类 JSON::Ext::Parser
这是作为 C 扩展实现的 JSON 解析器。可以通过设置
JSON.parser = JSON::Ext::Parser
使用 JSON 中的 parser= 方法。
公共类方法
new(source, opts → {}) 点击切换源代码
为字符串 source 创建一个新的 JSON::Ext::Parser 实例。
它将由 opts 哈希配置。opts 可以包含以下键
opts 可以包含以下键
-
max_nesting: 解析的数据结构中允许的最大嵌套深度。使用 :max_nesting => false|nil|0 禁用深度检查，默认值为 100。
-
allow_nan: 如果设置为 true，则允许 NaN、Infinity 和 -Infinity 违反 RFC 4627 被
Parser解析。此选项默认为 false。 -
symbolize_names: 如果设置为 true，则返回
JSON对象中名称（键）的符号。否则返回字符串，这也是默认值。无法将此选项与 create_additions 选项一起使用。 -
create_additions: 如果设置为 false，则即使找到匹配的类和 create_id，
Parser也不会创建附加项。此选项默认为 false。 -
object_class: 默认值为
Hash -
array_class: 默认值为
Array
static VALUE cParser_initialize(int argc, VALUE *argv, VALUE self)
{
VALUE source, opts;
GET_PARSER_INIT;
if (json->Vsource) {
rb_raise(rb_eTypeError, "already initialized instance");
}
rb_scan_args(argc, argv, "1:", &source, &opts);
if (!NIL_P(opts)) {
VALUE tmp = ID2SYM(i_max_nesting);
if (option_given_p(opts, tmp)) {
VALUE max_nesting = rb_hash_aref(opts, tmp);
if (RTEST(max_nesting)) {
Check_Type(max_nesting, T_FIXNUM);
json->max_nesting = FIX2INT(max_nesting);
} else {
json->max_nesting = 0;
}
} else {
json->max_nesting = 100;
}
tmp = ID2SYM(i_allow_nan);
if (option_given_p(opts, tmp)) {
json->allow_nan = RTEST(rb_hash_aref(opts, tmp)) ? 1 : 0;
} else {
json->allow_nan = 0;
}
tmp = ID2SYM(i_symbolize_names);
if (option_given_p(opts, tmp)) {
json->symbolize_names = RTEST(rb_hash_aref(opts, tmp)) ? 1 : 0;
} else {
json->symbolize_names = 0;
}
tmp = ID2SYM(i_freeze);
if (option_given_p(opts, tmp)) {
json->freeze = RTEST(rb_hash_aref(opts, tmp)) ? 1 : 0;
} else {
json->freeze = 0;
}
tmp = ID2SYM(i_create_additions);
if (option_given_p(opts, tmp)) {
json->create_additions = RTEST(rb_hash_aref(opts, tmp));
} else {
json->create_additions = 0;
}
if (json->symbolize_names && json->create_additions) {
rb_raise(rb_eArgError,
"options :symbolize_names and :create_additions cannot be "
" used in conjunction");
}
tmp = ID2SYM(i_create_id);
if (option_given_p(opts, tmp)) {
json->create_id = rb_hash_aref(opts, tmp);
} else {
json->create_id = rb_funcall(mJSON, i_create_id, 0);
}
tmp = ID2SYM(i_object_class);
if (option_given_p(opts, tmp)) {
json->object_class = rb_hash_aref(opts, tmp);
} else {
json->object_class = Qnil;
}
tmp = ID2SYM(i_array_class);
if (option_given_p(opts, tmp)) {
json->array_class = rb_hash_aref(opts, tmp);
} else {
json->array_class = Qnil;
}
tmp = ID2SYM(i_decimal_class);
if (option_given_p(opts, tmp)) {
json->decimal_class = rb_hash_aref(opts, tmp);
} else {
json->decimal_class = Qnil;
}
tmp = ID2SYM(i_match_string);
if (option_given_p(opts, tmp)) {
VALUE match_string = rb_hash_aref(opts, tmp);
json->match_string = RTEST(match_string) ? match_string : Qnil;
} else {
json->match_string = Qnil;
}
} else {
json->max_nesting = 100;
json->allow_nan = 0;
json->create_additions = 0;
json->create_id = Qnil;
json->object_class = Qnil;
json->array_class = Qnil;
json->decimal_class = Qnil;
}
source = convert_encoding(StringValue(source));
StringValue(source);
json->len = RSTRING_LEN(source);
json->source = RSTRING_PTR(source);;
json->Vsource = source;
return self;
}
公共实例方法
parse() 点击切换源代码
解析当前 JSON 文本 source 并返回完整的数据结构作为结果。如果解析失败，则会引发 JSON::ParserError。
static VALUE cParser_parse(VALUE self)
{
char *p, *pe;
int cs = EVIL;
VALUE result = Qnil;
GET_PARSER;
#line 1946 "parser.c"
{
cs = JSON_start;
}
#line 845 "parser.rl"
p = json->source;
pe = p + json->len;
#line 1955 "parser.c"
{
if ( p == pe )
goto _test_eof;
switch ( cs )
{
st1:
if ( ++p == pe )
goto _test_eof1;
case 1:
switch( (*p) ) {
case 13: goto st1;
case 32: goto st1;
case 34: goto tr2;
case 45: goto tr2;
case 47: goto st6;
case 73: goto tr2;
case 78: goto tr2;
case 91: goto tr2;
case 102: goto tr2;
case 110: goto tr2;
case 116: goto tr2;
case 123: goto tr2;
}
if ( (*p) > 10 ) {
if ( 48 <= (*p) && (*p) <= 57 )
goto tr2;
} else if ( (*p) >= 9 )
goto st1;
goto st0;
st0:
cs = 0;
goto _out;
tr2:
#line 820 "parser.rl"
{
char *np = JSON_parse_value(json, p, pe, &result, 0);
if (np == NULL) { p--; {p++; cs = 10; goto _out;} } else {p = (( np))-1;}
}
goto st10;
st10:
if ( ++p == pe )
goto _test_eof10;
case 10:
#line 1999 "parser.c"
switch( (*p) ) {
case 13: goto st10;
case 32: goto st10;
case 47: goto st2;
}
if ( 9 <= (*p) && (*p) <= 10 )
goto st10;
goto st0;
st2:
if ( ++p == pe )
goto _test_eof2;
case 2:
switch( (*p) ) {
case 42: goto st3;
case 47: goto st5;
}
goto st0;
st3:
if ( ++p == pe )
goto _test_eof3;
case 3:
if ( (*p) == 42 )
goto st4;
goto st3;
st4:
if ( ++p == pe )
goto _test_eof4;
case 4:
switch( (*p) ) {
case 42: goto st4;
case 47: goto st10;
}
goto st3;
st5:
if ( ++p == pe )
goto _test_eof5;
case 5:
if ( (*p) == 10 )
goto st10;
goto st5;
st6:
if ( ++p == pe )
goto _test_eof6;
case 6:
switch( (*p) ) {
case 42: goto st7;
case 47: goto st9;
}
goto st0;
st7:
if ( ++p == pe )
goto _test_eof7;
case 7:
if ( (*p) == 42 )
goto st8;
goto st7;
st8:
if ( ++p == pe )
goto _test_eof8;
case 8:
switch( (*p) ) {
case 42: goto st8;
case 47: goto st1;
}
goto st7;
st9:
if ( ++p == pe )
goto _test_eof9;
case 9:
if ( (*p) == 10 )
goto st1;
goto st9;
}
_test_eof1: cs = 1; goto _test_eof;
_test_eof10: cs = 10; goto _test_eof;
_test_eof2: cs = 2; goto _test_eof;
_test_eof3: cs = 3; goto _test_eof;
_test_eof4: cs = 4; goto _test_eof;
_test_eof5: cs = 5; goto _test_eof;
_test_eof6: cs = 6; goto _test_eof;
_test_eof7: cs = 7; goto _test_eof;
_test_eof8: cs = 8; goto _test_eof;
_test_eof9: cs = 9; goto _test_eof;
_test_eof: {}
_out: {}
}
#line 848 "parser.rl"
if (cs >= JSON_first_final && p == pe) {
return result;
} else {
rb_enc_raise(EXC_ENCODING eParserError, "unexpected token at '%s'", p);
return Qnil;
}
}
source() 点击切换源代码
返回用于构建此 Parser 的当前 source 字符串的副本。
static VALUE cParser_source(VALUE self)
{
GET_PARSER;
return rb_str_dup(json->Vsource);
}