From 7380da43ab403dacb41d2010093d11942bb7cec1 Mon Sep 17 00:00:00 2001 From: John Wiegley Date: Mon, 21 May 2007 20:42:05 +0000 Subject: Many changes. --- src/data/builder.h | 256 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 256 insertions(+) create mode 100644 src/data/builder.h (limited to 'src/data/builder.h') diff --git a/src/data/builder.h b/src/data/builder.h new file mode 100644 index 00000000..a193879e --- /dev/null +++ b/src/data/builder.h @@ -0,0 +1,256 @@ +/* + * Copyright (c) 2003-2007, John Wiegley. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: + * + * - Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * - Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * - Neither the name of New Artisans LLC nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#ifndef _BUILDER_H +#define _BUILDER_H + +#include "document.h" + +namespace ledger { +namespace xml { + +/** + * @class builder_t + * + * @brief Represents an interface for building a data hierarchy. + * + * This interface is much like .NET's XmlWriter facility. It + * abstracts the kind of hierarchy we're building, instead focusing + * only on the relationships. + */ +class builder_t +{ +public: + struct position_t + { + typedef uint_least32_t file_pos_t; + typedef uint_least32_t file_line_t; + + file_pos_t offset; + file_line_t linenum; + + position_t() : offset(0), linenum(0) {} + + explicit position_t(file_pos_t _offset, + file_line_t _linenum) + : offset(_offset), linenum(_linenum) {} + }; + +protected: + position_t current_position; + +public: + virtual ~builder_t() {} + + virtual void set_start_position(std::istream& in) {} + virtual void set_position(const position_t& position) {} + virtual position_t& position() { return current_position; } + + virtual void push_attr(const string& name, + const string& value) = 0; + virtual void push_attr(const node_t::nameid_t name_id, + const string& value) = 0; + + virtual void begin_node(const string& name, bool terminal = false) = 0; + virtual void begin_node(const node_t::nameid_t name_id, bool terminal = false) = 0; + + virtual void push_node(const string& name, + const optional& end_pos = none) = 0; + virtual void push_node(const node_t::nameid_t name_id, + const optional& end_pos = none) = 0; + + virtual node_t * current_node() = 0; + + virtual void append_text(const string& text) = 0; + + virtual node_t * end_node(const string& name, + const optional& end_pos = none) = 0; + virtual node_t * end_node(const node_t::nameid_t name_id, + const optional& end_pos = none) = 0; +}; + +/** + * @class xml_builder_t + * + * @brief Build a generic node_t hierarchy. + * + * This builder can be used to parse ordinary XML into a document + * object structure which can then be traversed in memory. + */ +class document_builder_t : public builder_t +{ +protected: + typedef std::list > attrs_list; + + document_t& document_; + attrs_list current_attrs; + node_t * current; + string current_text; + +public: + document_builder_t(document_t& _document) + : document_(_document), current(&document_) {} + + virtual void push_attr(const string& name, + const string& value) { + push_attr(document().register_name(name), value); + } + virtual void push_attr(const node_t::nameid_t name_id, + const string& value) { + current_attrs.push_back(attrs_list::value_type(name_id, value.c_str())); + } + + virtual void begin_node(const string& name, bool terminal = false) { + begin_node(document().register_name(name), terminal); + } + virtual void begin_node(const node_t::nameid_t name_id, + bool terminal = false) { + if (terminal) + current = current->as_parent_node().create_child(name_id); + else + current = current->as_parent_node().create_child(name_id); + + foreach (const attrs_list::value_type& pair, current_attrs) + current->set_attr(pair.first, pair.second.c_str()); + current_attrs.clear(); + } + + virtual void push_node(const string& name, + const optional& end_pos = none) { + begin_node(name, true); + end_node(name, end_pos); + } + virtual void push_node(const node_t::nameid_t name_id, + const optional& end_pos = none) { + begin_node(name_id, true); + end_node(name_id, end_pos); + } + + virtual document_t& document() { + return document_; + } + virtual node_t * current_node() { + return current; + } + + virtual void append_text(const string& text) { + assert(! current->is_parent_node()); + polymorphic_downcast(current)->set_text(text); + } + + virtual node_t * end_node(const string& name, + const optional& end_pos = none) { + return current = &*current->parent(); + } + virtual node_t * end_node(const node_t::nameid_t name_id, + const optional& end_pos = none) { + return current = &*current->parent(); + } +}; + +/** + * @class xml_writer_t + * + * @brief Create textual XML on the given output stream. + * + * This builder, rather than manipulating data structures in memory, + * simply streams its contents on the fly to the given output stream. + * It uses only enough memory to remember the currently push + * attributes and text. + */ +class xml_writer_t : public builder_t +{ + typedef std::list > attrs_list; + + attrs_list current_attrs; + std::ostream& outs; + +public: + xml_writer_t(std::ostream& _outs) : outs(_outs) { + outs << ""; + begin_node("ledger"); + } + ~xml_writer_t() { + end_node("ledger"); + } + + virtual void push_attr(const string& name, + const string& value) { + current_attrs.push_back(attrs_list::value_type(name, value)); + } + virtual void push_attr(const node_t::nameid_t name_id, + const string& value) { + push_attr("hello", value); + } + + virtual void begin_node(const string& name, bool terminal = false) { + outs << '<' << name; + foreach (const attrs_list::value_type& attr, current_attrs) + outs << ' ' << attr.first << "=\"" << attr.second << "\""; + current_attrs.clear(); + outs << '>'; + } + virtual void begin_node(const node_t::nameid_t name_id, bool terminal = false) { + begin_node("hello"); + } + + virtual void push_node(const string& name, + const optional& end_pos = none) { + begin_node(name, true); + end_node(name, end_pos); + } + virtual void push_node(const node_t::nameid_t name_id, + const optional& end_pos = none) { + push_node("hello", end_pos); + } + + virtual node_t * current_node() { return NULL; } + + virtual void append_text(const string& text) { + outs << text; + } + + virtual node_t * end_node(const string& name, + const optional& end_pos = none) { + outs << "'; + return NULL; + } + virtual node_t * end_node(const node_t::nameid_t name_id, + const optional& end_pos = none) { + end_node("hello", end_pos); + return NULL; + } +}; + +} // namespace xml +} // namespace ledger + +#endif // _BUILDER_H -- cgit v1.2.3