* stringToNode - * builds a Node tree from its string representation (assumed valid) * * restore_loc_fields instructs readfuncs.c whether to restore location * fields rather than set them to -1. This is currently only supported * in builds with the WRITE_READ_PARSE_PLAN_TREES debugging flag set. */
| 70 | * in builds with the WRITE_READ_PARSE_PLAN_TREES debugging flag set. |
| 71 | */ |
| 72 | static void * |
| 73 | stringToNodeInternal(const char *str, bool restore_loc_fields) |
| 74 | { |
| 75 | void *retval; |
| 76 | const char *save_strtok; |
| 77 | const char *save_begin = pg_strtok_begin; |
| 78 | #ifdef WRITE_READ_PARSE_PLAN_TREES |
| 79 | bool save_restore_location_fields; |
| 80 | #endif |
| 81 | |
| 82 | /* |
| 83 | * We save and restore the pre-existing state of pg_strtok. This makes the |
| 84 | * world safe for re-entrant invocation of stringToNode, without incurring |
| 85 | * a lot of notational overhead by having to pass the next-character |
| 86 | * pointer around through all the readfuncs.c code. |
| 87 | */ |
| 88 | save_strtok = pg_strtok_ptr; |
| 89 | |
| 90 | pg_strtok_ptr = str; /* point pg_strtok at the string to read */ |
| 91 | pg_strtok_begin = str; /* CDB: save starting position for debug */ |
| 92 | |
| 93 | /* |
| 94 | * If enabled, likewise save/restore the location field handling flag. |
| 95 | */ |
| 96 | #ifdef WRITE_READ_PARSE_PLAN_TREES |
| 97 | save_restore_location_fields = restore_location_fields; |
| 98 | restore_location_fields = restore_loc_fields; |
| 99 | #endif |
| 100 | |
| 101 | retval = nodeRead(NULL, 0); /* do the reading */ |
| 102 | |
| 103 | pg_strtok_ptr = save_strtok; |
| 104 | pg_strtok_begin = save_begin; |
| 105 | |
| 106 | #ifdef WRITE_READ_PARSE_PLAN_TREES |
| 107 | restore_location_fields = save_restore_location_fields; |
| 108 | #endif |
| 109 | |
| 110 | return retval; |
| 111 | } |
| 112 | |
| 113 | /* |
| 114 | * Externally visible entry points |
no test coverage detected