101 lines
1.8 KiB
OCaml
101 lines
1.8 KiB
OCaml
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/* The grammar for lexer definitions */
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%{
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open Syntax
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open Gram_aux
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%}
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%token <string> Tident
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%token <char> Tchar
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%token <string> Tstring
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%token <Syntax.location> Taction
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%token Trule Tparse Tand Tequal Tend Tor Tunderscore Teof Tlbracket Trbracket
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%token Tstar Tmaybe Tplus Tlparen Trparen Tcaret Tdash
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%left Tor
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%left CONCAT
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%nonassoc Tmaybe
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%left Tstar
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%left Tplus
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%start lexer_definition
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%type <Syntax.lexer_definition> lexer_definition
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%%
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lexer_definition:
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header Trule definition other_definitions Tend
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{ Lexdef($1, $3::(List.rev $4)) }
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;
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header:
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Taction
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{ $1 }
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{ Location(0,0) }
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;
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other_definitions:
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other_definitions Tand definition
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{ $3::$1 }
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{ [] }
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;
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definition:
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Tident Tequal entry
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{ ($1,$3) }
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;
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entry:
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Tparse case rest_of_entry
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{ $2 :: List.rev $3 }
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;
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rest_of_entry:
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rest_of_entry Tor case
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{ $3::$1 }
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{ [] }
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;
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case:
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regexp Taction
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{ ($1,$2) }
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;
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regexp:
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Tunderscore
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{ Characters all_chars }
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| Teof
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{ Characters ['\000'] }
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| Tchar
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{ Characters [$1] }
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| Tstring
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{ regexp_for_string $1 }
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| Tlbracket char_class Trbracket
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{ Characters $2 }
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| regexp Tstar
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{ Repetition $1 }
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| regexp Tmaybe
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{ Alternative($1, Epsilon) }
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| regexp Tplus
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{ Sequence($1, Repetition $1) }
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| regexp Tor regexp
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{ Alternative($1,$3) }
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| regexp regexp %prec CONCAT
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{ Sequence($1,$2) }
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| Tlparen regexp Trparen
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{ $2 }
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;
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char_class:
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Tcaret char_class1
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{ subtract all_chars $2 }
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| char_class1
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{ $1 }
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;
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char_class1:
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Tchar Tdash Tchar
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{ char_class $1 $3 }
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| Tchar
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{ [$1] }
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| char_class char_class %prec CONCAT
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{ $1 @ $2 }
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;
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%%
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