Added initial metric functions directives based on graphite query

editor.

plugins/datasource-zabbix/metricFunctions.js

@@ -0,0 +1,189 @@
+define([
+  'lodash',
+  'jquery'
+],
+function (_, $) {
+  'use strict';
+
+  var index = [];
+  var categories = {
+    Transform: [],
+    Aggregate: [],
+    Alias: []
+  };
+
+  function addFuncDef(funcDef) {
+    funcDef.params = funcDef.params || [];
+    funcDef.defaultParams = funcDef.defaultParams || [];
+
+    if (funcDef.category) {
+      funcDef.category.push(funcDef);
+    }
+    index[funcDef.name] = funcDef;
+    index[funcDef.shortName || funcDef.name] = funcDef;
+  }
+
+  var optionalSeriesRefArgs = [
+    { name: 'other', type: 'value_or_series', optional: true },
+    { name: 'other', type: 'value_or_series', optional: true },
+    { name: 'other', type: 'value_or_series', optional: true },
+    { name: 'other', type: 'value_or_series', optional: true },
+    { name: 'other', type: 'value_or_series', optional: true }
+  ];
+
+  addFuncDef({
+    name: 'scaleToSeconds',
+    category: categories.Transform,
+    params: [{ name: 'seconds', type: 'int' }],
+    defaultParams: [1],
+  });
+
+  addFuncDef({
+    name: 'groupBy',
+    category: categories.Transform,
+    params: [
+      { name: 'interval', type: 'string'},
+      { name: 'function', type: 'string', options: ['avg', 'min', 'max'] }
+    ],
+    defaultParams: ['1m', 'avg'],
+  });
+
+  addFuncDef({
+    name: 'perSecond',
+    category: categories.Transform,
+    params: [{ name: "max value", type: "int", optional: true }],
+    defaultParams: [],
+  });
+
+  addFuncDef({
+    name: 'aggregate',
+    category: categories.Aggregate,
+    params: [
+      { name: 'function', type: 'string', options: ['sum', 'avg', 'min', 'max'] }
+    ],
+    defaultParams: ['sum'],
+  });
+
+  addFuncDef({
+    name: "holtWintersConfidenceBands",
+    category: categories.Aggregate,
+    params: [{ name: "delta", type: 'int' }],
+    defaultParams: [3]
+  });
+
+  addFuncDef({
+    name: 'alias',
+    category: categories.Alias,
+    params: [
+      { name: 'alias', type: 'string'}
+    ],
+    defaultParams: [],
+  });
+
+  addFuncDef({
+    name: 'averageSeries',
+    shortName: 'avg',
+    category: categories.Alias,
+    params: optionalSeriesRefArgs,
+    defaultParams: [''],
+  });
+
+  _.each(categories, function(funcList, catName) {
+    categories[catName] = _.sortBy(funcList, 'name');
+  });
+
+  function FuncInstance(funcDef, options) {
+    this.def = funcDef;
+    this.params = [];
+
+    if (options && options.withDefaultParams) {
+      this.params = funcDef.defaultParams.slice(0);
+    }
+
+    this.updateText();
+  }
+
+  FuncInstance.prototype.render = function(metricExp) {
+    var str = this.def.name + '(';
+    var parameters = _.map(this.params, function(value, index) {
+
+      var paramType = this.def.params[index].type;
+      if (paramType === 'int' || paramType === 'value_or_series' || paramType === 'boolean') {
+        return value;
+      }
+      else if (paramType === 'int_or_interval' && $.isNumeric(value)) {
+        return value;
+      }
+
+      return "'" + value + "'";
+
+    }, this);
+
+    if (metricExp) {
+      parameters.unshift(metricExp);
+    }
+
+    return str + parameters.join(', ') + ')';
+  };
+
+  FuncInstance.prototype._hasMultipleParamsInString = function(strValue, index) {
+    if (strValue.indexOf(',') === -1) {
+      return false;
+    }
+
+    return this.def.params[index + 1] && this.def.params[index + 1].optional;
+  };
+
+  FuncInstance.prototype.updateParam = function(strValue, index) {
+    // handle optional parameters
+    // if string contains ',' and next param is optional, split and update both
+    if (this._hasMultipleParamsInString(strValue, index)) {
+      _.each(strValue.split(','), function(partVal, idx) {
+        this.updateParam(partVal.trim(), idx);
+      }, this);
+      return;
+    }
+
+    if (strValue === '' && this.def.params[index].optional) {
+      this.params.splice(index, 1);
+    }
+    else {
+      this.params[index] = strValue;
+    }
+
+    this.updateText();
+  };
+
+  FuncInstance.prototype.updateText = function () {
+    if (this.params.length === 0) {
+      this.text = this.def.name + '()';
+      return;
+    }
+
+    var text = this.def.name + '(';
+    text += this.params.join(', ');
+    text += ')';
+    this.text = text;
+  };
+
+  return {
+    createFuncInstance: function(funcDef, options) {
+      if (_.isString(funcDef)) {
+        if (!index[funcDef]) {
+          throw { message: 'Method not found ' + name };
+        }
+        funcDef = index[funcDef];
+      }
+      return new FuncInstance(funcDef, options);
+    },
+
+    getFuncDef: function(name) {
+      return index[name];
+    },
+
+    getCategories: function() {
+      return categories;
+    }
+  };
+
+});