How to use the vega-expression.compiler function in vega-expression
To help you get started, we’ve selected a few vega-expression examples, based on popular ways it is used in public projects.
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vega / vega / src / parse / expr.js View on Github 
var dl = require('datalib'),
template = dl.template,
expr = require('vega-expression'),
args = ['datum', 'parent', 'event', 'signals'];
var compile = expr.compiler(args, {
idWhiteList: args,
fieldVar: args[0],
globalVar: function(id) {
return 'this.sig[' + dl.str(id) + ']._value';
},
functions: function(codegen) {
var fn = expr.functions(codegen);
fn.eventItem = 'event.vg.getItem';
fn.eventGroup = 'event.vg.getGroup';
fn.eventX = 'event.vg.getX';
fn.eventY = 'event.vg.getY';
fn.open = 'window.open';
fn.scale = scaleGen(codegen, false);
fn.iscale = scaleGen(codegen, true);
fn.inrange = 'this.defs.inrange';
fn.indata = indataGen(codegen);vega-expression
Vega expression parser and code generator.
