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3716
1 | "use strict";
var COMPILER_REVISION = require("../base").COMPILER_REVISION;
var REVISION_CHANGES = require("../base").REVISION_CHANGES;
var Exception = require("../exception")["default"];
function Literal(value) {
this.value = value;
}
function JavaScriptCompiler() {}
JavaScriptCompiler.prototype = {
// 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.isValidJavaScriptVariableName(name)) {
return parent + "." + name;
} else {
return parent + "['" + name + "']";
}
},
depthedLookup: function(name) {
this.aliases.lookup = 'this.lookup';
return 'lookup(depths, "' + name + '")';
},
compilerInfo: function() {
var revision = COMPILER_REVISION,
versions = REVISION_CHANGES[revision];
return [revision, versions];
},
appendToBuffer: function(string) {
if (this.environment.isSimple) {
return "return " + string + ";";
} else {
return {
appendToBuffer: true,
content: string,
toString: function() { return "buffer += " + string + ";"; }
};
}
},
initializeBuffer: function() {
return this.quotedString("");
},
namespace: "Handlebars",
// END PUBLIC API
compile: function(environment, options, context, asObject) {
this.environment = environment;
this.options = options;
this.stringParams = this.options.stringParams;
this.trackIds = this.options.trackIds;
this.precompile = !asObject;
this.name = this.environment.name;
this.isChild = !!context;
this.context = context || {
programs: [],
environments: []
};
this.preamble();
this.stackSlot = 0;
this.stackVars = [];
this.aliases = {};
this.registers = { list: [] };
this.hashes = [];
this.compileStack = [];
this.inlineStack = [];
this.compileChildren(environment, options);
this.useDepths = this.useDepths || environment.depths.list.length || this.options.compat;
var opcodes = environment.opcodes,
opcode,
i,
l;
for (i = 0, l = opcodes.length; i < l; i++) {
opcode = opcodes[i];
this[opcode.opcode].apply(this, opcode.args);
}
// Flush any trailing content that might be pending.
this.pushSource('');
/* istanbul ignore next */
Iif (this.stackSlot || this.inlineStack.length || this.compileStack.length) {
throw new Exception('Compile completed with content left on stack');
}
var fn = this.createFunctionContext(asObject);
if (!this.isChild) {
var ret = {
compiler: this.compilerInfo(),
main: fn
};
var programs = this.context.programs;
for (i = 0, l = programs.length; i < l; i++) {
if (programs[i]) {
ret[i] = programs[i];
}
}
if (this.environment.usePartial) {
ret.usePartial = true;
}
if (this.options.data) {
ret.useData = true;
}
if (this.useDepths) {
ret.useDepths = true;
}
if (this.options.compat) {
ret.compat = true;
}
if (!asObject) {
ret.compiler = JSON.stringify(ret.compiler);
ret = this.objectLiteral(ret);
}
return ret;
} else {
return fn;
}
},
preamble: function() {
// track the last context pushed into place to allow skipping the
// getContext opcode when it would be a noop
this.lastContext = 0;
this.source = [];
},
createFunctionContext: function(asObject) {
var varDeclarations = '';
var locals = this.stackVars.concat(this.registers.list);
if(locals.length > 0) {
varDeclarations += ", " + locals.join(", ");
}
// Generate minimizer alias mappings
for (var alias in this.aliases) {
if (this.aliases.hasOwnProperty(alias)) {
varDeclarations += ', ' + alias + '=' + this.aliases[alias];
}
}
var params = ["depth0", "helpers", "partials", "data"];
if (this.useDepths) {
params.push('depths');
}
// Perform a second pass over the output to merge content when possible
var source = this.mergeSource(varDeclarations);
if (asObject) {
params.push(source);
return Function.apply(this, params);
} else {
return 'function(' + params.join(',') + ') {\n ' + source + '}';
}
},
mergeSource: function(varDeclarations) {
var source = '',
buffer,
appendOnly = !this.forceBuffer,
appendFirst;
for (var i = 0, len = this.source.length; i < len; i++) {
var line = this.source[i];
if (line.appendToBuffer) {
if (buffer) {
buffer = buffer + '\n + ' + line.content;
} else {
buffer = line.content;
}
} else {
if (buffer) {
if (!source) {
appendFirst = true;
source = buffer + ';\n ';
} else {
source += 'buffer += ' + buffer + ';\n ';
}
buffer = undefined;
}
source += line + '\n ';
if (!this.environment.isSimple) {
appendOnly = false;
}
}
}
if (appendOnly) {
if (buffer || !source) {
source += 'return ' + (buffer || '""') + ';\n';
}
} else {
varDeclarations += ", buffer = " + (appendFirst ? '' : this.initializeBuffer());
if (buffer) {
source += 'return buffer + ' + buffer + ';\n';
} else {
source += 'return buffer;\n';
}
}
if (varDeclarations) {
source = 'var ' + varDeclarations.substring(2) + (appendFirst ? '' : ';\n ') + source;
}
return source;
},
// [blockValue]
//
// On stack, before: hash, inverse, program, value
// On stack, after: return value of blockHelperMissing
//
// The purpose of this opcode is to take a block of the form
// `{{#this.foo}}...{{/this.foo}}`, resolve the value of `foo`, and
// replace it on the stack with the result of properly
// invoking blockHelperMissing.
blockValue: function(name) {
this.aliases.blockHelperMissing = 'helpers.blockHelperMissing';
var params = [this.contextName(0)];
this.setupParams(name, 0, params);
var blockName = this.popStack();
params.splice(1, 0, blockName);
this.push('blockHelperMissing.call(' + params.join(', ') + ')');
},
// [ambiguousBlockValue]
//
// On stack, before: hash, inverse, program, value
// Compiler value, before: lastHelper=value of last found helper, if any
// On stack, after, if no lastHelper: same as [blockValue]
// On stack, after, if lastHelper: value
ambiguousBlockValue: function() {
this.aliases.blockHelperMissing = 'helpers.blockHelperMissing';
// We're being a bit cheeky and reusing the options value from the prior exec
var params = [this.contextName(0)];
this.setupParams('', 0, params, true);
this.flushInline();
var current = this.topStack();
params.splice(1, 0, current);
this.pushSource("if (!" + this.lastHelper + ") { " + current + " = blockHelperMissing.call(" + params.join(", ") + "); }");
},
// [appendContent]
//
// On stack, before: ...
// On stack, after: ...
//
// Appends the string value of `content` to the current buffer
appendContent: function(content) {
if (this.pendingContent) {
content = this.pendingContent + content;
}
this.pendingContent = content;
},
// [append]
//
// On stack, before: value, ...
// On stack, after: ...
//
// Coerces `value` to a String and appends it to the current buffer.
//
// If `value` is truthy, or 0, it is coerced into a string and appended
// Otherwise, the empty string is appended
append: function() {
// Force anything that is inlined onto the stack so we don't have duplication
// when we examine local
this.flushInline();
var local = this.popStack();
this.pushSource('if (' + local + ' != null) { ' + this.appendToBuffer(local) + ' }');
if (this.environment.isSimple) {
this.pushSource("else { " + this.appendToBuffer("''") + " }");
}
},
// [appendEscaped]
//
// On stack, before: value, ...
// On stack, after: ...
//
// Escape `value` and append it to the buffer
appendEscaped: function() {
this.aliases.escapeExpression = 'this.escapeExpression';
this.pushSource(this.appendToBuffer("escapeExpression(" + this.popStack() + ")"));
},
// [getContext]
//
// On stack, before: ...
// On stack, after: ...
// Compiler value, after: lastContext=depth
//
// Set the value of the `lastContext` compiler value to the depth
getContext: function(depth) {
this.lastContext = depth;
},
// [pushContext]
//
// On stack, before: ...
// On stack, after: currentContext, ...
//
// Pushes the value of the current context onto the stack.
pushContext: function() {
this.pushStackLiteral(this.contextName(this.lastContext));
},
// [lookupOnContext]
//
// On stack, before: ...
// On stack, after: currentContext[name], ...
//
// Looks up the value of `name` on the current context and pushes
// it onto the stack.
lookupOnContext: function(parts, falsy, scoped) {
/*jshint -W083 */
var i = 0,
len = parts.length;
if (!scoped && this.options.compat && !this.lastContext) {
// The depthed query is expected to handle the undefined logic for the root level that
// is implemented below, so we evaluate that directly in compat mode
this.push(this.depthedLookup(parts[i++]));
} else {
this.pushContext();
}
for (; i < len; i++) {
this.replaceStack(function(current) {
var lookup = this.nameLookup(current, parts[i], 'context');
// We want to ensure that zero and false are handled properly if the context (falsy flag)
// needs to have the special handling for these values.
if (!falsy) {
return ' != null ? ' + lookup + ' : ' + current;
} else {
// Otherwise we can use generic falsy handling
return ' && ' + lookup;
}
});
}
},
// [lookupData]
//
// On stack, before: ...
// On stack, after: data, ...
//
// Push the data lookup operator
lookupData: function(depth, parts) {
/*jshint -W083 */
if (!depth) {
this.pushStackLiteral('data');
} else {
this.pushStackLiteral('this.data(data, ' + depth + ')');
}
var len = parts.length;
for (var i = 0; i < len; i++) {
this.replaceStack(function(current) {
return ' && ' + this.nameLookup(current, parts[i], 'data');
});
}
},
// [resolvePossibleLambda]
//
// On stack, before: value, ...
// On stack, after: resolved value, ...
//
// If the `value` is a lambda, replace it on the stack by
// the return value of the lambda
resolvePossibleLambda: function() {
this.aliases.lambda = 'this.lambda';
this.push('lambda(' + this.popStack() + ', ' + this.contextName(0) + ')');
},
// [pushStringParam]
//
// On stack, before: ...
// On stack, after: string, currentContext, ...
//
// This opcode is designed for use in string mode, which
// provides the string value of a parameter along with its
// depth rather than resolving it immediately.
pushStringParam: function(string, type) {
this.pushContext();
this.pushString(type);
// If it's a subexpression, the string result
// will be pushed after this opcode.
if (type !== 'sexpr') {
if (typeof string === 'string') {
this.pushString(string);
} else {
this.pushStackLiteral(string);
}
}
},
emptyHash: function() {
this.pushStackLiteral('{}');
if (this.trackIds) {
this.push('{}'); // hashIds
}
if (this.stringParams) {
this.push('{}'); // hashContexts
this.push('{}'); // hashTypes
}
},
pushHash: function() {
if (this.hash) {
this.hashes.push(this.hash);
}
this.hash = {values: [], types: [], contexts: [], ids: []};
},
popHash: function() {
var hash = this.hash;
this.hash = this.hashes.pop();
if (this.trackIds) {
this.push('{' + hash.ids.join(',') + '}');
}
if (this.stringParams) {
this.push('{' + hash.contexts.join(',') + '}');
this.push('{' + hash.types.join(',') + '}');
}
this.push('{\n ' + hash.values.join(',\n ') + '\n }');
},
// [pushString]
//
// On stack, before: ...
// On stack, after: quotedString(string), ...
//
// Push a quoted version of `string` onto the stack
pushString: function(string) {
this.pushStackLiteral(this.quotedString(string));
},
// [push]
//
// On stack, before: ...
// On stack, after: expr, ...
//
// Push an expression onto the stack
push: function(expr) {
this.inlineStack.push(expr);
return expr;
},
// [pushLiteral]
//
// On stack, before: ...
// On stack, after: value, ...
//
// Pushes a value onto the stack. This operation prevents
// the compiler from creating a temporary variable to hold
// it.
pushLiteral: function(value) {
this.pushStackLiteral(value);
},
// [pushProgram]
//
// On stack, before: ...
// On stack, after: program(guid), ...
//
// Push a program expression onto the stack. This takes
// a compile-time guid and converts it into a runtime-accessible
// expression.
pushProgram: function(guid) {
if (guid != null) {
this.pushStackLiteral(this.programExpression(guid));
} else {
this.pushStackLiteral(null);
}
},
// [invokeHelper]
//
// On stack, before: hash, inverse, program, params..., ...
// On stack, after: result of helper invocation
//
// Pops off the helper's parameters, invokes the helper,
// and pushes the helper's return value onto the stack.
//
// If the helper is not found, `helperMissing` is called.
invokeHelper: function(paramSize, name, isSimple) {
this.aliases.helperMissing = 'helpers.helperMissing';
var nonHelper = this.popStack();
var helper = this.setupHelper(paramSize, name);
var lookup = (isSimple ? helper.name + ' || ' : '') + nonHelper + ' || helperMissing';
this.push('((' + lookup + ').call(' + helper.callParams + '))');
},
// [invokeKnownHelper]
//
// On stack, before: hash, inverse, program, params..., ...
// On stack, after: result of helper invocation
//
// This operation is used when the helper is known to exist,
// so a `helperMissing` fallback is not required.
invokeKnownHelper: function(paramSize, name) {
var helper = this.setupHelper(paramSize, name);
this.push(helper.name + ".call(" + helper.callParams + ")");
},
// [invokeAmbiguous]
//
// On stack, before: hash, inverse, program, params..., ...
// On stack, after: result of disambiguation
//
// This operation is used when an expression like `{{foo}}`
// is provided, but we don't know at compile-time whether it
// is a helper or a path.
//
// This operation emits more code than the other options,
// and can be avoided by passing the `knownHelpers` and
// `knownHelpersOnly` flags at compile-time.
invokeAmbiguous: function(name, helperCall) {
this.aliases.functionType = '"function"';
this.aliases.helperMissing = 'helpers.helperMissing';
this.useRegister('helper');
var nonHelper = this.popStack();
this.emptyHash();
var helper = this.setupHelper(0, name, helperCall);
var helperName = this.lastHelper = this.nameLookup('helpers', name, 'helper');
this.push(
'((helper = (helper = ' + helperName + ' || ' + nonHelper + ') != null ? helper : helperMissing'
+ (helper.paramsInit ? '),(' + helper.paramsInit : '') + '),'
+ '(typeof helper === functionType ? helper.call(' + helper.callParams + ') : helper))');
},
// [invokePartial]
//
// On stack, before: context, ...
// On stack after: result of partial invocation
//
// This operation pops off a context, invokes a partial with that context,
// and pushes the result of the invocation back.
invokePartial: function(name, indent) {
var params = [this.nameLookup('partials', name, 'partial'), "'" + indent + "'", "'" + name + "'", this.popStack(), this.popStack(), "helpers", "partials"];
if (this.options.data) {
params.push("data");
} else if (this.options.compat) {
params.push('undefined');
}
if (this.options.compat) {
params.push('depths');
}
this.push("this.invokePartial(" + params.join(", ") + ")");
},
// [assignToHash]
//
// On stack, before: value, ..., hash, ...
// On stack, after: ..., hash, ...
//
// Pops a value off the stack and assigns it to the current hash
assignToHash: function(key) {
var value = this.popStack(),
context,
type,
id;
if (this.trackIds) {
id = this.popStack();
}
if (this.stringParams) {
type = this.popStack();
context = this.popStack();
}
var hash = this.hash;
if (context) {
hash.contexts.push("'" + key + "': " + context);
}
if (type) {
hash.types.push("'" + key + "': " + type);
}
if (id) {
hash.ids.push("'" + key + "': " + id);
}
hash.values.push("'" + key + "': (" + value + ")");
},
pushId: function(type, name) {
if (type === 'ID' || type === 'DATA') {
this.pushString(name);
} else if (type === 'sexpr') {
this.pushStackLiteral('true');
} else {
this.pushStackLiteral('null');
}
},
// HELPERS
compiler: JavaScriptCompiler,
compileChildren: function(environment, options) {
var children = environment.children, child, compiler;
for(var i=0, l=children.length; i<l; i++) {
child = children[i];
compiler = new this.compiler();
var index = this.matchExistingProgram(child);
if (index == null) {
this.context.programs.push(''); // Placeholder to prevent name conflicts for nested children
index = this.context.programs.length;
child.index = index;
child.name = 'program' + index;
this.context.programs[index] = compiler.compile(child, options, this.context, !this.precompile);
this.context.environments[index] = child;
this.useDepths = this.useDepths || compiler.useDepths;
} else {
child.index = index;
child.name = 'program' + index;
}
}
},
matchExistingProgram: function(child) {
for (var i = 0, len = this.context.environments.length; i < len; i++) {
var environment = this.context.environments[i];
if (environment && environment.equals(child)) {
return i;
}
}
},
programExpression: function(guid) {
var child = this.environment.children[guid],
depths = child.depths.list,
useDepths = this.useDepths,
depth;
var programParams = [child.index, 'data'];
if (useDepths) {
programParams.push('depths');
}
return 'this.program(' + programParams.join(', ') + ')';
},
useRegister: function(name) {
if(!this.registers[name]) {
this.registers[name] = true;
this.registers.list.push(name);
}
},
pushStackLiteral: function(item) {
return this.push(new Literal(item));
},
pushSource: function(source) {
if (this.pendingContent) {
this.source.push(this.appendToBuffer(this.quotedString(this.pendingContent)));
this.pendingContent = undefined;
}
if (source) {
this.source.push(source);
}
},
pushStack: function(item) {
this.flushInline();
var stack = this.incrStack();
this.pushSource(stack + " = " + item + ";");
this.compileStack.push(stack);
return stack;
},
replaceStack: function(callback) {
var prefix = '',
inline = this.isInline(),
stack,
createdStack,
usedLiteral;
/* istanbul ignore next */
Iif (!this.isInline()) {
throw new Exception('replaceStack on non-inline');
}
// We want to merge the inline statement into the replacement statement via ','
var top = this.popStack(true);
if (top instanceof Literal) {
// Literals do not need to be inlined
prefix = stack = top.value;
usedLiteral = true;
} else {
// Get or create the current stack name for use by the inline
createdStack = !this.stackSlot;
var name = !createdStack ? this.topStackName() : this.incrStack();
prefix = '(' + this.push(name) + ' = ' + top + ')';
stack = this.topStack();
}
var item = callback.call(this, stack);
if (!usedLiteral) {
this.popStack();
}
if (createdStack) {
this.stackSlot--;
}
this.push('(' + prefix + item + ')');
},
incrStack: function() {
this.stackSlot++;
if(this.stackSlot > this.stackVars.length) { this.stackVars.push("stack" + this.stackSlot); }
return this.topStackName();
},
topStackName: function() {
return "stack" + this.stackSlot;
},
flushInline: function() {
var inlineStack = this.inlineStack;
if (inlineStack.length) {
this.inlineStack = [];
for (var i = 0, len = inlineStack.length; i < len; i++) {
var entry = inlineStack[i];
Iif (entry instanceof Literal) {
this.compileStack.push(entry);
} else {
this.pushStack(entry);
}
}
}
},
isInline: function() {
return this.inlineStack.length;
},
popStack: function(wrapped) {
var inline = this.isInline(),
item = (inline ? this.inlineStack : this.compileStack).pop();
if (!wrapped && (item instanceof Literal)) {
return item.value;
} else {
if (!inline) {
/* istanbul ignore next */
Iif (!this.stackSlot) {
throw new Exception('Invalid stack pop');
}
this.stackSlot--;
}
return item;
}
},
topStack: function() {
var stack = (this.isInline() ? this.inlineStack : this.compileStack),
item = stack[stack.length - 1];
Iif (item instanceof Literal) {
return item.value;
} else {
return item;
}
},
contextName: function(context) {
if (this.useDepths && context) {
return 'depths[' + context + ']';
} else {
return 'depth' + context;
}
},
quotedString: function(str) {
return '"' + str
.replace(/\\/g, '\\\\')
.replace(/"/g, '\\"')
.replace(/\n/g, '\\n')
.replace(/\r/g, '\\r')
.replace(/\u2028/g, '\\u2028') // Per Ecma-262 7.3 + 7.8.4
.replace(/\u2029/g, '\\u2029') + '"';
},
objectLiteral: function(obj) {
var pairs = [];
for (var key in obj) {
if (obj.hasOwnProperty(key)) {
pairs.push(this.quotedString(key) + ':' + obj[key]);
}
}
return '{' + pairs.join(',') + '}';
},
setupHelper: function(paramSize, name, blockHelper) {
var params = [],
paramsInit = this.setupParams(name, paramSize, params, blockHelper);
var foundHelper = this.nameLookup('helpers', name, 'helper');
return {
params: params,
paramsInit: paramsInit,
name: foundHelper,
callParams: [this.contextName(0)].concat(params).join(", ")
};
},
setupOptions: function(helper, paramSize, params) {
var options = {}, contexts = [], types = [], ids = [], param, inverse, program;
options.name = this.quotedString(helper);
options.hash = this.popStack();
if (this.trackIds) {
options.hashIds = this.popStack();
}
if (this.stringParams) {
options.hashTypes = this.popStack();
options.hashContexts = this.popStack();
}
inverse = this.popStack();
program = this.popStack();
// Avoid setting fn and inverse if neither are set. This allows
// helpers to do a check for `if (options.fn)`
if (program || inverse) {
if (!program) {
program = 'this.noop';
}
if (!inverse) {
inverse = 'this.noop';
}
options.fn = program;
options.inverse = inverse;
}
// The parameters go on to the stack in order (making sure that they are evaluated in order)
// so we need to pop them off the stack in reverse order
var i = paramSize;
while (i--) {
param = this.popStack();
params[i] = param;
if (this.trackIds) {
ids[i] = this.popStack();
}
if (this.stringParams) {
types[i] = this.popStack();
contexts[i] = this.popStack();
}
}
if (this.trackIds) {
options.ids = "[" + ids.join(",") + "]";
}
if (this.stringParams) {
options.types = "[" + types.join(",") + "]";
options.contexts = "[" + contexts.join(",") + "]";
}
if (this.options.data) {
options.data = "data";
}
return options;
},
// the params and contexts arguments are passed in arrays
// to fill in
setupParams: function(helperName, paramSize, params, useRegister) {
var options = this.objectLiteral(this.setupOptions(helperName, paramSize, params));
if (useRegister) {
this.useRegister('options');
params.push('options');
return 'options=' + options;
} else {
params.push(options);
return '';
}
}
};
var reservedWords = (
"break else new var" +
" case finally return void" +
" catch for switch while" +
" continue function this with" +
" default if throw" +
" delete in try" +
" do instanceof typeof" +
" abstract enum int short" +
" boolean export interface static" +
" byte extends long super" +
" char final native synchronized" +
" class float package throws" +
" const goto private transient" +
" debugger implements protected volatile" +
" double import public let yield"
).split(" ");
var compilerWords = JavaScriptCompiler.RESERVED_WORDS = {};
for(var i=0, l=reservedWords.length; i<l; i++) {
compilerWords[reservedWords[i]] = true;
}
JavaScriptCompiler.isValidJavaScriptVariableName = function(name) {
return !JavaScriptCompiler.RESERVED_WORDS[name] && /^[a-zA-Z_$][0-9a-zA-Z_$]*$/.test(name);
};
exports["default"] = JavaScriptCompiler; |