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118 lines
3.0 KiB
118 lines
3.0 KiB
/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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file Copyright.txt or https://cmake.org/licensing for details. */
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#include "cmExprParserHelper.h"
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#include <iostream>
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#include <sstream>
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#include <stdexcept>
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#include <utility>
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#include "cmExprLexer.h"
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#include "cmStringAlgorithms.h"
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int cmExpr_yyparse(yyscan_t yyscanner);
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//
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cmExprParserHelper::cmExprParserHelper()
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{
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this->FileLine = -1;
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this->FileName = nullptr;
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this->Result = 0;
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}
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cmExprParserHelper::~cmExprParserHelper() = default;
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int cmExprParserHelper::ParseString(const char* str, int verb)
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{
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if (!str) {
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return 0;
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}
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// printf("Do some parsing: %s\n", str);
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this->Verbose = verb;
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this->InputBuffer = str;
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this->InputBufferPos = 0;
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this->CurrentLine = 0;
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this->Result = 0;
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yyscan_t yyscanner;
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cmExpr_yylex_init(&yyscanner);
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cmExpr_yyset_extra(this, yyscanner);
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try {
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int res = cmExpr_yyparse(yyscanner);
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if (res != 0) {
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std::string e = cmStrCat("cannot parse the expression: \"", InputBuffer,
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"\": ", ErrorString, '.');
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this->SetError(std::move(e));
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}
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} catch (std::runtime_error const& fail) {
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std::string e = cmStrCat("cannot evaluate the expression: \"", InputBuffer,
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"\": ", fail.what(), '.');
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this->SetError(std::move(e));
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} catch (std::out_of_range const&) {
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std::string e = "cannot evaluate the expression: \"" + InputBuffer +
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"\": a numeric value is out of range.";
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this->SetError(std::move(e));
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} catch (...) {
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std::string e = "cannot parse the expression: \"" + InputBuffer + "\".";
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this->SetError(std::move(e));
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}
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cmExpr_yylex_destroy(yyscanner);
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if (!this->ErrorString.empty()) {
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return 0;
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}
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if (Verbose) {
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std::cerr << "Expanding [" << str << "] produced: [" << this->Result << "]"
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<< std::endl;
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}
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return 1;
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}
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int cmExprParserHelper::LexInput(char* buf, int maxlen)
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{
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// std::cout << "JPLexInput ";
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// std::cout.write(buf, maxlen);
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// std::cout << std::endl;
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if (maxlen < 1) {
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return 0;
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}
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if (this->InputBufferPos < this->InputBuffer.size()) {
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buf[0] = this->InputBuffer[this->InputBufferPos++];
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if (buf[0] == '\n') {
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this->CurrentLine++;
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}
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return (1);
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}
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buf[0] = '\n';
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return (0);
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}
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void cmExprParserHelper::Error(const char* str)
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{
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unsigned long pos = static_cast<unsigned long>(this->InputBufferPos);
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std::ostringstream ostr;
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ostr << str << " (" << pos << ")";
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this->ErrorString = ostr.str();
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}
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void cmExprParserHelper::UnexpectedChar(char c)
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{
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unsigned long pos = static_cast<unsigned long>(this->InputBufferPos);
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std::ostringstream ostr;
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ostr << "Unexpected character in expression at position " << pos << ": " << c
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<< "\n";
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this->WarningString += ostr.str();
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}
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void cmExprParserHelper::SetResult(KWIML_INT_int64_t value)
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{
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this->Result = value;
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}
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void cmExprParserHelper::SetError(std::string errorString)
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{
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this->ErrorString = std::move(errorString);
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}
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