Package org.openjdk.asmtools.jasm
Class Scanner
- java.lang.Object
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- org.openjdk.asmtools.jasm.ParseBase
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- org.openjdk.asmtools.jasm.Scanner
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public class Scanner extends ParseBase
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.
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Nested Class Summary
Nested Classes Modifier and Type Class Description protected static class
Scanner.SyntaxError
SyntaxError is the generic error thrown for parsing problems.
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Field Summary
Fields Modifier and Type Field Description protected int
ch
The current characterprotected char
charValue
protected java.lang.String
docComment
protected double
doubleValue
protected float
floatValue
protected java.lang.String
idValue
protected Environment
in
Input streamprotected boolean
inBits
protected int
intValue
protected long
longValue
protected int
pos
The position of the current tokenprotected int
prevPos
The position of the previous tokenprotected int
radix
protected int
sign
protected java.lang.String
stringValue
protected JasmTokens.Token
token
Current token
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Constructor Summary
Constructors Modifier Constructor Description protected
Scanner(Environment env)
main constructor.
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description protected void
check(JasmTokens.Token t)
Checks a token, throws an exception if not the sameprotected boolean
checkTokenIdent()
Check the token may be identifierprotected void
debugScan(java.lang.String dbstr)
protected void
expect(JasmTokens.Token t)
Expects a token, scans the next token or throws an exception.static boolean
isUCDigit(int ch)
Returns true if the character is a unicode digit.static boolean
isUCLetter(int ch)
Returns true if the character is a Unicode letter.protected void
scan()
scan Scan the next token.protected void
scanModuleStatement()
protected void
xscan()
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Methods inherited from class org.openjdk.asmtools.jasm.ParseBase
debugStr, enableDebug, init
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Field Detail
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in
protected Environment in
Input stream
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ch
protected int ch
The current character
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token
protected JasmTokens.Token token
Current token
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pos
protected int pos
The position of the current token
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charValue
protected char charValue
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intValue
protected int intValue
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longValue
protected long longValue
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floatValue
protected float floatValue
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doubleValue
protected double doubleValue
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stringValue
protected java.lang.String stringValue
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idValue
protected java.lang.String idValue
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radix
protected int radix
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docComment
protected java.lang.String docComment
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prevPos
protected int prevPos
The position of the previous token
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sign
protected int sign
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inBits
protected boolean inBits
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Constructor Detail
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Scanner
protected Scanner(Environment env) throws java.io.IOException
main constructor. Create a scanner to scan an input stream.- Throws:
java.io.IOException
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Method Detail
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scanModuleStatement
protected void scanModuleStatement() throws java.io.IOException
- Throws:
java.io.IOException
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scan
protected void scan() throws java.io.IOException
scan Scan the next token.- Throws:
java.io.IOException
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checkTokenIdent
protected final boolean checkTokenIdent()
Check the token may be identifier
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expect
protected final void expect(JasmTokens.Token t) throws Scanner.SyntaxError, java.io.IOException
Expects a token, scans the next token or throws an exception.- Throws:
Scanner.SyntaxError
java.io.IOException
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check
protected final void check(JasmTokens.Token t) throws Scanner.SyntaxError, java.io.IOException
Checks a token, throws an exception if not the same- Throws:
Scanner.SyntaxError
java.io.IOException
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isUCDigit
public static boolean isUCDigit(int ch)
Returns true if the character is a unicode digit.- Parameters:
ch
- the character to be checked
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isUCLetter
public static boolean isUCLetter(int ch)
Returns true if the character is a Unicode letter.- Parameters:
ch
- the character to be checked
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xscan
protected final void xscan() throws java.io.IOException
- Throws:
java.io.IOException
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