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421 lines
11 KiB
C++
421 lines
11 KiB
C++
#include "scanscalar.h"
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#include "scanner.h"
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#include "exp.h"
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#include "exceptions.h"
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#include "token.h"
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namespace YAML
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{
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//////////////////////////////////////////////////////////
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// WhitespaceInfo
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WhitespaceInfo::WhitespaceInfo(): leadingBlanks(false), fold(true), chomp(0), increment(0)
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{
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}
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void WhitespaceInfo::SetChompers(char ch)
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{
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if(ch == '+')
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chomp = 1;
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else if(ch == '-')
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chomp = -1;
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else if(Exp::Digit.Matches(ch)) {
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increment = ch - '0';
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if(increment == 0)
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throw ZeroIndentationInBlockScalar();
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}
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}
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void WhitespaceInfo::AddBlank(char ch)
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{
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if(!leadingBlanks)
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whitespace += ch;
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}
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void WhitespaceInfo::AddBreak(const std::string& line)
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{
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// where to store this character?
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if(!leadingBlanks) {
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leadingBlanks = true;
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whitespace = "";
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leadingBreaks += line;
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} else
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trailingBreaks += line;
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}
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std::string WhitespaceInfo::Join(bool lastLine)
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{
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std::string ret;
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if(leadingBlanks) {
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// fold line break?
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if(fold && Exp::Break.Matches(leadingBreaks) && trailingBreaks.empty() && !lastLine)
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ret = " ";
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else if(!lastLine || chomp != -1)
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ret = leadingBreaks;
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if(!lastLine || chomp == 1)
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ret += trailingBreaks;
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leadingBlanks = false;
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leadingBreaks = "";
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trailingBreaks = "";
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} else if(!whitespace.empty()) {
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ret = whitespace;
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whitespace = "";
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}
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return ret;
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}
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// PlainScalarToken
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// . We scan these in passes of two steps each: First, grab all non-whitespace
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// characters we can, and then grab all whitespace characters we can.
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// . This has the benefit of letting us handle leading whitespace (which is chomped)
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// and in-line whitespace (which is kept) separately.
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template <> PlainScalarToken *Scanner::ScanToken(PlainScalarToken *pToken)
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{
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//// now eat and store the scalar
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//std::string scalar;
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//WhitespaceInfo info;
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//while(INPUT) {
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// // doc start/end tokens
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// if(IsDocumentStart() || IsDocumentEnd())
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// break;
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// // comment
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// if(Exp::Comment.Matches(INPUT))
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// break;
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// // first eat non-blanks
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// while(INPUT && !Exp::BlankOrBreak.Matches(INPUT)) {
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// // illegal colon in flow context
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// if(m_flowLevel > 0 && Exp::IllegalColonInScalar.Matches(INPUT))
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// throw IllegalScalar();
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// // characters that might end the scalar
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// if(m_flowLevel > 0 && Exp::EndScalarInFlow.Matches(INPUT))
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// break;
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// if(m_flowLevel == 0 && Exp::EndScalar.Matches(INPUT))
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// break;
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// // finally, read the character!
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// scalar += GetChar();
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// }
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// // did we hit a non-blank character that ended us?
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// if(!Exp::BlankOrBreak.Matches(INPUT))
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// break;
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// // now eat blanks
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// while(INPUT && Exp::BlankOrBreak.Matches(INPUT)) {
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// if(Exp::Blank.Matches(INPUT)) {
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// // can't use tabs as indentation! only spaces!
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// if(INPUT.peek() == '\t' && info.leadingBlanks && m_column <= m_indents.top())
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// throw IllegalTabInScalar();
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// info.AddBlank(GetChar());
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// } else {
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// // we know it's a line break; see how many characters to read
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// int n = Exp::Break.Match(INPUT);
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// std::string line = GetChar(n);
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// info.AddBreak(line);
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// // and we can't continue a simple key to the next line
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// ValidateSimpleKey();
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// }
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// }
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// // break if we're below the indentation level
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// if(m_flowLevel == 0 && m_column <= m_indents.top())
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// break;
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// // finally join whitespace
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// scalar += info.Join();
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//}
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RegEx end = (m_flowLevel > 0 ? Exp::EndScalarInFlow : Exp::EndScalar) || (RegEx(' ') + Exp::Comment);
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int indent = (m_flowLevel > 0 ? 0 : m_indents.top() + 1);
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// insert a potential simple key
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if(m_simpleKeyAllowed)
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InsertSimpleKey();
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pToken->value = ScanScalar(INPUT, end, false, indent, 0, true, true, true, 0);
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m_simpleKeyAllowed = false;
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if(true/*info.leadingBlanks*/)
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m_simpleKeyAllowed = true;
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return pToken;
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}
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// QuotedScalarToken
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template <> QuotedScalarToken *Scanner::ScanToken(QuotedScalarToken *pToken)
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{
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//// now eat and store the scalar
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//std::string scalar;
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//WhitespaceInfo info;
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//while(INPUT) {
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// if(IsDocumentStart() || IsDocumentEnd())
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// throw DocIndicatorInQuote();
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// if(INPUT.peek() == EOF)
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// throw EOFInQuote();
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// // first eat non-blanks
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// while(INPUT && !Exp::BlankOrBreak.Matches(INPUT)) {
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// // escaped single quote?
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// if(pToken->single && Exp::EscSingleQuote.Matches(INPUT)) {
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// int n = Exp::EscSingleQuote.Match(INPUT);
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// scalar += GetChar(n);
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// continue;
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// }
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// // is the quote ending?
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// if(INPUT.peek() == quote)
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// break;
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// // escaped newline?
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// if(Exp::EscBreak.Matches(INPUT))
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// break;
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// // other escape sequence
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// if(INPUT.peek() == '\\') {
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// int length = 0;
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// scalar += Exp::Escape(INPUT, length);
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// m_column += length;
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// continue;
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// }
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// // and finally, just add the damn character
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// scalar += GetChar();
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// }
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// // is the quote ending?
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// if(INPUT.peek() == quote) {
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// // eat and go
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// GetChar();
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// break;
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// }
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// // now we eat blanks
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// while(Exp::BlankOrBreak.Matches(INPUT)) {
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// if(Exp::Blank.Matches(INPUT)) {
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// info.AddBlank(GetChar());
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// } else {
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// // we know it's a line break; see how many characters to read
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// int n = Exp::Break.Match(INPUT);
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// std::string line = GetChar(n);
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// info.AddBreak(line);
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// // and we can't continue a simple key to the next line
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// ValidateSimpleKey();
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// }
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// }
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// // and finally join the whitespace
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// scalar += info.Join();
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//}
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// eat single or double quote
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char quote = INPUT.GetChar();
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pToken->single = (quote == '\'');
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RegEx end = (pToken->single ? RegEx(quote) && !Exp::EscSingleQuote : RegEx(quote));
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char escape = (pToken->single ? '\'' : '\\');
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// insert a potential simple key
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if(m_simpleKeyAllowed)
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InsertSimpleKey();
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pToken->value = ScanScalar(INPUT, end, true, 0, escape, true, true, false, 0);
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m_simpleKeyAllowed = false;
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return pToken;
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}
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// BlockScalarToken
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template <> BlockScalarToken *Scanner::ScanToken(BlockScalarToken *pToken)
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{
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WhitespaceInfo info;
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// eat block indicator ('|' or '>')
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char indicator = INPUT.GetChar();
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info.fold = (indicator == Keys::FoldedScalar);
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// eat chomping/indentation indicators
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int n = Exp::Chomp.Match(INPUT);
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for(int i=0;i<n;i++)
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info.SetChompers(INPUT.GetChar());
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// first eat whitespace
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while(Exp::Blank.Matches(INPUT))
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INPUT.Eat(1);
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// and comments to the end of the line
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if(Exp::Comment.Matches(INPUT))
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while(INPUT && !Exp::Break.Matches(INPUT))
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INPUT.Eat(1);
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// if it's not a line break, then we ran into a bad character inline
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if(INPUT && !Exp::Break.Matches(INPUT))
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throw UnexpectedCharacterInBlockScalar();
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// and eat that baby
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INPUT.EatLineBreak();
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// set the initial indentation
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int indent = info.increment;
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if(info.increment && m_indents.top() >= 0)
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indent += m_indents.top();
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GetBlockIndentation(INPUT, indent, info.trailingBreaks, m_indents.top());
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bool eatLeadingWhitespace = false;
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pToken->value = ScanScalar(INPUT, RegEx(), false, indent, 0, info.fold, eatLeadingWhitespace, false, info.chomp);
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// simple keys always ok after block scalars (since we're gonna start a new line anyways)
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m_simpleKeyAllowed = true;
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return pToken;
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}
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// GetBlockIndentation
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// . Helper to scanning a block scalar.
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// . Eats leading *indentation* zeros (i.e., those that come before 'indent'),
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// and updates 'indent' (if it hasn't been set yet).
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void GetBlockIndentation(Stream& INPUT, int& indent, std::string& breaks, int topIndent)
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{
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int maxIndent = 0;
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while(1) {
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// eat as many indentation spaces as we can
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while((indent == 0 || INPUT.column < indent) && INPUT.peek() == ' ')
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INPUT.Eat(1);
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if(INPUT.column > maxIndent)
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maxIndent = INPUT.column;
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// do we need more indentation, but we've got a tab?
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if((indent == 0 || INPUT.column < indent) && INPUT.peek() == '\t')
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throw IllegalTabInScalar(); // TODO: are literal scalar lines allowed to have tabs here?
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// is this a non-empty line?
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if(!Exp::Break.Matches(INPUT))
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break;
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// otherwise, eat the line break and move on
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int n = Exp::Break.Match(INPUT);
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breaks += INPUT.GetChar(n);
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}
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// finally, set the indentation
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if(indent == 0) {
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indent = maxIndent;
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if(indent < topIndent + 1)
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indent = topIndent + 1;
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if(indent < 1)
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indent = 1;
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}
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}
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// ScanScalar
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std::string ScanScalar(Stream& INPUT, RegEx end, bool eatEnd, int indent, char escape, bool fold, bool eatLeadingWhitespace, bool trimTrailingSpaces, int chomp)
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{
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bool emptyLine = false, moreIndented = false;
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std::string scalar;
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while(INPUT) {
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// ********************************
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// Phase #1: scan until line ending
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while(!end.Matches(INPUT) && !Exp::Break.Matches(INPUT)) {
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if(INPUT.peek() == EOF)
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break;
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// escaped newline? (only if we're escaping on slash)
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if(escape == '\\' && Exp::EscBreak.Matches(INPUT)) {
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int n = Exp::EscBreak.Match(INPUT);
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INPUT.Eat(n);
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continue;
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}
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// escape this?
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if(INPUT.peek() == escape) {
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scalar += Exp::Escape(INPUT);
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continue;
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}
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// otherwise, just add the damn character
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scalar += INPUT.GetChar();
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}
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// eof? if we're looking to eat something, then we throw
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if(INPUT.peek() == EOF) {
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if(eatEnd)
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throw EOFInQuote();
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break;
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}
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// are we done via character match?
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int n = end.Match(INPUT);
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if(n >= 0) {
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if(eatEnd)
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INPUT.Eat(n);
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break;
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}
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// ********************************
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// Phase #2: eat line ending
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n = Exp::Break.Match(INPUT);
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INPUT.Eat(n);
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// ********************************
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// Phase #3: scan initial spaces
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// first the required indentation
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while(INPUT.peek() == ' ' && INPUT.column < indent)
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INPUT.Eat(1);
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// and then the rest of the whitespace
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if(eatLeadingWhitespace) {
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while(Exp::Blank.Matches(INPUT))
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INPUT.Eat(1);
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}
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// was this an empty line?
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bool nextEmptyLine = Exp::Break.Matches(INPUT);
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bool nextMoreIndented = (INPUT.peek() == ' ');
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if(fold && !emptyLine && !nextEmptyLine && !moreIndented && !nextMoreIndented)
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scalar += " ";
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else
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scalar += "\n";
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emptyLine = nextEmptyLine;
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moreIndented = nextMoreIndented;
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// are we done via indentation?
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if(!emptyLine && INPUT.column < indent)
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break;
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}
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// post-processing
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if(trimTrailingSpaces) {
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unsigned pos = scalar.find_last_not_of(' ');
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if(pos < scalar.size())
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scalar.erase(pos + 1);
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}
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if(chomp <= 0) {
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unsigned pos = scalar.find_last_not_of('\n');
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if(chomp == 0 && pos + 1 < scalar.size())
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scalar.erase(pos + 2);
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else if(chomp == -1 && pos < scalar.size())
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scalar.erase(pos + 1);
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}
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return scalar;
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}
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}
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