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* Prompt Template Processor
*
* Processes prompt templates with variable replacement supporting:
* - self.* variables (current file metadata and content)
* - field.* variables (form field values)
* - func.* functions (with pipe syntax)
*/
import fs from 'fs-extra';
import path from 'path';
import matter from 'gray-matter';
/**
* Self object - metadata and content of the current file (for page context)
*/
export interface PageSelfObject {
content: string;
file_path: string;
file_name: string;
file_base_name: string;
fields: Record<string, { content: unknown }>;
}
/**
* Self object for field context - represents the current field
*/
export interface FieldSelfObject {
content: string;
key: string;
type: string;
}
/**
* Parent page object - represents the parent page in field context
*/
export interface ParentPageObject {
content: string;
file_path: string;
file_name: string;
file_base_name: string;
fields: Record<string, { content: unknown }>;
}
/**
* Legacy self object for backward compatibility
*/
export interface SelfObject {
content: string;
file_path: string;
file_name: string;
file_base_name: string;
}
/**
* Field object - form field values from the prompt template
*/
export type FieldObject = Record<string, unknown>;
/**
* Context for page variable replacement
*/
export interface PageVariableContext {
self: PageSelfObject | null;
field: FieldObject;
workspacePath: string;
contextType: 'page';
}
/**
* Context for field variable replacement
*/
export interface FieldVariableContext {
self: FieldSelfObject | null;
parent_page: ParentPageObject | null;
field: FieldObject;
workspacePath: string;
contextType: 'field';
}
/**
* Union type for all variable contexts
*/
export type VariableContext = PageVariableContext | FieldVariableContext;
/**
* Parse frontmatter from content string
*/
function parseFrontmatter(content: string): {
data: Record<string, unknown>;
body: string;
} {
try {
const parsed = matter(content);
return {
data: parsed.data || {},
body: parsed.content || '',
};
} catch (error) {
console.error('Failed to parse frontmatter:', error);
return {
data: {},
body: content,
};
}
}
/**
* Convert frontmatter data to fields object
*/
function buildFieldsFromFrontmatter(
data: Record<string, unknown>
): Record<string, { content: unknown }> {
const fields: Record<string, { content: unknown }> = {};
for (const [key, value] of Object.entries(data)) {
fields[key] = { content: value };
}
return fields;
}
/**
* Build page self object from a file path (with parsed frontmatter fields)
*/
export async function buildPageSelfObject(
workspacePath: string,
filePath: string
): Promise<PageSelfObject> {
const absolutePath = path.isAbsolute(filePath)
? filePath
: path.join(workspacePath, filePath);
// Read file content
let content = '';
try {
content = await fs.readFile(absolutePath, 'utf-8');
} catch (error) {
console.error(`Failed to read file for page self object: ${absolutePath}`, error);
content = `[Could not read file: ${filePath}]`;
}
// Parse frontmatter
const { data } = parseFrontmatter(content);
const fields = buildFieldsFromFrontmatter(data);
// Extract file path relative to workspace
const relativePath = path.relative(workspacePath, absolutePath);
// Extract file name
const fileName = path.basename(absolutePath);
// Extract base name (without extension)
const baseName = path.basename(absolutePath, path.extname(absolutePath));
return {
content,
file_path: relativePath,
file_name: fileName,
file_base_name: baseName,
fields,
};
}
/**
* Build field self object (represents the current field in field context)
*/
export function buildFieldSelfObject(
fieldKey: string,
fieldType: string,
fieldContent: string
): FieldSelfObject {
return {
content: fieldContent,
key: fieldKey,
type: fieldType,
};
}
/**
* Build parent page object (represents the parent page in field context)
*/
export async function buildParentPageObject(
workspacePath: string,
filePath: string
): Promise<ParentPageObject> {
const absolutePath = path.isAbsolute(filePath)
? filePath
: path.join(workspacePath, filePath);
// Read file content
let content = '';
try {
content = await fs.readFile(absolutePath, 'utf-8');
} catch (error) {
console.error(`Failed to read file for parent page object: ${absolutePath}`, error);
content = `[Could not read file: ${filePath}]`;
}
// Parse frontmatter
const { data } = parseFrontmatter(content);
const fields = buildFieldsFromFrontmatter(data);
// Extract file path relative to workspace
const relativePath = path.relative(workspacePath, absolutePath);
// Extract file name
const fileName = path.basename(absolutePath);
// Extract base name (without extension)
const baseName = path.basename(absolutePath, path.extname(absolutePath));
return {
content,
file_path: relativePath,
file_name: fileName,
file_base_name: baseName,
fields,
};
}
/**
* Build self object from a file path (legacy - for backward compatibility)
*/
export async function buildSelfObject(
workspacePath: string,
filePath: string
): Promise<SelfObject> {
const absolutePath = path.isAbsolute(filePath)
? filePath
: path.join(workspacePath, filePath);
// Read file content
let content = '';
try {
content = await fs.readFile(absolutePath, 'utf-8');
} catch (error) {
console.error(`Failed to read file for self object: ${absolutePath}`, error);
content = `[Could not read file: ${filePath}]`;
}
// Extract file path relative to workspace
const relativePath = path.relative(workspacePath, absolutePath);
// Extract file name
const fileName = path.basename(absolutePath);
// Extract base name (without extension)
const baseName = path.basename(absolutePath, path.extname(absolutePath));
return {
content,
file_path: relativePath,
file_name: fileName,
file_base_name: baseName,
};
}
/**
* Read a file relative to workspace root
*/
async function funcReadFile(
filePath: string,
workspacePath: string
): Promise<string> {
const absolutePath = path.isAbsolute(filePath)
? filePath
: path.join(workspacePath, filePath);
try {
return await fs.readFile(absolutePath, 'utf-8');
} catch {
return `Could not read: ${filePath}`;
}
}
/**
* Convert string to uppercase
*/
function funcToUpper(input: string): string {
return String(input).toUpperCase();
}
/**
* Resolve a nested property path in an object
* Supports paths like "fields.title.content" or "fields[key].content"
*/
function resolveNestedPath(obj: unknown, path: string): unknown {
Iif (!obj || typeof obj !== 'object') {
return undefined;
}
const parts = path.split('.');
let current: unknown = obj;
for (const part of parts) {
if (!current || typeof current !== 'object') {
return undefined;
}
// Handle array-like access with brackets (e.g., "fields[key]")
const bracketMatch = part.match(/^(\w+)\[([^\]]+)\]$/);
Iif (bracketMatch) {
const objKey = bracketMatch[1];
const nestedKey = bracketMatch[2];
current = (current as Record<string, unknown>)[objKey];
if (current && typeof current === 'object') {
current = (current as Record<string, unknown>)[nestedKey];
} else {
return undefined;
}
} else {
current = (current as Record<string, unknown>)[part];
}
}
return current;
}
/**
* Resolve a variable expression to its value
*/
function resolveVariable(
expression: string,
context: VariableContext
): string | unknown {
const trimmed = expression.trim();
// Split by first dot to get object and property path
const firstDotIndex = trimmed.indexOf('.');
Iif (firstDotIndex === -1) {
return undefined;
}
const objectName = trimmed.substring(0, firstDotIndex);
const propertyPath = trimmed.substring(firstDotIndex + 1);
// Handle page context
if (context.contextType === 'page') {
if (objectName === 'self') {
Iif (!context.self) {
return '';
}
// Check for simple properties
if (propertyPath in context.self) {
return context.self[propertyPath as keyof PageSelfObject];
}
// Check for nested paths (e.g., "fields.title.content")
return resolveNestedPath(context.self, propertyPath);
E} else if (objectName === 'field') {
return resolveNestedPath(context.field, propertyPath);
}
}
// Handle field context
Eif (context.contextType === 'field') {
if (objectName === 'self') {
Iif (!context.self) {
return '';
}
// Simple field properties
Eif (propertyPath in context.self) {
return context.self[propertyPath as keyof FieldSelfObject];
}
return '';
} else if (objectName === 'parent_page') {
if (!context.parent_page) {
return '';
}
// Check for simple properties
if (propertyPath in context.parent_page) {
return context.parent_page[propertyPath as keyof ParentPageObject];
}
// Check for nested paths (e.g., "fields.title.content")
return resolveNestedPath(context.parent_page, propertyPath);
E} else if (objectName === 'field') {
return resolveNestedPath(context.field, propertyPath);
}
}
return undefined;
}
function isKeyOfSelfObject(value: unknown, context: VariableContext): value is keyof SelfObject {
// This function is now less useful with our new context types, but kept for potential legacy use
return typeof value === 'string';
}
/**
* Apply a function to a value
*/
async function applyFunction(
value: unknown,
funcExpression: string,
context: VariableContext
): Promise<unknown> {
const trimmed = funcExpression.trim();
// Parse function name (e.g., "func.readFile")
if (!trimmed.startsWith('func.')) {
throw new Error(`Invalid function expression: ${funcExpression}`);
}
const funcName = trimmed.substring(5); // Remove "func."
// Convert value to string for function processing
const stringValue = String(value || '');
// Apply function
switch (funcName) {
case 'readFile':
return await funcReadFile(stringValue, context.workspacePath);
case 'toUpper':
return funcToUpper(stringValue);
default:
throw new Error(`Unknown function: ${funcName}`);
}
}
/**
* Process a single variable expression (may include pipes)
*/
async function processExpression(
expression: string,
context: VariableContext
): Promise<string> {
const trimmed = expression.trim();
// Check if expression contains pipe
Iif (trimmed.includes('|')) {
const parts = trimmed.split('|').map(p => p.trim());
const variableExpr = parts[0];
const functionExprs = parts.slice(1);
// Resolve the variable first
let value = resolveVariable(variableExpr, context);
// Apply each function in the chain
for (const funcExpr of functionExprs) {
value = await applyFunction(value, funcExpr, context);
}
return String(value || '');
} else {
// No pipe, just resolve variable
const value = resolveVariable(trimmed, context);
return String(value ?? '');
}
}
/**
* Process a prompt template and replace all variables
*/
export async function processPromptTemplate(
templateText: string,
context: VariableContext
): Promise<string> {
// Find all {{ ... }} patterns
const variablePattern = /\{\{([^}]+)\}\}/g;
let result = templateText;
const matches = Array.from(templateText.matchAll(variablePattern));
// Process each match (in reverse to maintain string positions)
for (let i = matches.length - 1; i >= 0; i--) {
const match = matches[i];
const fullMatch = match[0];
const expression = match[1];
const startIndex = match.index!;
try {
// Process the expression
const replacement = await processExpression(expression, context);
// Replace in result string
result = result.substring(0, startIndex) +
replacement +
result.substring(startIndex + fullMatch.length);
} catch (error) {
console.error(`Error processing variable expression: ${expression}`, error);
// Leave the variable as-is on error
}
}
return result;
}
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