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pgsp_json.c
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/*-------------------------------------------------------------------------
*
* pgsp_json.c: Plan handler for JSON/XML/YAML style plans
*
* Copyright (c) 2008-2025, PostgreSQL Global Development Group
* Copyright (c) 2012-2025, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
*
* IDENTIFICATION
* pg_store_plans/pgsp_json.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#if PG_VERSION_NUM >= 130000
#include "mb/pg_wchar.h"
#endif
#include "miscadmin.h"
#include "nodes/nodes.h"
#include "nodes/parsenodes.h"
#include "nodes/bitmapset.h"
#include "parser/scanner.h"
#include "utils/xml.h"
#include "utils/json.h"
#if PG_VERSION_NUM < 130000
#include "utils/jsonapi.h"
#else
#include "common/jsonapi.h"
#endif
#include "pgsp_json.h"
#include "pgsp_json_int.h"
#if PG_VERSION_NUM < 160000
#include "parser/gram.h"
#define JsonParseErrorType void
#define JSONACTION_RETURN_SUCCESS() return
#else
/* In PG16, include/scan.h was gone. Define required symbols manually.. */
/* must be in sync with src/backend/parser/gram.h */
#include "pgsp_token_types.h"
#define JSONACTION_RETURN_SUCCESS() return JSON_SUCCESS
#endif
#define INDENT_STEP 2
void normalize_expr(char *expr, bool preserve_space);
static const char *converter_core(word_table *tbl,
const char *src, pgsp_parser_mode mode);
static JsonParseErrorType json_objstart(void *state);
static JsonParseErrorType json_objend(void *state);
static JsonParseErrorType json_arrstart(void *state);
static JsonParseErrorType json_arrend(void *state);
static JsonParseErrorType json_ofstart(void *state, char *fname, bool isnull);
static JsonParseErrorType json_aestart(void *state, bool isnull);
static JsonParseErrorType json_scalar(void *state, char *token,
JsonTokenType tokentype);
static JsonParseErrorType yaml_objstart(void *state);
static JsonParseErrorType yaml_objend(void *state);
static JsonParseErrorType yaml_arrstart(void *state);
static JsonParseErrorType yaml_arrend(void *state);
static JsonParseErrorType yaml_ofstart(void *state, char *fname, bool isnull);
static JsonParseErrorType yaml_aestart(void *state, bool isnull);
static JsonParseErrorType yaml_scalar(void *state, char *token,
JsonTokenType tokentype);
static void adjust_wbuf(pgspParserContext *ctx, int len);
static char *hyphenate_words(pgspParserContext *ctx, char *src);
static JsonParseErrorType xml_objstart(void *state);
static JsonParseErrorType xml_objend(void *state);
static JsonParseErrorType xml_arrend(void *state);
static JsonParseErrorType xml_ofstart(void *state, char *fname, bool isnull);
static JsonParseErrorType xml_ofend(void *state, char *fname, bool isnull);
static JsonParseErrorType xml_aestart(void *state, bool isnull);
static JsonParseErrorType xml_aeend(void *state, bool isnull);
static JsonParseErrorType xml_scalar(void *state, char *token,
JsonTokenType tokentype) ;
static void init_json_semaction(JsonSemAction *sem,
pgspParserContext *ctx);
word_table propfields[] =
{
{P_NodeType, "t" ,"Node Type", NULL, true, conv_nodetype, SETTER(node_type)},
{P_RelationShip, "h" ,"Parent Relationship", NULL, true, conv_relasionship, NULL},
{P_RelationName, "n" ,"Relation Name", NULL, true, NULL, SETTER(obj_name)},
{P_FunctioName, "f" ,"Function Name", NULL, true, NULL, SETTER(obj_name)},
{P_IndexName, "i" ,"Index Name", NULL, true, NULL, SETTER(index_name)},
{P_CTEName, "c" ,"CTE Name", NULL, true, NULL, SETTER(obj_name)},
{P_TrgRelation, "w" ,"Relation", NULL, true, NULL, SETTER(trig_relation)},
{P_Schema, "s" ,"Schema", NULL, true, NULL, SETTER(schema_name)},
{P_Alias, "a" ,"Alias", NULL, true, NULL, SETTER(alias)},
{P_Output, "o" ,"Output", NULL, true, conv_expression, SETTER(output)},
{P_ScanDir, "d" ,"Scan Direction", NULL, true, conv_scandir, SETTER(scan_dir)},
{P_MergeCond, "m" ,"Merge Cond", NULL, true, conv_expression, SETTER(merge_cond)},
{P_Strategy, "g" ,"Strategy", NULL, true, conv_strategy, SETTER(strategy)},
{P_JoinType, "j" ,"Join Type", NULL, true, conv_jointype, SETTER(join_type)},
{P_SortMethod, "e" ,"Sort Method", NULL, true, conv_sortmethod, SETTER(sort_method)},
{P_SortKey, "k" ,"Sort Key", NULL, true, conv_expression, SETTER(sort_key)},
{P_Filter, "5" ,"Filter", NULL, true, conv_expression, SETTER(filter)},
{P_JoinFilter, "6" ,"Join Filter", NULL, true, conv_expression, SETTER(join_filter)},
{P_HashCond, "7" ,"Hash Cond", NULL, true, conv_expression, SETTER(hash_cond)},
{P_IndexCond, "8" ,"Index Cond", NULL, true, conv_expression, SETTER(index_cond)},
{P_TidCond, "9" ,"TID Cond", NULL, true, conv_expression, SETTER(tid_cond)},
{P_RecheckCond, "0" ,"Recheck Cond", NULL, true, conv_expression, SETTER(recheck_cond)},
{P_Operation, "!" ,"Operation", NULL, true, conv_operation, SETTER(operation)},
{P_SubplanName, "q" ,"Subplan Name", NULL, true, NULL, SETTER(subplan_name)},
{P_Command, "b" ,"Command", NULL, true, conv_setsetopcommand,SETTER(setopcommand)},
{P_Triggers, "r" ,"Triggers", NULL, true, NULL, NULL},
{P_Trigger, "u" ,"Trigger", NULL, true, NULL, SETTER(node_type)},
{P_TriggerName, "v" ,"Trigger Name", NULL, true, NULL, SETTER(trig_name)},
{P_ConstraintName, "x" ,"Constraint Name", NULL, true, NULL, NULL},
{P_Plans, "l" ,"Plans", NULL, true, NULL, NULL},
{P_Plan, "p" ,"Plan", NULL, true, NULL, NULL},
{P_GroupKey, "-" ,"Group Key", NULL, true, NULL, SETTER(group_key)},
{P_GroupSets, "=" ,"Grouping Sets", NULL, true, NULL, NULL},
{P_GroupKeys, "\\" ,"Group Keys", NULL, true, NULL, SETTER(group_key)},
{P_HashKeys, "~" ,"Hash Keys", NULL, true, NULL, SETTER(hash_key)},
{P_HashKey, "|" ,"Hash Key", NULL, true, NULL, SETTER(hash_key)},
{P_Parallel, "`" ,"Parallel Aware", NULL, true, NULL, SETTER(parallel_aware)},
{P_PartialMode, ">" ,"Partial Mode", NULL, true, conv_partialmode,SETTER(partial_mode)},
{P_WorkersPlanned, "{" ,"Workers Planned", NULL, true, NULL, SETTER(workers_planned)},
{P_WorkersLaunched, "}" ,"Workers Launched", NULL, true, NULL, SETTER(workers_launched)},
{P_InnerUnique, "?" ,"Inner Unique", NULL, true, NULL, SETTER(inner_unique)},
{P_AsyncCapable, "ac", "Async Capable", NULL, true, NULL, SETTER(async_capable)},
/* Values of these properties are ignored on normalization */
{P_FunctionCall, "y" ,"Function Call", NULL, false, NULL, SETTER(func_call)},
{P_StartupCost, "1" ,"Startup Cost", NULL, false, NULL, SETTER(startup_cost)},
{P_TotalCost, "2" ,"Total Cost", NULL, false, NULL, SETTER(total_cost)},
{P_PlanRows, "3" ,"Plan Rows", NULL, false, NULL, SETTER(plan_rows)},
{P_PlanWidth, "4" ,"Plan Width", NULL, false, NULL, SETTER(plan_width)},
{P_ActualStartupTime,"A","Actual Startup Time", NULL, false, NULL, SETTER(actual_startup_time)},
{P_ActualTotalTime, "B" ,"Actual Total Time", NULL, false, NULL, SETTER(actual_total_time)},
{P_ActualRows, "C" ,"Actual Rows", NULL, false, NULL, SETTER(actual_rows)},
{P_ActualLoops, "D" ,"Actual Loops", NULL, false, NULL, SETTER(actual_loops)},
{P_HeapFetches, "E" ,"Heap Fetches", NULL, false, NULL, SETTER(heap_fetches)},
{P_SharedHitBlks, "F" ,"Shared Hit Blocks", NULL, false, NULL, SETTER(shared_hit_blks)},
{P_SharedReadBlks, "G" ,"Shared Read Blocks", NULL, false, NULL, SETTER(shared_read_blks)},
{P_SharedDirtiedBlks,"H","Shared Dirtied Blocks",NULL,false, NULL, SETTER(shared_dirtied_blks)},
{P_SharedWrittenBlks,"I","Shared Written Blocks",NULL,false, NULL, SETTER(shared_written_blks)},
{P_LocalHitBlks, "J" ,"Local Hit Blocks", NULL, false, NULL, SETTER(local_hit_blks)},
{P_LocalReadBlks, "K" ,"Local Read Blocks", NULL, false, NULL, SETTER(local_read_blks)},
{P_LocalDirtiedBlks,"L" ,"Local Dirtied Blocks",NULL, false, NULL, SETTER(local_dirtied_blks)},
{P_LocalWrittenBlks,"M" ,"Local Written Blocks",NULL, false, NULL, SETTER(local_written_blks)},
{P_TempReadBlks, "N" ,"Temp Read Blocks", NULL, false, NULL, SETTER(temp_read_blks)},
{P_TempWrittenBlks, "O" ,"Temp Written Blocks", NULL, false, NULL, SETTER(temp_written_blks)},
{P_IOReadTime, "P" ,"I/O Read Time", NULL, false, NULL, SETTER(io_read_time)},
{P_IOWwriteTime, "Q" ,"I/O Write Time", NULL, false, NULL, SETTER(io_write_time)},
{P_SortSpaceUsed, "R" ,"Sort Space Used", NULL, false, NULL, SETTER(sort_space_used)},
{P_SortSpaceType, "S" ,"Sort Space Type", NULL, false, conv_sortspacetype,SETTER(sort_space_type)},
{P_PeakMemoryUsage, "T" ,"Peak Memory Usage", NULL, false, NULL, SETTER(peak_memory_usage)},
{P_OrgHashBatches, "U","Original Hash Batches",NULL, false, NULL, SETTER(org_hash_batches)},
{P_OrgHashBuckets, "*","Original Hash Buckets",NULL, false, NULL, SETTER(org_hash_buckets)},
{P_HashBatches, "V" ,"Hash Batches", NULL, false, NULL, SETTER(hash_batches)},
{P_HashBuckets, "W" ,"Hash Buckets", NULL, false, NULL, SETTER(hash_buckets)},
{P_RowsFilterRmvd, "X" ,"Rows Removed by Filter",NULL,false,NULL, SETTER(filter_removed)},
{P_RowsIdxRchkRmvd, "Y" ,"Rows Removed by Index Recheck",NULL,false, NULL, SETTER(idxrchk_removed)},
{P_TrgTime, "Z" ,"Time", NULL, false, NULL, SETTER(trig_time)},
{P_TrgCalls, "z" ,"Calls", NULL, false, NULL, SETTER(trig_calls)},
{P_PlanTime, "#" ,"Planning Time", NULL, false, NULL, SETTER(plan_time)},
{P_ExecTime, "$" ,"Execution Time", NULL, false, NULL, SETTER(exec_time)},
{P_ExactHeapBlks, "&" ,"Exact Heap Blocks", NULL, false, NULL, SETTER(exact_heap_blks)},
{P_LossyHeapBlks, "(" ,"Lossy Heap Blocks", NULL, false, NULL, SETTER(lossy_heap_blks)},
{P_RowsJoinFltRemvd,")" ,"Rows Removed by Join Filter", NULL, false, NULL, SETTER(joinfilt_removed)},
{P_TargetTables, "_" ,"Target Tables", NULL, false, NULL, NULL},
{P_ConfRes, "%" ,"Conflict Resolution", NULL, false, NULL, SETTER(conflict_resolution)},
{P_ConfArbitIdx, "@" ,"Conflict Arbiter Indexes",NULL, false, NULL, SETTER(conflict_arbiter_indexes)},
{P_TuplesInserted, "^" ,"Tuples Inserted", NULL, false, NULL, SETTER(tuples_inserted)},
{P_ConfTuples, "+" ,"Conflicting Tuples", NULL, false, NULL, SETTER(conflicting_tuples)},
{P_SamplingMethod, ":" ,"Sampling Method" , NULL, false, NULL, SETTER(sampling_method)},
{P_SamplingParams, ";" ,"Sampling Parameters" , NULL, false, NULL, SETTER(sampling_params)},
{P_RepeatableSeed, "<" ,"Repeatable Seed" , NULL, false, NULL, SETTER(repeatable_seed)},
{P_Workers, "[" ,"Workers", NULL, false, NULL, NULL},
{P_WorkerNumber, "]" ,"Worker Number", NULL, false, NULL, SETTER(worker_number)},
{P_TableFuncName, "aa" ,"Table Function Name",NULL, false, NULL, SETTER(table_func_name)},
{P_PresortedKey, "pk" ,"Presorted Key" ,NULL, false, NULL, SETTER(presorted_key)},
{P_FullsortGroups, "fg" ,"Full-sort Groups" ,NULL, false, NULL, NULL},
{P_SortMethodsUsed, "su" ,"Sort Methods Used" ,NULL, false, NULL, SETTER(sortmethod_used)},
{P_SortSpaceMemory, "sm" ,"Sort Space Memory" ,NULL, false, NULL, SETTER(sortspace_mem)},
{P_GroupCount, "gc" ,"Group Count" ,NULL, false, NULL, SETTER(group_count)},
{P_AvgSortSpcUsed, "as" ,"Average Sort Space Used",NULL, false, NULL, SETTER(avg_sortspc_used)},
{P_PeakSortSpcUsed, "ps" ,"Peak Sort Space Used",NULL, false, NULL, SETTER(peak_sortspc_used)},
{P_PreSortedGroups, "pg" ,"Pre-sorted Groups" ,NULL, false, NULL, NULL},
{P_Invalid, NULL, NULL, NULL, false, NULL, NULL}
};
word_table nodetypes[] =
{
{T_Result, "a" ,"Result", NULL, false, NULL, NULL},
{T_ModifyTable, "b" ,"ModifyTable", NULL, false, NULL, NULL},
{T_Append, "c" ,"Append", NULL, false, NULL, NULL},
{T_MergeAppend, "d" ,"Merge Append", NULL, false, NULL, NULL},
{T_RecursiveUnion,"e" ,"Recursive Union",NULL, false, NULL, NULL},
{T_BitmapAnd, "f" ,"BitmapAnd", NULL, false, NULL, NULL},
{T_BitmapOr, "g" ,"BitmapOr", NULL, false, NULL, NULL},
#if PG_VERSION_NUM < 16
{T_Scan, "" , "", "", false, NULL, NULL},
#endif
{T_SeqScan, "h" ,"Seq Scan", NULL, false, NULL, NULL},
{T_IndexScan, "i" ,"Index Scan", NULL, false, NULL, NULL},
{T_IndexOnlyScan,"j","Index Only Scan",NULL, false, NULL, NULL},
{T_BitmapIndexScan,"k" ,"Bitmap Index Scan", NULL, false, NULL, NULL},
{T_BitmapHeapScan,"l" ,"Bitmap Heap Scan", NULL ,false, NULL, NULL},
{T_TidScan, "m" ,"Tid Scan", NULL, false, NULL, NULL},
{T_SubqueryScan,"n" ,"Subquery Scan", NULL, false, NULL, NULL},
{T_FunctionScan,"o" ,"Function Scan", NULL, false, NULL, NULL},
{T_ValuesScan, "p" ,"Values Scan", NULL, false, NULL, NULL},
{T_CteScan, "q" ,"CTE Scan", NULL, false, NULL, NULL},
{T_WorkTableScan,"r","WorkTable Scan", NULL, false, NULL, NULL},
{T_ForeignScan, "s" , "Foreign Scan", NULL, false, NULL, NULL},
#if PG_VERSION_NUM < 16
{T_Join, "" , "", NULL, false, NULL, NULL},
#endif
{T_NestLoop, "t" ,"Nested Loop", NULL, false, NULL, NULL},
{T_MergeJoin, "u" ,"Merge Join", "Merge", false, NULL, NULL},
{T_HashJoin, "v" ,"Hash Join", "Hash", false, NULL, NULL},
{T_Material, "w" ,"Materialize", NULL, false, NULL, NULL},
{T_Sort, "x" ,"Sort", NULL, false, NULL, NULL},
{T_Group, "y" ,"Group", NULL, false, NULL, NULL},
{T_Agg, "z" ,"Aggregate", NULL, false, NULL, NULL},
{T_WindowAgg, "0" ,"WindowAgg", NULL, false, NULL, NULL},
{T_Unique, "1" ,"Unique", NULL, false, NULL, NULL},
{T_Hash, "2" ,"Hash", NULL, false, NULL, NULL},
{T_SetOp, "3" ,"SetOp", NULL, false, NULL, NULL},
{T_LockRows, "4" ,"LockRows", NULL, false, NULL, NULL},
{T_Limit, "5" ,"Limit", NULL, false, NULL, NULL},
#if PG_VERSION_NUM >= 90500
{T_SampleScan, "B" ,"Sample Scan", NULL, false, NULL, NULL},
#endif
#if PG_VERSION_NUM >= 90600
{T_Gather, "6" ,"Gather", NULL, false, NULL, NULL},
#endif
#if PG_VERSION_NUM >= 100000
{T_ProjectSet, "7" ,"ProjectSet", NULL, false, NULL, NULL},
{T_TableFuncScan,"8","Table Function Scan", NULL, false, NULL, NULL},
{T_NamedTuplestoreScan,"9","Named Tuplestore Scan", NULL, false, NULL, NULL},
{T_GatherMerge, "A" ,"Gather Merge", NULL, false, NULL, NULL},
#endif
#if PG_VERSION_NUM >= 130000
{T_IncrementalSort, "C" ,"Incremental Sort", NULL, false, NULL, NULL},
#endif
#if PG_VERSION_NUM >= 140000
{T_TidRangeScan,"D", "Tid Range Scan", NULL, false, NULL, NULL},
{T_Memoize, "E", "Memoize", NULL, false, NULL, NULL},
#endif
{T_Invalid, NULL, NULL, NULL, false, NULL, NULL}
};
word_table directions[] =
{
{T_Invalid, "b" ,"Backward", "Backward", false, NULL, NULL},
{T_Invalid, "n" ,"NoMovement","", false, NULL, NULL},
{T_Invalid, "f" ,"Forward", "", false, NULL, NULL},
{T_Invalid, NULL , NULL, NULL, false, NULL, NULL}
};
word_table relationships[] =
{
{T_Invalid, "o" ,"Outer", NULL, false, NULL, NULL},
{T_Invalid, "i" ,"Inner", NULL, false, NULL, NULL},
{T_Invalid, "s" ,"Subquery", NULL, false, NULL, NULL},
{T_Invalid, "m" ,"Member", NULL, false, NULL, NULL},
{T_Invalid, "I" ,"InitPlan", NULL, false, NULL, NULL},
{T_Invalid, "S" ,"SubPlan", NULL, false, NULL, NULL},
{T_Invalid, NULL, NULL, NULL, false, NULL, NULL}
};
word_table strategies[] =
{
{S_Plain, "p" ,"Plain", NULL, false, NULL, NULL},
{S_Sorted, "s" ,"Sorted", NULL, false, NULL, NULL},
{S_Hashed, "h" ,"Hashed", NULL, false, NULL, NULL},
{S_Mixed, "m" ,"Mixed", NULL, false, NULL, NULL},
{S_Invalid, NULL, NULL, NULL, false, NULL, NULL}
};
word_table operations[] =
{
{T_Invalid, "i" ,"Insert", NULL, false, NULL, NULL},
{T_Invalid, "d" ,"Delete", NULL, false, NULL, NULL},
{T_Invalid, "u" ,"Update", NULL, false, NULL, NULL},
{T_Invalid, NULL, NULL, NULL, false, NULL, NULL}
};
word_table jointypes[] =
{
{T_Invalid, "i" ,"Inner", NULL, false, NULL, NULL},
{T_Invalid, "l" ,"Left", NULL, false, NULL, NULL},
{T_Invalid, "f" ,"Full", NULL, false, NULL, NULL},
{T_Invalid, "r" ,"Right", NULL, false, NULL, NULL},
{T_Invalid, "s" ,"Semi", NULL, false, NULL, NULL},
{T_Invalid, "a" ,"Anti", NULL, false, NULL, NULL},
{T_Invalid, NULL, NULL, NULL, false, NULL, NULL}
};
word_table setsetopcommands[] =
{
{T_Invalid, "i" ,"Intersect", NULL, false, NULL, NULL},
{T_Invalid, "I" ,"Intersect All", NULL, false, NULL, NULL},
{T_Invalid, "e" ,"Except", NULL, false, NULL, NULL},
{T_Invalid, "E" ,"Except All", NULL, false, NULL, NULL},
{T_Invalid, NULL, NULL, NULL, false, NULL, NULL}
};
word_table sortmethods[] =
{
{T_Invalid, "h" ,"top-N heapsort", NULL, false, NULL, NULL},
{T_Invalid, "q" ,"quicksort", NULL, false, NULL, NULL},
{T_Invalid, "e" ,"external sort", NULL, false, NULL, NULL},
{T_Invalid, "E" ,"external merge", NULL, false, NULL, NULL},
{T_Invalid, "s" ,"still in progress", NULL, false, NULL, NULL},
{T_Invalid, NULL, NULL, NULL, false, NULL, NULL}
};
word_table sortspacetype[] =
{
{T_Invalid, "d" ,"Disk", NULL, false, NULL, NULL},
{T_Invalid, "m" ,"Memory",NULL, false, NULL, NULL},
{T_Invalid, NULL, NULL, NULL, false, NULL, NULL}
};
word_table partialmode[] =
{
{T_Invalid, "p" ,"Partial", NULL, false, NULL, NULL},
{T_Invalid, "f" ,"Finalize",NULL, false, NULL, NULL},
{T_Invalid, "s" ,"Simple",NULL, false, NULL, NULL},
{T_Invalid, NULL, NULL, NULL, false, NULL, NULL}
};
word_table *
search_word_table(word_table *tbl, const char *word, int mode)
{
word_table *p;
bool longname =
(mode == PGSP_JSON_SHORTEN || mode == PGSP_JSON_NORMALIZE);
/*
* Use simple linear search. We can gain too small portion of the whole
* processing time using more 'clever' algorithms like b-tree or tries,
* which won't be worth the additional memory, complexity and
* initialization cost.
*/
for (p = tbl ; p->longname ; p++)
{
if (strcmp(longname ? p->longname: p->shortname, word) == 0)
break;
}
if (p->longname == NULL && mode == PGSP_JSON_TEXTIZE)
{
/* Fallback to long json prop name */
for (p = tbl ; p->longname ; p++)
if (strcmp(p->longname, word) == 0)
break;
}
return (p->longname ? p : NULL);
}
const char *
converter_core(word_table *tbl,
const char *src, pgsp_parser_mode mode)
{
word_table *p;
char *ret;
p = search_word_table(tbl, src, mode);
if (!p) return src;
ret = p->shortname;
switch(mode)
{
case PGSP_JSON_SHORTEN:
case PGSP_JSON_NORMALIZE:
ret = p->shortname;
break;
case PGSP_JSON_INFLATE:
case PGSP_JSON_YAMLIZE:
case PGSP_JSON_XMLIZE:
ret = p->longname;
break;
case PGSP_JSON_TEXTIZE:
if(p->textname)
ret = p->textname;
else
ret = p->longname;
break;
default:
elog(ERROR, "Internal error");
}
return ret;
}
const char *
conv_nodetype(const char *src, pgsp_parser_mode mode)
{
return converter_core(nodetypes, src, mode);
}
const char *
conv_scandir(const char *src, pgsp_parser_mode mode)
{
return converter_core(directions, src, mode);
}
const char *
conv_relasionship(const char *src, pgsp_parser_mode mode)
{
return converter_core(relationships, src, mode);
}
const char *
conv_strategy(const char *src, pgsp_parser_mode mode)
{
return converter_core(strategies, src, mode);
}
/*
* Look for these operator characters in order to decide whether to strip
* whitespaces which are needless from the view of sql syntax in
* normalize_expr(). This must be synced with op_chars in scan.l.
*/
#define OPCHARS "~!@#^&|`?+-*/%<>="
#define IS_WSCHAR(c) ((c) == ' ' || (c) == '\n' || (c) == '\t')
#define IS_CONST(tok) (tok == FCONST || tok == SCONST || tok == BCONST || \
tok == XCONST || tok == ICONST || tok == NULL_P || \
tok == TRUE_P || tok == FALSE_P || \
tok == CURRENT_CATALOG || tok == CURRENT_DATE || \
tok == CURRENT_ROLE || tok == CURRENT_SCHEMA || \
tok == CURRENT_TIME || tok == CURRENT_TIMESTAMP || \
tok == CURRENT_USER || \
tok == LOCALTIME || tok == LOCALTIMESTAMP)
#define IS_INDENTED_ARRAY(v) ((v) == P_GroupKeys || (v) == P_HashKeys)
/*
* norm_yylex: core_yylex with replacing some tokens.
*/
static int
norm_yylex(char *str, core_YYSTYPE *yylval, YYLTYPE *yylloc, core_yyscan_t yyscanner)
{
int tok;
PG_TRY();
{
tok = core_yylex(yylval, yylloc, yyscanner);
}
PG_CATCH();
{
/*
* Error might occur during parsing quoted tokens that chopped
* halfway. Just ignore the rest of this query even if there might
* be other reasons for parsing to fail.
*/
FlushErrorState();
return -1;
}
PG_END_TRY();
/*
* '?' alone is assumed to be an IDENT. If there's a real
* operator '?', this should be confused but there's hardly be.
*/
if (tok == Op && str[*yylloc] == '?' &&
strchr(OPCHARS, str[*yylloc + 1]) == NULL)
tok = SCONST;
/*
* Replace tokens with '=' if the operator is consists of two or
* more opchars only. Assuming that opchars do not compose a token
* with non-opchars, check the first char only is sufficient.
*/
if (tok == Op && strchr(OPCHARS, str[*yylloc]) != NULL)
tok = '=';
return tok;
}
/*
* normalize_expr - Normalize statements or expressions.
*
* Mask constants, strip unnecessary whitespaces and upcase keywords. expr is
* modified in-place (destructively). If readability is more important than
* uniqueness, preserve_space puts one space for one existent whitespace for
* more readability.
*/
/* scanner interface is changed in PG12 */
#if PG_VERSION_NUM < 120000
#define ScanKeywords (*ScanKeywords)
#define ScanKeywordTokens NumScanKeywords
#endif
void
normalize_expr(char *expr, bool preserve_space)
{
core_yyscan_t yyscanner;
core_yy_extra_type yyextra;
core_YYSTYPE yylval;
YYLTYPE yylloc;
YYLTYPE lastloc;
YYLTYPE start;
char *wp;
int tok, lasttok;
wp = expr;
yyscanner = scanner_init(expr,
&yyextra,
&ScanKeywords,
ScanKeywordTokens);
/*
* The warnings about nonstandard escape strings is already emitted in the
* core. Just silence them here.
*/
#if PG_VERSION_NUM >= 90500
yyextra.escape_string_warning = false;
#endif
lasttok = 0;
lastloc = -1;
for (;;)
{
tok = norm_yylex(expr, &yylval, &yylloc, yyscanner);
start = yylloc;
if (lastloc >= 0)
{
int i, i2;
/* Skipping preceding whitespaces */
for(i = lastloc ; i < start && IS_WSCHAR(expr[i]) ; i++);
/* Searching for trailing whitespace */
for(i2 = i; i2 < start && !IS_WSCHAR(expr[i2]) ; i2++);
if (lasttok == IDENT)
{
/* Identifiers are copied in case-sensitive manner. */
memcpy(wp, expr + i, i2 - i);
wp += i2 - i;
}
#if PG_VERSION_NUM >= 100000
/*
* Since PG10 pg_stat_statements doesn't store trailing semicolon
* in the column "query". Normalization is basically useless in the
* version but still usefull to match utility commands so follow
* the behavior change.
*/
else if (lasttok == ';')
{
/* Just do nothing */
}
#endif
else
{
/* Upcase keywords */
char *sp;
for (sp = expr + i ; sp < expr + i2 ; sp++, wp++)
*wp = (*sp >= 'a' && *sp <= 'z' ?
*sp - ('a' - 'A') : *sp);
}
/*
* Because of destructive writing, wp must not go advance the
* reading point.
* Although this function's output does not need any validity as a
* statement or an expression, spaces are added where it should be
* to keep some extent of sanity. If readability is more important
* than uniqueness, preserve_space adds one space for each
* existent whitespace.
*/
if (tok > 0 &&
i2 < start &&
(preserve_space ||
(tok >= IDENT && lasttok >= IDENT &&
!IS_CONST(tok) && !IS_CONST(lasttok))))
*wp++ = ' ';
start = i2;
}
/* Exit on parse error. */
if (tok < 0)
{
*wp = 0;
return;
}
/*
* Negative signs before numbers are tokenized separately. And
* explicit positive signs won't appear in deparsed expressions.
*/
if (tok == '-')
tok = norm_yylex(expr, &yylval, &yylloc, yyscanner);
/* Exit on parse error. */
if (tok < 0)
{
*wp = 0;
return;
}
if (IS_CONST(tok))
{
YYLTYPE end;
tok = norm_yylex(expr, &yylval, &end, yyscanner);
/* Exit on parse error. */
if (tok < 0)
{
*wp = 0;
return;
}
/*
* Negative values may be surrounded with parens by the
* deparser. Mask involving them.
*/
if (lasttok == '(' && tok == ')')
{
wp -= (start - lastloc);
start = lastloc;
end++;
}
while (expr[end - 1] == ' ')
end--;
*wp++ = '?';
yylloc = end;
}
if (tok == 0)
break;
lasttok = tok;
lastloc = yylloc;
}
*wp = 0;
}
const char *
conv_expression(const char *src, pgsp_parser_mode mode)
{
const char *ret = src;
if (mode == PGSP_JSON_NORMALIZE)
{
char *t = pstrdup(src);
normalize_expr(t, true);
ret = (const char *)t;
}
return ret;
}
const char *
conv_operation(const char *src, pgsp_parser_mode mode)
{
return converter_core(operations, src, mode);
}
const char *
conv_jointype(const char *src, pgsp_parser_mode mode)
{
return converter_core(jointypes, src, mode);
}
const char *
conv_setsetopcommand(const char *src, pgsp_parser_mode mode)
{
return converter_core(setsetopcommands, src, mode);
}
const char *
conv_sortmethod(const char *src, pgsp_parser_mode mode)
{
return converter_core(sortmethods, src, mode);
}
const char *
conv_sortspacetype(const char *src, pgsp_parser_mode mode)
{
return converter_core(sortspacetype, src, mode);
}
const char *
conv_partialmode(const char *src, pgsp_parser_mode mode)
{
return converter_core(partialmode, src, mode);
}
/**** Parser callbacks ****/
/* JSON */
static JsonParseErrorType
json_objstart(void *state)
{
pgspParserContext *ctx = (pgspParserContext *)state;
if (ctx->mode == PGSP_JSON_INFLATE)
{
if (!ctx->fname && ctx->dest->len > 0)
{
appendStringInfoChar(ctx->dest, '\n');
appendStringInfoSpaces(ctx->dest, (ctx->level) * INDENT_STEP);
}
ctx->fname = NULL;
}
appendStringInfoChar(ctx->dest, '{');
ctx->level++;
ctx->first = bms_add_member(ctx->first, ctx->level);
if (ctx->mode == PGSP_JSON_INFLATE)
appendStringInfoChar(ctx->dest, '\n');
JSONACTION_RETURN_SUCCESS();
}
static JsonParseErrorType
json_objend(void *state)
{
pgspParserContext *ctx = (pgspParserContext *)state;
if (ctx->mode == PGSP_JSON_INFLATE)
{
if (!bms_is_member(ctx->level, ctx->first))
appendStringInfoChar(ctx->dest, '\n');
appendStringInfoSpaces(ctx->dest, (ctx->level - 1) * INDENT_STEP);
}
appendStringInfoChar(ctx->dest, '}');
ctx->level--;
ctx->last_elem_is_object = true;
ctx->first = bms_del_member(ctx->first, ctx->level);
ctx->fname = NULL;
JSONACTION_RETURN_SUCCESS();
}
static JsonParseErrorType
json_arrstart(void *state)
{
pgspParserContext *ctx = (pgspParserContext *)state;
if (IS_INDENTED_ARRAY(ctx->current_list))
ctx->wlist_level++;
appendStringInfoChar(ctx->dest, '[');
ctx->fname = NULL;
ctx->level++;
ctx->last_elem_is_object = true;
ctx->first = bms_add_member(ctx->first, ctx->level);
JSONACTION_RETURN_SUCCESS();
}
static JsonParseErrorType
json_arrend(void *state)
{
pgspParserContext *ctx = (pgspParserContext *)state;
if (IS_INDENTED_ARRAY(ctx->current_list))
ctx->wlist_level--;
if (ctx->mode == PGSP_JSON_INFLATE &&
(IS_INDENTED_ARRAY(ctx->current_list) ?
ctx->wlist_level == 0 : ctx->last_elem_is_object))
{
appendStringInfoChar(ctx->dest, '\n');
appendStringInfoSpaces(ctx->dest, (ctx->level - 1) * INDENT_STEP);
}
appendStringInfoChar(ctx->dest, ']');
ctx->level--;
JSONACTION_RETURN_SUCCESS();
}
static JsonParseErrorType
json_ofstart(void *state, char *fname, bool isnull)
{
word_table *p;
pgspParserContext *ctx = (pgspParserContext *)state;
char *fn;
ctx->remove = false;
p = search_word_table(propfields, fname, ctx->mode);
if (!p)
{
ereport(DEBUG1,
(errmsg("JSON parser encoutered unknown field name: \"%s\".", fname),
errdetail_log("INPUT: \"%s\"", ctx->org_string)));
}
ctx->remove = (ctx->mode == PGSP_JSON_NORMALIZE &&
(!p || !p->normalize_use));
if (ctx->remove)
JSONACTION_RETURN_SUCCESS();
if (!bms_is_member(ctx->level, ctx->first))
{
appendStringInfoChar(ctx->dest, ',');
if (ctx->mode == PGSP_JSON_INFLATE)
appendStringInfoChar(ctx->dest, '\n');
}
else
ctx->first = bms_del_member(ctx->first, ctx->level);
if (ctx->mode == PGSP_JSON_INFLATE)
appendStringInfoSpaces(ctx->dest, ctx->level * INDENT_STEP);
/*
* We intentionally let some property names not have a short name. Use long
* name for the cases.
*/
if (!p || !p->longname)
fn = fname;
else if (ctx->mode == PGSP_JSON_INFLATE ||
!(p->shortname && p->shortname[0]))
fn = p->longname;
else
fn = p->shortname;
escape_json(ctx->dest, fn);
ctx->fname = fn;
ctx->valconverter = (p ? p->converter : NULL);
appendStringInfoChar(ctx->dest, ':');
if (ctx->mode == PGSP_JSON_INFLATE)
appendStringInfoChar(ctx->dest, ' ');
if (p && IS_INDENTED_ARRAY(p->tag))
{
ctx->current_list = p->tag;
ctx->list_fname = fname;
ctx->wlist_level = 0;
}
JSONACTION_RETURN_SUCCESS();
}
static JsonParseErrorType
json_ofend(void *state, char *fname, bool isnull)
{
pgspParserContext *ctx = (pgspParserContext *)state;
if (ctx->list_fname && strcmp(fname, ctx->list_fname) == 0)
{
ctx->list_fname = NULL;
ctx->current_list = P_Invalid;
}
JSONACTION_RETURN_SUCCESS();
}
static JsonParseErrorType
json_aestart(void *state, bool isnull)
{
pgspParserContext *ctx = (pgspParserContext *)state;
if (ctx->remove)
JSONACTION_RETURN_SUCCESS();
if (IS_INDENTED_ARRAY(ctx->current_list) &&
ctx->wlist_level == 1)
{
if (!bms_is_member(ctx->level, ctx->first))
appendStringInfoChar(ctx->dest, ',');
if (ctx->mode == PGSP_JSON_INFLATE)
{
appendStringInfoChar(ctx->dest, '\n');
appendStringInfoSpaces(ctx->dest, (ctx->level) * INDENT_STEP);
}
}
else
{
if (!bms_is_member(ctx->level, ctx->first))
{
appendStringInfoChar(ctx->dest, ',');
if (ctx->mode == PGSP_JSON_INFLATE &&
!ctx->last_elem_is_object)
appendStringInfoChar(ctx->dest, ' ');
}
}
ctx->first = bms_del_member(ctx->first, ctx->level);
JSONACTION_RETURN_SUCCESS();
}
static JsonParseErrorType
json_scalar(void *state, char *token, JsonTokenType tokentype)
{
pgspParserContext *ctx = (pgspParserContext *)state;
const char *val = token;
if (ctx->remove)
JSONACTION_RETURN_SUCCESS();
if (ctx->valconverter)
val = ctx->valconverter(token, ctx->mode);
if (tokentype == JSON_TOKEN_STRING)
escape_json(ctx->dest, val);
else
appendStringInfoString(ctx->dest, val);
ctx->last_elem_is_object = false;
JSONACTION_RETURN_SUCCESS();
}
/* YAML */
static JsonParseErrorType
yaml_objstart(void *state)
{
pgspParserContext *ctx = (pgspParserContext *)state;
if (ctx->fname)
{
if (ctx->dest->len > 0)
appendStringInfoChar(ctx->dest, '\n');
appendStringInfoSpaces(ctx->dest, (ctx->level - 1) * INDENT_STEP);
appendStringInfoString(ctx->dest, "- ");
appendStringInfoString(ctx->dest, ctx->fname);
appendStringInfoString(ctx->dest, ":\n");
appendStringInfoSpaces(ctx->dest, (ctx->level + 1) * INDENT_STEP);
ctx->fname = NULL;
}
ctx->level++;
ctx->first = bms_add_member(ctx->first, ctx->level);
JSONACTION_RETURN_SUCCESS();
}
static JsonParseErrorType
yaml_objend(void *state)
{
pgspParserContext *ctx = (pgspParserContext *)state;
ctx->level--;
ctx->last_elem_is_object = true;
ctx->first = bms_del_member(ctx->first, ctx->level);
JSONACTION_RETURN_SUCCESS();
}
static JsonParseErrorType
yaml_arrstart(void *state)
{
pgspParserContext *ctx = (pgspParserContext *)state;
if (ctx->fname)
{
appendStringInfoString(ctx->dest, ctx->fname);
appendStringInfoString(ctx->dest, ":");
}
ctx->fname = NULL;
ctx->level++;
ctx->first = bms_add_member(ctx->first, ctx->level);
JSONACTION_RETURN_SUCCESS();
}
static JsonParseErrorType
yaml_arrend(void *state)
{
pgspParserContext *ctx = (pgspParserContext *)state;
ctx->level--;
JSONACTION_RETURN_SUCCESS();
}
static JsonParseErrorType
yaml_ofstart(void *state, char *fname, bool isnull)
{
word_table *p;
pgspParserContext *ctx = (pgspParserContext *)state;
char *s;