Class JavascriptCompiler

An expression compiler for javascript expressions.

Inheritance

System.Object

JavascriptCompiler

Namespace: Lucene.Net.Expressions.JS

Assembly: Lucene.Net.Expressions.dll

Syntax

public class JavascriptCompiler : object

Remarks

An expression compiler for javascript expressions.

Example:

Expression foo = JavascriptCompiler.Compile("((0.3*popularity)/10.0)+(0.7*score)");

See the Lucene.Net.Expressions.JS for the supported syntax and default functions.

You can compile with an alternate set of functions via Compile(String, IDictionary<String, MethodInfo>). For example:

IDictionary<string, MethodInfo> functions = new Dictionary<string, MethodInfo>();
// add all the default functions
functions.PutAll(JavascriptCompiler.DEFAULT_FUNCTIONS);
// add sqrt()
functions.Put("sqrt", (typeof(Math)).GetMethod("Sqrt", new Type[] { typeof(double) }));
// call compile with customized function map
Expression foo = JavascriptCompiler.Compile("sqrt(score)+ln(popularity)", functions);

This is a Lucene.NET EXPERIMENTAL API, use at your own risk

Fields

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DEFAULT_FUNCTIONS

The default set of functions available to expressions.

Declaration

public static readonly IDictionary<string, MethodInfo> DEFAULT_FUNCTIONS

Field Value

Type	Description
IDictionary<System.String, MethodInfo>

Remarks

The default set of functions available to expressions.

See the Lucene.Net.Expressions.JS for a list.

Methods

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Compile(String)

Compiles the given expression.

Declaration

public static Expression Compile(string sourceText)

Parameters

Type	Name	Description
System.String	sourceText	The expression to compile

Returns

Type	Description
Expression	A new compiled expression

Exceptions

Type	Condition
ParseException	on failure to compile

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Compile(String, IDictionary<String, MethodInfo>)

Compiles the given expression with the supplied custom functions.

Declaration

public static Expression Compile(string sourceText, IDictionary<string, MethodInfo> functions)

Parameters

Type	Name	Description
System.String	sourceText	The expression to compile
IDictionary<System.String, MethodInfo>	functions	map of names to functions

Returns

Type	Description
Expression	A new compiled expression

Remarks

Compiles the given expression with the supplied custom functions.

Functions must be public static, return and can take from zero to 256 parameters.

Exceptions

Type	Condition
ParseException	on failure to compile