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keyword.go
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keyword.go
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package tengo
import (
"strings"
"sync"
)
// The functions in this file currently only manage reserved words (a subset of
// keywords). In the future, it may be expanded to include additional functions
// which operate on all keywords, which may be useful in improving the parser,
// as well as for solving issues like #175 and #199.
// This constant is used for determining map capacity for reserved word maps.
// This is padded slightly; currently MySQL 8 has 262 keywords, vs 249 in recent
// MariaDB releases.
const countReservedWordsPerFlavor = 265
var (
keywordMutex sync.Mutex
reservedWordsByFlavor map[Flavor]map[string]bool // lazily created per flavor
)
// ReservedWordMap returns a map which can be used for looking up whether a
// given word is a reserved word in the supplied flavor. Keys in the map are all
// lowercase. If called repeatedly on the same flavor, a reference to the same
// underlying map will be returned each time. The caller should not modify this
// map.
// The returned map is only designed to be accurate in common situations, and
// does not necessarily account for changes in specific point releases
// (especially pre-GA ones), special sql_mode values like MariaDB's ORACLE
// mode support, or flavors that this package does not support.
func ReservedWordMap(flavor Flavor) map[string]bool {
if reservedWordsByFlavor != nil {
if rwm := reservedWordsByFlavor[flavor]; rwm != nil {
return rwm
}
}
keywordMutex.Lock()
defer keywordMutex.Unlock()
if reservedWordsByFlavor == nil {
reservedWordsByFlavor = make(map[Flavor]map[string]bool)
}
rwm := make(map[string]bool, countReservedWordsPerFlavor)
// Add all keywords that are present in both MySQL 5.5 and MariaDB 10.1, which
// are the oldest flavors that this package supports.
for _, word := range commonReservedWords {
rwm[word] = true
}
// Now add in flavor-specific keywords
for word, flavors := range reservedWordsAddedInFlavor {
for _, flavorAddedIn := range flavors {
if flavor.Min(flavorAddedIn) {
rwm[word] = true
break
}
}
}
reservedWordsByFlavor[flavor] = rwm
return rwm
}
// VendorReservedWordMap returns a map containing all reserved words in any
// version of the supplied vendor.
// For additional documentation on the returned map, see ReservedWordMap.
func VendorReservedWordMap(vendor Vendor) map[string]bool {
flavor := Flavor{Vendor: vendor, Version: Version{65535, 65535, 65535}}
return ReservedWordMap(flavor)
}
// IsReservedWord returns true if word is a reserved word in flavor, or false
// otherwise. This result is only designed to be accurate in common situations,
// and does not necessarily account for changes in specific point releases
// (especially pre-GA ones), special sql_mode values like MariaDB's ORACLE
// mode support, or flavors that this package does not support.
func IsReservedWord(word string, flavor Flavor) bool {
reservedWordMap := ReservedWordMap(flavor)
return reservedWordMap[strings.ToLower(word)]
}
// IsVendorReservedWord returns true if word is a reserved word in ANY version
// of vendor, or false otherwise.
func IsVendorReservedWord(word string, vendor Vendor) bool {
reservedWordMap := VendorReservedWordMap(vendor)
return reservedWordMap[strings.ToLower(word)]
}
// Below this point are unexported variables containing keyword lists. If adding
// new keywords to these variables, be sure to only use lowercase!
// These reserved words are present in both MySQL 5.5 and MariaDB 10.1, which
// are the oldest flavors this package supports. This list should not ever
// change, unless it is found to contain mistakes.
var commonReservedWords = []string{
"accessible",
"add",
"all",
"alter",
"analyze",
"and",
"as",
"asc",
"asensitive",
"before",
"between",
"bigint",
"binary",
"blob",
"both",
"by",
"call",
"cascade",
"case",
"change",
"char",
"character",
"check",
"collate",
"column",
"condition",
"constraint",
"continue",
"convert",
"create",
"cross",
"current_date",
"current_time",
"current_timestamp",
"current_user",
"cursor",
"database",
"databases",
"day_hour",
"day_microsecond",
"day_minute",
"day_second",
"dec",
"decimal",
"declare",
"default",
"delayed",
"delete",
"desc",
"describe",
"deterministic",
"distinct",
"distinctrow",
"div",
"double",
"drop",
"dual",
"each",
"else",
"elseif",
"enclosed",
"escaped",
"exists",
"exit",
"explain",
"false",
"fetch",
"float",
"float4",
"float8",
"for",
"force",
"foreign",
"from",
"fulltext",
"grant",
"group",
"having",
"high_priority",
"hour_microsecond",
"hour_minute",
"hour_second",
"if",
"ignore",
"in",
"index",
"infile",
"inner",
"inout",
"insensitive",
"insert",
"int",
"int1",
"int2",
"int3",
"int4",
"int8",
"integer",
"interval",
"into",
"is",
"iterate",
"join",
"key",
"keys",
"kill",
"leading",
"leave",
"left",
"like",
"limit",
"linear",
"lines",
"load",
"localtime",
"localtimestamp",
"lock",
"long",
"longblob",
"longtext",
"loop",
"low_priority",
"master_ssl_verify_server_cert",
"match",
"maxvalue",
"mediumblob",
"mediumint",
"mediumtext",
"middleint",
"minute_microsecond",
"minute_second",
"mod",
"modifies",
"natural",
"not",
"no_write_to_binlog",
"null",
"numeric",
"on",
"optimize",
"option",
"optionally",
"or",
"order",
"out",
"outer",
"outfile",
"precision",
"primary",
"procedure",
"purge",
"range",
"read",
"reads",
"read_write",
"real",
"references",
"regexp",
"release",
"rename",
"repeat",
"replace",
"require",
"resignal",
"restrict",
"return",
"revoke",
"right",
"rlike",
"schema",
"schemas",
"second_microsecond",
"select",
"sensitive",
"separator",
"set",
"show",
"signal",
"smallint",
"spatial",
"specific",
"sql",
"sqlexception",
"sqlstate",
"sqlwarning",
"sql_big_result",
"sql_calc_found_rows",
"sql_small_result",
"ssl",
"starting",
"straight_join",
"table",
"terminated",
"then",
"tinyblob",
"tinyint",
"tinytext",
"to",
"trailing",
"trigger",
"true",
"undo",
"union",
"unique",
"unlock",
"unsigned",
"update",
"usage",
"use",
"using",
"utc_date",
"utc_time",
"utc_timestamp",
"values",
"varbinary",
"varchar",
"varcharacter",
"varying",
"when",
"where",
"while",
"with",
"write",
"xor",
"year_month",
"zerofill",
}
// Mapping of lowercased reserved words to the flavor(s) that added them. A
// few notes on keeping this list manageable:
// - We currently do not track point (aka dot or patch) releases here. It's
// possible this policy may change to better handle MySQL 8, but so far the
// only edge case in the past few years is "intersect" (reserved in 8.0.31+).
// - Some of the entries associated with FlavorMariaDB101 were actually
// introduced prior to that, but this package does not support pre-10.1,
// so 10.1 is used as a placeholder for simplicity's sake. A few other entries
// are inconsistently documented by the MariaDB manual, so 10.1 is used as a
// guess for: "delete_domain_id", "page_checksum", "parse_vcol_expr", and
// "position".
// - We don't yet track anything specific to a Variant (e.g. Percona Server).
// - Some situational cases are omitted, for example "window" is a MariaDB
// reserved word only in the context of table name *aliases*, which largely
// means it isn't relevant to this package at this time.
var reservedWordsAddedInFlavor = map[string][]Flavor{
"get": {FlavorMySQL56},
"io_after_gtids": {FlavorMySQL56},
"io_before_gtids": {FlavorMySQL56},
"master_bind": {FlavorMySQL56},
"partition": {FlavorMySQL56, FlavorMariaDB101},
"generated": {FlavorMySQL57},
"optimizer_costs": {FlavorMySQL57},
"stored": {FlavorMySQL57},
"virtual": {FlavorMySQL57},
"cube": {FlavorMySQL80},
"cume_dist": {FlavorMySQL80},
"dense_rank": {FlavorMySQL80},
"empty": {FlavorMySQL80},
"except": {FlavorMySQL80, FlavorMariaDB103},
"first_value": {FlavorMySQL80},
"function": {FlavorMySQL80},
"grouping": {FlavorMySQL80},
"groups": {FlavorMySQL80},
"intersect": {FlavorMySQL80, FlavorMariaDB103},
"json_table": {FlavorMySQL80},
"lag": {FlavorMySQL80},
"last_value": {FlavorMySQL80},
"lateral": {FlavorMySQL80},
"lead": {FlavorMySQL80},
"nth_value": {FlavorMySQL80},
"ntile": {FlavorMySQL80},
"of": {FlavorMySQL80},
"over": {FlavorMySQL80, FlavorMariaDB102},
"percent_rank": {FlavorMySQL80},
"rank": {FlavorMySQL80},
"recursive": {FlavorMySQL80, FlavorMariaDB102},
"row": {FlavorMySQL80},
"rows": {FlavorMySQL80, FlavorMariaDB102},
"row_number": {FlavorMySQL80},
"system": {FlavorMySQL80},
"window": {FlavorMySQL80}, // see comment above re: MariaDB
"current_role": {FlavorMariaDB101},
"delete_domain_id": {FlavorMariaDB101}, // actual version unclear from docs, see comment above
"do_domain_ids": {FlavorMariaDB101},
"general": {FlavorMariaDB101},
"ignore_domain_ids": {FlavorMariaDB101},
"ignore_server_ids": {FlavorMariaDB101},
"master_heartbeat_period": {FlavorMariaDB101},
"page_checksum": {FlavorMariaDB101}, // actual version unclear from docs, see comment above
"parse_vcol_expr": {FlavorMariaDB101}, // actual version unclear from docs, see comment above
"position": {FlavorMariaDB101}, // actual version unclear from docs, see comment above
"ref_system_id": {FlavorMariaDB101},
"returning": {FlavorMariaDB101},
"slow": {FlavorMariaDB101},
"stats_auto_recalc": {FlavorMariaDB101},
"stats_persistent": {FlavorMariaDB101},
"stats_sample_pages": {FlavorMariaDB101},
"offset": {FlavorMariaDB106},
}