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| "use strict";
var Exception = require("../exception")["default"];
var isArray = require("../utils").isArray;
var slice = [].slice;
function Compiler() {}
exports.Compiler = Compiler;// the foundHelper register will disambiguate helper lookup from finding a
// function in a context. This is necessary for mustache compatibility, which
// requires that context functions in blocks are evaluated by blockHelperMissing,
// and then proceed as if the resulting value was provided to blockHelperMissing.
Compiler.prototype = {
compiler: Compiler,
equals: function(other) {
var len = this.opcodes.length;
if (other.opcodes.length !== len) {
return false;
}
for (var i = 0; i < len; i++) {
var opcode = this.opcodes[i],
otherOpcode = other.opcodes[i];
if (opcode.opcode !== otherOpcode.opcode || !argEquals(opcode.args, otherOpcode.args)) {
return false;
}
}
// We know that length is the same between the two arrays because they are directly tied
// to the opcode behavior above.
len = this.children.length;
for (i = 0; i < len; i++) {
if (!this.children[i].equals(other.children[i])) {
return false;
}
}
return true;
},
guid: 0,
compile: function(program, options) {
this.opcodes = [];
this.children = [];
this.depths = {list: []};
this.options = options;
this.stringParams = options.stringParams;
this.trackIds = options.trackIds;
// These changes will propagate to the other compiler components
var knownHelpers = this.options.knownHelpers;
this.options.knownHelpers = {
'helperMissing': true,
'blockHelperMissing': true,
'each': true,
'if': true,
'unless': true,
'with': true,
'log': true,
'lookup': true
};
if (knownHelpers) {
for (var name in knownHelpers) {
this.options.knownHelpers[name] = knownHelpers[name];
}
}
return this.accept(program);
},
accept: function(node) {
return this[node.type](node);
},
program: function(program) {
var statements = program.statements;
for(var i=0, l=statements.length; i<l; i++) {
this.accept(statements[i]);
}
this.isSimple = l === 1;
this.depths.list = this.depths.list.sort(function(a, b) {
return a - b;
});
return this;
},
compileProgram: function(program) {
var result = new this.compiler().compile(program, this.options);
var guid = this.guid++, depth;
this.usePartial = this.usePartial || result.usePartial;
this.children[guid] = result;
for(var i=0, l=result.depths.list.length; i<l; i++) {
depth = result.depths.list[i];
if(depth < 2) { continue; }
else { this.addDepth(depth - 1); }
}
return guid;
},
block: function(block) {
var mustache = block.mustache,
program = block.program,
inverse = block.inverse;
if (program) {
program = this.compileProgram(program);
}
if (inverse) {
inverse = this.compileProgram(inverse);
}
var sexpr = mustache.sexpr;
var type = this.classifySexpr(sexpr);
if (type === "helper") {
this.helperSexpr(sexpr, program, inverse);
} else if (type === "simple") {
this.simpleSexpr(sexpr);
// now that the simple mustache is resolved, we need to
// evaluate it by executing `blockHelperMissing`
this.opcode('pushProgram', program);
this.opcode('pushProgram', inverse);
this.opcode('emptyHash');
this.opcode('blockValue', sexpr.id.original);
} else {
this.ambiguousSexpr(sexpr, program, inverse);
// now that the simple mustache is resolved, we need to
// evaluate it by executing `blockHelperMissing`
this.opcode('pushProgram', program);
this.opcode('pushProgram', inverse);
this.opcode('emptyHash');
this.opcode('ambiguousBlockValue');
}
this.opcode('append');
},
hash: function(hash) {
var pairs = hash.pairs, i, l;
this.opcode('pushHash');
for(i=0, l=pairs.length; i<l; i++) {
this.pushParam(pairs[i][1]);
}
while(i--) {
this.opcode('assignToHash', pairs[i][0]);
}
this.opcode('popHash');
},
partial: function(partial) {
var partialName = partial.partialName;
this.usePartial = true;
if (partial.hash) {
this.accept(partial.hash);
} else {
this.opcode('push', 'undefined');
}
if (partial.context) {
this.accept(partial.context);
} else {
this.opcode('getContext', 0);
this.opcode('pushContext');
}
this.opcode('invokePartial', partialName.name, partial.indent || '');
this.opcode('append');
},
content: function(content) {
if (content.string) {
this.opcode('appendContent', content.string);
}
},
mustache: function(mustache) {
this.sexpr(mustache.sexpr);
if(mustache.escaped && !this.options.noEscape) {
this.opcode('appendEscaped');
} else {
this.opcode('append');
}
},
ambiguousSexpr: function(sexpr, program, inverse) {
var id = sexpr.id,
name = id.parts[0],
isBlock = program != null || inverse != null;
this.opcode('getContext', id.depth);
this.opcode('pushProgram', program);
this.opcode('pushProgram', inverse);
this.ID(id);
this.opcode('invokeAmbiguous', name, isBlock);
},
simpleSexpr: function(sexpr) {
var id = sexpr.id;
if (id.type === 'DATA') {
this.DATA(id);
} else if (id.parts.length) {
this.ID(id);
} else {
// Simplified ID for `this`
this.addDepth(id.depth);
this.opcode('getContext', id.depth);
this.opcode('pushContext');
}
this.opcode('resolvePossibleLambda');
},
helperSexpr: function(sexpr, program, inverse) {
var params = this.setupFullMustacheParams(sexpr, program, inverse),
id = sexpr.id,
name = id.parts[0];
if (this.options.knownHelpers[name]) {
this.opcode('invokeKnownHelper', params.length, name);
} else if (this.options.knownHelpersOnly) {
throw new Exception("You specified knownHelpersOnly, but used the unknown helper " + name, sexpr);
} else {
id.falsy = true;
this.ID(id);
this.opcode('invokeHelper', params.length, id.original, id.isSimple);
}
},
sexpr: function(sexpr) {
var type = this.classifySexpr(sexpr);
if (type === "simple") {
this.simpleSexpr(sexpr);
} else if (type === "helper") {
this.helperSexpr(sexpr);
} else {
this.ambiguousSexpr(sexpr);
}
},
ID: function(id) {
this.addDepth(id.depth);
this.opcode('getContext', id.depth);
var name = id.parts[0];
if (!name) {
// Context reference, i.e. `{{foo .}}` or `{{foo ..}}`
this.opcode('pushContext');
} else {
this.opcode('lookupOnContext', id.parts, id.falsy, id.isScoped);
}
},
DATA: function(data) {
this.options.data = true;
this.opcode('lookupData', data.id.depth, data.id.parts);
},
STRING: function(string) {
this.opcode('pushString', string.string);
},
NUMBER: function(number) {
this.opcode('pushLiteral', number.number);
},
BOOLEAN: function(bool) {
this.opcode('pushLiteral', bool.bool);
},
comment: function() {},
// HELPERS
opcode: function(name) {
this.opcodes.push({ opcode: name, args: slice.call(arguments, 1) });
},
addDepth: function(depth) {
if(depth === 0) { return; }
if(!this.depths[depth]) {
this.depths[depth] = true;
this.depths.list.push(depth);
}
},
classifySexpr: function(sexpr) {
var isHelper = sexpr.isHelper;
var isEligible = sexpr.eligibleHelper;
var options = this.options;
// if ambiguous, we can possibly resolve the ambiguity now
// An eligible helper is one that does not have a complex path, i.e. `this.foo`, `../foo` etc.
if (isEligible && !isHelper) {
var name = sexpr.id.parts[0];
if (options.knownHelpers[name]) {
isHelper = true;
} else if (options.knownHelpersOnly) {
isEligible = false;
}
}
if (isHelper) { return "helper"; }
else if (isEligible) { return "ambiguous"; }
else { return "simple"; }
},
pushParams: function(params) {
for(var i=0, l=params.length; i<l; i++) {
this.pushParam(params[i]);
}
},
pushParam: function(val) {
if (this.stringParams) {
if(val.depth) {
this.addDepth(val.depth);
}
this.opcode('getContext', val.depth || 0);
this.opcode('pushStringParam', val.stringModeValue, val.type);
if (val.type === 'sexpr') {
// Subexpressions get evaluated and passed in
// in string params mode.
this.sexpr(val);
}
} else {
if (this.trackIds) {
this.opcode('pushId', val.type, val.idName || val.stringModeValue);
}
this.accept(val);
}
},
setupFullMustacheParams: function(sexpr, program, inverse) {
var params = sexpr.params;
this.pushParams(params);
this.opcode('pushProgram', program);
this.opcode('pushProgram', inverse);
if (sexpr.hash) {
this.hash(sexpr.hash);
} else {
this.opcode('emptyHash');
}
return params;
}
};
function precompile(input, options, env) {
if (input == null || (typeof input !== 'string' && input.constructor !== env.AST.ProgramNode)) {
throw new Exception("You must pass a string or Handlebars AST to Handlebars.precompile. You passed " + input);
}
options = options || {};
if (!('data' in options)) {
options.data = true;
}
if (options.compat) {
options.useDepths = true;
}
var ast = env.parse(input);
var environment = new env.Compiler().compile(ast, options);
return new env.JavaScriptCompiler().compile(environment, options);
}
exports.precompile = precompile;function compile(input, options, env) {
if (input == null || (typeof input !== 'string' && input.constructor !== env.AST.ProgramNode)) {
throw new Exception("You must pass a string or Handlebars AST to Handlebars.compile. You passed " + input);
}
options = options || {};
if (!('data' in options)) {
options.data = true;
}
if (options.compat) {
options.useDepths = true;
}
var compiled;
function compileInput() {
var ast = env.parse(input);
var environment = new env.Compiler().compile(ast, options);
var templateSpec = new env.JavaScriptCompiler().compile(environment, options, undefined, true);
return env.template(templateSpec);
}
// Template is only compiled on first use and cached after that point.
var ret = function(context, options) {
if (!compiled) {
compiled = compileInput();
}
return compiled.call(this, context, options);
};
ret._setup = function(options) {
if (!compiled) {
compiled = compileInput();
}
return compiled._setup(options);
};
ret._child = function(i, data, depths) {
if (!compiled) {
compiled = compileInput();
}
return compiled._child(i, data, depths);
};
return ret;
}
exports.compile = compile;function argEquals(a, b) {
if (a === b) {
return true;
}
if (isArray(a) && isArray(b) && a.length === b.length) {
for (var i = 0; i < a.length; i++) {
if (!argEquals(a[i], b[i])) {
return false;
}
}
return true;
}
} |