Package com.prineside.luaj

Class LuaString

java.lang.Object

com.prineside.luaj.Varargs

com.prineside.luaj.LuaValue

com.prineside.luaj.LuaString

All Implemented Interfaces:

com.esotericsoftware.kryo.KryoSerializable

public final class LuaString
extends LuaValue
implements com.esotericsoftware.kryo.KryoSerializable

Subclass of LuaValue for representing lua strings.

Because lua string values are more nearly sequences of bytes than sequences of characters or unicode code points, the LuaString implementation holds the string value in an internal byte array.

LuaString values are not considered mutable once constructed, so multiple LuaString values can chare a single byte array.

Currently LuaStrings are pooled via a centrally managed weak table. To ensure that as many string values as possible take advantage of this, Constructors are not exposed directly. As with number, booleans, and nil, instance construction should be via LuaValue.valueOf(byte[]) or similar API.

Because of this pooling, users of LuaString must not directly alter the bytes in a LuaString, or undefined behavior will result.

When Java Strings are used to initialize LuaString data, the UTF8 encoding is assumed. The functions lengthAsUtf8(char[]), encodeToUtf8(char[], int, byte[], int), and decodeAsUtf8(byte[], int, int) are used to convert back and forth between UTF8 byte arrays and character arrays.

See Also:

• LuaValue
• LuaValue.valueOf(String)
• LuaValue.valueOf(byte[])

Nested Class Summary

Nested classes/interfaces inherited from class com.prineside.luaj.LuaValue

LuaValue.NillableSerializer, LuaValue.None

Nested classes/interfaces inherited from class com.prineside.luaj.Varargs

Varargs.ArrayVarargs

Field Summary

Fields

Modifier and Type	Field	Description
byte[]	m_bytes	The bytes for the string.
int	m_length	The number of bytes that comprise this string
int	m_offset	The offset into the byte array, 0 means start at the first byte
static LuaValue	s_metatable	The singleton instance for string metatables that forwards to the string functions.

Fields inherited from class com.prineside.luaj.LuaValue

ADD, CALL, CONCAT, DIV, EMPTYSTRING, ENV, EQ, FALSE, INDEX, LE, LEN, LT, METATABLE, MINUSONE, MOD, MODE, MUL, NEWINDEX, NIL, NILLABLE_SERIALIZER, NILS, NONE, NOVALS, ONE, POW, SUB, TBOOLEAN, TFUNCTION, TINT, TLIGHTUSERDATA, TNIL, TNONE, TNUMBER, TOSTRING, TRUE, TSTRING, TTABLE, TTHREAD, TUSERDATA, TVALUE, TYPE_NAMES, UNM, ZERO

Method Summary

Modifier and Type	Method	Description
LuaValue	add(double rhs)	Add: Perform numeric add operation with another value of double type with metatag processing
LuaValue	add(int rhs)	Add: Perform numeric add operation with another value of int type with metatag processing
LuaValue	add(LuaValue rhs)	Add: Perform numeric add operation with another value including metatag processing.
int	charAt(int index)
double	checkdouble()	Check that the value is numeric and return the value as a double, or throw LuaError if not numeric
int	checkint()	Check that the value is numeric, and convert and cast value to int, or throw LuaError if not numeric
String	checkjstring()	Convert this value to a Java String.
long	checklong()	Check that the value is numeric, and convert and cast value to long, or throw LuaError if not numeric
LuaNumber	checknumber()	Check that the value is numeric, and return as a LuaNumber if so, or throw LuaError
LuaNumber	checknumber(String msg)	Check that the value is numeric, and return as a LuaNumber if so, or throw LuaError
LuaString	checkstring()	Check that this is a lua string, or throw LuaError if it is not.
Buffer	concat(Buffer rhs)	Concatenate a Buffer onto this value and return the result using rules of lua string concatenation including metatag processing.
LuaValue	concat(LuaValue rhs)	Concatenate another value onto this value and return the result using rules of lua string concatenation including metatag processing.
LuaValue	concatTo(LuaNumber lhs)	Reverse-concatenation: concatenate this value onto another value known to be a LuaNumber and return the result using rules of lua string concatenation including metatag processing.
LuaValue	concatTo(LuaString lhs)	Reverse-concatenation: concatenate this value onto another value known to be a LuaString and return the result using rules of lua string concatenation including metatag processing.
void	copyInto(int strOffset, byte[] bytes, int arrayOffset, int len)	Copy the bytes of the string into the given byte array.
static String	decodeAsUtf8(byte[] bytes, int offset, int length)	Convert to Java String interpreting as utf8 characters.
LuaValue	div(double rhs)	Divide: Perform numeric divide operation by another value of double type without metatag processing
LuaValue	div(int rhs)	Divide: Perform numeric divide operation by another value of int type without metatag processing
LuaValue	div(LuaValue rhs)	Divide: Perform numeric divide operation by another value of unknown type, including metatag processing.
LuaValue	divInto(double lhs)	Reverse-divide: Perform numeric divide operation into another value with metatag processing
static int	encodeToUtf8(char[] chars, int nchars, byte[] bytes, int off)	Encode the given Java string as UTF-8 bytes, writing the result to bytes starting at offset.
LuaValue	eq(LuaValue val)	Equals: Perform equality comparison with another value including metatag processing using LuaValue.EQ.
boolean	eq_b(LuaValue val)	Equals: Perform equality comparison with another value including metatag processing using LuaValue.EQ, and return java boolean
static boolean	equals(byte[] a, int i, byte[] b, int j, int n)
static boolean	equals(LuaString a, int i, LuaString b, int j, int n)
boolean	equals(Object o)
LuaValue	getmetatable()	Get the metatable for this LuaValue
LuaValue	gt(LuaValue rhs)	Greater than: Perform numeric or string comparison with another value of unknown type, including metatag processing, and returning LuaValue.
boolean	gt_b(double rhs)	Greater than: Perform numeric or string comparison with another value of unknown type, including metatag processing, and returning java boolean.
boolean	gt_b(int rhs)	Greater than: Perform numeric comparison with another value of int type, including metatag processing, and returning java boolean.
boolean	gt_b(LuaValue rhs)	Greater than: Perform numeric or string comparison with another value of unknown type, including metatag processing, and returning java boolean.
LuaValue	gteq(LuaValue rhs)	Greater than or equals: Perform numeric or string comparison with another value of unknown type, including metatag processing, and returning LuaValue.
boolean	gteq_b(double rhs)	Greater than or equals: Perform numeric comparison with another value of double type, including metatag processing, and returning java boolean.
boolean	gteq_b(int rhs)	Greater than or equals: Perform numeric comparison with another value of int type, including metatag processing, and returning java boolean.
boolean	gteq_b(LuaValue rhs)	Greater than or equals: Perform numeric or string comparison with another value of unknown type, including metatag processing, and returning java boolean.
int	hashCode()
static int	hashCode(byte[] bytes, int offset, int length)	Compute the hash code of a sequence of bytes within a byte array using lua's rules for string hashes.
int	indexOf(byte b, int start)	Find the index of a byte starting at a point in this string
int	indexOf(LuaString s, int start)	Find the index of a string starting at a point in this string
int	indexOfAny(LuaString accept)	Java version of strpbrk - find index of any byte that in an accept string.
boolean	isint()	Check if this is a number and is representable by java int without rounding or truncation
boolean	islong()	Check if this is a number and is representable by java long without rounding or truncation
boolean	isnumber()	Check if this is a number
boolean	isstring()	Check if this is a string
boolean	isValidUtf8()	Check that a byte sequence is valid UTF-8
int	lastIndexOf(LuaString s)	Find the last index of a string in this string
LuaValue	len()	Length operator: return lua length of object (#this) including metatag processing as java int
int	length()	Length operator: return lua length of object (#this) including metatag processing as java int
static int	lengthAsUtf8(char[] chars)	Count the number of bytes required to encode the string as UTF-8.
LuaValue	lt(LuaValue rhs)	Less than: Perform numeric or string comparison with another value of unknown type, including metatag processing, and returning LuaValue.
boolean	lt_b(double rhs)	Less than: Perform numeric or string comparison with another value of unknown type, including metatag processing, and returning java boolean.
boolean	lt_b(int rhs)	Less than: Perform numeric comparison with another value of int type, including metatag processing, and returning java boolean.
boolean	lt_b(LuaValue rhs)	Less than: Perform numeric or string comparison with another value of unknown type, including metatag processing, and returning java boolean.
LuaValue	lteq(LuaValue rhs)	Less than or equals: Perform numeric or string comparison with another value of unknown type, including metatag processing, and returning LuaValue.
boolean	lteq_b(double rhs)	Less than or equals: Perform numeric comparison with another value of double type, including metatag processing, and returning java boolean.
boolean	lteq_b(int rhs)	Less than or equals: Perform numeric comparison with another value of int type, including metatag processing, and returning java boolean.
boolean	lteq_b(LuaValue rhs)	Less than or equals: Perform numeric or string comparison with another value of unknown type, including metatag processing, and returning java boolean.
int	luaByte(int index)
LuaValue	mod(double rhs)	Modulo: Perform numeric modulo operation with another value of double type without metatag processing
LuaValue	mod(int rhs)	Modulo: Perform numeric modulo operation with another value of int type without metatag processing
LuaValue	mod(LuaValue rhs)	Modulo: Perform numeric modulo operation with another value of unknown type, including metatag processing.
LuaValue	modFrom(double lhs)	Reverse-modulo: Perform numeric modulo operation from another value with metatag processing
LuaValue	mul(double rhs)	Multiply: Perform numeric multiply operation with another value of double type with metatag processing
LuaValue	mul(int rhs)	Multiply: Perform numeric multiply operation with another value of int type with metatag processing
LuaValue	mul(LuaValue rhs)	Multiply: Perform numeric multiply operation with another value of unknown type, including metatag processing.
LuaValue	neg()	Unary minus: return negative value (-this) as defined by lua unary minus operator
double	optdouble(double defval)	Check that optional argument is a number or string convertible to number and return as double
int	optint(int defval)	Check that optional argument is a number or string convertible to number and return as int
String	optjstring(String defval)	Check that optional argument is a string or number and return as Java String
long	optlong(long defval)	Check that optional argument is a number or string convertible to number and return as long
LuaNumber	optnumber(LuaNumber defval)	Check that optional argument is a number or string convertible to number and return as LuaNumber
LuaString	optstring(LuaString defval)	Check that optional argument is a string or number and return as LuaString
LuaValue	pow(double rhs)	Raise to power: Raise this value to a power of double type with metatag processing
LuaValue	pow(int rhs)	Raise to power: Raise this value to a power of int type with metatag processing
LuaValue	pow(LuaValue rhs)	Raise to power: Raise this value to a power including metatag processing.
LuaValue	powWith(double lhs)	Reverse-raise to power: Raise another value of double type to this power with metatag processing
LuaValue	powWith(int lhs)	Reverse-raise to power: Raise another value of double type to this power with metatag processing
void	printToStream(PrintStream ps)	Print the bytes of the LuaString to a PrintStream as if it were an ASCII string, quoting and escaping control characters.
boolean	raweq(LuaString s)	Equals: Perform direct equality comparison with a LuaString value without metatag processing.
boolean	raweq(LuaValue val)	Equals: Perform direct equality comparison with another value without metatag processing.
int	rawlen()	Get raw length of table or string without metatag processing.
void	read(com.esotericsoftware.kryo.Kryo kryo, com.esotericsoftware.kryo.io.Input input)
double	scannumber()	Convert to a number in base 10, or base 16 if the string starts with '0x', or return Double.NaN if it cannot be converted to a number.
double	scannumber(int base)	Convert to a number in a base, or return Double.NaN if not a number.
int	strcmp(LuaString rhs)	Perform string comparison with another value known to be a LuaString using string comparison based on byte values.
int	strcmp(LuaValue lhs)	Perform string comparison with another value of any type using string comparison based on byte values.
LuaString	strvalue()	Convert this value to a string if it is a LuaString or LuaNumber, or throw a LuaError if it is not
LuaValue	sub(double rhs)	Subtract: Perform numeric subtract operation with another value of double type with metatag processing
LuaValue	sub(int rhs)	Subtract: Perform numeric subtract operation with another value of int type with metatag processing
LuaValue	sub(LuaValue rhs)	Subtract: Perform numeric subtract operation with another value of unknown type, including metatag processing.
LuaValue	subFrom(double lhs)	Reverse-subtract: Perform numeric subtract operation from an int value with metatag processing
LuaString	substring(int beginIndex, int endIndex)	Take a substring using Java zero-based indexes for begin and end or range.
byte	tobyte()	Convert to byte if numeric, or 0 if not.
char	tochar()	Convert to char if numeric, or 0 if not.
double	todouble()	Convert to double if numeric, or 0 if not.
float	tofloat()	Convert to float if numeric, or 0 if not.
InputStream	toInputStream()	Convert value to an input stream.
int	toint()	Convert to int if numeric, or 0 if not.
String	tojstring()	Convert to human readable String for any type.
long	tolong()	Convert to long if numeric, or 0 if not.
LuaValue	tonumber()	convert to a number using baee 10 or base 16 if it starts with '0x', or NIL if it can't be converted
LuaValue	tonumber(int base)	convert to a number using a supplied base, or NIL if it can't be converted
short	toshort()	Convert to short if numeric, or 0 if not.
LuaValue	tostring()	Conditionally convert to lua string without throwing errors.
int	type()	Get the enumeration value for the type of this value.
String	typename()	Get the String name of the type of this value.
static LuaString	valueOf(byte[] bytes)	Construct a LuaString for all the bytes in a byte array.
static LuaString	valueOf(byte[] bytes, int off, int len)	Construct a LuaString for a portion of a byte array.
static LuaString	valueOf(char[] bytes)	Construct a LuaString using the supplied characters as byte values.
static LuaString	valueOf(char[] bytes, int off, int len)	Construct a LuaString using the supplied characters as byte values.
static LuaString	valueOf(String string)	Get a LuaString instance whose bytes match the supplied Java String using the UTF8 encoding.
static LuaString	valueUsing(byte[] bytes)	Construct a LuaString for all the bytes in a byte array, possibly using the supplied array as the backing store.
static LuaString	valueUsing(byte[] bytes, int off, int len)	Construct a LuaString around, possibly using the the supplied byte array as the backing store.
void	write(com.esotericsoftware.kryo.Kryo kryo, com.esotericsoftware.kryo.io.Output output)
void	write(DataOutputStream writer, int i, int len)

Methods inherited from class com.prineside.luaj.LuaValue

and, arg, arg1, argerror, argerror, aritherror, aritherror, arithmt, arithmtwith, assert_, buffer, call, call, call, call, call, callmt, cBool, cDouble, cFloat, checkboolean, checkclosure, checkfunction, checkglobals, checkmetatag, checknotnil, checktable, checkthread, checkuserdata, checkuserdata, cInt, cNcDouble, cNcFloat, cNcInt, cObject, compareerror, compareerror, comparemt, concatmt, concatTo, cRegObject, cVarargs, cVarargs, cVarargs, cVarargs, cVarargs, cVarargs, cVarargs, cVarargs, eqmtcall, error, get, get, get, gettable, gt, gt, gteq, gteq, illegal, inext, initupvalue1, invoke, invoke, invoke, invoke, invokemethod, invokemethod, invokemethod, invokemethod, isboolean, isclosure, isfunction, isinttype, isnil, isRegObject, istable, isthread, isuserdata, isuserdata, isvalidkey, lenerror, listOf, listOf, load, lt, lt, lteq, lteq, markAsConst, metatableOf, metatag, method, method, method, method, method, method, narg, neq, neq_b, next, not, onInvoke, optboolean, optclosure, optfunction, opttable, optthread, optuserdata, optuserdata, optvalue, or, presize, raweq, raweq, raweq, rawget, rawget, rawget, rawset, rawset, rawset, rawset, rawset, rawset, rawset, rawsetlist, set, set, set, set, set, set, set, setmetatable, settable, strongvalue, subargs, subFrom, tableOf, tableOf, tableOf, tableOf, tableOf, tableOf, tailcallOf, testfor_b, toboolean, toString, touserdata, touserdata, typerror, unimplemented, userdataOf, userdataOf, valueOf, valueOf, valueOf

Methods inherited from class com.prineside.luaj.Varargs

argcheck, checkboolean, checkclosure, checkdouble, checkfunction, checkint, checkjstring, checklong, checknotnil, checknumber, checkstring, checktable, checkthread, checkuserdata, checkuserdata, checkvalue, dealias, eval, isfunction, isnil, isnoneornil, isnumber, isstring, istable, isTailcall, isthread, isuserdata, isvalue, optboolean, optclosure, optdouble, optfunction, optint, optjstring, optlong, optnumber, optstring, opttable, optthread, optuserdata, optuserdata, optvalue, toboolean, tobyte, tochar, todouble, tofloat, toint, tojstring, tolong, toshort, touserdata, touserdata, type

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Details

s_metatable

public static LuaValue s_metatable

The singleton instance for string metatables that forwards to the string functions. Typically, this is set to the string metatable as a side effect of loading the string library, and is read-write to provide flexible behavior by default. When used in a server environment where there may be roge scripts, this should be replaced with a read-only table since it is shared across all lua code in this Java VM.

m_bytes

public byte[] m_bytes

The bytes for the string. These must not be mutated directly because the backing may be shared by multiple LuaStrings, and the hash code is computed only at construction time. It is exposed only for performance and legacy reasons.

m_offset

public int m_offset

The offset into the byte array, 0 means start at the first byte

m_length

public int m_length

The number of bytes that comprise this string

Method Details

write

public void write(com.esotericsoftware.kryo.Kryo kryo,
 com.esotericsoftware.kryo.io.Output output)

Specified by:

write in interface com.esotericsoftware.kryo.KryoSerializable

read

public void read(com.esotericsoftware.kryo.Kryo kryo,
 com.esotericsoftware.kryo.io.Input input)

Specified by:

read in interface com.esotericsoftware.kryo.KryoSerializable

valueOf

public static LuaString valueOf(String string)

Get a LuaString instance whose bytes match the supplied Java String using the UTF8 encoding.

Parameters:

string - Java String containing characters to encode as UTF8

Returns:

LuaString with UTF8 bytes corresponding to the supplied String

valueOf

public static LuaString valueOf(byte[] bytes,
 int off,
 int len)

Construct a LuaString for a portion of a byte array.

The array is first be used as the backing for this object, so clients must not change contents. If the supplied value for 'len' is more than half the length of the container, the supplied byte array will be used as the backing, otherwise the bytes will be copied to a new byte array, and cache lookup may be performed.

Parameters:

bytes - byte buffer

off - offset into the byte buffer

len - length of the byte buffer

Returns:

LuaString wrapping the byte buffer

valueUsing

public static LuaString valueUsing(byte[] bytes,
 int off,
 int len)

Construct a LuaString around, possibly using the the supplied byte array as the backing store.

The caller must ensure that the array is not mutated after the call. However, if the string is short enough the short-string cache is checked for a match which may be used instead of the supplied byte array.

Parameters:

bytes - byte buffer

Returns:

LuaString wrapping the byte buffer, or an equivalent string.

valueOf

public static LuaString valueOf(char[] bytes)

Construct a LuaString using the supplied characters as byte values.

Only the low-order 8-bits of each character are used, the remainder is ignored.

This is most useful for constructing byte sequences that do not conform to UTF8.

Parameters:

bytes - array of char, whose values are truncated at 8-bits each and put into a byte array.

Returns:

LuaString wrapping a copy of the byte buffer

valueOf

public static LuaString valueOf(char[] bytes,
 int off,
 int len)

Construct a LuaString using the supplied characters as byte values.

Only the low-order 8-bits of each character are used, the remainder is ignored.

This is most useful for constructing byte sequences that do not conform to UTF8.

Parameters:

bytes - array of char, whose values are truncated at 8-bits each and put into a byte array.

Returns:

LuaString wrapping a copy of the byte buffer

valueOf

public static LuaString valueOf(byte[] bytes)

Construct a LuaString for all the bytes in a byte array.

The LuaString returned will either be a new LuaString containing a copy of the bytes array, or be an existing LuaString used already having the same value.

Parameters:

bytes - byte buffer

Returns:

LuaString wrapping the byte buffer

valueUsing

public static LuaString valueUsing(byte[] bytes)

Construct a LuaString for all the bytes in a byte array, possibly using the supplied array as the backing store.

The LuaString returned will either be a new LuaString containing the byte array, or be an existing LuaString used already having the same value.

The caller must not mutate the contents of the byte array after this call, as it may be used elsewhere due to recent short string caching.

Parameters:

bytes - byte buffer

Returns:

LuaString wrapping the byte buffer

isstring

public boolean isstring()

Description copied from class: LuaValue

Check if this is a string

Overrides:

isstring in class LuaValue

Returns:

true if this is a string, meaning derives from LuaString or LuaNumber, otherwise false

See Also:

• LuaValue.tostring()
• LuaValue.checkstring()
• LuaValue.optstring(LuaString)
• LuaValue.TSTRING

getmetatable

public LuaValue getmetatable()

Description copied from class: LuaValue

Get the metatable for this LuaValue

For LuaTable and LuaUserdata instances, the metatable returned is this instance metatable. For all other types, the class metatable value will be returned.

Overrides:

getmetatable in class LuaValue

Returns:

metatable, or null if it there is none

type

public int type()

Description copied from class: LuaValue

Get the enumeration value for the type of this value.

Specified by:

type in class LuaValue

Returns:

value for this type, one of LuaValue.TNIL, LuaValue.TBOOLEAN, LuaValue.TNUMBER, LuaValue.TSTRING, LuaValue.TTABLE, LuaValue.TFUNCTION, LuaValue.TUSERDATA, LuaValue.TTHREAD

See Also:

• LuaValue.typename()

typename

public String typename()

Description copied from class: LuaValue

Get the String name of the type of this value.

Specified by:

typename in class LuaValue

Returns:

name from type name list LuaValue.TYPE_NAMES corresponding to the type of this value: "nil", "boolean", "number", "string", "table", "function", "userdata", "thread"

See Also:

• LuaValue.type()

tojstring

public String tojstring()

Description copied from class: LuaValue

Convert to human readable String for any type.

Overrides:

tojstring in class LuaValue

Returns:

String for use by human readers based on type.

See Also:

• LuaValue.tostring()
• LuaValue.optjstring(String)
• LuaValue.checkjstring()
• LuaValue.isstring()
• LuaValue.TSTRING

neg

public LuaValue neg()

Description copied from class: LuaValue

Unary minus: return negative value (-this) as defined by lua unary minus operator

Overrides:

neg in class LuaValue

Returns:

boolean inverse as LuaBoolean if boolean or nil, numeric inverse as LuaNumber if numeric, or metatag processing result if LuaValue.UNM metatag is defined

add

public LuaValue add(LuaValue rhs)

Description copied from class: LuaValue

Add: Perform numeric add operation with another value including metatag processing.

Each operand must derive from LuaNumber or derive from LuaString and be convertible to a number

Overrides:

add in class LuaValue

Parameters:

rhs - The right-hand-side value to perform the add with

Returns:

value of (this + rhs) if both are numeric, or LuaValue if metatag processing occurs

See Also:

• LuaValue.arithmt(LuaValue, LuaValue)

add

public LuaValue add(double rhs)

Description copied from class: LuaValue

Add: Perform numeric add operation with another value of double type with metatag processing

this must derive from LuaNumber or derive from LuaString and be convertible to a number

Overrides:

add in class LuaValue

Parameters:

rhs - The right-hand-side value to perform the add with

Returns:

value of (this + rhs) if this is numeric

See Also:

• LuaValue.add(LuaValue)

add

public LuaValue add(int rhs)

Description copied from class: LuaValue

Add: Perform numeric add operation with another value of int type with metatag processing

this must derive from LuaNumber or derive from LuaString and be convertible to a number

Overrides:

add in class LuaValue

Parameters:

rhs - The right-hand-side value to perform the add with

Returns:

value of (this + rhs) if this is numeric

See Also:

• LuaValue.add(LuaValue)

sub

public LuaValue sub(LuaValue rhs)

Description copied from class: LuaValue

Subtract: Perform numeric subtract operation with another value of unknown type, including metatag processing.

Each operand must derive from LuaNumber or derive from LuaString and be convertible to a number

Overrides:

sub in class LuaValue

Parameters:

rhs - The right-hand-side value to perform the subtract with

Returns:

value of (this - rhs) if both are numeric, or LuaValue if metatag processing occurs

See Also:

• LuaValue.arithmt(LuaValue, LuaValue)

sub

public LuaValue sub(double rhs)

Description copied from class: LuaValue

Subtract: Perform numeric subtract operation with another value of double type with metatag processing

this must derive from LuaNumber or derive from LuaString and be convertible to a number

Overrides:

sub in class LuaValue

Parameters:

rhs - The right-hand-side value to perform the subtract with

Returns:

value of (this - rhs) if this is numeric

See Also:

• LuaValue.sub(LuaValue)

sub

public LuaValue sub(int rhs)

Description copied from class: LuaValue

Subtract: Perform numeric subtract operation with another value of int type with metatag processing

this must derive from LuaNumber or derive from LuaString and be convertible to a number

Overrides:

sub in class LuaValue

Parameters:

rhs - The right-hand-side value to perform the subtract with

Returns:

value of (this - rhs) if this is numeric

See Also:

• LuaValue.sub(LuaValue)

subFrom

public LuaValue subFrom(double lhs)

Description copied from class: LuaValue

Reverse-subtract: Perform numeric subtract operation from an int value with metatag processing

this must derive from LuaNumber or derive from LuaString and be convertible to a number

Overrides:

subFrom in class LuaValue

Parameters:

lhs - The left-hand-side value from which to perform the subtraction

Returns:

value of (lhs - this) if this is numeric

See Also:

• LuaValue.sub(LuaValue)
• LuaValue.sub(double)
• LuaValue.sub(int)

mul

public LuaValue mul(LuaValue rhs)

Description copied from class: LuaValue

Multiply: Perform numeric multiply operation with another value of unknown type, including metatag processing.

Each operand must derive from LuaNumber or derive from LuaString and be convertible to a number

Overrides:

mul in class LuaValue

Parameters:

rhs - The right-hand-side value to perform the multiply with

Returns:

value of (this * rhs) if both are numeric, or LuaValue if metatag processing occurs

See Also:

• LuaValue.arithmt(LuaValue, LuaValue)

mul

public LuaValue mul(double rhs)

Description copied from class: LuaValue

Multiply: Perform numeric multiply operation with another value of double type with metatag processing

this must derive from LuaNumber or derive from LuaString and be convertible to a number

Overrides:

mul in class LuaValue

Parameters:

rhs - The right-hand-side value to perform the multiply with

Returns:

value of (this * rhs) if this is numeric

mul

public LuaValue mul(int rhs)

Description copied from class: LuaValue

Multiply: Perform numeric multiply operation with another value of int type with metatag processing

this must derive from LuaNumber or derive from LuaString and be convertible to a number

Overrides:

mul in class LuaValue

Parameters:

rhs - The right-hand-side value to perform the multiply with

Returns:

value of (this * rhs) if this is numeric

pow

public LuaValue pow(LuaValue rhs)

Description copied from class: LuaValue

Raise to power: Raise this value to a power including metatag processing.

Each operand must derive from LuaNumber or derive from LuaString and be convertible to a number

Overrides:

pow in class LuaValue

Parameters:

rhs - The power to raise this value to

Returns:

value of (this ^ rhs) if both are numeric, or LuaValue if metatag processing occurs

See Also:

• LuaValue.arithmt(LuaValue, LuaValue)

pow

public LuaValue pow(double rhs)

Description copied from class: LuaValue

Raise to power: Raise this value to a power of double type with metatag processing

this must derive from LuaNumber or derive from LuaString and be convertible to a number

Overrides:

pow in class LuaValue

Parameters:

rhs - The power to raise this value to

Returns:

value of (this ^ rhs) if this is numeric

See Also:

• LuaValue.pow(LuaValue)

pow

public LuaValue pow(int rhs)

Description copied from class: LuaValue

Raise to power: Raise this value to a power of int type with metatag processing

this must derive from LuaNumber or derive from LuaString and be convertible to a number

Overrides:

pow in class LuaValue

Parameters:

rhs - The power to raise this value to

Returns:

value of (this ^ rhs) if this is numeric

See Also:

• LuaValue.pow(LuaValue)

powWith

public LuaValue powWith(double lhs)

Description copied from class: LuaValue

Reverse-raise to power: Raise another value of double type to this power with metatag processing

this must derive from LuaNumber or derive from LuaString and be convertible to a number

Overrides:

powWith in class LuaValue

Parameters:

lhs - The left-hand-side value which will be raised to this power

Returns:

value of (lhs ^ this) if this is numeric

See Also:

• LuaValue.pow(LuaValue)
• LuaValue.pow(double)
• LuaValue.pow(int)

powWith

public LuaValue powWith(int lhs)

Description copied from class: LuaValue

Reverse-raise to power: Raise another value of double type to this power with metatag processing

this must derive from LuaNumber or derive from LuaString and be convertible to a number

Overrides:

powWith in class LuaValue

Parameters:

lhs - The left-hand-side value which will be raised to this power

Returns:

value of (lhs ^ this) if this is numeric

See Also:

• LuaValue.pow(LuaValue)
• LuaValue.pow(double)
• LuaValue.pow(int)

div

public LuaValue div(LuaValue rhs)

Description copied from class: LuaValue

Divide: Perform numeric divide operation by another value of unknown type, including metatag processing.

Each operand must derive from LuaNumber or derive from LuaString and be convertible to a number

Overrides:

div in class LuaValue

Parameters:

rhs - The right-hand-side value to perform the divulo with

Returns:

value of (this / rhs) if both are numeric, or LuaValue if metatag processing occurs

See Also:

• LuaValue.arithmt(LuaValue, LuaValue)

div

public LuaValue div(double rhs)

Description copied from class: LuaValue

Divide: Perform numeric divide operation by another value of double type without metatag processing

this must derive from LuaNumber or derive from LuaString and be convertible to a number

For metatag processing LuaValue.div(LuaValue) must be used

Overrides:

div in class LuaValue

Parameters:

rhs - The right-hand-side value to perform the divulo with

Returns:

value of (this / rhs) if this is numeric

See Also:

• LuaValue.div(LuaValue)

div

public LuaValue div(int rhs)

Description copied from class: LuaValue

Divide: Perform numeric divide operation by another value of int type without metatag processing

this must derive from LuaNumber or derive from LuaString and be convertible to a number

For metatag processing LuaValue.div(LuaValue) must be used

Overrides:

div in class LuaValue

Parameters:

rhs - The right-hand-side value to perform the divulo with

Returns:

value of (this / rhs) if this is numeric

See Also:

• LuaValue.div(LuaValue)

divInto

public LuaValue divInto(double lhs)

Description copied from class: LuaValue

Reverse-divide: Perform numeric divide operation into another value with metatag processing

this must derive from LuaNumber or derive from LuaString and be convertible to a number

Overrides:

divInto in class LuaValue

Parameters:

lhs - The left-hand-side value which will be divided by this

Returns:

value of (lhs / this) if this is numeric

See Also:

• LuaValue.div(LuaValue)
• LuaValue.div(double)
• LuaValue.div(int)

mod

public LuaValue mod(LuaValue rhs)

Description copied from class: LuaValue

Modulo: Perform numeric modulo operation with another value of unknown type, including metatag processing.

Each operand must derive from LuaNumber or derive from LuaString and be convertible to a number

Overrides:

mod in class LuaValue

Parameters:

rhs - The right-hand-side value to perform the modulo with

Returns:

value of (this % rhs) if both are numeric, or LuaValue if metatag processing occurs

See Also:

• LuaValue.arithmt(LuaValue, LuaValue)

mod

public LuaValue mod(double rhs)

Description copied from class: LuaValue

Modulo: Perform numeric modulo operation with another value of double type without metatag processing

this must derive from LuaNumber or derive from LuaString and be convertible to a number

For metatag processing LuaValue.mod(LuaValue) must be used

Overrides:

mod in class LuaValue

Parameters:

rhs - The right-hand-side value to perform the modulo with

Returns:

value of (this % rhs) if this is numeric

See Also:

• LuaValue.mod(LuaValue)

mod

public LuaValue mod(int rhs)

Description copied from class: LuaValue

Modulo: Perform numeric modulo operation with another value of int type without metatag processing

this must derive from LuaNumber or derive from LuaString and be convertible to a number

For metatag processing LuaValue.mod(LuaValue) must be used

Overrides:

mod in class LuaValue

Parameters:

rhs - The right-hand-side value to perform the modulo with

Returns:

value of (this % rhs) if this is numeric

See Also:

• LuaValue.mod(LuaValue)

modFrom

public LuaValue modFrom(double lhs)

Description copied from class: LuaValue

Reverse-modulo: Perform numeric modulo operation from another value with metatag processing

this must derive from LuaNumber or derive from LuaString and be convertible to a number

Overrides:

modFrom in class LuaValue

Parameters:

lhs - The left-hand-side value which will be modulo'ed by this

Returns:

value of (lhs % this) if this is numeric

See Also:

• LuaValue.mod(LuaValue)
• LuaValue.mod(double)
• LuaValue.mod(int)

lt

public LuaValue lt(LuaValue rhs)

Description copied from class: LuaValue

Less than: Perform numeric or string comparison with another value of unknown type, including metatag processing, and returning LuaValue.

To be comparable, both operands must derive from LuaString or both must derive from LuaNumber.

Overrides:

lt in class LuaValue

Parameters:

rhs - The right-hand-side value to perform the comparison with

Returns:

LuaValue.TRUE if (this < rhs), LuaValue.FALSE if not, or LuaValue if metatag processing occurs

See Also:

• LuaValue.gteq_b(LuaValue)
• LuaValue.comparemt(LuaValue, LuaValue)

lt_b

public boolean lt_b(LuaValue rhs)

Description copied from class: LuaValue

Less than: Perform numeric or string comparison with another value of unknown type, including metatag processing, and returning java boolean.

To be comparable, both operands must derive from LuaString or both must derive from LuaNumber.

Overrides:

lt_b in class LuaValue

Parameters:

rhs - The right-hand-side value to perform the comparison with

Returns:

true if (this < rhs), false if not, and boolean interpreation of result if metatag processing occurs.

See Also:

• LuaValue.gteq(LuaValue)
• LuaValue.comparemt(LuaValue, LuaValue)

lt_b

public boolean lt_b(int rhs)

Description copied from class: LuaValue

Less than: Perform numeric comparison with another value of int type, including metatag processing, and returning java boolean.

To be comparable, this must derive from LuaNumber.

Overrides:

lt_b in class LuaValue

Parameters:

rhs - The right-hand-side value to perform the comparison with

Returns:

true if (this < rhs), false if not, and boolean interpreation of result if metatag processing occurs.

See Also:

• LuaValue.gteq(int)
• LuaValue.comparemt(LuaValue, LuaValue)

lt_b

public boolean lt_b(double rhs)

Description copied from class: LuaValue

Less than: Perform numeric or string comparison with another value of unknown type, including metatag processing, and returning java boolean.

To be comparable, both operands must derive from LuaString or both must derive from LuaNumber.

Overrides:

lt_b in class LuaValue

Parameters:

rhs - The right-hand-side value to perform the comparison with

Returns:

true if (this < rhs), false if not, and boolean interpreation of result if metatag processing occurs.

See Also:

• LuaValue.gteq(LuaValue)
• LuaValue.comparemt(LuaValue, LuaValue)

lteq

public LuaValue lteq(LuaValue rhs)

Description copied from class: LuaValue

Less than or equals: Perform numeric or string comparison with another value of unknown type, including metatag processing, and returning LuaValue.

To be comparable, both operands must derive from LuaString or both must derive from LuaNumber.

Overrides:

lteq in class LuaValue

Parameters:

rhs - The right-hand-side value to perform the comparison with

Returns:

LuaValue.TRUE if (this <= rhs), LuaValue.FALSE if not, or LuaValue if metatag processing occurs

See Also:

• LuaValue.gteq_b(LuaValue)
• LuaValue.comparemt(LuaValue, LuaValue)

lteq_b

public boolean lteq_b(LuaValue rhs)

Description copied from class: LuaValue

Less than or equals: Perform numeric or string comparison with another value of unknown type, including metatag processing, and returning java boolean.

To be comparable, both operands must derive from LuaString or both must derive from LuaNumber.

Overrides:

lteq_b in class LuaValue

Parameters:

rhs - The right-hand-side value to perform the comparison with

Returns:

true if (this <= rhs), false if not, and boolean interpreation of result if metatag processing occurs.

See Also:

• LuaValue.gteq(LuaValue)
• LuaValue.comparemt(LuaValue, LuaValue)

lteq_b

public boolean lteq_b(int rhs)

Description copied from class: LuaValue

Less than or equals: Perform numeric comparison with another value of int type, including metatag processing, and returning java boolean.

To be comparable, this must derive from LuaNumber.

Overrides:

lteq_b in class LuaValue

Parameters:

rhs - The right-hand-side value to perform the comparison with

Returns:

true if (this <= rhs), false if not, and boolean interpreation of result if metatag processing occurs.

See Also:

• LuaValue.gteq(int)
• LuaValue.comparemt(LuaValue, LuaValue)

lteq_b

public boolean lteq_b(double rhs)

Description copied from class: LuaValue

Less than or equals: Perform numeric comparison with another value of double type, including metatag processing, and returning java boolean.

To be comparable, this must derive from LuaNumber.

Overrides:

lteq_b in class LuaValue

Parameters:

rhs - The right-hand-side value to perform the comparison with

Returns:

true if (this <= rhs), false if not, and boolean interpreation of result if metatag processing occurs.

See Also:

• LuaValue.gteq(double)
• LuaValue.comparemt(LuaValue, LuaValue)

gt

public LuaValue gt(LuaValue rhs)

Description copied from class: LuaValue

Greater than: Perform numeric or string comparison with another value of unknown type, including metatag processing, and returning LuaValue.

To be comparable, both operands must derive from LuaString or both must derive from LuaNumber.

Overrides:

gt in class LuaValue

Parameters:

rhs - The right-hand-side value to perform the comparison with

Returns:

LuaValue.TRUE if (this > rhs), LuaValue.FALSE if not, or LuaValue if metatag processing occurs

See Also:

• LuaValue.gteq_b(LuaValue)
• LuaValue.comparemt(LuaValue, LuaValue)

gt_b

public boolean gt_b(LuaValue rhs)

Description copied from class: LuaValue

Greater than: Perform numeric or string comparison with another value of unknown type, including metatag processing, and returning java boolean.

To be comparable, both operands must derive from LuaString or both must derive from LuaNumber.

Overrides:

gt_b in class LuaValue

Parameters:

rhs - The right-hand-side value to perform the comparison with

Returns:

true if (this > rhs), false if not, and boolean interpreation of result if metatag processing occurs.

See Also:

• LuaValue.gteq(LuaValue)
• LuaValue.comparemt(LuaValue, LuaValue)

gt_b

public boolean gt_b(int rhs)

Description copied from class: LuaValue

Greater than: Perform numeric comparison with another value of int type, including metatag processing, and returning java boolean.

To be comparable, this must derive from LuaNumber.

Overrides:

gt_b in class LuaValue

Parameters:

rhs - The right-hand-side value to perform the comparison with

Returns:

true if (this > rhs), false if not, and boolean interpreation of result if metatag processing occurs.

See Also:

• LuaValue.gteq(int)
• LuaValue.comparemt(LuaValue, LuaValue)

gt_b

public boolean gt_b(double rhs)

Description copied from class: LuaValue

Greater than: Perform numeric or string comparison with another value of unknown type, including metatag processing, and returning java boolean.

To be comparable, both operands must derive from LuaString or both must derive from LuaNumber.

Overrides:

gt_b in class LuaValue

Parameters:

rhs - The right-hand-side value to perform the comparison with

Returns:

true if (this > rhs), false if not, and boolean interpreation of result if metatag processing occurs.

See Also:

• LuaValue.gteq(LuaValue)
• LuaValue.comparemt(LuaValue, LuaValue)

gteq

public LuaValue gteq(LuaValue rhs)

Description copied from class: LuaValue

Greater than or equals: Perform numeric or string comparison with another value of unknown type, including metatag processing, and returning LuaValue.

To be comparable, both operands must derive from LuaString or both must derive from LuaNumber.

Overrides:

gteq in class LuaValue

Parameters:

rhs - The right-hand-side value to perform the comparison with

Returns:

LuaValue.TRUE if (this >= rhs), LuaValue.FALSE if not, or LuaValue if metatag processing occurs

See Also:

• LuaValue.gteq_b(LuaValue)
• LuaValue.comparemt(LuaValue, LuaValue)

gteq_b

public boolean gteq_b(LuaValue rhs)

Description copied from class: LuaValue

Greater than or equals: Perform numeric or string comparison with another value of unknown type, including metatag processing, and returning java boolean.

To be comparable, both operands must derive from LuaString or both must derive from LuaNumber.

Overrides:

gteq_b in class LuaValue

Parameters:

rhs - The right-hand-side value to perform the comparison with

Returns:

true if (this >= rhs), false if not, and boolean interpreation of result if metatag processing occurs.

See Also:

• LuaValue.gteq(LuaValue)
• LuaValue.comparemt(LuaValue, LuaValue)

gteq_b

public boolean gteq_b(int rhs)

Description copied from class: LuaValue

Greater than or equals: Perform numeric comparison with another value of int type, including metatag processing, and returning java boolean.

To be comparable, this must derive from LuaNumber.

Overrides:

gteq_b in class LuaValue

Parameters:

rhs - The right-hand-side value to perform the comparison with

Returns:

true if (this >= rhs), false if not, and boolean interpreation of result if metatag processing occurs.

See Also:

• LuaValue.gteq(int)
• LuaValue.comparemt(LuaValue, LuaValue)

gteq_b

public boolean gteq_b(double rhs)

Description copied from class: LuaValue

Greater than or equals: Perform numeric comparison with another value of double type, including metatag processing, and returning java boolean.

To be comparable, this must derive from LuaNumber.

Overrides:

gteq_b in class LuaValue

Parameters:

rhs - The right-hand-side value to perform the comparison with

Returns:

true if (this >= rhs), false if not, and boolean interpreation of result if metatag processing occurs.

See Also:

• LuaValue.gteq(double)
• LuaValue.comparemt(LuaValue, LuaValue)

concat

public LuaValue concat(LuaValue rhs)

Description copied from class: LuaValue

Concatenate another value onto this value and return the result using rules of lua string concatenation including metatag processing.

Only strings and numbers as represented can be concatenated, meaning each operand must derive from LuaString or LuaNumber.

Overrides:

concat in class LuaValue

Parameters:

rhs - The right-hand-side value to perform the operation with

Returns:

LuaValue resulting from concatenation of (this .. rhs)

concat

public Buffer concat(Buffer rhs)

Description copied from class: LuaValue

Concatenate a Buffer onto this value and return the result using rules of lua string concatenation including metatag processing.

Only strings and numbers as represented can be concatenated, meaning each operand must derive from LuaString or LuaNumber.

Overrides:

concat in class LuaValue

Parameters:

rhs - The right-hand-side Buffer to perform the operation with

Returns:

LuaString resulting from concatenation of (this .. rhs)

concatTo

public LuaValue concatTo(LuaNumber lhs)

Description copied from class: LuaValue

Reverse-concatenation: concatenate this value onto another value known to be a LuaNumber and return the result using rules of lua string concatenation including metatag processing.

Only strings and numbers as represented can be concatenated, meaning each operand must derive from LuaString or LuaNumber.

Overrides:

concatTo in class LuaValue

Parameters:

lhs - The left-hand-side value onto which this will be concatenated

Returns:

LuaValue resulting from concatenation of (lhs .. this)

See Also:

• LuaValue.concat(LuaValue)

concatTo

public LuaValue concatTo(LuaString lhs)

Description copied from class: LuaValue

Reverse-concatenation: concatenate this value onto another value known to be a LuaString and return the result using rules of lua string concatenation including metatag processing.

Only strings and numbers as represented can be concatenated, meaning each operand must derive from LuaString or LuaNumber.

Overrides:

concatTo in class LuaValue

Parameters:

lhs - The left-hand-side value onto which this will be concatenated

Returns:

LuaValue resulting from concatenation of (lhs .. this)

See Also:

• LuaValue.concat(LuaValue)

strcmp

public int strcmp(LuaValue lhs)

Description copied from class: LuaValue

Perform string comparison with another value of any type using string comparison based on byte values.

Only strings can be compared, meaning each operand must derive from LuaString.

Overrides:

strcmp in class LuaValue

Parameters:

lhs - The right-hand-side value to perform the comparison with

Returns:

int < 0 for (this < rhs), int > 0 for (this > rhs), or 0 when same string.

strcmp

public int strcmp(LuaString rhs)

Description copied from class: LuaValue

Perform string comparison with another value known to be a LuaString using string comparison based on byte values.

Only strings can be compared, meaning each operand must derive from LuaString.

Overrides:

strcmp in class LuaValue

Parameters:

rhs - The right-hand-side value to perform the comparison with

Returns:

int < 0 for (this < rhs), int > 0 for (this > rhs), or 0 when same string.

checkint

public int checkint()

Description copied from class: LuaValue

Check that the value is numeric, and convert and cast value to int, or throw LuaError if not numeric

Values that are LuaNumber will be cast to int and may lose precision. Values that are LuaString that can be converted to a number will be converted, then cast to int, so may also lose precision.

Overrides:

checkint in class LuaValue

Returns:

value cast to a int if numeric

See Also:

• LuaValue.checklong()
• LuaValue.checkdouble()
• LuaValue.optint(int)
• LuaValue.TNUMBER

checklong

public long checklong()

Description copied from class: LuaValue

Check that the value is numeric, and convert and cast value to long, or throw LuaError if not numeric

Values that are LuaNumber will be cast to long and may lose precision. Values that are LuaString that can be converted to a number will be converted, then cast to long, so may also lose precision.

Overrides:

checklong in class LuaValue

Returns:

value cast to a long if numeric

See Also:

• LuaValue.checkint()
• LuaValue.checkdouble()
• LuaValue.optlong(long)
• LuaValue.TNUMBER

checkdouble

public double checkdouble()

Description copied from class: LuaValue

Check that the value is numeric and return the value as a double, or throw LuaError if not numeric

Values that are LuaNumber and values that are LuaString that can be converted to a number will be converted to double.

Overrides:

checkdouble in class LuaValue

Returns:

value cast to a double if numeric

See Also:

• LuaValue.checkint()
• LuaValue.checklong()
• LuaValue.optdouble(double)
• LuaValue.TNUMBER

checknumber

public LuaNumber checknumber()

Description copied from class: LuaValue

Check that the value is numeric, and return as a LuaNumber if so, or throw LuaError

Values that are LuaString that can be converted to a number will be converted and returned.

Overrides:

checknumber in class LuaValue

Returns:

value as a LuaNumber if numeric

See Also:

• LuaValue.checkint()
• LuaValue.checkdouble()
• LuaValue.checklong()
• LuaValue.optnumber(LuaNumber)
• LuaValue.TNUMBER

checknumber

public LuaNumber checknumber(String msg)

Description copied from class: LuaValue

Check that the value is numeric, and return as a LuaNumber if so, or throw LuaError

Values that are LuaString that can be converted to a number will be converted and returned.

Overrides:

checknumber in class LuaValue

Parameters:

msg - String message to supply if conversion fails

Returns:

value as a LuaNumber if numeric

See Also:

• LuaValue.checkint()
• LuaValue.checkdouble()
• LuaValue.checklong()
• LuaValue.optnumber(LuaNumber)
• LuaValue.TNUMBER

isnumber

public boolean isnumber()

Description copied from class: LuaValue

Check if this is a number

Overrides:

isnumber in class LuaValue

Returns:

true if this is a number, meaning derives from LuaNumber or derives from LuaString and is convertible to a number, otherwise false

See Also:

• LuaValue.tonumber()
• LuaValue.checknumber()
• LuaValue.optnumber(LuaNumber)
• LuaValue.TNUMBER

isint

public boolean isint()

Description copied from class: LuaValue

Check if this is a number and is representable by java int without rounding or truncation

Overrides:

isint in class LuaValue

Returns:

true if this is a number meaning derives from LuaNumber or derives from LuaString and is convertible to a number, and can be represented by int, otherwise false

See Also:

• LuaValue.isinttype()
• LuaValue.islong()
• LuaValue.tonumber()
• LuaValue.checkint()
• LuaValue.optint(int)
• LuaValue.TNUMBER

islong

public boolean islong()

Description copied from class: LuaValue

Check if this is a number and is representable by java long without rounding or truncation

Overrides:

islong in class LuaValue

Returns:

true if this is a number meaning derives from LuaNumber or derives from LuaString and is convertible to a number, and can be represented by long, otherwise false

See Also:

• LuaValue.tonumber()
• LuaValue.checklong()
• LuaValue.optlong(long)
• LuaValue.TNUMBER

tobyte

public byte tobyte()

Description copied from class: LuaValue

Convert to byte if numeric, or 0 if not.

Overrides:

tobyte in class LuaValue

Returns:

Value cast to byte if number or string convertible to number, otherwise 0

See Also:

• LuaValue.toint()
• LuaValue.todouble()
• LuaValue.checknumber()
• LuaValue.isnumber()
• LuaValue.TNUMBER

tochar

public char tochar()

Description copied from class: LuaValue

Convert to char if numeric, or 0 if not.

Overrides:

tochar in class LuaValue

Returns:

Value cast to char if number or string convertible to number, otherwise 0

See Also:

• LuaValue.toint()
• LuaValue.todouble()
• LuaValue.checknumber()
• LuaValue.isnumber()
• LuaValue.TNUMBER

todouble

public double todouble()

Description copied from class: LuaValue

Convert to double if numeric, or 0 if not.

Overrides:

todouble in class LuaValue

Returns:

Value cast to double if number or string convertible to number, otherwise 0

See Also:

• LuaValue.toint()
• LuaValue.tobyte()
• LuaValue.tochar()
• LuaValue.toshort()
• LuaValue.tolong()
• LuaValue.tofloat()
• LuaValue.optdouble(double)
• LuaValue.checknumber()
• LuaValue.isnumber()
• LuaValue.TNUMBER

tofloat

public float tofloat()

Description copied from class: LuaValue

Convert to float if numeric, or 0 if not.

Overrides:

tofloat in class LuaValue

Returns:

Value cast to float if number or string convertible to number, otherwise 0

See Also:

• LuaValue.toint()
• LuaValue.todouble()
• LuaValue.checknumber()
• LuaValue.isnumber()
• LuaValue.TNUMBER

toint

public int toint()

Description copied from class: LuaValue

Convert to int if numeric, or 0 if not.

Overrides:

toint in class LuaValue

Returns:

Value cast to int if number or string convertible to number, otherwise 0

See Also:

• LuaValue.tobyte()
• LuaValue.tochar()
• LuaValue.toshort()
• LuaValue.tolong()
• LuaValue.tofloat()
• LuaValue.todouble()
• LuaValue.optint(int)
• LuaValue.checknumber()
• LuaValue.isnumber()
• LuaValue.TNUMBER

tolong

public long tolong()

Description copied from class: LuaValue

Convert to long if numeric, or 0 if not.

Overrides:

tolong in class LuaValue

Returns:

Value cast to long if number or string convertible to number, otherwise 0

See Also:

• LuaValue.isint()
• LuaValue.isinttype()
• LuaValue.toint()
• LuaValue.todouble()
• LuaValue.optlong(long)
• LuaValue.checknumber()
• LuaValue.isnumber()
• LuaValue.TNUMBER

toshort

public short toshort()

Description copied from class: LuaValue

Convert to short if numeric, or 0 if not.

Overrides:

toshort in class LuaValue

Returns:

Value cast to short if number or string convertible to number, otherwise 0

See Also:

• LuaValue.toint()
• LuaValue.todouble()
• LuaValue.checknumber()
• LuaValue.isnumber()
• LuaValue.TNUMBER

optdouble

public double optdouble(double defval)

Description copied from class: LuaValue

Check that optional argument is a number or string convertible to number and return as double

Overrides:

optdouble in class LuaValue

Parameters:

defval - double to return if this is nil or none

Returns:

this cast to double if numeric, defval if nil or none, throws LuaError otherwise

See Also:

• LuaValue.optint(int)
• LuaValue.checkdouble()
• LuaValue.todouble()
• LuaValue.tonumber()
• LuaValue.isnumber()
• LuaValue.TNUMBER

optint

public int optint(int defval)

Description copied from class: LuaValue

Check that optional argument is a number or string convertible to number and return as int

Overrides:

optint in class LuaValue

Parameters:

defval - int to return if this is nil or none

Returns:

this cast to int if numeric, defval if nil or none, throws LuaError otherwise

See Also:

• LuaValue.optdouble(double)
• LuaValue.optlong(long)
• LuaValue.checkint()
• LuaValue.toint()
• LuaValue.tonumber()
• LuaValue.isnumber()
• LuaValue.TNUMBER

optlong

public long optlong(long defval)

Description copied from class: LuaValue

Check that optional argument is a number or string convertible to number and return as long

Overrides:

optlong in class LuaValue

Parameters:

defval - long to return if this is nil or none

Returns:

this cast to long if numeric, defval if nil or none, throws LuaError otherwise

See Also:

• LuaValue.optdouble(double)
• LuaValue.optint(int)
• LuaValue.checkint()
• LuaValue.toint()
• LuaValue.tonumber()
• LuaValue.isnumber()
• LuaValue.TNUMBER

optnumber

public LuaNumber optnumber(LuaNumber defval)

Description copied from class: LuaValue

Check that optional argument is a number or string convertible to number and return as LuaNumber

Overrides:

optnumber in class LuaValue

Parameters:

defval - LuaNumber to return if this is nil or none

Returns:

this cast to LuaNumber if numeric, defval if nil or none, throws LuaError otherwise

See Also:

• LuaValue.optdouble(double)
• LuaValue.optlong(long)
• LuaValue.optint(int)
• LuaValue.checkint()
• LuaValue.toint()
• LuaValue.tonumber()
• LuaValue.isnumber()
• LuaValue.TNUMBER

optstring

public LuaString optstring(LuaString defval)

Description copied from class: LuaValue

Check that optional argument is a string or number and return as LuaString

Overrides:

optstring in class LuaValue

Parameters:

defval - LuaString to return if this is nil or none

Returns:

this converted to LuaString if a string or number, defval if nil or none, throws LuaError if some other type

See Also:

• LuaValue.tojstring()
• LuaValue.optjstring(String)
• LuaValue.checkstring()
• LuaValue.toString()
• LuaValue.TSTRING

tostring

public LuaValue tostring()

Description copied from class: LuaValue

Conditionally convert to lua string without throwing errors.

In lua all numbers are strings, so this function will return the LuaValue this if it is a string or number, and LuaValue.NIL for all other cases.

This allows values to be tested for their "string-ness" without the penalty of throwing exceptions.

Overrides:

tostring in class LuaValue

Returns:

this if it is a LuaString or LuaNumber, otherwise LuaValue.NIL

See Also:

• LuaValue.tonumber()
• LuaValue.tojstring()
• LuaValue.optstring(LuaString)
• LuaValue.checkstring()
• LuaValue.toString()

optjstring

public String optjstring(String defval)

Description copied from class: LuaValue

Check that optional argument is a string or number and return as Java String

Overrides:

optjstring in class LuaValue

Parameters:

defval - LuaString to return if this is nil or none

Returns:

this converted to String if a string or number, defval if nil or none, throws LuaError if some other type

See Also:

• LuaValue.tojstring()
• LuaValue.optstring(LuaString)
• LuaValue.checkjstring()
• LuaValue.toString()
• LuaValue.TSTRING

strvalue

public LuaString strvalue()

Description copied from class: LuaValue

Convert this value to a string if it is a LuaString or LuaNumber, or throw a LuaError if it is not

Overrides:

strvalue in class LuaValue

Returns:

LuaString corresponding to the value if a string or number

substring

public LuaString substring(int beginIndex,
 int endIndex)

Take a substring using Java zero-based indexes for begin and end or range.

Parameters:

beginIndex - The zero-based index of the first character to include.

endIndex - The zero-based index of position after the last character.

Returns:

LuaString which is a substring whose first character is at offset beginIndex and extending for (endIndex - beginIndex ) characters.

hashCode

public int hashCode()

Overrides:

hashCode in class Object

hashCode

public static int hashCode(byte[] bytes,
 int offset,
 int length)

Compute the hash code of a sequence of bytes within a byte array using lua's rules for string hashes. For long strings, not all bytes are hashed.

Parameters:

bytes - byte array containing the bytes.

offset - offset into the hash for the first byte.

length - number of bytes starting with offset that are part of the string.

Returns:

hash for the string defined by bytes, offset, and length.

equals

public boolean equals(Object o)

Overrides:

equals in class LuaValue

eq

public LuaValue eq(LuaValue val)

Description copied from class: LuaValue

Equals: Perform equality comparison with another value including metatag processing using LuaValue.EQ.

Overrides:

eq in class LuaValue

Parameters:

val - The value to compare with.

Returns:

LuaValue.TRUE if values are comparable and (this == rhs), LuaValue.FALSE if comparable but not equal, LuaValue if metatag processing occurs.

See Also:

• LuaValue.eq_b(LuaValue)
• LuaValue.raweq(LuaValue)
• LuaValue.neq(LuaValue)
• LuaValue.eqmtcall(LuaValue, LuaValue, LuaValue, LuaValue)
• LuaValue.EQ

eq_b

public boolean eq_b(LuaValue val)

Description copied from class: LuaValue

Equals: Perform equality comparison with another value including metatag processing using LuaValue.EQ, and return java boolean

Overrides:

eq_b in class LuaValue

Parameters:

val - The value to compare with.

Returns:

true if values are comparable and (this == rhs), false if comparable but not equal, result converted to java boolean if metatag processing occurs.

See Also:

• LuaValue.eq(LuaValue)
• LuaValue.raweq(LuaValue)
• LuaValue.neq_b(LuaValue)
• LuaValue.eqmtcall(LuaValue, LuaValue, LuaValue, LuaValue)
• LuaValue.EQ

raweq

public boolean raweq(LuaValue val)

Description copied from class: LuaValue

Equals: Perform direct equality comparison with another value without metatag processing.

Overrides:

raweq in class LuaValue

Parameters:

val - The value to compare with.

Returns:

true if (this == rhs), false otherwise

See Also:

• LuaValue.eq(LuaValue)
• LuaValue.raweq(LuaUserdata)
• LuaValue.raweq(LuaString)
• LuaValue.raweq(double)
• LuaValue.raweq(int)
• LuaValue.EQ

raweq

public boolean raweq(LuaString s)

Description copied from class: LuaValue

Equals: Perform direct equality comparison with a LuaString value without metatag processing.

Overrides:

raweq in class LuaValue

Parameters:

s - The LuaString to compare with.

Returns:

true if this is a LuaString and their byte sequences match, otherwise false

equals

public static boolean equals(LuaString a,
 int i,
 LuaString b,
 int j,
 int n)

equals

public static boolean equals(byte[] a,
 int i,
 byte[] b,
 int j,
 int n)

write

public void write(DataOutputStream writer,
 int i,
 int len)
           throws IOException

Throws:

IOException

len

public LuaValue len()

Description copied from class: LuaValue

Length operator: return lua length of object (#this) including metatag processing as java int

Overrides:

len in class LuaValue

Returns:

length as defined by the lua # operator or metatag processing result

length

public int length()

Description copied from class: LuaValue

Length operator: return lua length of object (#this) including metatag processing as java int

Overrides:

length in class LuaValue

Returns:

length as defined by the lua # operator or metatag processing result converted to java int using LuaValue.toint()

rawlen

public int rawlen()

Description copied from class: LuaValue

Get raw length of table or string without metatag processing.

Overrides:

rawlen in class LuaValue

Returns:

the length of the table or string.

luaByte

public int luaByte(int index)

charAt

public int charAt(int index)

checkjstring

public String checkjstring()

Description copied from class: LuaValue

Convert this value to a Java String.

The string representations here will roughly match what is produced by the C lua distribution, however hash codes have no relationship, and there may be differences in number formatting.

Overrides:

checkjstring in class LuaValue

Returns:

String representation of the value

See Also:

• LuaValue.checkstring()
• LuaValue.optjstring(String)
• LuaValue.tojstring()
• LuaValue.isstring()
• LuaValue.TSTRING

checkstring

public LuaString checkstring()

Description copied from class: LuaValue

Check that this is a lua string, or throw LuaError if it is not.

In lua all numbers are strings, so this will succeed for anything that derives from LuaString or LuaNumber. Numbers will be converted to LuaString.

Overrides:

checkstring in class LuaValue

Returns:

LuaString representation of the value if it is a LuaString or LuaNumber

See Also:

• LuaValue.checkjstring()
• LuaValue.optstring(LuaString)
• LuaValue.tostring()
• LuaValue.isstring()
• LuaValue.TSTRING

toInputStream

public InputStream toInputStream()

Convert value to an input stream.

Returns:

InputStream whose data matches the bytes in this LuaString

copyInto

public void copyInto(int strOffset,
 byte[] bytes,
 int arrayOffset,
 int len)

Copy the bytes of the string into the given byte array.

Parameters:

strOffset - offset from which to copy

bytes - destination byte array

arrayOffset - offset in destination

len - number of bytes to copy

indexOfAny

public int indexOfAny(LuaString accept)

Java version of strpbrk - find index of any byte that in an accept string.

Parameters:

accept - LuaString containing characters to look for.

Returns:

index of first match in the accept string, or -1 if not found.

indexOf

public int indexOf(byte b,
 int start)

Find the index of a byte starting at a point in this string

Parameters:

b - the byte to look for

start - the first index in the string

Returns:

index of first match found, or -1 if not found.

indexOf

public int indexOf(LuaString s,
 int start)

Find the index of a string starting at a point in this string

Parameters:

s - the string to search for

start - the first index in the string

Returns:

index of first match found, or -1 if not found.

lastIndexOf

public int lastIndexOf(LuaString s)

Find the last index of a string in this string

Parameters:

s - the string to search for

Returns:

index of last match found, or -1 if not found.

decodeAsUtf8

public static String decodeAsUtf8(byte[] bytes,
 int offset,
 int length)

Convert to Java String interpreting as utf8 characters.

Parameters:

bytes - byte array in UTF8 encoding to convert

offset - starting index in byte array

length - number of bytes to convert

Returns:

Java String corresponding to the value of bytes interpreted using UTF8

See Also:

• lengthAsUtf8(char[])
• encodeToUtf8(char[], int, byte[], int)
• isValidUtf8()

lengthAsUtf8

public static int lengthAsUtf8(char[] chars)

Count the number of bytes required to encode the string as UTF-8.

Parameters:

chars - Array of unicode characters to be encoded as UTF-8

Returns:

count of bytes needed to encode using UTF-8

See Also:

• encodeToUtf8(char[], int, byte[], int)
• decodeAsUtf8(byte[], int, int)
• isValidUtf8()

encodeToUtf8

public static int encodeToUtf8(char[] chars,
 int nchars,
 byte[] bytes,
 int off)

Encode the given Java string as UTF-8 bytes, writing the result to bytes starting at offset.

The string should be measured first with lengthAsUtf8 to make sure the given byte array is large enough.

Parameters:

chars - Array of unicode characters to be encoded as UTF-8

nchars - Number of characters in the array to convert.

bytes - byte array to hold the result

off - offset into the byte array to start writing

Returns:

number of bytes converted.

See Also:

• lengthAsUtf8(char[])
• decodeAsUtf8(byte[], int, int)
• isValidUtf8()

isValidUtf8

public boolean isValidUtf8()

Check that a byte sequence is valid UTF-8

Returns:

true if it is valid UTF-8, otherwise false

See Also:

• lengthAsUtf8(char[])
• encodeToUtf8(char[], int, byte[], int)
• decodeAsUtf8(byte[], int, int)

tonumber

public LuaValue tonumber()

convert to a number using baee 10 or base 16 if it starts with '0x', or NIL if it can't be converted

Overrides:

tonumber in class LuaValue

Returns:

IntValue, DoubleValue, or NIL depending on the content of the string.

See Also:

• LuaValue.tonumber()

tonumber

public LuaValue tonumber(int base)

convert to a number using a supplied base, or NIL if it can't be converted

Parameters:

base - the base to use, such as 10

Returns:

IntValue, DoubleValue, or NIL depending on the content of the string.

See Also:

• LuaValue.tonumber()

scannumber

public double scannumber()

Convert to a number in base 10, or base 16 if the string starts with '0x', or return Double.NaN if it cannot be converted to a number.

Returns:

double value if conversion is valid, or Double.NaN if not

scannumber

public double scannumber(int base)

Convert to a number in a base, or return Double.NaN if not a number.

Parameters:

base - the base to use between 2 and 36

Returns:

double value if conversion is valid, or Double.NaN if not

printToStream

public void printToStream(PrintStream ps)

Print the bytes of the LuaString to a PrintStream as if it were an ASCII string, quoting and escaping control characters.

Parameters:

ps - PrintStream to print to.