Tom Locke
767 lines
21 KiB
JavaScript
767 lines
21 KiB
JavaScript
var Handlebars = require("./base");
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// BEGIN(BROWSER)
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Handlebars.Compiler = function() {};
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Handlebars.JavaScriptCompiler = function() {};
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(function(Compiler, JavaScriptCompiler) {
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Compiler.OPCODE_MAP = {
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appendContent: 1,
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getContext: 2,
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lookupWithHelpers: 3,
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lookup: 4,
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append: 5,
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invokeMustache: 6,
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appendEscaped: 7,
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pushString: 8,
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truthyOrFallback: 9,
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functionOrFallback: 10,
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invokeProgram: 11,
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invokePartial: 12,
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push: 13,
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assignToHash: 15,
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pushStringParam: 16
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};
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Compiler.MULTI_PARAM_OPCODES = {
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appendContent: 1,
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getContext: 1,
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lookupWithHelpers: 2,
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lookup: 1,
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invokeMustache: 3,
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pushString: 1,
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truthyOrFallback: 1,
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functionOrFallback: 1,
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invokeProgram: 3,
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invokePartial: 1,
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push: 1,
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assignToHash: 1,
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pushStringParam: 1
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};
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Compiler.DISASSEMBLE_MAP = {};
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for(var prop in Compiler.OPCODE_MAP) {
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var value = Compiler.OPCODE_MAP[prop];
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Compiler.DISASSEMBLE_MAP[value] = prop;
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}
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Compiler.multiParamSize = function(code) {
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return Compiler.MULTI_PARAM_OPCODES[Compiler.DISASSEMBLE_MAP[code]];
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};
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Compiler.prototype = {
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compiler: Compiler,
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disassemble: function() {
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var opcodes = this.opcodes, opcode, nextCode;
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var out = [], str, name, value;
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for(var i=0, l=opcodes.length; i<l; i++) {
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opcode = opcodes[i];
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if(opcode === 'DECLARE') {
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name = opcodes[++i];
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value = opcodes[++i];
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out.push("DECLARE " + name + " = " + value);
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} else {
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str = Compiler.DISASSEMBLE_MAP[opcode];
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var extraParams = Compiler.multiParamSize(opcode);
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var codes = [];
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for(var j=0; j<extraParams; j++) {
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nextCode = opcodes[++i];
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if(typeof nextCode === "string") {
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nextCode = "\"" + nextCode.replace("\n", "\\n") + "\"";
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}
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codes.push(nextCode);
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}
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str = str + " " + codes.join(" ");
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out.push(str);
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}
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}
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return out.join("\n");
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},
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guid: 0,
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compile: function(program, options) {
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this.children = [];
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this.depths = {list: []};
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this.options = options;
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// These changes will propagate to the other compiler components
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var knownHelpers = this.options.knownHelpers;
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this.options.knownHelpers = {
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'helperMissing': true,
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'blockHelperMissing': true,
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'each': true,
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'if': true,
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'unless': true,
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'with': true
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};
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if (knownHelpers) {
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for (var name in knownHelpers) {
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this.options.knownHelpers[name] = knownHelpers[name];
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}
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}
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return this.program(program);
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},
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accept: function(node) {
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return this[node.type](node);
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},
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program: function(program) {
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var statements = program.statements, statement;
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this.opcodes = [];
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for(var i=0, l=statements.length; i<l; i++) {
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statement = statements[i];
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this[statement.type](statement);
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}
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this.isSimple = l === 1;
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this.depths.list = this.depths.list.sort(function(a, b) {
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return a - b;
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});
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return this;
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},
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compileProgram: function(program) {
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var result = new this.compiler().compile(program, this.options);
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var guid = this.guid++;
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this.usePartial = this.usePartial || result.usePartial;
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this.children[guid] = result;
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for(var i=0, l=result.depths.list.length; i<l; i++) {
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depth = result.depths.list[i];
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if(depth < 2) { continue; }
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else { this.addDepth(depth - 1); }
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}
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return guid;
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},
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block: function(block) {
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var mustache = block.mustache;
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var depth, child, inverse, inverseGuid;
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var params = this.setupStackForMustache(mustache);
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var programGuid = this.compileProgram(block.program);
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if(block.program.inverse) {
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inverseGuid = this.compileProgram(block.program.inverse);
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this.declare('inverse', inverseGuid);
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}
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this.opcode('invokeProgram', programGuid, params.length, !!mustache.hash);
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this.declare('inverse', null);
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this.opcode('append');
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},
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inverse: function(block) {
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var params = this.setupStackForMustache(block.mustache);
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var programGuid = this.compileProgram(block.program);
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this.declare('inverse', programGuid);
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this.opcode('invokeProgram', null, params.length, !!block.mustache.hash);
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this.opcode('append');
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},
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hash: function(hash) {
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var pairs = hash.pairs, pair, val;
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this.opcode('push', '{}');
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for(var i=0, l=pairs.length; i<l; i++) {
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pair = pairs[i];
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val = pair[1];
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this.accept(val);
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this.opcode('assignToHash', pair[0]);
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}
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},
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partial: function(partial) {
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var id = partial.id;
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this.usePartial = true;
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if(partial.context) {
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this.ID(partial.context);
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} else {
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this.opcode('push', 'depth0');
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}
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this.opcode('invokePartial', id.original);
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this.opcode('append');
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},
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content: function(content) {
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this.opcode('appendContent', content.string);
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},
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mustache: function(mustache) {
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var params = this.setupStackForMustache(mustache);
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this.opcode('invokeMustache', params.length, mustache.id.original, !!mustache.hash);
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if(mustache.escaped && !this.options.noEscape) {
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this.opcode('appendEscaped');
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} else {
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this.opcode('append');
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}
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},
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ID: function(id) {
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this.addDepth(id.depth);
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this.opcode('getContext', id.depth);
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this.opcode('lookupWithHelpers', id.parts[0] || null, id.isScoped || false);
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for(var i=1, l=id.parts.length; i<l; i++) {
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this.opcode('lookup', id.parts[i]);
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}
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},
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STRING: function(string) {
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this.opcode('pushString', string.string);
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},
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INTEGER: function(integer) {
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this.opcode('push', integer.integer);
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},
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BOOLEAN: function(bool) {
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this.opcode('push', bool.bool);
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},
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comment: function() {},
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// HELPERS
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pushParams: function(params) {
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var i = params.length, param;
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while(i--) {
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param = params[i];
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if(this.options.stringParams) {
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if(param.depth) {
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this.addDepth(param.depth);
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}
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this.opcode('getContext', param.depth || 0);
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this.opcode('pushStringParam', param.string);
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} else {
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this[param.type](param);
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}
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}
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},
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opcode: function(name, val1, val2, val3) {
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this.opcodes.push(Compiler.OPCODE_MAP[name]);
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if(val1 !== undefined) { this.opcodes.push(val1); }
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if(val2 !== undefined) { this.opcodes.push(val2); }
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if(val3 !== undefined) { this.opcodes.push(val3); }
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},
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declare: function(name, value) {
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this.opcodes.push('DECLARE');
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this.opcodes.push(name);
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this.opcodes.push(value);
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},
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addDepth: function(depth) {
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if(depth === 0) { return; }
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if(!this.depths[depth]) {
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this.depths[depth] = true;
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this.depths.list.push(depth);
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}
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},
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setupStackForMustache: function(mustache) {
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var params = mustache.params;
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this.pushParams(params);
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if(mustache.hash) {
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this.hash(mustache.hash);
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}
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this.ID(mustache.id);
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return params;
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}
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};
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JavaScriptCompiler.prototype = {
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// PUBLIC API: You can override these methods in a subclass to provide
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// alternative compiled forms for name lookup and buffering semantics
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nameLookup: function(parent, name, type) {
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if (/^[0-9]+$/.test(name)) {
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return parent + "[" + name + "]";
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} else if (JavaScriptCompiler.isValidJavaScriptVariableName(name)) {
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return parent + "." + name;
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}
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else {
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return parent + "['" + name + "']";
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}
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},
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appendToBuffer: function(string) {
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if (this.environment.isSimple) {
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return "return " + string + ";";
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} else {
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return "buffer += " + string + ";";
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}
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},
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initializeBuffer: function() {
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return this.quotedString("");
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},
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// END PUBLIC API
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compile: function(environment, options, context, asObject) {
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this.environment = environment;
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this.options = options || {};
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this.name = this.environment.name;
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this.isChild = !!context;
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this.context = context || {
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programs: [],
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aliases: { self: 'this' },
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registers: {list: []}
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};
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this.preamble();
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this.stackSlot = 0;
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this.stackVars = [];
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this.compileChildren(environment, options);
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var opcodes = environment.opcodes, opcode;
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this.i = 0;
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for(l=opcodes.length; this.i<l; this.i++) {
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opcode = this.nextOpcode(0);
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if(opcode[0] === 'DECLARE') {
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this.i = this.i + 2;
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this[opcode[1]] = opcode[2];
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} else {
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this.i = this.i + opcode[1].length;
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this[opcode[0]].apply(this, opcode[1]);
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}
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}
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return this.createFunctionContext(asObject);
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},
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nextOpcode: function(n) {
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var opcodes = this.environment.opcodes, opcode = opcodes[this.i + n], name, val;
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var extraParams, codes;
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if(opcode === 'DECLARE') {
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name = opcodes[this.i + 1];
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val = opcodes[this.i + 2];
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return ['DECLARE', name, val];
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} else {
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name = Compiler.DISASSEMBLE_MAP[opcode];
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extraParams = Compiler.multiParamSize(opcode);
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codes = [];
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for(var j=0; j<extraParams; j++) {
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codes.push(opcodes[this.i + j + 1 + n]);
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}
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return [name, codes];
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}
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},
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eat: function(opcode) {
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this.i = this.i + opcode.length;
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},
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preamble: function() {
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var out = [];
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if (!this.isChild) {
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var copies = "helpers = helpers || Handlebars.helpers;";
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if(this.environment.usePartial) { copies = copies + " partials = partials || Handlebars.partials;"; }
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out.push(copies);
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} else {
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out.push('');
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}
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if (!this.environment.isSimple) {
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out.push(", buffer = " + this.initializeBuffer());
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} else {
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out.push("");
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}
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// track the last context pushed into place to allow skipping the
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// getContext opcode when it would be a noop
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this.lastContext = 0;
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this.source = out;
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},
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createFunctionContext: function(asObject) {
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var locals = this.stackVars;
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if (!this.isChild) {
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locals = locals.concat(this.context.registers.list);
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}
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if(locals.length > 0) {
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this.source[1] = this.source[1] + ", " + locals.join(", ");
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}
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// Generate minimizer alias mappings
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if (!this.isChild) {
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var aliases = []
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for (var alias in this.context.aliases) {
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this.source[1] = this.source[1] + ', ' + alias + '=' + this.context.aliases[alias];
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}
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}
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if (this.source[1]) {
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this.source[1] = "var " + this.source[1].substring(2) + ";";
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}
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// Merge children
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if (!this.isChild) {
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this.source[1] += '\n' + this.context.programs.join('\n') + '\n';
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}
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if (!this.environment.isSimple) {
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this.source.push("return buffer;");
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}
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var params = this.isChild ? ["depth0", "data"] : ["Handlebars", "depth0", "helpers", "partials", "data"];
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for(var i=0, l=this.environment.depths.list.length; i<l; i++) {
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params.push("depth" + this.environment.depths.list[i]);
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}
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if(params.length === 4 && !this.environment.usePartial) { params.pop(); }
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if (asObject) {
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params.push(this.source.join("\n "));
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return Function.apply(this, params);
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} else {
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var functionSource = 'function ' + (this.name || '') + '(' + params.join(',') + ') {\n ' + this.source.join("\n ") + '}';
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Handlebars.log(Handlebars.logger.DEBUG, functionSource + "\n\n");
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return functionSource;
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}
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},
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appendContent: function(content) {
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this.source.push(this.appendToBuffer(this.quotedString(content)));
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},
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append: function() {
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var local = this.popStack();
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this.source.push("if(" + local + " || " + local + " === 0) { " + this.appendToBuffer(local) + " }");
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if (this.environment.isSimple) {
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this.source.push("else { " + this.appendToBuffer("''") + " }");
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}
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},
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appendEscaped: function() {
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var opcode = this.nextOpcode(1), extra = "";
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this.context.aliases.escapeExpression = 'this.escapeExpression';
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if(opcode[0] === 'appendContent') {
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extra = " + " + this.quotedString(opcode[1][0]);
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this.eat(opcode);
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}
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this.source.push(this.appendToBuffer("escapeExpression(" + this.popStack() + ")" + extra));
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},
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getContext: function(depth) {
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if(this.lastContext !== depth) {
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this.lastContext = depth;
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}
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},
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lookupWithHelpers: function(name, isScoped) {
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if(name) {
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var topStack = this.nextStack();
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this.usingKnownHelper = false;
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var toPush;
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if (!isScoped && this.options.knownHelpers[name]) {
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toPush = topStack + " = " + this.nameLookup('helpers', name, 'helper');
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this.usingKnownHelper = true;
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} else if (isScoped || this.options.knownHelpersOnly) {
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toPush = topStack + " = " + this.nameLookup('depth' + this.lastContext, name, 'context');
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} else {
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toPush = topStack + " = "
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+ this.nameLookup('helpers', name, 'helper')
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+ " || "
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+ this.nameLookup('depth' + this.lastContext, name, 'context');
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}
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toPush += ';';
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this.source.push(toPush);
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} else {
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this.pushStack('depth' + this.lastContext);
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}
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},
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lookup: function(name) {
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var topStack = this.topStack();
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this.source.push(topStack + " = (" + topStack + " === null || " + topStack + " === undefined || " + topStack + " === false ? " +
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topStack + " : " + this.nameLookup(topStack, name, 'context') + ");");
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},
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pushStringParam: function(string) {
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this.pushStack('depth' + this.lastContext);
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this.pushString(string);
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},
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pushString: function(string) {
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this.pushStack(this.quotedString(string));
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},
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push: function(name) {
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this.pushStack(name);
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},
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invokeMustache: function(paramSize, original, hasHash) {
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this.populateParams(paramSize, this.quotedString(original), "{}", null, hasHash, function(nextStack, helperMissingString, id) {
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if (!this.usingKnownHelper) {
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this.context.aliases.helperMissing = 'helpers.helperMissing';
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this.context.aliases.undef = 'void 0';
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this.source.push("else if(" + id + "=== undef) { " + nextStack + " = helperMissing.call(" + helperMissingString + "); }");
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if (nextStack !== id) {
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this.source.push("else { " + nextStack + " = " + id + "; }");
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}
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}
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});
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},
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invokeProgram: function(guid, paramSize, hasHash) {
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var inverse = this.programExpression(this.inverse);
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var mainProgram = this.programExpression(guid);
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|
|
|
this.populateParams(paramSize, null, mainProgram, inverse, hasHash, function(nextStack, helperMissingString, id) {
|
|
if (!this.usingKnownHelper) {
|
|
this.context.aliases.blockHelperMissing = 'helpers.blockHelperMissing';
|
|
this.source.push("else { " + nextStack + " = blockHelperMissing.call(" + helperMissingString + "); }");
|
|
}
|
|
});
|
|
},
|
|
|
|
populateParams: function(paramSize, helperId, program, inverse, hasHash, fn) {
|
|
var needsRegister = hasHash || this.options.stringParams || inverse || this.options.data;
|
|
var id = this.popStack(), nextStack;
|
|
var params = [], param, stringParam, stringOptions;
|
|
|
|
if (needsRegister) {
|
|
this.register('tmp1', program);
|
|
stringOptions = 'tmp1';
|
|
} else {
|
|
stringOptions = '{ hash: {} }';
|
|
}
|
|
|
|
if (needsRegister) {
|
|
var hash = (hasHash ? this.popStack() : '{}');
|
|
this.source.push('tmp1.hash = ' + hash + ';');
|
|
}
|
|
|
|
if(this.options.stringParams) {
|
|
this.source.push('tmp1.contexts = [];');
|
|
}
|
|
|
|
for(var i=0; i<paramSize; i++) {
|
|
param = this.popStack();
|
|
params.push(param);
|
|
|
|
if(this.options.stringParams) {
|
|
this.source.push('tmp1.contexts.push(' + this.popStack() + ');');
|
|
}
|
|
}
|
|
|
|
if(inverse) {
|
|
this.source.push('tmp1.fn = tmp1;');
|
|
this.source.push('tmp1.inverse = ' + inverse + ';');
|
|
}
|
|
|
|
if(this.options.data) {
|
|
this.source.push('tmp1.data = data;');
|
|
}
|
|
|
|
params.push(stringOptions);
|
|
|
|
this.populateCall(params, id, helperId || id, fn);
|
|
},
|
|
|
|
populateCall: function(params, id, helperId, fn) {
|
|
var paramString = ["depth0"].concat(params).join(", ");
|
|
var helperMissingString = ["depth0"].concat(helperId).concat(params).join(", ");
|
|
|
|
var nextStack = this.nextStack();
|
|
|
|
if (this.usingKnownHelper) {
|
|
this.source.push(nextStack + " = " + id + ".call(" + paramString + ");");
|
|
} else {
|
|
this.context.aliases.functionType = '"function"';
|
|
this.source.push("if(typeof " + id + " === functionType) { " + nextStack + " = " + id + ".call(" + paramString + "); }");
|
|
}
|
|
fn.call(this, nextStack, helperMissingString, id);
|
|
this.usingKnownHelper = false;
|
|
},
|
|
|
|
invokePartial: function(context) {
|
|
this.pushStack("self.invokePartial(" + this.nameLookup('partials', context, 'partial') + ", '" + context + "', " + this.popStack() + ", helpers, partials);");
|
|
},
|
|
|
|
assignToHash: function(key) {
|
|
var value = this.popStack();
|
|
var hash = this.topStack();
|
|
|
|
this.source.push(hash + "['" + key + "'] = " + value + ";");
|
|
},
|
|
|
|
// 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();
|
|
|
|
this.context.programs.push(''); // Placeholder to prevent name conflicts for nested children
|
|
var index = this.context.programs.length;
|
|
child.index = index;
|
|
child.name = 'program' + index;
|
|
this.context.programs[index] = compiler.compile(child, options, this.context);
|
|
}
|
|
},
|
|
|
|
programExpression: function(guid) {
|
|
if(guid == null) { return "self.noop"; }
|
|
|
|
var child = this.environment.children[guid],
|
|
depths = child.depths.list;
|
|
var programParams = [child.index, child.name, "data"];
|
|
|
|
for(var i=0, l = depths.length; i<l; i++) {
|
|
depth = depths[i];
|
|
|
|
if(depth === 1) { programParams.push("depth0"); }
|
|
else { programParams.push("depth" + (depth - 1)); }
|
|
}
|
|
|
|
if(depths.length === 0) {
|
|
return "self.program(" + programParams.join(", ") + ")";
|
|
} else {
|
|
programParams.shift();
|
|
return "self.programWithDepth(" + programParams.join(", ") + ")";
|
|
}
|
|
},
|
|
|
|
register: function(name, val) {
|
|
this.useRegister(name);
|
|
this.source.push(name + " = " + val + ";");
|
|
},
|
|
|
|
useRegister: function(name) {
|
|
if(!this.context.registers[name]) {
|
|
this.context.registers[name] = true;
|
|
this.context.registers.list.push(name);
|
|
}
|
|
},
|
|
|
|
pushStack: function(item) {
|
|
this.source.push(this.nextStack() + " = " + item + ";");
|
|
return "stack" + this.stackSlot;
|
|
},
|
|
|
|
nextStack: function() {
|
|
this.stackSlot++;
|
|
if(this.stackSlot > this.stackVars.length) { this.stackVars.push("stack" + this.stackSlot); }
|
|
return "stack" + this.stackSlot;
|
|
},
|
|
|
|
popStack: function() {
|
|
return "stack" + this.stackSlot--;
|
|
},
|
|
|
|
topStack: function() {
|
|
return "stack" + this.stackSlot;
|
|
},
|
|
|
|
quotedString: function(str) {
|
|
return '"' + str
|
|
.replace(/\\/g, '\\\\')
|
|
.replace(/"/g, '\\"')
|
|
.replace(/\n/g, '\\n')
|
|
.replace(/\r/g, '\\r') + '"';
|
|
}
|
|
};
|
|
|
|
var reservedWords = ("break case catch continue default delete do else finally " +
|
|
"for function if in instanceof new return switch this throw " +
|
|
"try typeof var void while with null true false").split(" ");
|
|
|
|
var compilerWords = JavaScriptCompiler.RESERVED_WORDS = {};
|
|
|
|
for(var i=0, l=reservedWords.length; i<l; i++) {
|
|
compilerWords[reservedWords[i]] = true;
|
|
}
|
|
|
|
JavaScriptCompiler.isValidJavaScriptVariableName = function(name) {
|
|
if(!JavaScriptCompiler.RESERVED_WORDS[name] && /^[a-zA-Z_$][0-9a-zA-Z_$]+$/.test(name)) {
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
})(Handlebars.Compiler, Handlebars.JavaScriptCompiler);
|
|
|
|
Handlebars.precompile = function(string, options) {
|
|
options = options || {};
|
|
|
|
var ast = Handlebars.parse(string);
|
|
var environment = new Handlebars.Compiler().compile(ast, options);
|
|
return new Handlebars.JavaScriptCompiler().compile(environment, options);
|
|
};
|
|
|
|
Handlebars.compile = function(string, options) {
|
|
options = options || {};
|
|
|
|
var ast = Handlebars.parse(string);
|
|
var environment = new Handlebars.Compiler().compile(ast, options);
|
|
var templateSpec = new Handlebars.JavaScriptCompiler().compile(environment, options, undefined, true);
|
|
return Handlebars.template(templateSpec);
|
|
};
|
|
|
|
// END(BROWSER)
|
|
|