Lexical

java.lang.Object
- la.la.Lexical

public class Lexical
extends java.lang.Object

A stateful Lexical analyser, also see Syntax.

Field Summary

Fields
Modifier and Type	Field and Description
`static int`	`andSy` Integer codes for the various lexical symbols; also see `Symbol`.
`static int`	`charLiteral` Integer codes for the various lexical symbols; also see `Symbol`.
`static int`	`close` Integer codes for the various lexical symbols; also see `Symbol`.
`static int`	`colon` Integer codes for the various lexical symbols; also see `Symbol`.
`static int`	`comma` Integer codes for the various lexical symbols; also see `Symbol`.
`static int`	`consSy` Integer codes for the various lexical symbols; also see `Symbol`.
`static int`	`curlclose` Integer codes for the various lexical symbols; also see `Symbol`.
`static int`	`curlopen` Integer codes for the various lexical symbols; also see `Symbol`.
`static int`	`dot` Integer codes for the various lexical symbols; also see `Symbol`.
`static int`	`elseSy` Integer codes for the various lexical symbols; also see `Symbol`.
`static int`	`eofSy` Integer codes for the various lexical symbols; also see `Symbol`.
`static int`	`eq` Integer codes for the various lexical symbols; also see `Symbol`.
`static int`	`falseSy` Integer codes for the various lexical symbols; also see `Symbol`.
`static int`	`ge` Integer codes for the various lexical symbols; also see `Symbol`.
`static int`	`gt` Integer codes for the various lexical symbols; also see `Symbol`.
`static int`	`hdSy` Integer codes for the various lexical symbols; also see `Symbol`.
`static int`	`ifSy` Integer codes for the various lexical symbols; also see `Symbol`.
`protected java.io.InputStream`	`inp`
`static int`	`inSy` Integer codes for the various lexical symbols; also see `Symbol`.
`static int`	`lambdaSy` Integer codes for the various lexical symbols; also see `Symbol`.
`static int`	`le` Integer codes for the various lexical symbols; also see `Symbol`.
`static int`	`letSy` Integer codes for the various lexical symbols; also see `Symbol`.
`static int`	`lt` Integer codes for the various lexical symbols; also see `Symbol`.
`static int`	`minus` Integer codes for the various lexical symbols; also see `Symbol`.
`static int`	`ne` Integer codes for the various lexical symbols; also see `Symbol`.
`static int`	`nilSy` Integer codes for the various lexical symbols; also see `Symbol`.
`static int`	`notSy` Integer codes for the various lexical symbols; also see `Symbol`.
`static int`	`nullSy` Integer codes for the various lexical symbols; also see `Symbol`.
`static int`	`numeral` Integer codes for the various lexical symbols; also see `Symbol`.
`static int`	`numeralR` Integer codes for the various lexical symbols; also see `Symbol`.
`static int`	`open` Integer codes for the various lexical symbols; also see `Symbol`.
`static int`	`orSy` Integer codes for the various lexical symbols; also see `Symbol`.
`static int`	`over` Integer codes for the various lexical symbols; also see `Symbol`.
`static int`	`plus` Integer codes for the various lexical symbols; also see `Symbol`.
`static int`	`recSy` Integer codes for the various lexical symbols; also see `Symbol`.
`static int`	`sqclose` Integer codes for the various lexical symbols; also see `Symbol`.
`static int`	`sqopen` Integer codes for the various lexical symbols; also see `Symbol`.
`static int`	`stringLiteral` Integer codes for the various lexical symbols; also see `Symbol`.
`static java.lang.String[]`	`Symbol` String representations of the various lexical symbols.
`static int`	`thenSy` Integer codes for the various lexical symbols; also see `Symbol`.
`static int`	`times` Integer codes for the various lexical symbols; also see `Symbol`.
`static int`	`tlSy` Integer codes for the various lexical symbols; also see `Symbol`.
`static int`	`triv` Integer codes for the various lexical symbols; also see `Symbol`.
`static int`	`trueSy` Integer codes for the various lexical symbols; also see `Symbol`.
`static int`	`word` Integer codes for the various lexical symbols; also see `Symbol`.

Constructor Summary

Constructors
Constructor and Description

Lexical(java.io.InputStream inp)
Construct a Lexical analyser of a source InputStream, 'inp'.

Constructors
Constructor and Description
`Lexical(java.io.InputStream inp)` Construct a Lexical analyser of a source InputStream, 'inp'.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`boolean`	`eoi()` Is this Lexical at its 'end of input', or not?
`void`	`error(java.lang.String msg)` Print an error message, msg, and stop.
`static Lexical`	`forFile(java.io.File file)` Return a Lexical analyser of a source File, 'file'.
`static Lexical`	`forFile(java.lang.String fn)` Return a Lexical analyser of a source File named 'fn'.
`static Lexical`	`forString(java.lang.String str)` Return a Lexical analyser of a source String, 'str'.
`protected void`	`getch()` Note, getch() changes the state variables, including 'ch', as a side-effect.
`void`	`insymbol()` Get the next `symbol`, from the InputStream 'inp'.
`static java.lang.String`	`int2sy(int n)` Return the n-th Lexical Symbol as a String, if possible.
`boolean`	`lines1stSy()` Is the current input symbol, the first one on the line?
`static void`	`main(java.lang.String[] argv)` main() allows Lexical to be tested, a little, in isolation, for example java ...Lexical < inputfile
`java.lang.String`	`skipRest()` `Skip`, and return, up to a "few" remaining input lines and characters.
`java.lang.String`	`skipRest(int maxLines, int maxChars)` Skip, and return, the rest of the input up to the limits 'maxLines' lines and 'maxChars' characters.
`int`	`sy()` Return the kind of the current input symbol.
`java.lang.String`	`syInfo()` Return a String representation of the current `symbol`, e.g., for debugging or tracing purposes.
`double`	`theAcc()` Return the supposed precision of the real-valued numeral, if any.
`double`	`theDbl()` Return the current real-valued numeral, if any.
`int`	`theInt()` Return the current integer numeral, if any.
`java.lang.String`	`theWord()` Return the current word (identifier or keyword), if any.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - inp
```
protected final java.io.InputStream inp
```
  - word
```
public static final int word
```
    Integer codes for the various lexical symbols; also see Symbol.
    
    See Also:
    
    Constant Field Values
  - numeral
```
public static final int numeral
```
    Integer codes for the various lexical symbols; also see Symbol.
    
    See Also:
    
    Constant Field Values
  - numeralR
```
public static final int numeralR
```
    Integer codes for the various lexical symbols; also see Symbol.
    
    See Also:
    
    Constant Field Values
  - charLiteral
```
public static final int charLiteral
```
    Integer codes for the various lexical symbols; also see Symbol.
    
    See Also:
    
    Constant Field Values
  - stringLiteral
```
public static final int stringLiteral
```
    Integer codes for the various lexical symbols; also see Symbol.
    
    See Also:
    
    Constant Field Values
  - triv
```
public static final int triv
```
    Integer codes for the various lexical symbols; also see Symbol.
    
    See Also:
    
    Constant Field Values
  - nilSy
```
public static final int nilSy
```
    Integer codes for the various lexical symbols; also see Symbol.
    
    See Also:
    
    Constant Field Values
  - trueSy
```
public static final int trueSy
```
    Integer codes for the various lexical symbols; also see Symbol.
    
    See Also:
    
    Constant Field Values
  - falseSy
```
public static final int falseSy
```
    Integer codes for the various lexical symbols; also see Symbol.
    
    See Also:
    
    Constant Field Values
  - open
```
public static final int open
```
    Integer codes for the various lexical symbols; also see Symbol.
    
    See Also:
    
    Constant Field Values
  - close
```
public static final int close
```
    Integer codes for the various lexical symbols; also see Symbol.
    
    See Also:
    
    Constant Field Values
  - sqopen
```
public static final int sqopen
```
    Integer codes for the various lexical symbols; also see Symbol.
    
    See Also:
    
    Constant Field Values
  - sqclose
```
public static final int sqclose
```
    Integer codes for the various lexical symbols; also see Symbol.
    
    See Also:
    
    Constant Field Values
  - curlopen
```
public static final int curlopen
```
    Integer codes for the various lexical symbols; also see Symbol.
    
    See Also:
    
    Constant Field Values
  - curlclose
```
public static final int curlclose
```
    Integer codes for the various lexical symbols; also see Symbol.
    
    See Also:
    
    Constant Field Values
  - letSy
```
public static final int letSy
```
    Integer codes for the various lexical symbols; also see Symbol.
    
    See Also:
    
    Constant Field Values
  - recSy
```
public static final int recSy
```
    Integer codes for the various lexical symbols; also see Symbol.
    
    See Also:
    
    Constant Field Values
  - inSy
```
public static final int inSy
```
    Integer codes for the various lexical symbols; also see Symbol.
    
    See Also:
    
    Constant Field Values
  - comma
```
public static final int comma
```
    Integer codes for the various lexical symbols; also see Symbol.
    
    See Also:
    
    Constant Field Values
  - colon
```
public static final int colon
```
    Integer codes for the various lexical symbols; also see Symbol.
    
    See Also:
    
    Constant Field Values
  - ifSy
```
public static final int ifSy
```
    Integer codes for the various lexical symbols; also see Symbol.
    
    See Also:
    
    Constant Field Values
  - thenSy
```
public static final int thenSy
```
    Integer codes for the various lexical symbols; also see Symbol.
    
    See Also:
    
    Constant Field Values
  - elseSy
```
public static final int elseSy
```
    Integer codes for the various lexical symbols; also see Symbol.
    
    See Also:
    
    Constant Field Values
  - lambdaSy
```
public static final int lambdaSy
```
    Integer codes for the various lexical symbols; also see Symbol.
    
    See Also:
    
    Constant Field Values
  - dot
```
public static final int dot
```
    Integer codes for the various lexical symbols; also see Symbol.
    
    See Also:
    
    Constant Field Values
  - consSy
```
public static final int consSy
```
    Integer codes for the various lexical symbols; also see Symbol.
    
    See Also:
    
    Constant Field Values
  - orSy
```
public static final int orSy
```
    Integer codes for the various lexical symbols; also see Symbol.
    
    See Also:
    
    Constant Field Values
  - andSy
```
public static final int andSy
```
    Integer codes for the various lexical symbols; also see Symbol.
    
    See Also:
    
    Constant Field Values
  - eq
```
public static final int eq
```
    Integer codes for the various lexical symbols; also see Symbol.
    
    See Also:
    
    Constant Field Values
  - ne
```
public static final int ne
```
    Integer codes for the various lexical symbols; also see Symbol.
    
    See Also:
    
    Constant Field Values
  - lt
```
public static final int lt
```
    Integer codes for the various lexical symbols; also see Symbol.
    
    See Also:
    
    Constant Field Values
  - le
```
public static final int le
```
    Integer codes for the various lexical symbols; also see Symbol.
    
    See Also:
    
    Constant Field Values
  - gt
```
public static final int gt
```
    Integer codes for the various lexical symbols; also see Symbol.
    
    See Also:
    
    Constant Field Values
  - ge
```
public static final int ge
```
    Integer codes for the various lexical symbols; also see Symbol.
    
    See Also:
    
    Constant Field Values
  - plus
```
public static final int plus
```
    Integer codes for the various lexical symbols; also see Symbol.
    
    See Also:
    
    Constant Field Values
  - minus
```
public static final int minus
```
    Integer codes for the various lexical symbols; also see Symbol.
    
    See Also:
    
    Constant Field Values
  - times
```
public static final int times
```
    Integer codes for the various lexical symbols; also see Symbol.
    
    See Also:
    
    Constant Field Values
  - over
```
public static final int over
```
    Integer codes for the various lexical symbols; also see Symbol.
    
    See Also:
    
    Constant Field Values
  - nullSy
```
public static final int nullSy
```
    Integer codes for the various lexical symbols; also see Symbol.
    
    See Also:
    
    Constant Field Values
  - hdSy
```
public static final int hdSy
```
    Integer codes for the various lexical symbols; also see Symbol.
    
    See Also:
    
    Constant Field Values
  - tlSy
```
public static final int tlSy
```
    Integer codes for the various lexical symbols; also see Symbol.
    
    See Also:
    
    Constant Field Values
  - notSy
```
public static final int notSy
```
    Integer codes for the various lexical symbols; also see Symbol.
    
    See Also:
    
    Constant Field Values
  - eofSy
```
public static final int eofSy
```
    Integer codes for the various lexical symbols; also see Symbol.
    
    See Also:
    
    Constant Field Values
  - Symbol
```
public static final java.lang.String[] Symbol
```
    String representations of the various lexical symbols.
- Constructor Detail
  - Lexical
```
public Lexical(java.io.InputStream inp)
```
    Construct a Lexical analyser of a source InputStream, 'inp'. Also see forString(java.lang.String) and forFile(File).
- Method Detail
  - int2sy
```
public static java.lang.String int2sy(int n)
```
    Return the n-th Lexical Symbol as a String, if possible.
  - forString
```
public static Lexical forString(java.lang.String str)
```
    Return a Lexical analyser of a source String, 'str'.
  - forFile
```
public static Lexical forFile(java.io.File file)
```
    Return a Lexical analyser of a source File, 'file'. Also see forFile(String).
  - forFile
```
public static Lexical forFile(java.lang.String fn)
```
    Return a Lexical analyser of a source File named 'fn'. Also see forFile(File).
  - sy
```
public int sy()
```
    Return the kind of the current input symbol.
  - syInfo
```
public java.lang.String syInfo()
```
    Return a String representation of the current symbol, e.g., for debugging or tracing purposes.
  - lines1stSy
```
public boolean lines1stSy()
```
    Is the current input symbol, the first one on the line?
  - eoi
```
public boolean eoi()
```
    Is this Lexical at its 'end of input', or not?
  - theWord
```
public java.lang.String theWord()
```
    Return the current word (identifier or keyword), if any.
  - theInt
```
public int theInt()
```
    Return the current integer numeral, if any.
  - theDbl
```
public double theDbl()
```
    Return the current real-valued numeral, if any.
  - theAcc
```
public double theAcc()
```
    Return the supposed precision of the real-valued numeral, if any.
  - insymbol
```
public void insymbol()
```
    Get the next symbol, from the InputStream 'inp'.
  - getch
```
protected void getch()
```
    Note, getch() changes the state variables, including 'ch', as a side-effect.
  - skipRest
```
public java.lang.String skipRest()
```
    Skip, and return, up to a "few" remaining input lines and characters.
  - skipRest
```
public java.lang.String skipRest(int maxLines,
                                 int maxChars)
```
    Skip, and return, the rest of the input up to the limits 'maxLines' lines and 'maxChars' characters. Note, returns all characters if maxLines and maxChars are both negative.
  - error
```
public void error(java.lang.String msg)
```
    Print an error message, msg, and stop.
  - main
```
public static void main(java.lang.String[] argv)
```
    main() allows Lexical to be tested, a little, in isolation, for example java ...Lexical < inputfile

Class Lexical

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

inp

word

numeral

numeralR

charLiteral

stringLiteral

triv

nilSy

trueSy

falseSy

open

close

sqopen

sqclose

curlopen

curlclose

letSy

recSy

inSy

comma

colon

ifSy

thenSy

elseSy

lambdaSy

dot

consSy

orSy

andSy

eq

ne

lt

le

gt

ge

plus

minus

times

over

nullSy

hdSy

tlSy

notSy

eofSy

Symbol

Constructor Detail

Lexical

Method Detail

int2sy

forString

forFile

forFile

sy

syInfo

lines1stSy

eoi

theWord

theInt

theDbl

theAcc

insymbol

getch

skipRest

skipRest

error

main