479 lines
10 KiB
Ragel
479 lines
10 KiB
Ragel
/*
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* This file is part of libgim.
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*
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* libgim is free software: you can redistribute it and/or modify it under the
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* terms of the GNU General Public License as published by the Free Software
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* Foundation, either version 3 of the License, or (at your option) any later
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* version.
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*
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* libgim is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with libgim. If not, see <http://www.gnu.org/licenses/>.
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*
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* Copyright 2010 Danny Robson <danny@blubinc.net>
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*/
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#include "json.hpp"
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#include "maths.hpp"
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#include "io.hpp"
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#include <cassert>
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#include <deque>
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#include <stdexcept>
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#include <cstdlib>
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#include <algorithm>
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#include <sstream>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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using namespace std;
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using namespace util;
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/*
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* Parsing
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*/
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struct parse_context {
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parse_context(json::node *_root):
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root (_root),
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value (NULL),
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key (NULL),
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start (NULL),
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stop (NULL)
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{ ; }
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json::node *root,
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*value,
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*key;
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const char *start,
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*stop;
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};
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%%{
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machine json;
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## Record whether parsing was successful for future use
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action success
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{ __success = true; }
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action failure {
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__success = false;
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/*std::cerr << std::endl
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<< "Failure on: '" << fc << "' in level " << top << " at " << fpc - p
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<< std::endl;
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*/
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}
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action new_object { nodestack.push_back (parse_context(new json::object)); }
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action new_array { nodestack.push_back (parse_context(new json::array)); }
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action new_object_value {
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assert (nodestack.back ().root->is_object ());
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assert (nodestack.back ().key);
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assert (nodestack.back ().value);
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if (!nodestack.back ().key->is_string ())
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throw error ("object keys must be strings");
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json::object *object = (json::object *)nodestack.back ().root;
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object->insert (nodestack.back ().key->to_string (),
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nodestack.back ().value);
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nodestack.back ().key = NULL;
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nodestack.back ().value = NULL;
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}
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action new_array_value {
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assert (nodestack.back ().root->is_array ());
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assert (nodestack.back ().value);
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json::array *array = (json::array *)nodestack.back ().root;
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array->insert (nodestack.back ().value);
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nodestack.back ().value = NULL;
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}
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action new_string {
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assert (!nodestack.empty ());
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assert (!nodestack.back ().value);
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std::string value (std::string (nodestack.back ().start,
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nodestack.back ().stop));
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nodestack.back ().value = new json::string(value);
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}
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action new_boolean {
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assert (!nodestack.empty ());
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assert (!nodestack.back ().value);
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throw error ("unable to parse boolean");
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}
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action new_number {
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assert (!nodestack.empty ());
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assert (!nodestack.back ().value);
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errno = 0;
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double value = strtod (nodestack.back ().start, NULL);
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if (errno)
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throw error ("unable to parse number");
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nodestack.back ().value = new json::number (value);
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}
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action new_null {
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assert (!nodestack.empty ());
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assert (!nodestack.back ().value);
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nodestack.back().value = new json::null ();
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}
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action new_object_key {
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assert (!nodestack.empty ());
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assert (nodestack.back ().root->is_object ());
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assert (nodestack.back ().value);
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assert (!nodestack.back ().key);
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nodestack.back ().key = nodestack.back ().value;
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nodestack.back ().value = NULL;
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}
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prepush {
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fsmstack.push_back (0);
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}
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postpop {
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fsmstack.pop_back ();
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__root = nodestack.back ().root;
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if (nodestack.size () > 1)
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(nodestack.rbegin () + 1)->value = nodestack.back ().root;
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nodestack.pop_back ();
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}
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variable stack fsmstack;
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alphtype char;
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## numerical
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exp = [eE]('-' | '+')? digit+;
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frac = '.' digit+;
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int = '-'? [1-9]? digit+;
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number = int ( frac
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| exp
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| frac exp)?;
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## textual
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char =
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any - (cntrl | '\"' | '\\')
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| '\\\"'
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| '\\\\'
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| '\\/'
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| '\\b'
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| '\\f'
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| '\\n'
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| '\\r'
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| '\\t'
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| '\\u' xdigit{4};
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string = ('"'
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char* >{ nodestack.back ().start = fpc; }
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%{ nodestack.back ().stop = fpc; })
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'"'
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@new_string;
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## other
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boolean =
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'true' @{ nodestack.back ().value = new json::boolean ( true); }
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| 'false' @{ nodestack.back ().value = new json::boolean (false); };
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## components
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object = '{' @{ fhold; fcall _object; } '}';
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array = '[' @{ fhold; fcall _array; } ']';
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value =
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string
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| boolean
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| number >{ nodestack.back ().start = fpc; } %{ nodestack.back ().stop = fpc; } %new_number
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| object
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| array
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| 'null' %new_null;
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## compound data types
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_array := ('[' @new_array
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space* ((value %new_array_value space* ',' space*)* value %new_array_value space*)?
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']')
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$!failure
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@{ fhold; fret; };
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pair = string %new_object_key space* ':' space* value %new_object_value;
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_object := ('{' @new_object
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space* ((pair space* ',' space*)* pair space*)?
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'}')
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$!failure
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@{ fhold; fret; };
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json := (space* object space*)
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$!failure
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%success
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>{ __success = false; };
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write data;
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}%%
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/*
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* Node
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*/
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namespace json {
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json::node *
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parse (const boost::filesystem::path &path)
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{ return parse ((const char *)slurp (path)); }
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json::node *
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parse (const std::string &path)
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{ return parse (path.c_str (), path.c_str () + path.size ()); }
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node *
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parse (const char *start,
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const char *stop) {
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bool __success = true;
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json::node *__root = NULL;
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size_t cs, top = 0;
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deque <size_t> fsmstack;
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deque <parse_context> nodestack;
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const char *p = start,
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*pe = stop,
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*eof = stop;
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%%write init;
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%%write exec;
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if (!__success)
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throw error ("unable to parse json");
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//__root->print (cout) << endl;
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assert (*__root == *__root);
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return __root;
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}
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node*
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parse (const char *start)
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{ return parse (start, start + strlen (start)); }
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}
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const json::object&
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json::node::to_object (void) const
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{ throw error ("node is not an object"); }
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const json::array&
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json::node::to_array (void) const
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{ throw error ("node is not an array"); }
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const json::string&
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json::node::to_string (void) const
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{ throw error ("node is not a string"); }
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const json::number&
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json::node::to_number (void) const
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{ throw error ("node is not a number"); }
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const json::boolean&
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json::node::to_boolean (void) const
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{ throw error ("node is not a boolean"); }
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bool
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json::node::operator!=(const node &rhs) const
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{ return !(*this == rhs); }
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const json::node&
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json::node::operator[] (const std::string &key) const
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{ return to_object ()[key]; }
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const json::node&
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json::node::operator[] (unsigned int idx) const
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{ return to_array()[idx]; }
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/*
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* Object
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*/
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json::object::~object () {
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for (auto i = m_values.begin (); i != m_values.end (); ++i)
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delete i->second;
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}
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bool
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json::object::operator ==(const json::object &rhs) const {
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for (auto i = rhs.m_values.begin (), j = m_values.begin ();
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i != rhs.m_values.end () && j != m_values.end ();
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++i, ++j)
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{
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if (i->first != j->first)
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return false;
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if ((*i->second) != (*j->second))
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return false;
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}
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return true;
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}
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void
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json::object::insert (const std::string &_key, json::node* value)
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{ m_values[_key] = value; }
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const json::node&
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json::object::operator[](const std::string &key) const {
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auto value = m_values.find (key);
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if (value == m_values.end ()) {
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ostringstream ss;
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ss << "no key: " << key;
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throw json::error (ss.str());
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}
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return *value->second;
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}
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std::ostream&
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json::object::print (std::ostream &os) const {
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os << "{";
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for (auto i = m_values.begin (); i != m_values.end ();) {
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os << '"' << i->first << "\" : " << *i->second;
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if (++i != m_values.end ())
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os << ",\n";
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}
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os << "}";
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return os;
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}
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/*
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* Array
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*/
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json::array::~array() {
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for (auto i = m_values.begin(); i != m_values.end (); ++i)
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delete *i;
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}
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void
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json::array::insert (json::node *_value)
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{ m_values.push_back (_value); }
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bool
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json::array::operator ==(const json::array &rhs) const {
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for (auto i = rhs.m_values.begin (), j = m_values.begin ();
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i != rhs.m_values.end () && j != m_values.end ();
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++i, ++j)
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{ if ((**i) != (**j)) return false; }
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return true;
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}
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std::ostream&
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json::array::print (std::ostream &os) const {
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os << "[ ";
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for (auto i = m_values.begin (); i != m_values.end (); ++i) {
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os << (*i)->print (os);
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if (i != m_values.end () - 1)
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os << ", ";
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}
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os << "]";
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return os;
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}
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/*
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* String
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*/
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std::ostream&
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json::string::print (std::ostream &os) const {
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os << '"' << m_value << '"';
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return os;
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}
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bool
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json::string::operator ==(const json::string &rhs) const
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{ return rhs.m_value == m_value; }
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/*
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* Number
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*/
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std::ostream&
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json::number::print (std::ostream &os) const {
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os << '"' << m_value << '"';
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return os;
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}
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bool
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json::number::operator ==(const json::number &rhs) const
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{ return almost_equal (rhs.m_value, m_value); }
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/*
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* Boolean
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*/
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std::ostream&
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json::boolean::print (std::ostream &os) const {
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os << '"' << (m_value ? "true" : "false") << '"';
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return os;
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}
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bool
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json::boolean::operator ==(const json::boolean &rhs) const
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{ return rhs.m_value == m_value; }
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/*
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* Null
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*/
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std::ostream&
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json::null::print (std::ostream &os) const {
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os << "null";
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return os;
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}
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ostream&
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operator <<(ostream &os, const json::node &n)
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{ return n.print (os); }
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