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outputParser.ts
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outputParser.ts
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import { BaseOutputParser } from "@langchain/core/output_parsers";
import { Plan } from "./base.js";
import { PLANNER_SYSTEM_PROMPT_MESSAGE_TEMPLATE } from "./prompt.js";
/**
* Specific implementation of the `BaseOutputParser` class designed to
* parse the output text into a `Plan` object.
*/
export class PlanOutputParser extends BaseOutputParser<Plan> {
lc_namespace = ["langchain", "experimental", "plan_and_execute"];
/**
* Parses the output text into a `Plan` object. The steps are extracted by
* splitting the text on newline followed by a number and a period,
* indicating the start of a new step. The `<END_OF_PLAN>` tag is then
* removed from each step.
* @param text The output text to be parsed.
* @returns A `Plan` object consisting of a series of steps.
*/
async parse(text: string): Promise<Plan> {
return {
steps: text
.split(/\n\d+\.\s?/)
.slice(1)
.map((step) => ({ text: step.replace(`<END_OF_PLAN>`, "") })),
};
}
/**
* Returns a string that represents the format instructions for the plan.
* This is defined by the `PLANNER_SYSTEM_PROMPT_MESSAGE_TEMPLATE`
* constant.
* @returns A string representing the format instructions for the plan.
*/
getFormatInstructions(): string {
return PLANNER_SYSTEM_PROMPT_MESSAGE_TEMPLATE;
}
}