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use lang:bs:macro;
use lang:bs;
use core:lang;
// Type of the result.
package Value resultType(Value original) {
if (original == Value())
Value(named{Bool});
else
wrapMaybe(original);
}
// Generate a toS function body.
package Function toSFunction(Type type) {
Scope scope = rootScope;
scope.lookup = BSLookup();
BSTreeFn fn(Value(), SStr("toS"), [ValParam(type, "this"), ValParam(named{StrBuf}, "to")], null);
FnBody body(fn, scope);
fn.body = body;
LocalVarAccess me(SrcPos(), body.parameters[0]);
LocalVarAccess to(SrcPos(), body.parameters[1]);
var b = pattern(body) {
${to} << "{\n";
${to}.indent();
${to} << "value: " << ${me}.value << "\n";
${to} << "end: " << ${me}.end << "\n";
${to} << "error: " << ${me}.error << "\n";
${to}.dedent();
${to} << "}";
};
body.add(b);
fn;
}
/**
* Result type from the parsers. Contains information about a parse.
*/
Result : generate(params) {
if (params.count != 1)
return null;
var resType = params[0].asRef(false);
Type t("Result", [resType], TypeFlags:typeClass);
// Data members:
// Parse value, if parse succeeded.
t.add(MemberVar("value", resultType(resType), t));
// Last position successfully parsed.
t.add(MemberVar("end", named{Str:Iter}, t));
// Error message.
t.add(MemberVar("error", named{Maybe<Error>}, t));
// To string function.
t.add(toSFunction(t));
// We know that all of these are default-constructible, so we can generate a default ctor.
t.add(TypeDefaultCtor(t));
t.add(TypeCopyCtor(t));
t.add(TypeAssign(t));
t.add(TypeDeepCopy(t));
t;
}
/**
* Result type from parsers in binary mode.
*/
BinaryResult : generate(params) {
if (params.count != 1)
return null;
var resType = params[0].asRef(false);
Type t("BinaryResult", [resType], TypeFlags:typeClass);
// Data members:
// Parse value, if parse succeeded.
t.add(MemberVar("value", resultType(resType), t));
// Last position parsed successfully.
t.add(MemberVar("end", named{Nat}, t));
// Error message.
t.add(MemberVar("error", named{Maybe<BinaryError>}, t));
// To string function.
t.add(toSFunction(t));
// We know that all of these are default-constructible, so we can generate a default ctor.
t.add(TypeDefaultCtor(t));
t.add(TypeCopyCtor(t));
t.add(TypeAssign(t));
t.add(TypeDeepCopy(t));
t;
}
/**
* Error location for a string parse.
*/
class Error {
// Error message.
Str message;
// Error location.
Str:Iter pos;
// Create.
init(Str message, Str:Iter pos) {
init { message = message; pos = pos; }
}
// To string.
void toS(StrBuf to) {
to << "{\n";
to.indent();
to << "message: " << message << "\n";
to << "pos: " << pos << "\n";
to.dedent();
to << "}";
}
}
/**
* Error location for a binary parse.
*/
class BinaryError {
// Error message.
Str message;
// Error location.
Nat pos;
// Create.
init(Str message, Nat pos) {
init { message = message; pos = pos; }
}
// To string.
void toS(StrBuf to) {
to << "{\n";
to.indent();
to << "message: " << message << "\n";
to << "pos: " << pos << "\n";
to.dedent();
to << "}";
}
}
// Helper to create an appropriate error.
Error createError(Str message, Str:Iter pos) {
Error(message, pos);
}
BinaryError createError(Str message, Nat pos) {
BinaryError(message, pos);
}
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