Package com.singularsys.jep.misc.dictionary

Class DictionaryGrammarMatcher

java.lang.Object

com.singularsys.jep.misc.dictionary.DictionaryGrammarMatcher

All Implemented Interfaces:

GrammarMatcher, Serializable

public class DictionaryGrammarMatcher
extends Object
implements GrammarMatcher

A GrammarMatcher for JSON like map syntax.

map = {'x':2, 'y':3}

On parsing this produces an ASTOpNode with the MapPfmc, each child is another ASTOpNode with the MapPfmc.MapEntryPfmc and two children, the key and value.

Since:

Jep 4.1

See Also:

• Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static enum	DictionaryGrammarMatcher.Type	Type of matcher.

Field Summary

Fields

Modifier and Type	Field	Description
final DictionaryGrammarMatcher.Type	type

Constructor Summary

Constructors

Constructor	Description
DictionaryGrammarMatcher(DictionaryGrammarMatcher.Type type, Token open, Token close, Token colon, Token comma, Operator dict, Operator entry)	Create a DictionaryGrammarMatcher

Method Summary

Modifier and Type	Method	Description
void	init(Jep jep)	Delayed initialisation, this method is called whenever components of the jep instance are changed.
Node	match(Lookahead2Iterator<Token> it, GrammarParser parser)	Attempt to match a function, calls the GrammarParser.parseSubExpression() to match function arguments.

Methods inherited from class java.lang.Object

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

Field Details

type

public final DictionaryGrammarMatcher.Type type

Constructor Details

DictionaryGrammarMatcher

public DictionaryGrammarMatcher(DictionaryGrammarMatcher.Type type,
 Token open,
 Token close,
 Token colon,
 Token comma,
 Operator dict,
 Operator entry)

Create a DictionaryGrammarMatcher

Parameters:

open - token representing an opening bracket

close - token representing a closing bracket

colon - token representing the key value separator

comma - token representing a list item separator

dict - the operator used for creating maps

entry - the operator used for creating map entries

Method Details

init

public void init(Jep jep)

Description copied from interface: GrammarMatcher

Delayed initialisation, this method is called whenever components of the jep instance are changed.

Specified by:

init in interface GrammarMatcher

Parameters:

jep - the current jep instance.

match

public Node match(Lookahead2Iterator<Token> it,
 GrammarParser parser)
           throws ParseException

Attempt to match a function, calls the GrammarParser.parseSubExpression() to match function arguments.

Specified by:

match in interface GrammarMatcher

Parameters:

it - An iterator inspecting the input

parser - the parser to use when evaluating sub expressions

Returns:

if matched returns a node representing the content, return null is does not match

Throws:

ParseException - if there is a syntactical error in the input.