From 1af1d033ab87cadb9bb9107774c21277ffc5b910 Mon Sep 17 00:00:00 2001
From: Runxi Yu <me@runxiyu.org>
Date: Sat, 17 Aug 2024 08:00:00 +0800
Subject: More lexer stuff

---
 yacclex/calc/calc.l       | 22 ----------------------
 yacclex/calclex/calc.l    | 22 ++++++++++++++++++++++
 yacclex/calclexret/calc.l | 39 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 61 insertions(+), 22 deletions(-)
 delete mode 100644 yacclex/calc/calc.l
 create mode 100644 yacclex/calclex/calc.l
 create mode 100644 yacclex/calclexret/calc.l

diff --git a/yacclex/calc/calc.l b/yacclex/calc/calc.l
deleted file mode 100644
index d6c6014..0000000
--- a/yacclex/calc/calc.l
+++ /dev/null
@@ -1,22 +0,0 @@
-%{
-%}
-
-%%
-"+"    { printf("PLUS\n"); }
-"-"    { printf("MINUS\n"); }
-"*"    { printf("TIMES\n"); }
-"/"    { printf("DIVIDE\n"); }
-"|"    { printf("ABS\n"); }
-[0-9]+ { printf("NUMBER %s\n", yytext); }
-\n     { printf("NEWLINE\n"); }
-[ \t]  { }
-.      { printf("Mystery character %s\n", yytext); }
-%%
-
-int main (void) {
-	yylex();
-}
-
-int yywrap() {
-	return 1;
-}
diff --git a/yacclex/calclex/calc.l b/yacclex/calclex/calc.l
new file mode 100644
index 0000000..056980e
--- /dev/null
+++ b/yacclex/calclex/calc.l
@@ -0,0 +1,22 @@
+%{
+%}
+
+%%
+"+"    { printf("PLUS\n");                         }
+"-"    { printf("MINUS\n");                        }
+"*"    { printf("TIMES\n");                        }
+"/"    { printf("DIVIDE\n");                       }
+"|"    { printf("ABS\n");                          }
+[0-9]+ { printf("NUMBER %s\n", yytext);            }
+\n     { printf("NEWLINE\n");                      }
+[ \t]  {                                           }
+.      { printf("Mystery character %s\n", yytext); }
+%%
+
+int main (void) {
+	yylex();
+}
+
+int yywrap() {
+	return 1;
+}
diff --git a/yacclex/calclexret/calc.l b/yacclex/calclexret/calc.l
new file mode 100644
index 0000000..f681fa5
--- /dev/null
+++ b/yacclex/calclexret/calc.l
@@ -0,0 +1,39 @@
+%{
+enum yytokentype {
+	NUMBER = 258,
+	ADD = 259,
+	SUB = 260,
+	MUL = 261,
+	DIV = 262,
+	ABS = 263,
+	EOL = 264
+};
+
+int yylval;
+%}
+
+%%
+"+"    { return ADD;                                }
+"-"    { return SUB;                                }
+"*"    { return MUL;                                }
+"/"    { return DIV;                                }
+"|"    { return ABS;                                }
+[0-9]+ { yylval = atoi(yytext); return NUMBER;      }
+\n     { return EOL;                                }
+[ \t]  { /* ignore whitespace */                    }
+.      { printf("Mystery character %c\n", *yytext); }
+%%
+
+int yywrap() {
+	return 1;
+}
+
+int main(void) {
+	int tok;
+	while((tok = yylex())) {
+		printf("%d", tok);
+		if(tok == NUMBER)
+			printf(" = %d\n", yylval);
+		else printf("\n");
+	}
+}
-- 
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