Package org.openjdk.asmtools.jcoder
Class Scanner
java.lang.Object
org.openjdk.asmtools.jcoder.Scanner
A Scanner for Jcoder tokens. Errors are reported to the environment object.
The scanner keeps track of the current token, the value of the current token (if any), and the start position of the current token.
The scan() method advances the scanner to the next token in the input.
The match() method is used to quickly match opening brackets (ie: '(', '{', or '[') with their closing counter part. This is useful during error recovery.
The compiler treats either "\n", "\r" or "\r\n" as the end of a line.
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Field Summary
FieldsModifier and TypeFieldDescriptionprotected int
The current characterprotected String
protected SourceFile
Where errors are reportedstatic final int
End of inputprotected SourceFile
Input streamprotected int
protected int
protected int
static final int
protected org.openjdk.asmtools.jcoder.ByteBuffer
protected long
protected String
protected int
The position of the current tokenprotected int
The current characterprotected int
The position of the previous tokenprotected int
protected String
protected JcodTokens.Token
Current token -
Constructor Summary
ConstructorsModifierConstructorDescriptionprotected
Scanner
(SourceFile sf) for use in jcfront.protected
Scanner
(SourceFile sf, HashMap<String, String> macros) Create a scanner to scan an input stream. -
Method Summary
Modifier and TypeMethodDescriptionprotected void
match
(JcodTokens.Token open, JcodTokens.Token close) Scan to a matching '}', ']' or ')'.protected int
scan()
Scan the next token.protected int
Scan the next token.protected void
skipTill
(int sym) protected int
xscan()
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Field Details
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EOF
public static final int EOFEnd of input- See Also:
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LBRACE
public static final int LBRACE- See Also:
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env
Where errors are reported -
in
Input stream -
ch
protected int chThe current character -
prevCh
protected int prevChThe current character -
macro
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indexMacro
protected int indexMacro -
token
Current token -
pos
protected int posThe position of the current token -
prevPos
protected int prevPosThe position of the previous token -
longValue
protected long longValue -
intValue
protected int intValue -
intSize
protected int intSize -
stringValue
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longStringValue
protected org.openjdk.asmtools.jcoder.ByteBuffer longStringValue -
sign
protected int sign -
docComment
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Constructor Details
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Scanner
Create a scanner to scan an input stream.- Throws:
IOException
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Scanner
for use in jcfront.- Throws:
IOException
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Method Details
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skipTill
- Throws:
IOException
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xscan
- Throws:
IOException
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match
Scan to a matching '}', ']' or ')'. The current token must be a '{', '[' or '(';- Throws:
IOException
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scan
Scan the next token.- Returns:
- the position of the previous token.
- Throws:
IOException
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scanMacro
Scan the next token.- Returns:
- the position of the previous token.
- Throws:
IOException
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