From be41caa5ca6756c7809cabaf6d8bee321928c45a Mon Sep 17 00:00:00 2001
From: Mike Buland <eichlan@xagasoft.com>
Date: Wed, 21 Feb 2007 09:43:36 +0000
Subject: Added a new key in the lexer that converts any string contained in ``
 to a command and captures the output.  This nicely solves many of my problems
 for now.  Is it a hack?  You be the judge...

---
 src/build.l | 50 +++++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 41 insertions(+), 9 deletions(-)

(limited to 'src')

diff --git a/src/build.l b/src/build.l
index 49275c8..15c4003 100644
--- a/src/build.l
+++ b/src/build.l
@@ -9,6 +9,7 @@ std::string strbuf;
 
 %x strsq
 %x strdq
+%x cmdstr
 %x comment
 %option noyywrap nounput batch debug
 
@@ -78,6 +79,10 @@ std::string strbuf;
 	BEGIN( strsq );
 	strbuf = "";
 }
+\`									{
+	BEGIN( cmdstr );
+	strbuf = "";
+}
 
 <strdq>[^\\\n\"]+					{
 	strbuf += yytext;
@@ -87,15 +92,20 @@ std::string strbuf;
 	strbuf += yytext;
 }
 
-<strdq,strsq>\\n					strbuf += "\n";
-<strdq,strsq>\\t					strbuf += "\t";
-<strdq,strsq>\\r					strbuf += "\r";
-<strdq,strsq>\\b					strbuf += "\b";
-<strdq,strsq>\\f					strbuf += "\f";
-<strdq,strsq>\\\\					strbuf += "\\";
-<strdq,strsq>\\\"					strbuf += "\"";
-<strdq,strsq>\\\'					strbuf += "\'";
-<strdq,strsq>\\.					bld.error( yylloc, "Invalid escape sequence.");
+<cmdstr>[^\\\n\`]+					{
+	strbuf += yytext;
+}
+
+<strdq,strsq,cmdstr>\\n				strbuf += "\n";
+<strdq,strsq,cmdstr>\\t				strbuf += "\t";
+<strdq,strsq,cmdstr>\\r				strbuf += "\r";
+<strdq,strsq,cmdstr>\\b				strbuf += "\b";
+<strdq,strsq,cmdstr>\\f				strbuf += "\f";
+<strdq,strsq,cmdstr>\\\\			strbuf += "\\";
+<strdq,strsq,cmdstr>\\\"			strbuf += "\"";
+<strdq,strsq,cmdstr>\\\'			strbuf += "\'";
+<strdq,strsq,cmdstr>\\\`			strbuf += "`";
+<strdq,strsq,cmdstr>\\.			bld.error( yylloc, "Invalid escape sequence.");
 
 <strdq>\"							{
 	BEGIN( INITIAL );
@@ -109,6 +119,28 @@ std::string strbuf;
 	return STRING;
 }
 
+<cmdstr>\`							{
+	BEGIN( INITIAL );
+	FILE *fpg = popen( strbuf.c_str(), "r" );
+	strbuf = "";
+	for(;;)
+	{
+		char buf[1024];
+		int nRead = fread( buf, 1, 1024, fpg );
+		if( nRead == 0 ) break;
+		for( int j = 0; j < nRead; j++ )
+		{
+			if( buf[j] == '\n' || buf[j] == '\r' )
+				buf[j] = ' ';
+		}
+		strbuf.append( buf, nRead );
+		if( nRead < 1024 ) break;
+	}
+	yylval->strval = stringdup( strbuf.c_str() );
+	pclose( fpg );
+	return STRING;
+}
+
 .									{
 	char buf[] = {"Character x is out of place"};
 	buf[10] = yytext[0];
-- 
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