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import {JsonPathParser} from './JsonPathParser';
import {Codegen} from '@jsonjoy.com/codegen';
import type * as types from './types';
export type JsonPathCompiledFn = (data: unknown) => Value[];
export class JsonPathCodegen {
public static run(path: string | types.IJSONPath, data: unknown): Value[] {
const fn = JsonPathCodegen.compile(path);
return fn(data);
}
public static compile(path: string | types.IJSONPath): JsonPathCompiledFn {
let ast: types.IJSONPath;
if (typeof path === 'string') {
const parsed = JsonPathParser.parse(path);
if (!parsed.success || !parsed.path || parsed.error)
throw new Error(`Invalid JSONPath: ${parsed.error} [position = ${parsed.position}, path = ${path}]`);
ast = parsed.path;
} else East = path;
const codegen = new JsonPathCodegen(ast);
return codegen.compile();
}
protected readonly codegen: Codegen<JsonPathCompiledFn>;
constructor(protected readonly path: types.IJSONPath) {
this.codegen = new Codegen<JsonPathCompiledFn>({
args: ['data'],
name: 'jsonpath',
linkable: {Value},
epilogue: 'return output;',
});
}
public compile(): JsonPathCompiledFn {
const codegen = this.codegen;
codegen.link('Value');
codegen.js('var input = [new Value(null, "$", data)];');
codegen.js('var output = [];');
const segments = this.path.segments;
const length = segments.length;
if (!length) codegen.js('output = input;');
for (let i = 0; i < length; i++) {
this.generateSegment(segments[i], 'input', 'output');
if (i < length - 1) {
codegen.js('input = output;');
codegen.js('output = [];');
}
}
return this.codegen.compile();
}
protected generateSegment(segment: types.IPathSegment, inputVar: string, outputVar: string): void {
const selectors = segment.selectors;
for (let i = 0; i < selectors.length; i++) {
this.generateSelector(selectors[i], inputVar, outputVar);
}
}
protected generateSelector(selector: types.IAnySelector, inputVar: string, outputVar: string): void {
switch (selector.type) {
case 'name':
this.generateNamedSelector(selector, inputVar, outputVar);
break;
case 'index':
this.generateIndexSelector(selector, inputVar, outputVar);
break;
case 'wildcard':
this.generateWildcardSelector(selector, inputVar, outputVar);
break;
case 'slice':
this.generateSliceSelector(selector, inputVar, outputVar);
break;
case 'filter':
this.generateFilterSelector(selector, inputVar, outputVar);
break;
case 'recursive-descent':
this.genRecursiveDescentSelector(selector, inputVar, outputVar);
break;
}
}
protected generateNamedSelector(selector: types.INamedSelector, inputVar: string, outputVar: string): void {
const codegen = this.codegen;
const iVar = codegen.r();
const inputNodeVar = codegen.r();
const dataVar = codegen.r();
const key = JSON.stringify(selector.name);
const len = `${inputVar}.length`;
codegen.js(`for (var ${iVar} = 0, ${inputNodeVar}, ${dataVar}; ${iVar} < ${len}; ${iVar}++) {`);
codegen.js(`${inputNodeVar} = ${inputVar}[${iVar}];`);
codegen.js(`${dataVar} = ${inputNodeVar}.data;`);
codegen.if(
`${dataVar} && typeof ${dataVar} === 'object' && !Array.isArray(${dataVar}) && ${dataVar}.hasOwnProperty(${key})`,
() => {
codegen.js(`${outputVar}.push(new Value(${inputNodeVar}, ${key}, ${dataVar}[${key}]));`);
},
);
codegen.js(`}`);
}
protected generateIndexSelector(selector: types.IIndexSelector, inputVar: string, outputVar: string): void {
const codegen = this.codegen;
const iVar = codegen.r();
const inputNodeVar = codegen.r();
const dataVar = codegen.r();
const indexVar = codegen.r();
const len = `${inputVar}.length`;
codegen.js(`for (var ${iVar} = 0, ${inputNodeVar}, ${dataVar}, ${indexVar}; ${iVar} < ${len}; ${iVar}++) {`);
codegen.js(`${inputNodeVar} = ${inputVar}[${iVar}];`);
codegen.js(`${dataVar} = ${inputNodeVar}.data;`);
codegen.if(`Array.isArray(${dataVar})`, () => {
codegen.js(`${indexVar} = ${selector.index};`);
codegen.if(`${indexVar} < 0`, () => {
codegen.js(`${indexVar} = ${dataVar}.length + ${indexVar};`);
});
codegen.if(`${indexVar} >= 0 && ${indexVar} < ${dataVar}.length`, () => {
codegen.js(`var child = ${dataVar}[${indexVar}];`);
codegen.if(`child !== undefined`, () => {
codegen.js(`${outputVar}.push(new Value(${inputNodeVar}, ${indexVar}, child));`);
});
});
});
codegen.js(`}`);
}
protected generateWildcardSelector(_selector: types.IWildcardSelector, inputVar: string, outputVar: string): void {
const codegen = this.codegen;
const iVar = codegen.r();
const inputNodeVar = codegen.r();
const dataVar = codegen.r();
const jVar = codegen.r();
const keyVar = codegen.r();
const len = `${inputVar}.length`;
codegen.js(`for (var ${iVar} = 0, ${inputNodeVar}, ${dataVar}; ${iVar} < ${len}; ${iVar}++) {`);
codegen.js(`${inputNodeVar} = ${inputVar}[${iVar}];`);
codegen.js(`${dataVar} = ${inputNodeVar}.data;`);
codegen.if(
`Array.isArray(${dataVar})`,
() => {
codegen.js(`for (var ${jVar} = 0; ${jVar} < ${dataVar}.length; ${jVar}++) {`);
codegen.js(`${outputVar}.push(new Value(${inputNodeVar}, ${jVar}, ${dataVar}[${jVar}]));`);
codegen.js(`}`);
},
() => {
codegen.if(`${dataVar} && typeof ${dataVar} === 'object'`, () => {
codegen.js(`for (var ${keyVar} in ${dataVar}) {`);
codegen.if(`${dataVar}.hasOwnProperty(${keyVar})`, () => {
codegen.js(`${outputVar}.push(new Value(${inputNodeVar}, ${keyVar}, ${dataVar}[${keyVar}]));`);
});
codegen.js(`}`);
});
},
);
codegen.js(`}`);
}
protected generateSliceSelector(selector: types.ISliceSelector, inputVar: string, outputVar: string): void {
const codegen = this.codegen;
const step = selector.step !== undefined ? selector.step : 1;
if (step === 0) return;
const iVar = codegen.var();
const inputNodeVar = codegen.var();
const dataVar = codegen.var();
const lenVar = codegen.var();
const startVar = codegen.var();
const endVar = codegen.var();
const nStartVar = codegen.var();
const nEndVar = codegen.var();
const lowerVar = codegen.var();
const upperVar = codegen.var();
const idxVar = codegen.var();
const len = `${inputVar}.length`;
codegen.js(`for (${iVar} = 0, ${inputNodeVar}, ${dataVar}; ${iVar} < ${len}; ${iVar}++) {`);
codegen.js(`${inputNodeVar} = ${inputVar}[${iVar}];`);
codegen.js(`${dataVar} = ${inputNodeVar}.data;`);
codegen.if(`Array.isArray(${dataVar})`, () => {
codegen.js(`${lenVar} = ${dataVar}.length;`);
// Determine default start and end
if (step >= 0) {
codegen.js(`${startVar} = ${selector.start !== undefined ? selector.start : 0};`);
codegen.js(`${endVar} = ${selector.end !== undefined ? selector.end : lenVar};`);
} else {
codegen.js(`${startVar} = ${selector.start !== undefined ? selector.start : `${lenVar} - 1`};`);
codegen.js(`${endVar} = ${selector.end !== undefined ? selector.end : `-${lenVar} - 1`};`);
}
// Normalize indices
codegen.js(`${nStartVar} = ${startVar} >= 0 ? ${startVar} : ${lenVar} + ${startVar};`);
codegen.js(`${nEndVar} = ${endVar} >= 0 ? ${endVar} : ${lenVar} + ${endVar};`);
// Calculate bounds
if (step > 0) {
codegen.js(`var ${lowerVar} = Math.min(Math.max(${nStartVar}, 0), ${lenVar});`);
codegen.js(`var ${upperVar} = Math.min(Math.max(${nEndVar}, 0), ${lenVar});`);
codegen.js(`for (${idxVar} = ${lowerVar}; ${idxVar} < ${upperVar}; ${idxVar} += ${step}) {`);
codegen.js(`${outputVar}.push(new Value(${inputNodeVar}, ${idxVar}, ${dataVar}[${idxVar}]));`);
codegen.js(`}`);
} else {
codegen.js(`${upperVar} = Math.min(Math.max(${nStartVar}, -1), ${lenVar} - 1);`);
codegen.js(`${lowerVar} = Math.min(Math.max(${nEndVar}, -1), ${lenVar} - 1);`);
codegen.js(`for (${idxVar} = ${upperVar}; ${idxVar} > ${lowerVar}; ${idxVar} += ${step}) {`);
codegen.js(`${outputVar}.push(new Value(${inputNodeVar}, ${idxVar}, ${dataVar}[${idxVar}]));`);
codegen.js(`}`);
}
});
codegen.js(`}`);
}
protected generateFilterSelector(selector: types.IFilterSelector, inputVar: string, outputVar: string): void {
const codegen = this.codegen;
const iVar = codegen.r();
const inputNodeVar = codegen.r();
const dataVar = codegen.r();
const jVar = codegen.r();
const elementVar = codegen.r();
const elementValueVar = codegen.r();
const keyVar = codegen.r();
const memberValueVar = codegen.r();
const memberValueNodeVar = codegen.r();
const lenVar = codegen.var(`${inputVar}.length`);
codegen.js(`for (var ${iVar} = 0, ${inputNodeVar}, ${dataVar}; ${iVar} < ${lenVar}; ${iVar}++) {`);
codegen.js(`${inputNodeVar} = ${inputVar}[${iVar}];`);
codegen.js(`${dataVar} = ${inputNodeVar}.data;`);
// Special case: root-level filter on single object
codegen.if(
`${inputNodeVar}.step === "$" && ${dataVar} && typeof ${dataVar} === "object" && !Array.isArray(${dataVar})`,
() => {
const filterFn1 = this.generateFilterExpression(selector.expression, inputNodeVar);
codegen.if(`${filterFn1}`, () => {
codegen.js(`${outputVar}.push(${inputNodeVar});`);
});
},
() => {
// Array elements
codegen.if(
`Array.isArray(${dataVar})`,
() => {
codegen.js(`for (var ${jVar} = 0; ${jVar} < ${dataVar}.length; ${jVar}++) {`);
codegen.js(`var ${elementVar} = ${dataVar}[${jVar}];`);
codegen.js(`var ${elementValueVar} = new Value(${inputNodeVar}, ${jVar}, ${elementVar});`);
const filterFn2 = this.generateFilterExpression(selector.expression, elementValueVar);
codegen.if(`${filterFn2}`, () => {
codegen.js(`${outputVar}.push(${elementValueVar});`);
});
codegen.js(`}`);
},
() => {
// Object member values
codegen.if(`${dataVar} && typeof ${dataVar} === "object"`, () => {
codegen.js(`for (var ${keyVar} in ${dataVar}) {`);
codegen.if(`${dataVar}.hasOwnProperty(${keyVar})`, () => {
codegen.js(`var ${memberValueVar} = ${dataVar}[${keyVar}];`);
codegen.js(`var ${memberValueNodeVar} = new Value(${inputNodeVar}, ${keyVar}, ${memberValueVar});`);
const filterFn3 = this.generateFilterExpression(selector.expression, memberValueNodeVar);
codegen.if(`${filterFn3}`, () => {
codegen.js(`${outputVar}.push(${memberValueNodeVar});`);
});
});
codegen.js(`}`);
});
},
);
},
);
codegen.js(`}`);
}
protected generateFilterExpression(expression: types.IFilterExpression, currentNodeVar: string): string {
switch (expression.type) {
case 'comparison':
return this.generateComparisonExpression(expression, currentNodeVar);
case 'logical':
return this.generateLogicalExpression(expression, currentNodeVar);
case 'existence':
return this.generateExistenceExpression(expression, currentNodeVar);
case 'negation':
return `!(${this.generateFilterExpression(expression.expression, currentNodeVar)})`;
case 'paren':
return `(${this.generateFilterExpression(expression.expression, currentNodeVar)})`;
case 'function':
return this.generateFunctionExpression(expression, currentNodeVar, true);
default:
return 'false';
}
}
protected generateComparisonExpression(expression: types.IComparisonExpression, currentNodeVar: string): string {
const leftVar = this.generateValueExpression(expression.left, currentNodeVar);
const rightVar = this.generateValueExpression(expression.right, currentNodeVar);
const codegen = this.codegen;
const resultVar = codegen.var();
const leftTempVar = codegen.var(leftVar);
const rightTempVar = codegen.var(rightVar);
codegen.if(
`${leftTempVar} === undefined || ${rightTempVar} === undefined`,
() => {
if (expression.operator === '==') {
codegen.js(`${resultVar} = ${leftTempVar} === undefined && ${rightTempVar} === undefined;`);
} else {
codegen.js(`${resultVar} = false;`);
}
},
() => {
// Generate comparison based on operator
const compareExpr = (() => {
switch (expression.operator) {
case '==':
return this.generateCompareEqual(leftTempVar, rightTempVar);
case '!=':
return `!(${this.generateCompareEqual(leftTempVar, rightTempVar)})`;
case '<':
return this.generateCompareLess(leftTempVar, rightTempVar);
case '<=':
return `${this.generateCompareLess(leftTempVar, rightTempVar)} || ${this.generateCompareEqual(leftTempVar, rightTempVar)}`;
case '>':
return this.generateCompareLess(rightTempVar, leftTempVar);
case '>=':
return `${this.generateCompareLess(rightTempVar, leftTempVar)} || ${this.generateCompareEqual(leftTempVar, rightTempVar)}`;
default:
return 'false';
}
})();
codegen.js(`${resultVar} = ${compareExpr};`);
},
);
return resultVar;
}
protected generateCompareEqual(leftVar: string, rightVar: string): string {
const fnName = this.codegen.r();
const codegen = this.codegen;
codegen.js(`var ${fnName} = function(left, right) {`);
codegen.if(`left === undefined && right === undefined`, () => {
codegen.js(`return true;`);
});
codegen.if(`left === undefined || right === undefined`, () => {
codegen.js(`return false;`);
});
codegen.if(`Array.isArray(left) && left.length === 1`, () => {
codegen.js(`left = left[0];`);
});
codegen.if(`Array.isArray(right) && right.length === 1`, () => {
codegen.js(`right = right[0];`);
});
codegen.if(`left === undefined || right === undefined`, () => {
codegen.js(`return false;`);
});
codegen.if(`left === right`, () => {
codegen.js(`return true;`);
});
codegen.if(`typeof left !== typeof right`, () => {
codegen.js(`return false;`);
});
codegen.if(`Array.isArray(left) && Array.isArray(right)`, () => {
codegen.if(`left.length !== right.length`, () => {
codegen.js(`return false;`);
});
codegen.js(`for (var i = 0; i < left.length; i++) {`);
codegen.if(`!${fnName}(left[i], right[i])`, () => {
codegen.js(`return false;`);
});
codegen.js(`}`);
codegen.js(`return true;`);
});
codegen.if(`left && right && typeof left === "object" && typeof right === "object"`, () => {
codegen.js(`var leftKeys = Object.keys(left);`);
codegen.js(`var rightKeys = Object.keys(right);`);
codegen.if(`leftKeys.length !== rightKeys.length`, () => {
codegen.js(`return false;`);
});
codegen.js(`for (var i = 0; i < leftKeys.length; i++) {`);
codegen.js(`var key = leftKeys[i];`);
codegen.if(`rightKeys.indexOf(key) === -1`, () => {
codegen.js(`return false;`);
});
codegen.if(`!${fnName}(left[key], right[key])`, () => {
codegen.js(`return false;`);
});
codegen.js(`}`);
codegen.js(`return true;`);
});
codegen.js(`return false;`);
codegen.js(`};`);
return `${fnName}(${leftVar}, ${rightVar})`;
}
protected generateCompareLess(leftVar: string, rightVar: string): string {
const codegen = this.codegen;
const fnName = this.codegen.r();
codegen.js(`var ${fnName} = function(left, right) {`);
codegen.if(`left === undefined || right === undefined`, () => {
codegen.js(`return false;`);
});
codegen.if(`Array.isArray(left) && left.length === 1`, () => {
codegen.js(`left = left[0];`);
});
codegen.if(`Array.isArray(right) && right.length === 1`, () => {
codegen.js(`right = right[0];`);
});
codegen.if(`left === undefined || right === undefined`, () => {
codegen.js(`return false;`);
});
codegen.if(`typeof left === "number" && typeof right === "number"`, () => {
codegen.js(`return left < right;`);
});
codegen.if(`typeof left === "string" && typeof right === "string"`, () => {
codegen.js(`return left < right;`);
});
codegen.js(`return false;`);
codegen.js(`};`);
return `${fnName}(${leftVar}, ${rightVar})`;
}
protected generateLogicalExpression(expression: types.ILogicalExpression, currentNodeVar: string): string {
const leftExpr = this.generateFilterExpression(expression.left, currentNodeVar);
const rightExpr = this.generateFilterExpression(expression.right, currentNodeVar);
if (expression.operator === '&&') {
return `(${leftExpr} && ${rightExpr})`;
} else E{
return `(${leftExpr} || ${rightExpr})`;
}
}
protected generateExistenceExpression(expression: types.IExistenceExpression, currentNodeVar: string): string {
const codegen = this.codegen;
const resultVar = codegen.r();
// Create a mini evaluator for the existence test
const tempCodegen = new JsonPathCodegen(expression.path);
const existenceFn = tempCodegen.compile();
const existenceFnVar = codegen.linkDependency(existenceFn);
codegen.js(`var ${resultVar} = ${existenceFnVar}(${currentNodeVar}.data).length > 0;`);
return resultVar;
}
protected generateFunctionExpression(
expression: types.IFunctionExpression,
currentNodeVar: string,
asLogical: boolean,
): string {
const codegen = this.codegen;
const resultVar = codegen.r();
// Link the function implementations
switch (expression.name) {
case 'length':
if (expression.args.length !== 1) {
codegen.js(`var ${resultVar} = undefined;`);
} else {
const argVar = this.generateFunctionArg(expression.args[0], currentNodeVar);
const valueVar = codegen.r();
codegen.js(`var ${valueVar} = ${argVar};`);
codegen.if(`Array.isArray(${valueVar})`, () => {
codegen.js(`${valueVar} = ${valueVar}.length === 1 ? ${valueVar}[0] : undefined;`);
});
codegen.if(
`typeof ${valueVar} === "string"`,
() => {
codegen.js(`var ${resultVar} = [...${valueVar}].length;`);
},
() => {
codegen.if(
`Array.isArray(${valueVar})`,
() => {
codegen.js(`var ${resultVar} = ${valueVar}.length;`);
},
() => {
codegen.if(
`${valueVar} && typeof ${valueVar} === "object" && ${valueVar} !== null`,
() => {
codegen.js(`var ${resultVar} = Object.keys(${valueVar}).length;`);
},
() => {
codegen.js(`var ${resultVar} = undefined;`);
},
);
},
);
},
);
}
break;
case 'count':
Iif (expression.args.length !== 1) {
codegen.js(`var ${resultVar} = 0;`);
} else {
const argVar = this.generateFunctionArg(expression.args[0], currentNodeVar);
const resVar = codegen.r();
codegen.js(`var ${resVar} = ${argVar};`);
codegen.if(
`Array.isArray(${resVar})`,
() => {
codegen.js(`var ${resultVar} = ${resVar}.length;`);
},
() => {
codegen.if(
`${resVar} === undefined`,
() => {
codegen.js(`var ${resultVar} = 0;`);
},
() => {
codegen.js(`var ${resultVar} = 1;`);
},
);
},
);
}
break;
case 'match':
case 'search':
Iif (expression.args.length !== 2) {
codegen.js(`var ${resultVar} = false;`);
} else {
const arg1Var = this.generateFunctionArg(expression.args[0], currentNodeVar);
const arg2Var = this.generateFunctionArg(expression.args[1], currentNodeVar);
const strVar = codegen.r();
const regexVar = codegen.r();
codegen.js(`var ${strVar} = ${arg1Var};`);
codegen.js(`var ${regexVar} = ${arg2Var};`);
codegen.if(`Array.isArray(${strVar})`, () => {
codegen.js(`${strVar} = ${strVar}.length === 1 ? ${strVar}[0] : undefined;`);
});
codegen.if(`Array.isArray(${regexVar})`, () => {
codegen.js(`${regexVar} = ${regexVar}.length === 1 ? ${regexVar}[0] : undefined;`);
});
codegen.if(
`typeof ${strVar} !== "string" || typeof ${regexVar} !== "string"`,
() => {
codegen.js(`var ${resultVar} = false;`);
},
() => {
codegen.js(`try {`);
if (expression.name === 'match') {
codegen.js(`var regExp = new RegExp("^" + ${regexVar} + "$");`);
} else {
codegen.js(`var regExp = new RegExp(${regexVar});`);
}
codegen.js(`var ${resultVar} = regExp.test(${strVar});`);
codegen.js(`} catch (e) {`);
codegen.js(`var ${resultVar} = false;`);
codegen.js(`}`);
},
);
}
break;
case 'value':
Iif (expression.args.length !== 1) {
codegen.js(`var ${resultVar} = undefined;`);
} else {
const argVar = this.generateFunctionArg(expression.args[0], currentNodeVar);
const resVar = codegen.r();
codegen.js(`var ${resVar} = ${argVar};`);
codegen.if(
`Array.isArray(${resVar})`,
() => {
codegen.js(`var ${resultVar} = ${resVar}.length === 1 ? ${resVar}[0] : undefined;`);
},
() => {
codegen.js(`var ${resultVar} = ${resVar};`);
},
);
}
break;
default:
codegen.js(`var ${resultVar} = false;`);
break;
}
// Convert to logical if needed
if (asLogical) {
const logicalVar = codegen.r();
codegen.if(
`typeof ${resultVar} === "boolean"`,
() => {
codegen.js(`var ${logicalVar} = ${resultVar};`);
},
() => {
codegen.if(
`typeof ${resultVar} === "number"`,
() => {
codegen.js(`var ${logicalVar} = ${resultVar} !== 0;`);
},
() => {
codegen.if(
`Array.isArray(${resultVar})`,
() => {
codegen.js(`var ${logicalVar} = ${resultVar}.length > 0;`);
},
() => {
codegen.js(`var ${logicalVar} = ${resultVar} != null;`);
},
);
},
);
},
);
return logicalVar;
}
return resultVar;
}
protected generateFunctionArg(
arg: types.IValueExpression | types.IFilterExpression | types.IJSONPath,
currentNodeVar: string,
): string {
const codegen = this.codegen;
Iif ('segments' in arg) {
const tempCodegen = new JsonPathCodegen(arg as types.IJSONPath);
const argFn = tempCodegen.compile();
const argFnVar = this.codegen.linkDependency(argFn);
const resultVar = codegen.r();
codegen.js(`var ${resultVar} = ${argFnVar}(${currentNodeVar}.data).map(function(v) { return v.data; });`);
return resultVar;
}
return this.generateValueExpression(arg as types.IValueExpression, currentNodeVar);
}
protected generateValueExpression(expression: types.IValueExpression, currentNodeVar: string): string {
const codegen = this.codegen;
switch (expression.type) {
case 'current':
return currentNodeVar + '.data';
case 'root':
return 'data';
case 'literal':
return JSON.stringify(expression.value);
case 'path': {
const tempCodegen = new JsonPathCodegen(expression.path);
const pathFn = tempCodegen.compile();
const pathFnVar = this.codegen.linkDependency(pathFn);
const resultVar = this.codegen.r();
codegen.js(`var ${resultVar} = ${pathFnVar}(${currentNodeVar}.data).map(function(v) { return v.data; });`);
return resultVar;
}
case 'function':
return this.generateFunctionExpression(expression, currentNodeVar, false);
default:
return 'undefined';
}
}
protected genRecursiveDescentSelector(
selector: types.IRecursiveDescentSelector,
inputVar: string,
outputVar: string,
): void {
const codegen = this.codegen;
const iVar = codegen.r();
const inputNodeVar = codegen.r();
const descendantsVar = codegen.r();
const lengthVar = codegen.var(`${inputVar}.length`);
codegen.js(`for (var ${iVar} = 0, ${inputNodeVar}, ${descendantsVar}; ${iVar} < ${lengthVar}; ${iVar}++) {`);
codegen.js(`${inputNodeVar} = ${inputVar}[${iVar}];`);
codegen.js(`${descendantsVar} = [];`);
// Collect descendants
this.genCollectDescendants(inputNodeVar, descendantsVar);
// Apply wrapped selector to descendants
this.generateSelector(selector.selector, descendantsVar, outputVar);
codegen.js(`}`);
}
protected genCollectDescendants(nodeVar: string, outputVar: string): void {
const codegen = this.codegen;
const fnName = codegen.r();
codegen.js(`var ${fnName} = function(node, output) {`);
codegen.js(`output.push(node);`);
codegen.js(`var data = node.data;`);
codegen.if(
`Array.isArray(data)`,
() => {
codegen.js(`for (var i = 0; i < data.length; i++) {`);
codegen.js(`var child = new Value(node, i, data[i]);`);
codegen.js(`${fnName}(child, output);`);
codegen.js(`}`);
},
() => {
codegen.if(`data && typeof data === "object"`, () => {
codegen.js(`for (var key in data) {`);
codegen.if(`data.hasOwnProperty(key)`, () => {
codegen.js(`var child = new Value(node, key, data[key]);`);
codegen.js(`${fnName}(child, output);`);
});
codegen.js(`}`);
});
},
);
codegen.js(`};`);
codegen.js(`${fnName}(${nodeVar}, ${outputVar});`);
}
}
|