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use crate::error::{FontLoadingError, SelectionError};
use crate::family_handle::FamilyHandle;
use crate::family_name::FamilyName;
use crate::font::Font;
use crate::handle::Handle;
use crate::properties::Properties;
use crate::source::Source;
use std::any::Any;
#[allow(missing_debug_implementations)]
pub struct MemSource {
families: Vec<FamilyEntry>,
}
impl MemSource {
pub fn empty() -> MemSource {
MemSource { families: vec![] }
}
pub fn from_fonts<I>(fonts: I) -> Result<MemSource, FontLoadingError>
where
I: Iterator<Item = Handle>,
{
let mut families = vec![];
for handle in fonts {
add_font(handle, &mut families)?;
}
families.sort_by(|a, b| a.family_name.cmp(&b.family_name));
Ok(MemSource { families })
}
pub fn add_font(&mut self, handle: Handle) -> Result<Font, FontLoadingError> {
let font = add_font(handle, &mut self.families)?;
self.families
.sort_by(|a, b| a.family_name.cmp(&b.family_name));
Ok(font)
}
pub fn add_fonts(
&mut self,
handles: impl Iterator<Item = Handle>,
) -> Result<(), FontLoadingError> {
for handle in handles {
add_font(handle, &mut self.families)?;
}
self.families
.sort_by(|a, b| a.family_name.cmp(&b.family_name));
Ok(())
}
pub fn all_fonts(&self) -> Result<Vec<Handle>, SelectionError> {
Ok(self
.families
.iter()
.map(|family| family.font.clone())
.collect())
}
pub fn all_families(&self) -> Result<Vec<String>, SelectionError> {
let mut families = vec![];
for family in &self.families {
if families.last() == Some(&family.family_name) {
continue;
}
families.push(family.family_name.clone());
}
Ok(families)
}
pub fn select_family_by_name(&self, family_name: &str) -> Result<FamilyHandle, SelectionError> {
let mut first_family_index = self
.families
.binary_search_by(|family| (&*family.family_name).cmp(family_name))
.map_err(|_| SelectionError::NotFound)?;
while first_family_index > 0
&& self.families[first_family_index - 1].family_name == family_name
{
first_family_index -= 1
}
let mut last_family_index = first_family_index;
while last_family_index + 1 < self.families.len()
&& self.families[last_family_index + 1].family_name == family_name
{
last_family_index += 1
}
let families = &self.families[first_family_index..(last_family_index + 1)];
Ok(FamilyHandle::from_font_handles(
families.iter().map(|family| family.font.clone()),
))
}
pub fn select_by_postscript_name(
&self,
postscript_name: &str,
) -> Result<Handle, SelectionError> {
self.families
.iter()
.filter(|family_entry| family_entry.postscript_name == postscript_name)
.map(|family_entry| family_entry.font.clone())
.next()
.ok_or(SelectionError::NotFound)
}
#[inline]
pub fn select_best_match(
&self,
family_names: &[FamilyName],
properties: &Properties,
) -> Result<Handle, SelectionError> {
<Self as Source>::select_best_match(self, family_names, properties)
}
}
impl Source for MemSource {
#[inline]
fn all_fonts(&self) -> Result<Vec<Handle>, SelectionError> {
self.all_fonts()
}
#[inline]
fn all_families(&self) -> Result<Vec<String>, SelectionError> {
self.all_families()
}
fn select_family_by_name(&self, family_name: &str) -> Result<FamilyHandle, SelectionError> {
self.select_family_by_name(family_name)
}
fn select_by_postscript_name(&self, postscript_name: &str) -> Result<Handle, SelectionError> {
self.select_by_postscript_name(postscript_name)
}
#[inline]
fn as_any(&self) -> &dyn Any {
self
}
#[inline]
fn as_mut_any(&mut self) -> &mut dyn Any {
self
}
}
fn add_font(handle: Handle, families: &mut Vec<FamilyEntry>) -> Result<Font, FontLoadingError> {
let font = Font::from_handle(&handle)?;
if let Some(postscript_name) = font.postscript_name() {
families.push(FamilyEntry {
family_name: font.family_name(),
postscript_name: postscript_name,
font: handle,
})
}
Ok(font)
}
struct FamilyEntry {
family_name: String,
postscript_name: String,
font: Handle,
}