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Contains the entire NEBA core implementation, i.e. the framework that interprets the NEBA API annotations and provides implementations for the service and lifecycle callback interfaces provided in the NEBA API. This package must not export anything as its implementation details are entirely private.

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/**
 * Copyright 2013 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 the "License";
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0

 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 **/

/**
 * This PEG (parsing expression grammar) is used to validate the filter expressions
 * in the model metadata console's filter input field. The parser errors
 * are used to generate context-specific autocompletion suggestions.
 **/
expr
  = whitespace+ expr whitespace* {return expr}
      / l:term1 f:op_3 r:expr {return l + f + r}
      / t:term1 {return t}
term1
   = l:term2 f:op_4 r:term1 {return l + f + r}
      / t:term2 {return t}
term2
   = l:term3 f:op_6 r:term2 {return l + f + r}
      / t:term3 {return t}
term3
   = l:term4 f:op_7 r:term3 {return l + f + r}
      / t:term4 {return t}
term4
   = l:term5 f:op_11 r:term4 {return l + f + r}
      / t:term5 {return t}
term5
   = l:primary f:op_12 r:term5 {return l + f + r}
      / p:primary {return p}

primary
   = whitespace+ p:primary whitespace* {return p}
      / "-" p:primary {return "-" + p}
      / number
      / boolean
      / numVar
      / "entire(" v:numVar ")" {return "entire." + v + "Sum"}
      / "average(" v:numVar ")" {return "entire." + v + "Avg"}
      / '(' e:expr ')' {return "(" + e + ")"}

boolean "a boolean"
   = "true"
     / "false"

number "a number"
   = "." r:integer {return "0." + r}
   / l:integer "." r:integer {return l + "." + r}
   / integer

integer
  = val: [0-9]+ {return val.join("")}

numVar
   = v:"mappings" {return "modelData." + v}
   / v:"mappableFields" {return "modelData." + v}
   / v:"lazyFields" {return "modelData." + v}
   / v:"greedyFields" {return "modelData." + v}
   / v:"instantiations" {return "modelData." + v}
   / v:"averageMappingDuration" {return "modelData." + v}
   / v:"maximumMappingDuration" {return "modelData." + v}
   / v:"minimumMappingDuration" {return "modelData." + v}
   / v:"mappingDurationMedian" {return "modelData." + v}
   / v:"totalMappingDuration" {return "modelData." + v}

op_3
   = whitespace+ f:op_3 whitespace* {return f}
     / "*" 
     / "/"

op_4
   = whitespace+ f:op_4 whitespace* {return f}
     / "+" 
     / "-" 

op_6
   = whitespace+ f:op_6 whitespace* {return f}
     / "<=" 
     / ">=" 
     / "<" 
     / ">"

op_7
   = whitespace+ f:op_7 whitespace* {return f}
     / "==" 
     / "!="

op_7_1
   = whitespace+ f:op_7_1 whitespace* {return f}
     / "~" 

op_11
   = whitespace+ f:op_11 whitespace* {return f}
      / "&&"

op_12
   = whitespace+ f:op_12 whitespace* {return f}
     / "||" 

whitespace ""
   = [ \t]+