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/***********************************************/
/**
* @file stringParser.cpp
*
* @brief string manipulation parser
*
* @author Torsten Mayer-Guerr
* @author Sebastian Strasser
* @date 2016-03-26
*
*/
/***********************************************/
#include "base/importStd.h"
#include "base/constants.h"
#include "stringParser.h"
#include "expressionParser.h"
#include <regex>
/***********************************************/
static std::string parseUntil(const std::string &text, const char *search, const VariableList &varList, std::string::size_type &pos, Bool &resolved);
static std::string parseVariable(const std::string &text, const VariableList &varList, std::string::size_type &pos, Bool &resolved);
/***********************************************/
std::string parseUntil(const std::string &text, const char *search, const VariableList &varList, std::string::size_type &pos, Bool &resolved)
{
std::string textPart;
for(;;)
{
std::string::size_type posOld = pos;
pos = text.find_first_of(search, pos);
textPart += text.substr(posOld, pos-posOld);
if((pos != std::string::npos) && (pos > 1) && (text.at(pos-1) == '#')) // escape '#' before?
textPart.back() = text.at(pos++); // replace '#' by excapted character
else if((pos != std::string::npos) && (text.at(pos) == '{'))
textPart += parseVariable(text, varList, ++pos, resolved);
else
break;
}
return textPart;
}
/***********************************************/
// parse after '{'
static std::string parseVariable(const std::string &text, const VariableList &varList, std::string::size_type &pos, Bool &resolved)
{
Bool resolvedVar = TRUE;
std::string textPart = parseUntil(text, "{:/}", varList, pos, resolvedVar);
if(pos == std::string::npos)
throw(Exception("missing closing '}'"));
auto c = text.at(pos++);
// textPart is variable
// --------------------
if(c == '}')
{
auto variable = varList.find(textPart);
if(variable && resolvedVar)
return variable->getParsedText(varList, resolved);
resolved = FALSE;
return '{'+textPart+'}';
}
// textPart is {expression:format}
// -------------------------------
if(c == ':')
{
// format string
std::string format = parseUntil(text, "{}", varList, pos, resolvedVar);
if(pos++ == std::string::npos)
throw(Exception("missing closing '}' of {expression:format}"));
if(resolvedVar)
{
try {return ExpressionVariable::parse(textPart, varList) % format;} // parse expression -> caluclate new result string
catch(std::exception &/*e*/) {}
}
resolved = FALSE;
return "{"+textPart+":"+format+"}";
}
// regex expression {text/regex/replace}
// -------------------------------------
if(c == '/')
{
std::string regexText = parseUntil(text, "{/", varList, pos, resolvedVar);
if(pos++ == std::string::npos)
throw(Exception("missing second '/' of {text/regex/replace}"));
std::string replace = parseUntil(text, "{}", varList, pos, resolvedVar);
if(pos++ == std::string::npos)
throw(Exception("missing closing '}' of {text/regex/replace}"));
if(!resolvedVar)
{
resolved = FALSE;
return '{'+textPart+'/'+regexText+'/'+replace+'}';
}
// Escape sequences
// \l lowercase next char
// \u uppercase next char
// \L lowercase until \E
// \U uppercase until \E
// \Q quote (disable) pattern metacharacters until \E
// \E end either case modification or quoted section
std::regex regex(regexText);
std::string result;
std::string::size_type posReplace = 0;
Char c = 'E'; // end: normal mode
for(;;)
{
std::string::size_type posOld = posReplace;
posReplace = replace.find('\\', posOld);
if(c != 'Q')
{
std::string resultPart = std::regex_replace(textPart, regex, replace.substr(posOld, posReplace-posOld));
if(c == 'L') std::for_each(resultPart.begin(), resultPart.end(), [](auto &c){c=std::tolower(c);});
if(c == 'U') std::for_each(resultPart.begin(), resultPart.end(), [](auto &c){c=std::toupper(c);});
if(c == 'l' && !resultPart.empty()) resultPart.front() = std::tolower(resultPart.front());
if(c == 'u' && !resultPart.empty()) resultPart.front() = std::toupper(resultPart.front());
result += resultPart;
}
else
result += replace.substr(posOld, posReplace-posOld);
if(posReplace++ == std::string::npos) return result; // end of string
auto cNew = (posReplace < replace.size()) ? replace.at(posReplace) : ' ';
if(((c != 'Q') && ((cNew == 'L') || (cNew == 'U') || (cNew == 'l') || (cNew == 'u') || (cNew == 'Q'))) || // not in quote mode -> accept Q,L,U,l,u
((c != 'E') && (cNew == 'E'))) // not in normal mode -> accept additionally E
c = replace.at(posReplace++);
else
result += "\\";
}
return result;
}
throw(Exception("unknown error"));
}
/***********************************************/
std::string StringParser::parse(const std::string &name, const std::string &text, const VariableList &varList, Bool &resolved)
{
std::string result;
std::string::size_type pos = 0;
try
{
return parseUntil(text, "{", varList, pos, resolved);
}
catch(std::exception &e)
{
throw(Exception("Parser error in ("+name+"='"+text+"'), column="+(pos%"%i"s)+":\n"+e.what()));
}
}
/***********************************************/
std::string StringParser::parse(const std::string &text, const VariableList &varList)
{
try
{
Bool resolved = TRUE;
std::string result = parse("(unknown)", text, varList, resolved);
if(!resolved)
throw(Exception("unresolved variables"));
return result;
}
catch(std::exception &e)
{
throw(Exception("Parser error in '"+text+"'\n"+e.what()));
}
}
/***********************************************/
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