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Add a structural bindgen attribute

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This attribute indicates that methods are to be accessed in a structural method
rather than through their class. This should allow direct access to properties
embedded on objects rather than forcing all objects to have a class/prototype.
This commit is contained in:
Alex Crichton
2018-03-22 17:37:27 -07:00
parent 0e1fee5ddd
commit 8830f540a9
6 changed files with 120 additions and 11 deletions
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55
crates/wasm-bindgen-cli-support/src/js.rs
View File

@@ -1,5 +1,6 @@
use std::char;
use std::collections::{HashSet, HashMap};
use std::fmt::Write;
use std::mem;
use shared;
@@ -1432,6 +1433,7 @@ impl<'a, 'b> SubContext<'a, 'b> {
}
}
let nargs = invoc_args.len();
let invoc_args = invoc_args.join(", ");
let function_name = &import.function.name;
let invoc = match import.class {
@@ -1441,19 +1443,50 @@ impl<'a, 'b> SubContext<'a, 'b> {
Some(ref class) if import.method => {
let class = self.import_name(info, class);
let target = if let Some(ref g) = import.getter {
format!(
"Object.getOwnPropertyDescriptor({}.prototype, '{}').get;",
class,
g,
)
if import.structural {
format!("function() {{ return this.{}; }}", g)
} else {
format!(
"Object.getOwnPropertyDescriptor\
({}.prototype, '{}').get;",
class,
g,
)
}
} else if let Some(ref s) = import.setter {
format!(
"Object.getOwnPropertyDescriptor({}.prototype, '{}').set;",
class,
s,
)
if import.structural {
format!("function(y) {{ this.{} = y; }}", s)
} else {
format!(
"Object.getOwnPropertyDescriptor\
({}.prototype, '{}').set;",
class,
s,
)
}
} else {
format!("{}.prototype.{}", class, function_name)
if import.structural {
let mut s = format!("function(");
for i in 0..nargs - 1 {
if i > 0 {
drop(write!(s, ", "));
}
drop(write!(s, "x{}", i));
}
s.push_str(") { return this.");
s.push_str(function_name);
s.push_str("(");
for i in 0..nargs - 1 {
if i > 0 {
drop(write!(s, ", "));
}
drop(write!(s, "x{}", i));
}
s.push_str("); }");
s
} else {
format!("{}.prototype.{}", class, function_name)
}
};
self.cx.globals.push_str(&format!("
const {}_target = {};