Function extract_json_frontmatter

pub fn extract_json_frontmatter(content: &str) -> Result<&str, Error>

Extracts JSON frontmatter from the content by detecting balanced curly braces ({}).

This function attempts to locate a valid JSON object starting with { and checks for balanced curly braces to identify the end of the frontmatter. If the JSON object is found, it returns the frontmatter as a string slice. A maximum nesting depth is enforced to prevent deeply nested JSON from causing stack overflow.

Arguments

• content - The full content string that may contain JSON frontmatter.

Returns

A Result containing the extracted JSON frontmatter string slice. If no valid JSON frontmatter is detected, it returns an Error.

Errors

• Error::InvalidJson: If the content does not start with { or contains unbalanced braces.
• Error::JsonDepthLimitExceeded: If the JSON object exceeds the allowed nesting depth.

Example

use frontmatter_gen::extractor::extract_json_frontmatter;
let content = "{ \"title\": \"Example\" }\nContent";
let frontmatter = extract_json_frontmatter(content).unwrap();
assert_eq!(frontmatter, "{ \"title\": \"Example\" }");