61 lines
1.8 KiB
C
61 lines
1.8 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 parse.c
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* @brief VM opcode snippet for parsing a JSON string into a Fun Value.
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*
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* Implements the OP_JSON_PARSE instruction. Expects a string (or any value
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* convertible to string) on the stack, parses it with json-c, converts the
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* resulting json_object to a Fun Value and pushes it.
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*
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* Build gating: compiled only when FUN_WITH_JSON is enabled. Otherwise the
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* opcode consumes its argument and pushes Nil.
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*
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* Stack effect (with FUN_WITH_JSON):
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* - Pops: text (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 allocation fails, tokenization fails, or the text is not valid JSON,
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* the opcode pushes Nil.
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* - The temporary json-c objects are released after conversion; ownership of
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* the pushed Fun Value follows normal VM semantics.
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*/
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/* JSON_PARSE */
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case OP_JSON_PARSE: {
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#ifdef FUN_WITH_JSON
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Value text = pop_value(vm);
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char *s = value_to_string_alloc(&text);
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free_value(text);
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if (!s) {
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push_value(vm, make_nil());
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break;
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}
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struct json_tokener *tok = json_tokener_new();
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json_object *root = json_tokener_parse_ex(tok, s, (int)strlen(s));
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enum json_tokener_error jerr = json_tokener_get_error(tok);
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json_tokener_free(tok);
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free(s);
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if (jerr != json_tokener_success) {
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push_value(vm, make_nil());
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} else {
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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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}
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#else
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/* Fallback when JSON is disabled: consume arg, push Nil */
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Value drop = pop_value(vm);
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free_value(drop);
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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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