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Copy pathtokenizer.go
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209 lines (195 loc) · 4.79 KB
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package lexer
import (
// . "miniSQL/src/types"
"regexp"
"strconv"
)
const (
LEFT_PARENTHESIS_TOKEN = int('(')
RIGHT_PARENTHESIS_TOKEN = int(')')
COMMA_TOKEN = int(',')
SEMICOLON_TOKEN = int(';')
EQUAL_TOKEN = int('=')
ANGLE_LEFT_TOKEN = int('<')
ANGLE_RIGHT_TOKEN = int('>')
ASTERISK_TOKEN = int('*')
POINT_TOKEN = int('.')
)
var keywords = map[string]int{
"CREATE": CREATE,
"create": CREATE,
"DROP": DROP,
"drop": DROP,
"use": USE,
"USE": USE,
"DATABASE": DATABASE,
"database": DATABASE,
"TABLE": TABLE,
"table": TABLE,
"INDEX": INDEX,
"index": INDEX,
"PRIMARY": PRIMARY,
"primary": PRIMARY,
"KEY": KEY,
"key": KEY,
"ASC": ASC,
"asc": ASC,
"DESC": DESC,
"desc": DESC,
"IN": IN,
"in": IN,
"NOT": NOT,
"not": NOT,
"AND": AND,
"and": AND,
"or": OR,
"OR": OR,
"STORING": STORING,
"storing": STORING,
"INTERLEAVE": INTERLEAVE,
"interleave": INTERLEAVE,
"NULL": NULL,
"null": NULL,
"ON": ON,
"on": ON,
"CASCADE": CASCADE,
"cascade": CASCADE,
"NO": NO,
"no": NO,
"ACTION": ACTION,
"MAX": MAX,
"max": MAX,
"UNIQUE": UNIQUE,
"unique": UNIQUE,
"ADD": ADD,
"add": ADD,
"COLUMN": COLUMN,
"column": COLUMN,
"SET": SET,
"set": SET,
"TRUE": TRUE,
"true": TRUE,
"FALSE": FALSE,
"false": FALSE,
"allow_commit_timestamp": allow_commit_timestamp,
"BOOL": BOOL,
"bool": BOOL,
"INT64": INT64,
"INT": INT64,
"int": INT64,
"FLOAT64": FLOAT64,
"float64": FLOAT64,
"FLOAT": FLOAT64,
"float": FLOAT64,
"BYTES": BYTES,
"bytes": BYTES,
"char": BYTES,
"CHAR": BYTES,
"DATE": DATE,
"date": DATE,
"TIMESTAMP": TIMESTAMP,
"timestamp": TIMESTAMP,
"database_id": database_id,
"decimal_value": decimal_value,
"hex_value": hex_value,
"table_name": table_name,
"column_name": column_name,
"index_name": index_name,
"insert": INSERT,
"INSERT": INSERT,
"INTO": INTO,
"into": INTO,
"UPDATE": UPDATE,
"update": UPDATE,
"DELETE": DELETE,
"delete": DELETE,
"SELECT": SELECT,
"select": SELECT,
"WHERE": WHERE,
"where": WHERE,
"VALUES": VALUES,
"values": VALUES,
"FROM": FROM,
"from": FROM,
"LIMIT": LIMIT,
"limit": LIMIT,
"OFFSET": OFFSET,
"offset": OFFSET,
"execfile": EXECFILE,
"EXECFILE": EXECFILE,
}
var symbols = map[string]int{
"(": LEFT_PARENTHESIS_TOKEN,
")": RIGHT_PARENTHESIS_TOKEN,
",": COMMA_TOKEN,
";": SEMICOLON_TOKEN,
"=": EQUAL_TOKEN,
"<": ANGLE_LEFT_TOKEN,
">": ANGLE_RIGHT_TOKEN,
"*": ASTERISK_TOKEN,
"<>": NE,
"<=": LE,
">=": GE,
".": POINT_TOKEN,
}
var (
databaseIdRegexp = regexp.MustCompile(`[a-zA-Z0-9][a-z0-9_\-]*[a-z0-9]*`)
nameAttrRegexp = regexp.MustCompile(`[a-zA-Z][a-zA-Z0-9_]*`)
)
type keywordTokenizer struct{}
func NewTokenizer() *keywordTokenizer {
return &keywordTokenizer{}
}
// FromStrLit tokenize lit to a token pre-defined by goyacc with last token as a hint.
// TODO Check some literals satisfy regexp specs.
func (kt *keywordTokenizer) FromStrLit(lit string, TokenType Token, lastToken int) int {
tokVal := 0
switch TokenType {
case T_IDENT:
if v, ok := keywords[lit]; ok {
tokVal = v
} else {
switch lastToken {
case DATABASE:
if databaseIdRegexp.MatchString(lit) {
tokVal = database_id
}
case TABLE, INTO, UPDATE, ON:
if nameAttrRegexp.MatchString(lit) {
tokVal = table_name
}
case INDEX:
if nameAttrRegexp.MatchString(lit) {
tokVal = index_name
}
}
if tokVal == 0 {
if nameAttrRegexp.MatchString(lit) {
tokVal = IDENT_LEGAL
} else {
tokVal = IDENT
}
}
}
case T_INTEGER:
if _, err := strconv.ParseInt(lit, 10, 0); err == nil {
tokVal = decimal_value
} else if len(lit) >= 3 && lit[:2] == "0x" {
if _, err := strconv.ParseInt(lit[2:], 16, 0); err == nil {
tokVal = hex_value
}
}
case T_FLOAT:
if _, err := strconv.ParseFloat(lit, 0); err == nil {
//fmt.Println(i)
tokVal = float_value
}
case T_STRING:
tokVal = string_value
default:
if v, ok := symbols[lit]; ok {
tokVal = v
}
}
return tokVal
}