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yacc.py
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yacc.py
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import ply.yacc as yacc
import pymysql
import sys
from lex import tokens
def p_start(p):
"""start : statement"""
sql = p[1]
sql = sql.split('\n')
for ret in sql:
if ret != '':
print(ret)
if ret != 'EXIT;':
execute_sql(ret)
else:
close()
def p_statement(p):
"""
statement :
| create_db statement
| show_db statement
| drop_db statement
| use_db statement
| create_tb statement
| show_tb statement
| drop_tb statement
| insert_tb statement
| delete_tb statement
| update_tb statement
| select_tb statement
| exit_db statement
"""
try:
p[0] = p[1] + '\n' + p[2]
except IndexError:
p[0] = ''
return p
def p_create_db(p):
"""create_db : create database id semicolon"""
p[0] = p[1] + ' ' + p[2] + ' ' + p[3] + p[4]
return p
def p_show_db(p):
"""show_db : show databases semicolon"""
p[0] = p[1] + ' ' + p[2] + p[3]
return p
def p_drop_db(p):
"""drop_db : drop database id semicolon"""
p[0] = p[1] + ' ' + p[2] + ' ' + p[3] + p[4]
return p
def p_use_db(p):
"""use_db : use id semicolon"""
p[0] = p[1] + ' ' + p[2] + p[3]
return p
def p_create_tb(p):
"""create_tb : create table id left_paren cols right_paren semicolon"""
p[0] = p[1] + ' ' + p[2] + ' ' + p[3] + p[4] + p[5] + p[6] + p[7]
def p_cols(p):
"""cols : id type col"""
p[0] = p[1] + ' ' + p[2] + p[3]
return p
def p_type(p):
"""
type : int
| char left_paren number right_paren
"""
if p[1] == 'INT':
p[0] = p[1]
else:
p[0] = p[1] + p[2] + p[3] + p[4]
return p
def p_col(p):
"""
col :
| comma id type col
"""
try:
p[0] = p[1]
p[0] += ' ' + p[2] + ' ' + p[3]
try:
p[0] += p[4]
except IndexError:
print('right')
except IndexError:
p[0] = ''
return p
def p_show_tb(p):
"""show_tb : show tables semicolon"""
p[0] = p[1] + ' ' + p[2] + p[3]
return p
def p_drop_tb(p):
"""drop_tb : drop table id semicolon"""
p[0] = p[1] + ' ' + p[2] + ' ' + p[3] + p[4]
return p
def p_insert_tb(p):
"""insert_tb : insert into tb_name values left_paren value_cols right_paren semicolon"""
p[0] = p[1] + ' ' + p[2] + ' ' + p[3] + ' ' + p[4] + ' ' + p[5] + p[6] + p[7] + p[8]
return p
def p_tb_name(p):
"""
tb_name : id
| id left_paren id_cols right_paren
"""
p[0] = p[1]
try:
p[0] += p[2] + p[3] + p[4]
except IndexError:
p[0] += ''
return p
def p_id_cols(p):
"""id_cols : id id_col"""
p[0] = p[1] + p[2]
return p
def p_id_col(p):
"""
id_col :
| comma id id_col
"""
try:
p[0] = p[1] + ' ' + p[2] + p[3]
except IndexError:
p[0] = ''
return p
def p_value_cols(p):
"""
value_cols : string value_col
| number value_col
"""
p[0] = p[1] + p[2]
return p
def p_value_col(p):
"""
value_col :
| comma string value_col
| comma number value_col
"""
try:
p[0] = p[1] + ' ' + p[2] + p[3]
except IndexError:
p[0] = ''
return p
def p_delete_tb(p):
"""delete_tb : delete from id where conditions semicolon"""
p[0] = p[1] + ' ' + p[2] + ' ' + p[3] + ' ' + p[4] + ' ' + p[5] + p[6]
return p
def p_conditions(p):
"""
conditions : condition_col
| left_paren conditions right_paren condition
"""
p[0] = p[1]
try:
p[0] += p[2] + p[3] + p[4]
except IndexError:
p[0] += ''
return p
def p_condition_col(p):
"""
condition_col : id compare id
| id compare number
| id compare string
| number compare id
| number compare string
| string compare id
| string compare string
"""
p[0] = p[1] + ' ' + p[2] + ' ' + p[3]
return p
def p_condition(p):
"""
condition :
| logic left_paren condition_col right_paren condition
"""
try:
p[0] = ' ' + p[1] + ' ' + p[2] + p[3] + p[4] + p[5]
except IndexError:
p[0] = ''
return p
def p_update_tb(p):
"""
update_tb : update id set update_cols semicolon
| update id set update_cols where conditions semicolon
"""
try:
p[0] = p[1] + ' ' + p[2] + ' ' + p[3] + ' ' + p[4] + ' ' + p[5] + ' ' + p[6] + p[7]
except IndexError:
p[0] = p[1] + ' ' + p[2] + ' ' + p[3] + ' ' + p[4] + p[5]
return p
def p_update_cols(p):
"""
update_cols : id compare number update_col
| id compare string update_col
"""
p[0] = p[1] + ' ' + p[2] + ' ' + p[3] + p[4]
if p[2] != '=':
p_error(p)
sys.exit()
return p
def p_update_col(p):
"""
update_col :
| comma id compare number update_col
| comma id compare string update_col
"""
try:
p[0] = p[1] + ' ' + p[2] + ' ' + p[3] + ' ' + p[4] + p[5]
if p[3] != '=':
p_error(p)
sys.exit()
except IndexError:
p[0] = ''
return p
def p_select_tb(p):
"""
select_tb : select all from id_cols semicolon
| select id_cols from id_cols semicolon
| select all from id_cols where conditions semicolon
| select id_cols from id_cols where conditions semicolon
"""
try:
p[0] = p[1] + ' ' + p[2] + ' ' + p[3] + ' ' + p[4] + ' ' + p[5] + ' ' + p[6] + p[7]
except IndexError:
p[0] = p[1] + ' ' + p[2] + ' ' + p[3] + ' ' + p[4] + p[5]
return p
def p_exit_db(p):
"""exit_db : exit semicolon"""
p[0] = p[1] + p[2]
return p
def p_error(p):
if isinstance(p, yacc.YaccProduction):
print("Wrong assignment symbol in '%s'" % p[0])
elif p:
print("Syntax error at '%s'" % p.value)
else:
print("Syntax error at EOF")
def connect_db():
global conn
global cur
conn = pymysql.connect(host='127.0.0.1', user='root', passwd='mysql', db='mysql')
cur = conn.cursor()
def execute_sql(sql):
cur.execute(sql)
for ret in cur:
print(ret)
def close():
cur.close()
conn.close()
sys.exit()
if __name__ == '__main__':
parser = yacc.yacc()
connect_db()
in_type = input("choose where date is from:\n1. file\n2. terminal\ninput: ")
if in_type == '1':
with open("testData.txt", "r") as f:
s = f.read()
parser.parse(s)
elif in_type == '2':
while True:
try:
s = input('SQL > ')
except EOFError:
break
if not s:
continue
parser.parse(s)