Package org.openjdk.asmtools.jasm
Class Scanner
java.lang.Object
org.openjdk.asmtools.jasm.ParseBase
org.openjdk.asmtools.jasm.Scanner
A Scanner for Jasm 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.
-
Field Summary
FieldsModifier and TypeFieldDescriptionprivate char[]
protected int
private int
protected String
protected double
protected float
protected String
protected boolean
protected int
protected long
protected int
protected int
The position of the previous tokenprotected int
protected int
protected String
protected JasmTokens.Token
Fields inherited from class org.openjdk.asmtools.jasm.ParseBase
debugFlag, environment, parser, scanner
-
Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionprivate String
protected final void
Checks a token, throws an exception if not the sameprotected final boolean
Check the token may be identifierprotected void
protected final void
Expects a token, scans the next token or throws an exception.private void
putCh
(int ch) protected void
scan()
Scan the next token.private void
Scan a decimal at this pointprivate String
Scan a doc comment.private int
Scan an escape character.private void
scanIdentifier
(char[] prefix) Scan an Identifier.protected void
private void
Scan a number.private void
scanReal()
Scan a float.private void
Scan a string.private void
Scan a comment.protected final void
xscan()
Methods inherited from class org.openjdk.asmtools.jasm.ParseBase
init, init, init, setDebugFlag, traceMethodInfoLn, traceMethodInfoLn
-
Field Details
-
ch
protected int ch -
token
-
pos
protected int pos -
intValue
protected int intValue -
longValue
protected long longValue -
floatValue
protected float floatValue -
doubleValue
protected double doubleValue -
stringValue
-
idValue
-
radix
protected int radix -
docComment
-
prevPos
protected int prevPosThe position of the previous token -
sign
protected int sign -
inBits
protected boolean inBits -
count
private int count -
buffer
private char[] buffer -
escapingAllowed
-
noFunc
-
yesAndProcessFunc
-
-
Constructor Details
-
Scanner
main constructor.Create a scanner to scan an input stream.
-
-
Method Details
-
scanModuleStatement
protected void scanModuleStatement() -
scan
protected void scan()Scan the next token. -
checkTokenIdent
protected final boolean checkTokenIdent()Check the token may be identifier -
expect
Expects a token, scans the next token or throws an exception.- Throws:
SyntaxError
-
check
Checks a token, throws an exception if not the same- Throws:
SyntaxError
-
putCh
private void putCh(int ch) -
bufferString
-
skipComment
private void skipComment()Scan a comment. This method should be called once the initial /, * and the next character have been read. -
scanDocComment
Scan a doc comment. This method should be called once the initial /, * and * have been read. It gathers the content of the comment (without leading spaces and '*'s) in the string buffer. -
scanCPRef
private void scanCPRef()Scan a decimal at this point -
scanNumber
private void scanNumber()Scan a number. The first digit of the number should be the current character. We may be scanning hex, decimal, or octal at this point -
scanReal
private void scanReal()Scan a float. We are either looking at the decimal, or we have already seen it and put it into the buffer. We haven't seen an exponent. Scan a float. Should be called with the current character is either the 'e', 'E' or '.' -
scanEscapeChar
private int scanEscapeChar()Scan an escape character.- Returns:
- the character or '\\'
-
scanString
private void scanString()Scan a string. The current character should be the opening " of the string. -
scanIdentifier
private void scanIdentifier(char[] prefix) Scan an Identifier. The current character should be the first character of the identifier. -
xscan
protected final void xscan() -
debugScan
-