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verify.dart
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verify.dart
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part of '../../combinator.dart';
class Verify<I, O> extends ParserBuilder<I, O> {
static const _template = '''
final {{pos}} = state.pos;
{{var1}}
{{p1}}
if (state.ok) {
final v = {{val1}};
state.ok = {{verify}};
if (state.ok) {
{{res0}} = v;
} else {
state.fail(state.pos, ParseError.message, {{message}}, {{pos}}, state.pos);
state.pos = {{pos}};
}
}''';
static const _templateFast = '''
final {{pos}} = state.pos;
{{var1}}
{{p1}}
if (state.ok) {
final v = {{val1}};
state.ok = {{verify}};
if (!state.ok) {
state.fail(state.pos, ParseError.message, {{message}}, {{pos}}, state.pos);
state.pos = {{pos}};
}
}''';
final String message;
final ParserBuilder<I, O> parser;
final SemanticAction<bool> verify;
const Verify(this.message, this.parser, this.verify);
@override
String build(Context context, ParserResult? result) {
final fast = result == null;
final values = context.allocateLocals(['pos']);
final r1 = context.getResult(parser, true);
values.addAll({
'message': helper.escapeString(message),
'p1': parser.build(context, r1),
'verify': verify.build(context, 'verify', ['v']),
});
return render2(fast, _templateFast, _template, values, [result, r1]);
}
}