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//! The slide XML parser and whole-deck slide reading.
use quick_xml::events::attributes::Attributes;
use quick_xml::events::Event;
use quick_xml::Reader;
use std::io::BufReader;
use crate::entities::read_event_folding_entities;
use super::archive::{find_notes_for_slide, parse_notes_xml, read_zip_entry, PptxArchive};
use super::slide_model::SlideContent;
use super::xml_util::local_name;
// ── Slide XML parser ──────────────────────────────────────────────────────────
/// `<dgm:relIds r:dm="rId2" r:lo=… r:qs=… r:cs=…/>` — only `dm` (the *data
/// model*) carries text; the others are layout, quick-style and colours.
fn diagram_data_rid(attrs: Attributes<'_>) -> Option<String> {
for attr in attrs.flatten() {
let key = attr.key.as_ref();
let local = key.rsplit(|b| *b == b':').next().unwrap_or(key);
if local == b"dm" {
let v = attr.unescape_value().ok()?.trim().to_string();
return (!v.is_empty()).then_some(v);
}
}
None
}
/// `<c:chart r:id="rId2"/>` inside a `<a:graphicData>` — the pointer to the
/// part holding the plotted data.
fn chart_rel_id(attrs: Attributes<'_>) -> Option<String> {
for attr in attrs.flatten() {
let key = attr.key.as_ref();
let local = key.rsplit(|b| *b == b':').next().unwrap_or(key);
if local == b"id" {
let v = attr.unescape_value().ok()?.trim().to_string();
return (!v.is_empty()).then_some(v);
}
}
None
}
pub fn parse_slide_xml(xml_bytes: &[u8]) -> Result<SlideContent, String> {
let mut reader = Reader::from_reader(BufReader::new(xml_bytes));
let mut buf = Vec::new();
let mut slide = SlideContent::default();
let mut sp_depth: i32 = 0;
let mut sp_is_title = false;
let mut sp_ph_checked = false;
let mut in_txbody = false;
let mut in_para = false;
let mut para_text = String::new();
let mut shape_paragraphs: Vec<String> = Vec::new();
let mut t_buf = String::new();
let mut in_t = false;
// ── Table-cell extraction state ──────────────────────────────────────────
let mut in_tbl = false;
let mut in_tc = false; // inside <a:tc>
let mut in_tc_body = false; // inside table cell's <a:txBody>
let mut in_tc_para = false; // inside table cell's <a:p>
let mut tc_para_text = String::new();
let mut tc_cell_paras: Vec<String> = Vec::new();
let mut table_row_cells: Vec<String> = Vec::new();
let mut table_all_rows: Vec<String> = Vec::new();
loop {
// Entity references arrive as their own event; fold them back into text.
let mut spill = String::new();
let mut is_entity = false;
match read_event_folding_entities!(reader, &mut buf, &mut spill, &mut is_entity) {
Ok(Event::Eof) => break,
Err(e) => return Err(format!("XML parse error in slide: {e}")),
Ok(Event::Start(ref e)) => {
let local = local_name(e.name());
match local.as_slice() {
b"sp" => {
sp_depth += 1;
if sp_depth == 1 {
sp_is_title = false;
sp_ph_checked = false;
shape_paragraphs.clear();
}
}
b"ph" if sp_depth > 0 && !sp_ph_checked => {
sp_ph_checked = true;
let (mut ph_type, mut ph_idx) = (None::<String>, None::<String>);
for attr in e.attributes().flatten() {
let aname = attr.key.as_ref();
let local = aname.rsplit(|b| *b == b':').next().unwrap_or(aname);
match local {
b"type" => {
ph_type =
attr.unescape_value().ok().map(|v| v.trim().to_string())
}
b"idx" => {
ph_idx =
attr.unescape_value().ok().map(|v| v.trim().to_string())
}
_ => {}
}
}
if let Some(t) = ph_type {
let t_lower = t.to_ascii_lowercase();
sp_is_title =
matches!(t_lower.as_str(), "title" | "ctrtitle" | "subtitle");
} else if ph_idx.as_deref() == Some("0") {
// No type attribute but idx=0 is the title placeholder by convention.
sp_is_title = true;
}
}
b"txBody" if sp_depth > 0 => in_txbody = true,
b"p" if in_txbody => {
in_para = true;
para_text.clear();
}
b"t" if in_para || in_tc_para => {
in_t = true;
t_buf.clear();
}
b"tbl" => {
slide.has_table = true;
in_tbl = true;
table_all_rows.clear();
}
b"tr" if in_tbl => table_row_cells.clear(),
b"tc" if in_tbl => {
in_tc = true;
tc_cell_paras.clear();
}
b"txBody" if in_tc => in_tc_body = true,
b"p" if in_tc_body => {
in_tc_para = true;
tc_para_text.clear();
}
// A SmartArt graphic's text is not in this file at all —
// only the pointer to the part that holds it.
b"relIds" => {
if let Some(rid) = diagram_data_rid(e.attributes()) {
slide.diagram_rids.push(rid);
}
}
// A chart contributes no text to the slide either — only
// the pointer to the part holding its numbers.
b"chart" => {
if let Some(rid) = chart_rel_id(e.attributes()) {
slide.chart_rids.push(rid);
}
}
_ => {}
}
}
Ok(Event::Empty(ref e)) => {
let local = local_name(e.name());
if local.as_slice() == b"relIds" {
if let Some(rid) = diagram_data_rid(e.attributes()) {
slide.diagram_rids.push(rid);
}
}
// `<c:chart r:id=…/>` is self-closing, so this is the arm that
// actually fires for every chart in our fixtures.
if local.as_slice() == b"chart" {
if let Some(rid) = chart_rel_id(e.attributes()) {
slide.chart_rids.push(rid);
}
}
if local.as_slice() == b"ph" && sp_depth > 0 && !sp_ph_checked {
sp_ph_checked = true;
let (mut ph_type, mut ph_idx) = (None::<String>, None::<String>);
for attr in e.attributes().flatten() {
let aname = attr.key.as_ref();
let local_attr = aname.rsplit(|b| *b == b':').next().unwrap_or(aname);
match local_attr {
b"type" => {
ph_type = attr.unescape_value().ok().map(|v| v.trim().to_string())
}
b"idx" => {
ph_idx = attr.unescape_value().ok().map(|v| v.trim().to_string())
}
_ => {}
}
}
if let Some(t) = ph_type {
let t_lower = t.to_ascii_lowercase();
sp_is_title = matches!(t_lower.as_str(), "title" | "ctrtitle" | "subtitle");
} else if ph_idx.as_deref() == Some("0") {
sp_is_title = true;
}
}
}
Ok(Event::Text(ref e)) => {
if in_t {
// One <a:t> arrives as several events when it contains
// entity references, so concatenate verbatim here and let
// the flush at </a:t> do the trimming and joining. Trimming
// per event would put a space inside a word.
t_buf.push_str(e.decode().unwrap_or_default().as_ref());
}
}
Ok(Event::End(ref e)) => {
let local = local_name(e.name());
match local.as_slice() {
b"t" if in_t => {
in_t = false;
let t_buf = std::mem::take(&mut t_buf).trim().to_string();
if !t_buf.is_empty() {
// Route accumulated text to the correct buffer.
if in_tc_para {
if !tc_para_text.is_empty() {
tc_para_text.push(' ');
}
tc_para_text.push_str(&t_buf);
} else {
if !para_text.is_empty() {
para_text.push(' ');
}
para_text.push_str(&t_buf);
}
}
}
b"p" if in_para => {
in_para = false;
let trimmed = para_text.trim().to_string();
if !trimmed.is_empty() {
shape_paragraphs.push(trimmed);
}
para_text.clear();
}
b"txBody" if in_txbody => in_txbody = false,
// ── Table-cell end events ──────────────────────────────────────────
b"p" if in_tc_para => {
in_tc_para = false;
let trimmed = tc_para_text.trim().to_string();
if !trimmed.is_empty() {
tc_cell_paras.push(trimmed);
}
tc_para_text.clear();
}
b"txBody" if in_tc_body => in_tc_body = false,
b"tc" if in_tc => {
in_tc = false;
let cell_text = tc_cell_paras.join(" ").trim().to_string();
table_row_cells.push(cell_text);
tc_cell_paras.clear();
}
b"tr" if in_tbl => {
let row = table_row_cells
.iter()
.filter(|c| !c.trim().is_empty())
.cloned()
.collect::<Vec<_>>()
.join(" | ");
if !row.trim().is_empty() {
table_all_rows.push(row);
}
table_row_cells.clear();
}
b"tbl" if in_tbl => {
in_tbl = false;
let table_text = table_all_rows
.iter()
.filter(|r| !r.trim().is_empty())
.cloned()
.collect::<Vec<_>>()
.join("\n");
if !table_text.is_empty() {
slide.body_paragraphs.push(table_text);
}
table_all_rows.clear();
}
b"sp" if sp_depth > 0 => {
sp_depth -= 1;
if sp_depth == 0 {
let combined = shape_paragraphs.join("\n").trim().to_string();
if !combined.is_empty() {
if sp_is_title && slide.title.is_none() {
slide.title = Some(combined);
} else {
slide.body_paragraphs.push(combined);
}
}
shape_paragraphs.clear();
sp_is_title = false;
sp_ph_checked = false;
}
}
_ => {}
}
}
_ => {}
}
buf.clear();
}
Ok(slide)
}
/// Read and parse all slides from the archive. Returns (slide_number, SlideContent) pairs
/// in sorted order; does not filter out empty slides — callers decide what to skip.
pub fn read_all_slides(
archive: &mut PptxArchive,
slide_names: &[(usize, String)],
) -> Result<Vec<(usize, SlideContent)>, String> {
let mut slides = Vec::with_capacity(slide_names.len());
for (slide_num, name) in slide_names {
let xml_bytes = read_zip_entry(archive, name)?;
let mut slide = parse_slide_xml(&xml_bytes)?;
// SmartArt keeps its text in a sibling part, so pull it in and append it
// to the body — otherwise every diagram label is silently dropped.
// Best-effort: a broken diagram must not fail the slide.
for part in super::diagram::resolve_diagram_parts(archive, name, &slide.diagram_rids) {
if let Ok(bytes) = read_zip_entry(archive, &part) {
slide
.body_paragraphs
.extend(super::diagram::parse_diagram_xml(&bytes));
}
}
// Charts, same shape. The rows are pushed as body paragraphs so every
// chunking mode picks them up through `all_text()`.
for part in super::chart::resolve_chart_parts(archive, name, &slide.chart_rids) {
if let Ok(bytes) = read_zip_entry(archive, &part) {
let rows = super::chart::parse_chart_xml(&bytes);
if !rows.is_empty() {
slide.body_paragraphs.push("Chart".to_string());
for row in rows {
slide.body_paragraphs.push(row.join(" | "));
}
}
}
}
// Load speaker notes via the slide's .rels file (best-effort; ignore failures).
if let Some(notes_path) = find_notes_for_slide(archive, name) {
if let Ok(notes_bytes) = read_zip_entry(archive, ¬es_path) {
slide.notes_text = parse_notes_xml(¬es_bytes);
}
}
slides.push((*slide_num, slide));
}
Ok(slides)
}