1 files changed, 156 insertions, 0 deletions
diff --git a/fitsy++/lex.L b/fitsy++/lex.L
new file mode 100644
index 0000000..2415354
--- /dev/null
+++ b/fitsy++/lex.L
@@ -0,0 +1,156 @@
+/* Copyright (C) 1999-2018
+ * Smithsonian Astrophysical Observatory, Cambridge, MA, USA
+ * For conditions of distribution and use, see copyright notice in "copyright"
+ */
+%option noyywrap
+%option caseless
+%option never-interactive
+%option c++
+
+%{
+  #include <stdio.h>
+  #include <stdlib.h>
+  #include <string.h>
+
+  #include "util.h"
+  #include "parser.H"
+
+  extern YYSTYPE* fflval;
+  extern ffFlexLexer* fflexx;
+
+  extern char ff_filter[];
+  #define RET(x) {strcat(ff_filter,yytext);return x;}
+  #define CLEARFILTER {ff_filter[0]='\0';}
+%}
+
+%x EXT
+%x FILTER
+%x ARRAY
+
+/* rules */
+
+%%
+
+[^[\]\t]+	{ // File
+		  strcpy(fflval->str,yytext);
+		  return STRING;
+		}
+
+\[		{ // first bracket
+		  BEGIN EXT;
+		  CLEARFILTER
+		  return yytext[0];
+		}
+
+[ \t]+		{ // White Spaces
+		} 
+
+.		{ // Else, return the char
+		  return yytext[0];
+		}
+
+<EXT>{
+
+arch		{RET(ARCH_)}
+array		{RET(ARRAY_)}
+big	        {RET(BIG_)}
+bigendian	{RET(BIGENDIAN_)}
+bin		{RET(BIN_)}
+binkey		{RET(BINKEY_)}
+bincol		{RET(BINCOL_)}
+bitpix		{RET(BITPIX_)}
+col		{RET(COL_)}
+dim		{RET(DIM_)}
+dims		{RET(DIMS_)}
+ecliptic	{RET(ECLIPTIC_)}
+endian          {RET(ENDIAN_)}
+equatorial	{RET(EQUATORIAL_)}
+galactic	{RET(GALACTIC_)}
+key		{RET(KEY_)}
+layout		{RET(LAYOUT_)}
+little   	{RET(LITTLE_)}
+littleendian	{RET(LITTLEENDIAN_)}
+nested		{RET(NESTED_)}
+north		{RET(NORTH_)}
+order		{RET(ORDER_)}
+quad		{RET(QUAD_)}
+ring		{RET(RING_)}
+skip		{RET(SKIP_)}
+south		{RET(SOUTH_)}
+system		{RET(SYSTEM_)}
+unknown		{RET(UNKNOWN_)}
+xdim		{RET(XDIM_)}
+ydim		{RET(YDIM_)}
+zdim		{RET(ZDIM_)}
+
+[-+]?[0-9]+	{ // Integer
+		  fflval->integer = atoi(yytext);
+		  RET(INT)
+		}
+
+[0-9A-Za-z_.-]+	{ // Extn/Col Name
+		  strcpy(fflval->str,yytext);
+		  RET(STRING)
+		}
+
+\[		{ // bracket
+		  CLEARFILTER
+		  return yytext[0];
+		}
+
+,		{ // comma
+		  CLEARFILTER
+		  return yytext[0];
+		}
+
+[ \t]+		{ // White Spaces
+		  strcat(ff_filter,yytext); 
+		} 
+
+.		{ // Else, return the char
+		  strcat(ff_filter,yytext); 
+		  return yytext[0];
+		}
+
+}
+
+<FILTER>.*	{  // rest of Filter
+		  strcpy(fflval->str,yytext);
+	          fflval->str[yyleng-1] = '\0'; // Remove the ']'
+		  strcat(ff_filter,fflval->str);
+		  return STRING;
+		}
+
+<ARRAY>{
+
+[-+]?[0-9]+	{ // Integer
+		  fflval->integer = atoi(yytext);
+		  return INT;
+		}
+
+.		{ // Else, return the char
+		  return yytext[0];
+		}
+
+}
+
+%%
+
+void ffFilter(int doit)
+{
+  if (fflexx)
+    fflexx->begin(FILTER, doit);
+}
+
+void ffArray(int doit)
+{
+  if (fflexx)
+    fflexx->begin(ARRAY, doit);
+}
+
+void ffFlexLexer::begin(int which, int doit)
+{
+  BEGIN which;
+  if (doit)
+    yyless(0);
+}