edu.ucsb.cs56.pconrad.parsing.parser

Class ParseAdditiveOrMultiplicative

java.lang.Object

edu.ucsb.cs56.pconrad.parsing.parser.ParseAdditiveOrMultiplicative

public abstract class ParseAdditiveOrMultiplicative
extends Object

Observation: the only differences between parseMultiplicateExpression and parseAdditiveExpression (both private to Parser) are:

1. which method is called internally to parse the nested expressions
2. which method is called internally to parse the operator in play

As such, we factor out this commonality into a class that treats these above two methods as abstract, and implements the functionality in terms of these abstract methods.

See Also:

Parser

Constructor Summary

Constructors

Constructor and Description
ParseAdditiveOrMultiplicative()

Method Summary

Modifier and Type	Method and Description
abstract ParseResult<AST>	parseBase(int pos) The "base" thing to parse, that is, the component that parses nested expressions.
ParseResult<AST>	parseExp(int pos) Actually parses in the expression, using parseBase and parseOp in the process.
abstract ParseResult<Operator>	parseOp(int pos) Parser for the operator in play.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ParseAdditiveOrMultiplicative

public ParseAdditiveOrMultiplicative()

Method Detail

parseBase

public abstract ParseResult<AST> parseBase(int pos)
                                    throws ParserException

The "base" thing to parse, that is, the component that parses nested expressions.

Parameters:

pos - The position in the input where we start parsing

Returns:

a result encapsulating the parsed in AST

Throws:

ParserException - when there is a syntax error

parseOp

public abstract ParseResult<Operator> parseOp(int pos)
                                       throws ParserException

Parser for the operator in play.

Parameters:

pos - The position in the input where we start parsing

Returns:

a result encapsulating the operator parsed in

Throws:

ParserException - when there is a syntax error

parseExp

public ParseResult<AST> parseExp(int pos)
                          throws ParserException

Actually parses in the expression, using parseBase and parseOp in the process.

Parameters:

pos - The position in the input where we start parsing

Returns:

a result encapsulating the overall AST parsed in

Throws:

ParserException - if there is a syntax error