59 lines
1.7 KiB
C
59 lines
1.7 KiB
C
/**
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* This file is part of the Fun programming language.
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* https://fun-lang.xyz/
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*
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* Copyright 2025 Johannes Findeisen <you@hanez.org>
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* Licensed under the terms of the Apache-2.0 license.
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* https://opensource.org/license/apache-2-0
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*/
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/**
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* @file from_file.c
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* @brief VM opcode snippet for loading a JSON document from a file.
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*
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* This snippet is included by vm.c and implements the OP_JSON_FROM_FILE
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* instruction. It expects a path on the VM stack, reads the file using
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* json-c, converts the resulting json_object tree into a Fun Value, and
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* pushes that Value back on the VM stack.
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*
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* Build gating: compiled only when FUN_WITH_JSON is enabled (json-c
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* available). When disabled, the opcode consumes its argument (if any)
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* and pushes Nil.
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*
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* Stack effect (with FUN_WITH_JSON):
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* - Pops: path (any; converted to string)
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* - Pushes: Value converted from JSON, or Nil on error
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*
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* Errors and edge cases:
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* - If the path cannot be converted to a C string or json_object_from_file
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* fails (e.g., missing file, invalid JSON), the opcode pushes Nil.
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* - The created json_object is released after conversion; ownership of the
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* pushed Fun Value follows normal VM semantics.
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*/
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/* JSON_FROM_FILE */
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case OP_JSON_FROM_FILE: {
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#ifdef FUN_WITH_JSON
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Value vpath = pop_value(vm);
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char *path = value_to_string_alloc(&vpath);
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free_value(vpath);
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if (!path) {
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push_value(vm, make_nil());
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break;
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}
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json_object *root = json_object_from_file(path);
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free(path);
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if (!root) {
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push_value(vm, make_nil());
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break;
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}
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Value v = json_to_fun(root);
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push_value(vm, v);
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json_object_put(root);
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#else
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Value vpath = pop_value(vm);
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free_value(vpath);
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push_value(vm, make_nil());
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#endif
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break;
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}
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