bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/internal/parsing/parser/SCL.grammar

   1
   2 /******************************************************************************
   3  * Initial
   4  */
   5
   6 initial module ;
   7 initial commands ;
   8 initial import ;
   9 initial type ;
  10 initial exp ;
  11 initial equationBlock ;
  12
  13 module
  14     = (declaration (SEMICOLON declaration)*)?                # Module
  15     ;
  16
  17 commands
  18     = command?                                               # OneCommand
  19     | commands SEMICOLON command                             # ManyCommands
  20     ;
  21
  22 command
  23     = statement                                              # StatementCommand
  24     | import                                                 # ImportCommand
  25     ;
  26
  27 /******************************************************************************
  28  * Declarations
  29  */
  30
  31 declarations
  32     = LBRACE (declaration (SEMICOLON declaration)*)? RBRACE  # Declarations
  33     ;
  34
  35 declaration
  36     = MODULE LBRACE (field (COMMA field)*)? RBRACE           # ModuleHeader
  37     | var (COMMA var)* HASTYPE type                          # TypeAnnotation
  38     | bexp rhs                                               # ValueDefinition
  39     | DATA ID+ (EQUALS constructor (BAR constructor)*)?      # DataDefinition
  40     | TYPE ID+ EQUALS type                                   # TypeDefinition
  41     | CLASS context? ID+
  42       (BAR fundeps)?
  43       (WHERE declarations)?                                  # ClassDefinition
  44     | INSTANCE context? ID atype+ (WHERE declarations)?      # InstanceDefinition
  45     | DERIVING INSTANCE context? ID atype+                   # DerivingInstanceDefinition
  46     | BEGIN_STRING END_STRING                                # DocumentationString
  47     | ANNOTATION_ID aexp*                                    # Annotation
  48     | (INFIX | INFIXL | INFIXR) INTEGER var (COMMA var)*     # PrecedenceDefinition
  49     | import                                                 # JustImport
  50     | IMPORTJAVA BEGIN_STRING END_STRING WHERE declarations  # ImportJava
  51     | EFFECT ID BEGIN_STRING END_STRING
  52                 BEGIN_STRING END_STRING                      # EffectDefinition
  53     | (RULE | ABSTRACT_RULE) ID
  54       (EXTENDS ID (COMMA ID)*)?
  55       WHERE ruleDeclarations                                 # RuleDefinition
  56     | MAPPING_RELATION ID atype*                             # MappingRelationDefinition
  57     | bexp FOLLOWS ruleDeclarations                          # RelationDefinition
  58     ;
  59
  60 import
  61     = (IMPORT | INCLUDE)
  62       BEGIN_STRING END_STRING
  63       (AS ID)?
  64       importSpec?                                            # Import
  65     ;
  66
  67 importSpec
  68     = LPAREN (importItem (COMMA importItem)*)? RPAREN         # ImportShowing
  69     | HIDING LPAREN (importItem (COMMA importItem)*)? RPAREN  # ImportHiding
  70     ;
  71
  72 importItem
  73     = ID                                                      # ImportValueItem
  74 //    | (TYPE | DATA) ID                                        # ImportTypeItem
  75 //    | CLASS ID                                                # ImportClassItem
  76     ;
  77
  78
  79 constructor
  80     = (ANNOTATION_ID aexp)* ID atype*                        # Constructor
  81     | (ANNOTATION_ID aexp)* ID LBRACE
  82           fieldDeclaration (COMMA fieldDeclaration)* RBRACE  # RecordConstructor
  83     ;
  84
  85 fieldDeclaration
  86     = ID HASTYPE type                                        # FieldDescription
  87     ;
  88
  89 rhs = EQUALS exp (WHERE statements)?                         # SimpleRhs
  90     | guardedExpEq+ (WHERE statements)?                      # GuardedRhs
  91     ;
  92
  93 guardedExpEq
  94     = BAR exp (COMMA exp)* EQUALS exp                        # GuardedExpEq
  95     ;
  96
  97 fundep
  98     = ID+ ARROW ID                                           # Fundep
  99     ;
 100
 101 fundeps
 102     = fundep (COMMA fundep)*                                 # Fundeps
 103     ;
 104
 105 /******************************************************************************
 106  * Rules
 107  */
 108
 109 ruleDeclarations
 110     = LBRACE (ruleDeclaration (SEMICOLON ruleDeclaration)*)? RBRACE  # RuleDeclarations
 111     ;
 112
 113 ruleDeclaration
 114     = query                                                  # QueryRuleDeclaration
 115     | ANNOTATION_ID aexp*                                    # Annotation
 116     ;
 117
 118 /******************************************************************************
 119  * Expressions
 120  */
 121
 122 exp = bexp (HASTYPE type)?                                   # LocalTypeAnnotation, shift HASTYPE, shift COLON
 123     | bexp COLON ID WITH? queryBlock?                        # EntityTypeAnnotation, shift LBRACE, shift WITH
 124     ;
 125
 126 bexp
 127     =  MINUS? lexp (symbol lexp)*                            # Binary, shift MINUS, shift SYMBOL,
 128                                                                shift LESS, shift GREATER, shift SEPARATED_DOT,
 129                                                                shift ESCAPED_ID
 130     ;
 131
 132 lexp
 133     = faexp+                                                 # Apply, shift ID, shift LAMBDA, shift LAMBDA_MATCH,
 134                                                                shift LET, shift INTEGER, shift BEGIN_STRING,
 135                                                                shift IF, shift MATCH, shift DO,
 136                                                                shift MDO, shift ENFORCE, shift BLANK,
 137                                                                shift FLOAT, shift LPAREN, shift LBRACKET,
 138                                                                shift ESCAPED_SYMBOL, shift CHAR, shift LBRACE,
 139                                                                shift WHEN, shift ATTACHED_HASH,
 140                                                                shift SELECT, shift SELECT_FIRST, shift SELECT_DISTINCT,
 141                                                                shift TRANSFORMATION, shift EQ
 142     ;
 143
 144 faexp
 145     = aexp ((ATTACHED_DOT | ATTACHED_HASH) accessor)*        # FieldAccess, shift ATTACHED_DOT, shift ATTACHED_HASH
 146     ;
 147
 148 accessor
 149     = ID                                                     # IdAccessor
 150     | BEGIN_STRING END_STRING                                # StringAccessor
 151     | LPAREN exp RPAREN                                      # ExpAccessor
 152     ;
 153
 154 aexp
 155     = LAMBDA aexp+ ARROW exp                                 # Lambda, shift HASTYPE
 156     | LAMBDA_MATCH LBRACE case (SEMICOLON case)* RBRACE      # LambdaMatch, shift HASTYPE
 157     | LET statements IN exp                                  # Let, shift HASTYPE
 158     | IF exp THEN exp (ELSE exp)?                            # If, shift HASTYPE, shift ELSE
 159     | MATCH exp WITH
 160       LBRACE case (SEMICOLON case)* RBRACE                   # Match
 161     | (DO | MDO) statements                                  # Do
 162     | (SELECT | SELECT_FIRST | SELECT_DISTINCT)
 163       exp WHERE queryBlock                                   # Select
 164     | ENFORCE queryBlock                                     # Enforce
 165     //| WHEN queryBlock SEMICOLON exp                          # When
 166     | var                                                    # Var
 167     | ATTACHED_HASH ID                                       # HashedId
 168     | BLANK                                                  # Blank
 169     | INTEGER                                                # Integer
 170     | FLOAT                                                  # Float
 171     | stringLiteral                                          # String
 172     | CHAR                                                   # Char
 173     | LPAREN (exp (COMMA exp)*)? RPAREN                      # Tuple
 174     | LPAREN exp ARROW exp RPAREN                            # ViewPattern
 175     | LPAREN symbolWithoutMinus lexp RPAREN                  # RightSection
 176     | LPAREN lexp symbol RPAREN                              # LeftSection
 177     | LBRACKET (exp (COMMA exp)*)? RBRACKET                  # ListLiteral
 178     | LBRACKET exp DOTDOT exp RBRACKET                       # Range
 179     | LBRACKET exp BAR
 180       listQualifier (COMMA listQualifier)* RBRACKET          # ListComprehension
 181     | ID AT aexp                                             # As
 182     | ID LBRACE (field (COMMA field)*)? RBRACE               # Record
 183     | TRANSFORMATION ID WHERE queryBlock                     # Transformation
 184     | EQ LBRACE equationBlock RBRACE                         # Eq
 185     ;
 186
 187 stringLiteral
 188     = BEGIN_STRING (SUSPEND_STRING exp CONTINUE_STRING)*
 189       END_STRING                                             # StringLiteral
 190     ;
 191
 192 statements
 193     = LBRACE (statement (SEMICOLON statement)*)? RBRACE      # Statements
 194     ;
 195
 196 statement
 197     = exp                                                    # GuardStatement
 198     | exp rhs                                                # LetStatement
 199     | exp BINDS exp                                          # BindStatement
 200     | exp FOLLOWS queryBlock                                 # RuleStatement
 201     | chrQuery IMPLIES chrQuery                              # CHRStatement
 202     | WHEN verboseChrQuery THEN_AFTER_WHEN verboseChrQuery   # VerboseCHRStatement
 203     | CONSTRAINT ID atype*                                   # ConstraintStatement
 204     ;
 205
 206 chrQuery
 207     = listQualifier (COMMA listQualifier)*                   # CHRQuery
 208     ;
 209
 210 verboseChrQuery
 211     = LBRACE listQualifier (SEMICOLON listQualifier)* RBRACE # VerboseCHRQuery
 212     ;
 213
 214 listQualifier
 215     = exp                                                    # GuardQualifier
 216     | exp EQUALS exp                                         # LetQualifier
 217     | exp BINDS exp                                          # BindQualifier
 218     | THEN exp (BY exp)?                                     # ThenQualifier
 219     ;
 220
 221 case
 222     = exp caseRhs                                            # Case
 223     ;
 224
 225 caseRhs
 226     = ARROW exp (WHERE statements)?                          # SimpleCaseRhs
 227     | guardedExpArrow+ (WHERE statements)?                   # GuardedCaseRhs
 228     ;
 229
 230 guardedExpArrow
 231     = BAR exp (COMMA exp)* ARROW exp                         # GuardedExpArrow
 232     ;
 233
 234 field
 235     = ID EQUALS exp                                          # Field
 236     | ID                                                     # FieldShorthand
 237     ;
 238
 239 /******************************************************************************
 240  * Queries
 241  */
 242
 243 queryBlock
 244     = LBRACE (query (SEMICOLON query)*)? RBRACE              # QueryBlock
 245     ;
 246
 247 query
 248     = exp                                                    # GuardQuery, shift BINDS, shift EQUALS
 249     | exp EQUALS exp                                         # EqualsQuery
 250     | exp BINDS exp                                          # BindQuery
 251     | QUERY_OP queryBlock                                    # CompositeQuery
 252     ;
 253
 254 /******************************************************************************
 255  * Equations
 256  */
 257
 258 equationBlock
 259     = (equation (SEMICOLON equation)*)?                      # EquationBlock
 260     ;
 261
 262 equation
 263     = exp                                                    # GuardEquation
 264     | exp EQUALS exp                                         # BasicEquation
 265     ;
 266
 267 /******************************************************************************
 268  * Types
 269  */
 270
 271 context
 272     = LPAREN type (COMMA type)* RPAREN IMPLIES               # Context
 273     ;
 274
 275 type
 276     = etype ((ARROW | IMPLIES) etype)*                       # Arrow, shift ARROW, shift IMPLIES
 277     ;
 278
 279 etype
 280     = LESS ID (COMMA ID)* GREATER btype                      # Effect
 281     | btype                                                  # JustEtype
 282     | FORALL ID+ (SEPARATED_DOT | ATTACHED_DOT) type         # ForAll
 283     ;
 284
 285 btype
 286     = atype+                                                 # ApplyType, shift ID, shift LPAREN,
 287                                                                shift LBRACKET
 288     ;
 289
 290 atype
 291     = ID                                                     # TypeVar
 292     | LPAREN (type (COMMA type)*)? RPAREN                    # TupleType
 293     | LBRACKET type RBRACKET                                 # ListType
 294     | LBRACKET RBRACKET                                      # ListTypeConstructor
 295     | LPAREN COMMA+ RPAREN                                   # TupleTypeConstructor
 296     ;
 297
 298 /******************************************************************************
 299  * Variables and symbols
 300  */
 301
 302 var = ID                                                     # VarId
 303     | ESCAPED_SYMBOL                                         # EscapedSymbol
 304     | LPAREN COMMA+ RPAREN                                   # TupleConstructor
 305     ;
 306
 307 symbol
 308     = SYMBOL                                                 # Symbol
 309     | ESCAPED_ID                                             # EscapedId
 310     | MINUS                                                  # Minus
 311     | LESS                                                   # Less
 312     | GREATER                                                # Greater
 313     | SEPARATED_DOT                                          # Dot
 314     ;
 315
 316 symbolWithoutMinus
 317     = SYMBOL                                                 # Symbol
 318     | ESCAPED_ID                                             # EscapedId
 319     | LESS                                                   # Less
 320     | GREATER                                                # Greater
 321     | SEPARATED_DOT                                          # Dot
 322     ;
 323
 324 /******************************************************************************
 325  * Auxiliary tokens
 326  */
 327 dummy = COMMENT EOL                                          # Dummy
 328       ;