Package com.scriptbasic.interfaces

Interface LexicalElementAnalyzer

All Known Implementing Classes:
AbstractElementAnalyzer, BasicString, ConstAwareIdentifier, Decimal, Identifier, MultiCharacter, OneCharacter
public interface LexicalElementAnalyzer
A Lexical Element Analyzer analyzes the characters coming from a reader and create a LexicalElement from it. If it can not create a lexical element then it pushes back all characters read into the reader and the method read() returns with null.

There are implementation of this interface to recognize string, symbol, identifier, decimal number.

Author:
Peter Verhas

  • Method Summary

    Modifier and Type
    Method
    Description
    LexicalElement
    read()
    Reads a lexeme and returns the created lexical element.

  • Method Details

    • read

      LexicalElement read() throws AnalysisException
      Reads a lexeme and returns the created lexical element.

      If the characters read from the reader show that the lexeme is not the type that the class implementing this interface can handle then the characters are pushed back to he reader and null is returned.

      If the characters read from the reader show that the lexeme is the type that the class implementing this interface can handle, but is erroneous, then the method throws the exception.

      Returns:
      the created lexeme or null
      Throws:
      AnalysisException - in case of exception