ExpressionParser

java.lang.Object
- uk.ac.ed.epcc.safe.accounting.expr.parse.ExpressionParser

public class ExpressionParser
extends java.lang.Object

Nested Class Summary

Nested Classes
Modifier and Type Class and Description

static interface ExpressionParser.Lexer
Communication interface between the scanner and the Bison-generated parser ExpressionParser.

Nested Classes
Modifier and Type	Class and Description
`static interface`	`ExpressionParser.Lexer` Communication interface between the scanner and the Bison-generated parser `ExpressionParser`.

Field Summary

Fields
Modifier and Type	Field and Description
`static java.lang.String`	`bisonSkeleton` Name of the skeleton that generated this parser.
`static java.lang.String`	`bisonVersion` Version number for the Bison executable that generated this parser.
`static int`	`COMMA` Token number, to be returned by the scanner.
`static int`	`DIV` Token number, to be returned by the scanner.
`static int`	`EOF` Token returned by the scanner to signal the end of its input.
`boolean`	`errorVerbose` True if verbose error messages are enabled.
`static int`	`KEYWORD` Token number, to be returned by the scanner.
`static int`	`LBRACE` Token number, to be returned by the scanner.
`static int`	`LPAREN` Token number, to be returned by the scanner.
`static int`	`LSQR` Token number, to be returned by the scanner.
`static int`	`MINUS` Token number, to be returned by the scanner.
`static int`	`MULT` Token number, to be returned by the scanner.
`static int`	`NEG` Token number, to be returned by the scanner.
`static int`	`NUMBER` Token number, to be returned by the scanner.
`static int`	`PLUS` Token number, to be returned by the scanner.
`static int`	`PROPTAG` Token number, to be returned by the scanner.
`static int`	`RBRACE` Token number, to be returned by the scanner.
`static int`	`RPAREN` Token number, to be returned by the scanner.
`static int`	`RSQR` Token number, to be returned by the scanner.
`static int`	`STRING` Token number, to be returned by the scanner.
`static int`	`YYABORT` Returned by a Bison action in order to stop the parsing process and return failure (`false`).
`static int`	`YYACCEPT` Returned by a Bison action in order to stop the parsing process and return success (`true`).
`static int`	`YYERROR` Returned by a Bison action in order to start error recovery without printing an error message.
`static int`	`YYFAIL` Returned by a Bison action in order to print an error message and start error recovery.

Constructor Summary

Constructors
Constructor and Description

ExpressionParser(ExpressionParser.Lexer yylexer)
Instantiates the Bison-generated parser.

Constructors
Constructor and Description
`ExpressionParser(ExpressionParser.Lexer yylexer)` Instantiates the Bison-generated parser.

Method Summary

Methods
Modifier and Type	Method and Description
`int`	`getDebugLevel()` Answer the verbosity of the debugging output; 0 means that all kinds of output from the parser are suppressed.
`java.io.PrintStream`	`getDebugStream()` Return the `PrintStream` on which the debugging output is printed.
`PropExpression`	`getExpression()`
`void`	`init(uk.ac.ed.epcc.webapp.AppContext conn, PropertyFinder finder)`
`boolean`	`parse()` Parse input from the scanner that was specified at object construction time.
`boolean`	`recovering()` Return whether error recovery is being done.
`void`	`setDebugLevel(int level)` Set the verbosity of the debugging output; 0 means that all kinds of output from the parser are suppressed.
`void`	`setDebugStream(java.io.PrintStream s)` Set the `PrintStream` on which the debug output is printed.
`protected void`	`yycdebug(java.lang.String s)`
`protected void`	`yyerror(java.lang.String s)`

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

- Field Detail
  - bisonVersion
```
public static final java.lang.String bisonVersion
```
    Version number for the Bison executable that generated this parser.
    
    See Also:
    Constant Field Values
  - bisonSkeleton
```
public static final java.lang.String bisonSkeleton
```
    Name of the skeleton that generated this parser.
    
    See Also:
    Constant Field Values
  - errorVerbose
```
public boolean errorVerbose
```
    True if verbose error messages are enabled.
  - EOF
```
public static final int EOF
```
    Token returned by the scanner to signal the end of its input.
    
    See Also:
    Constant Field Values
  - NUMBER
```
public static final int NUMBER
```
    Token number, to be returned by the scanner.
    
    See Also:
    Constant Field Values
  - MULT
```
public static final int MULT
```
    Token number, to be returned by the scanner.
    
    See Also:
    Constant Field Values
  - DIV
```
public static final int DIV
```
    Token number, to be returned by the scanner.
    
    See Also:
    Constant Field Values
  - PLUS
```
public static final int PLUS
```
    Token number, to be returned by the scanner.
    
    See Also:
    Constant Field Values
  - MINUS
```
public static final int MINUS
```
    Token number, to be returned by the scanner.
    
    See Also:
    Constant Field Values
  - LPAREN
```
public static final int LPAREN
```
    Token number, to be returned by the scanner.
    
    See Also:
    Constant Field Values
  - RPAREN
```
public static final int RPAREN
```
    Token number, to be returned by the scanner.
    
    See Also:
    Constant Field Values
  - LBRACE
```
public static final int LBRACE
```
    Token number, to be returned by the scanner.
    
    See Also:
    Constant Field Values
  - RBRACE
```
public static final int RBRACE
```
    Token number, to be returned by the scanner.
    
    See Also:
    Constant Field Values
  - LSQR
```
public static final int LSQR
```
    Token number, to be returned by the scanner.
    
    See Also:
    Constant Field Values
  - RSQR
```
public static final int RSQR
```
    Token number, to be returned by the scanner.
    
    See Also:
    Constant Field Values
  - PROPTAG
```
public static final int PROPTAG
```
    Token number, to be returned by the scanner.
    
    See Also:
    Constant Field Values
  - STRING
```
public static final int STRING
```
    Token number, to be returned by the scanner.
    
    See Also:
    Constant Field Values
  - COMMA
```
public static final int COMMA
```
    Token number, to be returned by the scanner.
    
    See Also:
    Constant Field Values
  - KEYWORD
```
public static final int KEYWORD
```
    Token number, to be returned by the scanner.
    
    See Also:
    Constant Field Values
  - NEG
```
public static final int NEG
```
    Token number, to be returned by the scanner.
    
    See Also:
    Constant Field Values
  - YYACCEPT
```
public static final int YYACCEPT
```
    Returned by a Bison action in order to stop the parsing process and return success (true).
    
    See Also:
    Constant Field Values
  - YYABORT
```
public static final int YYABORT
```
    Returned by a Bison action in order to stop the parsing process and return failure (false).
    
    See Also:
    Constant Field Values
  - YYERROR
```
public static final int YYERROR
```
    Returned by a Bison action in order to start error recovery without printing an error message.
    
    See Also:
    Constant Field Values
  - YYFAIL
```
public static final int YYFAIL
```
    Returned by a Bison action in order to print an error message and start error recovery. Formally deprecated in Bison 2.4.2's NEWS entry, where a plan to phase it out is discussed.
    
    See Also:
    Constant Field Values
- Constructor Detail
  - ExpressionParser
```
public ExpressionParser(ExpressionParser.Lexer yylexer)
```
    Instantiates the Bison-generated parser.
    
    Parameters:
    yylexer - The scanner that will supply tokens to the parser.
- Method Detail
  - getDebugStream
```
public final java.io.PrintStream getDebugStream()
```
    Return the PrintStream on which the debugging output is printed.
    
    Returns:
    PrintStream
  - setDebugStream
```
public final void setDebugStream(java.io.PrintStream s)
```
    Set the PrintStream on which the debug output is printed.
    
    Parameters:
    s - The stream that is used for debugging output.
  - getDebugLevel
```
public final int getDebugLevel()
```
    Answer the verbosity of the debugging output; 0 means that all kinds of output from the parser are suppressed.
    
    Returns:
    debug level
  - setDebugLevel
```
public final void setDebugLevel(int level)
```
    Set the verbosity of the debugging output; 0 means that all kinds of output from the parser are suppressed.
    
    Parameters:
    level - The verbosity level for debugging output.
  - yyerror
```
protected final void yyerror(java.lang.String s)
```
  - yycdebug
```
protected final void yycdebug(java.lang.String s)
```
  - recovering
```
public final boolean recovering()
```
    Return whether error recovery is being done. In this state, the parser reads token until it reaches a known state, and then restarts normal operation.
    
    Returns:
    status
  - parse
```
public boolean parse()
              throws LexException,
                     java.lang.Exception
```
    Parse input from the scanner that was specified at object construction time. Return whether the end of the input was reached successfully.
    
    Throws:
    
    LexException
    
    java.lang.Exception
    
    Returns:
    true if the parsing succeeds. Note that this does not imply that there were no syntax errors.
  - init
```
public void init(uk.ac.ed.epcc.webapp.AppContext conn,
        PropertyFinder finder)
```
  - getExpression
```
public PropExpression getExpression()
```

Class ExpressionParser

Nested Class Summary

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

bisonVersion

bisonSkeleton

errorVerbose

EOF

NUMBER

MULT

DIV

PLUS

MINUS

LPAREN

RPAREN

LBRACE

RBRACE

LSQR

RSQR

PROPTAG

STRING

COMMA

KEYWORD

NEG

YYACCEPT

YYABORT

YYERROR

YYFAIL

Constructor Detail

ExpressionParser

Method Detail

getDebugStream

setDebugStream

getDebugLevel

setDebugLevel

yyerror

yycdebug

recovering

parse

init

getExpression