Adam Gent
1263 lines
52 KiB
Java
1263 lines
52 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.Arrays;
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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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/** Compiles templates into executable form. See {@link Mustache}. */
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public static class Compiler {
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/** Whether or not standards mode is enabled. */
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public final boolean standardsMode;
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/** Whether or not to throw an exception when a section resolves to a missing value. If
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* false, the section is simply omitted (or included in the case of inverse sections). If
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* true, a {@code MustacheException} is thrown. */
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public final boolean strictSections;
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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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/** If this value is true, zero 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 zeroIsFalse;
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/** Handles converting objects to strings when rendering a template. The default formatter
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* uses {@link String#valueOf}. */
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public final Formatter formatter;
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/** Handles escaping characters in substituted text. */
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public final Escaper escaper;
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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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/** The delimiters used by default in templates compiled with this compiler. */
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public final Delims delims;
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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. Note: this
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* overrides any escaper set via {@link #withEscaper}. */
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public Compiler escapeHTML (boolean escapeHTML) {
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return withEscaper(escapeHTML ? Escapers.HTML : Escapers.NONE);
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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(standardsMode, this.strictSections, this.nullValue,
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this.missingIsNull, this.emptyStringIsFalse, this.zeroIsFalse,
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this.formatter, this.escaper, this.loader, this.collector,
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this.delims);
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}
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/** Returns a compiler that throws an exception when a section references a missing value
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* ({@code true}) or treats a missing value as {@code false} ({@code false}, the default).
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*/
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public Compiler strictSections (boolean strictSections) {
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return new Compiler(this.standardsMode, strictSections, this.nullValue,
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this.missingIsNull, this.emptyStringIsFalse, this.zeroIsFalse,
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this.formatter, this.escaper, this.loader, this.collector,
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this.delims);
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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.standardsMode, this.strictSections, defaultValue, true,
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this.emptyStringIsFalse, this.zeroIsFalse, this.formatter,
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this.escaper, this.loader, this.collector, this.delims);
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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, if the map does not contain
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* a mapping for a variable, an exception will be raised. If the map contains a mapping
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* which maps to {@code null}, then {@code nullValue} is used.</li>
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* </ul> */
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public Compiler nullValue (String nullValue) {
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return new Compiler(this.standardsMode, this.strictSections, nullValue, false,
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this.emptyStringIsFalse, this.zeroIsFalse, this.formatter,
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this.escaper, this.loader, this.collector, this.delims);
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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.standardsMode, this.strictSections, this.nullValue,
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this.missingIsNull, emptyStringIsFalse, this.zeroIsFalse,
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this.formatter, this.escaper, this.loader, this.collector,
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this.delims);
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}
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/** Returns a compiler that will treat zero as a false value if parameter is true. */
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public Compiler zeroIsFalse (boolean zeroIsFalse) {
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return new Compiler(this.standardsMode, this.strictSections, this.nullValue,
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this.missingIsNull, this.emptyStringIsFalse, zeroIsFalse,
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this.formatter, this.escaper, this.loader, this.collector,
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this.delims);
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}
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/** Configures the {@link Formatter} used to turn objects into strings. */
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public Compiler withFormatter (Formatter formatter) {
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return new Compiler(this.standardsMode, this.strictSections, this.nullValue,
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this.missingIsNull, this.emptyStringIsFalse, this.zeroIsFalse,
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formatter, this.escaper, this.loader, this.collector, this.delims);
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}
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/** Configures the {@link Escaper} used to escape substituted text. */
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public Compiler withEscaper (Escaper escaper) {
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return new Compiler(this.standardsMode, this.strictSections, this.nullValue,
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this.missingIsNull, this.emptyStringIsFalse, this.zeroIsFalse,
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this.formatter, escaper, this.loader, this.collector, this.delims);
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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.standardsMode, this.strictSections, this.nullValue,
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this.missingIsNull, this.emptyStringIsFalse, this.zeroIsFalse,
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this.formatter, this.escaper, loader, this.collector, this.delims);
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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.standardsMode, this.strictSections, this.nullValue,
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this.missingIsNull, this.emptyStringIsFalse, this.zeroIsFalse,
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this.formatter, this.escaper, this.loader, collector, this.delims);
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}
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/** Returns a compiler configured to use the supplied delims as default delimiters.
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* @param delims a string of the form {@code AB CD} or {@code A D} where A and B are
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* opening delims and C and D are closing delims. */
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public Compiler withDelims (String delims) {
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return new Compiler(this.standardsMode, this.strictSections, this.nullValue,
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this.missingIsNull, this.emptyStringIsFalse, this.zeroIsFalse,
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this.formatter, this.escaper, this.loader, this.collector,
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new Delims().updateDelims(delims));
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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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/** Returns true if the supplied value is "falsey". If {@link #emptyStringIsFalse} is true,
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* then empty strings are considered falsey. If {@link #zeroIsFalse} is true, then zero
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* values are considered falsey. */
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public boolean isFalsey (Object value) {
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return ((emptyStringIsFalse && isEmptyCharSequence(formatter.format(value))) ||
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(zeroIsFalse && (value instanceof Number) && ((Number)value).longValue() == 0));
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}
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/**
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* Replaces "".equals(value). E.g. only not null values with length 0.
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*/
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private boolean isEmptyCharSequence (Object value) {
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if (value == null) {
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return false;
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}
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if (value instanceof CharSequence) {
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return ((CharSequence) value).length() == 0;
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}
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return false;
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}
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/** Loads and compiles the template {@code name} using this compiler's configured template
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* loader. Note that this does no caching: the caller should cache the loaded template if
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* they expect to use it multiple times.
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* @return the compiled template.
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* @throw MustacheException if the template could not be loaded (due to I/O exception) or
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* compiled (due to syntax error, etc.).
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*/
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public Template loadTemplate (String name) throws MustacheException {
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Reader tin = null;
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try {
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tin = loader.getTemplate(name);
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return compile(tin);
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} catch (Exception e) {
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if (e instanceof RuntimeException) {
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throw (RuntimeException)e;
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} else {
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throw new MustacheException("Unable to load template: " + name, e);
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}
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} finally {
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if (tin != null) try {
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tin.close();
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} catch (IOException ioe) {
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throw new RuntimeException(ioe);
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}
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}
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}
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protected Compiler (boolean standardsMode, boolean strictSections, String nullValue,
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boolean missingIsNull, boolean emptyStringIsFalse, boolean zeroIsFalse,
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Formatter formatter, Escaper escaper, TemplateLoader loader,
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Collector collector, Delims delims) {
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this.standardsMode = standardsMode;
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this.strictSections = strictSections;
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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.zeroIsFalse = zeroIsFalse;
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this.formatter = formatter;
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this.escaper = escaper;
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this.loader = loader;
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this.collector = collector;
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this.delims = delims;
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}
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}
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/** Handles converting objects to strings when rendering templates. */
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public interface Formatter {
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/** Converts {@code value} to a CharSequence for inclusion in a template. */
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CharSequence format (Object value);
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}
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/** Handles lambdas. */
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public interface Lambda {
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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 frag 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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/** Handles lambdas that are also invoked for inverse sections.. */
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public interface InvertibleLambda extends Lambda {
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/** Executes this lambda on the supplied template fragment, when the lambda is used in an
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* inverse section. The lambda should write its results to {@code out}.
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*
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* @param frag 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 executeInverse (Template.Fragment frag, Writer out) throws IOException;
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}
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/** Reads variables from context objects. */
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public interface VariableFetcher {
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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 escaping characters in substituted text. */
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public interface Escaper {
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/** Returns {@code raw} with the appropriate characters replaced with escape sequences. */
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String escape (String raw);
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/** Returns {@code raw} with the appropriate characters replaced with escape sequences. **/
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default CharSequence escape (CharSequence raw) {
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return escape(raw.toString());
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}
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}
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/** Handles loading partial templates. */
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public interface TemplateLoader {
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/** Returns a reader for the template with the supplied name.
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* Reader will be closed by callee.
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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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/** Handles interpreting objects as collections. */
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public interface Collector {
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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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* Provides a means to implement custom logic for variable lookup. If a context object
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* implements this interface, its {@code get} method will be used to look up variables instead
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* of the usual methods.
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*
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* This is simpler than having a context implement {@link Map} which would require that it also
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* support the {@link Map#entrySet} method for iteration. A {@code CustomContext} object cannot
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* be used for a list section.
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*/
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public interface CustomContext {
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/** Fetches the value of a variable named {@code name}. */
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Object get (String name) throws Exception;
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}
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/** Used to visit the tags in a template without executing it. */
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public interface Visitor {
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/** Visits a text segment. These are blocks of text that are normally just reproduced as
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* is when executing a template.
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* @param text the block of text. May contain newlines.
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*/
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void visitText (String text);
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/** Visits a variable tag.
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* @param name the name of the variable.
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*/
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void visitVariable (String name);
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/** Visits an include (partial) tag.
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* @param name the name of the partial template specified by the tag.
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* @return true if the template should be resolved and visited, false to skip it.
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*/
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boolean visitInclude (String name);
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/** Visits a section tag.
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* @param name the name of the section.
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* @return true if the contents of the section should be visited, false to skip.
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*/
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boolean visitSection (String name);
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/** Visits an inverted section tag.
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* @param name the name of the inverted section.
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* @return true if the contents of the section should be visited, false to skip.
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*/
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boolean visitInvertedSection (String name);
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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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return new Compiler(/*standardsMode=*/false, /*strictSections=*/false, /*nullValue=*/null,
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/*missingIsNull=*/false, /*emptyStringIsFalse=*/false,
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/*zeroIsFalse=*/false, DEFAULT_FORMATTER, Escapers.HTML, FAILING_LOADER,
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new DefaultCollector(), new Delims());
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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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Accumulator accum = new Parser(compiler).parse(source);
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return new Template(trim(accum.finish(), true), compiler);
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}
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private Mustache () {} // no instantiateski
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protected static Template.Segment[] trim (Template.Segment[] segs, boolean top) {
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// Trim modifies segs! It's return is not a copy!
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// now that we have all of our segments, we make a pass through them to trim whitespace
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// from section tags which stand alone on their lines
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assert segs != null;
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for (int ii = 0, ll = segs.length; ii < ll; ii++) {
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Template.Segment seg = segs[ii];
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Template.Segment pseg = (ii > 0 ) ? segs[ii-1] : null;
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Template.Segment nseg = (ii < ll-1) ? segs[ii+1] : null;
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StringSegment prev = (pseg instanceof StringSegment) ? (StringSegment)pseg : null;
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StringSegment next = (nseg instanceof StringSegment) ? (StringSegment)nseg : null;
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// if we're at the top-level there are virtual "blank lines" before & after segs
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boolean prevBlank = ((pseg == null && top) || (prev != null && prev.trailsBlank()));
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boolean nextBlank = ((nseg == null && top) || (next != null && next.leadsBlank()));
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// potentially trim around the open and close tags of a block segment
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if (seg instanceof BlockSegment) {
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BlockSegment block = (BlockSegment)seg;
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if (prevBlank && block.firstLeadsBlank()) {
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if (pseg != null) segs[ii-1] = prev.trimTrailBlank();
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block.trimFirstBlank();
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block._standaloneStart = true;
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}
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if (nextBlank && block.lastTrailsBlank()) {
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block.trimLastBlank();
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if (nseg != null) segs[ii+1] = next.trimLeadBlank();
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block._standaloneEnd = true;
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}
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}
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// we have to indent partials if there is space before
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// they are also standalone...
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else if (seg instanceof IncludedTemplateSegment) {
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IncludedTemplateSegment include = (IncludedTemplateSegment) seg;
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if (prev != null && prevBlank && nextBlank) {
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String indent = prev.indent();
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include._standalone = true;
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if (! indent.equals("")) {
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include = include.indent(indent, pseg == null,nseg == null);
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segs[ii] = include;
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}
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//segs[ii-1] = prev.trimTrailBlank();
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/*
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* We trim the end because partials
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* follow standalone just like blocks
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*/
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if (next != null) {
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segs[ii+1] = next.trimLeadBlank();
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}
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}
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}
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// potentially trim around non-printing (comments/delims) segments
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else if (seg instanceof FauxSegment) {
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if (prevBlank && nextBlank) {
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if (pseg != null) segs[ii-1] = prev.trimTrailBlank();
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if (nseg != null) segs[ii+1] = next.trimLeadBlank();
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}
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}
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}
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return segs;
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}
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|
|
static Template.Segment[] indentSegs(Template.Segment[] _segs, String indent) {
|
|
// unlike trim this method clones the segments if they have changed
|
|
// so the return value must be handled
|
|
// a simple identity check on the return can be used to determine
|
|
// if there is change
|
|
if (indent.equals("")) {
|
|
return _segs;
|
|
}
|
|
int length = _segs.length;
|
|
Template.Segment[] copySegs = new Template.Segment[length];
|
|
boolean changed = false;
|
|
for (int i = 0; i < _segs.length; i++) {
|
|
|
|
Template.Segment seg = _segs[i];
|
|
Template.Segment pseg = (i > 0) ? _segs[i-1] : null;
|
|
Template.Segment nseg = (i < length - 1) ? _segs[i+1] : null;
|
|
/*
|
|
* If we are the first segment then we rely on the indentation
|
|
* already present before the partial tag.
|
|
* [ WS ]{{> partial }}
|
|
*
|
|
* That is partial tags do not have the trailing blank
|
|
* removed.
|
|
*
|
|
* This avoids needlessley creating StringSegment tags.
|
|
*/
|
|
boolean first = pseg == null ? false : seg.isStandalone() || pseg.isStandalone();
|
|
boolean last;
|
|
if (nseg instanceof BlockSegment){
|
|
BlockSegment bs = (BlockSegment) nseg;
|
|
last = bs.isStandaloneStart();
|
|
}
|
|
else if (nseg == null || nseg.isStandalone()) {
|
|
last = false;
|
|
}
|
|
else {
|
|
last = true;
|
|
}
|
|
/*
|
|
* Recursively indent
|
|
*/
|
|
Template.Segment copy = seg.indent(indent, first, last);
|
|
if (copy != seg) {
|
|
changed = true;
|
|
}
|
|
copySegs[i] = copy;
|
|
}
|
|
if (changed) {
|
|
return copySegs;
|
|
}
|
|
return _segs;
|
|
}
|
|
|
|
protected static void restoreStartTag (StringBuilder text, Delims starts) {
|
|
text.insert(0, starts.start1);
|
|
if (starts.start2 != NO_CHAR) {
|
|
text.insert(1, starts.start2);
|
|
}
|
|
}
|
|
|
|
// TODO: this method was never called, what was my intention here?
|
|
protected static boolean allowsWhitespace (char typeChar) {
|
|
return (typeChar == '=' /* change delimiters */) || (typeChar == '!' /* comment */);
|
|
}
|
|
|
|
protected static final int TEXT = 0;
|
|
protected static final int MATCHING_START = 1;
|
|
protected static final int MATCHING_END = 2;
|
|
protected static final int TAG = 3;
|
|
|
|
// a hand-rolled parser; whee!
|
|
protected static class Parser {
|
|
final Delims delims;
|
|
final StringBuilder text = new StringBuilder();
|
|
|
|
Reader source;
|
|
Accumulator accum;
|
|
|
|
int state = TEXT;
|
|
int line = 1, column = 0;
|
|
int tagStartColumn = -1;
|
|
|
|
public Parser (Compiler compiler) {
|
|
this.accum = new Accumulator(compiler, true);
|
|
this.delims = compiler.delims.copy();
|
|
}
|
|
|
|
public Accumulator parse (Reader source) {
|
|
this.source = source;
|
|
|
|
int v;
|
|
while ((v = nextChar()) != -1) {
|
|
char c = (char)v;
|
|
++column; // our columns start at one, so increment before parse
|
|
parseChar(c);
|
|
// if we just parsed a newline, reset the column to zero and advance line
|
|
if (c == '\n') {
|
|
column = 0;
|
|
++line;
|
|
}
|
|
}
|
|
|
|
// accumulate any trailing text
|
|
switch (state) {
|
|
case TAG:
|
|
restoreStartTag(text, delims);
|
|
break;
|
|
case MATCHING_END:
|
|
restoreStartTag(text, delims);
|
|
text.append(delims.end1);
|
|
break;
|
|
case MATCHING_START:
|
|
text.append(delims.start1);
|
|
break;
|
|
case TEXT: // do nothing
|
|
break;
|
|
}
|
|
accum.addTextSegment(text);
|
|
|
|
return accum;
|
|
}
|
|
|
|
protected void parseChar (char c) {
|
|
switch (state) {
|
|
case TEXT:
|
|
if (c == delims.start1) {
|
|
state = MATCHING_START;
|
|
tagStartColumn = column;
|
|
if (delims.start2 == NO_CHAR) {
|
|
parseChar(NO_CHAR);
|
|
}
|
|
} else {
|
|
text.append(c);
|
|
}
|
|
break;
|
|
|
|
case MATCHING_START:
|
|
if (c == delims.start2) {
|
|
accum.addTextSegment(text);
|
|
state = TAG;
|
|
} else {
|
|
text.append(delims.start1);
|
|
state = TEXT;
|
|
parseChar(c);
|
|
}
|
|
break;
|
|
|
|
case TAG:
|
|
if (c == delims.end1) {
|
|
state = MATCHING_END;
|
|
if (delims.end2 == NO_CHAR) {
|
|
parseChar(NO_CHAR);
|
|
}
|
|
|
|
} else if (c == delims.start1 && text.length() > 0 && text.charAt(0) != '!') {
|
|
// if we've already matched some tag characters and we see a new start tag
|
|
// character (e.g. "{{foo {" but not "{{{"), treat the already matched text as
|
|
// plain text and start matching a new tag from this point, unless we're in
|
|
// a comment tag.
|
|
restoreStartTag(text, delims);
|
|
accum.addTextSegment(text);
|
|
tagStartColumn = column;
|
|
if (delims.start2 == NO_CHAR) {
|
|
accum.addTextSegment(text);
|
|
state = TAG;
|
|
} else {
|
|
state = MATCHING_START;
|
|
}
|
|
|
|
} else {
|
|
text.append(c);
|
|
}
|
|
break;
|
|
|
|
case MATCHING_END:
|
|
if (c == delims.end2) {
|
|
if (text.charAt(0) == '=') {
|
|
delims.updateDelims(text.substring(1, text.length()-1));
|
|
text.setLength(0);
|
|
accum.addFauxSegment(); // for newline trimming
|
|
} else {
|
|
// if the delimiters are {{ and }}, and the tag starts with {{{ then
|
|
// require that it end with }}} and disable escaping
|
|
if (delims.isStaches() && text.charAt(0) == delims.start1) {
|
|
// we've only parsed }} at this point, so we have to slurp in another
|
|
// character from the input stream and check it
|
|
int end3 = nextChar();
|
|
if (end3 != '}') {
|
|
String got = (end3 == -1) ? "" : String.valueOf((char)end3);
|
|
throw new MustacheParseException(
|
|
"Invalid triple-mustache tag: {{" + text + "}}" + got, line);
|
|
}
|
|
// convert it into (equivalent) {{&text}} which addTagSegment handles
|
|
text.replace(0, 1, "&");
|
|
}
|
|
// process the tag between the mustaches
|
|
accum = accum.addTagSegment(text, line);
|
|
}
|
|
state = TEXT;
|
|
|
|
} else {
|
|
text.append(delims.end1);
|
|
state = TAG;
|
|
parseChar(c);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
protected int nextChar () {
|
|
try {
|
|
return source.read();
|
|
} catch (IOException ioe) {
|
|
throw new MustacheException(ioe);
|
|
}
|
|
}
|
|
}
|
|
|
|
protected static class Delims {
|
|
public char start1 = '{', end1 = '}';
|
|
public char start2 = '{', end2 = '}';
|
|
|
|
public boolean isStaches () {
|
|
return start1 == '{' && start2 == '{' && end1 == '}' && end2 == '}';
|
|
}
|
|
|
|
public Delims updateDelims (String dtext) {
|
|
String[] delims = dtext.split(" ");
|
|
if (delims.length != 2) throw new MustacheException(errmsg(dtext));
|
|
|
|
switch (delims[0].length()) {
|
|
case 1:
|
|
start1 = delims[0].charAt(0);
|
|
start2 = NO_CHAR;
|
|
break;
|
|
case 2:
|
|
start1 = delims[0].charAt(0);
|
|
start2 = delims[0].charAt(1);
|
|
break;
|
|
default:
|
|
throw new MustacheException(errmsg(dtext));
|
|
}
|
|
|
|
switch (delims[1].length()) {
|
|
case 1:
|
|
end1 = delims[1].charAt(0);
|
|
end2 = NO_CHAR;
|
|
break;
|
|
case 2:
|
|
end1 = delims[1].charAt(0);
|
|
end2 = delims[1].charAt(1);
|
|
break;
|
|
default:
|
|
throw new MustacheException(errmsg(dtext));
|
|
}
|
|
return this;
|
|
}
|
|
|
|
public void addTag (char prefix, String name, StringBuilder into) {
|
|
into.append(start1);
|
|
into.append(start2);
|
|
if (prefix != ' ') into.append(prefix);
|
|
into.append(name);
|
|
into.append(end1);
|
|
into.append(end2);
|
|
}
|
|
|
|
Delims copy () {
|
|
Delims d = new Delims();
|
|
d.start1 = start1;
|
|
d.start2 = start2;
|
|
d.end1 = end1;
|
|
d.end2 = end2;
|
|
return d;
|
|
}
|
|
|
|
private static String errmsg (String dtext) {
|
|
return "Invalid delimiter configuration '" + dtext + "'. Must be of the " +
|
|
"form {{=1 2=}} or {{=12 34=}} where 1, 2, 3 and 4 are delimiter chars.";
|
|
}
|
|
}
|
|
|
|
protected static class Accumulator {
|
|
public Accumulator (Compiler compiler, boolean topLevel) {
|
|
_comp = compiler;
|
|
_topLevel = topLevel;
|
|
}
|
|
|
|
public void addTextSegment (StringBuilder text) {
|
|
if (text.length() > 0) {
|
|
_segs.add(new StringSegment(text.toString(), _segs.isEmpty() && _topLevel));
|
|
text.setLength(0);
|
|
}
|
|
}
|
|
|
|
public Accumulator addTagSegment (final StringBuilder accum, final int tagLine) {
|
|
final Accumulator outer = this;
|
|
String tag = accum.toString().trim();
|
|
final String tag1 = tag.substring(1).trim();
|
|
accum.setLength(0);
|
|
|
|
switch (tag.charAt(0)) {
|
|
case '#':
|
|
requireNoNewlines(tag, tagLine);
|
|
return new Accumulator(_comp, false) {
|
|
@Override public Template.Segment[] finish () {
|
|
throw new MustacheParseException(
|
|
"Section missing close tag '" + tag1 + "'", tagLine);
|
|
}
|
|
@Override protected Accumulator addCloseSectionSegment (String itag, int line) {
|
|
requireSameName(tag1, itag, line);
|
|
outer._segs.add(new SectionSegment(_comp, itag, super.finish(), tagLine));
|
|
return outer;
|
|
}
|
|
};
|
|
|
|
case '>':
|
|
_segs.add(new IncludedTemplateSegment(_comp, tag1));
|
|
return this;
|
|
|
|
case '^':
|
|
requireNoNewlines(tag, tagLine);
|
|
return new Accumulator(_comp, false) {
|
|
@Override public Template.Segment[] finish () {
|
|
throw new MustacheParseException(
|
|
"Inverted section missing close tag '" + tag1 + "'", tagLine);
|
|
}
|
|
@Override protected Accumulator addCloseSectionSegment (String itag, int line) {
|
|
requireSameName(tag1, itag, line);
|
|
outer._segs.add(new InvertedSegment(_comp, itag, super.finish(), tagLine));
|
|
return outer;
|
|
}
|
|
};
|
|
|
|
case '/':
|
|
requireNoNewlines(tag, tagLine);
|
|
return addCloseSectionSegment(tag1, tagLine);
|
|
|
|
case '!':
|
|
// comment!, ignore
|
|
_segs.add(new FauxSegment()); // for whitespace trimming
|
|
return this;
|
|
|
|
case '&':
|
|
requireNoNewlines(tag, tagLine);
|
|
_segs.add(new VariableSegment(tag1, tagLine, _comp.formatter, Escapers.NONE));
|
|
return this;
|
|
|
|
default:
|
|
requireNoNewlines(tag, tagLine);
|
|
_segs.add(new VariableSegment(tag, tagLine, _comp.formatter, _comp.escaper));
|
|
return this;
|
|
}
|
|
}
|
|
|
|
public void addFauxSegment () {
|
|
_segs.add(new FauxSegment());
|
|
}
|
|
|
|
public Template.Segment[] finish () {
|
|
return _segs.toArray(new Template.Segment[_segs.size()]);
|
|
}
|
|
|
|
protected Accumulator addCloseSectionSegment (String tag, int line) {
|
|
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 _comp;
|
|
protected final boolean _topLevel;
|
|
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, boolean first) {
|
|
this(text, blankPos(text, true, first), blankPos(text, false, first), first);
|
|
}
|
|
|
|
public StringSegment (String text, int leadBlank, int trailBlank, boolean first) {
|
|
assert leadBlank >= -1;
|
|
assert trailBlank >= -1;
|
|
_text = text;
|
|
_leadBlank = leadBlank;
|
|
_trailBlank = trailBlank;
|
|
_first = first;
|
|
}
|
|
|
|
public boolean leadsBlank () { return _leadBlank != -1; }
|
|
public boolean trailsBlank () { return _trailBlank != -1; }
|
|
|
|
public StringSegment trimLeadBlank () {
|
|
if (_leadBlank == -1) return this;
|
|
int lpos = _leadBlank+1, newTrail = _trailBlank == -1 ? -1 : _trailBlank-lpos;
|
|
return new StringSegment(_text.substring(lpos), -1, newTrail, _first);
|
|
}
|
|
public StringSegment trimTrailBlank () {
|
|
return _trailBlank == -1 ? this : new StringSegment(
|
|
_text.substring(0, _trailBlank), _leadBlank, -1, _first);
|
|
}
|
|
|
|
/**
|
|
* Calculate indent for partial idententation
|
|
* @return indent space or empty string
|
|
*/
|
|
String indent() {
|
|
if (_trailBlank == -1 || _trailBlank >= _text.length()) {
|
|
return "";
|
|
}
|
|
return _text.substring(_trailBlank);
|
|
}
|
|
|
|
StringSegment indent(String indent, boolean first, boolean last) {
|
|
if (indent.equals("")) {
|
|
return this;
|
|
}
|
|
String reindent = reindent(_text, indent, first, last);
|
|
return new StringSegment(reindent, _first);
|
|
}
|
|
|
|
@Override boolean isStandalone() {
|
|
return false;
|
|
}
|
|
|
|
@Override public void execute (Template tmpl, Template.Context ctx, Writer out) {
|
|
write(out, _text);
|
|
}
|
|
@Override public void decompile (Delims delims, StringBuilder into) {
|
|
into.append(_text);
|
|
}
|
|
@Override public void visit (Visitor visitor) {
|
|
visitor.visitText(_text);
|
|
}
|
|
@Override public String toString () {
|
|
return "Text(" + _text.replace("\r", "\\r").replace("\n", "\\n") + ")" +
|
|
_leadBlank + "/" + _trailBlank;
|
|
}
|
|
|
|
//we indent after every new line for partial indententation
|
|
private static String reindent(String input, String indent, boolean first, boolean last) {
|
|
int length = input.length();
|
|
StringBuilder sb = new StringBuilder(indent.length() + length);
|
|
if (first) {
|
|
sb.append(indent);
|
|
}
|
|
for (int i = 0; i < length; i++) {
|
|
char c = input.charAt(i);
|
|
sb.append(c);
|
|
if (c == '\n' && ( last || i != length - 1) ) {
|
|
sb.append(indent);
|
|
}
|
|
}
|
|
return sb.toString();
|
|
}
|
|
|
|
private static int blankPos (String text, boolean leading, boolean first) {
|
|
int len = text.length();
|
|
for (int ii = leading ? 0 : len-1, ll = leading ? len : -1, dd = leading ? 1 : -1;
|
|
ii != ll; ii += dd) {
|
|
char c = text.charAt(ii);
|
|
if (c == '\n') return leading ? ii : ii+1;
|
|
if (!Character.isWhitespace(c)) return -1;
|
|
}
|
|
// if this is the first string segment and we're looking for trailing whitespace, a
|
|
// totally blank segment (but which lacks a newline) is all trailing whitespace
|
|
return (leading || !first) ? -1 : 0;
|
|
}
|
|
|
|
protected final String _text;
|
|
protected final int _leadBlank, _trailBlank;
|
|
protected final boolean _first;
|
|
}
|
|
|
|
/** A segment that loads and executes a sub-template. */
|
|
protected static class IncludedTemplateSegment extends Template.Segment {
|
|
public IncludedTemplateSegment (Compiler compiler, String name) {
|
|
this(compiler, name, "");
|
|
}
|
|
private IncludedTemplateSegment (Compiler compiler, String name, String indent) {
|
|
_comp = compiler;
|
|
_name = name;
|
|
_indent = indent;
|
|
}
|
|
@Override public void execute (Template tmpl, Template.Context ctx, Writer out) {
|
|
// 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
|
|
getTemplate().executeSegs(ctx, out);
|
|
}
|
|
@Override public void decompile (Delims delims, StringBuilder into) {
|
|
delims.addTag('>', _name, into);
|
|
}
|
|
@Override public void visit (Visitor visitor) {
|
|
if (visitor.visitInclude(_name)) {
|
|
getTemplate().visit(visitor);
|
|
}
|
|
}
|
|
protected Template getTemplate () {
|
|
// we compile our template lazily to avoid infinie recursion if a template includes
|
|
// itself (see issue #13)
|
|
if (_template == null) {
|
|
_template = _comp.loadTemplate(_name).indent(_indent);
|
|
}
|
|
return _template;
|
|
}
|
|
protected IncludedTemplateSegment indent(String indent, boolean first, boolean last) {
|
|
// Indent this partial based on the spacing provided.
|
|
// per the spec however much the partial reference is indendented (leading whitespace)
|
|
// is how much the partial content should be indented.
|
|
if (indent.equals("") || ! _standalone) {
|
|
return this;
|
|
}
|
|
IncludedTemplateSegment is = new IncludedTemplateSegment(_comp, _name, indent + this._indent );
|
|
is._standalone = _standalone;
|
|
return is;
|
|
}
|
|
@Override boolean isStandalone() { return _standalone; }
|
|
|
|
@Override
|
|
public String toString() {
|
|
return "Include(name=" + _name + ", indent=" + _indent + ", standalone=" + _standalone
|
|
+ ")";
|
|
}
|
|
|
|
protected final Compiler _comp;
|
|
protected final String _name;
|
|
private final String _indent;
|
|
private Template _template;
|
|
protected boolean _standalone = false;
|
|
}
|
|
|
|
/** A helper class for named segments. */
|
|
protected static abstract class NamedSegment extends Template.Segment {
|
|
protected NamedSegment (String name, int line) {
|
|
_name = name;
|
|
_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, int line, Formatter formatter, Escaper escaper) {
|
|
super(name, line);
|
|
_formatter = formatter;
|
|
_escaper = escaper;
|
|
}
|
|
@Override public void execute (Template tmpl, Template.Context ctx, Writer out) {
|
|
Object value = tmpl.getValueOrDefault(ctx, _name, _line);
|
|
if (value == null) {
|
|
String msg = Template.isThisName(_name) ?
|
|
"Resolved '.' to null (which is disallowed), on line " + _line :
|
|
"No key, method or field with name '" + _name + "' on line " + _line;
|
|
throw new MustacheException.Context(msg, _name, _line);
|
|
}
|
|
write(out, _escaper.escape(_formatter.format(value)));
|
|
}
|
|
@Override public void decompile (Delims delims, StringBuilder into) {
|
|
delims.addTag(' ', _name, into);
|
|
}
|
|
@Override public void visit (Visitor visitor) {
|
|
visitor.visitVariable(_name);
|
|
}
|
|
@Override
|
|
VariableSegment indent(String indent, boolean first, boolean last) {
|
|
return this;
|
|
}
|
|
@Override
|
|
boolean isStandalone() {
|
|
return false;
|
|
}
|
|
@Override public String toString () {
|
|
return "Var(" + _name + ":" + _line + ")";
|
|
}
|
|
protected final Formatter _formatter;
|
|
protected final Escaper _escaper;
|
|
}
|
|
|
|
/** A helper class for block segments. */
|
|
protected static abstract class BlockSegment extends NamedSegment {
|
|
public boolean firstLeadsBlank () {
|
|
if (_segs.length == 0 || !(_segs[0] instanceof StringSegment)) return false;
|
|
return ((StringSegment)_segs[0]).leadsBlank();
|
|
}
|
|
public void trimFirstBlank () {
|
|
_segs[0] = ((StringSegment)_segs[0]).trimLeadBlank();
|
|
}
|
|
|
|
public boolean lastTrailsBlank () {
|
|
int lastIdx = _segs.length-1;
|
|
if (_segs.length == 0 || !(_segs[lastIdx] instanceof StringSegment)) return false;
|
|
return ((StringSegment)_segs[lastIdx]).trailsBlank();
|
|
}
|
|
public void trimLastBlank () {
|
|
int idx = _segs.length-1;
|
|
_segs[idx] = ((StringSegment)_segs[idx]).trimTrailBlank();
|
|
}
|
|
|
|
protected BlockSegment (String name, Template.Segment[] segs, int line) {
|
|
super(name, line);
|
|
_segs = trim(segs, false);
|
|
}
|
|
protected BlockSegment (BlockSegment original, Template.Segment[] segs) {
|
|
super(original._name, original._line);
|
|
// this call assumes the segments are already trimmed
|
|
_segs = segs;
|
|
}
|
|
|
|
protected void executeSegs (Template tmpl, Template.Context ctx, Writer out) {
|
|
for (Template.Segment seg : _segs) {
|
|
seg.execute(tmpl, ctx, out);
|
|
}
|
|
}
|
|
|
|
protected abstract BlockSegment indent (String indent, boolean first, boolean last);
|
|
|
|
@Override
|
|
boolean isStandalone() {
|
|
return _standaloneEnd;
|
|
}
|
|
boolean isStandaloneStart() {
|
|
return _standaloneStart;
|
|
}
|
|
|
|
protected final Template.Segment[] _segs;
|
|
protected boolean _standaloneStart = false;
|
|
protected boolean _standaloneEnd = false;
|
|
}
|
|
|
|
/** A segment that represents a section. */
|
|
protected static class SectionSegment extends BlockSegment {
|
|
public SectionSegment (Compiler compiler, String name, Template.Segment[] segs, int line) {
|
|
super(name, segs, line);
|
|
_comp = compiler;
|
|
}
|
|
protected SectionSegment(SectionSegment original, Template.Segment[] segs) {
|
|
super(original, segs);
|
|
_comp = original._comp;
|
|
}
|
|
@Override public void execute (Template tmpl, Template.Context ctx, Writer out) {
|
|
Object value = tmpl.getSectionValue(ctx, _name, _line); // won't return null
|
|
Iterator<?> iter = _comp.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 (_comp.isFalsey(value)) {
|
|
// omit the section
|
|
} else {
|
|
executeSegs(tmpl, ctx.nest(value), out);
|
|
}
|
|
}
|
|
@Override public void decompile (Delims delims, StringBuilder into) {
|
|
delims.addTag('#', _name, into);
|
|
for (Template.Segment seg : _segs) seg.decompile(delims, into);
|
|
delims.addTag('/', _name, into);
|
|
}
|
|
@Override public void visit (Visitor visitor) {
|
|
if (visitor.visitSection(_name)) {
|
|
for (Template.Segment seg : _segs) {
|
|
seg.visit(visitor);
|
|
}
|
|
}
|
|
}
|
|
@Override protected SectionSegment indent (String indent, boolean first, boolean last) {
|
|
if (indent.equals("")) {
|
|
return this;
|
|
}
|
|
Template.Segment[] segs = indentSegs(_segs, indent);
|
|
if (segs == _segs) {
|
|
return this;
|
|
}
|
|
return new SectionSegment(this, segs);
|
|
}
|
|
@Override public String toString () {
|
|
return "Section(" + _name + ":" + _line + "): " + Arrays.toString(_segs);
|
|
}
|
|
protected final Compiler _comp;
|
|
}
|
|
|
|
/** A segment that represents an inverted section. */
|
|
protected static class InvertedSegment extends BlockSegment {
|
|
public InvertedSegment (Compiler compiler, String name, Template.Segment[] segs, int line) {
|
|
super(name, segs, line);
|
|
_comp = compiler;
|
|
}
|
|
protected InvertedSegment (InvertedSegment original, Template.Segment[] segs) {
|
|
super(original, segs);
|
|
_comp = original._comp;
|
|
}
|
|
@Override public void execute (Template tmpl, Template.Context ctx, Writer out) {
|
|
Object value = tmpl.getSectionValue(ctx, _name, _line); // won't return null
|
|
Iterator<?> iter = _comp.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);
|
|
}
|
|
} else if (value instanceof InvertibleLambda) {
|
|
try {
|
|
((InvertibleLambda)value).executeInverse(tmpl.createFragment(_segs, ctx), out);
|
|
} catch (IOException ioe) {
|
|
throw new MustacheException(ioe);
|
|
}
|
|
} else if (_comp.isFalsey(value)) {
|
|
executeSegs(tmpl, ctx, out);
|
|
} // TODO: fail?
|
|
}
|
|
@Override public void decompile (Delims delims, StringBuilder into) {
|
|
delims.addTag('^', _name, into);
|
|
for (Template.Segment seg : _segs) seg.decompile(delims, into);
|
|
delims.addTag('/', _name, into);
|
|
}
|
|
@Override public void visit (Visitor visitor) {
|
|
if (visitor.visitInvertedSection(_name)) {
|
|
for (Template.Segment seg : _segs) {
|
|
seg.visit(visitor);
|
|
}
|
|
}
|
|
}
|
|
@Override
|
|
protected InvertedSegment indent (String indent, boolean first, boolean last) {
|
|
if (indent.equals("")) {
|
|
return this;
|
|
}
|
|
Template.Segment[] segs = indentSegs(_segs, indent);
|
|
if (segs == _segs) {
|
|
return this;
|
|
}
|
|
return new InvertedSegment(this, segs);
|
|
}
|
|
@Override public String toString () {
|
|
return "Inverted(" + _name + ":" + _line + "): " + Arrays.toString(_segs);
|
|
}
|
|
protected final Compiler _comp;
|
|
}
|
|
|
|
protected static class FauxSegment extends Template.Segment {
|
|
@Override public void execute (Template tmpl, Template.Context ctx, Writer out) {} // nada
|
|
@Override public void decompile (Delims delims, StringBuilder into) {} // nada
|
|
@Override public void visit (Visitor visit) {}
|
|
@Override FauxSegment indent (String indent, boolean first, boolean last) { return this; }
|
|
@Override boolean isStandalone() { return true; }
|
|
@Override public String toString () { return "Faux"; }
|
|
}
|
|
|
|
/** 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");
|
|
}
|
|
};
|
|
|
|
protected static final Formatter DEFAULT_FORMATTER = new Formatter() {
|
|
public String format (Object value) {
|
|
return String.valueOf(value);
|
|
}
|
|
};
|
|
} |