1 files changed, 47 insertions, 0 deletions
diff --git a/lex.l b/lex.l
new file mode 100644
index 0000000..2f79474
--- /dev/null
+++ b/lex.l
@@ -0,0 +1,47 @@
+%{
+#include "grammar.tab.h"
+%}
+
+%%
+"+"                     { return OPERATOR_PLUS; }
+"-"                     { return OPERATOR_MINUS; }
+"="                     { return ASSIGN; }
+
+"function"              { return FUNCTION; }
+"if"                    { return IF; }
+"else"                  { return ELSE; }
+"return"                { return RETURN; }
+"const"                 { return CONST; }
+"var"                   { return VAR; }
+
+"("                     { return PARENTHESIS_LEFT; }
+")"                     { return PARENTHESIS_RIGHT; }
+"{"                     { return BRACE_LEFT; }
+"}"                     { return BRACE_RIGHT; }
+"["                     { return BRACKET_LEFT; }
+"]"                     { return BRACKET_RIGHT; }
+
+","                     { return COMMA; }
+
+[0-9]+                  { yylval = atoi(yytext); return NUMBER; }
+[a-zA-Z]+[a-zA-Z0-9]*   { return IDENTIFIER; }
+"//".*                  { return COMMENT; }
+
+\n                      { return END_OF_LINE; }
+[ \t]                   {}
+
+.                       { printf("undefined: %c\n", *yytext); }
+%%
+
+void henshin_lex(int argc, char **argv)
+{
+  int tok;
+
+  while (tok = yylex()) {
+    printf("%d", tok);
+    if (tok == NUMBER) {
+      printf(" = %d", yylval);
+    }
+    printf("\n");
+  }
+}