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2021-05-25lexer: implement raw code modeJo-Philipp Wich
Enabling raw code mode allows writing ucode scripts without any template tag decorations (that is, without the need to provide an initial opening '{%' tag). Signed-off-by: Jo-Philipp Wich <jo@mein.io>
2021-05-25lib: rename uc_lib_init() to uc_load_stdlib()Jo-Philipp Wich
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
2021-05-25main, lib: move allocation of globals object into lib functionJo-Philipp Wich
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
2021-05-25main: simplify REQUIRE_SEARCH_PATH initializationJo-Philipp Wich
Do not require parsing in C, pre-split string in cmake and pass it as command separated string array down to CPP, so that it can be interpolated directly into a char *path[] array. Signed-off-by: Jo-Philipp Wich <jo@mein.io>
2021-05-14lexer: skip interpreter line in any source bufferJo-Philipp Wich
Skip interpreter lines in any source buffer and handle the skipping in the lexer itself, to avoid reporting wrongly shifted token offsets to the compiler, resulting in wrong error locations and source contexts. Signed-off-by: Jo-Philipp Wich <jo@mein.io>
2021-05-14main: expose argv as global ARGV array to ucode scriptsJo-Philipp Wich
This allows accessing the arguments of the invoked command line. Signed-off-by: Jo-Philipp Wich <jo@mein.io>
2021-04-27treewide: ISO C / pedantic complianceJo-Philipp Wich
- Shuffle typedefs to avoid need for non-compliant forward declarations - Fix non-compliant empty struct initializers - Remove use of braced expressions - Remove use of anonymous unions - Avoid `void *` pointer arithmetic - Fix several warnings reported by gcc -pedantic mode and clang 11 compilation Signed-off-by: Jo-Philipp Wich <jo@mein.io>
2021-04-26main: fix ineffective EOF check in parse()Jo-Philipp Wich
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
2021-04-25treewide: rework internal data type systemJo-Philipp Wich
Instead of relying on json_object values internally, use custom types to represent the different ucode value types which brings a number of advantages compared to the previous approach: - Due to the use of tagged pointers, small integer, string and bool values can be stored directly in the pointer addresses, vastly reducing required heap memory - Ability to create circular data structures such as `let o; o = { test: o };` - Ability to register custom `tostring()` function through prototypes - Initial mark/sweep GC implementation to tear down circular object graphs on VM deinit The change also paves the way for possible future extensions such as constant variables and meta methods for custom ressource types. Signed-off-by: Jo-Philipp Wich <jo@mein.io>
2021-04-24treewide: fix issues reported by clang code analyzerJo-Philipp Wich
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
2021-04-23main: provide just binary name in help outputPetr Štetiar
Otherwise it prints out complete path which is probably not desired and we would need to filter out paths in the test's output etc. Signed-off-by: Petr Štetiar <ynezz@true.cz>
2021-03-08main: expose global prototype as `global` property on root scopeJo-Philipp Wich
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
2021-02-17treewide: rewrite ucode interpreterJo-Philipp Wich
Replace the former AST walking interpreter implementation with a single pass bytecode compiler and a corresponding virtual machine. The rewrite lays the groundwork for a couple of improvements with will be subsequently implemented: - Ability to precompile ucode sources into binary byte code - Strippable debug information - Reduced runtime memory usage Signed-off-by: Jo-Philipp Wich <jo@mein.io>
2020-12-06treewide: prevent stale pointer access in opcode handlersJo-Philipp Wich
Instead of obtaining and caching direct opcode pointers, use relative references when dealing with opcodes since direct or indirect calls to uc_execute_op() might lead to reallocations of the opcode array, shifting memory addresses and invalidating pointers taken before the invocation. Such stale pointer accesses could be commonly triggered when one part of the processed expression was a require() or include() call loading relatively large ucode sources. Signed-off-by: Jo-Philipp Wich <jo@mein.io>
2020-11-19treewide: rebrand to ucodeJo-Philipp Wich
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
2020-11-10main: fix double free when using multiple -E optionsJo-Philipp Wich
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
2020-10-31main: allow prefixing -e and -E optionsJo-Philipp Wich
By specifying a name, followed by an equal sign before the actual option value, the corresponding JSON data is stored as global variable with the given name, instead of turning each object key into a variable itself. For example while `utpl -e '{ "foo": true, "bar": false }' ...` will set two variables `foo` and `bar`, the alternative syntax `utpl -e 'baz={ "foo": true, "bar": false }' ...` will declare a single variable `baz` holding the object `{ "foo": true, "bar": false }`. Signed-off-by: Jo-Philipp Wich <jo@mein.io>
2020-10-31main: fix leading byte corruption when not starting with #!Jo-Philipp Wich
Reverse the order of the ungetc() calls to properly restore the first two probed bytes. Signed-off-by: Jo-Philipp Wich <jo@mein.io>
2020-10-14treewide: unify error handlingJo-Philipp Wich
Get rid of the distinction between lexer/parser errors and runtime exceptions, use exceptions everywhere instead. Signed-off-by: Jo-Philipp Wich <jo@mein.io>
2020-10-14treewide: rework source file and callstack handlingJo-Philipp Wich
- Keep an open FILE* reference to processed source files in order to be able to rewind and extract error context later - Build a proper call stack when invoking utpl functions - Report call stack in exceptions Signed-off-by: Jo-Philipp Wich <jo@mein.io>
2020-10-14lexer: rewriteJo-Philipp Wich
Rewrite the lexer into a restartable state machine to support parsing from file streams without the need to read the entire source text into memory first. As a side effect, the length of labels and strings is unlimited now. Signed-off-by: Jo-Philipp Wich <jo@mein.io>
2020-10-02lib: tweak error context formattingJo-Philipp Wich
Do not emit additional newline when formatting error context and print it instead when outputting the exception. Signed-off-by: Jo-Philipp Wich <jo@mein.io>
2020-10-02treewide: rework handling of memory allocation failuresJo-Philipp Wich
Instead of propagating failures to the caller, print a generic error message and terminate program execution through abort(). Signed-off-by: Jo-Philipp Wich <jo@mein.io>
2020-10-02main: track current template filename during executionJo-Philipp Wich
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
2020-09-24main: support invoking utpl interpreter through shebangJo-Philipp Wich
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
2020-09-20main: fix memory leak with -e optionJo-Philipp Wich
Release the parsed intermediate object after copying its values into the global env object. Signed-off-by: Jo-Philipp Wich <jo@mein.io>
2020-09-20eval: implement -m option to preload modulesJo-Philipp Wich
The -m option instructs the interpreter to automatically require the named module and to register the module context as global variable. The following two commands are equivalent, with the former one serving as a shortcut for the latter: utpl -m fs -s '{{ fs.open("test.txt").read("all") }}' utpl -s '{% fs = require("fs"); print(fs.open("test.txt").read("all")) %}' Signed-off-by: Jo-Philipp Wich <jo@mein.io>
2020-09-16eval: implement -e and -E options to set global vars from JSONJo-Philipp Wich
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
2020-09-16treewide: implement strict assignment modeJo-Philipp Wich
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
2020-09-10treewide: implement default lstrip_blocks and trim_blocks behaviourJo-Philipp Wich
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
2020-09-10main: fix dumping ASTJo-Philipp Wich
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
2020-09-07main: fix segfault when passed source file is emptyJo-Philipp Wich
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
2020-09-06treewide: refactor internal AST structuresJo-Philipp Wich
- unify operand and value tag structures - use a contiguous array for storing opcodes - use relative offsets for next and children ops - defer function creation to runtime - rework "this" context handling by storing context pointer in scope tags Signed-off-by: Jo-Philipp Wich <jo@mein.io>
2020-08-25main.c: do not dump operands of extended opcodesJo-Philipp Wich
Extendend opcodes might have non-opcode operands which we cannot safely dereference. Signed-off-by: Jo-Philipp Wich <jo@mein.io>
2020-08-25main.c, lib.c: move error formatting logic to lib.cJo-Philipp Wich
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
2020-08-24treewide: remove unneeded libubox dependencyJo-Philipp Wich
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
2020-08-21main.c: adjust usage, drop dead codeJo-Philipp Wich
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
2020-08-21Initial commitJo-Philipp Wich
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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