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