water.cascade

Class Exec

java.lang.Object

water.Iced

water.cascade.Exec

All Implemented Interfaces:

java.lang.Cloneable, Freezable

public class Exec
extends Iced

An interpreter. Parse an AST and then execute the AST by walking it. Parsing: Trees are defined in the following way: '(' begins a tree node ')' ends a tree node '#' signals the parser to parse a double '_s_' signals the parser to parse a string '$' signals a named column selection '[' signals a column slice by index -> R shalt replace column names with their indexes! '_a_' signals the parser to assign the RHS to the LHS. '_f_' signals the parser to a parse a UDF.

Constructor Summary

Constructors

Constructor and Description
Exec(java.lang.String ast)

Method Summary

Methods

Modifier and Type	Method and Description
protected AST	parse()

Methods inherited from class water.Iced

clone, frozenType, read_impl, read, readJSON_impl, readJSON, write_impl, write, writeHTML_impl, writeHTML, writeJSON_impl, writeJSON

Methods inherited from class java.lang.Object

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

Constructor Detail

Exec

public Exec(java.lang.String ast)

Method Detail

parse

protected AST parse()