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     | RULESET ID WHERE statements                            # RulesetDefinition
  59     ;
  60
  61 import
  62     = (IMPORT | INCLUDE)
  63       BEGIN_STRING END_STRING
  64       (AS ID)?
  65       importSpec?                                            # Import
  66     ;
  67
  68 importSpec
  69     = LPAREN (importItem (COMMA importItem)*)? RPAREN         # ImportShowing
  70     | HIDING LPAREN (importItem (COMMA importItem)*)? RPAREN  # ImportHiding
  71     ;
  72
  73 importItem
  74     = ID                                                      # ImportValueItem
  75 //    | (TYPE | DATA) ID                                        # ImportTypeItem
  76 //    | CLASS ID                                                # ImportClassItem
  77     ;
  78
  79
  80 constructor
  81     = (ANNOTATION_ID aexp)* ID atype*                        # Constructor
  82     | (ANNOTATION_ID aexp)* ID LBRACE
  83           fieldDeclaration (COMMA fieldDeclaration)* RBRACE  # RecordConstructor
  84     ;
  85
  86 fieldDeclaration
  87     = ID HASTYPE type                                        # FieldDescription
  88     ;
  89
  90 rhs = EQUALS exp (WHERE statements)?                         # SimpleRhs
  91     | guardedExpEq+ (WHERE statements)?                      # GuardedRhs
  92     ;
  93
  94 guardedExpEq
  95     = BAR exp (COMMA exp)* EQUALS exp                        # GuardedExpEq
  96     ;
  97
  98 fundep
  99     = ID+ ARROW ID                                           # Fundep
 100     ;
 101
 102 fundeps
 103     = fundep (COMMA fundep)*                                 # Fundeps
 104     ;
 105
 106 /******************************************************************************
 107  * Rules
 108  */
 109
 110 ruleDeclarations
 111     = LBRACE (ruleDeclaration (SEMICOLON ruleDeclaration)*)? RBRACE  # RuleDeclarations
 112     ;
 113
 114 ruleDeclaration
 115     = query                                                  # QueryRuleDeclaration
 116     | ANNOTATION_ID aexp*                                    # Annotation
 117     ;
 118
 119 /******************************************************************************
 120  * Expressions
 121  */
 122
 123 exp = bexp (HASTYPE type)?                                   # LocalTypeAnnotation, shift HASTYPE, shift COLON
 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, shift CHR_SELECT
 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     | CHR_SELECT
 165       exp WHERE verboseChrQuery                              # CHRSelect
 166     | ENFORCE queryBlock                                     # Enforce
 167     //| WHEN queryBlock SEMICOLON exp                          # When
 168     | var                                                    # Var
 169     | ATTACHED_HASH ID                                       # HashedId
 170     | BLANK                                                  # Blank
 171     | INTEGER                                                # Integer
 172     | FLOAT                                                  # Float
 173     | stringLiteral                                          # String
 174     | CHAR                                                   # Char
 175     | LPAREN (exp (COMMA exp)*)? RPAREN                      # Tuple
 176     | LPAREN exp ARROW exp RPAREN                            # ViewPattern
 177     | LPAREN symbolWithoutMinus lexp RPAREN                  # RightSection
 178     | LPAREN lexp symbol RPAREN                              # LeftSection
 179     | LBRACKET (exp (COMMA exp)*)? RBRACKET                  # ListLiteral
 180     | LBRACKET exp DOTDOT exp RBRACKET                       # Range
 181     | LBRACKET exp BAR
 182       listQualifier (COMMA listQualifier)* RBRACKET          # ListComprehension
 183     | ID AT aexp                                             # As
 184     | ID LBRACE (field (COMMA field)*)? RBRACE               # Record
 185     | TRANSFORMATION ID WHERE queryBlock                     # Transformation
 186     | EQ LBRACE equationBlock RBRACE                         # Eq
 187     ;
 188
 189 stringLiteral
 190     = BEGIN_STRING (SUSPEND_STRING exp CONTINUE_STRING)*
 191       END_STRING                                             # StringLiteral
 192     ;
 193
 194 statements
 195     = LBRACE (statement (SEMICOLON statement)*)? RBRACE      # Statements
 196     ;
 197
 198 statement
 199     = exp                                                    # GuardStatement
 200     | exp rhs                                                # LetStatement
 201     | exp BINDS exp                                          # BindStatement
 202     | exp FOLLOWS queryBlock                                 # RuleStatement
 203     | chrQuery IMPLIES chrQuery                              # CHRStatement
 204     | WHEN verboseChrQuery THEN_AFTER_WHEN verboseChrQuery   # VerboseCHRStatement
 205     | CONSTRAINT constructor                                 # ConstraintStatement
 206     | INCLUDE ID aexp                                        # LocalInclude
 207     ;
 208
 209 chrQuery
 210     = listQualifier (COMMA listQualifier)*                   # CHRQuery
 211     ;
 212
 213 verboseChrQuery
 214     = LBRACE listQualifier (SEMICOLON listQualifier)* RBRACE # VerboseCHRQuery
 215     ;
 216
 217 listQualifier
 218     = exp                                                    # GuardQualifier
 219     | exp EQUALS exp                                         # LetQualifier
 220     | exp BINDS exp                                          # BindQualifier
 221     | THEN exp (BY exp)?                                     # ThenQualifier
 222     ;
 223
 224 case
 225     = exp caseRhs                                            # Case
 226     ;
 227
 228 caseRhs
 229     = ARROW exp (WHERE statements)?                          # SimpleCaseRhs
 230     | guardedExpArrow+ (WHERE statements)?                   # GuardedCaseRhs
 231     ;
 232
 233 guardedExpArrow
 234     = BAR exp (COMMA exp)* ARROW exp                         # GuardedExpArrow
 235     ;
 236
 237 field
 238     = ID EQUALS exp                                          # Field
 239     | ID                                                     # FieldShorthand
 240     ;
 241
 242 /******************************************************************************
 243  * Queries
 244  */
 245
 246 queryBlock
 247     = LBRACE (query (SEMICOLON query)*)? RBRACE              # QueryBlock
 248     ;
 249
 250 query
 251     = exp                                                    # GuardQuery, shift BINDS, shift EQUALS
 252     | exp EQUALS exp                                         # EqualsQuery
 253     | exp BINDS exp                                          # BindQuery
 254     | QUERY_OP queryBlock                                    # CompositeQuery
 255     ;
 256
 257 /******************************************************************************
 258  * Equations
 259  */
 260
 261 equationBlock
 262     = (equation (SEMICOLON equation)*)?                      # EquationBlock
 263     ;
 264
 265 equation
 266     = exp                                                    # GuardEquation
 267     | exp EQUALS exp                                         # BasicEquation
 268     ;
 269
 270 /******************************************************************************
 271  * Types
 272  */
 273
 274 context
 275     = LPAREN type (COMMA type)* RPAREN IMPLIES               # Context
 276     ;
 277
 278 type
 279     = etype ((ARROW | IMPLIES) etype)*                       # Arrow, shift ARROW, shift IMPLIES
 280     ;
 281
 282 etype
 283     = LESS ID (COMMA ID)* GREATER btype                      # Effect
 284     | btype                                                  # JustEtype
 285     | FORALL ID+ (SEPARATED_DOT | ATTACHED_DOT) type         # ForAll
 286     ;
 287
 288 btype
 289     = atype+                                                 # ApplyType, shift ID, shift LPAREN,
 290                                                                shift LBRACKET
 291     ;
 292
 293 atype
 294     = ID                                                     # TypeVar
 295     | LPAREN (type (COMMA type)*)? RPAREN                    # TupleType
 296     | LBRACKET type RBRACKET                                 # ListType
 297     | LBRACKET RBRACKET                                      # ListTypeConstructor
 298     | LPAREN COMMA+ RPAREN                                   # TupleTypeConstructor
 299     ;
 300
 301 /******************************************************************************
 302  * Variables and symbols
 303  */
 304
 305 var = ID                                                     # VarId
 306     | ESCAPED_SYMBOL                                         # EscapedSymbol
 307     | LPAREN COMMA+ RPAREN                                   # TupleConstructor
 308     ;
 309
 310 symbol
 311     = SYMBOL                                                 # Symbol
 312     | ESCAPED_ID                                             # EscapedId
 313     | MINUS                                                  # Minus
 314     | LESS                                                   # Less
 315     | GREATER                                                # Greater
 316     | SEPARATED_DOT                                          # Dot
 317     ;
 318
 319 symbolWithoutMinus
 320     = SYMBOL                                                 # Symbol
 321     | ESCAPED_ID                                             # EscapedId
 322     | LESS                                                   # Less
 323     | GREATER                                                # Greater
 324     | SEPARATED_DOT                                          # Dot
 325     ;
 326
 327 /******************************************************************************
 328  * Auxiliary tokens
 329  */
 330 dummy = COMMENT EOL                                          # Dummy
 331       ;