Crate stet_fonts 

Pure-Rust parsers for Type 1, CFF / Type 2, and TrueType fonts, plus the shared geometry primitives they produce.

This crate has no stet-specific dependencies, so it is usable on its own for font-parsing workflows that don’t need a PostScript interpreter or a PDF renderer. The rest of the stet workspace uses it as the foundational font/geometry layer.

What’s here

• geometry — Matrix (affine transforms), PathSegment, PsPath
• type1_parser / charstring — Adobe Type 1 parsing and charstring interpretation (eexec decryption included)
• cff_parser / type2_charstring — Compact Font Format parser and Type 2 charstring interpreter
• truetype — TrueType table accessors, simple + composite glyph resolution, glyf → PsPath conversion
• encoding — StandardEncoding, ISOLatin1Encoding, SymbolEncoding, MacRoman, etc.
• agl — Adobe Glyph List (glyph name ↔ Unicode)
• system_fonts — platform font directory discovery and 35-standard PostScript → URW substitution

Quick example

Parse a Type 1 font and inspect its glyph dictionary:

use stet_fonts::type1_parser::parse_type1;

let data = std::fs::read("NimbusRoman-Regular.t1")?;
let font = parse_type1(&data)?;
println!("font: {} ({} glyphs)", font.font_name, font.charstrings.len());

Scope and non-goals

The surface is shaped around what stet needs to render PDFs and run a PostScript Level 3 interpreter — whole-font parsing with glyph outlines as PsPath. There is no text layout, no shaping, no colour fonts, no variable-font interpolation, and no OpenType GSUB/GPOS/BASE/GDEF tables. For a general-purpose font-layout library, consider ttf-parser, rustybuzz, or skrifa.

Re-exports

pub use geometry::Matrix;

pub use geometry::PathSegment;

pub use geometry::PsPath;

Modules

agl

Adobe Glyph List (AGL) — glyph name → Unicode mapping.

cff_parser

CFF (Compact Font Format) binary parser.

charstring

Type 1 charstring interpreter.

encoding

PostScript standard encoding tables.

geometry

Geometry types: affine transform matrices, path segments, and paths.

system_fonts

System font discovery and caching.

truetype

TrueType (Type 42) glyph parser and path converter.

type1_parser

Type 1 font file (.t1) parser.

type2_charstring

Type 2 charstring interpreter for CFF fonts.

Constants

FONT_SUBSTITUTIONS

Standard PostScript font name → URW replacement filename.

Functions

find_substitution

Look up a font substitution: “Helvetica” → “NimbusSans-Regular”.