resolve_folded_urls: Resolve URLs through composed redirects and canonicals

In pagerankr: Modular Toolkit for PageRank Calculation

Resolve URLs through composed redirects and canonicals

Description

Resolves URL vectors with the same composed 3xx redirect plus declared 'rel=canonical' fold-map engine used by [pagerank()] and [build_fold_map()]. This helper performs signal folding only; it does not perform URL syntax canonicalization.

Usage

resolve_folded_urls(
  urls,
  redirects_df = NULL,
  canonicals_df = NULL,
  redirect_from_col = "from",
  redirect_to_col = "to",
  canonical_from_col = "from",
  canonical_to_col = "to",
  duplicate_from_policy = c("strict", "first_wins", "last_wins", "most_frequent",
    "prune_source", "resolve_if_consistent"),
  loop_handling = c("error", "prune_loop", "break_arrow"),
  canonical_duplicate_from_policy = c("strict", "first_wins", "last_wins",
    "most_frequent", "prune_source", "resolve_if_consistent"),
  canonical_loop_handling = c("error", "prune_loop", "break_arrow"),
  canonical_conflict_policy = c("redirect_wins", "error", "canonical_wins")
)

Arguments

urls	Character vector of URLs to resolve.
redirects_df	Optional data frame of redirect rules, or 'NULL'.
canonicals_df	Optional data frame of declared canonical links, or 'NULL'.
redirect_from_col, redirect_to_col	From/to columns in 'redirects_df'. Default '"from"' / '"to"'.
canonical_from_col, canonical_to_col	From/to columns in 'canonicals_df'. Default '"from"' / '"to"'.
duplicate_from_policy	How to handle a redirect source with multiple distinct targets. See [resolve_redirects()]. Default '"strict"'.
loop_handling	How to handle redirect cycles. See [resolve_redirects()]. Default '"error"'. Also governs cross-signal cycles in the composed graph.
canonical_duplicate_from_policy	How to handle a canonical source with multiple distinct declared canonicals. Reuses the 'duplicate_from_policy' enum. Default '"strict"'.
canonical_loop_handling	How to handle cycles among declared canonicals. Reuses the 'loop_handling' enum. Default '"error"'.
canonical_conflict_policy	How to resolve a redirect-vs-canonical disagreement on the **same source** URL. One of: '"redirect_wins"' (Default) The 3xx redirect wins; a canonical declared on a URL that itself redirects is ignored and flagged, never transferred onto the redirect target. '"error"' Error when a redirect and a canonical disagree on the same source (after audit context is computed). Sources where the two signals agree do not error. '"canonical_wins"' The declared canonical wins for that source; still flagged in the audit. The explicit exception to the default ignored-canonical-on-redirecting-source rule.

Value

A data frame with 'original', 'resolved', 'changed', and 'signal' columns. The exported fold map is attached as attribute '"fold_map"' and cross-signal audit tables are attached as '"conflicts"' and '"ignored_canonicals"'.

See Also

Other URL-vector resolvers: resolve_canonical_urls(), resolve_redirect_urls()

Examples

redirects <- data.frame(from = "B", to = "C")
canonicals <- data.frame(from = "A", to = "B")
resolve_folded_urls(c("A", "B", "X"), redirects, canonicals)

pagerankr documentation built on Oct. 1, 2026, 5:09 p.m.