Michael Bayne
709 lines
28 KiB
Java
709 lines
28 KiB
Java
//
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// JMustache - A Java implementation of the Mustache templating language
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// http://github.com/samskivert/jmustache/blob/master/LICENSE
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package com.samskivert.mustache;
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import java.io.IOException;
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import java.io.Reader;
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import java.io.StringReader;
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import java.io.Writer;
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import java.util.ArrayList;
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import java.util.Iterator;
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import java.util.List;
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import java.util.Map;
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/**
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* Provides <a href="http://mustache.github.com/">Mustache</a> templating services.
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*
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* <p> Basic usage:
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* <pre>{@code
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* String source = "Hello {{arg}}!";
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* Template tmpl = Mustache.compiler().compile(source);
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* Map<String, Object> context = new HashMap<String, Object>();
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* context.put("arg", "world");
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* tmpl.execute(context); // returns "Hello world!"
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* }</pre>
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*/
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public class Mustache
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{
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/** An interface to the Mustache compilation process. See {@link Mustache}. */
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public static class Compiler
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{
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/** Whether or not HTML entities are escaped by default. */
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public final boolean escapeHTML;
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/** Whether or not standards mode is enabled. */
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public final boolean standardsMode;
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/** A value to use when a variable resolves to null. If this value is null (which is the
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* default null value), an exception will be thrown. If {@link #missingIsNull} is also
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* true, this value will be used when a variable cannot be resolved.
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*
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* <p>If the nullValue contains a substring {@code {{name}}}, then this substring will be
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* replaced by name of the variable. For example, if nullValue is {@code ?{{name}}?} and
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* the missing variable is {@code foo}, then string {@code ?foo?} will be used.</p> */
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public final String nullValue;
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/** If this value is true, missing variables will be treated like variables that return
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* null. {@link #nullValue} will be used in their place, assuming {@link #nullValue} is
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* configured to a non-null value. */
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public final boolean missingIsNull;
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/** If this value is true, empty string will be treated as a false value, as in JavaScript
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* mustache implementation. Default is false. */
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public final boolean emptyStringIsFalse;
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/** The template loader in use during this compilation. */
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public final TemplateLoader loader;
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/** The collector used by templates compiled with this compiler. */
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public final Collector collector;
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/** Compiles the supplied template into a repeatedly executable intermediate form. */
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public Template compile (String template) {
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return compile(new StringReader(template));
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}
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/** Compiles the supplied template into a repeatedly executable intermediate form. */
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public Template compile (Reader source) {
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return Mustache.compile(source, this);
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}
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/** Returns a compiler that either does or does not escape HTML by default. */
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public Compiler escapeHTML (boolean escapeHTML) {
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return new Compiler(escapeHTML, this.standardsMode, this.nullValue, this.missingIsNull,
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this.emptyStringIsFalse, this.loader, this.collector);
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}
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/** Returns a compiler that either does or does not use standards mode. Standards mode
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* disables the non-standard JMustache extensions like looking up missing names in a parent
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* context. */
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public Compiler standardsMode (boolean standardsMode) {
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return new Compiler(this.escapeHTML, standardsMode, this.nullValue, this.missingIsNull,
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this.emptyStringIsFalse, this.loader, this.collector);
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}
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/** Returns a compiler that will use the given value for any variable that is missing, or
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* otherwise resolves to null. This is like {@link #nullValue} except that it returns the
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* supplied default for missing keys and existing keys that return null values. */
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public Compiler defaultValue (String defaultValue) {
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return new Compiler(this.escapeHTML, this.standardsMode, defaultValue, true,
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this.emptyStringIsFalse, this.loader, this.collector);
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}
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/** Returns a compiler that will use the given value for any variable that resolves to
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* null, but will still raise an exception for variables for which an accessor cannot be
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* found. This is like {@link #defaultValue} except that it differentiates between missing
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* accessors, and accessors that exist but return null.
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* <ul>
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* <li>In the case of a Java object being used as a context, if no field or method can be
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* found for a variable, an exception will be raised.</li>
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* <li>In the case of a {@link Map} being used as a context, all possible accessors are
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* assumed to exist (but potentially return null), and no exception will ever be
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* raised.</li>
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* </ul> */
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public Compiler nullValue (String nullValue) {
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return new Compiler(this.escapeHTML, this.standardsMode, nullValue, false,
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this.emptyStringIsFalse, this.loader, this.collector);
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}
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/** Returns a compiler that will treat empty string as a false value if parameter is true. */
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public Compiler emptyStringIsFalse (boolean emptyStringIsFalse) {
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return new Compiler(this.escapeHTML, this.standardsMode, this.nullValue,
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this.missingIsNull, emptyStringIsFalse, this.loader, this.collector);
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}
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/** Returns a compiler configured to use the supplied template loader to handle partials. */
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public Compiler withLoader (TemplateLoader loader) {
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return new Compiler(this.escapeHTML, this.standardsMode, this.nullValue,
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this.missingIsNull, this.emptyStringIsFalse, loader, this.collector);
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}
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/** Returns a compiler configured to use the supplied collector. */
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public Compiler withCollector (Collector collector) {
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return new Compiler(this.escapeHTML, this.standardsMode, this.nullValue,
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this.missingIsNull, this.emptyStringIsFalse, this.loader, collector);
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}
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/** Returns the value to use in the template for the null-valued property {@code name}. See
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* {@link #nullValue} for more details. */
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public String computeNullValue (String name) {
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return (nullValue == null) ? null : nullValue.replace("{{name}}", name);
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}
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protected Compiler (boolean escapeHTML, boolean standardsMode, String nullValue,
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boolean missingIsNull, boolean emptyStringIsFalse, TemplateLoader loader,
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Collector collector) {
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this.escapeHTML = escapeHTML;
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this.standardsMode = standardsMode;
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this.nullValue = nullValue;
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this.missingIsNull = missingIsNull;
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this.emptyStringIsFalse = emptyStringIsFalse;
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this.loader = loader;
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this.collector = collector;
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}
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}
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/** Used to handle partials. */
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public interface TemplateLoader
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{
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/** Returns a reader for the template with the supplied name.
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* @throws Exception if the template could not be loaded for any reason. */
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Reader getTemplate (String name) throws Exception;
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}
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/** Used to handle lambdas. */
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public interface Lambda
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{
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/** Executes this lambda on the supplied template fragment. The lambda should write its
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* results to {@code out}.
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*
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* @param tmpl the fragment of the template that was passed to the lambda.
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* @param out the writer to which the lambda should write its output.
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*/
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void execute (Template.Fragment frag, Writer out) throws IOException;
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}
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/** Used to read variables from values. */
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public interface VariableFetcher
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{
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/** Reads the so-named variable from the supplied context object. */
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Object get (Object ctx, String name) throws Exception;
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}
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/** Handles interpreting objects as collections. */
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public interface Collector
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{
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/** Returns an iterator that can iterate over the supplied value, or null if the value is
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* not a collection. */
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Iterator<?> toIterator (final Object value);
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/** Creates a fetcher for a so-named variable in the supplied context object, which will
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* never be null. The fetcher will be cached and reused for future contexts for which
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* {@code octx.getClass().equals(nctx.getClass()}. */
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VariableFetcher createFetcher (Object ctx, String name);
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/** Creates a map to be used to cache {@link VariableFetcher} instances. The GWT-compatible
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* collector returns a HashMap here, but the reflection based fetcher (which only works on
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* the JVM and Android, returns a concurrent hashmap. */
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<K,V> Map<K,V> createFetcherCache ();
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}
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/**
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* Returns a compiler that escapes HTML by default and does not use standards mode.
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*/
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public static Compiler compiler ()
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{
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return new Compiler(true, false, null, true, false, FAILING_LOADER, new DefaultCollector());
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}
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/**
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* Compiles the supplied template into a repeatedly executable intermediate form.
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*/
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protected static Template compile (Reader source, Compiler compiler)
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{
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Accumulator accum = new Parser(compiler).parse(source);
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return new Template(accum.finish(), compiler);
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}
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private Mustache () {} // no instantiateski
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protected static void restoreStartTag (StringBuilder text, Delims starts)
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{
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text.insert(0, starts.start1);
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if (starts.start2 != NO_CHAR) {
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text.insert(1, starts.start2);
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}
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}
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protected static String escapeHTML (String text)
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{
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for (String[] escape : ATTR_ESCAPES) {
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text = text.replace(escape[0], escape[1]);
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}
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return text;
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}
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protected static boolean allowsWhitespace (char typeChar)
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{
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return (typeChar == '=') || // change delimiters
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(typeChar == '!'); // comment
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}
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protected static final int TEXT = 0;
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protected static final int MATCHING_START = 1;
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protected static final int MATCHING_END = 2;
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protected static final int TAG = 3;
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// a hand-rolled parser; whee!
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protected static class Parser {
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final Delims delims = new Delims();
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final StringBuilder text = new StringBuilder();
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Reader source;
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Accumulator accum;
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int state = TEXT;
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int line = 1, column = 0;
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int tagStartColumn = -1;
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boolean skipNewline = false;
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public Parser (Compiler compiler) {
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this.accum = new Accumulator(compiler);
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}
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public Accumulator parse (Reader source) {
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this.source = source;
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while (true) {
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char c;
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try {
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int v = source.read();
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if (v == -1) {
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break;
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}
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c = (char)v;
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} catch (IOException e) {
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throw new MustacheException(e);
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}
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if (c == '\n') {
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column = 0;
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line++;
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// skip this newline character if we're configured to do so; TODO: handle CR
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if (skipNewline) {
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skipNewline = false;
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continue;
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}
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} else {
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column++;
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skipNewline = false;
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}
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parseChar(c);
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}
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// accumulate any trailing text
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switch (state) {
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case TAG:
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restoreStartTag(text, delims);
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break;
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case MATCHING_END:
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restoreStartTag(text, delims);
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text.append(delims.end1);
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break;
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case MATCHING_START:
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text.append(delims.start1);
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break;
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// case TEXT: // do nothing
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}
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accum.addTextSegment(text);
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return accum;
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}
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protected void parseChar (char c) {
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switch (state) {
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case TEXT:
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if (c == delims.start1) {
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state = MATCHING_START;
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tagStartColumn = column;
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if (delims.start2 == NO_CHAR) {
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parseChar(NO_CHAR);
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}
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} else {
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text.append(c);
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}
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break;
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case MATCHING_START:
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if (c == delims.start2) {
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accum.addTextSegment(text);
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state = TAG;
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} else {
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text.append(delims.start1);
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state = TEXT;
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parseChar(c);
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}
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break;
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case TAG:
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if (c == delims.end1) {
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state = MATCHING_END;
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if (delims.end2 == NO_CHAR) {
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parseChar(NO_CHAR);
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}
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} else if (c == delims.start1 && text.length() > 0) {
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// if we've already matched some tag characters and we see a new start tag
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// character (e.g. "{{foo {" but not "{{{"), treat the already matched text as
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// plain text and start matching a new tag from this point
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restoreStartTag(text, delims);
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accum.addTextSegment(text);
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tagStartColumn = column;
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if (delims.start2 == NO_CHAR) {
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accum.addTextSegment(text);
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state = TAG;
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} else {
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state = MATCHING_START;
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}
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} else {
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text.append(c);
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}
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break;
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case MATCHING_END:
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if (c == delims.end2) {
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if (text.charAt(0) == '=') {
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delims.updateDelims(text.substring(1, text.length()-1));
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text.setLength(0);
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} else {
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// if we haven't remapped the delimiters, and the tag starts with {{{ then
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// require that it end with }}} and disable HTML escaping
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if (delims.isDefault() && text.charAt(0) == delims.start1) {
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try {
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// we've only parsed }} at this point, so we have to slurp in
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// another character from the input stream and check it
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int end3 = (char)source.read();
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if (end3 != '}') {
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throw new MustacheParseException(
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"Invalid triple-mustache tag: {{{" + text + "}}", line);
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}
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} catch (IOException e) {
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throw new MustacheException(e);
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}
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// convert it into (equivalent) {{&text}} which addTagSegment handles
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text.replace(0, 1, "&");
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}
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// process the tag between the mustaches
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accum = accum.addTagSegment(text, line);
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skipNewline = (tagStartColumn == 1) && accum.justOpenedOrClosedBlock();
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}
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state = TEXT;
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} else {
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text.append(delims.end1);
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state = TAG;
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parseChar(c);
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}
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break;
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}
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}
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}
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protected static class Delims {
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public char start1 = '{';
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public char start2 = '{';
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public char end1 = '}';
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public char end2 = '}';
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public boolean isDefault () {
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return start1 == '{' && start2 == '{' && end1 == '}' && end2 == '}';
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}
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public void updateDelims (String dtext) {
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String errmsg = "Invalid delimiter configuration '" + dtext + "'. Must be of the " +
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"form {{=1 2=}} or {{=12 34=}} where 1, 2, 3 and 4 are delimiter chars.";
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String[] delims = dtext.split(" ");
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if (delims.length != 2) throw new MustacheException(errmsg);
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switch (delims[0].length()) {
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case 1:
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start1 = delims[0].charAt(0);
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start2 = NO_CHAR;
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break;
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case 2:
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start1 = delims[0].charAt(0);
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start2 = delims[0].charAt(1);
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break;
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default:
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throw new MustacheException(errmsg);
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}
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switch (delims[1].length()) {
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case 1:
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end1 = delims[1].charAt(0);
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end2 = NO_CHAR;
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break;
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case 2:
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end1 = delims[1].charAt(0);
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end2 = delims[1].charAt(1);
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break;
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default:
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throw new MustacheException(errmsg);
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}
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}
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}
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protected static class Accumulator {
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public Accumulator (Compiler compiler) {
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_compiler = compiler;
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}
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public boolean justOpenedOrClosedBlock () {
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// return true if we just closed a block segment; we'll handle just opened elsewhere
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return (!_segs.isEmpty() && _segs.get(_segs.size()-1) instanceof BlockSegment);
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}
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public void addTextSegment (StringBuilder text) {
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if (text.length() > 0) {
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_segs.add(new StringSegment(text.toString()));
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text.setLength(0);
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}
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}
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public Accumulator addTagSegment (final StringBuilder accum, final int tagLine) {
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final Accumulator outer = this;
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String tag = accum.toString().trim();
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final String tag1 = tag.substring(1).trim();
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accum.setLength(0);
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switch (tag.charAt(0)) {
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case '#':
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requireNoNewlines(tag, tagLine);
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return new Accumulator(_compiler) {
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@Override public boolean justOpenedOrClosedBlock () {
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// if we just opened this section, we'll have no segments
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return (_segs.isEmpty()) || super.justOpenedOrClosedBlock();
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}
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@Override public Template.Segment[] finish () {
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throw new MustacheParseException(
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"Section missing close tag '" + tag1 + "'", tagLine);
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}
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@Override protected Accumulator addCloseSectionSegment (String itag, int line) {
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requireSameName(tag1, itag, line);
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outer._segs.add(
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new SectionSegment(itag, super.finish(), tagLine, _compiler));
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return outer;
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}
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};
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case '>':
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_segs.add(new IncludedTemplateSegment(tag1, _compiler));
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return this;
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case '^':
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requireNoNewlines(tag, tagLine);
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return new Accumulator(_compiler) {
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@Override public boolean justOpenedOrClosedBlock () {
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// if we just opened this section, we'll have no segments
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return (_segs.isEmpty()) || super.justOpenedOrClosedBlock();
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}
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@Override public Template.Segment[] finish () {
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throw new MustacheParseException(
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"Inverted section missing close tag '" + tag1 + "'", tagLine);
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}
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@Override protected Accumulator addCloseSectionSegment (String itag, int line) {
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requireSameName(tag1, itag, line);
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outer._segs.add(new InvertedSectionSegment(itag, super.finish(), tagLine));
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return outer;
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}
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};
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case '/':
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requireNoNewlines(tag, tagLine);
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return addCloseSectionSegment(tag1, tagLine);
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case '!':
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// comment!, ignore
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return this;
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case '&':
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requireNoNewlines(tag, tagLine);
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_segs.add(new VariableSegment(tag1, false, tagLine));
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return this;
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default:
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requireNoNewlines(tag, tagLine);
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_segs.add(new VariableSegment(tag, _compiler.escapeHTML, tagLine));
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return this;
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}
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}
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public Template.Segment[] finish () {
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return _segs.toArray(new Template.Segment[_segs.size()]);
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}
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protected Accumulator addCloseSectionSegment (String tag, int line) {
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|
throw new MustacheParseException(
|
|
"Section close tag with no open tag '" + tag + "'", line);
|
|
}
|
|
|
|
protected static void requireNoNewlines (String tag, int line) {
|
|
if (tag.indexOf("\n") != -1 || tag.indexOf("\r") != -1) {
|
|
throw new MustacheParseException(
|
|
"Invalid tag name: contains newline '" + tag + "'", line);
|
|
}
|
|
}
|
|
|
|
protected static void requireSameName (String name1, String name2, int line)
|
|
{
|
|
if (!name1.equals(name2)) {
|
|
throw new MustacheParseException("Section close tag with mismatched open tag '" +
|
|
name2 + "' != '" + name1 + "'", line);
|
|
}
|
|
}
|
|
|
|
protected final Compiler _compiler;
|
|
protected final List<Template.Segment> _segs = new ArrayList<Template.Segment>();
|
|
}
|
|
|
|
/** A simple segment that reproduces a string. */
|
|
protected static class StringSegment extends Template.Segment {
|
|
public StringSegment (String text) {
|
|
_text = text;
|
|
}
|
|
@Override public void execute (Template tmpl, Template.Context ctx, Writer out) {
|
|
write(out, _text);
|
|
}
|
|
protected final String _text;
|
|
}
|
|
|
|
protected static class IncludedTemplateSegment extends Template.Segment {
|
|
public IncludedTemplateSegment (String name, Compiler compiler) {
|
|
_name = name;
|
|
_compiler = compiler;
|
|
}
|
|
@Override public void execute (Template tmpl, Template.Context ctx, Writer out) {
|
|
// we compile our template lazily to avoid infinie recursion if a template includes
|
|
// itself (see issue #13)
|
|
if (_template == null) {
|
|
try {
|
|
_template = _compiler.compile(_compiler.loader.getTemplate(_name));
|
|
} catch (Exception e) {
|
|
if (e instanceof RuntimeException) {
|
|
throw (RuntimeException)e;
|
|
} else {
|
|
throw new MustacheException("Unable to load template: " + _name, e);
|
|
}
|
|
}
|
|
}
|
|
// we must take care to preserve our context rather than creating a new one, which
|
|
// would happen if we just called execute() with ctx.data
|
|
_template.executeSegs(ctx, out);
|
|
}
|
|
protected final String _name;
|
|
protected final Compiler _compiler;
|
|
protected Template _template;
|
|
}
|
|
|
|
/** A helper class for named segments. */
|
|
protected static abstract class NamedSegment extends Template.Segment {
|
|
protected NamedSegment (String name, int line) {
|
|
_name = name.intern();
|
|
_line = line;
|
|
}
|
|
protected final String _name;
|
|
protected final int _line;
|
|
}
|
|
|
|
/** A segment that substitutes the contents of a variable. */
|
|
protected static class VariableSegment extends NamedSegment {
|
|
public VariableSegment (String name, boolean escapeHTML, int line) {
|
|
super(name, line);
|
|
_escapeHTML = escapeHTML;
|
|
}
|
|
@Override public void execute (Template tmpl, Template.Context ctx, Writer out) {
|
|
Object value = tmpl.getValueOrDefault(ctx, _name, _line);
|
|
if (value == null) {
|
|
throw new MustacheException(
|
|
"No key, method or field with name '" + _name + "' on line " + _line);
|
|
}
|
|
String text = String.valueOf(value);
|
|
write(out, _escapeHTML ? escapeHTML(text) : text);
|
|
}
|
|
protected boolean _escapeHTML;
|
|
}
|
|
|
|
/** A helper class for block segments. */
|
|
protected static abstract class BlockSegment extends NamedSegment {
|
|
protected BlockSegment (String name, Template.Segment[] segs, int line) {
|
|
super(name, line);
|
|
_segs = segs;
|
|
}
|
|
protected void executeSegs (Template tmpl, Template.Context ctx, Writer out) {
|
|
for (Template.Segment seg : _segs) {
|
|
seg.execute(tmpl, ctx, out);
|
|
}
|
|
}
|
|
protected final Template.Segment[] _segs;
|
|
}
|
|
|
|
/** A segment that represents a section. */
|
|
protected static class SectionSegment extends BlockSegment {
|
|
public SectionSegment (String name, Template.Segment[] segs, int line, Compiler compiler) {
|
|
super(name, segs, line);
|
|
_compiler = compiler;
|
|
}
|
|
@Override public void execute (Template tmpl, Template.Context ctx, Writer out) {
|
|
Object value = tmpl.getSectionValue(ctx, _name, _line); // won't return null
|
|
Iterator<?> iter = tmpl._compiler.collector.toIterator(value);
|
|
if (iter != null) {
|
|
int index = 0;
|
|
while (iter.hasNext()) {
|
|
Object elem = iter.next();
|
|
boolean onFirst = (index == 0), onLast = !iter.hasNext();
|
|
executeSegs(tmpl, ctx.nest(elem, ++index, onFirst, onLast), out);
|
|
}
|
|
} else if (value instanceof Boolean) {
|
|
if ((Boolean)value) {
|
|
executeSegs(tmpl, ctx, out);
|
|
}
|
|
} else if (value instanceof Lambda) {
|
|
try {
|
|
((Lambda)value).execute(tmpl.createFragment(_segs, ctx), out);
|
|
} catch (IOException ioe) {
|
|
throw new MustacheException(ioe);
|
|
}
|
|
} else if (_compiler.emptyStringIsFalse && "".equals(value)) {
|
|
// omit the section
|
|
} else {
|
|
executeSegs(tmpl, ctx.nest(value, 0, false, false), out);
|
|
}
|
|
}
|
|
protected final Compiler _compiler;
|
|
}
|
|
|
|
/** A segment that represents an inverted section. */
|
|
protected static class InvertedSectionSegment extends BlockSegment {
|
|
public InvertedSectionSegment (String name, Template.Segment[] segs, int line) {
|
|
super(name, segs, line);
|
|
}
|
|
@Override public void execute (Template tmpl, Template.Context ctx, Writer out) {
|
|
Object value = tmpl.getSectionValue(ctx, _name, _line); // won't return null
|
|
Iterator<?> iter = tmpl._compiler.collector.toIterator(value);
|
|
if (iter != null) {
|
|
if (!iter.hasNext()) {
|
|
executeSegs(tmpl, ctx, out);
|
|
}
|
|
} else if (value instanceof Boolean) {
|
|
if (!(Boolean)value) {
|
|
executeSegs(tmpl, ctx, out);
|
|
}
|
|
} // TODO: fail?
|
|
}
|
|
}
|
|
|
|
/** Map of strings that must be replaced inside html attributes and their replacements. (They
|
|
* need to be applied in order so amps are not double escaped.) */
|
|
protected static final String[][] ATTR_ESCAPES = {
|
|
{ "&", "&" },
|
|
{ "'", "'" },
|
|
{ "\"", """ },
|
|
{ "<", "<" },
|
|
{ ">", ">" },
|
|
};
|
|
|
|
/** Used when we have only a single character delimiter. */
|
|
protected static final char NO_CHAR = Character.MIN_VALUE;
|
|
|
|
protected static final TemplateLoader FAILING_LOADER = new TemplateLoader() {
|
|
public Reader getTemplate (String name) {
|
|
throw new UnsupportedOperationException("Template loading not configured");
|
|
}
|
|
};
|
|
}
|