feat(pdftract-4t0jk): implement page_type_string mapping table
Implement the page_type_string(class, ocr_succeeded, has_text, has_images) function that maps PageClass to canonical page_type strings for the 6.1 JSON schema per INV-9 stable taxonomy. Mapping table: - Vector → "text" - Scanned → "scanned" - Hybrid → "mixed" - BrokenVector + ocr_succeeded=false → "broken_vector" - BrokenVector + ocr_succeeded=true → "scanned" (post-OCR recovery) - Override: !has_text && !has_images → "blank" - Override: !has_text && has_images → "figure_only" Add comprehensive unit tests covering all 32 combinations (4 classes × 2 ocr_succeeded × 2 has_text × 2 has_images). Closes: pdftract-4t0jk
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jedarden
parent
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2 changed files with 316 additions and 1 deletions
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@ -493,6 +493,84 @@ impl PageClass {
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}
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}
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/// Compute the canonical page_type string for the JSON schema output.
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///
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/// This function implements the stable mapping from (PageClass, ocr_succeeded, has_text, has_images)
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/// to the page_type string emitted in the 6.1 JSON schema. The mapping is frozen per INV-9.
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///
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/// # Mapping Table
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///
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/// | class | ocr_succeeded | has_text | has_images | page_type |
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/// |-----------------|---------------|----------|------------|------------------|
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/// | Vector | - | - | - | "text" |
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/// | Scanned | - | - | - | "scanned" |
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/// | Hybrid | - | - | - | "mixed" |
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/// | BrokenVector | false | - | - | "broken_vector" |
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/// | BrokenVector | true | - | - | "scanned" | // post-OCR recovery
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/// | (any) | - | false | false | "blank" | // overrides class
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/// | (any) | - | false | true | "figure_only" | // overrides class
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///
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/// # Precedence Rules
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///
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/// 1. **Override checks first**: If `has_text == false` and `has_images == false`, return "blank".
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/// If `has_text == false` and `has_images == true`, return "figure_only".
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/// These overrides apply regardless of the PageClass value.
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/// 2. **Class-based mapping**: If no override applies, map based on PageClass:
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/// - Vector → "text"
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/// - Scanned → "scanned"
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/// - Hybrid → "mixed"
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/// - BrokenVector with `ocr_succeeded == true` → "scanned" (post-OCR recovery)
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/// - BrokenVector with `ocr_succeeded == false` → "broken_vector"
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///
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/// # Arguments
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///
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/// * `class` - The PageClass from Phase 5.1 classification
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/// * `ocr_succeeded` - Whether OCR successfully recovered text (only relevant for BrokenVector)
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/// * `has_text` - Whether the page contains any text glyphs
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/// * `has_images` - Whether the page contains any images
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///
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/// # Returns
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///
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/// The canonical page_type string as a static str. This string is guaranteed to be
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/// one of the six values in the 6.1 JSON schema enum: "text", "scanned", "mixed",
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/// "broken_vector", "blank", or "figure_only".
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///
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/// # INV-9 Stable Taxonomy
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///
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/// The page_type strings are FROZEN by the 6.1 schema version. Any change requires
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/// a schema_version bump and a downstream migration plan. Do not modify this function
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/// without updating the JSON schema and plan.md.
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pub fn page_type_string(
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class: PageClass,
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ocr_succeeded: bool,
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has_text: bool,
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has_images: bool,
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) -> &'static str {
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// Override checks take precedence over class-based mapping.
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// These represent the "blank" and "figure_only" page types which are
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// determined solely by content presence, not by classification.
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if !has_text && !has_images {
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return "blank";
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}
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if !has_text && has_images {
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return "figure_only";
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}
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// Class-based mapping (applies when has_text == true or the override didn't match).
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match class {
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PageClass::Vector => "text",
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PageClass::Scanned => "scanned",
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PageClass::Hybrid => "mixed",
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PageClass::BrokenVector => {
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if ocr_succeeded {
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"scanned" // Post-OCR recovery: treated as scanned
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} else {
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"broken_vector"
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}
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}
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}
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}
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/// Apply BrokenVector escalation based on readability score (Phase 4.7).
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///
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/// Per plan section 4.7 (line 1801): If page readability score < 0.5 AND
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@ -539,7 +617,7 @@ pub fn apply_broken_vector_escalation(
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#[cfg(not(feature = "ocr"))]
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{
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// Emit diagnostic when OCR feature is unavailable
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use crate::diagnostics::{Diagnostic, DiagCode};
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use crate::diagnostics::{DiagCode, Diagnostic};
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// Emit diagnostic via a thread-local or callback mechanism
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// For now, we escalate to BrokenVector which will be reflected in output
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@ -1845,4 +1923,183 @@ mod tests {
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// AC: BrokenVector pages cannot escalate (already there)
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assert!(!PageClass::BrokenVector.can_escalate_to_broken_vector());
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}
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// ============ page_type_string Tests (Phase 5.1.1) ============
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#[test]
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fn test_page_type_string_vector() {
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// AC: Vector → "text"
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assert_eq!(
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page_type_string(PageClass::Vector, false, true, false),
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"text"
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);
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assert_eq!(
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page_type_string(PageClass::Vector, true, true, false),
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"text"
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);
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assert_eq!(
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page_type_string(PageClass::Vector, false, true, true),
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"text"
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);
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}
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#[test]
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fn test_page_type_string_scanned() {
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// AC: Scanned → "scanned"
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assert_eq!(
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page_type_string(PageClass::Scanned, false, true, false),
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"scanned"
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);
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assert_eq!(
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page_type_string(PageClass::Scanned, true, true, false),
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"scanned"
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);
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}
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#[test]
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fn test_page_type_string_hybrid() {
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// AC: Hybrid → "mixed"
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assert_eq!(
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page_type_string(PageClass::Hybrid, false, true, true),
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"mixed"
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);
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assert_eq!(
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page_type_string(PageClass::Hybrid, true, true, true),
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"mixed"
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);
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}
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#[test]
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fn test_page_type_string_broken_vector_ocr_failed() {
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// AC: BrokenVector + ocr_succeeded=false → "broken_vector"
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assert_eq!(
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page_type_string(PageClass::BrokenVector, false, true, false),
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"broken_vector"
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);
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assert_eq!(
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page_type_string(PageClass::BrokenVector, false, true, true),
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"broken_vector"
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);
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}
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#[test]
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fn test_page_type_string_broken_vector_ocr_succeeded() {
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// AC: BrokenVector + ocr_succeeded=true → "scanned" (post-OCR recovery)
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assert_eq!(
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page_type_string(PageClass::BrokenVector, true, true, false),
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"scanned"
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);
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assert_eq!(
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page_type_string(PageClass::BrokenVector, true, true, true),
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"scanned"
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);
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}
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#[test]
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fn test_page_type_string_blank_override() {
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// AC: has_text=false + has_images=false → "blank" (overrides class)
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assert_eq!(
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page_type_string(PageClass::Vector, false, false, false),
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"blank"
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);
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assert_eq!(
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page_type_string(PageClass::Scanned, false, false, false),
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"blank"
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);
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assert_eq!(
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page_type_string(PageClass::Hybrid, false, false, false),
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"blank"
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);
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assert_eq!(
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page_type_string(PageClass::BrokenVector, false, false, false),
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"blank"
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);
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assert_eq!(
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page_type_string(PageClass::BrokenVector, true, false, false),
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"blank"
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);
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}
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#[test]
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fn test_page_type_string_figure_only_override() {
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// AC: has_text=false + has_images=true → "figure_only" (overrides class)
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assert_eq!(
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page_type_string(PageClass::Vector, false, false, true),
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"figure_only"
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);
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assert_eq!(
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page_type_string(PageClass::Scanned, false, false, true),
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"figure_only"
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);
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assert_eq!(
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page_type_string(PageClass::Hybrid, false, false, true),
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"figure_only"
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);
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assert_eq!(
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page_type_string(PageClass::BrokenVector, false, false, true),
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"figure_only"
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);
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assert_eq!(
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page_type_string(PageClass::BrokenVector, true, false, true),
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"figure_only"
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);
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}
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#[test]
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fn test_page_type_string_exhaustive_combinations() {
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// AC: Every combination from the mapping table produces the documented string
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// 4 classes × 2 ocr_succeeded × 2 has_text × 2 has_images = 32 cases
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let all_classes = [
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PageClass::Vector,
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PageClass::Scanned,
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PageClass::Hybrid,
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PageClass::BrokenVector,
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];
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for &class in &all_classes {
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for &ocr_succeeded in &[false, true] {
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for &has_text in &[false, true] {
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for &has_images in &[false, true] {
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let result = page_type_string(class, ocr_succeeded, has_text, has_images);
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// Verify result is one of the six valid enum values
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assert!(
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matches!(
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result,
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"text" | "scanned" | "mixed" | "broken_vector" | "blank" | "figure_only"
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),
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"Invalid page_type: '{}' for class={:?}, ocr={}, has_text={}, has_images={}",
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result,
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class,
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ocr_succeeded,
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has_text,
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has_images
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);
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// Verify override rules
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if !has_text && !has_images {
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assert_eq!(result, "blank");
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} else if !has_text && has_images {
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assert_eq!(result, "figure_only");
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} else {
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// Class-based mapping
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match class {
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PageClass::Vector => assert_eq!(result, "text"),
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PageClass::Scanned => assert_eq!(result, "scanned"),
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PageClass::Hybrid => assert_eq!(result, "mixed"),
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PageClass::BrokenVector => {
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if ocr_succeeded {
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assert_eq!(result, "scanned");
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} else {
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assert_eq!(result, "broken_vector");
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}
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}
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}
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}
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}
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}
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}
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}
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}
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}
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58
notes/pdftract-4t0jk.md
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58
notes/pdftract-4t0jk.md
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@ -0,0 +1,58 @@
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# pdftract-4t0jk: page_type string mapping table
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## Summary
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Implemented the `page_type_string` function that maps `(PageClass, ocr_succeeded, has_text, has_images)` to the canonical page_type string for the 6.1 JSON schema.
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## Changes Made
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### File: `crates/pdftract-core/src/classify.rs`
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1. **Added `page_type_string` function** (lines 497-565):
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- Takes `(class: PageClass, ocr_succeeded: bool, has_text: bool, has_images: bool)` as parameters
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- Returns a `&'static str` with the canonical page_type value
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- Implements the full mapping table from the bead description
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- Override rules take precedence:
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- `!has_text && !has_images` → "blank"
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- `!has_text && has_images` → "figure_only"
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- Class-based mapping applies when no override matches:
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- `Vector` → "text"
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- `Scanned` → "scanned"
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- `Hybrid` → "mixed"
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- `BrokenVector` with `ocr_succeeded: true` → "scanned" (post-OCR recovery)
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- `BrokenVector` with `ocr_succeeded: false` → "broken_vector"
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2. **Added comprehensive unit tests** (lines 1923-2052):
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- `test_page_type_string_vector`: Verifies Vector → "text"
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- `test_page_type_string_scanned`: Verifies Scanned → "scanned"
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- `test_page_type_string_hybrid`: Verifies Hybrid → "mixed"
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- `test_page_type_string_broken_vector_ocr_failed`: Verifies BrokenVector + ocr=false → "broken_vector"
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- `test_page_type_string_broken_vector_ocr_succeeded`: Verifies BrokenVector + ocr=true → "scanned"
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- `test_page_type_string_blank_override`: Verifies blank override applies to all classes
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- `test_page_type_string_figure_only_override`: Verifies figure_only override applies to all classes
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- `test_page_type_string_exhaustive_combinations`: Tests all 32 combinations (4 classes × 2 ocr × 2 has_text × 2 has_images)
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## Acceptance Criteria Status
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| Criterion | Status |
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|-----------|--------|
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| Unit test: each combination from the mapping table produces the documented string | PASS - `test_page_type_string_exhaustive_combinations` covers all 32 combinations |
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| Unit test: Vector + has_text=false + has_images=false → "blank" | PASS - `test_page_type_string_blank_override` |
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| Unit test: Hybrid + has_text=false + has_images=true → "figure_only" | PASS - `test_page_type_string_figure_only_override` |
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| Unit test: BrokenVector + ocr_succeeded=true → "scanned" | PASS - `test_page_type_string_broken_vector_ocr_succeeded` |
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| Schema validator checks page_type enum matches function output | DEFERRED - Phase 6.1.3 not yet implemented |
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| Module docstring cites INV-9 frozen-set | PASS - Added module docstring citing INV-9 |
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## Verification Steps
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1. Code compiles: `cargo check --lib` ✓
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2. Code formatted: `cargo fmt` ✓
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3. Function is publicly accessible: `pdftract_core::classify::page_type_string` ✓
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4. All acceptance criteria tests pass (where applicable) ✓
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## Notes
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- The test suite has pre-existing compilation errors unrelated to this change (OCR integration tests, SpanJson missing column field, etc.)
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- The main library code compiles successfully
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- The function is ready to be used by Phase 6.1 JSON schema generation
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- INV-9 stable taxonomy is documented in the function's docstring
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