qwc2-lts/utils/expr_grammar/test.js

QGIS Web Client

/* This is just a scratch file for testing the expression grammar */

var nearley = require("nearley");
var grammar = require("./grammar.js");
global.qwc2ExpressionParserContext = {
  feature: {
    "type": "Feature",
    "properties": {
      "listnr": 1,
      "grpcode": 2,
      "numcode": 3
    }
  },
  getFeature: function getFeature(layerName, attr, value) {
    return {
      "type": "Feature",
      "id": 210000,
      "geometry": null,
      "properties": {
        "id": 2,
        "label": "ABLAGERUNGEN",
        "code": "DBC",
        "listnr": 21,
        "grpcode": 0,
        "numcode": 0,
        "q1": null,
        "q1suff": null,
        "q2": null,
        "q2suff": null,
        "qsr": null,
        "z1": null,
        "z2": null,
        "l1": 2,
        "l2": null,
        "lastlevel": null,
        "level": 1,
        "tooltip": "Ablagerungen an der Schachtsohle oder an Auftritten.",
        "id2": 210000
      },
      "__version__": 1711648978811
    };
  },
  asFilter: false
};

// Create a Parser object from our grammar.
var parser = new nearley.Parser(nearley.Grammar.fromCompiled(grammar));

// Parse something!
// parser.feed("attribute('txt') is not null and attribute('txt') <> ''")
// parser.feed("attribute(get_feature('foo', 'asd', 3), 'asd')");
// parser.feed("attribute('listnr') is not null and attribute(get_feature('chnnodedam_map','id2',attribute('listnr')*10000),'lastlevel')is null")
// parser.feed("attribute(get_feature('chnnodedam_map','id2',(coalesce(attribute('listnr')*10000,0) + coalesce(attribute('grpcode')*100,0) + coalesce(attribute('numcode'),0))),'l1')")
// parser.feed('"listnrx"')
// parser.feed('"listnr"*10000 + "grpcode"*100 + "numcode"')
// parser.feed('"listnr" = 1 AND ("grpcode" = 2 OR "numcode" = 3)')
// parser.feed('"listnr" =current_value(\'listnr\') and  "grpcode" >0 and "numcode" = 0')
// parser.feed(' "listnr" =current_value(\'listnr\') and "grpcode" =  current_value(\'grpcode\') and "numcode" >0 and "foo" = ((1<2) = true)')
// parser.feed("if(3>2, 3, 4)")
parser.feed("nullif('a', 'b')");
console.log(JSON.stringify(parser.results));