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# Copyright 2008-2015 Takuto Wada
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
class TwoWaySQL::Parser
rule
sql : stmt_list
{
result = RootNode.new( val[0] )
}
stmt_list :
{
result = []
}
| stmt_list stmt
{
result.push val[1]
}
stmt : primary
| if_stmt
| begin_stmt
begin_stmt : BEGIN stmt_list END
{
result = BeginNode.new( val[1] )
}
if_stmt : IF sub_stmt else_stmt END
{
result = IfNode.new( val[0][1], val[1], val[2] )
}
else_stmt : ELSE sub_stmt
{
result = val[1]
}
|
{
result = nil
}
sub_stmt : and_stmt
| or_stmt
| stmt_list
and_stmt : AND stmt_list
{
result = SubStatementNode.new( val[0][1], val[1] )
}
or_stmt : OR stmt_list
{
result = SubStatementNode.new( val[0][1], val[1] )
}
primary : IDENT
{
result = LiteralNode.new( val[0][1] )
}
| STRING_LITERAL
{
result = LiteralNode.new( val[0][1] )
}
| AND
{
result = LiteralNode.new( val[0][1] )
}
| OR
{
result = LiteralNode.new( val[0][1] )
}
| SPACES
{
result = WhiteSpaceNode.new( val[0][1], @preserve_space )
}
| COMMA
{
result = LiteralNode.new( val[0][1] )
}
| LPAREN
{
result = LiteralNode.new( val[0][1] )
}
| RPAREN
{
result = LiteralNode.new( val[0][1] )
}
| QUESTION
{
@num_questions += 1
result = QuestionNode.new( @num_questions )
}
| ACTUAL_COMMENT
{
result = ActualCommentNode.new( val[0][1] , val[0][2] )
}
| bind_var
| embed_var
bind_var : BIND_VARIABLE STRING_LITERAL
{
result = BindVariableNode.new( val[0][1] )
}
| BIND_VARIABLE SPACES STRING_LITERAL
{
result = BindVariableNode.new( val[0][1] )
}
| BIND_VARIABLE IDENT
{
result = BindVariableNode.new( val[0][1] )
}
| BIND_VARIABLE SPACES IDENT
{
result = BindVariableNode.new( val[0][1] )
}
| PAREN_BIND_VARIABLE
{
result = ParenBindVariableNode.new( val[0][1] )
}
embed_var : EMBED_VARIABLE IDENT
{
result = EmbedVariableNode.new( val[0][1] )
}
| EMBED_VARIABLE SPACES IDENT
{
result = EmbedVariableNode.new( val[0][1] )
}
end
---- inner
require 'strscan'
def initialize(opts={})
opts = {
:debug => false,
:preserve_space => true,
:preserve_comment => false
}.merge(opts)
@yydebug = opts[:debug]
@preserve_space = opts[:preserve_space]
@preserve_comment = opts[:preserve_comment]
@num_questions = 0
end
PAREN_EXAMPLE = '\([^\)]+\)'
BEGIN_BIND_VARIABLE = '(\/|\#)\*([^\*]+)\*\1'
BIND_VARIABLE_PATTERN = /\A#{BEGIN_BIND_VARIABLE}\s*/
PAREN_BIND_VARIABLE_PATTERN = /\A#{BEGIN_BIND_VARIABLE}\s*#{PAREN_EXAMPLE}/
EMBED_VARIABLE_PATTERN = /\A(\/|\#)\*\$([^\*]+)\*\1\s*/
CONDITIONAL_PATTERN = /\A(\/|\#)\*(IF)\s+([^\*]+)\s*\*\1/
BEGIN_END_PATTERN = /\A(\/|\#)\*(BEGIN|END)\s*\*\1/
STRING_LITERAL_PATTERN = /\A(\'(?:[^\']+|\'\')*\')/ ## quoted string
SPLIT_TOKEN_PATTERN = /\A(\S+?)(?=\s*(?:(?:\/|\#)\*|-{2,}|\(|\)|\,))/ ## stop on delimiters --,/*,#*,',',(,)
LITERAL_PATTERN = /\A([^;\s]+)/
SPACES_PATTERN = /\A(\s+)/
QUESTION_PATTERN = /\A\?/
COMMA_PATTERN = /\A\,/
LPAREN_PATTERN = /\A\(/
RPAREN_PATTERN = /\A\)/
ACTUAL_COMMENT_PATTERN = /\A(\/|\#)\*(\s{1,}(?:.*?))\*\1/m ## start with spaces
SEMICOLON_AT_INPUT_END_PATTERN = /\A\;\s*\Z/
UNMATCHED_COMMENT_START_PATTERN = /\A(?:(?:\/|\#)\*)/
#TODO: remove trailing spaces for S2Dao compatibility, but this spec sometimes causes SQL bugs...
ELSE_PATTERN = /\A\-{2,}\s*ELSE\s*/
AND_PATTERN = /\A(\ *AND)\b/i
OR_PATTERN = /\A(\ *OR)\b/i
def parse( io )
@q = []
io.each_line(nil) do |whole|
@s = StringScanner.new(whole)
end
scan_str
# @q.push [ false, nil ]
@q.push [ false, [@s.pos, nil] ]
## call racc's private parse method
do_parse
end
## called by racc
def next_token
@q.shift
end
def scan_str
until @s.eos? do
case
when @s.scan(AND_PATTERN)
@q.push [ :AND, [@s.pos, @s[1]] ]
when @s.scan(OR_PATTERN)
@q.push [ :OR, [@s.pos, @s[1]] ]
when @s.scan(SPACES_PATTERN)
@q.push [ :SPACES, [@s.pos, @s[1]] ]
when @s.scan(QUESTION_PATTERN)
@q.push [ :QUESTION, [@s.pos, nil] ]
when @s.scan(COMMA_PATTERN)
@q.push [ :COMMA, [@s.pos, ','] ]
when @s.scan(LPAREN_PATTERN)
@q.push [ :LPAREN, [@s.pos, '('] ]
when @s.scan(RPAREN_PATTERN)
@q.push [ :RPAREN, [@s.pos, ')'] ]
when @s.scan(ELSE_PATTERN)
@q.push [ :ELSE, [@s.pos, nil] ]
when @s.scan(ACTUAL_COMMENT_PATTERN)
@q.push [ :ACTUAL_COMMENT, [@s.pos, @s[1], @s[2]] ] if @preserve_comment
when @s.scan(BEGIN_END_PATTERN)
@q.push [ @s[2].intern, [@s.pos, nil] ]
when @s.scan(CONDITIONAL_PATTERN)
@q.push [ @s[2].intern, [@s.pos, @s[3]] ]
when @s.scan(EMBED_VARIABLE_PATTERN)
@q.push [ :EMBED_VARIABLE, [@s.pos, @s[2]] ]
when @s.scan(PAREN_BIND_VARIABLE_PATTERN)
@q.push [ :PAREN_BIND_VARIABLE, [@s.pos, @s[2]] ]
when @s.scan(BIND_VARIABLE_PATTERN)
@q.push [ :BIND_VARIABLE, [@s.pos, @s[2]] ]
when @s.scan(STRING_LITERAL_PATTERN)
@q.push [ :STRING_LITERAL, [@s.pos, @s[1]] ]
when @s.scan(SPLIT_TOKEN_PATTERN)
@q.push [ :IDENT, [@s.pos, @s[1]] ]
when @s.scan(UNMATCHED_COMMENT_START_PATTERN) ## unmatched comment start, '/*','#*'
raise Racc::ParseError, "unmatched comment. line:[#{line_no(@s.pos)}], str:[#{@s.rest}]"
when @s.scan(LITERAL_PATTERN) ## other string token
@q.push [ :IDENT, [@s.pos, @s[1]] ]
when @s.scan(SEMICOLON_AT_INPUT_END_PATTERN)
#drop semicolon at input end
else
raise Racc::ParseError, "syntax error at or near line:[#{line_no(@s.pos)}], str:[#{@s.rest}]"
end
end
end
## override racc's default on_error method
def on_error(t, v, vstack)
## cursor in value-stack is an array of two items,
## that have position value as 0th item. like [731, "ctx[:limit] "]
cursor = vstack.find do |tokens|
tokens.size == 2 and tokens[0].kind_of?(Fixnum)
end
pos = cursor[0]
line = line_no(pos)
rest = @s.string[pos .. -1]
raise Racc::ParseError, "syntax error at or near line:[#{line}], str:[#{rest}]"
end
def line_no(pos)
lines = 0
scanned = @s.string[0..(pos)]
scanned.each_line { lines += 1 }
lines
end
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