT_PROP
Decompilation property to specify initial ident value. | | final public static int | ONLY_BODY_FLAG
Flag to indicate that the decompilation should omit the
function header and trailing brace. | | final public static int | TO_SOURCE_FLAG
Flag to indicate that the decompilation generates toSource result. |
| CASE_GAP_PROP | | final public static int CASE_GAP_PROP(Code) | | Decompilation property to specify identation offset for case labels.
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| INDENT_GAP_PROP | | final public static int INDENT_GAP_PROP(Code) | | Decompilation property to specify default identation offset.
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| INITIAL_INDENT_PROP | | final public static int INITIAL_INDENT_PROP(Code) | | Decompilation property to specify initial ident value.
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| ONLY_BODY_FLAG | | final public static int ONLY_BODY_FLAG(Code) | | Flag to indicate that the decompilation should omit the
function header and trailing brace.
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| TO_SOURCE_FLAG | | final public static int TO_SOURCE_FLAG(Code) | | Flag to indicate that the decompilation generates toSource result.
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| addEOL | | void addEOL(int token)(Code) | | |
| addNumber | | void addNumber(double n)(Code) | | |
| addToken | | void addToken(int token)(Code) | | |
| decompile | | public static String decompile(String source, int flags, UintMap properties)(Code) | | Decompile the source information associated with this js
function/script back into a string. For the most part, this
just means translating tokens back to their string
representations; there's a little bit of lookahead logic to
decide the proper spacing/indentation. Most of the work in
mapping the original source to the prettyprinted decompiled
version is done by the parser.
Parameters:
source - encoded source tree presentation
Parameters:
flags - flags to select output format
Parameters:
properties - indentation properties |
| getCurrentOffset | | int getCurrentOffset()(Code) | | |
| markFunctionEnd | | int markFunctionEnd(int functionStart)(Code) | | |
| markFunctionStart | | int markFunctionStart(int functionType)(Code) | | |
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