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/**
* @license
* Copyright 2025 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
/**
* Represents a single detected injection site in a prompt string.
*/
export interface Injection {
/** The content extracted from within the braces (e.g., the command or path), trimmed. */
content: string;
/** The starting index of the injection (inclusive, points to the start of the trigger). */
startIndex: number;
/** The ending index of the injection (exclusive, points after the closing '}'). */
endIndex: number;
}
/**
* Iteratively parses a prompt string to extract injections (e.g., !{...} or @{...}),
* correctly handling nested braces within the content.
*
* This parser relies on simple brace counting and does not support escaping.
*
* @param prompt The prompt string to parse.
* @param trigger The opening trigger sequence (e.g., '!{', '@{').
* @param contextName Optional context name (e.g., command name) for error messages.
* @returns An array of extracted Injection objects.
* @throws Error if an unclosed injection is found.
*/
export function extractInjections(
prompt: string,
trigger: string,
contextName?: string,
): Injection[] {
const injections: Injection[] = [];
let index = 0;
while (index < prompt.length) {
const startIndex = prompt.indexOf(trigger, index);
if (startIndex === -1) {
break;
}
let currentIndex = startIndex + trigger.length;
let braceCount = 1;
let foundEnd = false;
while (currentIndex < prompt.length) {
const char = prompt[currentIndex];
if (char === '{') {
braceCount++;
} else if (char === '}') {
braceCount--;
if (braceCount === 0) {
const injectionContent = prompt.substring(
startIndex + trigger.length,
currentIndex,
);
const endIndex = currentIndex + 1;
injections.push({
content: injectionContent.trim(),
startIndex,
endIndex,
});
index = endIndex;
foundEnd = true;
break;
}
}
currentIndex++;
}
// Check if the inner loop finished without finding the closing brace.
if (!foundEnd) {
const contextInfo = contextName ? ` in command '${contextName}'` : '';
// Enforce strict parsing (Comment 1) and clarify limitations (Comment 2).
throw new Error(
`Invalid syntax${contextInfo}: Unclosed injection starting at index ${startIndex} ('${trigger}'). Ensure braces are balanced. Paths or commands with unbalanced braces are not supported directly.`,
);
}
}
return injections;
}
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