Getters

Get properties of an expression. More...

Functions
bool	expression_get_boolean (const expression *e)
	Get an expression's boolean. More...
const char *	expression_get_identifier (const expression *e)
	Get an expression's identifier. More...
expression *	expression_get_left (const expression *e)
	Get an expression's left operand. More...
long int	expression_get_number (const expression *e)
	Get an expression's number. More...
expression *	expression_get_right (const expression *e)
	Get an expression's right operand. More...
expression_type	expression_get_type (const expression *e)
	Get an expression's type. More...
bool	expression_is_boolean (const expression *e)
	Determine whether an expression is a boolean expression. More...
bool	expression_is_false (const expression *e)
	Determine whether an expression is false. More...
bool	expression_is_identifier (const expression *e)
	Determine whether an expression is an identifier. More...
bool	expression_is_number (const expression *e)
	Determine whether an expression is a number expression. More...
bool	expression_is_one (const expression *e)
	Determine whether an expression is 1. More...
bool	expression_is_true (const expression *e)
	Determine whether an expression is true. More...
bool	expression_is_zero (const expression *e)
	Determine whether an expression is 0. More...

Detailed Description

Get properties of an expression.

Since

version 1.0.0

Expression type inspection

The type of an expression can and should be inspected using expression_get_type().

Constant expressions have dedicated inspection functions:

• expression_is_boolean()
• expression_is_number()
• expression_is_identifier()

Number expressions

If an expression is a number, it is possible to:

• get its value: expression_get_number()
• determine whether it is evaluates to 0: expression_is_zero()
• determine whether it is evaluates to 1: expression_is_one()

Boolean expressions

If an expression is a boolean value, it is possible to:

• get its value: expression_get_boolean()
• determine whether it is evaluates to true: expression_is_true()
• determine whether it is evaluates to false: expression_is_false()

Other expressions

For identifier expressions, the identifier can be obtained with expression_get_identifier().

The left and right operands of a binary operation can be obtained with expression_get_left() and expression_get_right().

Warning

Please note that it is only safe to use the appropriate getter(s) on an expression:

Expression type	Appropriate getter(s)
EXPR_NUMBER	expression_get_number()
EXPR_TRUE	expression_get_boolean()
EXPR_FALSE	expression_get_boolean()
EXPR_ID	expression_get_identifier()
EXPR_NOT	expression_get_left()
EXPR_NEG	expression_get_left()
other types != EXPR_UNKNOWN	expression_get_left(), expression_get_right()

Function Documentation

bool expression_get_boolean ( const expression *  e )

related

Get an expression's boolean.

Since

version 1.0.0

Parameters

e	Expression of interest.

Returns

Boolean.

const char * expression_get_identifier ( const expression *  e )

related

Get an expression's identifier.

Since

version 1.0.0

Parameters

e	Expression of interest.

Returns

Identifier.

expression * expression_get_left ( const expression *  e )

related

Get an expression's left operand.

Since

version 1.0.0

Parameters

e	Expression of interest.

Returns

Left operand.

long int expression_get_number ( const expression *  e )

related

Get an expression's number.

Since

version 1.0.0

Parameters

e	Expression of interest.

Returns

Number.

expression * expression_get_right ( const expression *  e )

related

Get an expression's right operand.

Since

version 1.0.0

Parameters

e	Expression of interest.

Returns

Right operand.

expression_type expression_get_type ( const expression *  e )

related

Get an expression's type.

Since

version 1.0.0

Parameters

e	Expression of interest.

Returns

The expression's type.

bool expression_is_boolean ( const expression *  e )

related

Determine whether an expression is a boolean expression.

Since

version 1.0.0

Parameters

e	Expression of interest.

Return values

true	if the expression is a boolean.
false	otherwise.

bool expression_is_false ( const expression *  e )

related

Determine whether an expression is false.

Since

version 1.0.0

Parameters

e	Expression of interest.

Return values

true	if the expression is true.
otherwise.

bool expression_is_identifier ( const expression *  e )

related

Determine whether an expression is an identifier.

Since

version 1.0.0

Parameters

e	Expression of interest.

Return values

true	if the expression is an identifier.
false	otherwise.

bool expression_is_number ( const expression *  e )

related

Determine whether an expression is a number expression.

Since

version 1.0.0

Parameters

e	Expression of interest.

Return values

true	if the expression is a number.
false	otherwise.

bool expression_is_one ( const expression *  e )

related

Determine whether an expression is 1.

Since

version 1.0.0

Parameters

e	Expression of interest.

Return values

true	if the expression is 1.
otherwise.

bool expression_is_true ( const expression *  e )

related

Determine whether an expression is true.

Since

version 1.0.0

Parameters

e	Expression of interest.

Return values

true	if the expression is true.
otherwise.

bool expression_is_zero ( const expression *  e )

related

Determine whether an expression is 0.

Since

version 1.0.0

Parameters

e	Expression of interest.

Return values

true	if the expression is 0.
otherwise.