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SaxParser.cpp
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334 lines (290 loc) · 10.7 KB
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#include "SaxParser.h"
namespace xml {
namespace sax {
// http://www.w3.org/TR/REC-xml/
void Parser::tagNameAdd(char s)
{
tagName.push_back(s);
};
static std::string const S = " \t\n\r";
static std::string const NameStartChar = "a-zA-Z_:";
Parser::Parser():
startDocFn([](TagType const & name, AttributeIterator & it){}),
endDocFn([](TagType const & name){}),
startElementFn([](TagType const & name, AttributeIterator & it){}),
charactersFn([](CharIterator & it){}),
endElementFn([](TagType const & name){}),
procInstrFn([](TagType const & processingInstruction, std::string const & arguments){}),
elementFn([](TagType const & processingInstruction, std::string const & arguments){})
{
auto limpaTag = [this](char s){ tagName.clear(); };
auto limpaBuffer = [this](char s){ buffer.clear(); };
auto geraStartTag = [this](char s){
event_state = start_tag;
buffer.clear();
};
auto geraEndTag = [this](char s){
event_state = end_tag;
};
using namespace std;
auto addTagName = bind1st(mem_fun(&Parser::tagNameAdd),this);
using namespace automata;
RangeSetter<char,MealyTransition> rs(parserAut);
typedef decltype(parserAut) Automata;
rs.setTrans("start",S,"start");
parserAut.setTrans("start",'<',"tagStart").output = limpaTag;
// <?
parserAut.setTrans("tagStart",'?',"pi");
rs.setTrans("pi",S,"piS",limpaBuffer);
parserAut.getNode("pi").defaultTransition = [this](char ch) -> Automata::NodeType * {
tagNameAdd(ch);
return &parserAut.getNode("pi");
};
rs.setTrans("piS",S,"piS");
parserAut.setTrans("piS",'?',"fimPi1");
parserAut.getNode("piS").defaultTransition = [this](char ch) -> Automata::NodeType * {
buffer.push_back(ch);
return &parserAut.getNode("piChars");
};
parserAut.getNode("piChars").defaultTransition = parserAut.getNode("piS").defaultTransition;
parserAut.setTrans("piChars",'?',"fimPi1");
parserAut.setTrans("fimPi1",'>',"start").output = [this](char s){ event_state = processing_instruction; };
// <! elements (doctype) e cdata
parserAut.setTrans("tagStart",'!',"!");
// comentario
parserAut.setTrans("!",'-',"commentS");
parserAut.setTrans("commentS",'-',"comment");
parserAut.getNode("comment").defaultTransition = [this](char ch) -> Automata::NodeType * {
return &parserAut.getNode("comment");
};
parserAut.setTrans("comment",'-',"commentHyphen");
parserAut.getNode("commentHyphen").defaultTransition = parserAut.getNode("comment").defaultTransition;
parserAut.setTrans("commentHyphen",'-',"commentEnd");
parserAut.setTrans("commentEnd",'>',"start");
// element
rs.setTrans("!",NameStartChar,"element",[this](char s){ tagName = s; });
parserAut.getNode("element").defaultTransition = [this](char ch) -> Automata::NodeType * {
tagNameAdd(ch);
return &parserAut.getNode("element");
};
rs.setTrans("element",S,"elementText",limpaBuffer);
parserAut.getNode("elementText").defaultTransition = [this](char ch) -> Automata::NodeType * {
buffer.push_back(ch);
return &parserAut.getNode("elementText");
};
parserAut.setTrans("elementText",'>',"start").output = [this](char s){ event_state = element_notation; };
// cdata like
parserAut.setTrans("!",'[',"{
event_state = special_element;
buffer.clear();
};
parserAut.getNode(" -> Automata::NodeType * {
tagNameAdd(ch);
return &parserAut.getNode(" -> Automata::NodeType * {
return &parserAut.getNode("element[");
};
auto specialElementEndingFn = [this](char s){
event_state = special_element_ending;
buffer.push_back(']');
};
parserAut.setTrans("element[",']',"endElement]").output = specialElementEndingFn;
parserAut.setTrans("endElement]",']',"endElement]]").output = specialElementEndingFn;
parserAut.setTrans("endElement]]",']',"endElement]]").output = specialElementEndingFn;
parserAut.setTrans("endElement]]",'>',"start").output = [this](char s){
event_state = special_element_end;
buffer.resize(buffer.size()-2);
};
parserAut.getNode("endElement]").defaultTransition = [this](char ch) -> Automata::NodeType * {
buffer.push_back(ch);
event_state = no_event;
return &parserAut.getNode("element[");
};
parserAut.getNode("endElement]]").defaultTransition = parserAut.getNode("endElement]").defaultTransition;
// xml tag
rs.setTrans("tagStart",NameStartChar,"tagName",addTagName);
parserAut.getNode("tagName").defaultTransition = [this](char ch) -> Automata::NodeType * {
tagNameAdd(ch);
return &parserAut.getNode("tagName");
};
parserAut.setTrans("tagName",'/',"emptyTag");
parserAut.setTrans("tagName",'>',"start").output = geraStartTag;
rs.setTrans("tagName",S,"tagAttrSpace");
rs.setTrans("tagAttrSpace",S,"tagAttrSpace");
parserAut.setTrans("tagAttrSpace",'/',"emptyTag");
parserAut.setTrans("emptyTag",'>',"start").output = [this](char s){
event_state = empty_tag;
buffer.clear();
};
// TODO deixar o automato mais rigido nos atributos para gerar os malformed mais vezes
rs.setTrans("tagAttrSpace",NameStartChar,"tagAttrName",[this](char s){
event_state = start_attribute;
buffer.clear();
buffer.push_back(s);
});
parserAut.getNode("tagAttrName").defaultTransition = [this](char s) -> Automata::NodeType * {
buffer.push_back(s);
return &parserAut.getNode("tagAttrName");
};
auto attrNameFn = [this](char s){ event_state = attr_name; };
auto attrValueFn = [this](char s){ event_state = attr_value; };
rs.setTrans("tagAttrName",S,"tagAttrNameS");
rs.setTrans("tagAttrNameS",S,"tagAttrNameS");
parserAut.setTrans("tagAttrNameS",'=',"tagAttrValueStart").output = attrNameFn;
parserAut.setTrans("tagAttrName",'=',"tagAttrValueStart").output = attrNameFn;
rs.setTrans("tagAttrValueStart",S,"tagAttrValueStart");
parserAut.setTrans("tagAttrValueStart",'\'',"tagAttrValue1").output = limpaBuffer;
parserAut.setTrans("tagAttrValueStart",'"',"tagAttrValue2").output = limpaBuffer;
parserAut.setTrans("tagAttrValue1",'\'',"tagAttrSpace").output = attrValueFn;
parserAut.setTrans("tagAttrValue2",'"',"tagAttrSpace").output = attrValueFn;
parserAut.getNode("tagAttrValue1").defaultTransition = [this](char s) -> Automata::NodeType * {
buffer.push_back(s);
return &parserAut.getNode("tagAttrValue1");
};
parserAut.getNode("tagAttrValue2").defaultTransition = [this](char s) -> Automata::NodeType * {
buffer.push_back(s);
return &parserAut.getNode("tagAttrValue2");
};
// sem atributos. só espacos gays
parserAut.setTrans("tagAttrSpace",'>',"start").output = geraStartTag;
// nova tag, ignora buffer vazio
parserAut.setTrans("start",'<',"tagStart").output = limpaTag;
// qualquer outra coisa? gera evento de chars e o pullador vai usar o buffer
parserAut.getNode("start").defaultTransition = [this](char s) -> Automata::NodeType * {
buffer.push_back(s);
event_state = start_chars;
return &parserAut.getNode("TextNode");
};
parserAut.setTrans("TextNode",'<',"tagStart").output = [=](char s){
event_state = end_chars;
limpaTag(s);
};
parserAut.getNode("TextNode").defaultTransition = [this](char s) -> Automata::NodeType * {
return &parserAut.getNode("TextNode");
};
parserAut.setTrans("tagStart",'/',"tagEnd");
rs.setTrans("tagEnd",NameStartChar,"tagEndName",addTagName);
parserAut.getNode("tagEndName").defaultTransition = [this](char ch) -> Automata::NodeType * {
tagNameAdd(ch);
return &parserAut.getNode("tagEndName");
};
rs.setTrans("tagEndName",S,"tagEndSpace");
rs.setTrans("tagEndSpace",S,"tagEndSpace");
parserAut.setTrans("tagEndName",'>',"start").output = geraEndTag;
parserAut.setTrans("tagEndSpace",'>',"start").output = geraEndTag;
parserAut.setStart("start");
parserAut.getNode("start").final = true;
}
#define SR(var) var = fn; return *this;
Parser & Parser::startDocument(start_tag_event fn) { SR(startDocFn) }
Parser & Parser::startTag(start_tag_event fn) { SR(startElementFn) }
Parser & Parser::characters(char_event fn) { SR(charactersFn) }
Parser & Parser::endTag(end_tag_event fn) { SR(endElementFn) }
Parser & Parser::endDocument(end_tag_event fn) { SR(endDocFn) }
Parser & Parser::processingInstruction(processing_instruction_event fn) { SR(procInstrFn) }
Parser & Parser::element(processing_instruction_event fn) { SR(elementFn) }
void Parser::clear()
{
parser_state = prologue;
event_state = no_event;
buffer.clear();
TagStack().swap(tags); // only vs 2010 supports swap to rvalues on std::stack
consumer = parserAut.getConsumer();
}
bool Parser::parse(std::istream & is)
{
clear();
return parseContinue(is);
}
struct EventStateFixer {
EventState & event_state;
EventStateFixer(EventState & event_state): event_state(event_state) {}
~EventStateFixer() {
if( event_state == empty_tag ) {
event_state = end_tag;
} else {
event_state = no_event;
}
}
};
bool Parser::parseContinue(std::istream & is)
{
IteratorHelper ih(buffer,event_state,consumer,is);
try {
for(;;) {
int ch = is.get();
if( ch == std::char_traits<char>::eof() ) {
if( consumer.final() && parser_state == end_document ) return false;
throw PREMATURE_EOF;
}
if( ! consumer.consume(ch) ) throw MALFORMED;
while( event_state != no_event ) {
EventStateFixer evtFixer(event_state);
if( parser_state == end_document ) throw EXTRA;
switch(event_state) {
case empty_tag:
// o mesmo que start_tag, mas depois fará end_tag
case start_tag:
case start_attribute:
tags.push(tagName);
{ AttributeIterator attrIt(ih);
if( parser_state <= start_document ) {
parser_state = inside_document;
startDocFn(tagName,attrIt);
} else {
startElementFn(tagName,attrIt);
}
}
break;
case end_tag:
if( tags.empty() || tags.top() != tagName ) throw TAG_MISMATCH;
tags.pop();
if( tags.empty() ) {
parser_state = end_document;
endDocFn(tagName);
} else {
endElementFn(tagName);
}
break;
case start_chars:
{ CharIterator charIt(ih);
charactersFn(charIt);
}
break;
case special_element:
if( tagName == "CDATA" ) {
CharIterator charIt(ih);
charactersFn(charIt);
} else {
throw UNSUPPORTED; // TODO improve this to support conditionals
}
break;
case processing_instruction:
if( tagName == "xml" ) {
if( parser_state != prologue ) throw MALFORMED;
parser_state = doctype;
// TODO interpretar encoding e criar decoders
}
procInstrFn(tagName,buffer);
break;
case element_notation:
if( tagName == "DOCTYPE" ) {
if( parser_state != doctype ) throw MALFORMED;
parser_state = start_document;
// TODO interpretar DOCTYPE
}
elementFn(tagName,buffer);
break;
default: break;
}
}
}
} catch(xml::Exception ex) {
if( ex == ABORTED ) return true;
throw;
}
}
}
}