diff options
Diffstat (limited to 'grammars/bpeg.bpeg')
| -rw-r--r-- | grammars/bpeg.bpeg | 26 |
1 files changed, 10 insertions, 16 deletions
diff --git a/grammars/bpeg.bpeg b/grammars/bpeg.bpeg index 0c43c0e..288ceee 100644 --- a/grammars/bpeg.bpeg +++ b/grammars/bpeg.bpeg @@ -1,43 +1,37 @@ # This is a file defining the BPEG grammar using BPEG syntax -Grammar: __ 0+(Def [__`;])%__ __ ($$ / @!={... => "Could not parse this code"}) +Grammar: __ *(Def [__`;])%__ __ ($$ / @!={... => "Could not parse this code"}) Def: @name=id _ `: __ ( @definition=extended-pat / $$ @!={=>"No definition for rule"} / @!={...>(`;/id_`:/$) => "Invalid definition: @0"}) # This is used for command line arguments: -String-pattern: 0+(`\ (escape-sequence / pat [`;]) / .) +String-pattern: *(`\ (escape-sequence / pat [`;]) / .) -pat: simple-pat !(__("!="/"=="/`*/`+/`?)) / suffixed-pat +pat: simple-pat !(__("!="/"==")) / suffixed-pat simple-pat: Upto-and / Dot / String / Char-range / Char / Escape-range / Escape / No / Nodent / Repeat / Optional / After / Before / Capture / Replace / Ref / parens suffixed-pat: ( Eq-pat / Not-eq-pat - / Star-pat - / Plus-pat - / Question-pat ) Eq-pat: @first=pat__"=="__@second=pat Not-eq-pat: @first=pat__"!="__@second=pat -Star-pat: pat __ `* @min={=>"0"} @max="" [__`%__@sep=pat] -Plus-pat: pat __ `+ @min={=>"1"} @max="" [__`%__@sep=pat] -Question-pat: pat __ `? Dot: `. !`. String: ( - `" @s=0+(Escape / !`".) (`" / @!={=> "Expected closing quote here"}) - / `' @s=0+(Escape / !`'.) (`' / @!={=> "Expected closing quote here"}) + `" @s=*(Escape / !`".) (`" / @!={=> "Expected closing quote here"}) + / `' @s=*(Escape / !`'.) (`' / @!={=> "Expected closing quote here"}) ) Char-range: `` @low=. `- (@high=. / @!={=> "Expected a second character to form a character range"}) Char: `` (@s=. / @!={=> "Expected a character following the '`'"}) Escape-range: `\ @low=escape-sequence `- @high=escape-sequence Escape: `\ (@s=escape-sequence / $ @!={=>"Backslashes are used for escape sequences, not splitting lines"} - / @!={. 0+(Abc/`0-9) => "Invalid escape sequence: '@0'"} + / @!={. *(Abc/`0-9) => "Invalid escape sequence: '@0'"} ) escape-sequence: ( `n/`t/`r/`e/`b/`a/`v @@ -68,17 +62,17 @@ Otherwise: 2+@(Chain/pat)%(__`/__) extended-pat: Otherwise / Chain / pat # Special-symbol rules: -_: 0+(` / \t) -__: 0+(` / \t / \r / \n / comment) +_: *(` / \t) +__: *(` / \t / \r / \n / comment) $$: !$. $: !. ^^: !<$. ^: !<. -id: "^^" / "^" / "__" / "_" / "$$" / "$" / (`a-z/`A-Z) 0+(`a-z/`A-Z/`0-9/`-) +id: "^^" / "^" / "__" / "_" / "$$" / "$" / (`a-z/`A-Z) *(`a-z/`A-Z/`0-9/`-) line-comment: `# .. $ -block-comment: "#(" 0+(block-comment / !")#" .) ")#" +block-comment: "#(" *(block-comment / !")#" .) ")#" # Note: comments are undefined by default in regular BPEG comment: block-comment / line-comment |