ix.util.match
Class SimpleMatcher

java.lang.Object
  ix.util.match.SimpleMatcher

public final class SimpleMatcher
extends java.lang.Object

A simple pattern-matcher.

Field Summary

static MatchEnv	emptyEnv emptyEnv is used to return non-null without allocating an env.
static Symbol	OPTIONAL
static Symbol	REST

Constructor Summary

SimpleMatcher()

Method Summary

static void	main(java.lang.String[] argv)
static MatchEnv	match(java.lang.Object pat, java.lang.Object dat) Match tries to match a pattern against an object.
static MatchEnv	match(java.lang.Object pat, java.lang.Object dat, MatchEnv env)
static MatchEnv	matchAnyPattern(java.util.List patterns, java.lang.Object data)
static MatchEnv	matchAnyValue(java.lang.Object pat, java.util.List dataValues)
static MatchEnv	mustMatch(java.lang.Object pat, java.lang.Object dat)
static MatchEnv	mustMatch(java.lang.Object pat, java.lang.Object dat, MatchEnv env)

Methods inherited from class java.lang.Object

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

Field Detail

emptyEnv

public static final MatchEnv emptyEnv

emptyEnv is used to return non-null without allocating an env.

REST

public static final Symbol REST

OPTIONAL

public static final Symbol OPTIONAL

Constructor Detail

SimpleMatcher

public SimpleMatcher()

Method Detail

mustMatch

public static final MatchEnv mustMatch(java.lang.Object pat,
                                       java.lang.Object dat)

mustMatch

public static final MatchEnv mustMatch(java.lang.Object pat,
                                       java.lang.Object dat,
                                       MatchEnv env)

matchAnyPattern

public static final MatchEnv matchAnyPattern(java.util.List patterns,
                                             java.lang.Object data)

matchAnyValue

public static final MatchEnv matchAnyValue(java.lang.Object pat,
                                           java.util.List dataValues)

match

public static final MatchEnv match(java.lang.Object pat,
                                   java.lang.Object dat)

Match tries to match a pattern against an object.

Only ItemVars are treated as variables, and even then only if they appear in the pattern. Otherwise, they are treated as data. If a variable appears more than once in a pattern, the objects it matches must be equal.

Numbers are compared using equal.

Returns:

a MatchEnv or null.

See Also:

MatchEnv, ItemVar

match

public static final MatchEnv match(java.lang.Object pat,
                                   java.lang.Object dat,
                                   MatchEnv env)

main

public static void main(java.lang.String[] argv)