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* Added a few public API methods to JavaScriptCompiler.prototype, so it can be subclassed.

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* made it possible to define an alternate name lookup scheme (so that {{foo}} does not have to be
    context.foo, but can instead be something like context.get('foo'))
  * made it possible to substitute an alternate buffer instead of the default empty String and override how
    the compiled template appends to the buffer
* Added the concept of template-local data. In order to enable template-local data, pass true
  as the second parameter to the template compiler. Then, pass in the data as the fourth
  parameter (context, helpers, partials, data). These signatures may change before the 1.0 release.
This commit is contained in:
tomhuda
2011-02-11 17:02:26 -08:00
parent 2eb1b30870
commit 88e7003331
4 changed files with 125 additions and 38 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lib/handlebars/base.js
+2 -1
View File
@@ -106,10 +106,11 @@ Handlebars.logger = {
// override in the host environment
log: function(level, str) {}
}
};
Handlebars.log = function(level, str) { Handlebars.logger.log(level, str); };
// END(BROWSER)
module.exports = Handlebars;
lib/handlebars/vm.js
+54 -33
View File
@@ -246,8 +246,28 @@ Handlebars.JavaScriptCompiler = function() {};
};
JavaScriptCompiler.prototype = {
compile: function(environment) {
// PUBLIC API: You can override these methods in a subclass to provide
// alternative compiled forms for name lookup and buffering semantics
nameLookup: function(parent, name, type) {
if(JavaScriptCompiler.RESERVED_WORDS[name]) {
return parent + "['" + name + "']";
} else {
return parent + "." + name;
}
},
appendToBuffer: function(string) {
return "buffer = buffer + " + string + ";";
},
initializeBuffer: function() {
return this.quotedString("");
},
// END PUBLIC API
compile: function(environment, data) {
this.environment = environment;
this.data = data;
this.preamble();
@@ -255,7 +275,7 @@ Handlebars.JavaScriptCompiler = function() {};
this.stackVars = [];
this.registers = {list: []};
this.compileChildren(environment);
this.compileChildren(environment, data);
Handlebars.log(Handlebars.logger.DEBUG, environment.disassemble() + "\n\n");
@@ -306,7 +326,7 @@ Handlebars.JavaScriptCompiler = function() {};
preamble: function() {
var out = [];
out.push("var buffer = '', currentContext = context");
out.push("var buffer = " + this.initializeBuffer() + ", currentContext = context");
var copies = "helpers = helpers || Handlebars.helpers;";
if(this.environment.usePartial) { copies = copies + " partials = partials || Handlebars.partials;"; }
@@ -323,9 +343,11 @@ Handlebars.JavaScriptCompiler = function() {};
escapeExpression: Handlebars.Utils.escapeExpression,
invokePartial: Handlebars.VM.invokePartial,
programs: [],
program: function(i, helpers, partials) {
program: function(i, helpers, partials, data) {
var programWrapper = this.programs[i];
if(programWrapper) {
if(data) {
return Handlebars.VM.program(this.children[i], helpers, partials, data);
} else if(programWrapper) {
return programWrapper;
} else {
programWrapper = this.programs[i] = Handlebars.VM.program(this.children[i], helpers, partials);
@@ -347,11 +369,14 @@ Handlebars.JavaScriptCompiler = function() {};
var params = ["Handlebars", "context", "helpers", "partials"];
if(this.data) { params.push("data"); }
for(var i=0, l=this.environment.depths.list.length; i<l; i++) {
params.push("depth" + this.environment.depths.list[i]);
}
if(params.length === 3 && !this.environment.usePartial) { params.pop(); }
if(params.length === 4 && !this.environment.usePartial) { params.pop(); }
params.push(this.source.join("\n"));
@@ -364,9 +389,11 @@ Handlebars.JavaScriptCompiler = function() {};
container.children = this.environment.children;
return function(context, helpers, partials, depth) {
return function(context, helpers, partials, data, $depth) {
try {
return container.render.call(container, Handlebars, context, helpers, partials, depth);
var args = Array.prototype.slice.call(arguments);
args.unshift(Handlebars);
return container.render.apply(container, args);
} catch(e) {
throw e;
}
@@ -374,12 +401,12 @@ Handlebars.JavaScriptCompiler = function() {};
},
appendContent: function(content) {
this.source.push("buffer = buffer + " + this.quotedString(content) + ";");
this.source.push(this.appendToBuffer(this.quotedString(content)));
},
append: function() {
var local = this.popStack();
this.source.push("if(" + local + " || " + local + " === 0) { buffer = buffer + " + local + "; }");
this.source.push("if(" + local + " || " + local + " === 0) { " + this.appendToBuffer(local) + " }");
},
appendEscaped: function() {
@@ -390,7 +417,7 @@ Handlebars.JavaScriptCompiler = function() {};
this.eat(opcode);
}
this.source.push("buffer = buffer + this.escapeExpression(" + this.popStack() + ")" + extra + ";");
this.source.push(this.appendToBuffer("this.escapeExpression(" + this.popStack() + ")" + extra));
},
getContext: function(depth) {
@@ -405,19 +432,11 @@ Handlebars.JavaScriptCompiler = function() {};
}
},
nameLookup: function(parent, name) {
if(JavaScriptCompiler.RESERVED_WORDS[name]) {
return parent + "['" + name + "']";
} else {
return parent + "." + name;
}
},
lookupWithFallback: function(name) {
if(name) {
this.pushStack(this.nameLookup('currentContext', name));
this.pushStack(this.nameLookup('currentContext', name, 'context'));
var topStack = this.topStack();
this.source.push("if(" + topStack + " === undefined) { " + topStack + " = " + this.nameLookup('helpers', name) + "; }");
this.source.push("if(" + topStack + " === undefined) { " + topStack + " = " + this.nameLookup('helpers', name, 'helper') + "; }");
} else {
this.pushStack("currentContext");
}
@@ -425,7 +444,7 @@ Handlebars.JavaScriptCompiler = function() {};
lookup: function(name) {
var topStack = this.topStack();
this.source.push(topStack + " = " + this.nameLookup(topStack, name) + ";");
this.source.push(topStack + " = " + this.nameLookup(topStack, name, 'context') + ";");
},
pushString: function(string) {
@@ -445,6 +464,8 @@ Handlebars.JavaScriptCompiler = function() {};
params.push(this.popStack());
}
if(this.data) { params.push("data"); }
var paramString = params.join(", ");
var helperMissing = ["context"].concat(this.quotedString(original)).concat(params.slice(1));
@@ -492,12 +513,12 @@ Handlebars.JavaScriptCompiler = function() {};
},
invokePartial: function(context) {
this.pushStack("this.invokePartial(" + this.nameLookup('partials', context) + ", '" + context + "', " + this.popStack() + ", helpers, partials);");
this.pushStack("this.invokePartial(" + this.nameLookup('partials', context, 'partial') + ", '" + context + "', " + this.popStack() + ", helpers, partials);");
},
// HELPERS
compileChildren: function(environment) {
compileChildren: function(environment, data) {
var children = environment.children, child, compiler;
var compiled = [];
@@ -505,7 +526,7 @@ Handlebars.JavaScriptCompiler = function() {};
child = children[i];
compiler = new JavaScriptCompiler();
compiled[i] = compiler.compile(child);
compiled[i] = compiler.compile(child, data);
}
environment.rawChildren = children;
@@ -519,6 +540,8 @@ Handlebars.JavaScriptCompiler = function() {};
var depths = this.environment.rawChildren[guid].depths.list;
if(this.data) { programParams.push("data"); }
for(var i=0, l = depths.length; i<l; i++) {
depth = depths[i];
@@ -540,8 +563,6 @@ Handlebars.JavaScriptCompiler = function() {};
programParams[0] = "this.children[" + guid + "]";
return "this.programWithDepth(" + programParams.join(", ") + ")";
}
return "this.program(" + programParams.join(", ") + ")";
},
register: function(name, val) {
@@ -597,22 +618,22 @@ Handlebars.JavaScriptCompiler = function() {};
})(Handlebars.Compiler, Handlebars.JavaScriptCompiler);
Handlebars.VM = {
programWithDepth: function(fn, helpers, partials, depth) {
var args = [].slice.call(arguments, 1);
programWithDepth: function(fn) {
var args = Array.prototype.slice.call(arguments, 1);
return function(context) {
return fn.apply(this, [context].concat(args));
};
},
program: function(fn, helpers, partials) {
program: function(fn, helpers, partials, data) {
return function(context) {
return fn(context, helpers, partials);
return fn(context, helpers, partials, data);
};
},
noop: function() { return ""; },
compile: function(string) {
compile: function(string, data) {
var ast = Handlebars.parse(string);
var environment = new Handlebars.Compiler().compile(ast);
return new Handlebars.JavaScriptCompiler().compile(environment);
return new Handlebars.JavaScriptCompiler().compile(environment, data);
},
invokePartial: function(partial, name, context, helpers, partials) {
if(partial === undefined) {
spec/qunit_spec.js
+66 -1
View File
@@ -20,7 +20,7 @@ var shouldCompileTo = function(string, hash, expected, message) {
result = template.apply(this, hash)
equal(result, expected, "'" + expected + "' should === '" + result + "': " + message);
}
};
var shouldThrow = function(fn, exception, message) {
var caught = false;
@@ -519,3 +519,68 @@ test("each", function() {
shouldCompileTo(string, {goodbyes: [], world: "world"}, "cruel world!",
"each with array argument ignores the contents when empty");
});
test("overriding property lookup", function() {
});
test("passing in data to a compiled function that expects data - works with helpers", function() {
var template = Handlebars.compile("{{hello}}", true);
var helpers = {
hello: function(data) {
return data.adjective + " " + this.noun;
}
};
var result = template({noun: "cat"}, helpers, null, {adjective: "happy"});
equals("happy cat", result);
});
test("passing in data to a compiled function that expects data - works with helpers and parameters", function() {
var template = Handlebars.compile("{{hello world}}", true);
var helpers = {
hello: function(noun, data) {
return data.adjective + " " + noun + (this.exclaim ? "!" : "");
}
};
var result = template({exclaim: true, world: "world"}, helpers, null, {adjective: "happy"});
equals("happy world!", result);
});
test("passing in data to a compiled function that expects data - works with block helpers", function() {
var template = Handlebars.compile("{{#hello}}{{world}}{{/hello}}", true);
var helpers = {
hello: function(fn) {
return fn(this);
},
world: function(data) {
return data.adjective + " world" + (this.exclaim ? "!" : "");
}
};
var result = template({exclaim: true}, helpers, null, {adjective: "happy"});
equals("happy world!", result);
});
test("passing in data to a compiled function that expects data - works with block helpers that use ..", function() {
var template = Handlebars.compile("{{#hello}}{{world ../zomg}}{{/hello}}", true);
var helpers = {
hello: function(fn) {
return fn({exclaim: "?"});
},
world: function(thing, data) {
return data.adjective + " " + thing + (this.exclaim || "");
}
};
var result = template({exclaim: true, zomg: "world"}, helpers, null, {adjective: "happy"});
equals("happy world?", result);
});
spec/spec_helper.rb
+1 -1
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@@ -85,7 +85,7 @@ module Handlebars
context["Handlebars"]["logger"]["level"] = ENV["DEBUG_JS"] ? context["Handlebars"]["logger"][ENV["DEBUG_JS"]] : 4
context["Handlebars"]["logger"]["log"] = proc do |level, str|
logger_level = context["Handlebars"]["logger"]["level"]
logger_level = context["Handlebars"]["logger"]["level"].to_i
if logger_level <= level
puts str