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package torimatomeru
import language.implicitConversions
import syntax._
import org.parboiled2._
class ScalaSyntax(val input: ParserInput) extends Parser with Basic with Identifiers with Literals {
type B = Boolean
def Whitespace = rule { zeroOrMore(WhitespaceChar | Comment) }
def WhiteLines = rule{ zeroOrMore(WhitespaceChar | Comment | Newline) }
def White(G: B = true) =
if (G) WhiteLines
else Whitespace
/**
* Every token handles space at the end.
* Don't let it propagate to mixins
*/
implicit private[this] def wspStr(s: String): Rule0 = rule {
str(s) ~ WhiteLines
}
def wspStrG(s: String, G: B): Rule0 = rule {
str(s) ~ White(G)
}
implicit private[this] def wspChar(s: Char): Rule0 = rule {
ch(s) ~ WhiteLines
}
def pos = cursor -> cursorChar
/**
* helper printing function
*/
def pr(s: String) = rule { run(print(s)) }
//////////////////////////////////////////////////
// Override rules from dependencies
// in order to handle white spaces
// Note: when you add your AST, make sure to
// only capture super.rule and not the whitespace
//////////////////////////////////////////////////
def IdS(G: B = true) = rule { super.Id ~ White(G)}
def VarIdS(G: B = true) = rule { super.VarId ~ White(G) }
def LiteralS(G: B = true) = rule { super.Literal ~ White(G) }
def SemiS = rule { super.Semi ~ WhiteLines }
def NewlineS = rule { super.Newline ~ WhiteLines }
///////////////////////////////////////////
// Qualifiers and Ids
///////////////////////////////////////////
def QualId = rule { oneOrMore(IdS()) separatedBy '.' }
def Ids = rule { oneOrMore(IdS()) separatedBy ',' }
//path and stableId were refactored (wrt spec) to avoid recursiveness and be more specific
def Path(G: B = true): Rule0 = rule { zeroOrMore(IdS(G) ~ '.') ~ "this" ~ zeroOrMore(IdS(G)).separatedBy('.') | StableId(G) }
def StableId(G: B = true): Rule0 = rule {
zeroOrMore(IdS() ~ '.') ~ ("this" | "super" ~ optional(ClassQualifier)) ~ '.' ~ oneOrMore(IdS(G)).separatedBy('.') |
IdS(G) ~ zeroOrMore('.' ~ IdS(G))
}
// def StableId: Rule0 = rule { zeroOrMore(Id ~ '.') ~ optional("this" | "super" ~ optional(ClassQualifier)) ~ oneOrMore(Id).separatedBy('.') }
def ClassQualifier = rule { '[' ~ IdS() ~ ']' }
///////////////////////////////////////////
// Types and more Types
///////////////////////////////////////////
def Type: Rule0 = rule { FunctionArgTypes ~ "=>" ~ Type | InfixType ~ optional(ExistentialClause) }
def FunctionArgTypes = rule { InfixType | '(' ~ optional(oneOrMore(ParamType) separatedBy ',') ~ ')' }
def ExistentialClause = rule { "forSome" ~ '{' ~ oneOrMore(ExistentialDcl).separatedBy(SemiS) }
def ExistentialDcl = rule { "type" ~ TypeDcl | "val" ~ ValDcl }
def InfixType = rule { CompoundType ~ zeroOrMore(IdS() ~ optional(NewlineS) ~ CompoundType) }
def CompoundType = rule { oneOrMore(AnnotType).separatedBy("with") ~ optional(Refinement) }
def AnnotType = rule { SimpleType ~ zeroOrMore(Annotation) }
def SimpleType: Rule0 = rule {
BasicType ~ optional('#' ~ IdS()) ~ optional(TypeArgs)
}
def BasicType: Rule0 = rule {
'(' ~ Types ~ ')' |
Path() ~ '.' ~ "type" |
StableId()
}
def TypeArgs = rule { '[' ~ Types ~ ']' }
def Types = rule { oneOrMore(Type).separatedBy(',') }
def Refinement = rule { optional(NewlineS) ~ '{' ~ oneOrMore(RefineStat).separatedBy(SemiS) ~ '}' }
def RefineStat = rule { "type" ~ TypeDef | Dcl | MATCH }
def TypePat = rule { Type }
def Ascription = rule { ":" ~ (InfixType | oneOrMore(Annotation) | "_" ~ "*") }
def ParamType = rule { "=>" ~ Type | Type ~ "*" | Type }
/////////////////////////////////////////////////
// Declarations, Expressions and Pattern Matching
/////////////////////////////////////////////////
def Expr(G: B = true): Rule0 = rule { (Bindings | optional("implicit") ~ IdS() | "_") ~ "=>" ~ Expr(G) | Expr1(G) }
def Expr1(G: B = true): Rule0 = rule {
IfCFlow(G) |
WhileCFlow(G) |
TryCFlow(G) |
DoWhileCFlow(G) |
ForCFlow(G) |
"throw" ~ Expr(G) |
"return" ~ optional(Expr(G)) |
SimpleExpr() ~ ArgumentExprs() ~ '=' ~ Expr(G) |
optional(SimpleExpr() ~ '.') ~ IdS() ~ '=' ~ Expr(G) |
PostfixExpr(G) ~ optional("match" ~ '{' ~ CaseClauses ~ '}' | Ascription)
}
def IfCFlow(G: B = true) = rule { "if" ~ '(' ~ Expr() ~ ')' ~ zeroOrMore(NewlineS) ~ Expr(G) ~ optional(optional(SemiS) ~ "else" ~ Expr(G)) }
def WhileCFlow(G: B = true) = rule { "while" ~ '(' ~ Expr() ~ ')' ~ zeroOrMore(NewlineS) ~ Expr(G) }
def TryCFlow(G: B = true) = rule { "try" ~ '{' ~ Block ~ wspStrG("}", G) ~ optional("catch" ~ '{' ~ CaseClauses ~ wspStrG("}", G)) ~ optional("finally" ~ Expr(G)) }
def DoWhileCFlow(G: B = true) = rule { "do" ~ Expr() ~ optional(SemiS) ~ "while" ~ '(' ~ Expr() ~ wspStrG(")", G) }
def ForCFlow(G: B = true) = rule { "for" ~ ('(' ~ Enumerators ~ ')' | '{' ~ Enumerators ~ '}') ~ zeroOrMore(NewlineS) ~ optional("yield") ~ Expr(G) }
def PostfixExpr(G: B = true): Rule0 = rule { InfixExpr(G) ~ optional(IdS() ~ optional(NewlineS)) }
def InfixExpr(G: B = true): Rule0 = rule { PrefixExpr(G) ~ zeroOrMore(IdS() ~ optional(NewlineS) ~ PrefixExpr(G)) }
def PrefixExpr(G: B = true) = rule { optional(anyOf("-+~!")) ~ SimpleExpr(G) }
def SimpleExpr(G: B = true): Rule0 = rule {
SimpleExpr1(G) ~ zeroOrMore('.' ~ IdS() | TypeArgs | ArgumentExprs(G)) ~ optional('_')
}
def SimpleExpr1(G: B = true) = rule{
"new" ~ (ClassTemplate(G) | TemplateBody(G)) |
BlockExpr(G) |
LiteralS() ~ drop[String] |
Path(G) |
'_' |
'(' ~ optional(Exprs) ~ wspStrG(")", G)
}
def Exprs: Rule0 = rule { oneOrMore(Expr()).separatedBy(',') }
def ArgumentExprs(G: B = true): Rule0 = rule {
'(' ~ (optional(Exprs ~ ',') ~ PostfixExpr() ~ ':' ~ '_' ~ '*' | optional(Exprs)) ~ ')' |
optional(NewlineS) ~ BlockExpr(G)
}
def BlockExpr(G: B = true): Rule0 = rule { '{' ~ (CaseClauses | Block) ~ wspStrG("}", G) }
def Block: Rule0 = rule { zeroOrMore(BlockStat ~ SemiS) ~ optional(ResultExpr()) }
def BlockStat: Rule0 = rule {
&(SemiS) ~ MATCH | //shortcircuit when Semi is found
Import(false) |
zeroOrMore(Annotation) ~ (optional("implicit" | "lazy") ~ Def(false) | zeroOrMore(LocalModifier) ~ TmplDef(false)) |
Expr1(false)
}
def ResultExpr(G: B = true): Rule0 = rule { (Bindings | optional("implicit") ~ IdS() | "_") ~ "=>" ~ Block | Expr1(true) }
def Enumerators: Rule0 = rule { Generator ~ zeroOrMore(SemiS ~ Enumerator) }
def Enumerator: Rule0 = rule { Generator | Guard | Pattern1 ~ '=' ~ Expr() }
def Generator: Rule0 = rule { Pattern1 ~ "<-" ~ Expr() ~ optional(Guard) }
def CaseClauses: Rule0 = rule { oneOrMore(CaseClause) }
def CaseClause: Rule0 = rule { "case" ~ Pattern ~ optional(Guard) ~ "=>" ~ Block }
def Guard: Rule0 = rule { "if" ~ PostfixExpr() }
def Pattern: Rule0 = rule { oneOrMore(Pattern1) separatedBy '|' }
def Pattern1: Rule0 = rule { '_' ~ ':' ~ TypePat | VarIdS() ~ ':' ~ TypePat | Pattern2 }
def Pattern2: Rule0 = rule { VarIdS() ~ optional("@" ~ Pattern3) | Pattern3 }
def Pattern3: Rule0 = rule { SimplePattern ~ zeroOrMore(IdS() ~ optional(NewlineS) ~ SimplePattern) } // this pattern doesn't make sense to me...
def SimplePattern: Rule0 = rule {
'_' |
LiteralS() ~ drop[String] | //literal currently captures, so it can be used outside. but since all our rules lack AST, we drop its value in order to be able to compose them
'(' ~ optional(Patterns) ~ ')' |
StableId() ~ '(' ~ (optional(Patterns ~ ',') ~ optional(VarIdS() ~ '@') ~ '_' ~ '*' | optional(Patterns)) ~ ')' |
VarIdS() /*|
XmlPattern*/
}
def Patterns: Rule0 = rule { '_' ~ '*' | oneOrMore(Pattern).separatedBy(',') }
def TypeParamClause: Rule0 = rule { '[' ~ oneOrMore(VariantTypeParam).separatedBy(',') ~ ']' }
def FunTypeParamClause: Rule0 = rule { '[' ~ oneOrMore(TypeParam).separatedBy(',') ~ ']' }
def VariantTypeParam: Rule0 = rule { zeroOrMore(Annotation) ~ optional(anyOf("+-")) ~ TypeParam }
def TypeParam: Rule0 = rule { (IdS() | '_') ~ optional(TypeParamClause) ~ optional(">:" ~ Type) ~ optional("<:" ~ Type) ~ zeroOrMore("<%" ~ Type) ~ zeroOrMore(':' ~ Type) }
def ParamClauses: Rule0 = rule { zeroOrMore(ParamClause) ~ optional(optional(NewlineS) ~ '(' ~ "implicit" ~ Params ~ ')') }
def ParamClause: Rule0 = rule { optional(NewlineS) ~ '(' ~ optional(Params) ~ ')' }
def Params: Rule0 = rule { zeroOrMore(Param).separatedBy(',') }
def Param: Rule0 = rule { zeroOrMore(Annotation) ~ IdS() ~ optional(':' ~ ParamType) ~ optional('=' ~ Expr()) }
def ClassParamClauses(G: B = true): Rule0 = rule { zeroOrMore(ClassParamClause(G)) ~ optional(optional(NewlineS) ~ '(' ~ "implicit" ~ ClassParam ~ wspStrG(")", G)) }
def ClassParamClause(G: B = true): Rule0 = rule { optional(NewlineS) ~ '(' ~ optional(ClassParams) ~ wspStrG(")", G) }
def ClassParams: Rule0 = rule { oneOrMore(ClassParam).separatedBy(',') }
def ClassParam: Rule0 = rule { zeroOrMore(Annotation) ~ optional(zeroOrMore(Modifier) ~ ("val" | "var")) ~ IdS() ~ ":" ~ ParamType ~ optional("=" ~ Expr()) }
def Bindings: Rule0 = rule { '(' ~ oneOrMore(Binding).separatedBy(',') ~ ')' }
def Binding: Rule0 = rule { (IdS() | '_') ~ optional(':' ~ Type) }
def Modifier: Rule0 = rule { LocalModifier | AccessModifier | "override" }
def LocalModifier: Rule0 = rule { "abstract" | "final" | "sealed" | "implicit" | "lazy" }
def AccessModifier: Rule0 = rule { ("private" | "protected") ~ optional(AccessQualifier) }
def AccessQualifier: Rule0 = rule { '[' ~ ("this" ~ IdS()) ~ ']' }
def Annotation: Rule0 = rule { '@' ~ SimpleType ~ zeroOrMore(ArgumentExprs()) }
def ConstrAnnotation: Rule0 = rule { '@' ~ SimpleType ~ ArgumentExprs() }
def TemplateBody(G: B = true): Rule0 = rule { optional(NewlineS) ~ '{' ~ optional(SelfType) ~ TemplateStat(false) ~ zeroOrMore(SemiS ~ TemplateStat(false)) ~ wspStrG("}", G) }
def TemplateStat(G: B = true): Rule0 = rule {
Import(false) |
zeroOrMore(Annotation ~ optional(NewlineS)) ~ zeroOrMore(Modifier) ~ (Def(G) | Dcl) |
Expr(false) |
MATCH
}
def SelfType: Rule0 = rule { "this" ~ ':' ~ Type ~ "=>" | IdS() ~ optional(':' ~ Type) ~ "=>" }
def Import(G: B = true): Rule0 = rule { "import" ~ oneOrMore(ImportExpr(G)).separatedBy(',') }
//ImportExpr is slightly changed wrt spec because StableId always consumes all the Ids possible, so there is no need to one at the end
def ImportExpr(G: B = true): Rule0 = rule { StableId(G) ~ optional('.' ~ ('_' | ImportSelectors(G))) }
def ImportSelectors(G: B = true): Rule0 = rule { '{' ~ zeroOrMore(ImportSelector ~ ',') ~ (ImportSelector | '_') ~ wspStrG("}", G) }
def ImportSelector: Rule0 = rule { IdS() ~ optional("=>" ~ (IdS() | '_')) }
def Dcl: Rule0 = rule {
"val" ~ ValDcl |
"var" ~ VarDcl |
"def" ~ FunDcl |
"type" ~ zeroOrMore(NewlineS) ~ TypeDcl
}
def ValDcl: Rule0 = rule { Ids ~ ':' ~ Type }
def VarDcl: Rule0 = rule { Ids ~ ':' ~ Type }
def FunDcl: Rule0 = rule { FunSig ~ optional(':' ~ Type) }
def FunSig: Rule0 = rule { IdS() ~ optional(FunTypeParamClause) ~ ParamClauses }
def TypeDcl: Rule0 = rule { IdS() ~ optional(TypeParamClause) ~ optional(">:" ~ Type) ~ optional("<:" ~ Type) }
def PatVarDef(G: B = true): Rule0 = rule { "val" ~ PatDef(G) | "var" ~ VarDef(G) }
def Def(G: B = true): Rule0 = rule { "def" ~ FunDef(G) | "type" ~ zeroOrMore(NewlineS) ~ TypeDef | PatVarDef(G) | TmplDef(G) }
def PatDef(G: B = true): Rule0 = rule { oneOrMore(Pattern2).separatedBy(',') ~ optional(':' ~ Type) ~ '=' ~ Expr(G) }
def VarDef(G: B = true): Rule0 = rule { Ids ~ ':' ~ Type ~ '=' ~ '_' | PatDef(G) }
def FunDef(G: B = true): Rule0 = rule {
"this" ~ ParamClause ~ ParamClauses ~ ('=' ~ ConstrExpr | optional(NewlineS) ~ ConstrBlock) |
FunSig ~ (optional(':' ~ Type) ~ '=' ~ Expr(G) | optional(NewlineS) ~ '{' ~ Block ~ '}')
}
def TypeDef: Rule0 = rule { IdS() ~ optional(TypeParamClause) ~ '=' ~ Type }
def TmplDef(G: B = true): Rule0 = rule { "trait" ~ TraitDef(G) | optional("case") ~ ("class" ~ ClassDef(G) | "object" ~ ObjectDef(G)) }
def ClassDef(G: B = true): Rule0 = rule { IdS() ~ optional(TypeParamClause) ~ zeroOrMore(ConstrAnnotation) ~ optional(AccessModifier) ~ ClassParamClauses(G) ~ ClassTemplateOpt(G) }
def TraitDef(G: B = true): Rule0 = rule { IdS() ~ optional(TypeParamClause) ~ TraitTemplateOpt(G) }
def ObjectDef(G: B = true): Rule0 = rule { IdS() ~ ClassTemplateOpt(G) }
def ClassTemplateOpt(G: B = true): Rule0 = rule { "extends" ~ ClassTemplate(G) | optional(optional("extends") ~ TemplateBody(G)) }
def TraitTemplateOpt(G: B = true): Rule0 = rule { "extends" ~ TraitTemplate(G) | optional(optional("extends") ~ TemplateBody(G)) }
def ClassTemplate(G: B = true): Rule0 = rule { optional(EarlyDefs) ~ ClassParents ~ optional(TemplateBody(G)) }
def TraitTemplate(G: B = true): Rule0 = rule { optional(EarlyDefs) ~ TraitParents ~ optional(TemplateBody(G)) }
def ClassParents: Rule0 = rule { Constr ~ zeroOrMore("with" ~ AnnotType) }
def TraitParents: Rule0 = rule { AnnotType ~ zeroOrMore("with" ~ AnnotType) }
def Constr: Rule0 = rule { AnnotType ~ zeroOrMore(ArgumentExprs()) }
def EarlyDefs: Rule0 = rule { '{' ~ optional(oneOrMore(EarlyDef).separatedBy(SemiS)) ~ '}' ~ "with" }
def EarlyDef: Rule0 = rule { zeroOrMore(Annotation ~ optional(NewlineS)) ~ zeroOrMore(Modifier) ~ PatVarDef(false) }
def ConstrExpr: Rule0 = rule { ConstrBlock | SelfInvocation }
def ConstrBlock: Rule0 = rule { '{' ~ SelfInvocation ~ zeroOrMore(SemiS ~ BlockStat) ~ '}' }
def SelfInvocation: Rule0 = rule { "this" ~ oneOrMore(ArgumentExprs()) }
def TopStatSeq: Rule0 = rule { oneOrMore(TopStat).separatedBy(SemiS) }
def TopStat: Rule0 = rule { Packaging | PackageObject(false) | Import(false) | zeroOrMore(Annotation ~ optional(NewlineS)) ~ zeroOrMore(Modifier) ~ TmplDef(false) | MATCH }
def Packaging: Rule0 = rule { "package" ~ QualId ~ optional(NewlineS) ~ '{' ~ TopStatSeq ~ '}' }
def PackageObject(G: B = true): Rule0 = rule { "package" ~ "object" ~ ObjectDef(G) }
def CompilationUnit: Rule0 = rule { zeroOrMore("package" ~ QualId ~ SemiS) ~ TopStatSeq }
}
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