diff options
Diffstat (limited to 'src/libs/3rdparty/yaml-cpp/src/scanscalar.cpp')
-rw-r--r-- | src/libs/3rdparty/yaml-cpp/src/scanscalar.cpp | 250 |
1 files changed, 250 insertions, 0 deletions
diff --git a/src/libs/3rdparty/yaml-cpp/src/scanscalar.cpp b/src/libs/3rdparty/yaml-cpp/src/scanscalar.cpp new file mode 100644 index 0000000000..10e359d446 --- /dev/null +++ b/src/libs/3rdparty/yaml-cpp/src/scanscalar.cpp @@ -0,0 +1,250 @@ +#include "scanscalar.h" + +#include <algorithm> + +#include "exp.h" +#include "regeximpl.h" +#include "stream.h" +#include "yaml-cpp/exceptions.h" // IWYU pragma: keep + +namespace YAML { +// ScanScalar +// . This is where the scalar magic happens. +// +// . We do the scanning in three phases: +// 1. Scan until newline +// 2. Eat newline +// 3. Scan leading blanks. +// +// . Depending on the parameters given, we store or stop +// and different places in the above flow. +std::string ScanScalar(Stream& INPUT, ScanScalarParams& params) { + bool foundNonEmptyLine = false; + bool pastOpeningBreak = (params.fold == FOLD_FLOW); + bool emptyLine = false, moreIndented = false; + int foldedNewlineCount = 0; + bool foldedNewlineStartedMoreIndented = false; + std::size_t lastEscapedChar = std::string::npos; + std::string scalar; + params.leadingSpaces = false; + + if (!params.end) { + params.end = &Exp::Empty(); + } + + while (INPUT) { + // ******************************** + // Phase #1: scan until line ending + + std::size_t lastNonWhitespaceChar = scalar.size(); + bool escapedNewline = false; + while (!params.end->Matches(INPUT) && !Exp::Break().Matches(INPUT)) { + if (!INPUT) { + break; + } + + // document indicator? + if (INPUT.column() == 0 && Exp::DocIndicator().Matches(INPUT)) { + if (params.onDocIndicator == BREAK) { + break; + } else if (params.onDocIndicator == THROW) { + throw ParserException(INPUT.mark(), ErrorMsg::DOC_IN_SCALAR); + } + } + + foundNonEmptyLine = true; + pastOpeningBreak = true; + + // escaped newline? (only if we're escaping on slash) + if (params.escape == '\\' && Exp::EscBreak().Matches(INPUT)) { + // eat escape character and get out (but preserve trailing whitespace!) + INPUT.get(); + lastNonWhitespaceChar = scalar.size(); + lastEscapedChar = scalar.size(); + escapedNewline = true; + break; + } + + // escape this? + if (INPUT.peek() == params.escape) { + scalar += Exp::Escape(INPUT); + lastNonWhitespaceChar = scalar.size(); + lastEscapedChar = scalar.size(); + continue; + } + + // otherwise, just add the damn character + char ch = INPUT.get(); + scalar += ch; + if (ch != ' ' && ch != '\t') { + lastNonWhitespaceChar = scalar.size(); + } + } + + // eof? if we're looking to eat something, then we throw + if (!INPUT) { + if (params.eatEnd) { + throw ParserException(INPUT.mark(), ErrorMsg::EOF_IN_SCALAR); + } + break; + } + + // doc indicator? + if (params.onDocIndicator == BREAK && INPUT.column() == 0 && + Exp::DocIndicator().Matches(INPUT)) { + break; + } + + // are we done via character match? + int n = params.end->Match(INPUT); + if (n >= 0) { + if (params.eatEnd) { + INPUT.eat(n); + } + break; + } + + // do we remove trailing whitespace? + if (params.fold == FOLD_FLOW) + scalar.erase(lastNonWhitespaceChar); + + // ******************************** + // Phase #2: eat line ending + n = Exp::Break().Match(INPUT); + INPUT.eat(n); + + // ******************************** + // Phase #3: scan initial spaces + + // first the required indentation + while (INPUT.peek() == ' ' && + (INPUT.column() < params.indent || + (params.detectIndent && !foundNonEmptyLine)) && + !params.end->Matches(INPUT)) { + INPUT.eat(1); + } + + // update indent if we're auto-detecting + if (params.detectIndent && !foundNonEmptyLine) { + params.indent = std::max(params.indent, INPUT.column()); + } + + // and then the rest of the whitespace + while (Exp::Blank().Matches(INPUT)) { + // we check for tabs that masquerade as indentation + if (INPUT.peek() == '\t' && INPUT.column() < params.indent && + params.onTabInIndentation == THROW) { + throw ParserException(INPUT.mark(), ErrorMsg::TAB_IN_INDENTATION); + } + + if (!params.eatLeadingWhitespace) { + break; + } + + if (params.end->Matches(INPUT)) { + break; + } + + INPUT.eat(1); + } + + // was this an empty line? + bool nextEmptyLine = Exp::Break().Matches(INPUT); + bool nextMoreIndented = Exp::Blank().Matches(INPUT); + if (params.fold == FOLD_BLOCK && foldedNewlineCount == 0 && nextEmptyLine) + foldedNewlineStartedMoreIndented = moreIndented; + + // for block scalars, we always start with a newline, so we should ignore it + // (not fold or keep) + if (pastOpeningBreak) { + switch (params.fold) { + case DONT_FOLD: + scalar += "\n"; + break; + case FOLD_BLOCK: + if (!emptyLine && !nextEmptyLine && !moreIndented && + !nextMoreIndented && INPUT.column() >= params.indent) { + scalar += " "; + } else if (nextEmptyLine) { + foldedNewlineCount++; + } else { + scalar += "\n"; + } + + if (!nextEmptyLine && foldedNewlineCount > 0) { + scalar += std::string(foldedNewlineCount - 1, '\n'); + if (foldedNewlineStartedMoreIndented || + nextMoreIndented | !foundNonEmptyLine) { + scalar += "\n"; + } + foldedNewlineCount = 0; + } + break; + case FOLD_FLOW: + if (nextEmptyLine) { + scalar += "\n"; + } else if (!emptyLine && !nextEmptyLine && !escapedNewline) { + scalar += " "; + } + break; + } + } + + emptyLine = nextEmptyLine; + moreIndented = nextMoreIndented; + pastOpeningBreak = true; + + // are we done via indentation? + if (!emptyLine && INPUT.column() < params.indent) { + params.leadingSpaces = true; + break; + } + } + + // post-processing + if (params.trimTrailingSpaces) { + std::size_t pos = scalar.find_last_not_of(' '); + if (lastEscapedChar != std::string::npos) { + if (pos < lastEscapedChar || pos == std::string::npos) { + pos = lastEscapedChar; + } + } + if (pos < scalar.size()) { + scalar.erase(pos + 1); + } + } + + switch (params.chomp) { + case CLIP: { + std::size_t pos = scalar.find_last_not_of('\n'); + if (lastEscapedChar != std::string::npos) { + if (pos < lastEscapedChar || pos == std::string::npos) { + pos = lastEscapedChar; + } + } + if (pos == std::string::npos) { + scalar.erase(); + } else if (pos + 1 < scalar.size()) { + scalar.erase(pos + 2); + } + } break; + case STRIP: { + std::size_t pos = scalar.find_last_not_of('\n'); + if (lastEscapedChar != std::string::npos) { + if (pos < lastEscapedChar || pos == std::string::npos) { + pos = lastEscapedChar; + } + } + if (pos == std::string::npos) { + scalar.erase(); + } else if (pos < scalar.size()) { + scalar.erase(pos + 1); + } + } break; + default: + break; + } + + return scalar; +} +} |