// ExecutionPipelineBox — Orchestrate Parser → Emit (emit-only; no execution)
using lang.compiler.parser.box as ParserBoxMod
// Parser dependencies (Phase 2 refactoring: hierarchical structure)
using lang.compiler.parser.scan.parser_string_utils_box
using lang.compiler.parser.scan.parser_ident_scan_box
using lang.compiler.parser.scan.parser_number_scan_box
using lang.compiler.parser.scan.parser_string_scan_box
using lang.compiler.parser.using.using_collector_box
using lang.compiler.parser.expr.parser_expr_box
using lang.compiler.parser.expr.parser_peek_box
using lang.compiler.parser.expr.parser_literal_box
using lang.compiler.parser.stmt.parser_stmt_box
using lang.compiler.parser.stmt.parser_control_box
using lang.compiler.parser.stmt.parser_exception_box
using lang.compiler.stage1.json_program_box
using lang.compiler.stage1.emitter_box as EmitterBoxMod
using lang.compiler.pipeline_v2.backend_box as BackendBoxMod

box ExecutionPipelineBox {
  backend_name
  backend

  birth(name) {
    // Optional backend tag (no execution here)
    if name == null { name = "vm" }
    me.backend_name = name
    me.backend = new BackendBox(name)
    return 0
  }

  // Run with source text; stage3_flag=1 enables Stage‑3 acceptance in parser
  run_source(src, stage3_flag) {
    if src == null { src = "return 0" }
    if stage3_flag == null { stage3_flag = 0 }
    // Parse
    local p = new ParserBox()
    if stage3_flag == 1 { p.stage3_enable(1) }
    p.extract_usings(src)
    local usings = p.get_usings_json()
    // Extract extern_c annotations (syntax: @extern_c("c_symbol","Func/Arity");)
    p.extract_externs(src)
    local externs = p.get_externs_json()
    local ast = p.parse_program2(src)
    // Emit Stage‑1 JSON with meta.usings
    local json = EmitterBox.emit_program(ast, usings, externs)
    if json == null || json.length() == 0 { return 1 }
    print(json)
    return 0
  }
}

static box ExecutionPipelineStub { main(args) { return 0 } }
