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Java Source Code / Java Documentation » Parser » runcc » fri.patterns.interpreter.parsergenerator.lexer 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   fri.patterns.interpreter.parsergenerator.lexer.Strategy

Strategy
public class Strategy implements Serializable(Code)
Strategy is the way how alternative concurrent character consumers are applied to input. It is used by LexerImpl and ConsumerAlternatives. There are consumers that have a fixed start character and others that have not. Consumers have different length of fixed start sequences. Some consumers have a fixed length to scan, others (with repeatable rules) have not. Consumers differ in their character sets, some having many possible characters, others lesser, some sets might overlap those of other consumers. Last but not least the Parser gives hints about currently expected tokens.

Following is the strategy implemented here:

  • Divide consumers in two groups: those with fixed start character and those without.
  • Sort both consumers groups by
    1. by the variance of their start character (which may be a set), the less the better
    2. their start sequence length (ends before first repeatable character), the longer the better
    3. by their fixed start length (ends before first character set), the longer the better.
    Sorting is done by Consumer implements Comparable
  • The lookahead character chooses consumers with fixed start character.
  • If one matches, overlapping consumers without fixed start character are tried, when one scans longer, it wins.
  • If none matches, consumers without fixed start character are tried, by sort order.
  • If one matches, overlapping consumers without fixed start character are tried, when one scans longer, it wins.

author:
   Fritz Ritzberger

Inner Class :public static class Item implements Comparable,Serializable



Method Summary
public  voidaddIgnoringConsumer(String symbol, Consumer cc)
     Adds a Consumer to list of possible consumers.
public  voidaddTokenConsumer(String symbol, Consumer cc)
     Adds a Consumer to list of possible consumers producing valid tokens.
public  Itemconsume(InputText input, int lookahead, Map expectedTokenSymbols)
     Liefert null wenn kein consumer den input lesen kann, sonst den laengstmoeglichen gescannten Text.
public  booleanhasTerminal(String terminal)
     Returns true if the passed terminal is already in list.
public  voidsetCompeteForLongestInput(boolean competeForLongestInput)
    
public  StringtoString()
     Returns a human readable representation of the lists and maps within this strategy.



Method Detail
addIgnoringConsumer
public void addIgnoringConsumer(String symbol, Consumer cc)(Code)
Adds a Consumer to list of possible consumers. This consumer will read input to be ignored by the parser.



addTokenConsumer
public void addTokenConsumer(String symbol, Consumer cc)(Code)
Adds a Consumer to list of possible consumers producing valid tokens.



consume
public Item consume(InputText input, int lookahead, Map expectedTokenSymbols) throws IOException(Code)
Liefert null wenn kein consumer den input lesen kann, sonst den laengstmoeglichen gescannten Text.
Parameters:
  input - the input to read from
Parameters:
  lookahead - the first byte or character from input
Parameters:
  expectedTokenSymbols - expected token symbols (in key enumeration), can be null



hasTerminal
public boolean hasTerminal(String terminal)(Code)
Returns true if the passed terminal is already in list.



setCompeteForLongestInput
public void setCompeteForLongestInput(boolean competeForLongestInput)(Code)



toString
public String toString()(Code)
Returns a human readable representation of the lists and maps within this strategy.



Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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