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csv-sql/src/evaluate-expression.js at master · DavidTimms/csv-sql · GitHub
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evaluate-expression.js
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evaluate-expression.js
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import
{
}
from
'./aggregates'
;
export
function
evaluateExpression
(
exp
,
context
)
{
switch
(
exp
.
type
)
{
case
'number'
:
case
'string'
:
case
'literal'
:
case
'star'
:
return
exp
.
value
;
case
'identifier'
:
if
(
context
.
hasOwnProperty
(
exp
.
value
)
)
{
return
context
[
exp
.
value
]
;
}
throw
ReferenceError
(
'Column not found: '
+
exp
.
string
)
;
case
'call'
:
if
(
functions
.
hasOwnProperty
(
exp
.
functionName
)
)
{
const
argValues
=
exp
.
arguments
.
map
(
arg
=>
evaluateExpression
(
arg
,
context
)
)
;
return
functions
[
exp
.
functionName
]
(
...
argValues
)
;
}
throw
ReferenceError
(
`SQL function not found:
${
exp
.
functionName
}
`
)
;
case
'binaryExpression'
:
return
performBinaryOperation
(
exp
.
operator
,
evaluateExpression
(
exp
.
left
,
context
)
,
evaluateExpression
(
exp
.
right
,
context
)
)
;
case
'aggregate'
:
return
context
.
_aggregateValues
[
exp
.
id
]
;
case
'caseIf'
:
return
evaluateCaseIf
(
exp
,
context
)
;
case
'caseSwitch'
:
return
evaluateCaseSwitch
(
exp
,
context
)
;
default
:
throw
Error
(
`Unexpected expression type:
${
exp
.
type
}
`
)
;
}
}
function
performBinaryOperation
(
operator
,
left
,
right
)
{
switch
(
operator
)
{
case
'='
:
return
str
(
left
)
===
str
(
right
)
;
case
'!='
:
case
'<>'
:
return
str
(
left
)
!==
str
(
right
)
;
case
'>'
:
return
Number
(
left
)
>
Number
(
right
)
;
case
'<'
:
return
Number
(
left
)
<
Number
(
right
)
;
case
'>='
:
return
Number
(
left
)
>=
Number
(
right
)
;
case
'<='
:
return
Number
(
left
)
<=
Number
(
right
)
;
// TODO make logical operators short-circuit
case
'OR'
:
return
Boolean
(
left
)
||
Boolean
(
right
)
;
case
'AND'
:
return
Boolean
(
left
)
&&
Boolean
(
right
)
;
case
'LIKE'
:
return
str
(
left
)
.
search
(
patternToRegExp
(
right
)
)
!==
-
1
;
case
'+'
:
return
Number
(
left
)
+
Number
(
right
)
;
case
'-'
:
return
left
-
right
;
case
'*'
:
return
left
*
right
;
case
'/'
:
return
left
/
right
;
case
'%'
:
return
left
%
right
;
case
'^'
:
return
Math
.
pow
(
left
,
right
)
;
default
:
throw
Error
(
`Unknown operator:
${
operator
}
`
)
;
}
}
function
evaluateCaseIf
(
{
cases
,
elseExpression
}
,
context
)
{
for
(
let
i
=
0
;
i
<
cases
.
length
;
i
++
)
{
if
(
evaluateExpression
(
cases
[
i
]
.
when
,
context
)
)
{
return
evaluateExpression
(
cases
[
i
]
.
then
,
context
)
;
}
}
if
(
elseExpression
)
{
return
evaluateExpression
(
elseExpression
,
null
)
;
}
else
{
return
null
;
}
}
function
evaluateCaseSwitch
(
{
switchExpression
,
cases
,
elseExpression
}
,
context
)
{
const
switchValue
=
evaluateExpression
(
switchExpression
,
context
)
;
for
(
let
i
=
0
;
i
<
cases
.
length
;
i
++
)
{
if
(
evaluateExpression
(
cases
[
i
]
.
when
,
context
)
===
switchValue
)
{
return
evaluateExpression
(
cases
[
i
]
.
then
,
context
)
;
}
}
if
(
elseExpression
)
{
return
evaluateExpression
(
elseExpression
,
null
)
;
}
else
{
return
null
;
}
}
const
escapeChars
=
'.[]\\^|$()?:*+{}!'
;
const
escapeCharsRegExp
=
new
RegExp
(
`(
${
escapeChars
.
split
(
''
)
.
map
(
c
=>
'\\'
+
c
)
.
join
(
'|'
)
}
)`
,
'g'
)
;
const
patternRegExpCache
=
{
}
;
export
function
patternToRegExp
(
pattern
)
{
if
(
!
patternRegExpCache
.
hasOwnProperty
(
pattern
)
)
{
const
regExpString
=
pattern
.
replace
(
escapeCharsRegExp
,
'\\$1'
)
.
replace
(
/
_
|
%
/
g
,
c
=>
c
===
'_'
?
'.'
:
'.*'
)
;
patternRegExpCache
[
pattern
]
=
new
RegExp
(
`^
${
regExpString
}
$`
,
'gi'
)
;
}
return
patternRegExpCache
[
pattern
]
;
}
export
function
isNull
(
value
)
{
return
value
===
null
||
value
===
undefined
||
value
===
''
;
}
export
function
str
(
value
)
{
if
(
value
===
null
||
value
===
undefined
)
return
''
;
else
return
String
(
value
)
;
}
const
functions
=
{
UPPERCASE
(
s
)
{
return
s
===
null
&&
s
===
undefined
?
null
:
String
(
s
)
.
toUpperCase
(
)
;
}
,
LOWERCASE
(
s
)
{
return
s
===
null
&&
s
===
undefined
?
null
:
String
(
s
)
.
toLowerCase
(
)
;
}
,
LEN
(
s
)
{
return
isNull
(
s
)
?
null
:
str
(
s
)
.
length
;
}
,
COALESCE
(
...
args
)
{
for
(
let
i
=
0
;
i
<
args
.
length
;
i
++
)
{
if
(
!
isNull
(
args
[
i
]
)
)
return
args
[
i
]
;
}
return
null
;
}
,
TRIM
(
s
,
chars
)
{
if
(
isNull
(
s
)
)
return
null
;
s
=
str
(
s
)
;
if
(
arguments
.
length
<
2
)
{
return
s
.
trim
(
)
;
}
else
{
let
startIndex
=
0
let
endIndex
=
s
.
length
-
1
;
while
(
chars
.
indexOf
(
s
[
startIndex
]
)
>=
0
)
startIndex
++
;
if
(
startIndex
===
s
.
length
)
return
''
;
while
(
chars
.
indexOf
(
s
[
endIndex
]
)
>=
0
)
endIndex
--
;
return
s
.
substring
(
startIndex
,
endIndex
+
1
)
;
}
}
,
LTRIM
(
s
,
chars
=
' \t\n\r'
,
min
=
0
)
{
if
(
isNull
(
s
)
)
return
null
;
s
=
str
(
s
)
;
let
startIndex
=
0
while
(
chars
.
indexOf
(
s
[
startIndex
]
)
>=
0
&&
s
.
length
-
startIndex
>
min
)
{
startIndex
++
;
}
return
s
.
substring
(
startIndex
)
;
}
,
}
;
functions
.
IFNULL
=
functions
.
COALESCE
;
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