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A 'New' instruction is added in VM to manage initialisation
of typed variables in the stack. The instantiated type symbols
are now added to global data. Accessing and setting values by
address is now working.
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This is incomplete because the scalar variables are not addressable
right now. To be addressable they must be represented as reflect
values, not interfaces.
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The structures are reresented by reflect values. New instructions
`Field` and `Vassign` have been added to the VM to assign reflect
values and access struct fields.
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Recursive structs and embedded structs are not supported yet.
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Only symbols are produced, no bytecode is emitted. The constant
expressions are evaluated at compile time using the stdlib package
go/constant. The parser handles implicit repetition of the last
non-empty expression list. The iota symbol is reset to 0 and
incremented for each line of a const block.
To be done in a next commit: type conversions.
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The parsing logic for type declarations is there. Note that no
tokens are produced, only symbols. The different type kinds will
be added next.
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The full Go syntax is supported, blocks or line,
mutiple comma separated variables, assignments.
In local and global frame.
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A VM instruction `EqualSet` has been added to preserve the left
operand on the stack in case of failure, to allow efficient
multiple tests on the same value.
Both the pattern 'if/else if' and the classical case clauses have
been implemented.
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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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As specified in the Go specification, adapted to the following:
- the scanner recognise blocks as tokens
- the scanner is multi-language: define keywords in scanner spec
- as a result, we define how to skip semi-colon insertion rather
than how to add it.
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The scanner returns a slice of pointers to tokens instead of a
slice of tokens. The parser now pass the initial node context.
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Refctor node kind names by concatenating category and instance, to
allow better sorting. Comments are now parsed and skipped during
generation of AST.
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So multiple successive incremental Evals function correctly.
Also improve the following:
- Apply the same Eval API to vm0 and vm1
- parser: dot diagram display is now synchronous
- codegen: outsource complex code generation for readability
- vm1: Pop take the number of values to pop as operand
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* codegen: add a bytecode generator
* cleaning scanner, parser and vm1.
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* parser: define all node kinds to make the parser multi-language
Defining all AST node kinds in the parser is necessary to make the
parser really multi-language. If a language requires a node kind not
already present in parser/kind.go, it will be necessary to add it first
here.
Note that as long as a node kind subtree is structurally identical
between languages, even if there are lexical and/or syntaxic
differences, it can (and must) be shared amongst multiple language
definitions.
For example, an "if" statememt in shell script or in C code should give
the same `IfStmt` at AST level.
In order to let the parser deal with the various language syntaxes,
and produce the right node kind and subtree, parser flags will be set
in language definitions (see `Flags` field in `NodeSpec` struct).
* lang/golang: use parser node kinds
* vm0: remode dependency on language definition.
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