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TemplateLang.sdf3

pdmosses/sdf/org.metaborg.meta.lang.template/syntax/TemplateLang.sdf3

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module  
imports
  sdf2-core/Sdf2
  constants/StrCon
  sorts/Sorts
  symbols/Symbols
  labels/Labels
  constants/IdentifierCon
  kernel/Kernel
  restrictions/Restrictions
  priority/Priority
  basic/Basic
  modules/Modules
  layout-constraints/Layout-Constraints

context-free start-symbols
    Module

context-free syntax
//options section
Section.TemplateOptions = <
        template options 

                <{TemplateOption "\n"}*>

        > 

TemplateOption.Newlines = <newlines : <NewlineOptionValue>>

TemplateOption.KeywordAttributes = <<SymbolDef> = keyword <Attributes>>

NewlineOptionValue.None = <none>
NewlineOptionValue.Leading = <leading>
NewlineOptionValue.Trailing = <trailing>
NewlineOptionValue.Separating = <separating>

TemplateOption.KeywordFollowRestriction = <keyword -/- <Lookaheads>>

TemplateOption.Tokenize = <tokenize : <StrCon>>

context-free syntax
//references to productions using sort.cons notation in priority specification
Group.SimpleRefGroup = <<SortConsRef>>
Group.ProdsRefGroup = <{<{SortConsRef "\n"}+>}>
Group.AssocRefGroup = <
        {<Associativity> :
                <{SortConsRef "\n"}+>}>
.SortConsRef = <<Symbol>.<Constructor>>

context-free syntax 
//grammars
Section.TemplateSection = <
        templates 

                <{TemplateProduction "\n"}*>

        > {deprecated("Use context-free syntax section instead")}

Grammar.LexicalSyntax = <
        lexical syntax 

                <{SdfProduction "\n"}*>

        > {prefer}

Grammar.ContextFreeSyntax = <
        context-free syntax 

                <{GeneralProduction "\n"}*>

        > {prefer}

Grammar.Kernel = <
        syntax 

                <{SdfProduction "\n"}*>

        > {prefer}

GeneralProduction = <<SdfProduction>>
GeneralProduction = <<TemplateProduction>> {prefer}


// syntactic sugar for SDF
.SdfProduction = <<SymbolDef> = <RHS> <Attributes>> 
.SdfProductionWithCons = <<SortCons> = <RHS> <Attributes>>
.Rhs = <<Symbols>>

// template productions
.TemplateProduction = <<SymbolDef> = <Template> <Attributes>>

// template productions Sort.Cons = ...
.TemplateProductionWithCons = <<SortCons> = <Template> <Attributes>>

.Constructor = <<IdCon>>

.SortCons = <<SymbolDef>.<Constructor>>


// placeholders
TemplatePart1.Angled       = [<[Placeholder]>]
TemplatePart1.BreakAngled  = [<>]
TemplatePart2.Squared      = <[<Placeholder>]>
TemplatePart2.BreakSquared = <[]>

.Placeholder = <<Symbol><PlaceholderOptions>>



PlaceholderOptions.NoOptions = <>
PlaceholderOptions.Options = <;<{PlaceholderOption ", "}+>>

PlaceholderOption.Hide = <hide>
PlaceholderOption.Wrap = <wrap>
PlaceholderOption.Anchor = <anchor>
PlaceholderOption.Floating = <float>
PlaceholderOption.CompCursor = <cursor>
//mark as deprecated
PlaceholderOption.Separator = <separator=<StrCon>> {deprecated("Use list with separator symbol instead: {S \"separator\"}*")}
PlaceholderOption.Text = <text=<StrCon>>

  syntax


  -CF.Template = "<" {TemplateLine1-CF "\n"}+ ">"
  -CF.TemplateDeprecated =  "<<" {TemplateLine1-CF "\n"}+ ">>" {avoid, deprecated("Use single brackets to delimit the template")}
  -CF.Line = TemplatePart1-CF* 
  TemplatePart1-CF.String = TemplateString1-LEX
  TemplatePart1-CF.Escape = TemplateEscape1-LEX
  TemplatePart1-CF.Layout = TemplateLayout-LEX 

  -CF.TemplateSquare = "[" {TemplateLine2-CF "\n"}+ "]"
  -CF.TemplateSquareDeprecated = "[[" {TemplateLine2-CF "\n"}+ "]]" {avoid, deprecated("Use single brackets to delimit the template")}
  -CF.Line = TemplatePart2-CF* 

  TemplatePart2-CF.String =  TemplateString2-LEX 

  TemplatePart2-CF.Escape = TemplateEscape2-LEX
  TemplatePart2-CF.Layout = TemplateLayout-LEX


  lexical syntax

           = LF
           = CR
           = CR LF

           = [\r]
           = [\n]

    "\n" = EOL

  lexical restrictions

    EOL -/- [\n]


  lexical syntax

     =  [\ \t]+

     = TemplateString1Alt+
     = TemplateString2Alt+
        TemplateStringQ =  ~[\\\"\ \t]+   
    TemplateString1Alt = ~[\\\<\>\ \t\r\n]
    TemplateString2Alt = ~[\\\[\]\ \t\r\n] 
    TemplateString2Alt = Backslash

         = [\\] 
    // [\\] -> Backslash1
    // [\\] -> Backslash2      => [\\] -> Backslash

  lexical restrictions
    TemplateLayout -/- [\ \t]

    %% must be followed by:
    TemplateString1 -/- ~[\\\<\>\ \t\r\n]
    TemplateString2 -/- ~[\\\[\]\ \t\r\n]
    TemplateStringQ -/- ~[\\\"\ \t]

    %% if followed by a backslash, then the backslash must be followed by:
    TemplateString1 -/- [\\].~[\<\>\\]
    TemplateString2 -/- [\\].~[\[\]\\]

    Backslash -/- [\<\>\\]

  template options

          tokenize : "="  

  lexical syntax
  //production for ContenteCompletion
  CONTENTCOMPLETE = [a-zA-Z]* "CONTENTCOMPLETE" [0-9]+  {avoid}

  //combine sequences of escaped chars
   = EscapedChar1+
   = EscapedChar2+

  //this are the escapes which StringTemplate has
  EscapedChar1 = "\\<"
  EscapedChar1 = "\\>"
  EscapedChar1 = "\\\\"
  EscapedChar2 = "\\["
  EscapedChar2 = "\\]"
  EscapedChar2 = "\\\\"

   //EscapedChar1 = "<" (EscapedBackslashChar1 | EscapedChar)* ">"
   EscapedChar1 = "<" EscapedChar1Alt+ ">"
   EscapedChar1Alt = EscapedBackslashChar1
   EscapedChar1Alt = EscapedChar

   EscapedChar1 = "<\\\\>" [\ \t\r]* [\n]

   //EscapedChar2 = "[" (EscapedBackslashChar2 | EscapedChar)* "]"
   EscapedChar2 = "[" EscapedChar2Alt+ "]"
   EscapedChar2Alt = EscapedBackslashChar2 
   EscapedChar2Alt = EscapedChar
   EscapedChar2 = "[\\\\]" [\ \t\r]* [\n]

    // double-backslash isn't allowed as sole member of escape placeholder
    // (would clash with <\\> / [\\] line continuation construct)
    // so we add follow restrictions to the following symbols:
    = "\\\\"
    = "\\\\"

   TemplateEscapeQ = TemplateEscapeQAlt+
   TemplateEscapeQAlt = EscapedChar
   TemplateEscapeQAlt = "\\\\"

   //escapes allowed in a placeholder-like construct
    = "\\'"
    = '\\"'
    =  "\\ "
    =  "\\t"
    =  "\\r"
    =  "\\n"



     = "\\u" [0-9A-Fa-f]+ 
     = EscapedUnicodeChar

    .WATER = "\\" ~[] {recover}
    EscapedChar1.WATER = "<" ~[\>]+ ">" {recover}
    EscapedChar2.WATER = "[" ~[\]]+ "]" {recover}


  lexical restrictions
    TemplateEscape1 -/- [\\]
    TemplateEscape1 -/- [\<].[\\\>]
    TemplateEscape2 -/- [\\]
    TemplateEscape2 -/- [\[].[\\\]]
    TemplateEscapeQ -/- [\\]
    EscapedBackslashChar1 -/- [\>]
    EscapedBackslashChar2 -/- [\]]
    EscapedUnicodeChar -/- [0-9A-Fa-f]