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Refactor HighlightingAssets::get_syntax to return Result type

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This commit is contained in:
Ethan P 2020-05-15 17:52:33 -07:00 committed by David Peter
parent 9c371ed8a2
commit 5aa20c090b
3 changed files with 54 additions and 28 deletions
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66
src/assets.rs
View File

@ -190,11 +190,15 @@ impl HighlightingAssets {
language: Option<&str>,
input: &mut OpenedInput,
mapping: &SyntaxMapping,
) -> &SyntaxReference {
let syntax = if input.kind.is_theme_preview_file() {
self.syntax_set.find_syntax_by_name("Rust")
) -> Result<&SyntaxReference> {
if input.kind.is_theme_preview_file() {
self.syntax_set
.find_syntax_by_name("Rust")
.ok_or_else(|| ErrorKind::UnknownSyntax("Rust".to_owned()).into())
} else if let Some(language) = language {
self.syntax_set.find_syntax_by_token(language)
self.syntax_set
.find_syntax_by_token(language)
.ok_or_else(|| ErrorKind::UnknownSyntax(language.to_owned()).into())
} else {
let line_syntax = self.get_first_line_syntax(&mut input.reader);
@ -217,24 +221,29 @@ impl HighlightingAssets {
let absolute_path = path.canonicalize().ok().unwrap_or_else(|| path.to_owned());
match mapping.get_syntax_for(absolute_path) {
Some(MappingTarget::MapToUnknown) => line_syntax,
Some(MappingTarget::MapTo(syntax_name)) => {
// TODO: we should probably return an error here if this syntax can not be
// found. Currently, we just fall back to 'plain'.
self.syntax_set.find_syntax_by_name(syntax_name)
}
Some(MappingTarget::MapToUnknown) => line_syntax.ok_or_else(|| {
ErrorKind::UndetectedSyntax(path.to_string_lossy().into()).into()
}),
Some(MappingTarget::MapTo(syntax_name)) => self
.syntax_set
.find_syntax_by_name(syntax_name)
.ok_or_else(|| ErrorKind::UnknownSyntax(syntax_name.to_owned()).into()),
None => {
let file_name = path.file_name().unwrap_or_default();
self.get_extension_syntax(file_name).or(line_syntax)
self.get_extension_syntax(file_name)
.or(line_syntax)
.ok_or_else(|| {
ErrorKind::UndetectedSyntax(path.to_string_lossy().into()).into()
})
}
}
} else {
// If a path wasn't provided, we fall back to the detect first-line syntax.
line_syntax
line_syntax.ok_or_else(|| ErrorKind::UndetectedSyntax("[unknown]".into()).into())
}
};
syntax.unwrap_or_else(|| self.syntax_set.find_syntax_plain_text())
}
}
fn get_extension_syntax(&self, file_name: &OsStr) -> Option<&SyntaxReference> {
@ -299,11 +308,12 @@ mod tests {
let input = Input::ordinary_file(file_path.as_os_str());
let dummy_stdin: &[u8] = &[];
let mut opened_input = input.open(dummy_stdin).unwrap();
let syntax = self
.assets
.get_syntax(None, &mut opened_input, &self.syntax_mapping);
syntax.name.clone()
self.assets
.get_syntax(None, &mut opened_input, &self.syntax_mapping)
.unwrap_or_else(|_| self.assets.syntax_set.find_syntax_plain_text())
.name
.clone()
}
fn syntax_for_file_with_content_os(&self, file_name: &OsStr, first_line: &str) -> String {
@ -312,11 +322,12 @@ mod tests {
.with_name(Some(file_path.as_os_str()));
let dummy_stdin: &[u8] = &[];
let mut opened_input = input.open(dummy_stdin).unwrap();
let syntax = self
.assets
.get_syntax(None, &mut opened_input, &self.syntax_mapping);
syntax.name.clone()
self.assets
.get_syntax(None, &mut opened_input, &self.syntax_mapping)
.unwrap_or_else(|_| self.assets.syntax_set.find_syntax_plain_text())
.name
.clone()
}
fn syntax_for_file_os(&self, file_name: &OsStr) -> String {
@ -335,10 +346,11 @@ mod tests {
let input = Input::stdin().with_name(Some(OsStr::new(file_name)));
let mut opened_input = input.open(content).unwrap();
let syntax = self
.assets
.get_syntax(None, &mut opened_input, &self.syntax_mapping);
syntax.name.clone()
self.assets
.get_syntax(None, &mut opened_input, &self.syntax_mapping)
.unwrap_or_else(|_| self.assets.syntax_set.find_syntax_plain_text())
.name
.clone()
}
fn syntax_is_same_for_inputkinds(&self, file_name: &str, content: &str) -> bool {

11
src/error.rs
View File

@ -10,6 +10,17 @@ error_chain! {
GlobParsingError(::globset::Error);
SerdeYamlError(::serde_yaml::Error);
}
errors {
UndetectedSyntax(input: String) {
description("unable to detect syntax"),
display("unable to detect syntax for {}", input)
}
UnknownSyntax(name: String) {
description("unknown syntax"),
display("unknown syntax: '{}'", name)
}
}
}
pub fn default_error_handler(error: &Error, output: &mut dyn Write) {

5
src/printer.rs
View File

@ -164,7 +164,10 @@ impl<'a> InteractivePrinter<'a> {
None
} else {
// Determine the type of syntax for highlighting
let syntax = assets.get_syntax(config.language, input, &config.syntax_mapping);
let syntax = assets
.get_syntax(config.language, input, &config.syntax_mapping)
.unwrap_or_else(|_| assets.syntax_set.find_syntax_plain_text());
Some(HighlightLines::new(syntax, theme))
};