ember-legacy-class-transform
Version:
The default blueprint for ember-cli addons.
311 lines (299 loc) • 36.8 kB
JavaScript
'use strict';
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.BlockSymbolTable = exports.ProgramSymbolTable = exports.SymbolTable = undefined;
var _util = require('@glimmer/util');
class SymbolTable {
static top() {
return new ProgramSymbolTable();
}
child(locals) {
let symbols = locals.map(name => this.allocate(name));
return new BlockSymbolTable(this, locals, symbols);
}
}
exports.SymbolTable = SymbolTable;
class ProgramSymbolTable extends SymbolTable {
constructor() {
super(...arguments);
this.symbols = [];
this.size = 1;
this.named = (0, _util.dict)();
this.blocks = (0, _util.dict)();
}
has(_name) {
return false;
}
get(_name) {
throw (0, _util.unreachable)();
}
getLocalsMap() {
return {};
}
getEvalInfo() {
return [];
}
allocateNamed(name) {
let named = this.named[name];
if (!named) {
named = this.named[name] = this.allocate(`@${name}`);
}
return named;
}
allocateBlock(name) {
let block = this.blocks[name];
if (!block) {
block = this.blocks[name] = this.allocate(`&${name}`);
}
return block;
}
allocate(identifier) {
this.symbols.push(identifier);
return this.size++;
}
}
exports.ProgramSymbolTable = ProgramSymbolTable;
class BlockSymbolTable extends SymbolTable {
constructor(parent, symbols, slots) {
super();
this.parent = parent;
this.symbols = symbols;
this.slots = slots;
}
has(name) {
return this.symbols.indexOf(name) !== -1 || this.parent.has(name);
}
get(name) {
let slot = this.symbols.indexOf(name);
return slot === -1 ? this.parent.get(name) : this.slots[slot];
}
getLocalsMap() {
let dict = this.parent.getLocalsMap();
this.symbols.forEach(symbol => dict[symbol] = this.get(symbol));
return dict;
}
getEvalInfo() {
let locals = this.getLocalsMap();
return Object.keys(locals).map(symbol => locals[symbol]);
}
allocateNamed(name) {
return this.parent.allocateNamed(name);
}
allocateBlock(name) {
return this.parent.allocateBlock(name);
}
allocate(identifier) {
return this.parent.allocate(identifier);
}
}
exports.BlockSymbolTable = BlockSymbolTable; /**
* Takes in an AST and outputs a list of actions to be consumed
* by a compiler. For example, the template
*
* foo{{bar}}<div>baz</div>
*
* produces the actions
*
* [['startProgram', [programNode, 0]],
* ['text', [textNode, 0, 3]],
* ['mustache', [mustacheNode, 1, 3]],
* ['openElement', [elementNode, 2, 3, 0]],
* ['text', [textNode, 0, 1]],
* ['closeElement', [elementNode, 2, 3],
* ['endProgram', [programNode]]]
*
* This visitor walks the AST depth first and backwards. As
* a result the bottom-most child template will appear at the
* top of the actions list whereas the root template will appear
* at the bottom of the list. For example,
*
* <div>{{#if}}foo{{else}}bar<b></b>{{/if}}</div>
*
* produces the actions
*
* [['startProgram', [programNode, 0]],
* ['text', [textNode, 0, 2, 0]],
* ['openElement', [elementNode, 1, 2, 0]],
* ['closeElement', [elementNode, 1, 2]],
* ['endProgram', [programNode]],
* ['startProgram', [programNode, 0]],
* ['text', [textNode, 0, 1]],
* ['endProgram', [programNode]],
* ['startProgram', [programNode, 2]],
* ['openElement', [elementNode, 0, 1, 1]],
* ['block', [blockNode, 0, 1]],
* ['closeElement', [elementNode, 0, 1]],
* ['endProgram', [programNode]]]
*
* The state of the traversal is maintained by a stack of frames.
* Whenever a node with children is entered (either a ProgramNode
* or an ElementNode) a frame is pushed onto the stack. The frame
* contains information about the state of the traversal of that
* node. For example,
*
* - index of the current child node being visited
* - the number of mustaches contained within its child nodes
* - the list of actions generated by its child nodes
*/
class Frame {
constructor() {
this.parentNode = null;
this.children = null;
this.childIndex = null;
this.childCount = null;
this.childTemplateCount = 0;
this.mustacheCount = 0;
this.actions = [];
this.blankChildTextNodes = null;
this.symbols = null;
}
}
class TemplateVisitor {
constructor() {
this.frameStack = [];
this.actions = [];
this.programDepth = -1;
}
visit(node) {
this[node.type](node);
}
// Traversal methods
Program(program) {
this.programDepth++;
let parentFrame = this.getCurrentFrame();
let programFrame = this.pushFrame();
if (!parentFrame) {
program['symbols'] = SymbolTable.top();
} else {
program['symbols'] = parentFrame.symbols.child(program.blockParams);
}
let startType, endType;
if (this.programDepth === 0) {
startType = 'startProgram';
endType = 'endProgram';
} else {
startType = 'startBlock';
endType = 'endBlock';
}
programFrame.parentNode = program;
programFrame.children = program.body;
programFrame.childCount = program.body.length;
programFrame.blankChildTextNodes = [];
programFrame.actions.push([endType, [program, this.programDepth]]);
programFrame.symbols = program['symbols'];
for (let i = program.body.length - 1; i >= 0; i--) {
programFrame.childIndex = i;
this.visit(program.body[i]);
}
programFrame.actions.push([startType, [program, programFrame.childTemplateCount, programFrame.blankChildTextNodes.reverse()]]);
this.popFrame();
this.programDepth--;
// Push the completed template into the global actions list
if (parentFrame) {
parentFrame.childTemplateCount++;
}
this.actions.push(...programFrame.actions.reverse());
}
ElementNode(element) {
let parentFrame = this.currentFrame;
let elementFrame = this.pushFrame();
elementFrame.parentNode = element;
elementFrame.children = element.children;
elementFrame.childCount = element.children.length;
elementFrame.mustacheCount += element.modifiers.length;
elementFrame.blankChildTextNodes = [];
elementFrame.symbols = element['symbols'] = parentFrame.symbols.child(element.blockParams);
let actionArgs = [element, parentFrame.childIndex, parentFrame.childCount];
elementFrame.actions.push(['closeElement', actionArgs]);
for (let i = element.attributes.length - 1; i >= 0; i--) {
this.visit(element.attributes[i]);
}
for (let i = element.children.length - 1; i >= 0; i--) {
elementFrame.childIndex = i;
this.visit(element.children[i]);
}
let open = ['openElement', [...actionArgs, elementFrame.mustacheCount, elementFrame.blankChildTextNodes.reverse()]];
elementFrame.actions.push(open);
this.popFrame();
// Propagate the element's frame state to the parent frame
if (elementFrame.mustacheCount > 0) {
parentFrame.mustacheCount++;
}
parentFrame.childTemplateCount += elementFrame.childTemplateCount;
parentFrame.actions.push(...elementFrame.actions);
}
AttrNode(attr) {
if (attr.value.type !== 'TextNode') {
this.currentFrame.mustacheCount++;
}
}
TextNode(text) {
let frame = this.currentFrame;
if (text.chars === '') {
frame.blankChildTextNodes.push(domIndexOf(frame.children, text));
}
frame.actions.push(['text', [text, frame.childIndex, frame.childCount]]);
}
BlockStatement(node) {
let frame = this.currentFrame;
frame.mustacheCount++;
frame.actions.push(['block', [node, frame.childIndex, frame.childCount]]);
if (node.inverse) {
this.visit(node.inverse);
}
if (node.program) {
this.visit(node.program);
}
}
PartialStatement(node) {
let frame = this.currentFrame;
frame.mustacheCount++;
frame.actions.push(['mustache', [node, frame.childIndex, frame.childCount]]);
}
CommentStatement(text) {
let frame = this.currentFrame;
frame.actions.push(['comment', [text, frame.childIndex, frame.childCount]]);
}
MustacheCommentStatement() {
// Intentional empty: Handlebars comments should not affect output.
}
MustacheStatement(mustache) {
let frame = this.currentFrame;
frame.mustacheCount++;
frame.actions.push(['mustache', [mustache, frame.childIndex, frame.childCount]]);
}
// Frame helpers
get currentFrame() {
return (0, _util.expect)(this.getCurrentFrame(), "Expected a current frame");
}
getCurrentFrame() {
return this.frameStack[this.frameStack.length - 1];
}
pushFrame() {
let frame = new Frame();
this.frameStack.push(frame);
return frame;
}
popFrame() {
return this.frameStack.pop();
}
}
exports.default = TemplateVisitor; // Returns the index of `domNode` in the `nodes` array, skipping
// over any nodes which do not represent DOM nodes.
function domIndexOf(nodes, domNode) {
let index = -1;
for (let i = 0; i < nodes.length; i++) {
let node = nodes[i];
if (node.type !== 'TextNode' && node.type !== 'ElementNode') {
continue;
} else {
index++;
}
if (node === domNode) {
return index;
}
}
return -1;
}
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{ dict, unreachable, expect } from '@glimmer/util';\nexport class SymbolTable {\n    static top() {\n        return new ProgramSymbolTable();\n    }\n    child(locals) {\n        let symbols = locals.map(name => this.allocate(name));\n        return new BlockSymbolTable(this, locals, symbols);\n    }\n}\nexport class ProgramSymbolTable extends SymbolTable {\n    constructor() {\n        super(...arguments);\n        this.symbols = [];\n        this.size = 1;\n        this.named = dict();\n        this.blocks = dict();\n    }\n    has(_name) {\n        return false;\n    }\n    get(_name) {\n        throw unreachable();\n    }\n    getLocalsMap() {\n        return {};\n    }\n    getEvalInfo() {\n        return [];\n    }\n    allocateNamed(name) {\n        let named = this.named[name];\n        if (!named) {\n            named = this.named[name] = this.allocate(`@${name}`);\n        }\n        return named;\n    }\n    allocateBlock(name) {\n        let block = this.blocks[name];\n        if (!block) {\n            block = this.blocks[name] = this.allocate(`&${name}`);\n        }\n        return block;\n    }\n    allocate(identifier) {\n        this.symbols.push(identifier);\n        return this.size++;\n    }\n}\nexport class BlockSymbolTable extends SymbolTable {\n    constructor(parent, symbols, slots) {\n        super();\n        this.parent = parent;\n        this.symbols = symbols;\n        this.slots = slots;\n    }\n    has(name) {\n        return this.symbols.indexOf(name) !== -1 || this.parent.has(name);\n    }\n    get(name) {\n        let slot = this.symbols.indexOf(name);\n        return slot === -1 ? this.parent.get(name) : this.slots[slot];\n    }\n    getLocalsMap() {\n        let dict = this.parent.getLocalsMap();\n        this.symbols.forEach(symbol => dict[symbol] = this.get(symbol));\n        return dict;\n    }\n    getEvalInfo() {\n        let locals = this.getLocalsMap();\n        return Object.keys(locals).map(symbol => locals[symbol]);\n    }\n    allocateNamed(name) {\n        return this.parent.allocateNamed(name);\n    }\n    allocateBlock(name) {\n        return this.parent.allocateBlock(name);\n    }\n    allocate(identifier) {\n        return this.parent.allocate(identifier);\n    }\n}\n/**\n * Takes in an AST and outputs a list of actions to be consumed\n * by a compiler. For example, the template\n *\n *     foo{{bar}}<div>baz</div>\n *\n * produces the actions\n *\n *     [['startProgram', [programNode, 0]],\n *      ['text', [textNode, 0, 3]],\n *      ['mustache', [mustacheNode, 1, 3]],\n *      ['openElement', [elementNode, 2, 3, 0]],\n *      ['text', [textNode, 0, 1]],\n *      ['closeElement', [elementNode, 2, 3],\n *      ['endProgram', [programNode]]]\n *\n * This visitor walks the AST depth first and backwards. As\n * a result the bottom-most child template will appear at the\n * top of the actions list whereas the root template will appear\n * at the bottom of the list. For example,\n *\n *     <div>{{#if}}foo{{else}}bar<b></b>{{/if}}</div>\n *\n * produces the actions\n *\n *     [['startProgram', [programNode, 0]],\n *      ['text', [textNode, 0, 2, 0]],\n *      ['openElement', [elementNode, 1, 2, 0]],\n *      ['closeElement', [elementNode, 1, 2]],\n *      ['endProgram', [programNode]],\n *      ['startProgram', [programNode, 0]],\n *      ['text', [textNode, 0, 1]],\n *      ['endProgram', [programNode]],\n *      ['startProgram', [programNode, 2]],\n *      ['openElement', [elementNode, 0, 1, 1]],\n *      ['block', [blockNode, 0, 1]],\n *      ['closeElement', [elementNode, 0, 1]],\n *      ['endProgram', [programNode]]]\n *\n * The state of the traversal is maintained by a stack of frames.\n * Whenever a node with children is entered (either a ProgramNode\n * or an ElementNode) a frame is pushed onto the stack. The frame\n * contains information about the state of the traversal of that\n * node. For example,\n *\n *   - index of the current child node being visited\n *   - the number of mustaches contained within its child nodes\n *   - the list of actions generated by its child nodes\n */\nclass Frame {\n    constructor() {\n        this.parentNode = null;\n        this.children = null;\n        this.childIndex = null;\n        this.childCount = null;\n        this.childTemplateCount = 0;\n        this.mustacheCount = 0;\n        this.actions = [];\n        this.blankChildTextNodes = null;\n        this.symbols = null;\n    }\n}\nexport default class TemplateVisitor {\n    constructor() {\n        this.frameStack = [];\n        this.actions = [];\n        this.programDepth = -1;\n    }\n    visit(node) {\n        this[node.type](node);\n    }\n    // Traversal methods\n    Program(program) {\n        this.programDepth++;\n        let parentFrame = this.getCurrentFrame();\n        let programFrame = this.pushFrame();\n        if (!parentFrame) {\n            program['symbols'] = SymbolTable.top();\n        } else {\n            program['symbols'] = parentFrame.symbols.child(program.blockParams);\n        }\n        let startType, endType;\n        if (this.programDepth === 0) {\n            startType = 'startProgram';\n            endType = 'endProgram';\n        } else {\n            startType = 'startBlock';\n            endType = 'endBlock';\n        }\n        programFrame.parentNode = program;\n        programFrame.children = program.body;\n        programFrame.childCount = program.body.length;\n        programFrame.blankChildTextNodes = [];\n        programFrame.actions.push([endType, [program, this.programDepth]]);\n        programFrame.symbols = program['symbols'];\n        for (let i = program.body.length - 1; i >= 0; i--) {\n            programFrame.childIndex = i;\n            this.visit(program.body[i]);\n        }\n        programFrame.actions.push([startType, [program, programFrame.childTemplateCount, programFrame.blankChildTextNodes.reverse()]]);\n        this.popFrame();\n        this.programDepth--;\n        // Push the completed template into the global actions list\n        if (parentFrame) {\n            parentFrame.childTemplateCount++;\n        }\n        this.actions.push(...programFrame.actions.reverse());\n    }\n    ElementNode(element) {\n        let parentFrame = this.currentFrame;\n        let elementFrame = this.pushFrame();\n        elementFrame.parentNode = element;\n        elementFrame.children = element.children;\n        elementFrame.childCount = element.children.length;\n        elementFrame.mustacheCount += element.modifiers.length;\n        elementFrame.blankChildTextNodes = [];\n        elementFrame.symbols = element['symbols'] = parentFrame.symbols.child(element.blockParams);\n        let actionArgs = [element, parentFrame.childIndex, parentFrame.childCount];\n        elementFrame.actions.push(['closeElement', actionArgs]);\n        for (let i = element.attributes.length - 1; i >= 0; i--) {\n            this.visit(element.attributes[i]);\n        }\n        for (let i = element.children.length - 1; i >= 0; i--) {\n            elementFrame.childIndex = i;\n            this.visit(element.children[i]);\n        }\n        let open = ['openElement', [...actionArgs, elementFrame.mustacheCount, elementFrame.blankChildTextNodes.reverse()]];\n        elementFrame.actions.push(open);\n        this.popFrame();\n        // Propagate the element's frame state to the parent frame\n        if (elementFrame.mustacheCount > 0) {\n            parentFrame.mustacheCount++;\n        }\n        parentFrame.childTemplateCount += elementFrame.childTemplateCount;\n        parentFrame.actions.push(...elementFrame.actions);\n    }\n    AttrNode(attr) {\n        if (attr.value.type !== 'TextNode') {\n            this.currentFrame.mustacheCount++;\n        }\n    }\n\n    TextNode(text) {\n        let frame = this.currentFrame;\n        if (text.chars === '') {\n            frame.blankChildTextNodes.push(domIndexOf(frame.children, text));\n        }\n        frame.actions.push(['text', [text, frame.childIndex, frame.childCount]]);\n    }\n\n    BlockStatement(node) {\n        let frame = this.currentFrame;\n        frame.mustacheCount++;\n        frame.actions.push(['block', [node, frame.childIndex, frame.childCount]]);\n        if (node.inverse) {\n            this.visit(node.inverse);\n        }\n        if (node.program) {\n            this.visit(node.program);\n        }\n    }\n\n    PartialStatement(node) {\n        let frame = this.currentFrame;\n        frame.mustacheCount++;\n        frame.actions.push(['mustache', [node, frame.childIndex, frame.childCount]]);\n    }\n\n    CommentStatement(text) {\n        let frame = this.currentFrame;\n        frame.actions.push(['comment', [text, frame.childIndex, frame.childCount]]);\n    }\n\n    MustacheCommentStatement() {\n        // Intentional empty: Handlebars comments should not affect output.\n    }\n\n    MustacheStatement(mustache) {\n        let frame = this.currentFrame;\n        frame.mustacheCount++;\n        frame.actions.push(['mustache', [mustache, frame.childIndex, frame.childCount]]);\n    }\n\n    // Frame helpers\n    get currentFrame() {\n        return expect(this.getCurrentFrame(), \"Expected a current frame\");\n    }\n    getCurrentFrame() {\n        return this.frameStack[this.frameStack.length - 1];\n    }\n    pushFrame() {\n        let frame = new Frame();\n        this.frameStack.push(frame);\n        return frame;\n    }\n    popFrame() {\n        return this.frameStack.pop();\n    }\n}\n// Returns the index of `domNode` in the `nodes` array, skipping\n// over any nodes which do not represent DOM nodes.\nfunction domIndexOf(nodes, domNode) {\n    let index = -1;\n    for (let i = 0; i < nodes.length; i++) {\n        let node = nodes[i];\n        if (node.type !== 'TextNode' && node.type !== 'ElementNode') {\n            continue;\n        } else {\n            index++;\n        }\n        if (node === domNode) {\n            return index;\n        }\n    }\n    return -1;\n}"]}