911 lines
22 KiB
C++
911 lines
22 KiB
C++
// NREX: Node RegEx
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//
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// Copyright (c) 2015, Zher Huei Lee
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// All rights reserved.
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//
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// This software is provided 'as-is', without any express or implied
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// warranty. In no event will the authors be held liable for any damages
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// arising from the use of this software.
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//
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// Permission is granted to anyone to use this software for any purpose,
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// including commercial applications, and to alter it and redistribute it
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// freely, subject to the following restrictions:
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//
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// 1. The origin of this software must not be misrepresented; you must not
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// claim that you wrote the original software. If you use this software
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// in a product, an acknowledgment in the product documentation would
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// be appreciated but is not required.
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//
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// 2. Altered source versions must be plainly marked as such, and must not
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// be misrepresented as being the original software.
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//
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// 3. This notice may not be removed or altered from any source
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// distribution.
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//
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#include "nrex.hpp"
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#ifdef NREX_UNICODE
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#include <wctype.h>
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#include <wchar.h>
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#define NREX_ISALPHANUM iswalnum
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#define NREX_STRLEN wcslen
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#else
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#include <ctype.h>
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#include <string.h>
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#define NREX_ISALPHANUM isalnum
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#define NREX_STRLEN strlen
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#endif
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#ifdef NREX_THROW_ERROR
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#define NREX_COMPILE_ERROR(M) throw nrex_compile_error(M)
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#else
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#define NREX_COMPILE_ERROR(M) reset(); return false
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#endif
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#ifndef NREX_NEW
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#define NREX_NEW(X) new X
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#define NREX_NEW_ARRAY(X, N) new X[N]
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#define NREX_DELETE(X) delete X
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#define NREX_DELETE_ARRAY(X) delete[] X
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#endif
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template<typename T>
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class nrex_array
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{
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private:
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T* _data;
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unsigned int _reserved;
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unsigned int _size;
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public:
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nrex_array()
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: _data(NREX_NEW_ARRAY(T, 2))
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, _reserved(2)
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, _size(0)
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{
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}
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~nrex_array()
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{
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NREX_DELETE_ARRAY(_data);
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}
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unsigned int size() const
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{
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return _size;
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}
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void reserve(unsigned int size)
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{
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T* old = _data;
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_data = NREX_NEW_ARRAY(T, size);
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_reserved = size;
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for (unsigned int i = 0; i < _size; ++i)
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{
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_data[i] = old[i];
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}
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NREX_DELETE_ARRAY(old);
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}
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void push(T item)
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{
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if (_size == _reserved)
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{
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reserve(_reserved * 2);
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}
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_data[_size] = item;
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_size++;
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}
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T& top()
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{
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return _data[_size - 1];
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}
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const T& operator[] (unsigned int i) const
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{
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return _data[i];
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}
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void pop()
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{
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if (_size > 0)
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{
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--_size;
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}
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}
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};
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static nrex_char nrex_unescape(nrex_char repr)
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{
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switch (repr)
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{
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case '^': return '^';
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case '$': return '$';
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case '(': return '(';
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case ')': return ')';
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case '\\': return '\\';
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case '.': return '.';
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case '+': return '+';
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case '*': return '*';
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case '?': return '?';
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case '-': return '-';
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case 'a': return '\a';
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case 'e': return '\e';
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case 'f': return '\f';
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case 'n': return '\n';
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case 'r': return '\r';
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case 't': return '\t';
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case 'v': return '\v';
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}
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return 0;
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}
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struct nrex_search
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{
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public:
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const nrex_char* str;
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nrex_result* captures;
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int end;
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bool complete;
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nrex_char at(int pos)
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{
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return str[pos];
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}
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nrex_search(const nrex_char* str, nrex_result* captures)
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: str(str)
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, captures(captures)
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, end(0)
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{
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}
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};
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struct nrex_node
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{
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nrex_node* next;
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nrex_node* previous;
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nrex_node* parent;
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bool quantifiable;
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nrex_node(bool quantify = false)
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: next(NULL)
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, previous(NULL)
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, parent(NULL)
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, quantifiable(quantify)
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{
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}
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virtual ~nrex_node()
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{
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if (next)
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{
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NREX_DELETE(next);
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}
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}
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virtual int test(nrex_search* s, int pos) const
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{
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return next ? next->test(s, pos) : -1;
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}
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virtual int test_parent(nrex_search* s, int pos) const
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{
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if (next)
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{
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pos = next->test(s, pos);
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}
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if (parent && pos >= 0)
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{
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pos = parent->test_parent(s, pos);
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}
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if (pos >= 0)
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{
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s->complete = true;
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}
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return pos;
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}
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};
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struct nrex_node_group : public nrex_node
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{
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int capturing;
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bool negate;
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nrex_array<nrex_node*> childset;
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nrex_node* back;
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nrex_node_group(int capturing)
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: nrex_node(true)
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, capturing(capturing)
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, negate(false)
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, back(NULL)
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{
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}
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virtual ~nrex_node_group()
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{
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for (unsigned int i = 0; i < childset.size(); ++i)
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{
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NREX_DELETE(childset[i]);
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}
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}
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int test(nrex_search* s, int pos) const
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{
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if (capturing >= 0)
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{
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s->captures[capturing].start = pos;
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}
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for (unsigned int i = 0; i < childset.size(); ++i)
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{
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s->complete = false;
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int res = childset[i]->test(s, pos);
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if (s->complete)
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{
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return res;
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}
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if (negate)
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{
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if (res < 0)
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{
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res = pos + 1;
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}
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else
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{
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return -1;
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}
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}
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if (res >= 0)
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{
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if (capturing >= 0)
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{
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s->captures[capturing].length = res - pos;
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}
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return next ? next->test(s, res) : res;
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}
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}
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return -1;
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}
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virtual int test_parent(nrex_search* s, int pos) const
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{
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if (capturing >= 0)
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{
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s->captures[capturing].length = pos - s->captures[capturing].start;
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}
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return nrex_node::test_parent(s, pos);
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}
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void add_childset()
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{
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back = NULL;
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}
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void add_child(nrex_node* node)
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{
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node->parent = this;
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node->previous = back;
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if (back)
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{
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back->next = node;
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}
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else
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{
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childset.push(node);
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}
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back = node;
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}
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nrex_node* swap_back(nrex_node* node)
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{
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if (!back)
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{
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add_child(node);
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return NULL;
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}
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nrex_node* old = back;
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if (!old->previous)
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{
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childset.pop();
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}
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back = old->previous;
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add_child(node);
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return old;
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}
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};
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struct nrex_node_char : public nrex_node
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{
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nrex_char ch;
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nrex_node_char(nrex_char c)
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: nrex_node(true)
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, ch(c)
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{
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}
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int test(nrex_search* s, int pos) const
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{
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if (s->end == pos || s->at(pos) != ch)
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{
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return -1;
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}
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return next ? next->test(s, pos + 1) : pos + 1;
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}
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};
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struct nrex_node_range : public nrex_node
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{
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nrex_char start;
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nrex_char end;
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nrex_node_range(nrex_char s, nrex_char e)
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: nrex_node(true)
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, start(s)
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, end(e)
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{
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}
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int test(nrex_search* s, int pos) const
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{
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if (s->end == pos)
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{
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return -1;
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}
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nrex_char c = s->at(pos);
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if (c < start || end < c)
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{
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return -1;
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}
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return next ? next->test(s, pos + 1) : pos + 1;
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}
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};
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static bool nrex_is_whitespace(nrex_char repr)
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{
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switch (repr)
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{
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case ' ':
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case '\t':
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case '\r':
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case '\n':
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case '\f':
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return true;
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}
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return false;
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}
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static bool nrex_is_shorthand(nrex_char repr)
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{
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switch (repr)
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{
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case 'W':
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case 'w':
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case 'D':
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case 'd':
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case 'S':
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case 's':
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return true;
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}
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return false;
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}
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struct nrex_node_shorthand : public nrex_node
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{
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nrex_char repr;
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nrex_node_shorthand(nrex_char c)
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: nrex_node(true)
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, repr(c)
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{
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}
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int test(nrex_search* s, int pos) const
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{
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if (s->end == pos)
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{
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return -1;
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}
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bool found = false;
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bool invert = false;
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nrex_char c = s->at(pos);
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switch (repr)
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{
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case '.':
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found = true;
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break;
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case 'W':
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invert = true;
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case 'w':
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if (c == '_' || NREX_ISALPHANUM(c))
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{
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found = true;
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}
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break;
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case 'D':
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invert = true;
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case 'd':
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if ('0' <= c && c <= '9')
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{
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found = true;
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}
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break;
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case 'S':
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invert = true;
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case 's':
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if (nrex_is_whitespace(c))
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{
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found = true;
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}
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break;
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}
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if (found == invert)
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{
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return -1;
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}
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return next ? next->test(s, pos + 1) : pos + 1;
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}
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};
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static bool nrex_is_quantifier(nrex_char repr)
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{
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switch (repr)
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{
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case '?':
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case '*':
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case '+':
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case '{':
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return true;
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}
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return false;
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}
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struct nrex_node_quantifier : public nrex_node
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{
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int min;
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int max;
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bool greedy;
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nrex_node* child;
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nrex_node_quantifier()
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: nrex_node()
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, min(0)
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, max(0)
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, greedy(true)
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, child(NULL)
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{
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}
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virtual ~nrex_node_quantifier()
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{
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if (child)
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{
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NREX_DELETE(child);
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}
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}
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int test(nrex_search* s, int pos) const
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{
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nrex_array<int> backtrack;
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backtrack.push(pos);
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while (backtrack.top() <= s->end)
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{
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if (max >= 1 && backtrack.size() > (unsigned int)max)
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{
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break;
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}
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if (!greedy && (unsigned int)min < backtrack.size())
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{
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int res = backtrack.top();
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if (next)
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{
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res = next->test(s, res);
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}
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if (s->complete)
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{
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return res;
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}
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if (res >= 0 && parent->test_parent(s, res) >= 0)
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{
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return res;
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}
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}
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int res = child->test(s, backtrack.top());
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if (s->complete)
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{
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return res;
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}
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if (res < 0 || res == backtrack.top())
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{
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break;
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}
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backtrack.push(res);
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}
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while (greedy && (unsigned int) min < backtrack.size())
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{
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int res = backtrack.top();
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if (next)
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{
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res = next->test(s, res);
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}
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if (res >= 0 && parent->test_parent(s, res) >= 0)
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{
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return res;
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}
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if (s->complete)
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{
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return res;
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}
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backtrack.pop();
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}
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return -1;
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}
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};
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struct nrex_node_anchor : public nrex_node
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{
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bool end;
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nrex_node_anchor(bool end)
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: nrex_node()
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, end(end)
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{
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}
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int test(nrex_search* s, int pos) const
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{
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if (!end && pos != 0)
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{
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return -1;
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}
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else if (end && pos != s->end)
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{
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return -1;
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}
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return next ? next->test(s, pos) : pos;
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}
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};
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struct nrex_node_backreference : public nrex_node
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{
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int ref;
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nrex_node_backreference(int ref)
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: nrex_node(true)
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, ref(ref)
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{
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}
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int test(nrex_search* s, int pos) const
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{
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nrex_result& r = s->captures[ref];
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for (int i = 0; i < r.length; ++i)
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{
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if (pos + i >= s->end)
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{
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return -1;
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}
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if (s->at(r.start + i) != s->at(pos + i))
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{
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return -1;
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}
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}
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return next ? next->test(s, pos + r.length) : pos + r.length;
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}
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};
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nrex::nrex()
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: _capturing(0)
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, _root(NULL)
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{
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}
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nrex::~nrex()
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{
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if (_root)
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{
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NREX_DELETE(_root);
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}
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}
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bool nrex::valid() const
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{
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return (_root != NULL);
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}
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void nrex::reset()
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{
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_capturing = 0;
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if (_root)
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{
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NREX_DELETE(_root);
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}
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_root = NULL;
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}
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int nrex::capture_size() const
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{
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return _capturing + 1;
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}
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bool nrex::compile(const nrex_char* pattern)
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{
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reset();
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nrex_node_group* root = NREX_NEW(nrex_node_group(_capturing));
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nrex_array<nrex_node_group*> stack;
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stack.push(root);
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_root = root;
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for (const nrex_char* c = pattern; c[0] != '\0'; ++c)
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{
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if (c[0] == '(')
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{
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if (c[1] == '?')
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{
|
|
if (c[2] == ':')
|
|
{
|
|
c = &c[2];
|
|
nrex_node_group* group = NREX_NEW(nrex_node_group(-1));
|
|
stack.top()->add_child(group);
|
|
stack.push(group);
|
|
}
|
|
else
|
|
{
|
|
NREX_COMPILE_ERROR("unrecognised qualifier for parenthesis");
|
|
}
|
|
}
|
|
else if (_capturing < 99)
|
|
{
|
|
nrex_node_group* group = NREX_NEW(nrex_node_group(++_capturing));
|
|
stack.top()->add_child(group);
|
|
stack.push(group);
|
|
}
|
|
else
|
|
{
|
|
nrex_node_group* group = NREX_NEW(nrex_node_group(-1));
|
|
stack.top()->add_child(group);
|
|
stack.push(group);
|
|
}
|
|
}
|
|
else if (c[0] == ')')
|
|
{
|
|
if (stack.size() > 1)
|
|
{
|
|
stack.pop();
|
|
}
|
|
else
|
|
{
|
|
NREX_COMPILE_ERROR("unexpected ')'");
|
|
}
|
|
}
|
|
else if (c[0] == '[')
|
|
{
|
|
nrex_node_group* group = NREX_NEW(nrex_node_group(-1));
|
|
stack.top()->add_child(group);
|
|
if (c[1] == '^')
|
|
{
|
|
group->negate = true;
|
|
++c;
|
|
}
|
|
while (true)
|
|
{
|
|
group->add_childset();
|
|
++c;
|
|
if (c[0] == '\0')
|
|
{
|
|
NREX_COMPILE_ERROR("unclosed character class '[]'");
|
|
}
|
|
if (c[0] == ']')
|
|
{
|
|
break;
|
|
}
|
|
else if (c[0] == '\\')
|
|
{
|
|
nrex_char unescaped = nrex_unescape(c[1]);
|
|
if (unescaped)
|
|
{
|
|
group->add_child(NREX_NEW(nrex_node_char(unescaped)));
|
|
++c;
|
|
}
|
|
else if (nrex_is_shorthand(c[1]))
|
|
{
|
|
group->add_child(NREX_NEW(nrex_node_shorthand(c[1])));
|
|
++c;
|
|
}
|
|
else
|
|
{
|
|
NREX_COMPILE_ERROR("escape token not recognised");
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (c[1] == '-' && c[2] != '\0')
|
|
{
|
|
bool range = false;
|
|
if ('A' <= c[0] && c[0] <= 'Z' && 'A' <= c[2] && c[2] <= 'Z')
|
|
{
|
|
range = true;
|
|
}
|
|
if ('a' <= c[0] && c[0] <= 'z' && 'a' <= c[2] && c[2] <= 'z')
|
|
{
|
|
range = true;
|
|
}
|
|
if ('0' <= c[0] && c[0] <= '9' && '0' <= c[2] && c[2] <= '9')
|
|
{
|
|
range = true;
|
|
}
|
|
if (range)
|
|
{
|
|
group->add_child(NREX_NEW(nrex_node_range(c[0], c[2])));
|
|
c = &c[2];
|
|
continue;
|
|
}
|
|
}
|
|
group->add_child(NREX_NEW(nrex_node_char(c[0])));
|
|
}
|
|
|
|
}
|
|
}
|
|
else if (nrex_is_quantifier(c[0]))
|
|
{
|
|
nrex_node_quantifier* quant = NREX_NEW(nrex_node_quantifier);
|
|
quant->child = stack.top()->swap_back(quant);
|
|
if (quant->child == NULL || !quant->child->quantifiable)
|
|
{
|
|
NREX_COMPILE_ERROR("element not quantifiable");
|
|
}
|
|
quant->child->previous = NULL;
|
|
quant->child->next = NULL;
|
|
quant->child->parent = quant;
|
|
if (c[0] == '?')
|
|
{
|
|
quant->min = 0;
|
|
quant->max = 1;
|
|
}
|
|
else if (c[0] == '+')
|
|
{
|
|
quant->min = 1;
|
|
quant->max = -1;
|
|
}
|
|
else if (c[0] == '*')
|
|
{
|
|
quant->min = 0;
|
|
quant->max = -1;
|
|
}
|
|
else if (c[0] == '{')
|
|
{
|
|
bool max_set = false;
|
|
quant->min = 0;
|
|
quant->max = -1;
|
|
while (true)
|
|
{
|
|
++c;
|
|
if (c[0] == '\0')
|
|
{
|
|
NREX_COMPILE_ERROR("unclosed range quantifier '{}'");
|
|
}
|
|
else if (c[0] == '}')
|
|
{
|
|
break;
|
|
}
|
|
else if (c[0] == ',')
|
|
{
|
|
max_set = true;
|
|
continue;
|
|
}
|
|
else if (c[0] < '0' || '9' < c[0])
|
|
{
|
|
NREX_COMPILE_ERROR("expected numeric digits, ',' or '}'");
|
|
}
|
|
if (max_set)
|
|
{
|
|
if (quant->max < 0)
|
|
{
|
|
quant->max = int(c[0] - '0');
|
|
}
|
|
else
|
|
{
|
|
quant->max = quant->max * 10 + int(c[0] - '0');
|
|
}
|
|
}
|
|
else
|
|
{
|
|
quant->min = quant->min * 10 + int(c[0] - '0');
|
|
}
|
|
}
|
|
if (!max_set)
|
|
{
|
|
quant->max = quant->min;
|
|
}
|
|
}
|
|
if (c[1] == '?')
|
|
{
|
|
quant->greedy = false;
|
|
++c;
|
|
}
|
|
}
|
|
else if (c[0] == '|')
|
|
{
|
|
stack.top()->add_childset();
|
|
}
|
|
else if (c[0] == '^' || c[0] == '$')
|
|
{
|
|
stack.top()->add_child(NREX_NEW(nrex_node_anchor((c[0] == '$'))));
|
|
}
|
|
else if (c[0] == '.')
|
|
{
|
|
stack.top()->add_child(NREX_NEW(nrex_node_shorthand('.')));
|
|
}
|
|
else if (c[0] == '\\')
|
|
{
|
|
nrex_char unescaped = nrex_unescape(c[1]);
|
|
if (unescaped)
|
|
{
|
|
stack.top()->add_child(NREX_NEW(nrex_node_char(unescaped)));
|
|
++c;
|
|
}
|
|
else if (nrex_is_shorthand(c[1]))
|
|
{
|
|
stack.top()->add_child(NREX_NEW(nrex_node_shorthand(c[1])));
|
|
++c;
|
|
}
|
|
else if ('1' <= c[1] && c[1] <= '9')
|
|
{
|
|
int ref = 0;
|
|
if ('0' <= c[2] && c[2] <= '9')
|
|
{
|
|
ref = int(c[1] - '0') * 10 + int(c[2] - '0');
|
|
c = &c[2];
|
|
}
|
|
else
|
|
{
|
|
ref = int(c[1] - '0');
|
|
++c;
|
|
}
|
|
if (ref > _capturing)
|
|
{
|
|
NREX_COMPILE_ERROR("backreference to non-existent capture");
|
|
}
|
|
stack.top()->add_child(NREX_NEW(nrex_node_backreference(ref)));
|
|
}
|
|
else
|
|
{
|
|
NREX_COMPILE_ERROR("escape token not recognised");
|
|
}
|
|
}
|
|
else
|
|
{
|
|
stack.top()->add_child(NREX_NEW(nrex_node_char(c[0])));
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool nrex::match(const nrex_char* str, nrex_result* captures, int offset, int end) const
|
|
{
|
|
nrex_search s(str, captures);
|
|
if (end >= offset)
|
|
{
|
|
s.end = end;
|
|
}
|
|
else
|
|
{
|
|
s.end = NREX_STRLEN(str);
|
|
}
|
|
for (int i = offset; i < s.end; ++i)
|
|
{
|
|
for (int c = 0; c <= _capturing; ++c)
|
|
{
|
|
captures[c].start = 0;
|
|
captures[c].length = 0;
|
|
}
|
|
if (_root->test(&s, i) >= 0)
|
|
{
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|