PerCederberg.Grammatica.Parser
Class RegExpTokenMatcher

System.Object
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   +--TokenMatcher
         |
         +--RegExpTokenMatcher

class RegExpTokenMatcher

extends TokenMatcher

A regular expression token pattern matcher. This class is used to match a single regular expression with the tokenizer buffer. This class also maintains the state of the last match.

RegExpTokenMatcher

public RegExpTokenMatcher( TokenPattern pattern );

Creates a new regular expression token matcher.

Parameters:

pattern - the pattern to match

Throws:

RegExpException - if the regular expression couldn't be created properly

GetMatchedLength

public override int GetMatchedLength();

Returns the length of the latest match.

Returns:

the length of the latest match, or zero (0) if no match found

GetMatchedPattern

public override TokenPattern GetMatchedPattern();

Returns the latest matched token pattern.

Returns:

the latest matched token pattern, or null if no match found

GetPattern

public TokenPattern GetPattern();

Returns the token pattern.

Returns:

the token pattern

HasReadEndOfString

public override bool HasReadEndOfString();

Checks if the end of string was encountered during the last match.

Returns:

true if the end of string was reached, or false otherwise

MatchFrom

public bool MatchFrom( string str, int pos );

Checks if the token pattern matches the tokenizer buffer from the specified position. This method will also reset all flags in this matcher.

Parameters:

str - the string to match

pos - the starting position

Returns:

true if a match was found, or false otherwise

Start

public int Start();

Returns the start position of the latest match.

Returns:

the start position of the last match, or zero (0) if none found

ToString

public override string ToString();

Returns a string representation of this token matcher.

Returns:

a detailed string representation of this matcher