xerial.core.util.StringTemplate.scala Maven / Gradle / Ivy
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/*
* Copyright 2012 Taro L. Saito
*
* 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 xerial.core.util
//--------------------------------------
//
// StringTemplate.scala
// Since: 2012/01/16 9:33
//
//--------------------------------------
object StringTemplate {
def eval(template: String)(properties: Map[Any, String]) = new StringTemplate(template).eval(properties)
}
/**
* @author leo
*/
class StringTemplate(template: String) {
def eval(property: Map[Any, String]): String = apply(property)
private def convert(properties: Map[Any, String]): Map[Symbol, String] = {
(for ((k, v) <- properties) yield {
k match {
case s: Symbol => s -> v.toString
case _ => Symbol(k.toString) -> v.toString
}
}).toMap
}
def apply(property: Map[Any, String]): String = {
val p = convert(property)
val pattern = """(^\$|[^\\]\$)[^\$]+\$""".r
val out = new StringBuilder
for ((line, lineCount) <- template.lines.zipWithIndex) {
if (lineCount > 0)
out.append("\n")
var cursor = 0
for (m <- pattern.findAllIn(line).matchData) {
val prefixSize = m.group(1).length() - 1
val varStart = m.start + prefixSize
val varEnd = m.end
val key = line.substring(varStart + 1, varEnd - 1)
if (cursor < varStart) {
out.append(line.substring(cursor, varStart))
cursor = varEnd
}
val k = Symbol(key)
if (p.contains(k)) {
out.append(p(k))
}
cursor = varEnd;
}
if (cursor < line.length)
out.append(line.substring(cursor, line.length))
}
out.toString
}
}