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Logical operators `&&` (and), `||` (or) are now parsed in expressions.
The control flow tokens (labels, conditional jumps) are added
accordingly.
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* chore: refactor to keep only the new parser and bytecode vm
* scanner: remove Token.value field
* scanner: remove scanner.kind field
* chore: move language specification in lang package
This avoid a cyclic dependency in scanner_test which can now use
the golang/GoSpec language specification for Go.
* clean code
* scanner: export scanner fields
Also parser now generate function calls, including externals.
* chore: fix lint issues
* parser: handle strings
* wip
* parser: implement support for 'if, else, else if' statements
Resolving labels in the compiler still in progress.
* parser: support if statements, improve compiler
* improve handling of functions
* improve support of local variables
* scanner: trim leading and trailing spaces
* fixes to make fibonacci work
* parser: improve README, fix function parameters parsing
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Also isolate repl in a separate function.
Introduce `run` function for executing programs, letting room for
other verbs to be done later: test, debug, ...
Use file path as argument. Standard input redirect is no more mandatory.
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Also simplify project structure. The executable is now produced in
the root directory. Work in progress.
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