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index.ts
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index.ts
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import { Node, Program } from "./types/ast";
import { ContentRenderer } from "./renderer/ContentRenderer";
import { MustacheRenderer } from "./renderer/MustacheRenderer";
import { ProgramRenderer } from "./renderer/ProgramRenderer";
import { HelperFn } from "./types/helper";
import { NodeMapping, RenderContext } from "./types/nodeMapping";
import { PathEvaluator } from "./expressions/PathEvaluator";
import { LiteralEvaluator } from "./expressions/LiteralEvaluator";
import { SubExpressionEvaluator } from "./expressions/SubExpressionEvaluator";
type Runnable = (input: Record<string, unknown>) => string;
export class HandlebarsNgRunner {
helpers: Map<string, HelperFn> = new Map();
compile(ast: Program): Runnable {
const renderer = nodeMapping.createRenderer(ast);
return (input) => {
const context: RenderContext = {
input,
output: "",
helpers: this.helpers,
};
renderer.render(context);
return context.output;
};
}
registerHelper(name: string, fn: HelperFn) {
this.helpers.set(name, fn);
}
}
const nodeMapping: NodeMapping = {
createEvaluator(node) {
switch (node.type) {
case "PathExpression":
return new PathEvaluator(node);
case "StringLiteral":
case "NumberLiteral":
case "BooleanLiteral":
return new LiteralEvaluator(node);
case "SubExpression":
return new SubExpressionEvaluator(node, nodeMapping);
default:
unexpectedNodeType(node);
}
},
createRenderer(node) {
switch (node.type) {
case "ContentStatement":
return new ContentRenderer(node);
case "MustacheStatement":
return new MustacheRenderer(node, this);
case "Program":
return new ProgramRenderer(node, this);
case "CommentStatement":
throw new Error("Not yet implemented");
default:
unexpectedNodeType(node);
}
},
};
function unexpectedNodeType(node: never): never {
throw new Error("Unexpected node type" + (node as Node).type);
}