Package com.inductiveautomation.ignition.common.expressions.parsing

Class SimpleExpressionParser

java.lang.Object

com.inductiveautomation.ignition.common.expressions.parsing.SimpleExpressionParser

All Implemented Interfaces:

Parser

public class SimpleExpressionParser
extends Object
implements Parser

Simple recursive descent parser for simple arithmetic expressions. Scannerless parsing. Generates an AST (using Expression instances) from the given input if part of language.

Constructor Summary

Constructors

Constructor	Description
SimpleExpressionParser(ArithmeticExpression.StringTypeAffinity affinity)

Method Summary

Modifier and Type	Method	Description
static boolean	containsMathematicalExpression(String value)	Returns true if the string contains any of the mathematical operators that would make this an expression according to this parser.
Expression	parse(String expr, ExpressionParseContext binder)	Parse the given string into an Expression.

Methods inherited from class java.lang.Object

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

Constructor Details

SimpleExpressionParser

public SimpleExpressionParser(ArithmeticExpression.StringTypeAffinity affinity)

Method Details

containsMathematicalExpression

public static boolean containsMathematicalExpression(String value)

Returns true if the string contains any of the mathematical operators that would make this an expression according to this parser.

parse

public Expression parse(String expr,
 ExpressionParseContext binder)

Description copied from interface: Parser

Parse the given string into an Expression.

Specified by:

parse in interface Parser

Parameters:

expr - the expression string to parse

binder - the ExpressionParseContext to use during parsing

Returns:

the parsed Expression