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910b70bb5f
* M7: keep embedded CMap ranges compact instead of truncating expansion A ToUnicode CMap's sequential bfrange used to expand into one HashMap entry per code, and the parser stopped at 2^20 expanded codes. A valid CMap with more codes than that lost every mapping past the cap. Each sequential range is now one record. Codes below 65 536 find their covering record in a table, higher codes by binary search over a cover index; the later declaration wins where ranges and explicit entries overlap. Explicit entries keep their strings. The budget counts an explicit entry as one and a range as two, since a range covers at least two codes, so every CMap with at most 2^20 codes is kept whole. encode finds the lowest code per character from the same records. Co-Authored-By: Claude Haiku 5.5 <noreply@anthropic.com> * ToUnicode: size the low-code tables to the codes a font covers --------- Co-authored-by: Claude Haiku 5.5 <noreply@anthropic.com> Co-authored-by: Brandon Thomas <echelon@gmail.com>
1398 lines
62 KiB
Rust
1398 lines
62 KiB
Rust
//! Edit a PDF ▸ Edit text: the text lines already on a page, and replacing a line's text in place.
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//!
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//! A *line* is a run of text-showing operators inside one `BT … ET` on the same baseline, read
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//! from one content stream. Replacing it rewrites only that stream (as a new object, since content
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//! streams may be shared): the first operator of the line shows the new text, the others are
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//! dropped, and every positioning operator stays, so the lines after it keep their places
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//! (`Td`, `T*` and friends move from the line matrix, which showing text doesn't change).
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//!
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//! The new text uses the line's own font when every character has a code and a glyph in it;
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//! otherwise it is set in Helvetica (WinAnsi), and the result says the font was substituted.
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//! Reflowing a paragraph to a new width is not done here (see `edit.text-reflow`).
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use std::collections::HashMap;
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use std::rc::Rc;
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use pdfcraft_content::{Matrix, Op, Pieces, parse, serialize_ops};
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use pdfcraft_cos::{Dict, Document, Object, PdfString, Stream};
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use pdfcraft_fonts::pdf::Metrics;
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use pdfcraft_fonts::{CraftFont, GlyphError, japanese_glyph_from};
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use crate::EditError;
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/// One line of existing text.
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#[derive(Clone, Debug, PartialEq)]
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pub struct TextLine {
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/// The line's text as shown.
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pub text: String,
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/// Its box in user space.
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pub rect: [f64; 4],
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/// The font's resource name and `/BaseFont` (or Type 3 descriptor's `/FontName`), and its size in text space.
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pub font: String,
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pub base_font: String,
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pub size: f64,
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pub bold: bool,
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pub italic: bool,
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/// The current fill colour as RGB.
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pub color: [f64; 3],
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/// Whether new text in this font can only be shown by substituting another font (no
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/// Unicode mapping for the line, so nothing could be reused).
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pub decodable: bool,
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/// The content stream piece the line starts in, and its operators (indices into the page's
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/// streams parsed joined).
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stream: usize,
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ops: Vec<usize>,
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/// Where the line starts: text matrix (text space), the state there, and its `BT`.
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origin: Origin,
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}
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/// Text and graphics state captured for rewriting.
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#[derive(Clone, Debug, PartialEq)]
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struct TextState {
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font: Option<(String, f64)>,
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char_spacing: f64,
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word_spacing: f64,
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scale: f64,
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leading: f64,
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rise: f64,
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fill: Vec<Op>,
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}
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impl TextState {
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fn of(ts: &Ts) -> Self {
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TextState {
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font: ts.font.as_ref().map(|(n, _)| (String::from_utf8_lossy(n).into_owned(), ts.size)),
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char_spacing: ts.char_spacing,
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word_spacing: ts.word_spacing,
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scale: ts.scale,
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leading: ts.leading,
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rise: ts.rise,
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fill: ts.fill.clone(),
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}
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}
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/// Operators that set this state (inside a text object).
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fn ops(&self) -> Vec<Op> {
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let n = pdfcraft_content::num;
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let mut v = Vec::new();
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if let Some((f, size)) = &self.font {
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v.push(Op::new("Tf", vec![Object::name(f), n(*size)]));
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}
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v.push(Op::new("Tc", vec![n(self.char_spacing)]));
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v.push(Op::new("Tw", vec![n(self.word_spacing)]));
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v.push(Op::new("Tz", vec![n(self.scale * 100.0)]));
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v.push(Op::new("TL", vec![n(self.leading)]));
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v.push(Op::new("Ts", vec![n(self.rise)]));
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v.extend(self.fill.iter().cloned());
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v
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}
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}
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#[derive(Clone, Debug, PartialEq)]
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struct Origin {
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tm: [f64; 6],
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/// The text line matrix there (where the next line's Td/T* starts from).
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tlm: [f64; 6],
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/// Text-space units → user space (the scale of the text rendering matrix's y axis).
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k: f64,
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/// The CTM there (current space → page space), for moving the paragraph in page space.
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ctm: [f64; 6],
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baseline: f64,
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x: f64,
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state: TextState,
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bt_op: usize,
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bt_state: TextState,
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}
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/// A paragraph: consecutive lines in one stream with the same font and size, aligned on the left
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/// and regularly spaced.
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#[derive(Clone, Debug, PartialEq)]
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pub struct TextBlock {
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/// The lines' text joined with spaces (lines that ended in a hyphen are joined directly).
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pub text: String,
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pub rect: [f64; 4],
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pub base_font: String,
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pub size: f64,
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pub bold: bool,
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pub italic: bool,
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/// The text fill colour as RGB, used by the visual editor and preserved when no colour
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/// override is requested.
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pub color: [f64; 3],
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/// Indexes into [`text_lines`].
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pub lines: Vec<usize>,
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}
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impl TextLine {
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/// The baseline's height in user space.
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pub fn origin_baseline(&self) -> f64 {
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self.origin.baseline
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}
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}
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/// What replacing a line did.
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#[derive(Clone, Debug, PartialEq)]
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pub struct LineEdit {
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/// `Some(font)` when the line's font couldn't show the new text and Helvetica was used.
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pub substituted: Option<String>,
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}
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#[derive(Clone)]
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struct Ts {
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ctm: Matrix,
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/// The operators that set the current fill colour (`g`, `rg`, `k`, or `cs` + `sc`/`scn`).
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fill: Vec<Op>,
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font: Option<(Vec<u8>, Rc<Metrics>)>,
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size: f64,
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char_spacing: f64,
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word_spacing: f64,
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scale: f64,
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leading: f64,
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rise: f64,
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}
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fn content_streams(doc: &Document, page: &Dict) -> Vec<(Object, Vec<u8>)> {
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let list: Vec<Object> = match page.get(b"Contents") {
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None => Vec::new(),
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Some(c) => match &*doc.resolve(c) {
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Object::Array(a) => a.clone(),
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_ => vec![c.clone()],
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},
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};
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list.into_iter()
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.map(|o| {
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let data = match &*doc.resolve(&o) {
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Object::Stream(s) => s.decoded().unwrap_or_default(),
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_ => Vec::new(),
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};
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(o, data)
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})
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.collect()
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}
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/// Rewrite a page's content (its streams joined, see [`Pieces`]): `edit(i)` gives the operators
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/// to insert before operator `i` of `ops` (parsed from the joined pieces) and whether to keep it.
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/// Everything else is copied byte for byte. A page's streams are one stream in pieces, split
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/// between any two tokens (ISO 32000-2 §7.8.2), so an operator's operands can end one piece and
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/// its keyword start the next; removing or replacing it rewrites every piece it spans. Returns
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/// each piece's new bytes.
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fn splice(pieces: &Pieces, ops: &[Op], mut edit: impl FnMut(usize) -> (Vec<Op>, bool)) -> Vec<Vec<u8>> {
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let data = pieces.data();
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let mut edits = Vec::new();
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for (i, op) in ops.iter().enumerate() {
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let (insert, keep) = edit(i);
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if insert.is_empty() && keep {
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continue;
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}
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let mut bytes = Vec::new();
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if !insert.is_empty() {
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if op.span.start.checked_sub(1).and_then(|p| data.get(p)).is_some_and(|b| !b.is_ascii_whitespace()) {
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bytes.push(b'\n');
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}
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bytes.extend_from_slice(&serialize_ops(&insert));
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}
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let end = if keep { op.span.start } else { op.span.end };
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edits.push((op.span.start..end, bytes));
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}
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pieces.splice(edits)
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}
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/// The page's `/Contents` after a [`splice`]: pieces whose bytes changed become new streams
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/// (keeping their dictionaries), the others stay as they were.
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fn rewritten_contents(doc: &mut Document, streams: &[(Object, Vec<u8>)], new: Vec<Vec<u8>>) -> Object {
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let mut contents: Vec<Object> = Vec::with_capacity(streams.len());
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for ((obj, old), data) in streams.iter().zip(new) {
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if *old == data {
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contents.push(obj.clone());
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continue;
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}
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let mut dict = match &*doc.resolve(obj) {
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Object::Stream(s) => s.dict.clone(),
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_ => Dict::new(),
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};
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dict.remove(b"Length");
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contents.push(Object::Ref(doc.add(Object::Stream(Stream::flate(dict, &data)))));
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}
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match <[Object; 1]>::try_from(contents) {
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Ok([one]) => one,
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Err(many) => Object::Array(many),
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}
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}
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fn page_dict(doc: &Document, page: usize) -> Result<pdfcraft_model::Page, EditError> {
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pdfcraft_model::pages(doc).into_iter().nth(page).ok_or(EditError::NoSuchPage(page))
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}
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fn fill_color(fill: &[Op]) -> [f64; 3] {
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let Some(op) = fill.iter().rev().find(|op| matches!(op.op.as_slice(), b"g" | b"rg" | b"k")) else {
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return [0.0, 0.0, 0.0];
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};
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match op.op.as_slice() {
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b"g" => {
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let v = op.operands.first().and_then(Object::as_f64).unwrap_or(0.0).clamp(0.0, 1.0);
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[v, v, v]
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}
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b"rg" => [
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op.operands.first().and_then(Object::as_f64).unwrap_or(0.0).clamp(0.0, 1.0),
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op.operands.get(1).and_then(Object::as_f64).unwrap_or(0.0).clamp(0.0, 1.0),
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op.operands.get(2).and_then(Object::as_f64).unwrap_or(0.0).clamp(0.0, 1.0),
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],
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b"k" => {
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let c = op.operands.first().and_then(Object::as_f64).unwrap_or(0.0);
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let m = op.operands.get(1).and_then(Object::as_f64).unwrap_or(0.0);
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let y = op.operands.get(2).and_then(Object::as_f64).unwrap_or(0.0);
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let k = op.operands.get(3).and_then(Object::as_f64).unwrap_or(0.0);
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[(1.0 - c) * (1.0 - k), (1.0 - m) * (1.0 - k), (1.0 - y) * (1.0 - k)]
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}
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_ => [0.0, 0.0, 0.0],
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}
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}
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/// The text-showing operators of one stream with their text, font, box and baseline.
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struct Shown {
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op: usize,
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/// The text matrix where it starts (text space), and the state there and at its `BT`.
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tm: Matrix,
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tlm: Matrix,
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state: Ts,
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bt_op: usize,
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bt_state: Ts,
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text: String,
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rect: [f64; 4],
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baseline: f64,
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start_x: f64,
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end_x: f64,
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bt: usize,
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font: Vec<u8>,
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base_font: String,
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size: f64,
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bold: bool,
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italic: bool,
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decodable: bool,
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}
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/// The graphics state carried from one of a page's content streams to the next: the streams
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/// are one stream in pieces (§7.8.2), so a `cm` (AutoCAD scales the whole page in the first
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/// stream), an unbalanced `q`, the font and the colour still apply in the streams after it.
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struct Carry {
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ts: Ts,
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stack: Vec<Ts>,
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}
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impl Carry {
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fn new() -> Self {
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let ts = Ts {
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ctm: Matrix::IDENTITY,
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fill: Vec::new(),
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font: None,
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size: 0.0,
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char_spacing: 0.0,
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word_spacing: 0.0,
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scale: 1.0,
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leading: 0.0,
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rise: 0.0,
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};
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Carry { ts, stack: Vec::new() }
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}
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}
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/// A `Do` met while interpreting: its operator index, XObject name and the state there.
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type Invocation = (usize, Vec<u8>, Ts);
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fn interpret(
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doc: &Document,
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ops: &[Op],
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fonts_res: &Dict,
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cache: &mut HashMap<Vec<u8>, Rc<Metrics>>,
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carry: &mut Carry,
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mut invoked: Option<&mut Vec<Invocation>>,
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) -> Vec<Shown> {
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let mut out = Vec::new();
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let mut ts = carry.ts.clone();
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let mut at_bt = (0usize, ts.clone());
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let mut stack: Vec<Ts> = std::mem::take(&mut carry.stack);
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let (mut tm, mut tlm) = (Matrix::IDENTITY, Matrix::IDENTITY);
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let mut bt = 0usize;
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for (i, op) in ops.iter().enumerate() {
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match op.op.as_slice() {
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b"q" => stack.push(ts.clone()),
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b"Q" => {
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if let Some(s) = stack.pop() {
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ts = s;
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}
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}
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b"cm" => {
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if let Some(m) = op.nums::<6>() {
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ts.ctm = Matrix(m).then(&ts.ctm);
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}
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}
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b"BT" => {
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tm = Matrix::IDENTITY;
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tlm = Matrix::IDENTITY;
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bt += 1;
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at_bt = (i, ts.clone());
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}
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b"g" | b"rg" | b"k" | b"cs" => ts.fill = vec![op.clone()],
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b"sc" | b"scn" => {
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ts.fill.retain(|o| o.is("cs"));
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ts.fill.push(op.clone());
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}
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b"Tf" => {
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ts.size = op.num(1).unwrap_or(ts.size);
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if let Some(name) = op.name(0) {
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let m = cache.entry(name.to_vec()).or_insert_with(|| {
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Rc::new(
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fonts_res
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.get(name)
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.and_then(|f| doc.resolve(f).as_dict().cloned())
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.map(|d| Metrics::from_dict(doc, &d))
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.unwrap_or_else(Metrics::fallback),
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)
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});
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ts.font = Some((name.to_vec(), m.clone()));
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}
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}
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b"Tc" => ts.char_spacing = op.num(0).unwrap_or(0.0),
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b"Tw" => ts.word_spacing = op.num(0).unwrap_or(0.0),
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b"Tz" => ts.scale = op.num(0).unwrap_or(100.0) / 100.0,
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b"TL" => ts.leading = op.num(0).unwrap_or(0.0),
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b"Ts" => ts.rise = op.num(0).unwrap_or(0.0),
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b"Do" => {
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if let (Some(list), Some(name)) = (invoked.as_deref_mut(), op.name(0)) {
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list.push((i, name.to_vec(), ts.clone()));
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}
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}
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b"Td" | b"TD" => {
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if let Some([x, y]) = op.nums::<2>() {
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if op.is("TD") {
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ts.leading = -y;
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}
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tlm = Matrix([1.0, 0.0, 0.0, 1.0, x, y]).then(&tlm);
|
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tm = tlm;
|
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}
|
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}
|
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b"Tm" => {
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if let Some(m) = op.nums::<6>() {
|
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tlm = Matrix(m);
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tm = tlm;
|
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}
|
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}
|
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b"T*" => {
|
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tlm = Matrix([1.0, 0.0, 0.0, 1.0, 0.0, -ts.leading]).then(&tlm);
|
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tm = tlm;
|
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}
|
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b"Tj" | b"TJ" | b"'" | b"\"" => {
|
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if matches!(op.op.as_slice(), b"'" | b"\"") {
|
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if op.is("\"") {
|
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ts.word_spacing = op.num(0).unwrap_or(ts.word_spacing);
|
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ts.char_spacing = op.num(1).unwrap_or(ts.char_spacing);
|
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}
|
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tlm = Matrix([1.0, 0.0, 0.0, 1.0, 0.0, -ts.leading]).then(&tlm);
|
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tm = tlm;
|
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}
|
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let Some((name, m)) = ts.font.clone() else { continue };
|
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// Pieces: strings, and TJ number adjustments.
|
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let pieces: Vec<Object> = match op.op.as_slice() {
|
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b"TJ" => op.operands.first().and_then(Object::as_array).cloned().unwrap_or_default(),
|
||
_ => op.operands.last().cloned().into_iter().collect(),
|
||
};
|
||
let trm0 = tm.then(&ts.ctm);
|
||
let start = trm0.apply(0.0, ts.rise);
|
||
let mut text = String::new();
|
||
let mut decodable = true;
|
||
let mut x_text = 0.0;
|
||
for p in &pieces {
|
||
match p {
|
||
Object::String(s) => {
|
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for (code, len) in m.codes(&s.bytes) {
|
||
match m.text_of(code) {
|
||
Some(t) => text.push_str(&t),
|
||
None => decodable = false,
|
||
}
|
||
let w = m.width(code) * ts.size + ts.char_spacing + if m.is_space(code, len) { ts.word_spacing } else { 0.0 };
|
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x_text += w * ts.scale;
|
||
}
|
||
}
|
||
other => {
|
||
if let Some(n) = other.as_f64() {
|
||
let dx = -n / 1000.0 * ts.size * ts.scale;
|
||
// A large gap inside TJ reads as a space.
|
||
if dx > ts.size * 0.2 && !text.ends_with(' ') {
|
||
text.push(' ');
|
||
}
|
||
x_text += dx;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
tm = Matrix([1.0, 0.0, 0.0, 1.0, x_text, 0.0]).then(&tm);
|
||
let end = tm.then(&ts.ctm).apply(0.0, ts.rise);
|
||
// The box: from descent to ascent along the run.
|
||
let corners = [
|
||
trm0.apply(0.0, ts.rise + m.descent * ts.size),
|
||
trm0.apply(x_text, ts.rise + m.descent * ts.size),
|
||
trm0.apply(0.0, ts.rise + m.ascent * ts.size),
|
||
trm0.apply(x_text, ts.rise + m.ascent * ts.size),
|
||
];
|
||
let rect = corners
|
||
.iter()
|
||
.fold([f64::MAX, f64::MAX, f64::MIN, f64::MIN], |b, p| [b[0].min(p.0), b[1].min(p.1), b[2].max(p.0), b[3].max(p.1)]);
|
||
let size_user = (trm0.0[2].powi(2) + trm0.0[3].powi(2)).sqrt() * ts.size;
|
||
out.push(Shown {
|
||
op: i,
|
||
tm: Matrix([tm.0[0], tm.0[1], tm.0[2], tm.0[3], tm.0[4] - x_text * tm.0[0], tm.0[5] - x_text * tm.0[1]]),
|
||
state: ts.clone(),
|
||
tlm,
|
||
bt_op: at_bt.0,
|
||
bt_state: at_bt.1.clone(),
|
||
text,
|
||
rect,
|
||
baseline: start.1,
|
||
start_x: start.0,
|
||
end_x: end.0,
|
||
bt,
|
||
font: name,
|
||
base_font: m.base_font.clone(),
|
||
size: if size_user > 0.0 { size_user } else { ts.size },
|
||
bold: m.bold,
|
||
italic: m.italic,
|
||
decodable,
|
||
});
|
||
}
|
||
_ => {}
|
||
}
|
||
}
|
||
carry.ts = ts;
|
||
carry.stack = stack;
|
||
out
|
||
}
|
||
|
||
/// The lines of text on a page (0-based), in content order.
|
||
pub fn text_lines(doc: &Document, page: usize) -> Result<Vec<TextLine>, EditError> {
|
||
let p = page_dict(doc, page)?;
|
||
let res = p.dict.get(b"Resources").map(|r| doc.resolve(r)).and_then(|r| r.as_dict().cloned()).unwrap_or_default();
|
||
let fonts_res = res.get(b"Font").map(|f| doc.resolve(f)).and_then(|f| f.as_dict().cloned()).unwrap_or_default();
|
||
let mut cache = HashMap::new();
|
||
let mut lines: Vec<TextLine> = Vec::new();
|
||
let mut carry = Carry::new();
|
||
// The streams are one stream in pieces (§7.8.2), split between any two tokens: parse them
|
||
// joined, so an operator whose operands end one piece still has them.
|
||
let pieces = Pieces::join(&content_streams(doc, &p.dict).into_iter().map(|(_, d)| d).collect::<Vec<_>>());
|
||
let ops = pieces.parse().ops;
|
||
let shown = interpret(doc, &ops, &fonts_res, &mut cache, &mut carry, None);
|
||
let mut last: Option<(usize, usize, f64, f64, f64)> = None; // (piece, bt, baseline, end_x, size)
|
||
for s in shown {
|
||
// A line belongs to the piece its first operator starts in (lines in different pieces
|
||
// aren't joined or grouped, as before; editing rewrites every piece an edit touches).
|
||
let si = ops.get(s.op).map_or(0, |op| pieces.pieces_of(op).0);
|
||
let joins = last.is_some_and(|(piece, bt, base, end, size)| {
|
||
piece == si
|
||
&& bt == s.bt
|
||
&& lines.last().is_some_and(|l| l.font.as_bytes() == s.font.as_slice())
|
||
&& lines.last().is_some_and(|l| {
|
||
(s.size - l.size).abs() < 0.01 && s.bold == l.bold && s.italic == l.italic && fill_color(&s.state.fill) == l.color
|
||
})
|
||
&& (s.baseline - base).abs() < size * 0.3
|
||
&& s.start_x > end - size
|
||
&& s.start_x - end < size * 3.0
|
||
});
|
||
if joins && let Some(l) = lines.last_mut() {
|
||
let gap = s.start_x - last.map_or(s.start_x, |x| x.3);
|
||
if gap > l.size * 0.2 && !l.text.ends_with(' ') && !s.text.starts_with(' ') {
|
||
l.text.push(' ');
|
||
}
|
||
l.text.push_str(&s.text);
|
||
l.rect = [l.rect[0].min(s.rect[0]), l.rect[1].min(s.rect[1]), l.rect[2].max(s.rect[2]), l.rect[3].max(s.rect[3])];
|
||
l.ops.push(s.op);
|
||
l.decodable &= s.decodable;
|
||
l.color = fill_color(&s.state.fill);
|
||
} else {
|
||
lines.push(TextLine {
|
||
text: s.text.clone(),
|
||
rect: s.rect,
|
||
font: String::from_utf8_lossy(&s.font).into_owned(),
|
||
base_font: s.base_font.clone(),
|
||
size: s.size,
|
||
bold: s.bold,
|
||
italic: s.italic,
|
||
color: fill_color(&s.state.fill),
|
||
decodable: s.decodable,
|
||
stream: si,
|
||
ops: vec![s.op],
|
||
origin: Origin {
|
||
tm: s.tm.0,
|
||
tlm: s.tlm.0,
|
||
k: (s.tm.then(&s.state.ctm).0[2].powi(2) + s.tm.then(&s.state.ctm).0[3].powi(2)).sqrt(),
|
||
ctm: s.state.ctm.0,
|
||
baseline: s.baseline,
|
||
x: s.start_x,
|
||
state: TextState::of(&s.state),
|
||
bt_op: s.bt_op,
|
||
bt_state: TextState::of(&s.bt_state),
|
||
},
|
||
});
|
||
}
|
||
last = Some((si, s.bt, s.baseline, s.end_x, s.size.max(1.0)));
|
||
}
|
||
// Lines of only spaces aren't editable text.
|
||
lines.retain(|l| !l.text.trim().is_empty());
|
||
Ok(lines)
|
||
}
|
||
|
||
/// The line `s` continues, or a new one: `last` is the previous run of the same stream
|
||
/// (`bt`, baseline, end x, size).
|
||
fn add_shown(lines: &mut Vec<TextLine>, last: &mut Option<(usize, f64, f64, f64)>, s: Shown, stream: usize) {
|
||
let joins = last.is_some_and(|(bt, base, end, size)| {
|
||
bt == s.bt
|
||
&& lines.last().is_some_and(|l| l.font.as_bytes() == s.font.as_slice())
|
||
&& lines
|
||
.last()
|
||
.is_some_and(|l| (s.size - l.size).abs() < 0.01 && s.bold == l.bold && s.italic == l.italic && fill_color(&s.state.fill) == l.color)
|
||
&& (s.baseline - base).abs() < size * 0.3
|
||
&& s.start_x > end - size
|
||
&& s.start_x - end < size * 3.0
|
||
});
|
||
if joins && let Some(l) = lines.last_mut() {
|
||
let gap = s.start_x - last.map_or(s.start_x, |x| x.2);
|
||
if gap > l.size * 0.2 && !l.text.ends_with(' ') && !s.text.starts_with(' ') {
|
||
l.text.push(' ');
|
||
}
|
||
l.text.push_str(&s.text);
|
||
l.rect = [l.rect[0].min(s.rect[0]), l.rect[1].min(s.rect[1]), l.rect[2].max(s.rect[2]), l.rect[3].max(s.rect[3])];
|
||
l.ops.push(s.op);
|
||
l.decodable &= s.decodable;
|
||
l.color = fill_color(&s.state.fill);
|
||
} else {
|
||
lines.push(TextLine {
|
||
text: s.text.clone(),
|
||
rect: s.rect,
|
||
font: String::from_utf8_lossy(&s.font).into_owned(),
|
||
base_font: s.base_font.clone(),
|
||
size: s.size,
|
||
bold: s.bold,
|
||
italic: s.italic,
|
||
color: fill_color(&s.state.fill),
|
||
decodable: s.decodable,
|
||
stream,
|
||
ops: vec![s.op],
|
||
origin: Origin {
|
||
tm: s.tm.0,
|
||
tlm: s.tlm.0,
|
||
k: (s.tm.then(&s.state.ctm).0[2].powi(2) + s.tm.then(&s.state.ctm).0[3].powi(2)).sqrt(),
|
||
ctm: s.state.ctm.0,
|
||
baseline: s.baseline,
|
||
x: s.start_x,
|
||
state: TextState::of(&s.state),
|
||
bt_op: s.bt_op,
|
||
bt_state: TextState::of(&s.bt_state),
|
||
},
|
||
});
|
||
}
|
||
*last = Some((s.bt, s.baseline, s.end_x, s.size.max(1.0)));
|
||
}
|
||
|
||
/// How deep form XObjects nest before reading stops (they may also refer to themselves).
|
||
pub(crate) const MAX_FORM_DEPTH: usize = 12;
|
||
|
||
/// The most form XObjects one page's walk enters, at any depth. The depth cap alone still lets
|
||
/// a form that draws another form many times fan out exponentially (100 `Do`s on each of 12
|
||
/// levels), which would hang export on a hostile PDF.
|
||
pub(crate) const MAX_FORM_VISITS: usize = 4096;
|
||
|
||
/// A form XObject a page draws: its object, content, resources and its matrix composed with the
|
||
/// CTM at the `Do`.
|
||
pub(crate) struct FormCall {
|
||
pub(crate) obj: Option<pdfcraft_cos::ObjRef>,
|
||
pub(crate) data: Vec<u8>,
|
||
pub(crate) resources: Dict,
|
||
pub(crate) ctm: Matrix,
|
||
}
|
||
|
||
/// The form XObject `name` in `resources`, drawn with `ctm`. `None` for images, missing names
|
||
/// and forms already being read (`path`), nested too deep, or past the page's `visits` budget
|
||
/// ([`MAX_FORM_VISITS`]); each form entered counts one visit.
|
||
pub(crate) fn form_call(
|
||
doc: &Document,
|
||
resources: &Dict,
|
||
name: &[u8],
|
||
ctm: Matrix,
|
||
path: &[pdfcraft_cos::ObjRef],
|
||
visits: &mut usize,
|
||
) -> Option<FormCall> {
|
||
if path.len() >= MAX_FORM_DEPTH || *visits >= MAX_FORM_VISITS {
|
||
return None;
|
||
}
|
||
let xobjects = resources.get(b"XObject").map(|x| doc.resolve(x)).and_then(|x| x.as_dict().cloned())?;
|
||
let o = xobjects.get(name)?;
|
||
let obj = o.as_ref();
|
||
if obj.is_some_and(|r| path.contains(&r)) {
|
||
return None;
|
||
}
|
||
let Object::Stream(s) = &*doc.resolve(o) else { return None };
|
||
if s.dict.name(b"Subtype") != Some(b"Form") {
|
||
return None;
|
||
}
|
||
let m = s.dict.get(b"Matrix").map(|m| doc.resolve(m)).and_then(|m| {
|
||
let a = m.as_array()?;
|
||
let v: Vec<f64> = a.iter().filter_map(|x| doc.resolve(x).as_f64()).collect();
|
||
<[f64; 6]>::try_from(v).ok().filter(|v| v.iter().all(|x| x.is_finite()))
|
||
});
|
||
// A form without its own resources uses the ones it was drawn with (PDF 1.1 files).
|
||
let own = s.dict.get(b"Resources").map(|r| doc.resolve(r)).and_then(|r| r.as_dict().cloned());
|
||
*visits = visits.saturating_add(1);
|
||
Some(FormCall {
|
||
obj,
|
||
data: s.decoded().unwrap_or_default(),
|
||
resources: own.unwrap_or_else(|| resources.clone()),
|
||
ctm: m.map_or(ctm, |m| Matrix(m).then(&ctm)),
|
||
})
|
||
}
|
||
|
||
/// The lines a page shows as it reads, including text drawn by form XObjects (which
|
||
/// [`text_lines`] leaves out because it can only rewrite the page's own streams). Lines from a
|
||
/// form carry a stream number past the page's streams, one per form drawn.
|
||
fn reading_lines(doc: &Document, page: usize) -> Result<Vec<TextLine>, EditError> {
|
||
struct Walk<'a> {
|
||
doc: &'a Document,
|
||
lines: Vec<TextLine>,
|
||
next_stream: usize,
|
||
path: Vec<pdfcraft_cos::ObjRef>,
|
||
visits: usize,
|
||
}
|
||
fn walk(w: &mut Walk, ops: &[Op], resources: &Dict, carry: &mut Carry, stream: usize) {
|
||
let fonts_res = resources.get(b"Font").map(|f| w.doc.resolve(f)).and_then(|f| f.as_dict().cloned()).unwrap_or_default();
|
||
let mut cache = HashMap::new();
|
||
let mut invoked = Vec::new();
|
||
let shown = interpret(w.doc, ops, &fonts_res, &mut cache, carry, Some(&mut invoked));
|
||
let mut last = None;
|
||
let mut forms = invoked.into_iter().peekable();
|
||
for s in shown {
|
||
while let Some((_, name, ts)) = forms.next_if(|f| f.0 < s.op) {
|
||
enter(w, resources, &name, ts);
|
||
// Text after a form starts a new line.
|
||
last = None;
|
||
}
|
||
add_shown(&mut w.lines, &mut last, s, stream);
|
||
}
|
||
for (_, name, ts) in forms {
|
||
enter(w, resources, &name, ts);
|
||
}
|
||
}
|
||
fn enter(w: &mut Walk, resources: &Dict, name: &[u8], ts: Ts) {
|
||
let Some(form) = form_call(w.doc, resources, name, ts.ctm, &w.path, &mut w.visits) else { return };
|
||
let ops = parse(&form.data).ops;
|
||
// The form starts with the graphics state at its `Do`, its own matrix applied.
|
||
let mut carry = Carry { ts: Ts { ctm: form.ctm, ..ts }, stack: Vec::new() };
|
||
let stream = w.next_stream;
|
||
w.next_stream = w.next_stream.saturating_add(1);
|
||
if let Some(r) = form.obj {
|
||
w.path.push(r);
|
||
}
|
||
walk(w, &ops, &form.resources, &mut carry, stream);
|
||
if form.obj.is_some() {
|
||
w.path.pop();
|
||
}
|
||
}
|
||
let p = page_dict(doc, page)?;
|
||
let res = p.dict.get(b"Resources").map(|r| doc.resolve(r)).and_then(|r| r.as_dict().cloned()).unwrap_or_default();
|
||
let streams = content_streams(doc, &p.dict);
|
||
let mut w = Walk { doc, lines: Vec::new(), next_stream: streams.len(), path: Vec::new(), visits: 0 };
|
||
let mut carry = Carry::new();
|
||
for (si, (_, data)) in streams.into_iter().enumerate() {
|
||
walk(&mut w, &parse(&data).ops, &res, &mut carry, si);
|
||
}
|
||
let mut lines = w.lines;
|
||
lines.retain(|l| !l.text.trim().is_empty());
|
||
Ok(lines)
|
||
}
|
||
|
||
/// Text → the bytes that show it in the chosen font.
|
||
type Encoder = Box<dyn Fn(&str) -> Option<Vec<u8>>>;
|
||
|
||
fn is_win_ansi_char(c: char) -> bool {
|
||
c == '\t' || pdfcraft_fonts::win_ansi_byte(c).is_some()
|
||
}
|
||
|
||
fn needs_type3(text: &str) -> bool {
|
||
text.chars().any(|c| !is_win_ansi_char(c))
|
||
}
|
||
|
||
fn source_family(base_font: &str) -> crate::added::Family {
|
||
let name = base_font.to_ascii_lowercase();
|
||
if ["courier", "mono", "consolas", "menlo", "monaco", "lucida console"].iter().any(|s| name.contains(s)) {
|
||
crate::added::Family::Courier
|
||
} else if !name.contains("sans")
|
||
&& ["times", "serif", "roman", "mincho", "cambria", "georgia", "palatino", "garamond"].iter().any(|s| name.contains(s))
|
||
{
|
||
crate::added::Family::Times
|
||
} else {
|
||
crate::added::Family::Helvetica
|
||
}
|
||
}
|
||
|
||
const SUBSTITUTE_NAME: &str = "PCEdHelv";
|
||
const SUBSTITUTE: &[u8] = SUBSTITUTE_NAME.as_bytes();
|
||
const MAX_TYPE3_GLYPHS: usize = 240;
|
||
|
||
#[derive(Clone)]
|
||
struct Type3Fallback {
|
||
name: String,
|
||
/// The family its glyphs come from ("Shippori Mincho").
|
||
family: &'static str,
|
||
codes: Vec<(char, u8, f64)>,
|
||
}
|
||
|
||
fn pdf_num(v: f64) -> String {
|
||
if v.fract() == 0.0 { format!("{v:.0}") } else { format!("{v:.4}").trim_end_matches('0').trim_end_matches('.').to_string() }
|
||
}
|
||
|
||
fn type3_path(face: &CraftFont, ch: char) -> Result<(Vec<u8>, f64), EditError> {
|
||
let glyph = japanese_glyph_from(face, ch).map_err(|e| match e {
|
||
GlyphError::NoFont => no_japanese_font(),
|
||
GlyphError::Missing => EditError::Invalid(format!("no fallback font has a glyph for U+{:04X}", ch as u32)),
|
||
GlyphError::TooComplex => EditError::Invalid(format!("Japanese fallback glyph U+{:04X} is too complex", ch as u32)),
|
||
})?;
|
||
let (dx, width) = proportional(ch, &glyph);
|
||
let scale = 1000.0;
|
||
// d1 is `wx wy llx lly urx ury` (ISO 32000-2 §9.6.4) with a box enclosing the glyph;
|
||
// Acrobat draws a bullet in place of a glyph whose d1 is malformed.
|
||
let b = if glyph.contours.is_empty() { [0.0; 4] } else { glyph.bbox };
|
||
let mut out = format!(
|
||
"{} 0 {} {} {} {} d1\n",
|
||
pdf_num(width * scale),
|
||
pdf_num(((b[0] + dx) * scale).floor()),
|
||
pdf_num((b[1] * scale).floor()),
|
||
pdf_num(((b[2] + dx) * scale).ceil()),
|
||
pdf_num((b[3] * scale).ceil())
|
||
)
|
||
.into_bytes();
|
||
for contour in glyph.contours {
|
||
let Some(first) = contour.first() else { continue };
|
||
out.extend_from_slice(format!("{} {} m\n", pdf_num((first[0] + dx) * scale), pdf_num(first[1] * scale)).as_bytes());
|
||
for p in contour.iter().skip(1) {
|
||
out.extend_from_slice(format!("{} {} l\n", pdf_num((p[0] + dx) * scale), pdf_num(p[1] * scale)).as_bytes());
|
||
}
|
||
out.extend_from_slice(b"h\n");
|
||
}
|
||
out.extend_from_slice(b"f\n");
|
||
Ok((out, width))
|
||
}
|
||
|
||
/// Side bearing (em) given to a respaced glyph on each side.
|
||
const SIDE_BEARING: f64 = 0.05;
|
||
|
||
/// Shift and advance for a fallback glyph. Japanese faces draw Cyrillic and Greek full-width
|
||
/// (one em each, as in JIS X 0208) and have no proportional (`palt`) metrics for them, so a
|
||
/// word set that way reads as letter-spaced. Those letters get their ink width plus a side
|
||
/// bearing instead; everything else keeps the face's own advance.
|
||
fn proportional(ch: char, glyph: &pdfcraft_fonts::GlyphOutline) -> (f64, f64) {
|
||
let respace = matches!(ch, '\u{0370}'..='\u{03FF}' | '\u{0400}'..='\u{052F}' | '\u{1F00}'..='\u{1FFF}');
|
||
let ink = glyph.bbox[2] - glyph.bbox[0];
|
||
if !respace || glyph.contours.is_empty() || !(ink > 0.0 && ink < glyph.width) {
|
||
return (0.0, glyph.width);
|
||
}
|
||
(SIDE_BEARING - glyph.bbox[0], ink + 2.0 * SIDE_BEARING)
|
||
}
|
||
|
||
fn unicode_hex(ch: char) -> String {
|
||
let mut units = [0u16; 2];
|
||
let encoded = ch.encode_utf16(&mut units);
|
||
encoded.iter().map(|u| format!("{u:04X}")).collect()
|
||
}
|
||
|
||
/// This build has no Japanese face to draw replacement text with.
|
||
fn no_japanese_font() -> EditError {
|
||
EditError::Invalid(
|
||
"this text needs PdfCraft's Japanese fallback font, which this build doesn't include \
|
||
(official releases do; to build it in, set CRAFT_FONTS_DIR to a craft-fonts checkout)"
|
||
.into(),
|
||
)
|
||
}
|
||
|
||
/// The first of `faces` (best match first) that has a glyph for every one of `chars`, else the first.
|
||
fn fallback_face<'a>(faces: &[&'a CraftFont], chars: &[char], has_glyph: impl Fn(&CraftFont, char) -> bool) -> Option<&'a CraftFont> {
|
||
faces.iter().copied().find(|face| chars.iter().all(|ch| has_glyph(face, *ch))).or_else(|| faces.first().copied())
|
||
}
|
||
|
||
fn type3_font(doc: &mut Document, fonts_res: &mut Dict, text: &str, family: crate::added::Family, bold: bool) -> Result<Type3Fallback, EditError> {
|
||
let faces = pdfcraft_fonts::document_japanese_fonts_for_style(family == crate::added::Family::Times, bold);
|
||
let mut chars = Vec::new();
|
||
for ch in text.chars() {
|
||
if !chars.contains(&ch) {
|
||
if chars.len() >= MAX_TYPE3_GLYPHS {
|
||
return Err(EditError::Invalid("Japanese replacement has too many unique characters".into()));
|
||
}
|
||
chars.push(ch);
|
||
}
|
||
}
|
||
if chars.is_empty() {
|
||
return Err(EditError::Invalid("replacement text is empty".into()));
|
||
}
|
||
// The faces differ in coverage (e.g. of Cyrillic), so use the best face that has every
|
||
// character. When none has them all, the best face reports the character it lacks.
|
||
let face = fallback_face(&faces, &chars, |face, ch| japanese_glyph_from(face, ch).is_ok()).ok_or_else(no_japanese_font)?;
|
||
let family = face.family;
|
||
let mut codes = Vec::with_capacity(chars.len());
|
||
let mut charprocs = Dict::new();
|
||
let mut widths = Vec::with_capacity(chars.len());
|
||
let mut differences = vec![Object::Int(1)];
|
||
let mut cmap = String::from(
|
||
"/CIDInit /ProcSet findresource begin\n12 dict begin\nbegincmap\n/CMapType 2 def\n1 begincodespacerange\n<01> <FF>\nendcodespacerange\n",
|
||
);
|
||
cmap.push_str(&format!("{} beginbfchar\n", chars.len()));
|
||
for (i, ch) in chars.into_iter().enumerate() {
|
||
let code = u8::try_from(i + 1).map_err(|_| EditError::Invalid("Japanese replacement has too many unique characters".into()))?;
|
||
let glyph_name = format!("g{code:02X}");
|
||
let (path, width) = type3_path(face, ch)?;
|
||
let mut pd = Dict::new();
|
||
pd.set(b"Length".to_vec(), path.len() as i64);
|
||
let proc_ref = doc.add(Object::Stream(Stream::from_raw(pd, path)));
|
||
charprocs.set(glyph_name.as_bytes().to_vec(), Object::Ref(proc_ref));
|
||
differences.push(Object::name(&glyph_name));
|
||
widths.push(Object::Real((width * 1000.0).round()));
|
||
cmap.push_str(&format!("<{code:02X}> <{}>\n", unicode_hex(ch)));
|
||
codes.push((ch, code, width));
|
||
}
|
||
cmap.push_str("endbfchar\nendcmap\nCMapName currentdict /CMap defineresource pop\nend\nend\n");
|
||
let mut cmap_dict = Dict::new();
|
||
cmap_dict.set(b"Length".to_vec(), cmap.len() as i64);
|
||
let cmap_ref = doc.add(Object::Stream(Stream::from_raw(cmap_dict, cmap.into_bytes())));
|
||
let mut encoding = Dict::new();
|
||
encoding.set(b"Type".to_vec(), Object::name("Encoding"));
|
||
encoding.set(b"Differences".to_vec(), Object::Array(differences));
|
||
let mut font = Dict::new();
|
||
font.set(b"Type".to_vec(), Object::name("Font"));
|
||
font.set(b"Subtype".to_vec(), Object::name("Type3"));
|
||
font.set(b"Name".to_vec(), Object::name("PCJapanese"));
|
||
let mut descriptor = Dict::new();
|
||
descriptor.set(b"Type".to_vec(), Object::name("FontDescriptor"));
|
||
descriptor.set(b"FontName".to_vec(), Object::name(&format!("{}-{}", face.family, face.style).replace(' ', "")));
|
||
descriptor.set(b"FontFamily".to_vec(), Object::String(PdfString::literal(face.family.as_bytes().to_vec())));
|
||
descriptor.set(b"Flags".to_vec(), Object::Int(if face.family.contains("Mincho") { 6 } else { 4 }));
|
||
descriptor.set(b"ItalicAngle".to_vec(), Object::Int(0));
|
||
// PDF 1.7 tables 5.9 and 5.19: a Type 3 descriptor is indirect; Ascent/Descent may be omitted.
|
||
font.set(b"FontDescriptor".to_vec(), Object::Ref(doc.add(Object::Dict(descriptor))));
|
||
font.set(b"FontBBox".to_vec(), Object::Array(vec![Object::Int(0), Object::Int(-300), Object::Int(1000), Object::Int(1000)]));
|
||
font.set(
|
||
b"FontMatrix".to_vec(),
|
||
Object::Array(vec![Object::Real(0.001), Object::Int(0), Object::Int(0), Object::Real(0.001), Object::Int(0), Object::Int(0)]),
|
||
);
|
||
font.set(b"FirstChar".to_vec(), Object::Int(1));
|
||
font.set(b"LastChar".to_vec(), Object::Int(codes.len() as i64));
|
||
font.set(b"Widths".to_vec(), Object::Array(widths));
|
||
font.set(b"Encoding".to_vec(), Object::Dict(encoding));
|
||
font.set(b"CharProcs".to_vec(), Object::Dict(charprocs));
|
||
font.set(b"ToUnicode".to_vec(), Object::Ref(cmap_ref));
|
||
let mut name = String::from("PCJp");
|
||
let mut suffix = 0usize;
|
||
while fonts_res.contains(name.as_bytes()) {
|
||
suffix = suffix.saturating_add(1);
|
||
name = format!("PCJp{suffix}");
|
||
}
|
||
fonts_res.set(name.as_bytes().to_vec(), Object::Dict(font));
|
||
Ok(Type3Fallback { name, family, codes })
|
||
}
|
||
|
||
fn type3_encode(fallback: &Type3Fallback, text: &str) -> Option<Vec<u8>> {
|
||
text.chars().map(|ch| fallback.codes.iter().find(|(c, _, _)| *c == ch).map(|(_, code, _)| *code)).collect()
|
||
}
|
||
|
||
/// Replace the text of line `line` (an index into [`text_lines`]) on `page` with `text`.
|
||
pub fn replace_line(doc: &mut Document, page: usize, line: usize, text: &str) -> Result<LineEdit, EditError> {
|
||
let text = text.replace(['\n', '\r'], " ");
|
||
let lines = text_lines(doc, page)?;
|
||
let target = lines.get(line).cloned().ok_or_else(|| EditError::Invalid(format!("page {} has no line {}", page + 1, line + 1)))?;
|
||
let p = page_dict(doc, page)?;
|
||
let mut res = p.dict.get(b"Resources").map(|r| doc.resolve(r)).and_then(|r| r.as_dict().cloned()).unwrap_or_default();
|
||
let mut fonts_res = res.get(b"Font").map(|f| doc.resolve(f)).and_then(|f| f.as_dict().cloned()).unwrap_or_default();
|
||
let streams = content_streams(doc, &p.dict);
|
||
let pieces = Pieces::join(&streams.iter().map(|(_, d)| d.as_slice()).collect::<Vec<_>>());
|
||
let ops = pieces.parse().ops;
|
||
let first = target.ops.first().copied().filter(|i| *i < ops.len()).ok_or_else(|| EditError::Invalid("the page's content changed".into()))?;
|
||
// The line's own font, when it can show every character.
|
||
let font = fonts_res.get(target.font.as_bytes()).and_then(|f| doc.resolve(f).as_dict().cloned()).map(|d| Metrics::from_dict(doc, &d));
|
||
let reused = font.as_ref().and_then(|m| m.encode(&text));
|
||
let mut substituted = None;
|
||
let mut replacement: Vec<Op> = Vec::new();
|
||
// ' and " also move to the next line; keep that.
|
||
match ops[first].op.as_slice() {
|
||
b"'" => replacement.push(Op::new("T*", vec![])),
|
||
b"\"" => {
|
||
replacement.push(Op::new("Tw", vec![ops[first].operands.first().cloned().unwrap_or(Object::Int(0))]));
|
||
replacement.push(Op::new("Tc", vec![ops[first].operands.get(1).cloned().unwrap_or(Object::Int(0))]));
|
||
replacement.push(Op::new("T*", vec![]));
|
||
}
|
||
_ => {}
|
||
}
|
||
match reused {
|
||
Some(bytes) => replacement.push(Op::new("Tj", vec![Object::String(PdfString::literal(bytes))])),
|
||
None => {
|
||
if needs_type3(&text) {
|
||
let fallback = type3_font(doc, &mut fonts_res, &text, source_family(&target.base_font), target.bold)?;
|
||
let bytes = type3_encode(&fallback, &text)
|
||
.ok_or_else(|| EditError::Invalid(format!("\"{text}\" can't be shown by the Japanese fallback")))?;
|
||
let size = font_size_before(&ops, first).unwrap_or(target.size);
|
||
replacement.push(Op::new("Tf", vec![Object::name(&fallback.name), pdfcraft_content::num(size)]));
|
||
replacement.push(Op::new("Tj", vec![Object::String(PdfString::literal(bytes))]));
|
||
replacement.push(Op::new("Tf", vec![Object::name(&target.font), pdfcraft_content::num(size)]));
|
||
substituted = Some(format!("{} Type3", fallback.family));
|
||
} else {
|
||
let win = pdfcraft_fonts::win_ansi(&text);
|
||
// WinAnsi turns what it can't show into '?'; refuse rather than print the wrong thing.
|
||
let back: String = win.iter().map(|b| char::from_u32(u32::from(*b)).unwrap_or('?')).collect();
|
||
if text.chars().zip(back.chars()).any(|(a, b)| b == '?' && a != '?') {
|
||
return Err(EditError::Invalid(format!("\"{text}\" has characters neither {} nor Helvetica can show", target.base_font)));
|
||
}
|
||
// The size in text space: the current Tf's size.
|
||
let size = font_size_before(&ops, first).unwrap_or(target.size);
|
||
let family = source_family(&target.base_font);
|
||
let base = family.base_font(target.bold, target.italic);
|
||
let substitute_name = format!("PCEd{}", base.replace('-', ""));
|
||
replacement.push(Op::new("Tf", vec![Object::name(&substitute_name), pdfcraft_content::num(size)]));
|
||
replacement.push(Op::new("Tj", vec![Object::String(PdfString::literal(win))]));
|
||
replacement.push(Op::new("Tf", vec![Object::name(&target.font), pdfcraft_content::num(size)]));
|
||
substituted = Some(base.to_string());
|
||
let mut f = Dict::new();
|
||
f.set(b"Type".to_vec(), Object::name("Font"));
|
||
f.set(b"Subtype".to_vec(), Object::name("Type1"));
|
||
f.set(b"BaseFont".to_vec(), Object::name(base));
|
||
f.set(b"Encoding".to_vec(), Object::name("WinAnsiEncoding"));
|
||
fonts_res.set(substitute_name.into_bytes(), Object::Dict(f));
|
||
}
|
||
}
|
||
}
|
||
// Rebuild: the line's first operator becomes the replacement, its others go. Copies of the
|
||
// line drawn in the same area go too, so the replacement is all that shows.
|
||
let drops = coincident_ops(&lines, std::slice::from_ref(&target.rect));
|
||
let new_data = splice(&pieces, &ops, |i| if i == first { (std::mem::take(&mut replacement), false) } else { (Vec::new(), !drops.contains(&i)) });
|
||
let contents = rewritten_contents(doc, &streams, new_data);
|
||
let page_ref = p.obj;
|
||
if substituted.is_some() {
|
||
res.set(b"Font".to_vec(), Object::Dict(fonts_res));
|
||
}
|
||
doc.update_dict(page_ref, |d| {
|
||
d.set(b"Contents".to_vec(), contents);
|
||
if substituted.is_some() {
|
||
d.set(b"Resources".to_vec(), Object::Dict(res));
|
||
}
|
||
})?;
|
||
Ok(LineEdit { substituted })
|
||
}
|
||
|
||
/// The size of the last `Tf` before operator `at`.
|
||
fn font_size_before(ops: &[Op], at: usize) -> Option<f64> {
|
||
ops[..at].iter().rev().find(|o| o.is("Tf")).and_then(|o| o.num(1))
|
||
}
|
||
|
||
/// The operators of every line drawn in the same area as one of `rects`. Documents sometimes
|
||
/// draw a line more than once (fake bold, an invisible text layer), and a surviving copy would
|
||
/// show the old text under the replaced line. Copies overlap a member's rect by more than half of
|
||
/// the smaller rect; neighbouring lines share no area.
|
||
fn coincident_ops(lines: &[TextLine], rects: &[[f64; 4]]) -> std::collections::HashSet<usize> {
|
||
let area = |r: [f64; 4]| ((r[2] - r[0]) * (r[3] - r[1])).max(0.0);
|
||
let mut drop = std::collections::HashSet::new();
|
||
for l in lines {
|
||
let covered = rects.iter().any(|m| {
|
||
let ix = (m[2].min(l.rect[2]) - m[0].max(l.rect[0])).max(0.0);
|
||
let iy = (m[3].min(l.rect[3]) - m[1].max(l.rect[1])).max(0.0);
|
||
let small = area(*m).min(area(l.rect));
|
||
small > 0.0 && ix * iy / small > 0.5
|
||
});
|
||
if covered {
|
||
drop.extend(l.ops.iter().copied());
|
||
}
|
||
}
|
||
drop
|
||
}
|
||
|
||
/// The paragraphs on a page (0-based).
|
||
pub fn text_blocks(doc: &Document, page: usize) -> Result<Vec<TextBlock>, EditError> {
|
||
let lines = text_lines(doc, page)?;
|
||
Ok(group_blocks(&lines))
|
||
}
|
||
|
||
/// The paragraphs on a page as a reader sees them, including text drawn by form XObjects
|
||
/// (Export to Word, HTML and RTF). Read-only: indexes into this list are not
|
||
/// [`text_blocks`] indexes, so they can't be passed to [`replace_block`] or [`rewrite_block`].
|
||
pub fn reading_blocks(doc: &Document, page: usize) -> Result<Vec<TextBlock>, EditError> {
|
||
let lines = reading_lines(doc, page)?;
|
||
Ok(group_blocks(&lines))
|
||
}
|
||
|
||
/// Lines that share a left edge, a centre or a right edge (left, centred or right-aligned text).
|
||
fn aligned(a: &TextLine, b: &TextLine) -> bool {
|
||
let tol = b.size.max(1.0);
|
||
let centre = |r: [f64; 4]| (r[0] + r[2]) / 2.0;
|
||
(a.origin.x - b.origin.x).abs() < tol || (centre(a.rect) - centre(b.rect)).abs() < tol || (a.rect[2] - b.rect[2]).abs() < tol
|
||
}
|
||
|
||
fn group_blocks(lines: &[TextLine]) -> Vec<TextBlock> {
|
||
let mut blocks: Vec<TextBlock> = Vec::new();
|
||
let mut gap: Option<f64> = None;
|
||
for (i, l) in lines.iter().enumerate() {
|
||
let joins = i > 0
|
||
&& blocks.last().is_some_and(|b| {
|
||
let Some(&p) = b.lines.last() else { return false };
|
||
let prev = &lines[p];
|
||
let g = prev.origin.baseline - l.origin.baseline;
|
||
prev.stream == l.stream
|
||
&& prev.font == l.font
|
||
&& prev.base_font == l.base_font
|
||
&& prev.bold == l.bold
|
||
&& prev.italic == l.italic
|
||
&& prev.color == l.color
|
||
&& (prev.size - l.size).abs() < 0.01
|
||
&& aligned(prev, l)
|
||
&& g > l.size * 0.8
|
||
&& g < l.size * 2.5
|
||
&& gap.is_none_or(|first| (g - first).abs() < first * 0.2)
|
||
});
|
||
if joins
|
||
&& let Some(b) = blocks.last_mut()
|
||
&& let Some(&p) = b.lines.last()
|
||
{
|
||
let prev = &lines[p];
|
||
gap.get_or_insert(prev.origin.baseline - l.origin.baseline);
|
||
if b.text.ends_with('-') {
|
||
b.text.pop();
|
||
} else {
|
||
b.text.push(' ');
|
||
}
|
||
b.text.push_str(l.text.trim_matches(paragraph_separator));
|
||
b.rect = [b.rect[0].min(l.rect[0]), b.rect[1].min(l.rect[1]), b.rect[2].max(l.rect[2]), b.rect[3].max(l.rect[3])];
|
||
b.lines.push(i);
|
||
} else {
|
||
gap = None;
|
||
blocks.push(TextBlock {
|
||
text: l.text.trim_matches(paragraph_separator).to_string(),
|
||
rect: l.rect,
|
||
base_font: l.base_font.clone(),
|
||
size: l.size,
|
||
bold: l.bold,
|
||
italic: l.italic,
|
||
color: l.color,
|
||
lines: vec![i],
|
||
});
|
||
}
|
||
}
|
||
blocks
|
||
}
|
||
|
||
// An ideographic space carries intentional Japanese spacing, including paragraph indentation.
|
||
// Keep other whitespace normalization unchanged.
|
||
fn paragraph_separator(c: char) -> bool {
|
||
c.is_whitespace() && c != '\u{3000}'
|
||
}
|
||
|
||
/// Greedy word wrapping to `width` with `advance` giving a string's width.
|
||
fn wrap(text: &str, width: f64, advance: impl Fn(&str) -> f64) -> Vec<String> {
|
||
let mut out = Vec::new();
|
||
let mut line = String::new();
|
||
for word in text.split(paragraph_separator).filter(|word| !word.is_empty()) {
|
||
let candidate = if line.is_empty() { word.to_string() } else { format!("{line} {word}") };
|
||
if !line.is_empty() && advance(&candidate) > width {
|
||
out.push(std::mem::take(&mut line));
|
||
line = word.to_string();
|
||
} else {
|
||
line = candidate;
|
||
}
|
||
}
|
||
if !line.is_empty() || out.is_empty() {
|
||
out.push(line);
|
||
}
|
||
out
|
||
}
|
||
|
||
/// Replace paragraph `block` (an index into [`text_blocks`]) with `text`, rewrapped to the
|
||
/// paragraph's width with its line spacing. The paragraph keeps its first line's position, font
|
||
/// (or Helvetica when the font can't show the text), size and colour.
|
||
pub fn replace_block(doc: &mut Document, page: usize, block: usize, text: &str) -> Result<LineEdit, EditError> {
|
||
rewrite_block(doc, page, block, Some(text), &BlockStyle::default())
|
||
}
|
||
|
||
/// Formatting for a rewritten paragraph (`None` keeps the paragraph's own).
|
||
#[derive(Clone, Debug, Default, PartialEq)]
|
||
pub struct BlockStyle {
|
||
/// A standard font family, bold, italic.
|
||
pub family: Option<(crate::added::Family, bool, bool)>,
|
||
/// Override weight without choosing a different family (`None` keeps the source weight).
|
||
pub bold: Option<bool>,
|
||
/// Font size in points (user space).
|
||
pub size: Option<f64>,
|
||
/// Fill colour (RGB 0–1).
|
||
pub color: Option<[f64; 3]>,
|
||
pub align: Option<crate::added::Align>,
|
||
/// Draw a line under each line of text.
|
||
pub underline: Option<bool>,
|
||
/// Line spacing as a multiple of the font size (1.2 is ordinary).
|
||
pub line_spacing: Option<f64>,
|
||
/// Character spacing (points) and horizontal scaling (percent).
|
||
pub char_spacing: Option<f64>,
|
||
pub scale: Option<f64>,
|
||
/// Move the paragraph by `[dx, dy]` in user space (dragging its box).
|
||
pub offset: Option<[f64; 2]>,
|
||
/// Rewrap to this width in user space (dragging the box's edge).
|
||
pub width: Option<f64>,
|
||
}
|
||
|
||
/// Rewrite paragraph `block` with new text (or its own) and formatting, rewrapped to its width.
|
||
pub fn rewrite_block(doc: &mut Document, page: usize, block: usize, text: Option<&str>, style: &BlockStyle) -> Result<LineEdit, EditError> {
|
||
let lines = text_lines(doc, page)?;
|
||
let blocks = group_blocks(&lines);
|
||
let b = blocks.get(block).cloned().ok_or_else(|| EditError::Invalid(format!("page {} has no paragraph {}", page + 1, block + 1)))?;
|
||
let members: Vec<&TextLine> = b.lines.iter().map(|i| &lines[*i]).collect();
|
||
let first = members[0];
|
||
let p = page_dict(doc, page)?;
|
||
let mut res = p.dict.get(b"Resources").map(|r| doc.resolve(r)).and_then(|r| r.as_dict().cloned()).unwrap_or_default();
|
||
let mut fonts_res = res.get(b"Font").map(|f| doc.resolve(f)).and_then(|f| f.as_dict().cloned()).unwrap_or_default();
|
||
let streams = content_streams(doc, &p.dict);
|
||
let pieces = Pieces::join(&streams.iter().map(|(_, d)| d.as_slice()).collect::<Vec<_>>());
|
||
let ops = pieces.parse().ops;
|
||
let text = text.unwrap_or(&b.text).split(paragraph_separator).filter(|word| !word.is_empty()).collect::<Vec<_>>().join(" ");
|
||
let o = &first.origin;
|
||
let (font_name, old_size) = o.state.font.clone().ok_or_else(|| EditError::Invalid("the paragraph has no font".into()))?;
|
||
let k = o.k.max(1e-6);
|
||
// The size in text space: points ÷ the text-to-user scale.
|
||
let size = style.size.map_or(old_size, |pt| (pt / k).max(0.1));
|
||
// Spacing and scaling (text state), with the chosen values.
|
||
let mut ts_state = o.state.clone();
|
||
if let Some(c) = style.char_spacing {
|
||
ts_state.char_spacing = c / k;
|
||
}
|
||
if let Some(sc) = style.scale {
|
||
ts_state.scale = (sc / 100.0).clamp(0.1, 10.0);
|
||
}
|
||
let o_state = ts_state.clone();
|
||
let metrics = fonts_res.get(font_name.as_bytes()).and_then(|f| doc.resolve(f).as_dict().cloned()).map(|d| Metrics::from_dict(doc, &d));
|
||
let reuse = style.family.is_none() && style.bold.is_none() && metrics.as_ref().is_some_and(|m| m.encode(&text).is_some());
|
||
// The chosen style also determines the real Japanese fallback outlines and advances.
|
||
let (family, bold, italic) = style.family.unwrap_or((source_family(&b.base_font), b.bold, b.italic));
|
||
let bold = style.bold.unwrap_or(bold);
|
||
let type3 = if !reuse && needs_type3(&text) { Some(type3_font(doc, &mut fonts_res, &text, family, bold)?) } else { None };
|
||
let std_width = move |s: &str, size: f64| -> f64 {
|
||
match family {
|
||
crate::added::Family::Courier => s.chars().count() as f64 * 0.6 * size,
|
||
crate::added::Family::Times => pdfcraft_fonts::helvetica_width(s, size) * 0.92,
|
||
crate::added::Family::Helvetica => pdfcraft_fonts::helvetica_width(s, size) * if bold { 1.05 } else { 1.0 },
|
||
}
|
||
};
|
||
let [dx, dy] = style.offset.unwrap_or([0.0, 0.0]);
|
||
if !(dx.is_finite() && dy.is_finite()) {
|
||
return Err(EditError::Invalid("the paragraph can't be moved that far".into()));
|
||
}
|
||
// A paragraph keeps its width (or takes the one asked for); a single line grows to the right,
|
||
// up to the page's margin.
|
||
let width = match style.width {
|
||
// Capped at the largest page PDF allows (14 400 pt).
|
||
Some(w) if w.is_finite() => w.clamp(size * k, 14_400.0),
|
||
Some(_) => return Err(EditError::Invalid("the paragraph's width must be a number".into())),
|
||
None if members.len() == 1 => (b.rect[2] - b.rect[0]).max(size * k).max(p.crop(doc)[2] - 36.0 - (b.rect[0] + dx)),
|
||
None => (b.rect[2] - b.rect[0]).max(size * k),
|
||
};
|
||
let advance = |s: &str| -> f64 {
|
||
let t = match (&metrics, reuse) {
|
||
(Some(m), true) => m
|
||
.encode(s)
|
||
.map(|bytes| {
|
||
m.codes(&bytes)
|
||
.iter()
|
||
.map(|(c, l)| m.width(*c) * size + o_state.char_spacing + if m.is_space(*c, *l) { o_state.word_spacing } else { 0.0 })
|
||
.sum::<f64>()
|
||
})
|
||
.unwrap_or(0.0),
|
||
_ if let Some(fallback) = &type3 => {
|
||
fallback.codes.iter().map(|(ch, _, width)| s.chars().filter(|c| c == ch).count() as f64 * width * size).sum::<f64>()
|
||
+ s.chars().count() as f64 * o_state.char_spacing
|
||
}
|
||
_ => std_width(s, size) + s.chars().count() as f64 * o_state.char_spacing,
|
||
};
|
||
t * o_state.scale * k
|
||
};
|
||
let wrapped = wrap(&text, width + 0.5, advance);
|
||
let mut substituted = None;
|
||
let new_font = !reuse;
|
||
let (show_font, encode): (String, Encoder) = if let Some(m) = metrics.clone().filter(|_| reuse) {
|
||
(font_name.clone(), Box::new(move |s: &str| m.encode(s)))
|
||
} else if let Some(fallback) = type3.clone() {
|
||
let name = fallback.name.clone();
|
||
let encoder = fallback.clone();
|
||
substituted = Some(format!("{} Type3", fallback.family));
|
||
(name, Box::new(move |s: &str| type3_encode(&encoder, s)))
|
||
} else {
|
||
let win = pdfcraft_fonts::win_ansi(&text);
|
||
let back: String = win.iter().map(|c| char::from_u32(u32::from(*c)).unwrap_or('?')).collect();
|
||
let base = family.base_font(bold, italic);
|
||
if text.chars().zip(back.chars()).any(|(a, c)| c == '?' && a != '?') {
|
||
return Err(EditError::Invalid(format!("\"{text}\" has characters neither {} nor {base} can show", b.base_font)));
|
||
}
|
||
let mut f = Dict::new();
|
||
f.set(b"Type".to_vec(), Object::name("Font"));
|
||
f.set(b"Subtype".to_vec(), Object::name("Type1"));
|
||
f.set(b"BaseFont".to_vec(), Object::name(base));
|
||
f.set(b"Encoding".to_vec(), Object::name("WinAnsiEncoding"));
|
||
let name = if style.family.is_none() { String::from_utf8_lossy(SUBSTITUTE).into_owned() } else { format!("PCEd{}", base.replace('-', "")) };
|
||
fonts_res.set(name.clone().into_bytes(), Object::Dict(f));
|
||
if style.family.is_none() {
|
||
substituted = Some(base.to_string());
|
||
}
|
||
(name, Box::new(|s: &str| Some(pdfcraft_fonts::win_ansi(s))))
|
||
};
|
||
// Line spacing in text space: the paragraph's own (scaled with the size), or 1.2 × the size.
|
||
let lead = match style.line_spacing {
|
||
Some(m) => size * m.clamp(0.5, 5.0),
|
||
None if members.len() > 1 => (members[0].origin.baseline - members[1].origin.baseline) / k * size / old_size,
|
||
None if o_state.leading > 0.0 => o_state.leading,
|
||
None => size * 1.2,
|
||
};
|
||
let n = pdfcraft_content::num;
|
||
// In its own graphics state, so a new colour (or anything else) stops at the paragraph.
|
||
let mut block_ops = vec![Op::new("q", vec![])];
|
||
// Moved: a translation inside that state. The move is in page space, so it is taken back
|
||
// through the CTM's linear part into the space the paragraph is drawn in.
|
||
if dx != 0.0 || dy != 0.0 {
|
||
let c = o.ctm;
|
||
let back = Matrix([c[0], c[1], c[2], c[3], 0.0, 0.0])
|
||
.invert()
|
||
.ok_or_else(|| EditError::Invalid("the paragraph is drawn in a space it can't be moved in".into()))?;
|
||
let (ax, ay) = back.apply(dx, dy);
|
||
block_ops.push(Op::new("cm", vec![n(1.0), n(0.0), n(0.0), n(1.0), n(ax), n(ay)]));
|
||
}
|
||
block_ops.push(Op::new("BT", vec![]));
|
||
let mut state = o_state.clone();
|
||
state.word_spacing = 0.0;
|
||
state.font = Some((show_font, size));
|
||
if let Some([r, g, bl]) = style.color {
|
||
state.fill = vec![Op::new("rg", vec![n(r), n(g), n(bl)])];
|
||
}
|
||
block_ops.extend(state.ops());
|
||
block_ops.push(Op::new("Tm", o.tm.iter().map(|v| n(*v)).collect()));
|
||
// Alignment: each line's offset from the left edge, in text space.
|
||
let offset = |line: &str| -> f64 {
|
||
let free = (width - advance(line)).max(0.0) / k;
|
||
match style.align {
|
||
Some(crate::added::Align::Center) => free / 2.0,
|
||
Some(crate::added::Align::Right) => free,
|
||
_ => 0.0,
|
||
}
|
||
};
|
||
// Justify: word spacing (single-byte code 32 only) so each line but the last fills the width.
|
||
let single_byte = !reuse || metrics.as_ref().is_some_and(|m| !m.composite);
|
||
let justify = style.align == Some(crate::added::Align::Justify) && single_byte;
|
||
let mut x = 0.0;
|
||
let mut tw_set = 0.0;
|
||
let mut underlines: Vec<(f64, f64, f64)> = Vec::new(); // (x0, x1, y) in text space
|
||
for (i, line) in wrapped.iter().enumerate() {
|
||
let dx = offset(line);
|
||
if i > 0 || dx != 0.0 {
|
||
block_ops.push(Op::new("Td", vec![n(dx - x), n(if i > 0 { -lead } else { 0.0 })]));
|
||
}
|
||
x = dx;
|
||
let spaces = line.matches(' ').count();
|
||
let tw =
|
||
if justify && i + 1 < wrapped.len() && spaces > 0 { (width - advance(line)).max(0.0) / k / o_state.scale / spaces as f64 } else { 0.0 };
|
||
if tw != tw_set {
|
||
block_ops.push(Op::new("Tw", vec![n(tw)]));
|
||
tw_set = tw;
|
||
}
|
||
let bytes = encode(line).ok_or_else(|| EditError::Invalid(format!("\"{line}\" can't be shown")))?;
|
||
block_ops.push(Op::new("Tj", vec![Object::String(PdfString::literal(bytes))]));
|
||
let w = (advance(line) + tw * spaces as f64 * o_state.scale * k) / k;
|
||
underlines.push((dx, dx + w, -(i as f64) * lead - size * 0.12));
|
||
}
|
||
block_ops.push(Op::new("ET", vec![]));
|
||
if style.underline == Some(true) {
|
||
// In text space (the paragraph's text matrix), in its fill colour.
|
||
let colour: Vec<Op> = state
|
||
.fill
|
||
.iter()
|
||
.map(|f| match f.op.as_slice() {
|
||
b"g" => Op::new("G", f.operands.clone()),
|
||
b"rg" => Op::new("RG", f.operands.clone()),
|
||
b"k" => Op::new("K", f.operands.clone()),
|
||
b"cs" => Op::new("CS", f.operands.clone()),
|
||
b"sc" => Op::new("SC", f.operands.clone()),
|
||
_ => Op::new("SCN", f.operands.clone()),
|
||
})
|
||
.collect();
|
||
block_ops.push(Op::new("q", vec![]));
|
||
block_ops.push(Op::new("cm", o.tm.iter().map(|v| n(*v)).collect()));
|
||
block_ops.extend(colour);
|
||
block_ops.push(Op::new("w", vec![n(size * 0.06)]));
|
||
for (x0, x1, y) in underlines {
|
||
block_ops.push(Op::new("m", vec![n(x0), n(y)]));
|
||
block_ops.push(Op::new("l", vec![n(x1), n(y)]));
|
||
}
|
||
block_ops.push(Op::new("S", vec![]));
|
||
block_ops.push(Op::new("Q", vec![]));
|
||
}
|
||
block_ops.push(Op::new("Q", vec![]));
|
||
// The paragraph's operators go, and so does anything drawn in the same area (a fake-bold
|
||
// second copy, an invisible text layer): the new text is all that may show.
|
||
let member_rects: Vec<[f64; 4]> = members.iter().map(|l| l.rect).collect();
|
||
let mut drop = coincident_ops(&lines, &member_rects);
|
||
drop.extend(members.iter().flat_map(|l| l.ops.iter().copied()));
|
||
// Text shown earlier in the same text object stays first: the paragraph then goes where it
|
||
// was, between two halves of the text object, so it keeps its place in reading order.
|
||
let start = first.ops.first().copied().unwrap_or(o.bt_op);
|
||
let split = ops
|
||
.get(o.bt_op..start)
|
||
.unwrap_or_default()
|
||
.iter()
|
||
.enumerate()
|
||
.any(|(i, op)| matches!(op.op.as_slice(), b"Tj" | b"TJ" | b"'" | b"\"") && !drop.contains(&(o.bt_op + i)));
|
||
// What the text after the paragraph expects: the state at its BT (or where it was split).
|
||
let after = if split { &o.state } else { &o.bt_state };
|
||
block_ops.extend(after.ops().into_iter().filter(|op| !op.is("Tf") || after.font.is_some()));
|
||
if split {
|
||
block_ops.insert(0, Op::new("ET", vec![]));
|
||
block_ops.push(Op::new("BT", vec![]));
|
||
block_ops.push(Op::new("Tm", o.tlm.iter().map(|v| n(*v)).collect()));
|
||
}
|
||
let at = if split { start } else { o.bt_op };
|
||
let new_data = splice(&pieces, &ops, |i| {
|
||
let insert = if i == at { std::mem::take(&mut block_ops) } else { Vec::new() };
|
||
(insert, !drop.contains(&i))
|
||
});
|
||
let contents = rewritten_contents(doc, &streams, new_data);
|
||
if new_font {
|
||
res.set(b"Font".to_vec(), Object::Dict(fonts_res));
|
||
}
|
||
let page_ref = p.obj;
|
||
doc.update_dict(page_ref, |d| {
|
||
d.set(b"Contents".to_vec(), contents);
|
||
if new_font {
|
||
d.set(b"Resources".to_vec(), Object::Dict(res));
|
||
}
|
||
})?;
|
||
Ok(LineEdit { substituted })
|
||
}
|
||
|
||
#[cfg(test)]
|
||
mod tests {
|
||
use super::*;
|
||
|
||
#[test]
|
||
fn paragraph_wrapping_keeps_ideographic_spaces() {
|
||
let width = |s: &str| s.chars().count() as f64;
|
||
assert_eq!(wrap("A B C", 4.0, width), ["A B", "C"]);
|
||
assert_eq!(wrap("A\u{a0}B C", 3.0, width), ["A B", "C"]);
|
||
assert_eq!(wrap("A\u{2028}B C", 3.0, width), ["A B", "C"]);
|
||
assert_eq!(wrap(" \tA B\r\nC ", 3.0, width), ["A B", "C"]);
|
||
}
|
||
|
||
#[test]
|
||
fn fallback_face_moves_on_when_the_best_face_lacks_a_character() {
|
||
static JPAN: &[&str] = &["Jpan"];
|
||
let mincho = CraftFont { family: "Mincho", style: "Regular", scripts: JPAN, bytes: b"" };
|
||
let gothic = CraftFont { family: "Gothic", style: "Regular", scripts: JPAN, bytes: b"" };
|
||
let faces = [&mincho, &gothic];
|
||
// Only the Gothic face has the Cyrillic letter.
|
||
let has = |face: &CraftFont, ch: char| ch.is_ascii() || face.family == "Gothic";
|
||
assert_eq!(fallback_face(&faces, &['a', 'ф'], has).map(|f| f.family), Some("Gothic"));
|
||
// Characters the best face has keep it.
|
||
assert_eq!(fallback_face(&faces, &['a', 'b'], has).map(|f| f.family), Some("Mincho"));
|
||
// No face has them all: the best face stays, and names the missing glyph.
|
||
assert_eq!(fallback_face(&faces, &['a', 'ф'], |_, ch| ch.is_ascii()).map(|f| f.family), Some("Mincho"));
|
||
assert!(fallback_face(&[], &['a'], has).is_none());
|
||
}
|
||
}
|