AfflictionNetworks/jmustache
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Fixed some bugs with newline skipping. Improved error handling when a tag is

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not closed properly and another tag follows it on the same line. Added support
for -first and -last special variables. Fixed problem with resolving outermost
component of a compound key in parent contexts.
This commit is contained in:
Michael Bayne
2010-10-22 05:02:09 +00:00
parent 5932123d79
commit 0b9b01dab6
3 changed files with 90 additions and 29 deletions
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src/main/java/com/samskivert/mustache/Mustache.java
+37 -13
View File
@@ -94,6 +94,7 @@ public class Mustache
// if we just parsed an open section or close section task, we'll skip the first
// newline character following it, if desired; TODO: handle CR, sigh
if (skipNewline) {
skipNewline = false;
continue;
}
} else {
@@ -133,6 +134,7 @@ public class Mustache
if (text.charAt(0) == '=') {
// TODO: change delimiters
} else {
sanityCheckTag(text, line, start1, start2);
accum = accum.addTagSegment(text, line);
skipNewline = accum.skipNewline();
}
@@ -150,6 +152,7 @@ public class Mustache
if (text.charAt(0) == '=') {
// TODO: change delimiters
} else {
sanityCheckTag(text, line, start1, start2);
accum = accum.addTagSegment(text, line);
skipNewline = accum.skipNewline();
}
@@ -187,6 +190,19 @@ public class Mustache
private Mustache () {} // no instantiateski
protected static void sanityCheckTag (StringBuilder accum, int line, char start1, char start2)
{
for (int ii = 0, ll = accum.length(); ii < ll; ii++) {
if (accum.charAt(ii) == start1) {
if (start2 == -1 || (ii < ll-1 && accum.charAt(ii+1) == start2)) {
throw new MustacheException(
"Tag contains start tag delimiter, probably missing close delimiter " +
"[line=" + line + ", tag=" + accum + "]");
}
}
}
}
protected static String escapeHTML (String text)
{
for (int ii = 0; ii < ATTR_ESCAPES.length; ii++) {
@@ -234,7 +250,7 @@ public class Mustache
}
@Override public Template.Segment[] finish () {
throw new MustacheException("Section missing close tag " +
"[line=" + line + ", name=" + tag1 + "]");
"[line=" + line + ", tag=" + tag1 + "]");
}
@Override protected Accumulator addCloseSectionSegment (String itag, int line) {
requireSameName(tag1, itag, line);
@@ -252,7 +268,7 @@ public class Mustache
}
@Override public Template.Segment[] finish () {
throw new MustacheException("Inverted section missing close tag " +
"[line=" + line + ", name=" + tag1 + "]");
"[line=" + line + ", tag=" + tag1 + "]");
}
@Override protected Accumulator addCloseSectionSegment (String itag, int line) {
requireSameName(tag1, itag, line);
@@ -287,13 +303,13 @@ public class Mustache
protected Accumulator addCloseSectionSegment (String tag, int line) {
throw new MustacheException("Section close tag with no open tag " +
"[line=" + line + ", name=" + tag + "]");
"[line=" + line + ", tag=" + tag + "]");
}
protected static void requireNoNewlines (String tag, int line) {
if (tag.indexOf("\n") != -1 || tag.indexOf("\r") != -1) {
throw new MustacheException("Invalid tag name: contains newlne " +
"[line=" + line + ", name=" + tag + "]");
"[line=" + line + ", tag=" + tag + "]");
}
}
@@ -324,7 +340,7 @@ public class Mustache
/** A helper class for named segments. */
protected static abstract class NamedSegment extends Template.Segment {
protected NamedSegment (String name) {
_name = name;
_name = name.intern();
}
protected final String _name;
}
@@ -371,9 +387,12 @@ public class Mustache
return; // TODO: configurable behavior on missing values
}
if (value instanceof Iterable<?>) {
Iterable<?> iable = (Iterable<?>)value;
for (Object elem : iable) {
executeSegs(tmpl, ctx.nest(elem), out);
Template.Mode mode = null;
for (Iterator<?> iter = ((Iterable<?>)value).iterator(); iter.hasNext(); ) {
Object elem = iter.next();
mode = (mode == null) ? Template.Mode.FIRST :
(iter.hasNext() ? Template.Mode.OTHER : Template.Mode.LAST);
executeSegs(tmpl, ctx.nest(elem, mode), out);
}
} else if (value instanceof Boolean) {
if ((Boolean)value) {
@@ -381,15 +400,20 @@ public class Mustache
}
} else if (value.getClass().isArray()) {
for (int ii = 0, ll = Array.getLength(value); ii < ll; ii++) {
executeSegs(tmpl, ctx.nest(Array.get(value, ii)), out);
Template.Mode mode = (ii == 0) ? Template.Mode.FIRST :
((ii == ll-1) ? Template.Mode.LAST : Template.Mode.OTHER);
executeSegs(tmpl, ctx.nest(Array.get(value, ii), mode), out);
}
} else if (value instanceof Iterator<?>) {
Iterator<?> iter = (Iterator<?>)value;
while (iter.hasNext()) {
executeSegs(tmpl, ctx.nest(iter.next()), out);
Template.Mode mode = null;
for (Iterator<?> iter = (Iterator<?>)value; iter.hasNext(); ) {
Object elem = iter.next();
mode = (mode == null) ? Template.Mode.FIRST :
(iter.hasNext() ? Template.Mode.OTHER : Template.Mode.LAST);
executeSegs(tmpl, ctx.nest(elem, mode), out);
}
} else {
executeSegs(tmpl, ctx.nest(value), out);
executeSegs(tmpl, ctx.nest(value, Template.Mode.OTHER), out);
}
}
}
src/main/java/com/samskivert/mustache/Template.java
+43 -16
View File
@@ -42,7 +42,7 @@ public class Template
*/
public void execute (Object context, Writer out) throws MustacheException
{
Context ctx = new Context(context, null);
Context ctx = new Context(context, null, Mode.OTHER);
for (Segment seg : _segs) {
seg.execute(this, ctx, out);
}
@@ -67,9 +67,41 @@ public class Template
/**
* Called by executing segments to obtain the value of the specified variable in the supplied
* context.
*
* @param ctx the context in which to look up the variable.
* @param name the name of the variable to be resolved, which must be an interned string.
*/
protected Object getValue (Context ctx, String name)
{
// if we're dealing with a compound key, resolve each component and use the result to
// resolve the subsequent component and so forth
if (name.indexOf(".") != -1) {
String[] comps = name.split("\\.");
// we want to allow the first component of a compound key to be located in a parent
// context, but once we're selecting sub-components, they must only be resolved in the
// object that represents that component
Object data = getValue(ctx, comps[0].intern());
for (int ii = 1; ii < comps.length; ii++) {
// generate more helpful error message
if (data == null) {
throw new NullPointerException(
"Null context for compound variable '" + name + "'. " +
"The component previous to '" + comps[ii] + "' resolved to null.");
}
// once we step into a composite key, we drop the ability to query our parent
// contexts; that would be weird and confusing
data = getValueIn(data, comps[ii].intern());
}
return data;
}
// handle our special variables
if (name == FIRST_NAME) {
return ctx.mode == Mode.FIRST;
} else if (name == LAST_NAME) {
return ctx.mode == Mode.LAST;
}
while (ctx != null) {
Object value = getValueIn(ctx.data, name);
if (value != null) {
@@ -87,17 +119,6 @@ public class Template
throw new NullPointerException("Null context for variable '" + name + "'");
}
// if we're dealing with a composite key, resolve each component and use the result to
// resolve the subsequent component and so forth
if (name.indexOf(".") != -1) {
for (String comp : name.split("\\.")) {
// once we step into a composite key, we drop the ability to query our parent
// contexts; that would be weird and confusing
data = getValueIn(data, comp);
}
return data;
}
Key key = new Key(data.getClass(), name);
VariableFetcher fetcher = _fcache.get(key);
if (fetcher != null) {
@@ -215,18 +236,22 @@ public class Template
return null;
}
protected static enum Mode { FIRST, OTHER, LAST };
protected static class Context
{
public final Object data;
public final Context parent;
public final Mode mode;
public Context (Object data, Context parent) {
public Context (Object data, Context parent, Mode mode) {
this.data = data;
this.parent = parent;
this.mode = mode;
}
public Context nest (Object data) {
return new Context(data, this);
public Context nest (Object data, Mode mode) {
return new Context(data, this, mode);
}
}
@@ -252,7 +277,7 @@ public class Template
public Key (Class<?> cclass, String name) {
this.cclass = cclass;
this.name = name.intern();
this.name = name;
}
@Override public int hashCode () {
@@ -282,4 +307,6 @@ public class Template
};
protected static final String THIS_NAME = "this".intern();
protected static final String FIRST_NAME = "-first".intern();
protected static final String LAST_NAME = "-last".intern();
}