58 lines
1.6 KiB
C
58 lines
1.6 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 text.c
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* @brief VM opcode snippet for retrieving the concatenated text of an XML node.
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*
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* Included by vm.c; implements OP_XML_TEXT.
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*
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* Opcode: OP_XML_TEXT
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* - Stack effect: pop (int node_handle) → push (string text)
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* - Behavior: Retrieves the node's textual content as produced by
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* xmlNodeGetContent(), which concatenates all descendant text nodes.
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* If the node is invalid or has no textual content, an empty string is
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* pushed.
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* - Gating: If FUN_WITH_XML2 is disabled, the input is discarded and an empty
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* string is pushed.
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*
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* Notes
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* - The returned string is copied into a VM string value; libxml2 buffers are
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* freed immediately after use.
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*
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* Example
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* - stack: [ node_handle ]
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* - OP_XML_TEXT → [ "Hello world" ]
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*/
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/* OP_XML_TEXT: pops node handle; pushes string (concatenate text node children) */
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case OP_XML_TEXT: {
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#ifdef FUN_WITH_XML2
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Value vh = pop_value(vm);
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int h = (vh.type == VAL_INT) ? (int)vh.i : 0;
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xmlNodePtr n = xml_node_get(h);
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free_value(vh);
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if (!n) {
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push_value(vm, make_string(""));
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break;
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}
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xmlChar *content = xmlNodeGetContent(n);
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if (!content) {
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push_value(vm, make_string(""));
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break;
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}
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push_value(vm, make_string((const char *)content));
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xmlFree(content);
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#else
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Value drop = pop_value(vm);
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free_value(drop);
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push_value(vm, make_string(""));
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#endif
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break;
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}
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