3 * A scanner for EMP-style numeric ranges
4 * contrib/cube/cubescan.l
10 * NB: include cubeparse.h only AFTER defining YYSTYPE (to match cubeparse.y)
11 * and cubedata.h for NDBOX.
14 #define YYSTYPE char *
15 #include "cubeparse.h"
21 /* No reason to constrain amount of data slurped */
22 #define YY_READ_BUF_SIZE 16777216
24 /* Avoid exit() on fatal scanner errors (a bit ugly -- see yy_fatal_error) */
26 #define fprintf(file, fmt, msg) fprintf_to_ereport(fmt, msg)
29 fprintf_to_ereport(const char *fmt, const char *msg)
31 ereport(ERROR, (errmsg_internal("%s", msg)));
34 /* Handles to the buffer that the lexer uses internally */
35 static YY_BUFFER_STATE scanbufhandle;
40 %option never-interactive
46 %option prefix="cube_yy"
51 real [+-]?({n}\.{n}?|\.{n})
52 float ({integer}|{real})([eE]{integer})?
53 infinity [+-]?[iI][nN][fF]([iI][nN][iI][tT][yY])?
58 {float} cube_yylval = yytext; return CUBEFLOAT;
59 {infinity} cube_yylval = yytext; return CUBEFLOAT;
60 {NaN} cube_yylval = yytext; return CUBEFLOAT;
61 \[ cube_yylval = "("; return O_BRACKET;
62 \] cube_yylval = ")"; return C_BRACKET;
63 \( cube_yylval = "("; return O_PAREN;
64 \) cube_yylval = ")"; return C_PAREN;
65 \, cube_yylval = ","; return COMMA;
66 [ \t\n\r\f\v]+ /* discard spaces */
67 . return yytext[0]; /* alert parser of the garbage */
73 /* result and scanbuflen are not used, but Bison expects this signature */
75 cube_yyerror(NDBOX **result, Size scanbuflen,
76 struct Node *escontext,
79 if (*yytext == YY_END_OF_BUFFER_CHAR)
82 (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
83 errmsg("invalid input syntax for cube"),
84 /* translator: %s is typically "syntax error" */
85 errdetail("%s at end of input", message)));
90 (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
91 errmsg("invalid input syntax for cube"),
92 /* translator: first %s is typically "syntax error" */
93 errdetail("%s at or near \"%s\"", message, yytext)));
99 * Called before any actual parsing is done
102 cube_scanner_init(const char *str, Size *scanbuflen)
104 Size slen = strlen(str);
107 * Might be left over after ereport()
109 if (YY_CURRENT_BUFFER)
110 yy_delete_buffer(YY_CURRENT_BUFFER);
113 * Make a scan buffer with special termination needed by flex.
116 scanbuf = palloc(slen + 2);
117 memcpy(scanbuf, str, slen);
118 scanbuf[slen] = scanbuf[slen + 1] = YY_END_OF_BUFFER_CHAR;
119 scanbufhandle = yy_scan_buffer(scanbuf, slen + 2);
126 * Called after parsing is done to clean up after cube_scanner_init()
129 cube_scanner_finish(void)
131 yy_delete_buffer(scanbufhandle);