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const { ZeroShotAgentOutputParser } = require('langchain/agents');
class CustomOutputParser extends ZeroShotAgentOutputParser {
constructor(fields) {
super(fields);
this.tools = fields.tools;
this.longestToolName = '';
for (const tool of this.tools) {
if (tool.name.length > this.longestToolName.length) {
this.longestToolName = tool.name;
}
}
this.finishToolNameRegex = /(?:the\s+)?final\s+answer:\s*/i;
this.actionValues =
/(?:Action(?: [1-9])?:) ([\s\S]*?)(?:\n(?:Action Input(?: [1-9])?:) ([\s\S]*?))?$/i;
this.actionInputRegex = /(?:Action Input(?: *\d*):) ?([\s\S]*?)$/i;
this.thoughtRegex = /(?:Thought(?: *\d*):) ?([\s\S]*?)$/i;
}
getValidTool(text) {
let result = false;
for (const tool of this.tools) {
const { name } = tool;
const toolIndex = text.indexOf(name);
if (toolIndex !== -1) {
result = name;
break;
}
}
return result;
}
checkIfValidTool(text) {
let isValidTool = false;
for (const tool of this.tools) {
const { name } = tool;
if (text === name) {
isValidTool = true;
break;
}
}
return isValidTool;
}
async parse(text) {
const finalMatch = text.match(this.finishToolNameRegex);
// if (text.includes(this.finishToolName)) {
// const parts = text.split(this.finishToolName);
// const output = parts[parts.length - 1].trim();
// return {
// returnValues: { output },
// log: text
// };
// }
if (finalMatch) {
const output = text.substring(finalMatch.index + finalMatch[0].length).trim();
return {
returnValues: { output },
log: text,
};
}
const match = this.actionValues.exec(text); // old v2
if (!match) {
console.log(
'\n\n<----------------------HIT NO MATCH PARSING ERROR---------------------->\n\n',
match,
);
const thoughts = text.replace(/[tT]hought:/, '').split('\n');
// return {
// tool: 'self-reflection',
// toolInput: thoughts[0],
// log: thoughts.slice(1).join('\n')
// };
return {
returnValues: { output: thoughts[0] },
log: thoughts.slice(1).join('\n'),
};
}
let selectedTool = match?.[1].trim().toLowerCase();
if (match && selectedTool === 'n/a') {
console.log(
'\n\n<----------------------HIT N/A PARSING ERROR---------------------->\n\n',
match,
);
return {
tool: 'self-reflection',
toolInput: match[2]?.trim().replace(/^"+|"+$/g, '') ?? '',
log: text,
};
}
let toolIsValid = this.checkIfValidTool(selectedTool);
if (match && !toolIsValid) {
console.log(
'\n\n<----------------Tool invalid: Re-assigning Selected Tool---------------->\n\n',
match,
);
selectedTool = this.getValidTool(selectedTool);
}
if (match && !selectedTool) {
console.log(
'\n\n<----------------------HIT INVALID TOOL PARSING ERROR---------------------->\n\n',
match,
);
selectedTool = 'self-reflection';
}
if (match && !match[2]) {
console.log(
'\n\n<----------------------HIT NO ACTION INPUT PARSING ERROR---------------------->\n\n',
match,
);
// In case there is no action input, let's double-check if there is an action input in 'text' variable
const actionInputMatch = this.actionInputRegex.exec(text);
const thoughtMatch = this.thoughtRegex.exec(text);
if (actionInputMatch) {
return {
tool: selectedTool,
toolInput: actionInputMatch[1].trim(),
log: text,
};
}
if (thoughtMatch && !actionInputMatch) {
return {
tool: selectedTool,
toolInput: thoughtMatch[1].trim(),
log: text,
};
}
}
if (match && selectedTool.length > this.longestToolName.length) {
console.log('\n\n<----------------------HIT LONG PARSING ERROR---------------------->\n\n');
let action, input, thought;
let firstIndex = Infinity;
for (const tool of this.tools) {
const { name } = tool;
const toolIndex = text.indexOf(name);
if (toolIndex !== -1 && toolIndex < firstIndex) {
firstIndex = toolIndex;
action = name;
}
}
// In case there is no action input, let's double-check if there is an action input in 'text' variable
const actionInputMatch = this.actionInputRegex.exec(text);
if (action && actionInputMatch) {
console.log(
'\n\n<------Matched Action Input in Long Parsing Error------>\n\n',
actionInputMatch,
);
return {
tool: action,
toolInput: actionInputMatch[1].trim().replaceAll('"', ''),
log: text,
};
}
if (action) {
const actionEndIndex = text.indexOf('Action:', firstIndex + action.length);
const inputText = text
.slice(firstIndex + action.length, actionEndIndex !== -1 ? actionEndIndex : undefined)
.trim();
const inputLines = inputText.split('\n');
input = inputLines[0];
if (inputLines.length > 1) {
thought = inputLines.slice(1).join('\n');
}
const returnValues = {
tool: action,
toolInput: input,
log: thought || inputText,
};
const inputMatch = this.actionValues.exec(returnValues.log); //new
if (inputMatch) {
console.log('inputMatch');
console.dir(inputMatch, { depth: null });
returnValues.toolInput = inputMatch[1].replaceAll('"', '').trim();
returnValues.log = returnValues.log.replace(this.actionValues, '');
}
return returnValues;
} else {
console.log('No valid tool mentioned.', this.tools, text);
return {
tool: 'self-reflection',
toolInput: 'Hypothetical actions: \n"' + text + '"\n',
log: 'Thought: I need to look at my hypothetical actions and try one',
};
}
// if (action && input) {
// console.log('Action:', action);
// console.log('Input:', input);
// }
}
return {
tool: selectedTool,
toolInput: match[2]?.trim()?.replace(/^"+|"+$/g, '') ?? '',
log: text,
};
}
}
module.exports = { CustomOutputParser };
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