1 files changed, 50 insertions, 0 deletions

diff --git a/syntax.y b/syntax.y
new file mode 100644
index 0000000..aa0df71
--- /dev/null
+++ b/syntax.y
@@ -0,0 +1,50 @@
+%{
+#include "lex.yy.c"
+#include "cmd.h"
+
+%}
+
+%union {
+    char *str;
+}
+
+%token <str> WORD STRING
+%token NEWLINE CONTINUATION APPEND_OUT REDIRECT_OUT REDIRECT_IN APPEND_OUTPUT_ERR REDIRECT_OUTPUT_ERR PIPE AND OR BACKGROUND HEREDOC UNKNOWN
+
+%%
+
+line:
+    command NEWLINE { printf("Parsed a command.\n"); }
+    | NEWLINE { /* empty line */ }
+    ;
+
+command:
+    part {printf("PART\n"); }
+    | part separator command { printf("COMMAND\n"); }
+    | part REDIRECT_OUT WORD tail { printf("REDIRECT_OUT: %s\n", $3); free($3); }
+    | part REDIRECT_IN WORD tail { printf("REDIRECT_IN: %s\n", $3); free($3); }
+    | part HEREDOC WORD tail { printf("HEREDOC: %s\n", $3); free($3); }
+    | part BACKGROUND { printf("BACKGROUND\n"); }
+    ;
+
+tail:
+    part
+    | part REDIRECT_OUT WORD tail { printf("REDIRECT_OUT: %s\n", $3); free($3); }
+    | part REDIRECT_IN WORD tail { printf("REDIRECT_IN: %s\n", $3); free($3); }
+    | part HEREDOC WORD tail { printf("HEREDOC: %s\n", $3); free($3); }
+    ;
+
+part:
+    part WORD { printf("WORD: %s\n", $2); free($2); }
+    | part STRING { printf("STRING: %s\n", $2); free($2); }
+    | WORD { printf("WORD: %s\n", $1); free($1); }
+    | STRING { printf("STRING: %s\n", $1); free($1); }
+    ;
+
+separator:
+    PIPE { printf("PIPE\n"); }
+    | AND { printf("AND\n"); }
+    | OR { printf("OR\n"); }
+    ;
+
+%%
\ No newline at end of file