Added very basic flex files for raster MapAlgebra implementation. The file

'ma_lexer_only' is for testing only the lexer, without the parser


git-svn-id: http://svn.osgeo.org/postgis/trunk@6424 b70326c6-7e19-0410-871a-916f4a2858ee

raster/ma_lexer.l

@@ -0,0 +1,61 @@
+%{
+
+/* MapAlgebra lexer */
+#include <stdio.h>
+#include <stdlib.h>
+#include "ma_parser.tab.h"
+
+int nlines = 0;
+
+%}
+
+DIGIT [0-9]
+ID [a-zA-Z][a-zA-Z0-9_]*
+
+%%
+
+{DIGIT}+("."{DIGIT}+)?  {//printf("Found TKN_REAL: %d\n", atoi(yytext));
+                        yylval.real = atof(yytext);
+                        return TKN_REAL;}
+"="                 {//printf("Found TKN_ASSIGN: %s\n",yytext);
+                    return TKN_ASSIGN;}
+";"                 {//printf("Found TKN_SEMICOLON: %s\n",yytext);
+                    return TKN_SEMICOLON;}
+"*"                 {//printf("Found TKN_PROD: %s\n",yytext);
+                    return TKN_PROD;}
+"/"                 {//printf("Found TKN_DIV: %s\n",yytext);
+                    return TKN_DIV;}
+"+"                 {//printf("Found TKN_PLUS: %s\n",yytext);
+                    return TKN_PLUS;}
+"-"                 {//printf("Found TKN_MINUS: %s\n",yytext);}
+                    return TKN_MINUS;
+"("                 {//printf("Found TKN_LFT_PAR: %s\n",yytext);
+                    return TKN_LFT_PAR;}
+")"                 {//printf("Found TKN_RGT_PAR: %s\n",yytext);
+                    return TKN_RGT_PAR;}
+"cos"               {//printf("Found TKN_COS: %s\n",yytext);
+                    return TKN_COS;}
+"sin"               {//printf("Found TKN_SIN: %s\n",yytext);
+                    return TKN_SIN;}
+"\n"                {nlines++;}
+{ID}                {//printf("Found TKN_ID: %s\n", yytext);
+                    return TKN_ID;}
+. 
+
+%%
+
+void main(int argc, char **argv)
+{
+    if (argc > 1)
+        yyin = fopen(argv[1], "rt");
+    else
+        yyin = stdin;
+    yylex();
+    printf("%d lines analyzed\n", nlines);
+}
+
+
+/* To compile:
+   flex ma_lexer.l
+   gcc lex.yy.c -o ma_lexer -lfl -lm
+   */

raster/ma_lexer_only.l

@@ -0,0 +1,47 @@
+%{
+
+/* MapAlgebra lexer */
+#include <stdio.h>
+#include <stdlib.h>
+
+int nlines = 0;
+
+%}
+
+DIGIT [0-9]
+ID [a-zA-Z][a-zA-Z0-9_]*
+
+%%
+
+{DIGIT}+            {printf("Found TKN_INTEGER: %d\n", atoi(yytext));}
+{DIGIT}+"."{DIGIT}+ {printf("Found TKN_REAL: %d\n", atoi(yytext));}
+"="                 {printf("Found TKN_ASSIGN: %s\n",yytext);}
+";"                 {printf("Found TKN_SEMICOLON: %s\n",yytext);}
+"*"                 {printf("Found TKN_PROD: %s\n",yytext);}
+"/"                 {printf("Found TKN_DIV: %s\n",yytext);}
+"+"                 {printf("Found TKN_PLUS: %s\n",yytext);}
+"-"                 {printf("Found TKN_MINUS: %s\n",yytext);}
+"("                 {printf("Found TKN_LFT_PAR: %s\n",yytext);}
+")"                 {printf("Found TKN_RGT_PAR: %s\n",yytext);}
+"cos"               {printf("Found TKN_COS: %s\n",yytext);}
+"sin"               {printf("Found TKN_SIN: %s\n",yytext);}
+"\n"                {nlines++;}
+{ID}                {printf("Found TKN_ID: %s\n", yytext);}
+. 
+
+%%
+
+void main(int argc, char **argv)
+{
+    if (argc > 1)
+        yyin = fopen(argv[1], "rt");
+    else
+        yyin = stdin;
+    yylex();
+    printf("%d lines analyzed\n", nlines);
+}
+
+/* To compile:
+   flex ma_lexer_only.l
+   gcc lex.yy.c -o ma_lexer_only -lfl -lm
+   */