From ca8f17077af731cea01234530bf8c528481c7876 Mon Sep 17 00:00:00 2001
From: Oxore <oxore@protonmail.com>
Date: Sat, 4 Jan 2025 22:56:24 +0300
Subject: Initial commit

---
 simple-c/lexer.l | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 simple-c/lexer.l

(limited to 'simple-c/lexer.l')

diff --git a/simple-c/lexer.l b/simple-c/lexer.l
new file mode 100644
index 0000000..be983d1
--- /dev/null
+++ b/simple-c/lexer.l
@@ -0,0 +1,37 @@
+%{
+#include "parser.h"
+#define YY_USER_ACTION yylloc.first_line = yylloc.last_line = yylineno;
+%}
+
+%option noyywrap
+
+DIGIT [0-9]
+
+%%
+
+"-" { return MINUS; }
+"+" { return PLUS; }
+"*" { return MULT; }
+"/" { return DIV; }
+"=" { return EQUAL; }
+"(" { return L_PAREN; }
+")" { return R_PAREN; }
+
+(\.{DIGIT}+)|({DIGIT}+(\.{DIGIT}*)?([eE][+-]?[0-9]+)?) {
+    yylval.dval = atof(yytext);
+    return NUMBER;
+}
+
+[ \t]+ { /* ignore spaces */ }
+
+"\n" { return END; }
+
+. {
+    printf(
+        "Error at line %d: unrecognized symbol \"%s\"\n",
+        yylloc.first_line,
+        yytext);
+    exit(0);
+}
+
+%%
-- 
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