kernelscript/src/parse.ml at main · multikernel/kernelscript · GitHub

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* Licensed under the Apache License, Version 2.0 (the "License");

* you may not use this file except in compliance with the License.

* You may obtain a copy of the License at

* http://www.apache.org/licenses/LICENSE-2.0

* Unless required by applicable law or agreed to in writing, software

* distributed under the License is distributed on an "AS IS" BASIS,

* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

* See the License for the specific language governing permissions and

* limitations under the License.

(** Parser interface for KernelScript *)

open Ast

exception Parse_error of string * position

let create_parse_error msg pos =

raise (Parse_error (msg, pos))

(** Parse a string into an AST *)

let parse_string ?(filename="<string>") str =

let lexbuf = Lexing.from_string str in

Lexing.set_filename lexbuf filename;

try

Parser.program Lexer.token lexbuf

with

| Parser.Error ->

let pos = Lexing.lexeme_start_p lexbuf in

let parse_pos = {

line = pos.pos_lnum;

column = pos.pos_cnum - pos.pos_bol + 1;

filename = pos.pos_fname

} in

create_parse_error "Syntax error" parse_pos

| Lexer.Lexer_error msg ->

let pos = Lexing.lexeme_start_p lexbuf in

let parse_pos = {

line = pos.pos_lnum;

column = pos.pos_cnum - pos.pos_bol + 1;

filename = pos.pos_fname

} in

create_parse_error ("Lexer error: " ^ msg) parse_pos

| e ->

let pos = { line = 1; column = 1; filename } in

create_parse_error ("Parse error: " ^ Printexc.to_string e) pos

(** Parse a file into an AST *)

let parse_file filename =

try

let ic = open_in filename in

let content = really_input_string ic (in_channel_length ic) in

close_in ic;

parse_string ~filename content

with

| Sys_error msg ->

let pos = { line = 1; column = 1; filename } in

create_parse_error ("File error: " ^ msg) pos

(** Validate parsed AST *)

let validate_ast ast =

let rec validate_expr expr =

match expr.expr_desc with

| Literal _ | Identifier _ -> true

| ConfigAccess (_, _) -> true (* Config access is always valid syntactically *)

| Call (callee_expr, args) -> validate_expr callee_expr && List.for_all validate_expr args

| ArrayAccess (arr, idx) -> validate_expr arr && validate_expr idx

| FieldAccess (obj, _) -> validate_expr obj

| ArrowAccess (obj, _) -> validate_expr obj

| BinaryOp (left, _, right) -> validate_expr left && validate_expr right

| UnaryOp (_, expr) -> validate_expr expr

| StructLiteral (_, field_assignments) ->

List.for_all (fun (_, field_expr) -> validate_expr field_expr) field_assignments

| TailCall (_, args) -> List.for_all validate_expr args

| ModuleCall module_call -> List.for_all validate_expr module_call.args

| Match (matched_expr, arms) ->

validate_expr matched_expr &&

List.for_all (fun arm ->

match arm.arm_body with

| SingleExpr expr -> validate_expr expr

| Block stmts -> List.for_all validate_stmt stmts

) arms

| New _ -> true

| NewWithFlag (_, flag_expr) -> validate_expr flag_expr (* New expressions are always syntactically valid *)

and validate_stmt stmt =

match stmt.stmt_desc with

| ExprStmt expr -> validate_expr expr

| Assignment (_, expr) -> validate_expr expr

| CompoundAssignment (_, _, expr) -> validate_expr expr

| CompoundIndexAssignment (map_expr, key_expr, _, value_expr) ->

validate_expr map_expr && validate_expr key_expr && validate_expr value_expr

| CompoundFieldIndexAssignment (map_expr, key_expr, _, _, value_expr) ->

validate_expr map_expr && validate_expr key_expr && validate_expr value_expr

| FieldAssignment (obj_expr, _, value_expr) ->

validate_expr obj_expr && validate_expr value_expr

| ArrowAssignment (obj_expr, _, value_expr) ->

validate_expr obj_expr && validate_expr value_expr

| IndexAssignment (map_expr, key_expr, value_expr) ->

validate_expr map_expr && validate_expr key_expr && validate_expr value_expr

| Declaration (_, _, expr_opt) ->

(match expr_opt with

| Some expr -> validate_expr expr

| None -> true)

| ConstDeclaration (_, _, expr) -> validate_expr expr

| Return None -> true

| Return (Some expr) -> validate_expr expr

| If (cond, then_stmts, else_opt) ->

validate_expr cond &&

List.for_all validate_stmt then_stmts &&

(match else_opt with None -> true | Some stmts -> List.for_all validate_stmt stmts)

| IfLet (_, expr, then_stmts, else_opt) ->

validate_expr expr &&

List.for_all validate_stmt then_stmts &&

(match else_opt with None -> true | Some stmts -> List.for_all validate_stmt stmts)

| For (_, start, end_, body) ->

validate_expr start && validate_expr end_ && List.for_all validate_stmt body

| ForIter (_, _, iterable, body) ->

validate_expr iterable && List.for_all validate_stmt body

| While (cond, body) ->

validate_expr cond && List.for_all validate_stmt body

| Delete target ->

(match target with

| DeleteMapEntry (map_expr, key_expr) -> validate_expr map_expr && validate_expr key_expr

| DeletePointer ptr_expr -> validate_expr ptr_expr)

| Break -> true

| Continue -> true

| Try (try_stmts, catch_clauses) ->

List.for_all validate_stmt try_stmts &&

List.for_all (fun clause -> List.for_all validate_stmt clause.catch_body) catch_clauses

| Throw _ -> true (* Throw statements are always valid syntactically *)

| Defer expr -> validate_expr expr

let validate_function func =

List.for_all validate_stmt func.func_body

let validate_declaration = function

| AttributedFunction attr_func -> validate_function attr_func.attr_function

| GlobalFunction func -> validate_function func

| TypeDef _ -> true (* Type definitions are always valid once parsed *)

| MapDecl _ -> true (* Map declarations are always valid once parsed *)

| ConfigDecl _ -> true (* Config declarations are always valid once parsed *)

| StructDecl _ -> true (* Struct declarations are always valid once parsed *)

| GlobalVarDecl _ -> true (* Global variable declarations are always valid once parsed *)

| ImplBlock impl_block ->

(* Validate all functions in the impl block *)

List.for_all (function

| ImplFunction func -> validate_function func

| ImplStaticField (_, expr) -> validate_expr expr

) impl_block.impl_items

| ImportDecl _ -> true (* Import declarations are always valid once parsed *)

| ExternKfuncDecl _ -> true (* Extern kfunc declarations are always valid once parsed *)

| IncludeDecl _ -> true (* Include declarations are always valid once parsed *)

List.for_all validate_declaration ast

(** Pretty-print parse errors *)

let string_of_parse_error (msg, pos) =

Printf.sprintf "%s at %s" msg (string_of_position pos)

let print_parse_error (msg, pos) =

Printf.eprintf "Parse error: %s\n" (string_of_parse_error (msg, pos))

kernelscript/src/parse.ml at main · multikernel/kernelscript · GitHub

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