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//! Error types.
use std::io::Error as IoError;
use std::path::PathBuf;
use plist::Error as PlistError;
use quick_xml::events::attributes::AttrError;
use quick_xml::{DeError, Error as XmlError};
use thiserror::Error;
pub use crate::shared_types::ColorError;
use crate::write::CustomSerializationError;
use crate::Name;
/// An error that occurs while attempting to read a designspace file from disk.
#[derive(Debug, Error)]
#[non_exhaustive]
pub enum DesignSpaceLoadError {
/// An [`std::io::Error`].
#[error("failed to read designspace file: {0}")]
Io(#[from] IoError),
/// A parse error.
#[error("failed to deserialize designspace: {0}")]
DeError(#[from] DeError),
}
/// An error that occurs while attempting to write a designspace file to disk.
#[derive(Debug, Error)]
pub enum DesignSpaceSaveError {
/// An [`std::io::Error`].
#[error("failed to open/write designspace file: {0}")]
Io(#[from] IoError),
/// A serialization error.
#[error("failed to serialize designspace: {0}")]
SeError(#[from] DeError),
}
/// An error representing a failure to (re)name something.
#[derive(Debug, Error)]
pub enum NamingError {
/// An error returned when an item is duplicated.
#[error("item '{0}' already exists")]
Duplicate(String),
/// An error returned when an expected item is missing.
#[error("item '{0}' does not exist")]
Missing(String),
/// A name is empty, or contains [control characters].
///
/// [control characters]: https://unifiedfontobject.org/versions/ufo3/conventions/#controls
#[error("'{0}' is not a valid name")]
Invalid(String),
/// An error returned when the name "public.default" is used for a non-default layer.
#[error("only the default layer may be named 'public.default'")]
ReservedName,
}
/// An error that occurs while attempting to read a .glif file from disk.
#[derive(Debug, Error)]
#[non_exhaustive]
pub enum GlifLoadError {
/// An [`std::io::Error`].
#[error("failed to read file")]
Io(#[from] IoError),
/// A [`quick_xml::Error`].
#[error("failed to read or parse XML structure")]
Xml(#[from] XmlError),
/// An error in an XML attribute
#[error("error parsing XML attribute")]
XmlAttr(#[from] AttrError),
/// The .glif file was malformed.
#[error("failed to parse glyph data: {0}")]
Parse(ErrorKind),
/// The glyph lib's `public.objectLibs` value was something other than a dictionary.
#[error("the glyph lib's 'public.objectLibs' value must be a dictionary")]
PublicObjectLibsMustBeDictionary,
/// The entry with the given identifier within the glyph lib's `public.objectLibs` dictionary was not a dictionary.
#[error("the glyph lib's 'public.objectLibs' entry for the object with identifier '{0}' must be a dictionary")]
ObjectLibMustBeDictionary(String),
}
/// An error that occurs while attempting to read a UFO package from disk.
#[derive(Debug, Error)]
#[non_exhaustive]
pub enum FontLoadError {
/// The UFO cannot be accessed.
#[error("cannot access UFO package")]
AccessUfoDir(#[source] IoError),
/// Failed to load a file from the data store.
#[error("failed to load data store")]
DataStore(#[source] StoreEntryError),
/// Failed to load the features.fea file.
#[error("failed to read features.fea file")]
FeatureFile(#[source] IoError),
/// Failed to load the fontinfo.plist file.
#[error("failed to load font info data")]
FontInfo(#[source] FontInfoLoadError),
/// The upgrade process failed to move font info data from the old lib.plist schema to the new fontinfo.plist schema.
#[error("failed to upgrade old lib.plist to current fontinfo.plist data: {0}")]
FontInfoV1Upconversion(FontInfoErrorKind),
/// The upgrade process failed to convert kerning groups from old to the new UFO v3 format.
#[error("failed to upconvert groups to the latest supported format")]
GroupsUpconversionFailure(#[source] GroupsValidationError),
/// Failed to load a file from the image store.
#[error("failed to load images store")]
ImagesStore(#[source] StoreEntryError),
/// The (kerning) groups in kerning.plist fail validation.
#[error("failed to load (kerning) groups")]
InvalidGroups(#[source] GroupsValidationError),
/// Failed to load a specific layer.
#[error("failed to load layer '{name}' from '{path}'")]
Layer {
/// The layer name.
name: String,
/// The path to the layer.
path: PathBuf,
/// The underlying error.
source: Box<LayerLoadError>,
},
/// The lib.plist file was something other than a dictionary.
#[error("the lib.plist file must contain a dictionary (<dict>...</dict>)")]
LibFileMustBeDictionary,
/// The UFO does not have a default layer.
#[error("missing the default layer ('glyphs' subdirectory)")]
MissingDefaultLayer,
/// The UFO does not have a default layer.
#[error("cannot find the layercontents.plist file")]
MissingLayerContentsFile,
/// The UFO does not have a metainfo.plist layer.
#[error("cannot find the metainfo.plist file")]
MissingMetaInfoFile,
/// Failed to parse a .plist file.
#[error("failed to parse {name} file")]
ParsePlist {
/// The name of the file.
name: &'static str,
/// The underlying error.
source: PlistError,
},
/// Norad can currently only open UFO (directory) packages.
#[error("only UFO (directory) packages are supported")]
UfoNotADir,
}
/// An error that occurs while attempting to read a UFO layer from disk.
#[derive(Debug, Error)]
#[non_exhaustive]
pub enum LayerLoadError {
/// Loading a glyph from a path failed.
#[error("failed to load glyph '{name}' from '{path}'")]
Glyph {
/// The glyph name.
name: String,
/// The path to the glif file.
path: PathBuf,
/// The underlying error.
source: GlifLoadError,
},
/// Could not find the layer's contents.plist.
#[error("cannot find the contents.plist file")]
MissingContentsFile,
/// Failed to parse a .plist file.
#[error("failed to parse {name} file")]
ParsePlist {
/// The name of the file.
name: &'static str,
/// The underlying error.
source: PlistError,
},
}
/// An error that occurs while attempting to read a UFO fontinfo.plist file from disk.
#[derive(Debug, Error)]
#[non_exhaustive]
pub enum FontInfoLoadError {
/// The upgrade process failed to convert an older fontinfo.plist to newer data structures.
#[error("failed to upgrade fontinfo.plist contents to latest UFO version data: {0}")]
FontInfoUpconversion(FontInfoErrorKind),
/// The UFO lib.plist's `public.objectLibs` entry for the given guideline is not a dictionary.
#[error("the lib.plist file's 'public.objectLibs' entry for the global guideline with identifier '{0}' in the fontinfo.plist file must be a dictionary")]
GlobalGuidelineLibMustBeDictionary(String),
/// The fontinfo.plist file contains invalid data.
#[error("fontinfo.plist contains invalid data: {0}")]
InvalidData(FontInfoErrorKind),
/// Could not parse the UFO's fontinfo.plist.
#[error("failed to parse fontinfo.plist file")]
ParsePlist(#[source] PlistError),
/// The font lib's `public.objectLibs` value was something other than a dictionary.
#[error("the lib.plist file's 'public.objectLibs' value must be a dictionary")]
PublicObjectLibsMustBeDictionary,
}
/// An error pointing to invalid data in the font's info.
#[derive(Debug)]
#[non_exhaustive]
pub enum FontInfoErrorKind {
/// openTypeOS2Selection contained bits 0, 5 or 6.
DisallowedSelectionBits,
/// Guideline identifiers were not unique within the fontinfo.plist file.
DuplicateGuidelineIdentifiers,
/// Found an empty WOFF element or record. If you have them, you have to fill them all in.
EmptyWoffAttribute(&'static str),
/// The openTypeHeadCreated had the wrong format.
InvalidOpenTypeHeadCreatedDate,
/// The openTypeOS2FamilyClass had out of range values.
InvalidOs2FamilyClass,
/// The openTypeOS2Panose field did not have exactly ten elements.
InvalidOs2Panose,
/// A Postscript data list had more elements than the specification allows.
InvalidPostscriptListLength {
/// The name of the property.
name: &'static str,
/// The maximum allowed number of elements.
max_len: u8,
/// The found number of elements.
len: usize,
},
/// A Postscript data list must contain pairs.
PostscriptListMustBePairs(&'static str),
/// Unrecognized UFO v1 fontStyle field.
UnknownFontStyle(i32),
/// Unrecognized UFO v1 msCharSet field.
UnknownMsCharSet(i32),
/// Unrecognized styleMapStyleName.
UnknownStyleMapStyleName,
/// Unrecognized openTypeOS2WidthClass.
UnknownWidthClass(String),
/// Unrecognized WOFF writing direction.
UnknownWoffDirection,
/// The openTypeGaspRangeRecords field was unsorted.
UnsortedGaspEntries,
}
impl std::fmt::Display for FontInfoErrorKind {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
use FontInfoErrorKind::*;
match self {
DisallowedSelectionBits => {
write!(f, "openTypeOS2Selection must not contain bits 0, 5 or 6")
}
DuplicateGuidelineIdentifiers => {
write!(f, "guideline identifiers must be unique within the fontinfo.plist file")
}
EmptyWoffAttribute(s) => {
write!(f, "a '{}' element must not be empty", s)
}
InvalidOpenTypeHeadCreatedDate => {
write!(f, "openTypeHeadCreated must be of format 'YYYY/MM/DD HH:MM:SS'")
}
InvalidOs2FamilyClass => {
write!(f, "openTypeOS2FamilyClass must be two numbers in the range 0-14 and 0-15, respectively")
}
InvalidOs2Panose => {
write!(f, "openTypeOS2Panose must have exactly ten elements")
}
InvalidPostscriptListLength { name, max_len, len } => {
write!(
f,
"the Postscript field '{}' must contain at most {} items but found {}",
name, max_len, len
)
}
PostscriptListMustBePairs(name) => {
write!(f, "the Postscript field '{}' must contain pairs", name)
}
UnknownFontStyle(s) => {
write!(f, "unrecognized fontStyle '{}'", s)
}
UnknownMsCharSet(c) => {
write!(f, "unrecognized msCharSet '{}'", c)
}
UnknownStyleMapStyleName => {
write!(f, "unknown value for styleMapStyleName")
}
UnknownWidthClass(w) => {
write!(f, "unrecognized OS/2 width class '{}'", w)
}
UnknownWoffDirection => {
write!(f, "unknown value for the WOFF direction attribute")
}
UnsortedGaspEntries => {
write!(f, "openTypeGaspRangeRecords must be sorted by their rangeMaxPPEM values")
}
}
}
}
/// An error representing a failure with a particular [`crate::datastore::Store`] entry.
#[derive(Debug, Error)]
#[error("store entry '{path}' is invalid")]
pub struct StoreEntryError {
path: PathBuf,
source: StoreError,
}
impl StoreEntryError {
/// Returns a new [`StoreEntryError`].
pub(crate) fn new(path: PathBuf, source: StoreError) -> Self {
Self { path, source }
}
}
/// An error representing a failure to insert content into a [`crate::datastore::Store`].
#[derive(Clone, Debug, Error)]
#[non_exhaustive]
pub enum StoreError {
/// Tried to insert a path whose ancestor is in the store already, implying nesting a file under a file.
#[error("the parent of the file is a file itself")]
DirUnderFile,
/// The path was empty.
#[error("an empty path cannot be used as a key in the store")]
EmptyPath,
/// The path was neither plain file nor directory, but e.g. a symlink.
#[error("only plain files and directories are allowed, no symlinks")]
NotPlainFileOrDir,
/// The path was absolute; only relative paths are allowed.
#[error("the path must be relative")]
PathIsAbsolute,
/// The path was not a plain file, but e.g. a directory or symlink.
#[error("only plain files are allowed, no symlinks")]
NotPlainFile,
/// The path contained a subdirectory; `images` is a flat directory.
#[error("subdirectories are not allowed in the image store")]
Subdir,
/// The image did not have a valid PNG header.
#[error("an image must be a valid PNG")]
InvalidImage,
/// Encountered an IO error while trying to load data
#[error("encountered an IO error while trying to load content")]
Io(#[from] std::sync::Arc<std::io::Error>),
}
/// An error representing a failure to validate UFO groups.
#[derive(Debug, Error)]
pub enum GroupsValidationError {
/// An error returned when there is an invalid groups name.
#[error("a kerning group name must have at least one character after the common 'public.kernN.' prefix.")]
InvalidName,
/// An error returned when there are overlapping kerning groups.
#[error("the glyph '{glyph_name}' appears in more than one kerning group. Last found in '{group_name}'")]
OverlappingKerningGroups {
/// The glyph name.
glyph_name: Name,
/// The group name.
group_name: Name,
},
}
/// An error returned when there is an inappropriate negative sign on a value.
#[derive(Debug, Error)]
#[error("expected a positive value")]
pub struct ExpectedPositiveValue;
/// An error returned when there is a problem with kurbo contour conversion.
#[cfg(feature = "kurbo")]
#[derive(Debug, Error)]
#[error("failed to convert contour: '{0}'")]
pub struct ConvertContourError(ErrorKind);
#[cfg(feature = "kurbo")]
impl ConvertContourError {
pub(crate) fn new(kind: ErrorKind) -> Self {
ConvertContourError(kind)
}
}
/// An error that occurs while attempting to write a UFO package to disk.
#[derive(Debug, Error)]
#[non_exhaustive]
pub enum FontWriteError {
/// Cannot clean up previous UFO package before writing out new one.
#[error("failed to remove target directory before overwriting")]
Cleanup(#[source] IoError),
/// Failed to create the images directory.
#[error("failed to create store directory '{path}'")]
CreateStoreDir {
/// The path to the entry.
path: PathBuf,
/// The underlying error.
source: IoError,
},
/// Failed to create the UFO package directory.
#[error("failed to create target font directory")]
CreateUfoDir(#[source] IoError),
/// Failed to write out a customly-serialized file.
#[error("failed to write {name} file")]
CustomFile {
/// The name of the file.
name: &'static str,
/// The underlying error.
source: CustomSerializationError,
},
/// Failed to write data entry.
#[error("failed to write data file")]
Data {
/// The path to the entry.
path: PathBuf,
/// The underlying error.
source: IoError,
},
/// Norad does not currently support downgrading to older UFO formats.
#[error("downgrading below UFO v3 is not currently supported")]
Downgrade,
/// Failed to write out the feature.fea file.
#[error("failed to write feature.fea file")]
FeatureFile(#[source] IoError),
/// Failed to write out an image file.
#[error("failed to write image file")]
Image {
/// The path to the entry.
path: PathBuf,
/// The underlying error.
source: IoError,
},
/// The font info contains invalid data.
#[error("font info contains invalid data: {0}")]
InvalidFontInfo(FontInfoErrorKind),
/// The groups contains invalid data.
#[error("failed to write (kerning) groups")]
InvalidGroups(#[source] GroupsValidationError),
/// The data or images store contains invalid data.
#[error("store entry '{path}' is invalid")]
InvalidStoreEntry {
/// The path to the entry.
path: PathBuf,
/// The underlying error.
source: StoreError,
},
/// Failed to write out a layer.
#[error("failed to write layer '{name}' to '{path}'")]
Layer {
/// The name of the layer.
name: String,
/// The path to the layer.
path: PathBuf,
/// The underlying error.
source: Box<LayerWriteError>,
},
/// There exists a `public.objectLibs` lib key when it should be set only by norad.
#[error("the `public.objectLibs` lib key is managed by norad and must not be set manually")]
PreexistingPublicObjectLibsKey,
}
/// An error that occurs while attempting to read a UFO layer from disk.
#[derive(Debug, Error)]
#[non_exhaustive]
pub enum LayerWriteError {
/// Failed to write out the contents.plist file
#[error("failed to write contents.plist file")]
Contents(#[source] CustomSerializationError),
/// Failed to create the layer's directory.
#[error("cannot create layer directory")]
CreateDir(#[source] IoError),
/// Failed to write out a glyph.
#[error("failed to write glyph '{name}' to '{path}'")]
Glyph {
/// The name of the glyph.
name: String,
/// The path to the glyph.
path: PathBuf,
/// The underlying error.
source: GlifWriteError,
},
/// Failed to write out the layerinfo.plist file
#[error("failed to write layerinfo.plist file")]
LayerInfo(#[source] CustomSerializationError),
}
/// An error when attempting to write a .glif file.
#[derive(Debug, Error)]
#[non_exhaustive]
pub enum GlifWriteError {
/// Failed to serialize a glyph to an internal buffer.
#[error("failed to serialize glyph to an internal buffer")]
Buffer(#[source] IoError),
/// When writing out the 'lib' section, we use the plist crate to generate
/// the plist xml, and then strip the preface and closing `</plist>` tag.
///
/// If for some reason the implementation of that crate changes, we could
/// be affected, although this is very unlikely.
#[error("internal error while writing lib data, please open an issue")]
InternalLibWriteError,
/// Failed to write a .glif file to disk.
#[error("failed to write .glif file")]
Io(#[source] IoError),
/// Plist serialization error. Wraps a [PlistError].
#[error("error serializing glyph lib data internally")]
Plist(#[source] PlistError),
/// There exists a `public.objectLibs` glyph lib key when it should be set only by norad.
#[error("the `public.objectLibs` lib key is managed by norad and must not be set manually")]
PreexistingPublicObjectLibsKey,
/// XML serialization error. Wraps a [XmlError].
#[error("error serializing glyph to XML")]
Xml(#[source] XmlError),
}
/// The reason for a glif parse failure.
#[derive(Debug, Clone, Copy)]
pub enum ErrorKind {
/// The glif version is not supported by this library.
UnsupportedGlifVersion,
/// An unknown point type.
UnknownPointType,
/// The first XML element of a glif file is invalid.
WrongFirstElement,
/// Missing a close tag.
MissingCloseTag,
/// Has an invalid hexadecimal value.
BadHexValue,
/// Has an invalid numeric value.
BadNumber,
/// Has an invalid color value.
BadColor,
/// Has an invalid anchor definition.
BadAnchor,
/// Has an invalid point definition.
BadPoint,
/// Has an invalid guideline definition.
BadGuideline,
/// Has an invalid component definition.
BadComponent,
/// Has an invalid image definition.
BadImage,
/// Has an invalid identifier.
BadIdentifier,
/// Name is not a valid [`Name`].
InvalidName,
/// Has an invalid lib.
BadLib,
/// Has an unexected duplicate value.
UnexpectedDuplicate,
/// Has an unexpected move definition.
UnexpectedMove,
/// Has an unexpected smooth definition.
UnexpectedSmooth,
/// Has an unexpected element definition.
UnexpectedElement,
/// Has an unexpected attribute definition.
UnexpectedAttribute,
/// Has an unexpected end of file definition.
UnexpectedEof,
/// Has an unexpected point following an off curve point definition.
UnexpectedPointAfterOffCurve,
/// Has too many off curve points in sequence.
TooManyOffCurves,
/// The contour pen path was not started
PenPathNotStarted,
/// Has trailing off curve points defined.
TrailingOffCurves,
/// Has duplicate identifiers.
DuplicateIdentifier,
/// Has unexepected drawing data.
UnexpectedDrawing,
/// Has incomplete drawing data.
UnfinishedDrawing,
/// Has an unexpected point field.
UnexpectedPointField,
/// Has an unexpected component field.
UnexpectedComponentField,
/// Has an unexpected anchor field.
UnexpectedAnchorField,
/// Has an unexpected guideline field.
UnexpectedGuidelineField,
/// Has an unexpected image field.
UnexpectedImageField,
/// An element that can occur just once occured a second time.
DuplicateElement(&'static str),
/// An element that can occur just once occured a second time.
UnexpectedV1Element(&'static str),
/// An element that can occur just once occured a second time.
UnexpectedV1Attribute(&'static str),
/// A component had an empty `base` attribute.
ComponentEmptyBase,
/// A component was missing a `base` attribute.
ComponentMissingBase,
/// The glyph 'lib' element must contain a dictionary.
LibMustBeDictionary,
/// An angle was out of bounds.
BadAngle,
}
impl std::fmt::Display for ErrorKind {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
use ErrorKind::*;
match self {
UnsupportedGlifVersion => write!(f, "unsupported glif version"),
UnknownPointType => write!(f, "unknown point type"),
WrongFirstElement => write!(f, "wrong first XML element in glif file"),
MissingCloseTag => write!(f, "missing close tag"),
BadHexValue => write!(f, "bad hex value"),
BadNumber => write!(f, "bad number"),
BadColor => write!(f, "bad color"),
BadAnchor => write!(f, "bad anchor"),
BadPoint => write!(f, "bad point"),
BadGuideline => write!(f, "bad guideline"),
BadComponent => write!(f, "bad component"),
BadImage => write!(f, "bad image"),
BadIdentifier => write!(f, "an identifier must be at most 100 characters long and contain only ASCII characters in the range 0x20 to 0x7E"),
InvalidName => write!(f, "name is empty or contains control characters"),
BadLib => write!(f, "bad lib"),
UnexpectedDuplicate => write!(f, "unexpected duplicate"),
UnexpectedMove => {
write!(f, "unexpected move point, can only occur at start of contour")
}
UnexpectedSmooth => write!(f, "unexpected smooth attribute on an off-curve point"),
UnexpectedElement => write!(f, "unexpected element"),
UnexpectedAttribute => write!(f, "unexpected attribute"),
UnexpectedEof => write!(f, "unexpected EOF"),
UnexpectedPointAfterOffCurve => {
write!(f, "an off-curve point must be followed by a curve or qcurve")
}
TooManyOffCurves => write!(f, "at most two off-curve points can precede a curve"),
PenPathNotStarted => {
write!(f, "must call begin_path() before calling add_point() or end_path()")
}
TrailingOffCurves => write!(f, "open contours must not have trailing off-curves"),
DuplicateIdentifier => write!(f, "duplicate identifier"),
UnexpectedDrawing => write!(f, "unexpected drawing without an outline"),
UnfinishedDrawing => write!(f, "unfinished drawing, you must call end_path"),
UnexpectedPointField => write!(f, "unexpected point field"),
UnexpectedComponentField => write!(f, "unexpected component field"),
UnexpectedAnchorField => write!(f, "unexpected anchor field"),
UnexpectedGuidelineField => write!(f, "unexpected guideline field"),
UnexpectedImageField => write!(f, "unexpected image field"),
DuplicateElement(s) => write!(f, "there must be only one '{}' element", s),
UnexpectedV1Element(s) => write!(f, "unexpected element in a format 1 glif: {}", s),
UnexpectedV1Attribute(s) => write!(f, "unexpected attribute in a format 1 glif: {}", s),
ComponentEmptyBase => write!(f, "a 'component' element has an empty 'base' attribute"),
ComponentMissingBase => {
write!(f, "a 'component' element is missing a 'base' attribute")
}
LibMustBeDictionary => write!(f, "the glyph lib must be a dictionary"),
BadAngle => write!(f, "an angle must be between 0 and 360°"),
}
}
}
#[doc(hidden)]
impl From<ErrorKind> for GlifLoadError {
fn from(src: ErrorKind) -> Self {
Self::Parse(src)
}
}
#[doc(hidden)]
impl From<IoError> for StoreError {
fn from(src: IoError) -> StoreError {
StoreError::Io(std::sync::Arc::new(src))
}
}