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authorlihaoyi <haoyi.sg@gmail.com>2014-11-24 02:48:13 -0800
committerlihaoyi <haoyi.sg@gmail.com>2014-11-24 02:48:13 -0800
commit6829fb683e1e0ab3a14272a756af63a1a40ebfd7 (patch)
treeb716835039cf23356d083fb4a97ca4475afe1a90 /scalaParser/src/main/scala/scalaParser/ScalaSyntax.scala
parentc6e266f8d0f8d8ce948ddf6b8539e28606e9b009 (diff)
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diff --git a/scalaParser/src/main/scala/scalaParser/ScalaSyntax.scala b/scalaParser/src/main/scala/scalaParser/ScalaSyntax.scala
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+package scalaParser
+import acyclic.file
+import language.implicitConversions
+import syntax._
+import org.parboiled2._
+
+/**
+ * Parser for Scala syntax.
+ *
+ * The `G` parameter that gets passed in to each rule stands for
+ * "Greedy", and determines whether or not that rule is to consume
+ * newlines after the last terminal in that rule. We need to pass it
+ * everywhere so it can go all the way to the last terminal deep
+ * inside the parse tree, which can then decide whether or not to
+ * consume whitespace.
+ *
+ * The vast majority of terminals will consume newlines; only rules
+ * which occur in {} blocks won't have their terminals consume newlines,
+ * and only the *last* terminal in the rule will be affected.
+ * That's why the parser does terminals-consume-newlines-by-default,
+ * and leaves it up to the dev to thread the `G` variable where-ever
+ * we want the opposite behavior.
+ */
+class ScalaSyntax(val input: ParserInput) extends Parser with Basic with Identifiers with Literals {
+ // Aliases for common things. These things are used in almost every parser
+ // in the file, so it makes sense to keep them short.
+ type B = Boolean
+ val t = true
+ type R0 = Rule0
+ /**
+ * Parses all whitespace, excluding newlines. This is only
+ * really useful in e.g. {} blocks, where we want to avoid
+ * capturing newlines so semicolon-inference would work
+ */
+ def WS = rule { zeroOrMore(Basic.WhitespaceChar | Literals.Comment) }
+
+ /**
+ * Parses whitespace, including newlines.
+ * This is the default for most things
+ */
+ def WL = rule{ zeroOrMore(Basic.WhitespaceChar | Literals.Comment | Basic.Newline) }
+
+
+ /**
+ * Whitespace which captures or doesn't-capture
+ * newlines depending on the G that gets passed in
+ */
+ def W(G: B = t) =
+ if (G) WL
+ else WS
+
+ /**
+ * By default, all strings and characters greedily
+ * capture all whitespace immediately after the token.
+ */
+ implicit private[this] def wspStr(s: String): R0 = rule { str(s) ~ WL }
+ implicit private[this] def wspChar(s: Char): R0 = rule { ch(s) ~ WL }
+
+ /**
+ * Most keywords don't just require the correct characters to match,
+ * they have to ensure that subsequent characters *don't* match in
+ * order for it to be a keyword. This enforces that rule for key-words
+ * (W) and key-operators (O) which have different non-match criteria.
+ */
+ object K {
+ def W(s: String) = rule {
+ Key.W(s) ~ WL
+ }
+
+ def O(s: String) = rule {
+ Key.O(s) ~ WL
+ }
+ }
+
+ /**
+ * Occasionally, you want to decide whether or not to
+ * capture newlines based on the context, so use this
+ * and pass in G manually.
+ */
+ def StrW(s: String, G: B): R0 = rule { str(s) ~ W(G) }
+
+ def pos = cursor -> cursorChar
+
+ /**
+ * helper printing function
+ */
+ def pr(s: String) = rule { run(println(s"LOGGING $cursor: $s")) }
+
+ def Id(G: B = t) = rule { Identifiers.Id ~ W(G) }
+ def VarId(G: B = t) = rule { Identifiers.VarId ~ W(G) }
+ def Literal(G: B = t) = rule { Literals.Literal ~ W(G) }
+ def Semi = rule { Basic.Semi ~ WL }
+ def Newline = rule { Basic.Newline ~ WL }
+
+ def QualId(G: B = t) = rule { oneOrMore(Id(false)) separatedBy '.' ~ W(G) }
+ def Ids = rule { oneOrMore(Id()) separatedBy ',' }
+
+ def Path(G: B = t): R0 = rule {
+ zeroOrMore(Id(G) ~ '.') ~ K.W("this") ~ zeroOrMore(Id(G)).separatedBy('.') |
+ StableId(G)
+ }
+ def StableId(G: B = t): R0 = rule {
+ zeroOrMore(Id() ~ '.') ~ (K.W("this") | K.W("super") ~ optional(ClassQualifier)) ~ '.' ~ oneOrMore(Id(G)).separatedBy('.') |
+ Id(false) ~ zeroOrMore(WL ~ '.' ~ WL ~ Id(false)) ~ W(G)
+ }
+
+ def ClassQualifier = rule { '[' ~ Id() ~ ']' }
+
+ def Type(G: B = t): R0 = rule {
+ FunctionArgTypes ~ K.O("=>") ~ Type(G) | InfixType(false) ~ optional(WL ~ ExistentialClause) ~ W(G)
+ }
+ def FunctionArgTypes = rule {
+ InfixType() | '(' ~ optional(oneOrMore(ParamType) separatedBy ',') ~ ')'
+ }
+
+ def ExistentialClause = rule { "forSome" ~ '{' ~ oneOrMore(ExistentialDcl(false)).separatedBy(Semi) }
+ def ExistentialDcl(G: B = t) = rule { K.W("type") ~ TypeDcl(G) | K.W("val") ~ ValDcl(G) }
+
+ def InfixType(G: B = t) = rule {
+ CompoundType(false) ~ zeroOrMore(WL ~ Id() ~ optional(Newline) ~ CompoundType(false)) ~ W(G)
+ }
+ def CompoundType(G: B = t) = rule {
+ oneOrMore(AnnotType(false)).separatedBy(WL ~ K.W("with")) ~ optional(Refinement(false)) ~ W(G)
+ }
+ def AnnotType(G: B = t) = rule {
+ SimpleType(false) ~ zeroOrMore(WL ~ Annotation(false)) ~ W(G)
+ }
+ def SimpleType(G: B = t): R0 = rule {
+ BasicType(false) ~
+ optional(WL ~ '#' ~ Id(false)) ~
+ optional(WL ~ TypeArgs(false)) ~
+ W(G)
+ }
+ def BasicType(G: B = t): R0 = rule {
+ '(' ~ Types ~ ')' |
+ Path() ~ '.' ~ K.W("type") |
+ StableId(G)
+ }
+ def TypeArgs(G: B = t) = rule { '[' ~ Types ~ StrW("]", G) }
+ def Types = rule { oneOrMore(Type()).separatedBy(',') }
+ def Refinement(G: B = t) = rule {
+ optional(Newline) ~ '{' ~ oneOrMore(RefineStat).separatedBy(Semi) ~ StrW("}", G)
+ }
+ def RefineStat = rule { "type" ~ TypeDef(false) | Dcl(false) | MATCH }
+ def TypePat = rule { CompoundType() }
+ def Ascription(G: B = t) = rule {
+ ":" ~ ("_" ~ StrW("*", G) | InfixType(G) | oneOrMore(Annotation(G)))
+ }
+
+ def ParamType = rule { K.O("=>") ~ Type() | Type() ~ "*" | Type() }
+
+ def Expr(G: B = t): R0 = rule { (Bindings | optional(K.W("implicit")) ~ Id() | "_") ~ K.O("=>") ~ Expr(G) | Expr1(G) }
+ def Expr1(G: B = t): R0 = rule {
+ IfCFlow(G) |
+ WhileCFlow(G) |
+ TryCFlow(G) |
+ DoWhileCFlow(G) |
+ ForCFlow(G) |
+ K.W("throw") ~ Expr(G) |
+ K.W("return") ~ optional(Expr(G)) |
+ SimpleExpr() ~ K.O("=") ~ Expr(G) |
+ PostfixExpr(false) ~ optional("match" ~ '{' ~ CaseClauses ~ StrW("}", false) | Ascription(false)) ~ W(G)
+ }
+ def IfCFlow(G: B = t) = rule { "if" ~ '(' ~ Expr() ~ ')' ~ zeroOrMore(Newline) ~ Expr(G) ~ optional(optional(Semi) ~ K.W("else") ~ Expr(G)) }
+ def WhileCFlow(G: B = t) = rule { "while" ~ '(' ~ Expr() ~ ')' ~ zeroOrMore(Newline) ~ Expr(G) }
+ def TryCFlow(G: B = t) = rule {
+ K.W("try") ~ Expr(false) ~
+ optional(WL ~ K.W("catch") ~ Expr(false)) ~
+ optional(WL ~ K.W("finally") ~ Expr(false)) ~
+ W(G)
+ }
+
+ def DoWhileCFlow(G: B = t) = rule { K.W("do") ~ Expr() ~ optional(Semi) ~ "while" ~ '(' ~ Expr() ~ StrW(")", G) }
+ def ForCFlow(G: B = t) = rule {
+ "for" ~
+ ('(' ~ Enumerators ~ ')' | '{' ~ Enumerators ~ '}') ~
+ zeroOrMore(Newline) ~
+ optional(K.W("yield")) ~
+ Expr(G) }
+ def PostfixExpr(G: B = t): R0 = rule { InfixExpr(G) ~ optional(Id() ~ optional(Newline)) }
+ def InfixExpr(G: B = t): R0 = rule { PrefixExpr(G) ~ zeroOrMore(Id() ~ optional(Newline) ~ PrefixExpr(G)) }
+ def PrefixExpr(G: B = t) = rule { optional(anyOf("-+~!")) ~ SimpleExpr(G) }
+
+ def SimpleExpr(G: B = t): R0 = rule {
+ SimpleExpr1(false) ~
+ zeroOrMore(WL ~ ('.' ~ Id(false) | TypeArgs(false) | ArgumentExprs(false))) ~
+ optional(WL ~ StrW("_", false)) ~
+ W(G)
+ }
+
+ def SimpleExpr1(G: B = t) = rule{
+ K.W("new") ~ (ClassTemplate(G) | TemplateBody(G)) |
+ BlockExpr(G) |
+ Literal(G) ~ drop[String] |
+ Path(G) |
+ K.W("_") |
+ '(' ~ optional(Exprs) ~ StrW(")", G)
+ }
+
+
+
+ def Exprs: R0 = rule { oneOrMore(Expr()).separatedBy(',') }
+ def ArgumentExprs(G: B = t): R0 = rule {
+ '(' ~ optional(Exprs ~ optional(K.O(":") ~ K.W("_") ~ '*')) ~ StrW(")", G) |
+ optional(Newline) ~ BlockExpr(G)
+ }
+
+ def BlockExpr(G: B = t): R0 = rule { '{' ~ (CaseClauses | Block) ~ StrW("}", G) }
+ def Block: R0 = rule {
+ zeroOrMore(BlockStat ~ Semi) ~ optional(ResultExpr())
+ }
+
+ def BlockStat: R0 = rule {
+ Semi |
+ Import(false) |
+ zeroOrMore(Annotation(false)) ~ (optional(K.W("implicit") | K.W("lazy")) ~ Def(false) | zeroOrMore(LocalModifier) ~ TmplDef(false)) |
+ Expr1(false)
+ }
+ def ResultExpr(G: B = t): R0 = rule { (Bindings | optional(K.W("implicit")) ~ Id() | "_") ~ K.W("=>") ~ Block | Expr1(t) }
+ def Enumerators: R0 = rule { Generator(false) ~ zeroOrMore(Semi ~ Enumerator(false)) ~ WL }
+ def Enumerator(G: B = t): R0 = rule { Generator(G) | Guard(G) | Pattern1 ~ K.O("=") ~ Expr(G) }
+ def Generator(G: B = t): R0 = rule { Pattern1 ~ K.O("<-") ~ Expr(false) ~ optional(WL ~ Guard(false)) ~ W(G) }
+ def CaseClauses: R0 = rule { oneOrMore(CaseClause) }
+ def CaseClause: R0 = rule { K.W("case") ~ Pattern ~ optional(Guard(true)) ~ K.O("=>") ~ Block }
+ def Guard(G: B = t): R0 = rule { K.W("if") ~ PostfixExpr(G) }
+ def Pattern: R0 = rule {
+ oneOrMore(Pattern1).separatedBy('|')
+ }
+ def Pattern1: R0 = rule {
+ K.W("_") ~ K.O(":") ~ TypePat | VarId() ~ K.O(":") ~ TypePat | Pattern2
+ }
+ def Pattern2: R0 = rule {
+ VarId() ~ "@" ~ Pattern3 | Pattern3 | VarId()
+ }
+ def Pattern3: R0 = rule {
+ SimplePattern ~ zeroOrMore(Id() ~ SimplePattern)
+ }
+ def SimplePattern: R0 = rule {
+ K.W("_") |
+ Literal() ~ drop[String] |
+ '(' ~ optional(Patterns) ~ ')' |
+ (
+ StableId() ~
+ optional(
+ '(' ~
+ (optional(Patterns ~ ',') ~ optional(VarId() ~ '@') ~ K.W("_") ~ '*' | optional(Patterns)) ~
+ ')'
+ )
+ ) |
+ VarId()
+ }
+ def Patterns: R0 = rule { K.W("_") ~ '*' | oneOrMore(Pattern).separatedBy(',') }
+
+ def TypeParamClause: R0 = rule { '[' ~ oneOrMore(VariantTypeParam).separatedBy(',') ~ ']' }
+ def FunTypeParamClause: R0 = rule { '[' ~ oneOrMore(TypeParam).separatedBy(',') ~ ']' }
+ def VariantTypeParam: R0 = rule { zeroOrMore(Annotation()) ~ optional(anyOf("+-")) ~ TypeParam }
+ def TypeParam: R0 = rule {
+ (Id() | K.W("_")) ~
+ optional(TypeParamClause) ~
+ optional(K.O(">:") ~ Type()) ~
+ optional(K.O("<:") ~ Type()) ~
+ zeroOrMore(K.O("<%") ~ Type()) ~
+ zeroOrMore(K.O(":") ~ Type())
+ }
+ def ParamClauses: R0 = rule { zeroOrMore(ParamClause) ~ optional(optional(Newline) ~ '(' ~ K.W("implicit") ~ Params ~ ')') }
+ def ParamClause: R0 = rule { optional(Newline) ~ '(' ~ optional(Params) ~ ')' }
+ def Params: R0 = rule { zeroOrMore(Param).separatedBy(',') }
+ def Param: R0 = rule { zeroOrMore(Annotation()) ~ Id() ~ optional(K.O(":") ~ ParamType) ~ optional(K.O("=") ~ Expr()) }
+ def ClassParamClauses(G: B = t): R0 = rule { zeroOrMore(ClassParamClause(G)) ~ optional(optional(Newline) ~ '(' ~ K.W("implicit") ~ ClassParam ~ StrW(")", G)) }
+ def ClassParamClause(G: B = t): R0 = rule { optional(Newline) ~ '(' ~ optional(ClassParams) ~ StrW(")", G) }
+ def ClassParams: R0 = rule { oneOrMore(ClassParam).separatedBy(',') }
+ def ClassParam: R0 = rule { zeroOrMore(Annotation()) ~ optional(zeroOrMore(Modifier) ~ (K.W("val") | K.W("var"))) ~ Id() ~ K.O(":") ~ ParamType ~ optional(K.O("=") ~ Expr()) }
+
+ def Bindings: R0 = rule { '(' ~ oneOrMore(Binding).separatedBy(',') ~ ')' }
+ def Binding: R0 = rule { (Id() | K.W("_")) ~ optional(K.O(":") ~ Type()) }
+
+ def Modifier: R0 = rule { LocalModifier | AccessModifier | K.W("override") }
+ def LocalModifier: R0 = rule { K.W("abstract") | K.W("final") | K.W("sealed") | K.W("implicit") | K.W("lazy") }
+ def AccessModifier: R0 = rule { (K.W("private") | K.W("protected")) ~ optional(AccessQualifier) }
+ def AccessQualifier: R0 = rule { '[' ~ (K.W("this") | Id()) ~ ']' }
+
+ def Annotation(G: B = t): R0 = rule { '@' ~ SimpleType(false) ~ zeroOrMore(WL ~ ArgumentExprs(false)) ~ W(G) }
+ def ConstrAnnotation: R0 = rule { '@' ~ SimpleType() ~ ArgumentExprs() }
+
+ def TemplateBody(G: B = t): R0 = rule {
+ WL ~
+ '{' ~
+ optional(SelfType) ~
+ TemplateStat ~
+ zeroOrMore(Semi ~ TemplateStat) ~
+ WL ~
+ StrW("}", G)
+ }
+ def TemplateStat: R0 = rule {
+ Import(false) |
+ zeroOrMore(Annotation() ~ optional(Newline)) ~ zeroOrMore(Modifier) ~ (Def(false) | Dcl(false)) |
+ Expr(false) |
+ MATCH
+ }
+
+ def SelfType: R0 = rule { K.W("this") ~ K.O(":") ~ Type() ~ K.O("=>") | Id() ~ optional(K.O(":") ~ Type()) ~ K.O("=>") }
+
+ def Import(G: B = t): R0 = rule { K.W("import") ~ oneOrMore(ImportExpr(G)).separatedBy(',') }
+
+ def ImportExpr(G: B = t): R0 = rule { StableId(G) ~ optional('.' ~ (StrW("_", G) | ImportSelectors(G))) }
+ def ImportSelectors(G: B = t): R0 = rule { '{' ~ zeroOrMore(ImportSelector ~ ',') ~ (ImportSelector | K.W("_")) ~ StrW("}", G) }
+ def ImportSelector: R0 = rule { Id() ~ optional(K.O("=>") ~ (Id() | K.W("_"))) }
+
+ def Dcl(G: B = t): R0 = rule {
+ K.W("val") ~ ValDcl(G) |
+ K.W("var") ~ VarDcl(G) |
+ K.W("def") ~ FunDcl(G) |
+ K.W("type") ~ zeroOrMore(Newline) ~ TypeDcl(G)
+ }
+ def ValDcl(G: B = t): R0 = rule { Ids ~ K.O(":") ~ Type(G) }
+ def VarDcl(G: B = t): R0 = rule { Ids ~ K.O(":") ~ Type(G) }
+ def FunDcl(G: B = t): R0 = rule { FunSig(false) ~ optional(WL ~ K.O(":") ~ Type(G)) }
+ def FunSig(G: B = t): R0 = rule { Id() ~ optional(FunTypeParamClause) ~ ParamClauses }
+ def TypeDcl(G: B = t): R0 = rule {
+ Id(false) ~
+ optional(WL ~ TypeParamClause) ~
+ optional(WL ~ K.O(">:") ~ Type(false)) ~
+ optional(WL ~ K.O("<:") ~ Type(false)) ~
+ W(G)
+ }
+
+ def PatVarDef(G: B = t): R0 = rule { K.W("val") ~ PatDef(G) | K.W("var") ~ VarDef(G) }
+ def Def(G: B = t): R0 = rule { K.W("def") ~ FunDef(G) | K.W("type") ~ zeroOrMore(Newline) ~ TypeDef(G) | PatVarDef(G) | TmplDef(G) }
+ def PatDef(G: B = t): R0 = rule { oneOrMore(Pattern2).separatedBy(',') ~ optional(K.O(":") ~ Type()) ~ K.O("=") ~ Expr(G) }
+ def VarDef(G: B = t): R0 = rule { Ids ~ K.O(":") ~ Type() ~ K.O("=") ~ K.W("_") | PatDef(G) }
+ def FunDef(G: B = t): R0 = rule {
+ K.W("this") ~ ParamClause ~ ParamClauses ~ (K.O("=") ~ ConstrExpr | optional(Newline) ~ ConstrBlock) |
+ FunSig() ~
+ (
+ optional(K.O(":") ~ Type()) ~ K.O("=") ~ optional(K.W("macro")) ~ Expr(G) |
+ optional(Newline) ~ '{' ~ Block ~ StrW("}", G)
+ )
+ }
+ def TypeDef(G: B = t): R0 = rule { Id() ~ optional(TypeParamClause) ~ K.O("=") ~ Type(G) }
+
+ def TmplDef(G: B = t): R0 = rule {
+ K.W("trait") ~ TraitDef(G) |
+ optional(K.W("case")) ~ (K.W("class") ~ ClassDef(G) |
+ K.W("object") ~ ObjectDef(G))
+ }
+ def ClassDef(G: B = t): R0 = rule {
+ Id() ~
+ optional(TypeParamClause) ~
+ zeroOrMore(ConstrAnnotation) ~
+ optional(AccessModifier) ~
+ ClassParamClauses(false) ~
+ ClassTemplateOpt(false) ~
+ W(G)
+
+ }
+ def TraitDef(G: B = t): R0 = rule { Id() ~ optional(TypeParamClause) ~ TraitTemplateOpt(G) }
+ def ObjectDef(G: B = t): R0 = rule { Id() ~ ClassTemplateOpt(G) }
+ def ClassTemplateOpt(G: B = t): R0 = rule {
+ WL ~ K.W("extends") ~ ClassTemplate(G) |
+ optional(WL ~ optional(K.W("extends")) ~ TemplateBody(G))
+ }
+ def TraitTemplateOpt(G: B = t): R0 = rule { K.W("extends") ~ TraitTemplate(G) | optional(optional(K.W("extends")) ~ TemplateBody(G)) }
+ def ClassTemplate(G: B = t): R0 = rule {
+ optional(EarlyDefs) ~
+ ClassParents(false) ~
+ optional(WL ~ TemplateBody(false)) ~
+ W(G)
+ }
+
+ def TraitTemplate(G: B = t): R0 = rule {
+ optional(EarlyDefs) ~ TraitParents(false) ~ optional(TemplateBody(false)) ~ W(G)
+ }
+ def ClassParents(G: B = t): R0 = rule {
+ Constr(false) ~ zeroOrMore(WL ~ K.W("with") ~ AnnotType(G)) ~ W(G)
+ }
+ def TraitParents(G: B = t): R0 = rule {
+ AnnotType(false) ~ zeroOrMore(WL ~ K.W("with") ~ AnnotType(false)) ~ W(G)
+ }
+ def Constr(G: B = t): R0 = rule {
+ AnnotType(false) ~ zeroOrMore(WL ~ ArgumentExprs(false)) ~
+ W(G)
+ }
+ def EarlyDefs: R0 = rule {
+ '{' ~ optional(oneOrMore(EarlyDef).separatedBy(Semi)) ~ '}' ~ K.W("with")
+ }
+ def EarlyDef: R0 = rule {
+ zeroOrMore(Annotation() ~ optional(Newline)) ~ zeroOrMore(Modifier) ~ PatVarDef(false)
+ }
+ def ConstrExpr: R0 = rule { ConstrBlock | SelfInvocation }
+ def ConstrBlock: R0 = rule { '{' ~ SelfInvocation ~ zeroOrMore(Semi ~ BlockStat) ~ '}' }
+ def SelfInvocation: R0 = rule { K.W("this") ~ oneOrMore(ArgumentExprs()) }
+
+ def TopStatSeq: R0 = rule { zeroOrMore(TopStat).separatedBy(Semi) }
+ def TopStat: R0 = rule {
+ Packaging |
+ PackageObject(false) |
+ Import(false) |
+ zeroOrMore(Annotation(false) ~ optional(Newline)) ~ zeroOrMore(Modifier) ~ TmplDef(false) |
+ MATCH
+ }
+ def Packaging: R0 = rule { K.W("package") ~ QualId() ~ '{' ~ TopStatSeq ~ '}' }
+ def PackageObject(G: B = t): R0 = rule { K.W("package") ~ K.W("object") ~ ObjectDef(G) }
+ def CompilationUnit: Rule1[String] = rule {
+ capture(
+ WL ~
+ zeroOrMore(Semi) ~
+ zeroOrMore(K.W("package") ~ QualId(false)).separatedBy(Semi) ~
+ TopStatSeq ~
+ EOI
+ )
+ }
+}