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use std::path::Path;
use std::collections::BTreeMap;
use std::fmt::Write as FmtWrite;
use std::fmt::Display;
use std::str::FromStr;
use unicode_categories::UnicodeCategories;
use handlebars::Handlebars;
use wasm_inline_js::JsSnippet;
use wasm_js_export::{JsExport, TypeMetadata};
use super::Error;
#[derive(Copy, Clone, PartialEq, Eq, Debug)]
pub enum RuntimeKind {
Standalone,
LibraryEs6,
WebExtension,
OnlyLoader
}
impl FromStr for RuntimeKind {
type Err = Error;
fn from_str(s: &str) -> Result<Self, Self::Err> {
match s {
"standalone" => Ok(RuntimeKind::Standalone),
"library-es6" => Ok(RuntimeKind::LibraryEs6),
"web-extension" => Ok(RuntimeKind::WebExtension),
"experimental-only-loader" => Ok(RuntimeKind::OnlyLoader),
_ => Err(Error::ConfigurationError(format!("{} is not a valid runtime type.", s))),
}
}
}
fn to_js_identifier( string: &str ) -> String {
fn is_valid_starting_char( ch: char ) -> bool {
ch.is_letter_uppercase() ||
ch.is_letter_lowercase() ||
ch.is_letter_titlecase() ||
ch.is_letter_modifier() ||
ch.is_letter_other() ||
ch.is_number_letter()
}
fn replace_invalid_starting_char( ch: char ) -> char {
if is_valid_starting_char( ch ) {
ch
} else {
'_'
}
}
fn is_valid_middle_char( ch: char ) -> bool {
is_valid_starting_char( ch ) ||
ch == '\u{200C}' ||
ch == '\u{200D}' ||
ch.is_mark_nonspacing() ||
ch.is_mark_spacing_combining() ||
ch.is_number_decimal_digit() ||
ch.is_punctuation_connector()
}
fn replace_invalid_middle_char( ch: char ) -> char {
if is_valid_middle_char( ch ) {
ch
} else {
'_'
}
}
string.chars().take( 1 ).map( replace_invalid_starting_char ).chain(
string.chars().skip( 1 ).map( replace_invalid_middle_char )
).collect()
}
static FACTORY_TEMPLATE: &str = include_str!( "wasm_runtime_factory.js" );
static ONLY_LOADER_TEMPLATE: &str = include_str!( "wasm_runtime_only_loader.js" );
static STANDALONE_TEMPLATE: &str = include_str!( "wasm_runtime_standalone.js" );
static LIBRARY_ES6_TEMPLATE: &str = include_str!( "wasm_runtime_library_es6.js" );
static WEB_EXTENSION_TEMPLATE: &str = include_str!( "wasm_runtime_web_extension.js" );
fn join< T: Display, I: IntoIterator< Item = T > >( separator: &str, iter: I ) -> String {
let mut output = String::new();
for (index, item) in iter.into_iter().enumerate() {
if index != 0 {
write!( output, "{}", separator ).unwrap();
}
write!( output, "{}", item ).unwrap();
}
output
}
pub fn generate_js( runtime: RuntimeKind, main_symbol: Option< String >, wasm_path: &Path, prepend_js: &str, snippets: &[JsSnippet], exports: &[JsExport] ) -> String {
let filename = wasm_path.file_name().unwrap().to_str().unwrap();
let module_name = to_js_identifier( wasm_path.file_stem().unwrap().to_str().unwrap() );
let mut snippets_js = String::new();
for snippet in snippets {
write!( snippets_js, " \"{}\": function(", snippet.name ).unwrap();
for nth in 0..snippet.arg_count() {
if nth != 0 {
write!( snippets_js, ", " ).unwrap();
}
write!( snippets_js, "${}", nth ).unwrap();
}
writeln!( snippets_js, ") {{" ).unwrap();
let indent = " ";
let newline_indent = "\n ";
writeln!( snippets_js, "{}{}", indent, snippet.code.trim().replace( "\n", newline_indent ) ).unwrap();
writeln!( snippets_js, " }}," ).unwrap();
}
let mut exports_code = String::new();
for export in exports {
let mut code = String::new();
let arg_names = join( ", ", export.metadata.args.iter().map( |arg| arg.name.as_str() ) );
writeln!( code, "function {}({}) {{", export.metadata.name, arg_names ).unwrap();
let arg_conversions = join( ", ", export.metadata.args.iter().map( |arg| {
match arg.ty {
TypeMetadata::I32 | TypeMetadata::F64 => format!( "{}", arg.name ),
TypeMetadata::Custom { ref conversion_fn, .. } => format!( "{}({})", conversion_fn, arg.name )
}
}));
let call = format!( "Module.instance.exports.{}({})", export.raw_name, arg_conversions );
if let Some( ref result ) = export.metadata.result {
match *result {
TypeMetadata::I32 | TypeMetadata::F64 => {
writeln!( code, " return {};", call ).unwrap();
},
TypeMetadata::Custom { ref conversion_fn, .. } => {
writeln!( code, " return {}({});", conversion_fn, call ).unwrap();
}
}
} else {
writeln!( code, " {};", call ).unwrap();
}
writeln!( code, "}}" ).unwrap();
writeln!( exports_code,
" Module.exports.{} = {};",
export.metadata.name, code
).unwrap();
}
let handlebars = Handlebars::new();
let mut template_data = BTreeMap::new();
template_data.insert( "snippets", snippets_js.trim().to_owned() );
template_data.insert( "exports", exports_code.trim().to_owned() );
template_data.insert( "prepend_js", prepend_js.to_owned() );
if let Some( main_symbol ) = main_symbol {
template_data.insert( "call_main", format!( "Module.instance.exports.{}();", main_symbol ) );
} else {
template_data.insert( "call_main", "".to_owned() );
}
let factory = handlebars.render_template( FACTORY_TEMPLATE, &template_data ).unwrap();
template_data.clear();
template_data.insert( "factory", factory );
template_data.insert( "wasm_filename", filename.to_owned() );
template_data.insert( "module_name", module_name );
match runtime {
RuntimeKind::Standalone => {
handlebars.render_template( STANDALONE_TEMPLATE, &template_data ).unwrap()
},
RuntimeKind::LibraryEs6 => {
handlebars.render_template( LIBRARY_ES6_TEMPLATE, &template_data ).unwrap()
},
RuntimeKind::WebExtension => {
handlebars.render_template( WEB_EXTENSION_TEMPLATE, &template_data ).unwrap()
},
RuntimeKind::OnlyLoader => {
handlebars.render_template( ONLY_LOADER_TEMPLATE, &template_data ).unwrap()
}
}
}