org.mozilla.javascript.ast

## Class ExpressionStatement

- java.lang.Object
- - org.mozilla.javascript.Node
  - - org.mozilla.javascript.ast.AstNode
    - - org.mozilla.javascript.ast.ExpressionStatement

All Implemented Interfaces:
  java.lang.Comparable<AstNode>, java.lang.Iterable<Node>

    public class ExpressionStatement
    extends AstNode

AST node representing an expression in a statement context. The node type is `Token.EXPR_VOID` if inside a function, or else `Token.EXPR_RESULT` if inside a script.

### Nested Class Summary

### Nested classes/interfaces inherited from class org.mozilla.javascript.ast.AstNode

`AstNode.DebugPrintVisitor, AstNode.PositionComparator`

### Nested classes/interfaces inherited from class org.mozilla.javascript.Node

`Node.NodeIterator`

### Field Summary

### Fields inherited from class org.mozilla.javascript.ast.AstNode

`length, parent, position`

### Fields inherited from class org.mozilla.javascript.Node

`ATTRIBUTE_FLAG, BOTH, CASEARRAY_PROP, CATCH_SCOPE_PROP, CONTROL_BLOCK_PROP, DECR_FLAG, DESCENDANTS_FLAG, DESTRUCTURING_ARRAY_LENGTH, DESTRUCTURING_NAMES, DESTRUCTURING_PARAMS, DESTRUCTURING_SHORTHAND, DIRECTCALL_PROP, END_DROPS_OFF, END_RETURNS, END_RETURNS_VALUE, END_UNREACHED, END_YIELDS, EXPRESSION_CLOSURE_PROP, first, FUNCTION_PROP, GENERATOR_END_PROP, INCRDECR_PROP, ISNUMBER_PROP, JSDOC_PROP, LABEL_ID_PROP, last, LAST_PROP, LEFT, lineno, LOCAL_BLOCK_PROP, LOCAL_PROP, MEMBER_TYPE_PROP, NAME_PROP, next, NON_SPECIALCALL, OBJECT_IDS_PROP, PARENTHESIZED_PROP, POST_FLAG, PROPERTY_FLAG, propListHead, REGEXP_PROP, RIGHT, SKIP_INDEXES_PROP, SPECIALCALL_EVAL, SPECIALCALL_PROP, SPECIALCALL_WITH, TARGETBLOCK_PROP, type, VARIABLE_PROP`

### Constructor Summary

Constructors
Constructor and Description
`ExpressionStatement()`
`ExpressionStatement(AstNode expr)` Constructs a new `ExpressionStatement` wrapping the specified expression.
`ExpressionStatement(AstNode expr, boolean hasResult)` Constructs a new `ExpressionStatement` wrapping the specified expression.
`ExpressionStatement(int pos, int len)`
`ExpressionStatement(int pos, int len, AstNode expr)` Constructs a new `ExpressionStatement`

### Method Summary

Methods
`AstNode` `getExpression()` Returns the wrapped expression
`boolean` `hasSideEffects()` Returns true if this node has side effects
`void` `setExpression(AstNode expression)` Sets the wrapped expression, and sets its parent to this node.
`void` `setHasResult()` Called by the parser to set node type to EXPR_RESULT if this node is not within a Function.
`java.lang.String` `toSource(int depth)` Emits source code for this node.
`void` `visit(NodeVisitor v)` Visits this node, then the wrapped statement.

### Methods inherited from class org.mozilla.javascript.ast.AstNode

`addChild, assertNotNull, codeBug, compareTo, debugPrint, depth, getAbsolutePosition, getAstRoot, getEnclosingFunction, getEnclosingScope, getLength, getLineno, getParent, getPosition, makeIndent, operatorToString, printList, setBounds, setLength, setParent, setPosition, setRelative, shortName, toSource`

### Methods inherited from class org.mozilla.javascript.Node

`addChildAfter, addChildBefore, addChildrenToBack, addChildrenToFront, addChildToBack, addChildToFront, getChildBefore, getDouble, getExistingIntProp, getFirstChild, getIntProp, getJsDoc, getJsDocNode, getLastChild, getLastSibling, getNext, getProp, getScope, getString, getType, hasChildren, hasConsistentReturnUsage, iterator, labelId, labelId, newNumber, newString, newString, newTarget, putIntProp, putProp, removeChild, removeChildren, removeProp, replaceChild, replaceChildAfter, resetTargets, setDouble, setJsDocNode, setLineno, setScope, setString, setType, toString, toStringTree`

### Methods inherited from class java.lang.Object

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

### Constructor Detail

#### ExpressionStatement

    public ExpressionStatement()

#### ExpressionStatement

    public ExpressionStatement(AstNode expr,
                       boolean hasResult)

Constructs a new `ExpressionStatement` wrapping the specified expression. Sets this node's position to the position of the wrapped node, and sets the wrapped node's position to zero. Sets this node's length to the length of the wrapped node.

Parameters:
  `expr` - the wrapped expression
  `hasResult` - `true` if this expression has side effects. If true, sets node type to EXPR_RESULT, else to EXPR_VOID.

#### ExpressionStatement

    public ExpressionStatement(AstNode expr)

Constructs a new `ExpressionStatement` wrapping the specified expression. Sets this node's position to the position of the wrapped node, and sets the wrapped node's position to zero. Sets this node's length to the length of the wrapped node.

Parameters:
  `expr` - the wrapped expression

#### ExpressionStatement

    public ExpressionStatement(int pos,
                       int len)

#### ExpressionStatement

    public ExpressionStatement(int pos,
                       int len,
                       AstNode expr)

Constructs a new `ExpressionStatement`

Parameters:
  `expr` - the wrapped `AstNode`. The `ExpressionStatement`'s bounds are set to those of expr, and expr's parent is set to this node.
Throws:
  `java.lang.IllegalArgumentException` - if `expr` is null

### Method Detail

#### setHasResult

    public void setHasResult()

Called by the parser to set node type to EXPR_RESULT if this node is not within a Function.

#### getExpression

    public AstNode getExpression()

Returns the wrapped expression

#### setExpression

    public void setExpression(AstNode expression)

Sets the wrapped expression, and sets its parent to this node.

Throws:
  `IllegalArgumentException}` - if expression is `null`

#### hasSideEffects

    public boolean hasSideEffects()

Returns true if this node has side effects

Overrides:
  `hasSideEffects` in class `AstNode`
Throws:
  `java.lang.IllegalStateException` - if expression has not yet been set.

#### toSource

    public java.lang.String toSource(int depth)

Description copied from class: `AstNode`
Emits source code for this node. Callee is responsible for calling this function recursively on children, incrementing indent as appropriate.

Note: if the parser was in error-recovery mode, some AST nodes may have `null` children that are expected to be non-`null` when no errors are present. In this situation, the behavior of the `toSource` method is undefined: `toSource` implementations may assume that the AST node is error-free, since it is intended to be invoked only at runtime after a successful parse.

Specified by:
  `toSource` in class `AstNode`
Parameters:
  `depth` - the current recursion depth, typically beginning at 0 when called on the root node.

#### visit

    public void visit(NodeVisitor v)

Visits this node, then the wrapped statement.

Specified by:
  `visit` in class `AstNode`
Parameters:
  `v` - the object to call with this node and its children