325 lines
9.3 KiB
C++
325 lines
9.3 KiB
C++
// Copyright (c) 2006, Tobias Sargeant
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions
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// are met:
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//
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// Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the
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// distribution. The names of its contributors may be used to endorse
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// or promote products derived from this software without specific
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// prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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// OF THE POSSIBILITY OF SUCH DAMAGE.
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#pragma once
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#include <gloop/exceptions.hpp>
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#include <gloop/ref.hpp>
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#ifdef WIN32
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typedef char int8_t;
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typedef short int16_t;
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typedef long int32_t;
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typedef unsigned char uint8_t;
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typedef unsigned short uint16_t;
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typedef unsigned long uint32_t;
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#else
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#include <stdint.h>
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#endif
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#include <stdlib.h>
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#include <string>
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#include <list>
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#include <vector>
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namespace gloop {
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namespace stream {
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enum Type {
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I8 = 0x00,
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U8 = 0x01,
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I16 = 0x02,
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U16 = 0x03,
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I32 = 0x04,
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U32 = 0x05,
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F32 = 0x06,
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F64 = 0x07
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};
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static inline Type smallest_type(int32_t min, int32_t max) {
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if (max < 0x80 && min >= -0x80) return I8;
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if (max < 0x8000 && min >= -0x8000) return I16;
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return I32;
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}
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static inline Type smallest_type(uint32_t max) {
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if (max < 0x100) return U8;
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if (max < 0x10000) return U16;
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return U32;
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}
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static inline int type_size(int type) {
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switch (type) {
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case I8: case U8: return 1;
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case I16: case U16: return 2;
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case I32: case U32: case F32: return 4;
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case F64: return 8;
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default: throw gloop::exception("unknown type");
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}
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}
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struct reader_base : public virtual RefObj {
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virtual void _val(int8_t t) =0;
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virtual void _val(uint8_t t) =0;
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virtual void _val(int16_t t) =0;
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virtual void _val(uint16_t t) =0;
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virtual void _val(int32_t t) =0;
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virtual void _val(uint32_t t) =0;
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virtual void _val(float t) =0;
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virtual void _val(double t) =0;
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virtual void begin() { }
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virtual void next() { }
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virtual void fail() { }
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virtual void end() { }
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virtual void length(int l) { }
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};
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struct null_reader : public reader_base {
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virtual void _val(int8_t t) { }
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virtual void _val(uint8_t t) { }
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virtual void _val(int16_t t) { }
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virtual void _val(uint16_t t) { }
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virtual void _val(int32_t t) { }
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virtual void _val(uint32_t t) { }
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virtual void _val(float t) { }
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virtual void _val(double t) { }
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};
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template<typename T>
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struct reader : public reader_base {
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virtual void value(T val) =0;
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virtual void _val(int8_t t) { value((T)t); }
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virtual void _val(uint8_t t) { value((T)t); }
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virtual void _val(int16_t t) { value((T)t); }
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virtual void _val(uint16_t t) { value((T)t); }
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virtual void _val(int32_t t) { value((T)t); }
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virtual void _val(uint32_t t) { value((T)t); }
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virtual void _val(float t) { value((T)t); }
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virtual void _val(double t) { value((T)t); }
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};
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template<typename T>
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void send_scalar(reader_base *rd, const T &v) {
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if (rd) {
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rd->begin();
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rd->length(1);
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rd->next();
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rd->_val(v);
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rd->end();
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}
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}
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template<typename iter_t>
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void send_sequence(reader_base *rd, size_t n, iter_t begin, iter_t end) {
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if (rd) {
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rd->begin();
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rd->length(n);
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while (begin != end) {
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rd->next();
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rd->_val(*begin++);
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}
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rd->end();
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}
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}
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struct writer_base : public virtual RefObj {
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virtual void _val(int8_t &t) =0;
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virtual void _val(uint8_t &t) =0;
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virtual void _val(int16_t &t) =0;
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virtual void _val(uint16_t &t) =0;
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virtual void _val(int32_t &t) =0;
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virtual void _val(uint32_t &t) =0;
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virtual void _val(float &t) =0;
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virtual void _val(double &t) =0;
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virtual bool isList() { return false; }
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virtual Type dataType() { return F64; }
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virtual void begin() { }
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virtual void next() { }
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virtual void fail() { }
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virtual void end() { }
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virtual int length() { return 0; }
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virtual int maxLength() { return 0; }
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};
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struct null_writer : public writer_base {
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virtual void _val(int8_t &t) { }
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virtual void _val(uint8_t &t) { }
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virtual void _val(int16_t &t) { }
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virtual void _val(uint16_t &t) { }
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virtual void _val(int32_t &t) { }
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virtual void _val(uint32_t &t) { }
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virtual void _val(float &t) { }
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virtual void _val(double &t) { }
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};
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template<typename T>
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struct writer : public writer_base {
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virtual T value() =0;
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virtual void _val(int8_t &t) { t = (int8_t)value(); }
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virtual void _val(uint8_t &t) { t = (uint8_t)value(); }
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virtual void _val(int16_t &t) { t = (int16_t)value(); }
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virtual void _val(uint16_t &t) { t = (uint16_t)value(); }
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virtual void _val(int32_t &t) { t = (int32_t)value(); }
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virtual void _val(uint32_t &t) { t = (uint32_t)value(); }
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virtual void _val(float &t) { t = (float)value(); }
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virtual void _val(double &t) { t = (double)value(); }
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};
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// a specification string has the form:
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// block_type.element.property
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// for example:
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// polyhedron.face.vertex_indices
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// for readers, the ordering of specifications is unimportant.
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// for writers, within a block there should be a single block type.
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// within that block, specifications should be ordered by order of
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// addition of element and then by order of addition of property.
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struct named_prop_t {
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std::string name;
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Ref<reader_base> rd;
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Ref<writer_base> wt;
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named_prop_t(const std::string &n) : name(n), rd(NULL), wt(NULL) {}
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};
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typedef std::list<named_prop_t> named_prop_list_t;
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struct named_element_t {
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std::string name;
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named_prop_list_t props;
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Ref<reader_base> rd;
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Ref<writer_base> wt;
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named_element_t(const std::string &n) : name(n), props(), rd(NULL), wt(NULL) {}
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named_prop_t *findProp(const std::string &n) const;
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named_prop_t &findOrCreateProp(const std::string &n);
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};
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typedef std::list<named_element_t> named_element_list_t;
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struct block_t {
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std::string name;
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named_element_list_t elems;
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Ref<reader_base> rd;
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Ref<writer_base> wt;
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block_t(const std::string &n) : name(n), elems(), rd(NULL), wt(NULL) {}
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named_element_t *findElem(const std::string &n) const;
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named_element_t &findOrCreateElem(const std::string &n);
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};
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typedef std::list<block_t> block_list_t;
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class model_reader {
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public:
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block_list_t blocks;
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block_t *findBlock(const std::string &n) const;
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block_t &findOrCreateBlock(const std::string &n);
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named_element_t *findElem(const std::string &b, const std::string &e) const;
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named_element_t &findOrCreateElem(const std::string &b, const std::string &e);
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named_prop_t *findProp(const std::string &b, const std::string &e, const std::string &p) const;
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named_prop_t &findOrCreateProp(const std::string &b, const std::string &e, const std::string &p);
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reader_base *findReader(const std::string &b, const std::string &e, const std::string &p) const {
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named_prop_t *prop = findProp(b, e, p); if (prop) return prop->rd.ptr();
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return NULL;
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}
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reader_base *findReader(const std::string &b, const std::string &e) const {
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named_element_t *elem = findElem(b, e); if (elem) return elem->rd.ptr();
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return NULL;
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}
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reader_base *findReader(const std::string &b) const {
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block_t *blk = findBlock(b); if (blk) return blk->rd.ptr();
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return NULL;
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}
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model_reader() {
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}
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virtual ~model_reader() {
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}
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bool addReader(const std::string &spec, reader_base *rd);
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virtual bool read(std::istream &in) =0;
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};
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struct model_writer {
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std::list<std::pair<std::string, block_t> > blocks;
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public:
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model_writer() {
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}
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virtual ~model_writer() {
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}
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bool newBlock(const std::string &name);
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bool addWriter(const std::string &spec, writer_base *wt);
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virtual bool write(std::ostream &out) =0;
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};
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}
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}
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