From 003640b43862e66256dd8e21711246d909431d98 Mon Sep 17 00:00:00 2001
From: sanine <sanine.not@pm.me>
Date: Mon, 22 May 2023 13:08:56 -0500
Subject: update grammar

---
 src/parser/grammar.jison | 97 +++++++++++++++++++++++++++++++++++++-----------
 1 file changed, 76 insertions(+), 21 deletions(-)

(limited to 'src/parser/grammar.jison')

diff --git a/src/parser/grammar.jison b/src/parser/grammar.jison
index 4a17d2b..ae8793b 100644
--- a/src/parser/grammar.jison
+++ b/src/parser/grammar.jison
@@ -1,15 +1,18 @@
 %lex
 
+%s comment
+
 %%
 
-";"              { this.pushState('comment'); return "COMMENT"; }
+<<EOF>>          { return "EOF";     }
 <comment>"\n"    { this.popState(); return "NEWLINE";           }
 <comment>.       { /* ignore anything else inside a comment */  }
+";"              { this.pushState('comment'); }
 
-"\n"             { return "NEWLINE";       }
-\s+              { /* ignore whitespace */ }
+[\n]             { console.log("new!"); return "NEWLINE"; }
+\s              { /* ignore whitespace */ }
 
-"MOV"            { return "MOV"; }
+"MOV"            { console.log("mov"); return "MOV"; }
 "ADD"            { return "ADD"; }
 "SUB"            { return "SUB"; }
 "CMP"            { return "CMP"; }
@@ -24,6 +27,7 @@
 "EQU"            { return "EQU"; }
 "END"            { return "END"; }
 ":"              { return ":"; }
+","              { return ","; }
 
 "#"              { return "#"; }
 "@"              { return "@"; }
@@ -41,28 +45,73 @@
 
 /lex
 
-%%
+%left '+' '-'
+%left '*' '/'
+%left UMINUS
 
+%%
 
 program
-	: lines { return $lines; }
+	: lines NEWLINE END coda { yy.start = 0; return $lines; }
+	| lines NEWLINE END label coda { yy.start = yy.getLabel($label); return $lines; }
 	;
 
+coda
+	: newlines EOF
+	| EOF
+	;
+
+newlines
+	: newlines NEWLINE
+	| NEWLINE
+	;
 
 
 lines
-	: lines line { $lines.push($line); $$ = $lines; }
-	| line { $$ = [ $line ]; }
+	: lines line 
+	{ 
+		if ($line !== null) {
+			$lines.push($line);
+		}
+		$$ = $lines;
+	}
+	| line 
+	{
+		if ($line === null) {
+			$$ = [];
+		} else {
+			$$ = [ $line ];
+		}
+	}
 	;
 
 line
-	: op NEWLINE { $$ = $op; }
-	| op EOF     { $$ = $op; }
+	: row NEWLINE { $$ = $row; }
+	| NEWLINE { $$ = null; }
+	;
+
+row
+	: op 
+	{ 
+		yy.pc += 1;
+		$$ = $op; 
+	}
+	| label ":" op
+	{
+		yy.setLabel($label, yy.pc);
+		yy.pc += 1;
+		$$ = $op;
+	}
+	| label EQU e
+	{
+		yy.setLabel($label, $e);
+		$$ = null;
+	}
 	;
 
 
 op
-	: opcode address address
+	: opcode address "," address
 	{ $$ = { opcode: $opcode, a: $address1, b: $address2 }; }
 	;
 
@@ -82,7 +131,7 @@ opcode
 	;
 
 
-address:
+address
 	: address_mode e { $$ = { mode: $1, value: $2 }; }
 	| e              { $$ = { mode: 'direct', value: $1 }; }
 	;
@@ -90,22 +139,28 @@ address:
 
 address_mode
 	: "#" { $$ = 'immediate';    }
-	| "@" { $$ = 'indirect';     } 
+	| "@" { $$ = 'indirect';     }
 	| "<" { $$ = 'predecrement'; }
 	| "$" { $$ = 'direct';       }
 	;
 
+
 e
-	: NUMBER { $$ = Math.floor(Number(yytext)); }
-	| LABEL  {
-		$$ = yy.getLabel(yytext);
-		if ($$ === null) {
-			YYABORT;
-		}
-	}
-	| e '+' e   { $$ = Math.floor($e1 + $e2); }
+	: e '+' e   { $$ = Math.floor($e1 + $e2); }
 	| e '-' e   { $$ = Math.floor($e1 - $e2); }
 	| e '*' e   { $$ = Math.floor($e1 * $e2); }
 	| e '/' e   { $$ = Math.floor($e1 / $e2); }
 	| '(' e ')' { $$ = Math.floor($e); }
+	| '-' e %prec UMINUS { $$ = - $e; }
+	| NUMBER { $$ = Math.floor(Number(yytext)); }
+	| label {
+		$$ = yy.getLabel($label);
+	}
+	;
+
+
+label
+	: LABEL { $$ = yytext; }
 	;
+
+
-- 
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