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Allow for different kinds of imports

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This commit is contained in:
Yoshi Askharoun
2024-01-30 22:44:48 -06:00
parent 810a6badac
commit 199d2263e6
2 changed files with 49 additions and 13 deletions
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libs/UIX.Asm/Lexer.cs
+45 -10
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@@ -12,13 +12,7 @@ public static class Lexer
public static readonly Parser<string> StatementEnd = Parse.Char(';').Return(";").Or(Parse.LineTerminator);
public static readonly Parser<Import> Import =
from _ in Parse.String(".import").Token()
from uri in Uri.Token()
from __ in Parse.String("as").Token()
from name in AlphanumericText
from end in StatementEnd
select new Import(uri, name);
public static readonly Parser<IImport> Import = ParseImport;
public static readonly Parser<IBodyItem> BodyItem = ParseBodyItem;
@@ -29,8 +23,7 @@ public static class Lexer
private static IResult<IBodyItem> ParseBodyItem(IInput input)
{
var trimWhitespaceResult = Parse.WhiteSpace.Many()(input);
input = trimWhitespaceResult.Remainder;
input = ConsumeWhitespace(input);
var identifierResult = Parse.Letter.AtLeastOnce().Text().Invoke(input);
if (!identifierResult.WasSuccessful)
@@ -54,7 +47,7 @@ public static class Lexer
if (!endOfInstructionResult.WasSuccessful)
{
input = Parse.WhiteSpace.Many()(input).Remainder;
input = ConsumeWhitespace(input);
var operandsResult = Parse.Ref(() => AlphanumericText).DelimitedBy(Parse.Char(',').Token())(input);
operands.AddRange(operandsResult.Value.Select(s => new Operand(s)));
@@ -66,4 +59,46 @@ public static class Lexer
return Result.Success(bodyItem, input);
}
private static IResult<IImport> ParseImport(IInput input)
{
input = ConsumeWhitespace(input);
var importDirectiveResult = Parse.String(".import-")(input);
input = importDirectiveResult.Remainder;
if (!importDirectiveResult.WasSuccessful)
return Result.Failure<IImport>(input, "Invalid import directive", null);
var importTypeResult = Parse.Letter.AtLeastOnce().Text()(input);
input = importTypeResult.Remainder;
if (!importTypeResult.WasSuccessful)
return Result.Failure<IImport>(input, "Invalid import type", null);
IImport import;
switch (importTypeResult.Value.ToUpperInvariant())
{
case "NS":
var uriResult = Uri.Token()(input);
input = uriResult.Remainder;
if (!uriResult.WasSuccessful)
return Result.Failure<IImport>(input, "Invalid URI", null);
input = Parse.String("as").Token()(input).Remainder;
var nameResult = AlphanumericText(input);
input = nameResult.Remainder;
if (!nameResult.WasSuccessful)
return Result.Failure<IImport>(input, "Invalid namespace alias", null);
import = new NamespaceImport(uriResult.Value, nameResult.Value);
break;
default:
return Result.Failure<IImport>(input, $"Unknown import type '{importTypeResult.Value}'", null);
}
return Result.Success(import, input);
}
private static IInput ConsumeWhitespace(IInput input) => Parse.WhiteSpace.Many()(input).Remainder;
}