From e95498f8e547b42233dfa2e1e756cac88ac4c5b9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Cl=C3=A9ment=20Zrounba?=
 <6691770+clement-z@users.noreply.github.com>
Date: Fri, 3 Nov 2023 15:04:06 +0100
Subject: improve handling of multiple files

---
 src/main.cpp        | 15 +++++++++++++++
 src/parser/parser.l | 15 +++++++++++----
 2 files changed, 26 insertions(+), 4 deletions(-)

diff --git a/src/main.cpp b/src/main.cpp
index 08cef21..e850e34 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -27,6 +27,7 @@ using namespace literals;
 #include "../build/parser/parser.yy.h"
 extern int yydebug;
 int yywrap(yyscan_t scanner);
+extern "C" int yy_delete_buffer(yyscan_t scanner);
 
 static deque<YY_BUFFER_STATE> netlist_buf_fifo;
 
@@ -42,13 +43,22 @@ FILE* open_netlist_file(const string &filename, yyscan_t &scanner)
         exit(1);
     }
 
+    string header = "\n**** START of " + filename + " ****\n";
+    netlist_buf_fifo.push_back(yy_scan_string(header.c_str(), scanner));
+
     YY_BUFFER_STATE buf = yy_create_buffer(f, YY_BUF_SIZE, scanner);
     netlist_buf_fifo.push_back(buf);
+
+    string footer = "\n**** END of " + filename + " ****\n";
+    netlist_buf_fifo.push_back(yy_scan_string(footer.c_str(), scanner));
+
     return f;
 }
 
 int yywrap(yyscan_t scanner)
 {
+    static YY_BUFFER_STATE *last_buffer = NULL;
+
     if (netlist_buf_fifo.empty())
         return 1;
     else
@@ -56,6 +66,11 @@ int yywrap(yyscan_t scanner)
         YY_BUFFER_STATE buf = netlist_buf_fifo.front();
         netlist_buf_fifo.pop_front();
         yy_switch_to_buffer(buf, scanner);
+        if ( last_buffer )
+        {
+            yy_delete_buffer( *last_buffer, scanner);
+            last_buffer = &buf;
+        }
         return 0;
     }
 }
diff --git a/src/parser/parser.l b/src/parser/parser.l
index 7c33630..3edda2f 100644
--- a/src/parser/parser.l
+++ b/src/parser/parser.l
@@ -93,6 +93,13 @@ static T from_string(const string &str)
 
 %%  /*** Rules section ***/
 
+^.*{EOL} {
+    // print the netlist as it is read
+    // note: doesnt handle included files
+    if(false)
+        cout << yytext; REJECT;
+}
+
 ^\.include  {yy_push_state(INCLUDE, yyscanner);}
 <INCLUDE>{WS}*      /* eat the whitespace */
 <INCLUDE>[^ ;\t\n\r]+   { /* got the include file name */
@@ -383,12 +390,12 @@ static T from_string(const string &str)
 <INITIAL,INCLUDE><<EOF>> {
     yypop_buffer_state(yyscanner);
 
-        if ( !YY_CURRENT_BUFFER )
-        {
+    if ( !YY_CURRENT_BUFFER )
+    {
         yyterminate();
-        }
-        return '\n';
     }
+    return '\n';
+}
 
 <SUBCKT_DECLARATION,IN_DQUOTES><<EOF>> {
     exit(yylerror(yyscanner, "Unexpected end of file."));
-- 
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