Class Expression

java.lang.Object

com.hypixel.hytale.server.npc.util.expression.Expression

public class Expression
extends Object

Simple JavaScript-style expression evaluation.

Supports strong type checking (currently Numbers, Boolean and Strings). Supports compilation to list/arrays of instructions (which are Consumer like objects) executed on a stack machine. Supports scopes/symbol tables with functions and variables. Symbols can be resolved to Suppliers when compiling so that further lookup into symbol table can be avoided (improving performance when expression is always executed within te same object context).

Constructor Summary

Constructors

Constructor	Description
Expression()

Method Summary

Modifier and Type	Method	Description
ValueType	compile(String expression, Scope compileScope, List<ExecutionContext.Instruction> instructions)
ValueType	compile(String expression, Scope scope, List<ExecutionContext.Instruction> instructions, boolean fullResolve)
static ValueType	compileStatic(String expression, Scope scope, List<ExecutionContext.Instruction> instructions)
ExecutionContext	evaluate(String expression, Scope scope)
ExecutionContext	execute(ExecutionContext.Instruction[] instructions, Scope scope)
ExecutionContext	execute(List<ExecutionContext.Instruction> instructions, Scope scope)
static Lexer<Token>	getLexerInstance()

Methods inherited from class Object

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

Constructor Details

Expression

public Expression()

Method Details

compile

public ValueType compile(@Nonnull
 String expression,
 Scope scope,
 @Nonnull
 List<ExecutionContext.Instruction> instructions,
 boolean fullResolve)

compile

public ValueType compile(@Nonnull
 String expression,
 Scope compileScope,
 @Nonnull
 List<ExecutionContext.Instruction> instructions)

execute

@Nonnull
public ExecutionContext execute(@Nonnull
 List<ExecutionContext.Instruction> instructions,
 Scope scope)

execute

@Nonnull
public ExecutionContext execute(@Nonnull
 ExecutionContext.Instruction[] instructions,
 Scope scope)

evaluate

@Nonnull
public ExecutionContext evaluate(@Nonnull
 String expression,
 Scope scope)

compileStatic

public static ValueType compileStatic(@Nonnull
 String expression,
 Scope scope,
 @Nonnull
 List<ExecutionContext.Instruction> instructions)

getLexerInstance

@Nonnull
public static Lexer<Token> getLexerInstance()