From e35d7b64dc82864b88e7fe8041e1efd69aed144a Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Wed, 5 Jul 2023 21:12:54 +0100
Subject: Parse positive ints

---
 src/main/java/org/shedlang/compiler/parser/Parser.java    | 15 +++++++++++++++
 src/main/java/org/shedlang/compiler/parser/TokenType.java |  1 +
 src/main/java/org/shedlang/compiler/parser/Tokeniser.java |  1 +
 3 files changed, 17 insertions(+)

(limited to 'src/main/java')

diff --git a/src/main/java/org/shedlang/compiler/parser/Parser.java b/src/main/java/org/shedlang/compiler/parser/Parser.java
index 7dd47250..69d02075 100644
--- a/src/main/java/org/shedlang/compiler/parser/Parser.java
+++ b/src/main/java/org/shedlang/compiler/parser/Parser.java
@@ -6,6 +6,7 @@ import org.shedlang.compiler.tokeniser.TokenIterator;
 import org.shedlang.compiler.tokeniser.UnexpectedTokenException;
 import org.shedlang.compiler.types.NamespaceName;
 
+import java.math.BigInteger;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Optional;
@@ -133,6 +134,18 @@ public class Parser {
         };
     }
 
+    private static UntypedExpressionNode parseInt(TokenIterator<TokenType> tokens) {
+        var start = tokens.position();
+
+        var string = tokens.nextValue(TokenType.INT);
+        var value = new BigInteger(string);
+
+        var end = tokens.position();
+        var source = start.to(end);
+
+        return new UntypedIntLiteralNode(value, source);
+    }
+
     private static <T> List<T> parseMany(
         BooleanSupplier stop,
         Supplier<T> parseOne,
@@ -177,6 +190,8 @@ public class Parser {
         return switch (tokens.peek().tokenType()) {
 
             case IDENTIFIER -> parseReference(tokens);
+            
+            case INT -> parseInt(tokens);
 
             case STRING -> parseStringLiteral(tokens);
 
diff --git a/src/main/java/org/shedlang/compiler/parser/TokenType.java b/src/main/java/org/shedlang/compiler/parser/TokenType.java
index 734fbf8e..744bf2aa 100644
--- a/src/main/java/org/shedlang/compiler/parser/TokenType.java
+++ b/src/main/java/org/shedlang/compiler/parser/TokenType.java
@@ -3,6 +3,7 @@ package org.shedlang.compiler.parser;
 public enum TokenType {
     END,
     IDENTIFIER,
+    INT,
     STRING,
     UNKNOWN,
     WHITESPACE,
diff --git a/src/main/java/org/shedlang/compiler/parser/Tokeniser.java b/src/main/java/org/shedlang/compiler/parser/Tokeniser.java
index 31b30ef8..6e5b3f2f 100644
--- a/src/main/java/org/shedlang/compiler/parser/Tokeniser.java
+++ b/src/main/java/org/shedlang/compiler/parser/Tokeniser.java
@@ -33,6 +33,7 @@ public class Tokeniser {
             RegexTokeniser.rule(TokenType.SYMBOL_SEMICOLON, ";"),
 
             RegexTokeniser.rule(TokenType.IDENTIFIER, "[A-Za-z][A-Za-z0-9]*"),
+            RegexTokeniser.rule(TokenType.INT, "[0-9]+"),
             RegexTokeniser.rule(TokenType.STRING, "\"(?:[^\\\\\"\n\r]|\\\\.)*\""),
             RegexTokeniser.rule(TokenType.WHITESPACE, "[\r\n\t ]+")
         )
-- 
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