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SspParser.scala
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SspParser.scala
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/**
* Copyright (C) 2009-2011 the original author or authors.
* See the notice.md file distributed with this work for additional
* information regarding copyright ownership.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.fusesource.scalate.ssp
import org.fusesource.scalate.InvalidSyntaxException
import org.fusesource.scalate.support.{ ScalaParseSupport, Text }
import scala.util.parsing.input.{ CharSequenceReader, Positional }
sealed abstract class PageFragment extends Positional {
def tokenName = toString
}
case class CommentFragment(comment: Text) extends PageFragment
case class DollarExpressionFragment(code: Text) extends PageFragment
case class ExpressionFragment(code: Text) extends PageFragment
case class ScriptletFragment(code: Text) extends PageFragment
case class TextFragment(text: Text) extends PageFragment
case class AttributeFragment(
kind: Text,
name: Text,
className: Text,
defaultValue: Option[Text],
autoImport: Boolean) extends PageFragment
abstract class Directive(override val tokenName: String) extends PageFragment
case class IfFragment(code: Text) extends Directive("#if")
case class ElseIfFragment(code: Text) extends Directive("#elseif")
case class ElseFragment() extends Directive("#else")
case class MatchFragment(code: Text) extends Directive("#match")
case class CaseFragment(code: Text) extends Directive("#case")
case class OtherwiseFragment() extends Directive("#otherwise")
case class ForFragment(code: Text) extends Directive("#for")
case class SetFragment(code: Text) extends Directive("#set")
case class DoFragment(code: Text) extends Directive("#do")
case class ImportFragment(code: Text) extends Directive("#import")
case class EndFragment() extends Directive("#end")
/**
* Parser for the SSP template language
*/
class SspParser extends ScalaParseSupport {
var skipWhitespaceOn = false
override def skipWhitespace = skipWhitespaceOn
def skip_whitespace[T](p: => Parser[T]): Parser[T] = Parser[T] {
in =>
skipWhitespaceOn = true
val result = p(in)
skipWhitespaceOn = false
result
}
val anySpace = text("""[ \t]*""".r)
val identifier = text("""[a-zA-Z0-9\$_]+""".r)
val typeName = text(scalaType)
val someText = text(""".+""".r)
val attribute = skip_whitespace(opt(text("import")) ~ text("var" | "val") ~ identifier ~ (":" ~> typeName)) ~ ("""\s*""".r ~> opt("""=\s*""".r ~> upto("""\s*%>""".r))) ^^ {
case (p_import ~ p_kind ~ p_name ~ p_type) ~ p_default => AttributeFragment(p_kind, p_name, p_type, p_default, p_import.isDefined)
}
val literalPart: Parser[Text] =
upto("<%" | """\<%""" | """\\<%""" | "${" | """\${""" | """\\${""" | """\#""" | """\\#""" | directives) ~
opt(
"""\<%""" ~ opt(literalPart) ^^ { case x ~ y => "<%" + y.getOrElse("") } |
"""\${""" ~ opt(literalPart) ^^ { case x ~ y => "${" + y.getOrElse("") } |
"""\#""" ~ opt(literalPart) ^^ { case x ~ y => "#" + y.getOrElse("") } |
"""\\""" ^^ { s => """\""" }) ^^ {
case x ~ Some(y) => x + y
case x ~ None => x
}
val tagEnding = "+%>" | """%>[ \t]*\r?\n""".r | "%>"
val commentFragment = wrapped("<%--", "--%>") ^^ { CommentFragment(_) }
val altCommentFragment = wrapped("<%#", "%>") ^^ { CommentFragment(_) }
val dollarExpressionFragment = wrapped("${", "}") ^^ { DollarExpressionFragment(_) }
val expressionFragment = wrapped("<%=", "%>") ^^ { ExpressionFragment(_) }
val attributeFragement = prefixed("<%@", attribute <~ anySpace ~ tagEnding)
val scriptletFragment = wrapped("<%", tagEnding) ^^ { ScriptletFragment(_) }
val textFragment = literalPart ^^ { TextFragment(_) }
val pageFragment: Parser[PageFragment] = positioned(directives | commentFragment | altCommentFragment | dollarExpressionFragment |
attributeFragement | expressionFragment | scriptletFragment |
textFragment)
val pageFragments = rep(pageFragment)
def directives: Parser[PageFragment] = ifExpression | elseIfExpression | elseExpression |
matchExpression | caseExpression | otherwiseExpression |
forExpression | doExpression | setExpression | velocityScriplet | importExpression | endExpression
// if / elseif / else
def ifExpression = expressionDirective("if") ^^ { IfFragment(_) }
def elseIfExpression = expressionDirective("elseif" | "elif") ^^ { ElseIfFragment(_) }
def elseExpression = emptyDirective("else") ^^ { case a => ElseFragment() }
// match / case / otherwise
def matchExpression = expressionDirective("match") ^^ { MatchFragment(_) }
def caseExpression = expressionDirective("case") ^^ { CaseFragment(_) }
def otherwiseExpression = emptyDirective("otherwise") ^^ { case a => OtherwiseFragment() }
// other directives
def velocityScriplet = wrapped("#{", "}#") ^^ { ScriptletFragment(_) }
def forExpression = expressionDirective("for" ~ opt("each")) ^^ { ForFragment(_) }
def setExpression = expressionDirective("set") ^^ { SetFragment(_) }
def doExpression = expressionDirective("do") ^^ { DoFragment(_) }
def importExpression = expressionDirective("import") ^^ { ImportFragment(_) }
def endExpression = emptyDirective("end") <~ """[ \t]*\r?\n?""".r ^^ { case a => EndFragment() }
// useful for implementing directives
def emptyDirective(name: String) = text(("#" + name) | ("#(" + name + ")"))
def expressionDirective(name: String) = ("#" ~ name ~ anySpace ~ "(") ~> scalaExpression <~ ")"
def expressionDirective[T](p: Parser[T]) = ("#" ~ p ~ anySpace ~ "(") ~> scalaExpression <~ """\)[ \t]*\r?\n?""".r
def scalaExpression: Parser[Text] = {
text(
(rep(nonParenText) ~ opt("(" ~> scalaExpression <~ ")") ~ rep(nonParenText)) ^^ {
case a ~ b ~ c =>
val mid = b match {
case Some(tb) => "(" + tb + ")"
case tb => ""
}
a.mkString("") + mid + c.mkString("")
})
}
val nonParenText = characterLiteral | stringLiteral | """[^\(\)\'\"]+""".r
private def phraseOrFail[T](p: Parser[T], in: String): T = {
val x = phrase(p)(new CharSequenceReader(in))
x match {
case Success(result, _) => result
case NoSuccess(message, next) => throw new InvalidSyntaxException(message, next.pos);
}
}
def getPageFragments(in: String): List[PageFragment] = {
phraseOrFail(pageFragments, in)
}
def getAttribute(in: String): AttributeFragment = {
phraseOrFail(attribute, in)
}
}