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Fixes: #132
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Implement a new function `slice()` to complement the existing `splice()`
function and model it's semantics after the ES6 `Array.slice()` version.
Fixes: #106
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Extend the split() and replace() functions to accept an additional optional
`limit` argument which limits the amount of split operations / substitutions
performed by these functions.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Extend the `render()` function to accept a function value as first argument,
which allows running arbitrary ucode functions and capturing their output.
This is especially useful in conjunction with `loadfile()` or `loadstring()`
to dynamically compile templates and rendering their output into a string.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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- getenv(): Allow querying the entire environment by omiting variable name
- split(): Properly handle null bytes in subject and separator strings
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Introduce new functions dealing with on-the-fly compilation of code and
execution of functions with different global scope.
The `loadstring()` and `loadfile()` functions will compile the given
ucode source string or ucode file path respectively and return the entry
function of the resulting program.
An optional dictionary specifying parse options may be given as second
argument.
Both functions return `null` on invalid arguments and throw an exception
in case of compilation errors.
The `call()` function allows invoking a given function value with a
different `this` context and/or a different global environment.
Finally refactor the existing `uc_require_ucode()` implementation to
reuse the new `uc_loadfile()` and `uc_call()` implementations and adjust
as well as simplify affected testcases.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Add two new functions to deal with encoding and decoding of hexadecimal
digit strings:
- hexenc() - convert the given input value into a lower case hex digit
string, implicitely converting the input argument to a string value
if needed
- hexdec() - decode the given input hex digit string into a byte string,
skipping whitespace or optionally specified characters in the input
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Add five new functions to deal with date calculation and timing:
- localtime(), gmtime() - return a broken down calendar date and time
specification from the given epoch (or now, if absent) in local and
UTC time respectively
- timelocal(), timegm() - the inverse operation for the former functions,
taking a date and time specification (interpreted as local or UTC time
respectively) and turning it into an epoch value
- clock() - return the second and nanosecond values of the system clock,
useful for time/performance measurements
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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The most common usecase is extracting the value of a single byte at a
specific offset, e.g. to scan a string char-by-char to construct a hash.
Furthermore, constructing an array which contains the results of multiple
`ord()` invocations is trivial while efficiently extracting a single byte
value without the overhead of an intermediate array is not.
Due to that, change `ord()` to always return a single integer byte value
at the offset specified as second argument or at offset 0 in case no
argument was supplied.
That means that `ord("Abc", 0, 1, 2)` will now return `65` instead of the
former `[ 65, 98, 99 ]` result.
Code relying on the former behaviour should either perform multiple calls
to `ord()`, passing different offsets each time or switch to the `struct`
module which allows efficient unpacking of string data.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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The uniq() function allows extracting all unique values from a given input
array in an efficient manner. It is roughly equivalent to the following
ucode idiom:
let seen = {}
let unique = filter(array, item => !seen[item]++);
In contrast to the code above, `uniq()` does not rely on implicit
stringification of item values but performs strict equality tests internally.
If equivalence of stringified results is desired, the following code can
be used:
let unique = uniq(map(array, item => "" + item));
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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The new functions allow encoding and decoding base64 values respectively.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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The sourcepath() function allows querying the filesystem path of the source
file currently being executed by ucode.
The optional depth argument can be used to walk up the include stack to
determine the path of the file that included the current file, the path of
the parent file of the parent file and so on.
By specifying a truish value as second argument, only the directory portion
of the source file path is returned. This is useful to e.g. discover
ressources relative to the current source file directory.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Introduce support for declaring constant variables through the `const`
keyword. Variables declared with `const` follow the same scoping rules
as `let` declared ones.
In contrast to normal variables, `const` ones may not be assigned to
after their declaration. Any attempt to do so will result in a syntax
error during compilation.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Turn `delete` into a proper operator mimicking ECMAScript semantics.
Also ensure to transparently turn deprecated `delete(obj, propname)`
function calls into `delete obj.propname` expressions during compilation.
When strict mode is active, legacy delete() calls throw a syntax error
instead.
Finally drop the `delete()` function from the stdlib as it is shadowed
by the delete operator syntax now.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Provide a new ucode function regexp() which allows constructing regular
expression instances from separate source and flag strings.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Honour precision specifiers when parsing `J` format strings to enable or
disable JSON pretty printing.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Change uc_include() to retain the prototype of the given scope object when
processing includes. Also change the default behaviour to register the
current VM scope as prototype on the passed scope object so that included
code has access to functions such as length(), print() etc. by default.
To actually sandbox the included code, the new `proto()` function can be
used to create a scope object with an empty prototype:
`include(..., proto({ ... }, {}))`
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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The proto() function allows getting and setting the prototype value of
array or object values, which is useful to build object instances.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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The json function allows parsing JSON strings into structured data.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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The `%J` format allows outputting values as valid JSON string.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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