parser.h

Oracle调用接口

#ifndef __PARSER_H_
#define __PARSER_H_

#include <stdio.h>
#include <stdlib.h>
#include <string>
#include <map>

//Project includes 
#include "TemplateContainer.h"
#include "TemplateObject.h"
#include "TemplateError.h"

typedef enum {ID,STRING,EQ,LT,GT,VZ,SLASH,SPACE,ESCAPE,OTHER} token_type;

struct token {
	string image;
	token_type type;
	int line,pos; // line and position of token's first symbol 
};



struct TmplTag {
	int begin_line,begin_pos;
	string name;
	map<string,string> args;
};

typedef void (*tag_handler)(TemplateContainer *t,TemplateObject *,TmplTag &tag,bool,FILE *);

class Parser {
public:
	Parser();
	Parser(TemplateContainer *t,TemplateObject *curr,string end_tag,FILE *out_stream=stdout);
	void addHandler(string tag,tag_handler handler);
	void setTemplate(TemplateContainer *t);
	void setCurrent(TemplateObject *curr);
	void setEndTag(string &end_tag);
	void setOutStream(FILE *out_stream);
	void setActive(bool active) { is_active=active; }
	void parse();


private:
	TemplateContainer *tmpl;
	TemplateObject *current;
	string end_tag;
	FILE *out;
	map<string,tag_handler> tag_handlers; // map of pointers to functions to be called when tag occured
	bool is_active;
	
private:
	token getToken(); 
	inline char nextpos();
	inline void print(token t);	
	inline void step_back();
};


inline char Parser::nextpos() {
	return tmpl->next();
}
inline void Parser::print(token t) {
	if(is_active) {
		if(t.type==STRING) {
			fputs("\"",out);
			fputs(t.image.c_str(),out);
			fputs("\"",out);
		} else fputs(t.image.c_str(),out);
	}
}

inline void Parser::step_back() {
	tmpl->prev();	
}

// Error handling ...

class ParserError: public TemplateError {
public:
	ParserError():TemplateError() { }
	ParserError(string error,token t):TemplateError(error) {
		char buf[256];
		snprintf(buf,256,"At %d:%d> ",t.line,t.pos);
		error_msg=string(buf)+error;
	}
	
	ParserError(string error,TmplTag t) : TemplateError(error) {
		char buf[256];
		map<string,string>::const_iterator ci=t.args.begin();
		snprintf(buf,255,"%d:%d",t.begin_line,t.begin_pos);
		error_msg=string("At ")+buf+"> "+error+"\n";
		error_msg+="Here's a list of arguments of "+t.name+":\n";
		while(ci!=t.args.end()) {
			error_msg+=ci->first+"="+ci->second+"\n";
			ci++;
		}
	}
};		

#endif