119 lines
3.3 KiB
C++
119 lines
3.3 KiB
C++
/**
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roflcat
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Copyright (C) 2019 rexy712
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef PRINTER_BASE_TPP
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#define PRINTER_BASE_TPP
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#include "printer_base.hpp"
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#include "cmd.hpp"
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#include <utility> //std::declval
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#ifndef _XOPEN_SOURCE
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#define _XOPEN_SOURCE //wcwidth
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#endif
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#include <cwchar> //wcwidth
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#include <cstdio> //wprintf, putwchar
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#include <cstdlib> //mbstowcs
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template<class Derived>
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constexpr printer_base<Derived>::printer_base(const wchar_t* tabstr, const cmd_args& args)noexcept:
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m_show_ends(args.ends),
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m_print_ln(args.number),
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m_squeeze_blank(args.squeeze),
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m_tab_str(tabstr),
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m_tab_size(wcslen(tabstr)){}
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template<class Derived>
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auto printer_base<Derived>::print(wchar_t s)noexcept(noexcept(std::declval<Derived>()._print(s))) -> Derived&{
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Derived& dv = static_cast<Derived&>(*this);
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//suppress repeated blank lines
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if(m_squeeze_blank){
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//if 2 newlines in a row
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if(m_newline && s == L'\n'){
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if(m_squeeze_cnt == 0){
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//don't suppress the first blank line
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++m_squeeze_cnt;
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}else{
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return dv;
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}
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}else{
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m_squeeze_cnt = 0;
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}
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}
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//if we want to print line numbers and our last char was a newline
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if(m_print_ln != PRINT_LINE_NEVER && m_newline){
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//if we want to print always or if we want nonblanks and last char wasn't a newline (ie nonblank)
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if(m_print_ln == PRINT_LINE_ALWAYS || s != L'\n'){
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m_newline = false;
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wchar_t buffer[24]; //excessive
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swprintf(buffer, sizeof(buffer)/sizeof(buffer[0])-1, L"%" LINE_NUMBERING_SPACE "d", m_line_num++);
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for(wchar_t* c = buffer;*c != 0;++c){
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dv._print(*c);
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}
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dv._print(L' ');
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}
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}
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//update status of last character
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if(s == L'\n'){
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m_newline = true;
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if(m_show_ends)
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dv._print(L'$');
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}else{
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m_newline = false;
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}
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//tabs character can be changed with the -T switch, so treat it special
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if(s == L'\t'){
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for(size_t i = 0;i < m_tab_size;++i){
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dv._print(m_tab_str[i]);
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}
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}else{
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dv._print(s);
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}
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return dv;
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}
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template<class Derived>
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auto printer_base<Derived>::print(const wchar_t* s)noexcept(noexcept(std::declval<printer_base<Derived>>().print(std::declval<wchar_t>()))) -> Derived&{
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for(;*s != 0;++s){
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print(*s);
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}
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return static_cast<Derived&>(*this);
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}
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template<class Derived>
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auto printer_base<Derived>::print(char s) -> Derived&{
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return print(static_cast<wchar_t>(s));
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}
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template<class Derived>
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auto printer_base<Derived>::print(const char* s) -> Derived&{
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for(;*s != 0;++s){
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print(*s);
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}
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return static_cast<Derived&>(*this);
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}
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template<class Derived>
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auto printer_base<Derived>::reset(void) -> Derived&{
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if constexpr(HAS_FUNC(_reset)<Derived,Derived&>::value){
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return static_cast<Derived&>(*this)._reset();
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}else{
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return static_cast<Derived&>(*this);
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}
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}
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#endif
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