'use strict';
function evalStringConcat(ast ) /* : string */ {
switch (ast.type) {
case 'StringLiteral':
case 'Literal':
return ast.value;
case 'BinaryExpression':
if (ast.operator !== '+') {
throw new Error('Unsupported binary operator ' + ast.operator);
}
return evalStringConcat(ast.left) + evalStringConcat(ast.right);
default:
throw new Error('Unsupported type ' + ast.type);
}
}
exports.evalStringConcat = evalStringConcat;
function evalStringAndTemplateConcat(
ast ,
args
) /* : string */ {
switch (ast.type) {
case 'StringLiteral':
return ast.value;
case 'BinaryExpression':
if (ast.operator !== '+') {
throw new Error('Unsupported binary operator ' + ast.operator);
}
return (
evalStringAndTemplateConcat(ast.left, args) +
evalStringAndTemplateConcat(ast.right, args)
);
case 'TemplateLiteral': {
let elements = [];
for (let i = 0; i < ast.quasis.length; i++) {
const elementNode = ast.quasis[i];
if (elementNode.type !== 'TemplateElement') {
throw new Error('Unsupported type ' + ast.type);
}
elements.push(elementNode.value.cooked);
}
args.push(...ast.expressions);
return elements.join('%s');
}
default:
args.push(ast);
return '%s';
}
}
exports.evalStringAndTemplateConcat = evalStringAndTemplateConcat;