OpCodes (HtmlUnit-XPath 4.3.0 API)

java.lang.Object
- org.htmlunit.xpath.compiler.OpCodes

```
public class OpCodes
extends Object
```
Operations codes for XPath.
Code for the descriptions of the operations codes: [UPPER CASE] indicates a literal value, [lower case] is a description of a value, ([length] always indicates the length of the operation, including the operations code and the length integer.) {UPPER CASE} indicates the given production, {description} is the description of a new production, (For instance, {boolean expression} means some expression that should be resolved to a boolean.) * means that it occurs zero or more times, + means that it occurs one or more times, ? means that it is optional.
returns: indicates what the production should return.

Field Summary

Fields
Modifier and Type	Field and Description
`static int`	`AXES_END_TYPES` The end of the axes types.
`static int`	`AXES_START_TYPES` [FROM_stepType] [length, including predicates] [length of just the step, without the predicates] {node test} {predicates}?
`static int`	`ELEMWILDCARD` [ELEMWILDCARD] Means ELEMWILDCARD ("*"), used instead of string index in some places.
`static int`	`EMPTY` [EMPTY] Empty slot to indicate NULL.
`static int`	`ENDOP` [ENDOP] Some operators may like to have a terminator.
`static int`	`FROM_ANCESTORS` ancestor axes opcode.
`static int`	`FROM_ANCESTORS_OR_SELF` ancestor-or-self axes opcode.
`static int`	`FROM_ATTRIBUTES` attribute axes opcode.
`static int`	`FROM_CHILDREN` children axes opcode.
`static int`	`FROM_DESCENDANTS` descendants axes opcode.
`static int`	`FROM_DESCENDANTS_OR_SELF` descendants-of-self axes opcode.
`static int`	`FROM_FOLLOWING` following axes opcode.
`static int`	`FROM_FOLLOWING_SIBLINGS` following-siblings axes opcode.
`static int`	`FROM_NAMESPACE` namespace axes opcode.
`static int`	`FROM_PARENT` parent axes opcode.
`static int`	`FROM_PRECEDING` preceding axes opcode.
`static int`	`FROM_PRECEDING_SIBLINGS` preceding-sibling axes opcode.
`static int`	`FROM_ROOT` '/' axes opcode.
`static int`	`FROM_SELF` self axes opcode.
`static int`	`MATCH_ANY_ANCESTOR` For match patterns.
`static int`	`MATCH_ATTRIBUTE` For match patterns.
`static int`	`MATCH_IMMEDIATE_ANCESTOR` For match patterns.
`static int`	`NODENAME` [NODENAME] [index to ns token or EMPTY] [index to name token]
`static int`	`NODETYPE_ANYELEMENT` [NODETYPE_ANY] No size or arguments.
`static int`	`NODETYPE_COMMENT` [NODETYPE_COMMENT] No size or arguments.
`static int`	`NODETYPE_FUNCTEST` [NODETYPE_ANY] No size or arguments.
`static int`	`NODETYPE_NODE` [NODETYPE_NODE] No size or arguments.
`static int`	`NODETYPE_PI` [NODETYPE_PI] [index to token] Note: must not overlap function OP number!
`static int`	`NODETYPE_ROOT` [NODETYPE_ROOT] No size or arguments.
`static int`	`NODETYPE_TEXT` [NODETYPE_TEXT] No size or arguments.
`static int`	`OP_AND` [OP_AND] [length] {boolean expression} {boolean expression}
`static int`	`OP_ARGUMENT` [OP_ARGUMENT] (Function argument.) [length] {expression}
`static int`	`OP_BOOL` [OP_BOOL] (cast operation) [length] {expression}
`static int`	`OP_DIV` [OP_DIV] [length] {number expression} {number expression}
`static int`	`OP_EQUALS` [OP_EQUALS] [length] {expression} {expression}
`static int`	`OP_FUNCTION` [OP_FUNCTION] [length] [FUNC_name] {OP_ARGUMENT} [ENDOP]
`static int`	`OP_GROUP` [OP_GROUP] [length] {expression}
`static int`	`OP_GT` [OP_GT] (greater-than) [length] {number expression} {number expression}
`static int`	`OP_GTE` [OP_GTE] (greater-than-or-equals) [length] {number expression} {number expression}
`static int`	`OP_LITERAL` [OP_LITERAL] [3] [index to token]
`static int`	`OP_LOCATIONPATH` [OP_LOCATIONPATH] [length] {FROM_stepType} \| {function} {predicate} [ENDOP]
`static int`	`OP_LOCATIONPATHPATTERN` [OP_LOCATIONPATHPATTERN] [length] {FROM_stepType} \| {function}{predicate} [ENDOP] returns: XNodeSet
`static int`	`OP_LT` [OP_LT] (less-than) [length] {number expression} {number expression}
`static int`	`OP_LTE` [OP_LTE] (less-than-or-equals) [length] {number expression} {number expression}
`static int`	`OP_MATCHPATTERN` [OP_MATCHPATTERN] [length] {PathExpr}+
`static int`	`OP_MINUS` [OP_MINUS] [length] {number expression} {number expression}
`static int`	`OP_MOD` [OP_MOD] [length] {number expression} {number expression}
`static int`	`OP_MULT` [OP_MULT] [length] {number expression} {number expression}
`static int`	`OP_NEG` [OP_NEG] [length] {number expression}
`static int`	`OP_NOTEQUALS` [OP_NOTEQUALS] [length] {expression} {expression}
`static int`	`OP_NUMBER` [OP_NUMBER] (cast operation) [length] {expression}
`static int`	`OP_NUMBERLIT` [OP_NUMBERLIT] (Number literal.) [3] [index to token]
`static int`	`OP_OR` [OP_OR] [length] {boolean expression} {boolean expression}
`static int`	`OP_PLUS` [OP_PLUS] [length] {number expression} {number expression}
`static int`	`OP_PREDICATE` [OP_PREDICATE] [length] {expression} [ENDOP] (For safety)
`static int`	`OP_QUO` [OP_QUO] [length] {number expression} {number expression}
`static int`	`OP_STRING` [OP_STRING] (cast operation) [length] {expression}
`static int`	`OP_UNION` [OP_UNION] [length] {PathExpr}+
`static int`	`OP_VARIABLE` [OP_VARIABLE] [4] [index to namespace token, or EMPTY] [index to function name token]
`static int`	`OP_XPATH` [OP_XPATH] [length] {expression}

Constructor Summary

Constructors
Constructor and Description

OpCodes()

Constructors
Constructor and Description
`OpCodes()`

Method Summary
- Methods inherited from class java.lang.Object
  clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - ENDOP
```
public static final int ENDOP
```
    [ENDOP] Some operators may like to have a terminator.
    
    See Also:
    
    Constant Field Values
  - EMPTY
```
public static final int EMPTY
```
    [EMPTY] Empty slot to indicate NULL.
    
    See Also:
    
    Constant Field Values
  - ELEMWILDCARD
```
public static final int ELEMWILDCARD
```
    [ELEMWILDCARD] Means ELEMWILDCARD ("*"), used instead of string index in some places.
    
    See Also:
    
    Constant Field Values
  - OP_XPATH
```
public static final int OP_XPATH
```
    [OP_XPATH] [length] {expression}
    returns: XNodeSet XNumber XString XBoolean XRTree XObject
    
    See Also:
    
    Constant Field Values
  - OP_OR
```
public static final int OP_OR
```
    [OP_OR] [length] {boolean expression} {boolean expression}
    returns: XBoolean
    
    See Also:
    
    Constant Field Values
  - OP_AND
```
public static final int OP_AND
```
    [OP_AND] [length] {boolean expression} {boolean expression}
    returns: XBoolean
    
    See Also:
    
    Constant Field Values
  - OP_NOTEQUALS
```
public static final int OP_NOTEQUALS
```
    [OP_NOTEQUALS] [length] {expression} {expression}
    returns: XBoolean
    
    See Also:
    
    Constant Field Values
  - OP_EQUALS
```
public static final int OP_EQUALS
```
    [OP_EQUALS] [length] {expression} {expression}
    returns: XBoolean
    
    See Also:
    
    Constant Field Values
  - OP_LTE
```
public static final int OP_LTE
```
    [OP_LTE] (less-than-or-equals) [length] {number expression} {number expression}
    returns: XBoolean
    
    See Also:
    
    Constant Field Values
  - OP_LT
```
public static final int OP_LT
```
    [OP_LT] (less-than) [length] {number expression} {number expression}
    returns: XBoolean
    
    See Also:
    
    Constant Field Values
  - OP_GTE
```
public static final int OP_GTE
```
    [OP_GTE] (greater-than-or-equals) [length] {number expression} {number expression}
    returns: XBoolean
    
    See Also:
    
    Constant Field Values
  - OP_GT
```
public static final int OP_GT
```
    [OP_GT] (greater-than) [length] {number expression} {number expression}
    returns: XBoolean
    
    See Also:
    
    Constant Field Values
  - OP_PLUS
```
public static final int OP_PLUS
```
    [OP_PLUS] [length] {number expression} {number expression}
    returns: XNumber
    
    See Also:
    
    Constant Field Values
  - OP_MINUS
```
public static final int OP_MINUS
```
    [OP_MINUS] [length] {number expression} {number expression}
    returns: XNumber
    
    See Also:
    
    Constant Field Values
  - OP_MULT
```
public static final int OP_MULT
```
    [OP_MULT] [length] {number expression} {number expression}
    returns: XNumber
    
    See Also:
    
    Constant Field Values
  - OP_DIV
```
public static final int OP_DIV
```
    [OP_DIV] [length] {number expression} {number expression}
    returns: XNumber
    
    See Also:
    
    Constant Field Values
  - OP_MOD
```
public static final int OP_MOD
```
    [OP_MOD] [length] {number expression} {number expression}
    returns: XNumber
    
    See Also:
    
    Constant Field Values
  - OP_QUO
```
public static final int OP_QUO
```
    [OP_QUO] [length] {number expression} {number expression}
    returns: XNumber
    
    See Also:
    
    Constant Field Values
  - OP_NEG
```
public static final int OP_NEG
```
    [OP_NEG] [length] {number expression}
    returns: XNumber
    
    See Also:
    
    Constant Field Values
  - OP_STRING
```
public static final int OP_STRING
```
    [OP_STRING] (cast operation) [length] {expression}
    returns: XString
    
    See Also:
    
    Constant Field Values
  - OP_BOOL
```
public static final int OP_BOOL
```
    [OP_BOOL] (cast operation) [length] {expression}
    returns: XBoolean
    
    See Also:
    
    Constant Field Values
  - OP_NUMBER
```
public static final int OP_NUMBER
```
    [OP_NUMBER] (cast operation) [length] {expression}
    returns: XBoolean
    
    See Also:
    
    Constant Field Values
  - OP_UNION
```
public static final int OP_UNION
```
    [OP_UNION] [length] {PathExpr}+
    returns: XNodeSet
    
    See Also:
    
    Constant Field Values
  - OP_LITERAL
```
public static final int OP_LITERAL
```
    [OP_LITERAL] [3] [index to token]
    returns: XString
    
    See Also:
    
    Constant Field Values
  - OP_VARIABLE
```
public static final int OP_VARIABLE
```
    [OP_VARIABLE] [4] [index to namespace token, or EMPTY] [index to function name token]
    returns: XString
    
    See Also:
    
    Constant Field Values
  - OP_GROUP
```
public static final int OP_GROUP
```
    [OP_GROUP] [length] {expression}
    returns: XNodeSet XNumber XString XBoolean XRTree XObject
    
    See Also:
    
    Constant Field Values
  - OP_FUNCTION
```
public static final int OP_FUNCTION
```
    [OP_FUNCTION] [length] [FUNC_name] {OP_ARGUMENT} [ENDOP]
    returns: XNodeSet XNumber XString XBoolean XRTree XObject
    
    See Also:
    
    Constant Field Values
  - OP_ARGUMENT
```
public static final int OP_ARGUMENT
```
    [OP_ARGUMENT] (Function argument.) [length] {expression}
    returns: XNodeSet XNumber XString XBoolean XRTree XObject
    
    See Also:
    
    Constant Field Values
  - OP_NUMBERLIT
```
public static final int OP_NUMBERLIT
```
    [OP_NUMBERLIT] (Number literal.) [3] [index to token]
    returns: XString
    
    See Also:
    
    Constant Field Values
  - OP_LOCATIONPATH
```
public static final int OP_LOCATIONPATH
```
    [OP_LOCATIONPATH] [length] {FROM_stepType} | {function} {predicate} [ENDOP]
    (Note that element and attribute namespaces and names can be wildcarded '*'.)
    returns: XNodeSet
    
    See Also:
    
    Constant Field Values
  - OP_PREDICATE
```
public static final int OP_PREDICATE
```
    [OP_PREDICATE] [length] {expression} [ENDOP] (For safety)
    returns: XBoolean or XNumber
    
    See Also:
    
    Constant Field Values
  - OP_MATCHPATTERN
```
public static final int OP_MATCHPATTERN
```
    [OP_MATCHPATTERN] [length] {PathExpr}+
    returns: XNodeSet
    
    See Also:
    
    Constant Field Values
  - OP_LOCATIONPATHPATTERN
```
public static final int OP_LOCATIONPATHPATTERN
```
    [OP_LOCATIONPATHPATTERN] [length] {FROM_stepType} | {function}{predicate} [ENDOP] returns: XNodeSet
    
    See Also:
    
    Constant Field Values
  - NODETYPE_COMMENT
```
public static final int NODETYPE_COMMENT
```
    [NODETYPE_COMMENT] No size or arguments. Note: must not overlap function OP number!
    returns: XBoolean
    
    See Also:
    
    Constant Field Values
  - NODETYPE_TEXT
```
public static final int NODETYPE_TEXT
```
    [NODETYPE_TEXT] No size or arguments. Note: must not overlap function OP number!
    returns: XBoolean
    
    See Also:
    
    Constant Field Values
  - NODETYPE_PI
```
public static final int NODETYPE_PI
```
    [NODETYPE_PI] [index to token] Note: must not overlap function OP number!
    returns: XBoolean
    
    See Also:
    
    Constant Field Values
  - NODETYPE_NODE
```
public static final int NODETYPE_NODE
```
    [NODETYPE_NODE] No size or arguments. Note: must not overlap function OP number!
    returns: XBoolean
    
    See Also:
    
    Constant Field Values
  - NODENAME
```
public static final int NODENAME
```
    [NODENAME] [index to ns token or EMPTY] [index to name token]
    returns: XBoolean
    
    See Also:
    
    Constant Field Values
  - NODETYPE_ROOT
```
public static final int NODETYPE_ROOT
```
    [NODETYPE_ROOT] No size or arguments.
    returns: XBoolean
    
    See Also:
    
    Constant Field Values
  - NODETYPE_ANYELEMENT
```
public static final int NODETYPE_ANYELEMENT
```
    [NODETYPE_ANY] No size or arguments.
    returns: XBoolean
    
    See Also:
    
    Constant Field Values
  - NODETYPE_FUNCTEST
```
public static final int NODETYPE_FUNCTEST
```
    [NODETYPE_ANY] No size or arguments.
    returns: XBoolean
    
    See Also:
    
    Constant Field Values
  - AXES_START_TYPES
```
public static final int AXES_START_TYPES
```
    [FROM_stepType] [length, including predicates] [length of just the step, without the predicates] {node test} {predicates}?
    returns: XBoolean
    
    See Also:
    
    Constant Field Values
  - FROM_ANCESTORS
```
public static final int FROM_ANCESTORS
```
    ancestor axes opcode.
    
    See Also:
    
    Constant Field Values
  - FROM_ANCESTORS_OR_SELF
```
public static final int FROM_ANCESTORS_OR_SELF
```
    ancestor-or-self axes opcode.
    
    See Also:
    
    Constant Field Values
  - FROM_ATTRIBUTES
```
public static final int FROM_ATTRIBUTES
```
    attribute axes opcode.
    
    See Also:
    
    Constant Field Values
  - FROM_CHILDREN
```
public static final int FROM_CHILDREN
```
    children axes opcode.
    
    See Also:
    
    Constant Field Values
  - FROM_DESCENDANTS
```
public static final int FROM_DESCENDANTS
```
    descendants axes opcode.
    
    See Also:
    
    Constant Field Values
  - FROM_DESCENDANTS_OR_SELF
```
public static final int FROM_DESCENDANTS_OR_SELF
```
    descendants-of-self axes opcode.
    
    See Also:
    
    Constant Field Values
  - FROM_FOLLOWING
```
public static final int FROM_FOLLOWING
```
    following axes opcode.
    
    See Also:
    
    Constant Field Values
  - FROM_FOLLOWING_SIBLINGS
```
public static final int FROM_FOLLOWING_SIBLINGS
```
    following-siblings axes opcode.
    
    See Also:
    
    Constant Field Values
  - FROM_PARENT
```
public static final int FROM_PARENT
```
    parent axes opcode.
    
    See Also:
    
    Constant Field Values
  - FROM_PRECEDING
```
public static final int FROM_PRECEDING
```
    preceding axes opcode.
    
    See Also:
    
    Constant Field Values
  - FROM_PRECEDING_SIBLINGS
```
public static final int FROM_PRECEDING_SIBLINGS
```
    preceding-sibling axes opcode.
    
    See Also:
    
    Constant Field Values
  - FROM_SELF
```
public static final int FROM_SELF
```
    self axes opcode.
    
    See Also:
    
    Constant Field Values
  - FROM_NAMESPACE
```
public static final int FROM_NAMESPACE
```
    namespace axes opcode.
    
    See Also:
    
    Constant Field Values
  - FROM_ROOT
```
public static final int FROM_ROOT
```
    '/' axes opcode.
    
    See Also:
    
    Constant Field Values
  - MATCH_ATTRIBUTE
```
public static final int MATCH_ATTRIBUTE
```
    For match patterns.
    
    See Also:
    
    Constant Field Values
  - MATCH_ANY_ANCESTOR
```
public static final int MATCH_ANY_ANCESTOR
```
    For match patterns.
    
    See Also:
    
    Constant Field Values
  - MATCH_IMMEDIATE_ANCESTOR
```
public static final int MATCH_IMMEDIATE_ANCESTOR
```
    For match patterns.
    
    See Also:
    
    Constant Field Values
  - AXES_END_TYPES
```
public static final int AXES_END_TYPES
```
    The end of the axes types.
    
    See Also:
    
    Constant Field Values
- Constructor Detail
  - OpCodes
```
public OpCodes()
```

Class OpCodes

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

ENDOP

EMPTY

ELEMWILDCARD

OP_XPATH

OP_OR

OP_AND

OP_NOTEQUALS

OP_EQUALS

OP_LTE

OP_LT

OP_GTE

OP_GT

OP_PLUS

OP_MINUS

OP_MULT

OP_DIV

OP_MOD

OP_QUO

OP_NEG

OP_STRING

OP_BOOL

OP_NUMBER

OP_UNION

OP_LITERAL

OP_VARIABLE

OP_GROUP

OP_FUNCTION

OP_ARGUMENT

OP_NUMBERLIT

OP_LOCATIONPATH

OP_PREDICATE

OP_MATCHPATTERN

OP_LOCATIONPATHPATTERN

NODETYPE_COMMENT

NODETYPE_TEXT

NODETYPE_PI

NODETYPE_NODE

NODENAME

NODETYPE_ROOT

NODETYPE_ANYELEMENT

NODETYPE_FUNCTEST

AXES_START_TYPES

FROM_ANCESTORS

FROM_ANCESTORS_OR_SELF

FROM_ATTRIBUTES

FROM_CHILDREN

FROM_DESCENDANTS

FROM_DESCENDANTS_OR_SELF

FROM_FOLLOWING

FROM_FOLLOWING_SIBLINGS

FROM_PARENT

FROM_PRECEDING

FROM_PRECEDING_SIBLINGS

FROM_SELF

FROM_NAMESPACE

FROM_ROOT

MATCH_ATTRIBUTE

MATCH_ANY_ANCESTOR

MATCH_IMMEDIATE_ANCESTOR

AXES_END_TYPES

Constructor Detail

OpCodes