Source code
Revision control
Copy as Markdown
Other Tools
load(libdir + "match.js");
load(libdir + "asserts.js");
var { Pattern, MatchError } = Match;
program = (elts) => Pattern({
type: "Program",
body: elts
});
expressionStatement = (expression) => Pattern({
type: "ExpressionStatement",
expression: expression
});
assignmentExpression = (left, operator, right) => Pattern({
type: "AssignmentExpression",
operator: operator,
left: left,
right: right
});
ident = (name) => Pattern({
type: "Identifier",
name: name
});
metaProperty = (meta, property) => Pattern({
type: "MetaProperty",
meta: meta,
property: property
});
memberExpression = (object, property) => Pattern({
type: "MemberExpression",
object: object,
property: property
});
function parseAsModule(source)
{
return Reflect.parse(source, {target: "module"});
}
program([
expressionStatement(
metaProperty(
ident("import"),
ident("meta")
)
)
]).assert(parseAsModule("import.meta;"));
program([
expressionStatement(
assignmentExpression(
ident("x"),
"=",
metaProperty(
ident("import"),
ident("meta")
)
)
)
]).assert(parseAsModule("x = import.meta;"));
program([
expressionStatement(
assignmentExpression(
memberExpression(
metaProperty(
ident("import"),
ident("meta")
),
ident("foo")
),
"=",
ident("x"),
)
)
]).assert(parseAsModule("import.meta.foo = x;"));
function assertModuleParseThrowsSyntaxError(source)
{
assertThrowsInstanceOf(() => parseAsModule(source), SyntaxError);
}
assertModuleParseThrowsSyntaxError("import");
assertModuleParseThrowsSyntaxError("import.");
assertModuleParseThrowsSyntaxError("import.met");
assertModuleParseThrowsSyntaxError("import.metaa");
assertModuleParseThrowsSyntaxError("x = import");
assertModuleParseThrowsSyntaxError("x = import.");
assertModuleParseThrowsSyntaxError("x = import.met");
assertModuleParseThrowsSyntaxError("x = import.metaa");
assertModuleParseThrowsSyntaxError("import.meta = x");