How to use the vega-expression.ASTNode 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 / packages / vega-parser / src / parsers / expression / codegen-params.js View on Github 
if (args[0].type === Literal) { // scale dependency
name = args[0].value;
var scaleName = scalePrefix + name;
if (!params.hasOwnProperty(scaleName)) {
try {
params[scaleName] = scope.scaleRef(name);
} catch (err) {
// TODO: error handling? warning?
}
}
}
else if (args[0].type === Identifier) { // forward reference to signal
name = args[0].name;
args[0] = new ASTNode(Literal);
args[0].raw = '{signal:"' + name + '"}';
}
}if (args[0].type === Literal) { // scale dependency
name = args[0].value;
var scaleName = scalePrefix + name;
if (!params.hasOwnProperty(scaleName)) {
try {
params[scaleName] = scope.scaleRef(name);
} catch (err) {
// TODO: error handling? warning?
}
}
}
else if (args[0].type === Identifier) { // forward reference to signal
name = args[0].name;
args[0] = new ASTNode(Literal);
args[0].raw = '{signal:"' + name + '"}';
}
}vega-expression
Vega expression parser and code generator.
