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[IMP] qweb: implements an expression evaluator

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closes #5
This commit is contained in:
Géry Debongnie
2019-06-04 16:21:31 +02:00
parent 438b21df3f
commit 7b887447da
8 changed files with 494 additions and 131 deletions
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doc/qweb.md
+11 -5
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@@ -175,9 +175,15 @@ root nodes.
### Expression evaluation
It is useful to explain the various rules that applies on QWeb expressions. These
expressions are strings that will be converted to a javascript expression at
compile time.
QWeb expressions are strings that will be processed at compile time. Each variable in
the javascript expression will be replaced by a lookup in the context (so, the
widget). For example, `a + b.c(d)` will be converted into:
```js
context['a'] + context['b'].c(context['d'])
```
It is useful to explain the various rules that applies on these expressions:
1. it should be a simple expression which returns a value. It cannot be a statement.
@@ -191,10 +197,10 @@ compile time.
<div><p t-if="console.log(1)">NOT valid</p></div>
```
2. it can use anything in the rendering context:
2. it can use anything in the rendering context (typically, the component):
```xml
<p t-if="user.birthday == today()">Happy bithday!</p>
<p t-if="user.birthday === today()">Happy bithday!</p>
```
is valid, and will read the `user` object from the context, and call the
src/qweb_core.ts
+9 -79
View File
@@ -1,4 +1,5 @@
import { VNode, h } from "./vdom";
import { QWebVar, compileExpr } from "./qweb_expressions";
/**
* Owl QWeb Engine
@@ -56,18 +57,6 @@ export interface Directive {
//------------------------------------------------------------------------------
// Const/global stuff/helpers
//------------------------------------------------------------------------------
const RESERVED_WORDS = "true,false,NaN,null,undefined,debugger,console,window,in,instanceof,new,function,return,this,typeof,eval,void,Math,RegExp,Array,Object,Date".split(
","
);
const WORD_REPLACEMENT = {
and: "&&",
or: "||",
gt: ">",
gte: ">=",
lt: "<",
lte: "<="
};
const DISABLED_TAGS = [
"input",
@@ -624,16 +613,6 @@ export class QWeb {
//------------------------------------------------------------------------------
// Compilation Context
//------------------------------------------------------------------------------
export interface QWebExprVar {
id: string;
expr: string;
}
export interface QWebXMLVar {
xml: NodeList;
}
export type QWebVar = QWebExprVar | QWebXMLVar;
export class Context {
nextID: number = 1;
@@ -713,63 +692,14 @@ export class Context {
return val in this.variables ? this.getValue(this.variables[val]) : val;
}
formatExpression(e: string): string {
e = e.trim();
if (e[0] === "{" && e[e.length - 1] === "}") {
const innerExpr = e
.slice(1, -1)
.split(",")
.map(p => {
let [key, val] = p.trim().split(":");
if (key === "") {
return "";
}
if (!val) {
val = key;
}
return `${key}: ${this.formatExpression(val)}`;
})
.join(",");
return "{" + innerExpr + "}";
}
// Thanks CHM for this code...
const chars = e.split("");
let instring = "";
let invar = "";
let invarPos = 0;
let r = "";
chars.push(" ");
for (let i = 0, ilen = chars.length; i < ilen; i++) {
let c = chars[i];
if (instring.length) {
if (c === instring && chars[i - 1] !== "\\") {
instring = "";
}
} else if (c === '"' || c === "'") {
instring = c;
} else if (c.match(/[a-zA-Z_\$]/) && !invar.length) {
invar = c;
invarPos = i;
continue;
} else if (c.match(/\W/) && invar.length) {
// TODO: Should check for possible spaces before dot
if (chars[invarPos - 1] !== "." && RESERVED_WORDS.indexOf(invar) < 0) {
invar =
WORD_REPLACEMENT[invar] ||
(this.variables[invar] && (<any>this.variables[invar]).id) ||
"context['" + invar + "']";
}
r += invar;
invar = "";
} else if (invar.length) {
invar += c;
continue;
}
r += c;
}
const result = r.slice(0, -1);
return result;
/**
* Prepare an expression for being consumed at render time. Its main job
* is to
* - replace unknown variables by a lookup in the context
* - replace already defined variables by their internal name
*/
formatExpression(expr: string): string {
return compileExpr(expr, this.variables);
}
/**
src/qweb_directives.ts
+2 -1
View File
@@ -1,4 +1,5 @@
import { Context, QWeb, UTILS, QWebExprVar } from "./qweb_core";
import { Context, QWeb, UTILS } from "./qweb_core";
import { QWebExprVar } from "./qweb_expressions";
/**
* Owl QWeb Directives
src/qweb_expressions.ts
+270
View File
@@ -0,0 +1,270 @@
/**
* Owl QWeb Expression Parser
*
* Owl needs in various contexts to be able to understand the structure of a
* string representing a javascript expression. The usual goal is to be able
* to rewrite some variables. For example, if a template has
*
* ```xml
* <t t-if="computeSomething({val: state.val})">...</t>
* ```
*
* this needs to be translated in something like this:
*
* ```js
* if (context["computeSomething"]({val: context["state"].val})) { ... }
* ```
*
* This file contains the implementation of an extremely naive tokenizer/parser
* and evaluator for javascript expressions. The supported grammar is basically
* only expressive enough to understand the shape of objects, of arrays, and
* various operators.
*/
//------------------------------------------------------------------------------
// Misc types, constants and helpers
//------------------------------------------------------------------------------
const RESERVED_WORDS = "true,false,NaN,null,undefined,debugger,console,window,in,instanceof,new,function,return,this,typeof,eval,void,Math,RegExp,Array,Object,Date".split(
","
);
const WORD_REPLACEMENT = {
and: "&&",
or: "||",
gt: ">",
gte: ">=",
lt: "<",
lte: "<="
};
export interface QWebExprVar {
id: string;
expr: string;
}
export interface QWebXMLVar {
xml: NodeList;
}
export type QWebVar = QWebExprVar | QWebXMLVar;
//------------------------------------------------------------------------------
// Tokenizer
//------------------------------------------------------------------------------
type TKind =
| "LEFT_BRACE"
| "RIGHT_BRACE"
| "LEFT_BRACKET"
| "RIGHT_BRACKET"
| "LEFT_PAREN"
| "RIGHT_PAREN"
| "COMMA"
| "VALUE"
| "SYMBOL"
| "OPERATOR"
| "COLON";
interface Token {
type: TKind;
value: string;
size?: number;
}
const STATIC_TOKEN_MAP: { [key: string]: TKind } = {
"{": "LEFT_BRACE",
"}": "RIGHT_BRACE",
"[": "LEFT_BRACKET",
"]": "RIGHT_BRACKET",
":": "COLON",
",": "COMMA",
"(": "LEFT_PAREN",
")": "RIGHT_PAREN"
};
const OPERATORS = [".", "===", "==", "+", "!", "||", "&&", ">", "?", "-", "*"];
type Tokenizer = (expr: string) => Token | false;
let tokenizeString: Tokenizer = function(expr) {
let s = expr[0];
let start = s;
if (s !== "'" && s !== '"') {
return false;
}
let i = 1;
let cur;
while (expr[i] && expr[i] !== start) {
cur = expr[i];
s += cur;
if (cur === "\\") {
i++;
cur = expr[i];
if (!cur) {
throw new Error("Invalid expression");
}
s += cur;
}
i++;
}
if (expr[i] !== start) {
throw new Error("Invalid expression");
}
s += start;
return { type: "VALUE", value: s };
};
let tokenizeNumber: Tokenizer = function(expr) {
let s = expr[0];
if (s && s.match(/[0-9]/)) {
let i = 1;
while (expr[i] && expr[i].match(/[0-9]|\./)) {
s += expr[i];
i++;
}
return { type: "VALUE", value: s };
} else {
return false;
}
};
let tokenizeSymbol: Tokenizer = function(expr) {
let s = expr[0];
if (s && s.match(/[a-zA-Z_\$]/)) {
let i = 1;
while (expr[i] && expr[i].match(/\w/)) {
s += expr[i];
i++;
}
if (s in WORD_REPLACEMENT) {
return { type: "OPERATOR", value: WORD_REPLACEMENT[s], size: s.length };
}
return { type: "SYMBOL", value: s };
} else {
return false;
}
};
const tokenizeStatic: Tokenizer = function(expr) {
const char = expr[0];
if (char && char in STATIC_TOKEN_MAP) {
return { type: STATIC_TOKEN_MAP[char], value: char };
}
return false;
};
const tokenizeOperator: Tokenizer = function(expr) {
for (let op of OPERATORS) {
if (expr.startsWith(op)) {
return { type: "OPERATOR", value: op };
}
}
return false;
};
const TOKENIZERS = [
tokenizeString,
tokenizeNumber,
tokenizeSymbol,
tokenizeStatic,
tokenizeOperator
];
/**
* Convert a javascript expression (as a string) into a list of tokens. For
* example: `tokenize("1 + b")` will return:
* ```js
* [
* {type: "VALUE", value: "1"},
* {type: "OPERATOR", value: "+"},
* {type: "SYMBOL", value: "b"}
* ]
* ```
*/
export function tokenize(expr: string): Token[] {
const result: Token[] = [];
let token: boolean | Token = true;
while (token) {
expr = expr.trim();
if (expr) {
for (let tokenizer of TOKENIZERS) {
token = tokenizer(expr);
if (token) {
result.push(token);
expr = expr.slice(token.size || token.value.length);
break;
}
}
} else {
token = false;
}
}
if (expr.length) {
throw new Error("Tokenizer error...");
}
return result;
}
//------------------------------------------------------------------------------
// Expression "evaluator"
//------------------------------------------------------------------------------
/**
* This is the main function exported by this file. This is the code that will
* process an expression (given as a string) and returns another expression with
* proper lookups in the context.
*
* Usually, this kind of code would be very simple to do if we had an AST (so,
* if we had a javascript parser), since then, we would only need to find the
* variables and replace them. However, a parser is more complicated, and there
* are no standard builtin parser API.
*
* Since this method is applied to simple javasript expressions, and the work to
* be done is actually quite simple, we actually can get away with not using a
* parser, which helps with the code size.
*
* Here is the heuristic used by this method to determine if a token is a
* variable:
* - by default, all symbols are considered a variable
* - unless the previous token is a dot (in that case, this is a property: `a.b`)
* - or if the previous token is a left brace or a comma, and the next token is
* a colon (in that case, this is an object key: `{a: b}`)
*/
export function compileExpr(
expr: string,
vars: { [key: string]: QWebVar }
): string {
const tokens = tokenize(expr);
let result = "";
for (let i = 0; i < tokens.length; i++) {
let token = tokens[i];
if (token.type === "SYMBOL" && !RESERVED_WORDS.includes(token.value)) {
// we need to find if it is a variable
let isVar = true;
let prevToken = tokens[i - 1];
if (prevToken) {
if (prevToken.type === "OPERATOR" && prevToken.value === ".") {
isVar = false;
} else if (
prevToken.type === "LEFT_BRACE" ||
prevToken.type === "COMMA"
) {
let nextToken = tokens[i + 1];
if (nextToken && nextToken.type === "COLON") {
isVar = false;
}
}
}
if (isVar) {
if (token.value in vars && "id" in vars[token.value]) {
token.value = (<QWebExprVar>vars[token.value]).id;
} else {
token.value = `context['${token.value}']`;
}
}
}
result += token.value;
}
return result;
}
tests/__snapshots__/component.test.ts.snap
+2 -2
View File
@@ -54,7 +54,7 @@ exports[`class and style attributes with t-widget t-att-class is properly added/
let _2_index = c1.length;
c1.push(null);
let def3;
const _5 = {a: context['state'].a,b: context['state'].b};
const _5 = {a:context['state'].a,b:context['state'].b};
let w4 = 4 in context.__owl__.cmap ? context.__owl__.children[context.__owl__.cmap[4]] : false;
let props4 = {};
if (w4 && w4.__owl__.renderPromise && !w4.__owl__.vnode) {
@@ -373,7 +373,7 @@ exports[`other directives with t-widget t-on with handler bound to object 1`] =
w4 = new W4(owner, props4);
context.__owl__.cmap[4] = w4.__owl__.id;
def3 = w4._prepare();
def3 = def3.then(vnode=>{vnode.data.hook = {create(_, vn){vn.elm.addEventListener('ev', owner['onEv'].bind(owner, {val: 3}));}};let pvnode=h(vnode.sel, {key: 4, hook: {insert(vn) {let nvn=w4._mount(vnode, pvnode.elm);pvnode.elm=nvn.elm;},remove() {},destroy(vn) {w4.destroy();}}});c1[_2_index]=pvnode;w4.__owl__.pvnode = pvnode;});
def3 = def3.then(vnode=>{vnode.data.hook = {create(_, vn){vn.elm.addEventListener('ev', owner['onEv'].bind(owner, {val:3}));}};let pvnode=h(vnode.sel, {key: 4, hook: {insert(vn) {let nvn=w4._mount(vnode, pvnode.elm);pvnode.elm=nvn.elm;},remove() {},destroy(vn) {w4.destroy();}}});c1[_2_index]=pvnode;w4.__owl__.pvnode = pvnode;});
} else {
def3 = def3 || w4._updateProps(props4, extra.forceUpdate, extra.patchQueue);
def3 = def3.then(()=>{if (w4.__owl__.isDestroyed) {return};let pvnode=w4.__owl__.pvnode;c1[_2_index]=pvnode;});
tests/__snapshots__/qweb.test.ts.snap
+26 -26
View File
@@ -4,7 +4,7 @@ exports[`attributes class and t-attf-class with ternary operation 1`] = `
"function anonymous(context,extra
) {
var h = this.utils.h;
var _1 = 'hello ' + (context['value'] ? 'world' : '');
var _1 = 'hello ' + (context['value']?'world':'');
let c2 = [], p2 = {key:2,attrs:{class: _1}};
var vn2 = h('div', p2, c2);
return vn2;
@@ -70,7 +70,7 @@ exports[`attributes format expression 1`] = `
"function anonymous(context,extra
) {
var h = this.utils.h;
var _1 = (context['value'] + 37);
var _1 = (context['value']+37);
let c2 = [], p2 = {key:2,attrs:{foo: _1}};
var vn2 = h('div', p2, c2);
return vn2;
@@ -81,7 +81,7 @@ exports[`attributes format expression, other format 1`] = `
"function anonymous(context,extra
) {
var h = this.utils.h;
var _1 = (context['value'] + 37);
var _1 = (context['value']+37);
let c2 = [], p2 = {key:2,attrs:{foo: _1}};
var vn2 = h('div', p2, c2);
return vn2;
@@ -127,7 +127,7 @@ exports[`attributes from object variables set previously 1`] = `
var h = this.utils.h;
let c1 = [], p1 = {key:1};
var vn1 = h('div', p1, c1);
var _2 = {a: 'b'};
var _2 = {a:'b'};
var _3 = _2.a;
let c4 = [], p4 = {key:4,attrs:{class: _3}};
var vn4 = h('span', p4, c4);
@@ -223,7 +223,7 @@ exports[`attributes t-att-class with object 1`] = `
) {
var h = this.utils.h;
var _1 = 'static';
var _3 = this.utils.objectToAttrString({a: context['b'],c: context['d'],e: context['f']});
var _3 = this.utils.objectToAttrString({a:context['b'],c:context['d'],e:context['f']});
var _2 = 'static' + (_3 ? ' ' + _3 : '');
let c4 = [], p4 = {key:4,attrs:{class: _2}};
var vn4 = h('div', p4, c4);
@@ -246,7 +246,7 @@ exports[`attributes tuple literal 1`] = `
"function anonymous(context,extra
) {
var h = this.utils.h;
var _1 = ['foo', 'bar'];
var _1 = ['foo','bar'];
let c2 = [], p2 = {key:2,attrs:{}};
if (_1 instanceof Array) {
p2.attrs[_1[0]] = _1[1];
@@ -303,7 +303,7 @@ exports[`debugging t-log 1`] = `
let c1 = [], p1 = {key:1};
var vn1 = h('div', p1, c1);
var _2 = 42;
console.log(_2 + 3)
console.log(_2+3)
return vn1;
}"
`;
@@ -345,7 +345,7 @@ exports[`foreach iterate on items (on a element node) 1`] = `
var h = this.utils.h;
let c1 = [], p1 = {key:1};
var vn1 = h('div', p1, c1);
var _2 = [1, 2];
var _2 = [1,2];
if (!_2) { throw new Error('QWeb error: Invalid loop expression')}
var _3 = _4 = _2;
if (!(_2 instanceof Array)) {
@@ -378,7 +378,7 @@ exports[`foreach iterate on items 1`] = `
var h = this.utils.h;
let c1 = [], p1 = {key:1};
var vn1 = h('div', p1, c1);
var _2 = [3, 2, 1];
var _2 = [3,2,1];
if (!_2) { throw new Error('QWeb error: Invalid loop expression')}
var _3 = _4 = _2;
if (!(_2 instanceof Array)) {
@@ -501,7 +501,7 @@ exports[`foreach warn if no key in some case 1`] = `
var h = this.utils.h;
let c1 = [], p1 = {key:1};
var vn1 = h('div', p1, c1);
var _2 = [1, 2];
var _2 = [1,2];
if (!_2) { throw new Error('QWeb error: Invalid loop expression')}
var _3 = _4 = _2;
if (!(_2 instanceof Array)) {
@@ -910,13 +910,13 @@ exports[`t-if boolean value condition elif 1`] = `
var h = this.utils.h;
let c1 = [], p1 = {key:1};
var vn1 = h('div', p1, c1);
if (context['color'] == 'black') {
if (context['color']=='black') {
c1.push({text: \`black pearl\`});
}
else if (context['color'] == 'yellow') {
else if (context['color']=='yellow') {
c1.push({text: \`yellow submarine\`});
}
else if (context['color'] == 'red') {
else if (context['color']=='red') {
c1.push({text: \`red is dead\`});
}
else {
@@ -1019,28 +1019,28 @@ exports[`t-if can use some boolean operators in expressions 1`] = `
var h = this.utils.h;
let c1 = [], p1 = {key:1};
var vn1 = h('div', p1, c1);
if (context['cond1'] && context['cond2']) {
if (context['cond1']&&context['cond2']) {
c1.push({text: \`and\`});
}
if (context['cond1'] && context['cond3']) {
if (context['cond1']&&context['cond3']) {
c1.push({text: \`nope\`});
}
if (context['cond1'] || context['cond3']) {
if (context['cond1']||context['cond3']) {
c1.push({text: \`or\`});
}
if (context['cond3'] || context['cond4']) {
if (context['cond3']||context['cond4']) {
c1.push({text: \`nope\`});
}
if (context['m'] > 3) {
if (context['m']>3) {
c1.push({text: \`mgt\`});
}
if (context['n'] > 3) {
if (context['n']>3) {
c1.push({text: \`ngt\`});
}
if (context['m'] < 3) {
if (context['m']<3) {
c1.push({text: \`mlt\`});
}
if (context['n'] < 3) {
if (context['n']<3) {
c1.push({text: \`nlt\`});
}
return vn1;
@@ -1209,7 +1209,7 @@ exports[`t-on can bind handlers with object arguments 1`] = `
if (!context['add']) {
throw new Error('Missing handler \\\\'' + 'add' + \`\\\\' when evaluating template 'test'\`)
}
p1.on['click'] = context['add'].bind(owner, {val: 5});
p1.on['click'] = context['add'].bind(owner, {val:5});
c1.push({text: \`Click\`});
return vn1;
}"
@@ -1536,7 +1536,7 @@ exports[`t-set evaluate value expression 1`] = `
var h = this.utils.h;
let c1 = [], p1 = {key:1};
var vn1 = h('div', p1, c1);
var _2 = 1 + 2;
var _2 = 1+2;
if (_2 || _2 === 0) {
c1.push({text: _2});
}
@@ -1550,7 +1550,7 @@ exports[`t-set evaluate value expression, part 2 1`] = `
var h = this.utils.h;
let c1 = [], p1 = {key:1};
var vn1 = h('div', p1, c1);
var _2 = context['somevariable'] + 2;
var _2 = context['somevariable']+2;
if (_2 || _2 === 0) {
c1.push({text: _2});
}
@@ -1626,7 +1626,7 @@ exports[`t-set t-set and t-if 1`] = `
let c1 = [], p1 = {key:1};
var vn1 = h('div', p1, c1);
var _2 = context['value'];
if (_2 === 'ok') {
if (_2==='ok') {
c1.push({text: \`grimbergen\`});
}
return vn1;
@@ -1639,7 +1639,7 @@ exports[`t-set t-set evaluates an expression only once 1`] = `
var h = this.utils.h;
let c1 = [], p1 = {key:1};
var vn1 = h('div', p1, c1);
var _2 = context['value'] + ' artois';
var _2 = context['value']+' artois';
if (_2 || _2 === 0) {
c1.push({text: _2});
}
tests/qweb.test.ts
+4 -18
View File
@@ -84,23 +84,6 @@ describe("error handling", () => {
).toThrow("Missing event name with t-on directive");
});
test("error when compiled code is invalid", () => {
const consoleWarn = console.warn;
const consoleGroupCollapsed = console.groupCollapsed;
console.warn = jest.fn();
console.groupCollapsed = jest.fn();
qweb.addTemplate(
"templatename",
`<div t-att-hey="}/^function invalid{{>'"></div>`
);
expect(() => qweb.render("templatename")).toThrow(
"Invalid generated code while compiling template 'templatename': Unexpected token }"
);
expect(console.warn).toBeCalledTimes(1);
console.warn = consoleWarn;
console.groupCollapsed = consoleGroupCollapsed;
});
test("error when unknown directive", () => {
qweb.addTemplate(
"templatename",
@@ -530,7 +513,10 @@ describe("attributes", () => {
});
test("class and t-attf-class with ternary operation", () => {
qweb.addTemplate("test", `<div class="hello" t-attf-class="{{value ? 'world' : ''}}"/>`);
qweb.addTemplate(
"test",
`<div class="hello" t-attf-class="{{value ? 'world' : ''}}"/>`
);
const result = renderToString(qweb, "test", { value: true });
expect(result).toBe(`<div class="hello world"></div>`);
});
tests/qweb_expressions.test.ts
+170
View File
@@ -0,0 +1,170 @@
import { compileExpr, tokenize } from "../src/qweb_expressions";
describe("tokenizer", () => {
test("simple tokens", () => {
expect(tokenize("1.3")).toEqual([
{ type: "VALUE", value: "1.3" }
]);
expect(tokenize("{}")).toEqual([
{ type: "LEFT_BRACE", value: "{" },
{ type: "RIGHT_BRACE", value: "}" }
]);
expect(tokenize("{ }}")).toEqual([
{ type: "LEFT_BRACE", value: "{" },
{ type: "RIGHT_BRACE", value: "}" },
{ type: "RIGHT_BRACE", value: "}" }
]);
expect(tokenize("a")).toEqual([{ type: "SYMBOL", value: "a" }]);
expect(tokenize("true")).toEqual([{ type: "SYMBOL", value: "true" }]);
expect(tokenize("abcde")).toEqual([{ type: "SYMBOL", value: "abcde" }]);
expect(tokenize("_ab2")).toEqual([{ type: "SYMBOL", value: "_ab2" }]);
expect(tokenize("$ab2")).toEqual([{ type: "SYMBOL", value: "$ab2" }]);
expect(tokenize("ABC")).toEqual([{ type: "SYMBOL", value: "ABC" }]);
expect(tokenize("{a: 2}")).toEqual([
{ type: "LEFT_BRACE", value: "{" },
{ type: "SYMBOL", value: "a" },
{ type: "COLON", value: ":" },
{ type: "VALUE", value: "2" },
{ type: "RIGHT_BRACE", value: "}" }
]);
expect(tokenize("a,")).toEqual([
{ type: "SYMBOL", value: "a" },
{ type: "COMMA", value: "," }
]);
expect(tokenize("][")).toEqual([
{ type: "RIGHT_BRACKET", value: "]" },
{ type: "LEFT_BRACKET", value: "[" }
]);
});
test("strings", () => {
expect(() => tokenize("'")).toThrow("Invalid expression");
expect(() => tokenize("'\\")).toThrow("Invalid expression");
expect(() => tokenize("'\\'")).toThrow("Invalid expression");
expect(tokenize("'hello ged'")).toEqual([
{ type: "VALUE", value: "'hello ged'" }
]);
expect(tokenize("'hello \\'ged\\''")).toEqual([
{ type: "VALUE", value: "'hello \\'ged\\''" }
]);
expect(() => tokenize('"')).toThrow("Invalid expression");
expect(() => tokenize('"\\"')).toThrow("Invalid expression");
expect(tokenize('"hello ged"')).toEqual([
{ type: "VALUE", value: '"hello ged"' }
]);
expect(tokenize('"hello ged"}')).toEqual([
{ type: "VALUE", value: '"hello ged"' },
{ type: "RIGHT_BRACE", value: "}" }
]);
expect(tokenize('"hello \\"ged\\""')).toEqual([
{ type: "VALUE", value: '"hello \\"ged\\""' }
]);
});
});
describe("expression evaluation", () => {
test("simple static values", () => {
expect(compileExpr("1", {})).toBe("1");
expect(compileExpr("1 ", {})).toBe("1");
expect(compileExpr("'some string#/, {' ", {})).toBe("'some string#/, {'");
expect(compileExpr("{ } ", {})).toBe("{}");
expect(compileExpr("{a: 1} ", {})).toBe("{a:1}");
expect(compileExpr("{a: 1, b: 2 } ", {})).toBe("{a:1,b:2}");
expect(compileExpr("[] ", {})).toBe("[]");
expect(compileExpr("[1] ", {})).toBe("[1]");
expect(compileExpr("['1', '2'] ", {})).toBe("['1','2']");
expect(compileExpr("['1', \"2\"] ", {})).toBe("['1',\"2\"]");
});
test("various types of 'words'", () => {
expect(compileExpr("true", {})).toBe("true");
expect(compileExpr("false", {})).toBe("false");
expect(compileExpr("debugger", {})).toBe("debugger");
});
test("parenthesis", () => {
expect(compileExpr("(1)", {})).toBe("(1)");
expect(compileExpr("a*(1 +3)", {})).toBe("context['a']*(1+3)");
});
test("objects and sub objects", () => {
expect(compileExpr("{a:{b:1}} ", {})).toBe("{a:{b:1}}");
});
test("replacing variables", () => {
expect(compileExpr("a", {})).toBe("context['a']");
expect(compileExpr("a", { a: { id: "_3", expr: "" } })).toBe("_3");
});
test("arrays and objects", () => {
expect(compileExpr("[{b:1}] ", {})).toBe("[{b:1}]");
expect(compileExpr("{a: []} ", {})).toBe("{a:[]}");
expect(compileExpr("[{b:1, c: [1, {d: {e: 3}} ]}] ", {})).toBe(
"[{b:1,c:[1,{d:{e:3}}]}]"
);
});
test("dot operator", () => {
expect(compileExpr("a.b", {})).toBe("context['a'].b");
expect(compileExpr("a.b.c", {})).toBe("context['a'].b.c");
});
test("various unary operators", () => {
expect(compileExpr("!flag", {})).toBe("!context['flag']");
expect(compileExpr("-3", {})).toBe("-3");
expect(compileExpr("-a", {})).toBe("-context['a']");
});
test("various binary operators", () => {
expect(compileExpr("color == 'black'", {})).toBe(
"context['color']=='black'"
);
expect(compileExpr("a || b", {})).toBe("context['a']||context['b']");
expect(compileExpr("color === 'black'", {})).toBe(
"context['color']==='black'"
);
expect(compileExpr("'li_'+item", {})).toBe("'li_'+context['item']");
expect(compileExpr("state.val > 1", {})).toBe("context['state'].val>1");
});
test("boolean operations", () => {
expect(compileExpr("a && b", {})).toBe("context['a']&&context['b']");
});
test("ternary operators", () => {
expect(compileExpr("a ? b: '2'", {})).toBe("context['a']?context['b']:'2'");
expect(compileExpr("a ? b: (c or '2') ", {})).toBe(
"context['a']?context['b']:(context['c']||'2')"
);
expect(compileExpr("a ? {test:c}: [1,u]", {})).toBe(
"context['a']?{test:context['c']}:[1,context['u']]"
);
});
test("word replacement", () => {
expect(compileExpr("a or b", {})).toBe("context['a']||context['b']");
expect(compileExpr("a and b", {})).toBe("context['a']&&context['b']");
});
test("function calls", () => {
expect(compileExpr("a()", {})).toBe("context['a']()");
expect(compileExpr("a(1)", {})).toBe("context['a'](1)");
expect(compileExpr("a(1,2)", {})).toBe("context['a'](1,2)");
expect(compileExpr("a(1,2,{a:[a]})", {})).toBe(
"context['a'](1,2,{a:[context['a']]})"
);
expect(compileExpr("'x'.toUpperCase()", {})).toBe("'x'.toUpperCase()");
expect(compileExpr("'x'.toUpperCase({a: 3})", {})).toBe(
"'x'.toUpperCase({a:3})"
);
expect(
compileExpr("'x'.toUpperCase(a)", { a: { id: "_v5", expr: "" } })
).toBe("'x'.toUpperCase(_v5)");
expect(
compileExpr("'x'.toUpperCase({b: a})", { a: { id: "_v5", expr: "" } })
).toBe("'x'.toUpperCase({b:_v5})");
});
});