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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.node.admin.task.util.template;
import com.yahoo.vespa.hosted.node.admin.task.util.text.Cursor;
import com.yahoo.vespa.hosted.node.admin.task.util.text.CursorRange;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.function.Consumer;
/**
* The Java representation of a template text.
*
* <p>A template is a sequence of literal text and dynamic sections defined by %{...} directives:</p>
*
* <pre>
* template: section*
* section: literal | variable | list
* literal: # plain text not containing %{
* variable: %{=identifier}
* list: %{list identifier}template%{end}
* identifier: # a valid Java identifier
* </pre>
*
* <p>Any newline (\n) following a non-variable directive is removed.</p>
*
* <p><b>Instantiate</b> the template to get a form ({@link #instantiate()}), fill it
* (e.g. {@link Form#set(String, String) Form.set()}), and render the String ({@link Form#render()}).</p>
*
* @see Form
* @see TemplateParser
* @see TemplateFile
* @author hakonhall
*/
public class Template {
private final Cursor start;
private final Cursor end;
private final List<Consumer<FormBuilder>> sections = new ArrayList<>();
private final HashSet<String> names = new HashSet<>();
Template(Cursor start) {
this.start = new Cursor(start);
this.end = new Cursor(start);
}
public Form instantiate() {
return FormBuilder.build(range(), sections);
}
void appendLiteralSection(Cursor end) {
CursorRange range = verifyAndUpdateEnd(end);
sections.add((FormBuilder builder) -> builder.addLiteralSection(range));
}
void appendVariableSection(String name, Cursor nameOffset, Cursor end) {
CursorRange range = verifyAndUpdateEnd(end);
verifyAndAddNewName(name, nameOffset);
sections.add(formBuilder -> formBuilder.addVariableSection(range, name, nameOffset));
}
void appendListSection(String name, Cursor nameCursor, Cursor end, Template body) {
CursorRange range = verifyAndUpdateEnd(end);
verifyAndAddNewName(name, nameCursor);
sections.add(formBuilder -> formBuilder.addListSection(range, name, body));
}
private CursorRange range() { return new CursorRange(start, end); }
private CursorRange verifyAndUpdateEnd(Cursor newEnd) {
var range = new CursorRange(this.end, newEnd);
this.end.set(newEnd);
return range;
}
private String verifyAndAddNewName(String name, Cursor nameOffset) {
if (!names.add(name)) {
throw new IllegalArgumentException("'" + name + "' at " +
nameOffset.calculateLocation().lineAndColumnText() +
" has already been defined");
}
return name;
}
}
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