-USING: arrays json.reader kernel multiline strings tools.test ;
+USING: arrays json.reader kernel multiline strings tools.test hashtables ;
IN: json.reader.tests
{ f } [ "false" json> ] unit-test
{ 102 } [ "102" json> ] unit-test
{ -102 } [ "-102" json> ] unit-test
{ 102 } [ "+102" json> ] unit-test
+{ 1000.0 } [ "1.0e3" json> ] unit-test
+{ 1000.0 } [ "10e2" json> ] unit-test
{ 102.0 } [ "102.0" json> ] unit-test
{ 102.5 } [ "102.5" json> ] unit-test
{ 102.5 } [ "102.50" json> ] unit-test
{ -10250.0 } [ "-102.5e2" json> ] unit-test
{ -10250.0 } [ "-102.5E+2" json> ] unit-test
-{ 10+1/4 } [ "1025e-2" json> ] unit-test
+{ 10.25 } [ "1025e-2" json> ] unit-test
{ 0.125 } [ "0.125" json> ] unit-test
{ -0.125 } [ "-0.125" json> ] unit-test
+! not widely supported by javascript, but allowed in the grammar, and a nice
+! feature to get
+{ -0.0 } [ "-0.0" json> ] unit-test
+
{ " fuzzy pickles " } [ <" " fuzzy pickles " "> json> ] unit-test
{ "while 1:\n\tpass" } [ <" "while 1:\n\tpass" "> json> ] unit-test
+! unicode is allowed in json
+{ "ß∂¬ƒ˚∆" } [ <" "ß∂¬ƒ˚∆""> json> ] unit-test
{ 8 9 10 12 13 34 47 92 } >string 1array [ <" "\b\t\n\f\r\"\/\\" "> json> ] unit-test
{ HEX: abcd } >string 1array [ <" "\uaBCd" "> json> ] unit-test
+{ { } } [ "[]" json> ] unit-test
{ { 1 "two" 3.0 } } [ <" [1, "two", 3.0] "> json> ] unit-test
+{ H{ } } [ "{}" json> ] unit-test
+
+! the returned hashtable should be different every time
+{ H{ } } [ "key" "value" "{}" json> ?set-at "{}" json> nip ] unit-test
+
{ H{ { "US$" 1.0 } { "EU€" 1.5 } } } [ <" { "US$":1.00, "EU\u20AC":1.50 } "> json> ] unit-test
{ H{
{ "fib" { 1 1 2 3 5 8 H{ { "etc" "etc" } } } }
{ 0 } [ " 0" json> ] unit-test
{ 0 } [ "0 " json> ] unit-test
{ 0 } [ " 0 " json> ] unit-test
-
-! Copyright (C) 2006 Chris Double.
+! Copyright (C) 2008 Peter Burns.
! See http://factorcode.org/license.txt for BSD license.
-USING: kernel parser-combinators namespaces make sequences promises strings
- assocs math math.parser math.vectors math.functions math.order
- lists hashtables ascii accessors ;
+USING: kernel peg peg.ebnf math.parser math.private strings math math.functions sequences
+ arrays vectors hashtables assocs prettyprint ;
IN: json.reader
-! Grammar for JSON from RFC 4627
-
-SYMBOL: json-null
-
-: [<&>] ( quot -- quot )
- { } make unclip [ <&> ] reduce ;
-
-: [<|>] ( quot -- quot )
- { } make unclip [ <|> ] reduce ;
-
-LAZY: 'ws' ( -- parser )
- " " token
- "\n" token <|>
- "\r" token <|>
- "\t" token <|> <*> ;
-
-LAZY: spaced ( parser -- parser )
- 'ws' swap &> 'ws' <& ;
-
-LAZY: 'begin-array' ( -- parser )
- "[" token spaced ;
-
-LAZY: 'begin-object' ( -- parser )
- "{" token spaced ;
-
-LAZY: 'end-array' ( -- parser )
- "]" token spaced ;
-
-LAZY: 'end-object' ( -- parser )
- "}" token spaced ;
-
-LAZY: 'name-separator' ( -- parser )
- ":" token spaced ;
-
-LAZY: 'value-separator' ( -- parser )
- "," token spaced ;
-
-LAZY: 'false' ( -- parser )
- "false" token [ drop f ] <@ ;
-
-LAZY: 'null' ( -- parser )
- "null" token [ drop json-null ] <@ ;
-
-LAZY: 'true' ( -- parser )
- "true" token [ drop t ] <@ ;
-
-LAZY: 'quot' ( -- parser )
- "\"" token ;
-
-LAZY: 'hex-digit' ( -- parser )
- [ digit> ] satisfy [ digit> ] <@ ;
-
-: hex-digits>ch ( digits -- ch )
- 0 [ swap 16 * + ] reduce ;
-
-LAZY: 'string-char' ( -- parser )
- [ quotable? ] satisfy
- "\\b" token [ drop 8 ] <@ <|>
- "\\t" token [ drop CHAR: \t ] <@ <|>
- "\\n" token [ drop CHAR: \n ] <@ <|>
- "\\f" token [ drop 12 ] <@ <|>
- "\\r" token [ drop CHAR: \r ] <@ <|>
- "\\\"" token [ drop CHAR: " ] <@ <|>
- "\\/" token [ drop CHAR: / ] <@ <|>
- "\\\\" token [ drop CHAR: \\ ] <@ <|>
- "\\u" token 'hex-digit' 4 exactly-n &>
- [ hex-digits>ch ] <@ <|> ;
-
-LAZY: 'string' ( -- parser )
- 'quot'
- 'string-char' <*> &>
- 'quot' <& [ >string ] <@ ;
+SINGLETON: json-null
-DEFER: 'value'
-LAZY: 'member' ( -- parser )
- 'string'
- 'name-separator' <&
- 'value' <&> ;
+: grammar-list>vector ( seq -- vec ) first2 values swap prefix ;
-USE: prettyprint
-LAZY: 'object' ( -- parser )
- 'begin-object'
- 'member' 'value-separator' list-of &>
- 'end-object' <& [ >hashtable ] <@ ;
-
-LAZY: 'array' ( -- parser )
- 'begin-array'
- 'value' 'value-separator' list-of &>
- 'end-array' <& ;
-
-LAZY: 'minus' ( -- parser )
- "-" token ;
-
-LAZY: 'plus' ( -- parser )
- "+" token ;
-
-LAZY: 'sign' ( -- parser )
- 'minus' 'plus' <|> ;
-
-LAZY: 'zero' ( -- parser )
- "0" token [ drop 0 ] <@ ;
-
-LAZY: 'decimal-point' ( -- parser )
- "." token ;
-
-LAZY: 'digit1-9' ( -- parser )
- [
- dup integer? [
- CHAR: 1 CHAR: 9 between?
- ] [
- drop f
- ] if
- ] satisfy [ digit> ] <@ ;
-
-LAZY: 'digit0-9' ( -- parser )
- [ digit? ] satisfy [ digit> ] <@ ;
-
-: decimal>integer ( seq -- num ) 10 digits>integer ;
-
-LAZY: 'int' ( -- parser )
- 'zero'
- 'digit1-9' 'digit0-9' <*> <&:> [ decimal>integer ] <@ <|> ;
-
-LAZY: 'e' ( -- parser )
- "e" token "E" token <|> ;
-
-: sign-number ( pair -- number )
- #! Pair is { minus? num }
- #! Convert the json number value to a factor number
- dup second swap first [ first "-" = [ -1 * ] when ] when* ;
-
-LAZY: 'exp' ( -- parser )
- 'e'
- 'sign' <?> &>
- 'digit0-9' <+> [ decimal>integer ] <@ <&> [ sign-number ] <@ ;
-
-: sequence>frac ( seq -- num )
- #! { 1 2 3 } => 0.123
- reverse 0 [ swap 10 / + ] reduce 10 / >float ;
-
-LAZY: 'frac' ( -- parser )
- 'decimal-point' 'digit0-9' <+> &> [ sequence>frac ] <@ ;
-
-: raise-to-power ( pair -- num )
- #! Pair is { num exp }.
- #! Multiply 'num' by 10^exp
- dup second dup [ 10 swap first ^ swap first * ] [ drop first ] if ;
-
-LAZY: 'number' ( -- parser )
- 'sign' <?>
- [ 'int' , 'frac' 0 succeed <|> , ] [<&>] [ sum ] <@
- 'exp' <?> <&> [ raise-to-power ] <@ <&> [ sign-number ] <@ ;
-
-LAZY: 'value' ( -- parser )
- [
- 'false' ,
- 'null' ,
- 'true' ,
- 'string' ,
- 'object' ,
- 'array' ,
- 'number' ,
- ] [<|>] spaced ;
-ERROR: could-not-parse-json ;
-
-: json> ( string -- object )
- #! Parse a json formatted string to a factor object
- 'value' parse dup nil? [
- could-not-parse-json
- ] [
- car parsed>>
- ] if ;
+! Grammar for JSON from RFC 4627
+EBNF: json>
+
+ws = (" " | "\r" | "\t" | "\n")*
+
+true = "true" => [[ t ]]
+false = "false" => [[ f ]]
+null = "null" => [[ json-null ]]
+
+hex = [0-9a-fA-F]
+char = '\\"' [[ CHAR: " ]]
+ | "\\\\" [[ CHAR: \ ]]
+ | "\\/" [[ CHAR: / ]]
+ | "\\b" [[ 8 ]]
+ | "\\f" [[ 12 ]]
+ | "\\n" [[ CHAR: \n ]]
+ | "\\r" [[ CHAR: \r ]]
+ | "\\t" [[ CHAR: \t ]]
+ | "\\u" (hex hex hex hex) [[ hex> ]] => [[ second ]]
+ | [^"\]
+string = '"' char*:cs '"' => [[ cs >string ]]
+
+sign = ("-" | "+")? => [[ "-" = "-" "" ? ]]
+digits = [0-9]+ => [[ >string ]]
+decimal = "." digits => [[ concat ]]
+exp = ("e" | "E") sign digits => [[ concat ]]
+number = sign digits decimal? exp? => [[ dup concat swap fourth [ string>float ] [ string>number ] if ]]
+
+elements = value ("," value)* => [[ grammar-list>vector ]]
+array = "[" elements?:arr "]" => [[ arr >array ]]
+
+pair = ws string:key ws ":" value:val => [[ { key val } ]]
+members = pair ("," pair)* => [[ grammar-list>vector ]]
+object = "{" members?:hash "}" => [[ hash >hashtable ]]
+
+val = true
+ | false
+ | null
+ | string
+ | number
+ | array
+ | object
+
+value = ws val:v ws => [[ v ]]
+
+;EBNF
\ No newline at end of file
! See http://factorcode.org/license.txt for BSD license.
USING: kernel io.streams.string io strings splitting sequences
math math.parser assocs classes words namespaces make
-prettyprint hashtables mirrors tr ;
+prettyprint hashtables mirrors tr json.reader ;
IN: json.writer
#! Writes the object out to a stream in JSON format
GENERIC: json-print ( obj -- )
: >json ( obj -- string )
- #! Returns a string representing the factor object in JSON format
- [ json-print ] with-string-writer ;
+ #! Returns a string representing the factor object in JSON format
+ [ json-print ] with-string-writer ;
M: f json-print ( f -- )
- drop "false" write ;
+ drop "false" write ;
+
+M: t json-print ( t -- )
+ drop "true" write ;
+
+M: json-null json-print ( null -- )
+ drop "null" write ;
M: string json-print ( obj -- )
- CHAR: " write1 "\"" split "\\\"" join CHAR: \r swap remove "\n" split "\\r\\n" join write CHAR: " write1 ;
+ CHAR: " write1 "\"" split "\\\"" join CHAR: \r swap remove "\n" split "\\r\\n" join write CHAR: " write1 ;
M: number json-print ( num -- )
- number>string write ;
+ number>string write ;
M: sequence json-print ( array -- )
- CHAR: [ write1 [ >json ] map "," join write CHAR: ] write1 ;
+ CHAR: [ write1 [ >json ] map "," join write CHAR: ] write1 ;
TR: jsvar-encode "-" "_" ;
: tuple>fields ( object -- seq )
- <mirror> [
- [ swap jsvar-encode >json % " : " % >json % ] "" make
- ] { } assoc>map ;
+ <mirror> [
+ [ swap jsvar-encode >json % " : " % >json % ] "" make
+ ] { } assoc>map ;
M: tuple json-print ( tuple -- )
- CHAR: { write1 tuple>fields "," join write CHAR: } write1 ;
+ CHAR: { write1 tuple>fields "," join write CHAR: } write1 ;
M: hashtable json-print ( hashtable -- )
- CHAR: { write1
- [ [ swap jsvar-encode >json % CHAR: : , >json % ] "" make ]
- { } assoc>map "," join write
- CHAR: } write1 ;
+ CHAR: { write1
+ [ [ swap jsvar-encode >json % CHAR: : , >json % ] "" make ]
+ { } assoc>map "," join write
+ CHAR: } write1 ;
M: object json-print ( object -- )
unparse json-print ;
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