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mathjs/src/utils/string.js at develop · joncv/mathjs · GitHub
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utils
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string.js
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'use strict'
const
formatNumber
=
require
(
'./number'
)
.
format
const
formatBigNumber
=
require
(
'./bignumber/formatter'
)
.
format
const
isBigNumber
=
require
(
'./bignumber/isBigNumber'
)
/**
* Test whether value is a string
*
@param
{
*
} value
*
@return
{
boolean
} isString
*/
exports
.
isString
=
function
(
value
)
{
return
typeof
value
===
'string'
}
/**
* Check if a text ends with a certain string.
*
@param
{
string
} text
*
@param
{
string
} search
*/
exports
.
endsWith
=
function
(
text
,
search
)
{
const
start
=
text
.
length
-
search
.
length
const
end
=
text
.
length
return
(
text
.
substring
(
start
,
end
)
===
search
)
}
/**
* Format a value of any type into a string.
*
* Usage:
* math.format(value)
* math.format(value, precision)
*
* When value is a function:
*
* - When the function has a property `syntax`, it returns this
* syntax description.
* - In other cases, a string `'function'` is returned.
*
* When `value` is an Object:
*
* - When the object contains a property `format` being a function, this
* function is invoked as `value.format(options)` and the result is returned.
* - When the object has its own `toString` method, this method is invoked
* and the result is returned.
* - In other cases the function will loop over all object properties and
* return JSON object notation like '{"a": 2, "b": 3}'.
*
* Example usage:
* math.format(2/7) // '0.2857142857142857'
* math.format(math.pi, 3) // '3.14'
* math.format(new Complex(2, 3)) // '2 + 3i'
* math.format('hello') // '"hello"'
*
*
@param
{
*
} value Value to be stringified
*
@param
{
Object | number | Function
} [options] Formatting options. See
* lib/utils/number:format for a
* description of the available
* options.
*
@return
{
string
} str
*/
exports
.
format
=
function
(
value
,
options
)
{
if
(
typeof
value
===
'number'
)
{
return
formatNumber
(
value
,
options
)
}
if
(
isBigNumber
(
value
)
)
{
return
formatBigNumber
(
value
,
options
)
}
// note: we use unsafe duck-typing here to check for Fractions, this is
// ok here since we're only invoking toString or concatenating its values
if
(
looksLikeFraction
(
value
)
)
{
if
(
!
options
||
options
.
fraction
!==
'decimal'
)
{
// output as ratio, like '1/3'
return
(
value
.
s
*
value
.
n
)
+
'/'
+
value
.
d
}
else
{
// output as decimal, like '0.(3)'
return
value
.
toString
(
)
}
}
if
(
Array
.
isArray
(
value
)
)
{
return
formatArray
(
value
,
options
)
}
if
(
exports
.
isString
(
value
)
)
{
return
'"'
+
value
+
'"'
}
if
(
typeof
value
===
'function'
)
{
return
value
.
syntax
?
String
(
value
.
syntax
)
:
'function'
}
if
(
value
&&
typeof
value
===
'object'
)
{
if
(
typeof
value
.
format
===
'function'
)
{
return
value
.
format
(
options
)
}
else
if
(
value
&&
value
.
toString
(
)
!==
{
}
.
toString
(
)
)
{
// this object has a non-native toString method, use that one
return
value
.
toString
(
)
}
else
{
const
entries
=
[
]
for
(
const
key
in
value
)
{
if
(
value
.
hasOwnProperty
(
key
)
)
{
entries
.
push
(
'"'
+
key
+
'": '
+
exports
.
format
(
value
[
key
]
,
options
)
)
}
}
return
'{'
+
entries
.
join
(
', '
)
+
'}'
}
}
return
String
(
value
)
}
/**
* Stringify a value into a string enclosed in double quotes.
* Unescaped double quotes and backslashes inside the value are escaped.
*
@param
{
*
} value
*
@return
{
string
}
*/
exports
.
stringify
=
function
(
value
)
{
const
text
=
String
(
value
)
let
escaped
=
''
let
i
=
0
while
(
i
<
text
.
length
)
{
let
c
=
text
.
charAt
(
i
)
if
(
c
===
'\\'
)
{
escaped
+=
c
i
++
c
=
text
.
charAt
(
i
)
if
(
c
===
''
||
'"\\/bfnrtu'
.
indexOf
(
c
)
===
-
1
)
{
escaped
+=
'\\'
// no valid escape character -> escape it
}
escaped
+=
c
}
else
if
(
c
===
'"'
)
{
escaped
+=
'\\"'
}
else
{
escaped
+=
c
}
i
++
}
return
'"'
+
escaped
+
'"'
}
/**
* Escape special HTML characters
*
@param
{
*
} value
*
@return
{
string
}
*/
exports
.
escape
=
function
(
value
)
{
let
text
=
String
(
value
)
text
=
text
.
replace
(
/
&
/
g
,
'&'
)
.
replace
(
/
"
/
g
,
'"'
)
.
replace
(
/
'
/
g
,
'''
)
.
replace
(
/
<
/
g
,
'<'
)
.
replace
(
/
>
/
g
,
'>'
)
return
text
}
/**
* Recursively format an n-dimensional matrix
* Example output: "[[1, 2], [3, 4]]"
*
@param
{
Array
} array
*
@param
{
Object | number | Function
} [options] Formatting options. See
* lib/utils/number:format for a
* description of the available
* options.
*
@returns
{
string
} str
*/
function
formatArray
(
array
,
options
)
{
if
(
Array
.
isArray
(
array
)
)
{
let
str
=
'['
const
len
=
array
.
length
for
(
let
i
=
0
;
i
<
len
;
i
++
)
{
if
(
i
!==
0
)
{
str
+=
', '
}
str
+=
formatArray
(
array
[
i
]
,
options
)
}
str
+=
']'
return
str
}
else
{
return
exports
.
format
(
array
,
options
)
}
}
/**
* Check whether a value looks like a Fraction (unsafe duck-type check)
*
@param
{
*
} value
*
@return
{
boolean
}
*/
function
looksLikeFraction
(
value
)
{
return
(
value
&&
typeof
value
===
'object'
&&
typeof
value
.
s
===
'number'
&&
typeof
value
.
n
===
'number'
&&
typeof
value
.
d
===
'number'
)
||
false
}
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