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;; This document describes TOML's syntax, using the ABNF format (defined in |
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;; RFC 5234 -- https://www.ietf.org/rfc/rfc5234.txt). |
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;; |
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;; All valid TOML documents will match this description, however certain |
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;; invalid documents would need to be rejected as per the semantics described |
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;; in the supporting text description. |
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;; It is possible to try this grammar interactively, using instaparse. |
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;; http://instaparse.mojombo.com/ |
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;; |
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;; To do so, in the lower right, click on Options and change `:input-format` to |
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;; ':abnf'. Then paste this entire ABNF document into the grammar entry box |
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;; (above the options). Then you can type or paste a sample TOML document into |
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;; the beige box on the left. Tada! |
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;; Overall Structure |
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toml = expression *( newline expression ) |
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expression = ws [ comment ] |
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expression =/ ws keyval ws [ comment ] |
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expression =/ ws table ws [ comment ] |
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;; Whitespace |
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ws = *wschar |
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wschar = %x20 ; Space |
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wschar =/ %x09 ; Horizontal tab |
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;; Newline |
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newline = %x0A ; LF |
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newline =/ %x0D.0A ; CRLF |
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;; Comment |
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comment-start-symbol = %x23 ; # |
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non-ascii = %x80-D7FF / %xE000-10FFFF |
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non-eol = %x09 / %x20-7F / non-ascii |
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comment = comment-start-symbol *non-eol |
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;; Key-Value pairs |
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keyval = key keyval-sep val |
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key = simple-key / dotted-key |
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simple-key = quoted-key / unquoted-key |
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unquoted-key = 1*( ALPHA / DIGIT / %x2D / %x5F ) ; A-Z / a-z / 0-9 / - / _ |
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quoted-key = basic-string / literal-string |
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dotted-key = simple-key 1*( dot-sep simple-key ) |
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dot-sep = ws %x2E ws ; . Period |
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keyval-sep = ws %x3D ws ; = |
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val = string / boolean / array / inline-table / date-time / float / integer |
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;; String |
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string = ml-basic-string / basic-string / ml-literal-string / literal-string |
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;; Basic String |
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basic-string = quotation-mark *basic-char quotation-mark |
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quotation-mark = %x22 ; " |
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basic-char = basic-unescaped / escaped |
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basic-unescaped = wschar / %x21 / %x23-5B / %x5D-7E / non-ascii |
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escaped = escape escape-seq-char |
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escape = %x5C ; \ |
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escape-seq-char = %x22 ; " quotation mark U+0022 |
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escape-seq-char =/ %x5C ; \ reverse solidus U+005C |
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escape-seq-char =/ %x62 ; b backspace U+0008 |
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escape-seq-char =/ %x66 ; f form feed U+000C |
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escape-seq-char =/ %x6E ; n line feed U+000A |
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escape-seq-char =/ %x72 ; r carriage return U+000D |
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escape-seq-char =/ %x74 ; t tab U+0009 |
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escape-seq-char =/ %x75 4HEXDIG ; uXXXX U+XXXX |
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escape-seq-char =/ %x55 8HEXDIG ; UXXXXXXXX U+XXXXXXXX |
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;; Multiline Basic String |
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ml-basic-string = ml-basic-string-delim [ newline ] ml-basic-body |
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ml-basic-string-delim |
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ml-basic-string-delim = 3quotation-mark |
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ml-basic-body = *mlb-content *( mlb-quotes 1*mlb-content ) [ mlb-quotes ] |
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mlb-content = mlb-char / newline / mlb-escaped-nl |
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mlb-char = mlb-unescaped / escaped |
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mlb-quotes = 1*2quotation-mark |
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mlb-unescaped = wschar / %x21 / %x23-5B / %x5D-7E / non-ascii |
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mlb-escaped-nl = escape ws newline *( wschar / newline ) |
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;; Literal String |
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literal-string = apostrophe *literal-char apostrophe |
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apostrophe = %x27 ; ' apostrophe |
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literal-char = %x09 / %x20-26 / %x28-7E / non-ascii |
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;; Multiline Literal String |
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ml-literal-string = ml-literal-string-delim [ newline ] ml-literal-body |
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ml-literal-string-delim |
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ml-literal-string-delim = 3apostrophe |
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ml-literal-body = *mll-content *( mll-quotes 1*mll-content ) [ mll-quotes ] |
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mll-content = mll-char / newline |
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mll-char = %x09 / %x20-26 / %x28-7E / non-ascii |
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mll-quotes = 1*2apostrophe |
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;; Integer |
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integer = dec-int / hex-int / oct-int / bin-int |
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minus = %x2D ; - |
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plus = %x2B ; + |
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underscore = %x5F ; _ |
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digit1-9 = %x31-39 ; 1-9 |
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digit0-7 = %x30-37 ; 0-7 |
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digit0-1 = %x30-31 ; 0-1 |
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hex-prefix = %x30.78 ; 0x |
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oct-prefix = %x30.6F ; 0o |
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bin-prefix = %x30.62 ; 0b |
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dec-int = [ minus / plus ] unsigned-dec-int |
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unsigned-dec-int = DIGIT / digit1-9 1*( DIGIT / underscore DIGIT ) |
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hex-int = hex-prefix HEXDIG *( HEXDIG / underscore HEXDIG ) |
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oct-int = oct-prefix digit0-7 *( digit0-7 / underscore digit0-7 ) |
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bin-int = bin-prefix digit0-1 *( digit0-1 / underscore digit0-1 ) |
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;; Float |
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float = float-int-part ( exp / frac [ exp ] ) |
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float =/ special-float |
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float-int-part = dec-int |
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frac = decimal-point zero-prefixable-int |
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decimal-point = %x2E ; . |
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zero-prefixable-int = DIGIT *( DIGIT / underscore DIGIT ) |
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exp = "e" float-exp-part |
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float-exp-part = [ minus / plus ] zero-prefixable-int |
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special-float = [ minus / plus ] ( inf / nan ) |
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inf = %x69.6e.66 ; inf |
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nan = %x6e.61.6e ; nan |
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;; Boolean |
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boolean = true / false |
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true = %x74.72.75.65 ; true |
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false = %x66.61.6C.73.65 ; false |
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;; Date and Time (as defined in RFC 3339) |
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date-time = offset-date-time / local-date-time / local-date / local-time |
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date-fullyear = 4DIGIT |
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date-month = 2DIGIT ; 01-12 |
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date-mday = 2DIGIT ; 01-28, 01-29, 01-30, 01-31 based on month/year |
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time-delim = "T" / %x20 ; T, t, or space |
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time-hour = 2DIGIT ; 00-23 |
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time-minute = 2DIGIT ; 00-59 |
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time-second = 2DIGIT ; 00-58, 00-59, 00-60 based on leap second rules |
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time-secfrac = "." 1*DIGIT |
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time-numoffset = ( "+" / "-" ) time-hour ":" time-minute |
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time-offset = "Z" / time-numoffset |
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partial-time = time-hour ":" time-minute ":" time-second [ time-secfrac ] |
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full-date = date-fullyear "-" date-month "-" date-mday |
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full-time = partial-time time-offset |
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;; Offset Date-Time |
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offset-date-time = full-date time-delim full-time |
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;; Local Date-Time |
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local-date-time = full-date time-delim partial-time |
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;; Local Date |
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local-date = full-date |
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;; Local Time |
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local-time = partial-time |
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;; Array |
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array = array-open [ array-values ] ws-comment-newline array-close |
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array-open = %x5B ; [ |
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array-close = %x5D ; ] |
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array-values = ws-comment-newline val ws-comment-newline array-sep array-values |
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array-values =/ ws-comment-newline val ws-comment-newline [ array-sep ] |
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array-sep = %x2C ; , Comma |
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ws-comment-newline = *( wschar / [ comment ] newline ) |
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;; Table |
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table = std-table / array-table |
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;; Standard Table |
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std-table = std-table-open key std-table-close |
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std-table-open = %x5B ws ; [ Left square bracket |
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std-table-close = ws %x5D ; ] Right square bracket |
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;; Inline Table |
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inline-table = inline-table-open [ inline-table-keyvals ] inline-table-close |
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inline-table-open = %x7B ws ; { |
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inline-table-close = ws %x7D ; } |
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inline-table-sep = ws %x2C ws ; , Comma |
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inline-table-keyvals = keyval [ inline-table-sep inline-table-keyvals ] |
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;; Array Table |
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array-table = array-table-open key array-table-close |
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array-table-open = %x5B.5B ws ; [[ Double left square bracket |
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array-table-close = ws %x5D.5D ; ]] Double right square bracket |
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;; Built-in ABNF terms, reproduced here for clarity |
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ALPHA = %x41-5A / %x61-7A ; A-Z / a-z |
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DIGIT = %x30-39 ; 0-9 |
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HEXDIG = DIGIT / "A" / "B" / "C" / "D" / "E" / "F" |