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recursivelyBuildAst.ts
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recursivelyBuildAst.ts
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import {
NullASTNodeImpl,
PropertyASTNodeImpl,
StringASTNodeImpl,
ObjectASTNodeImpl,
NumberASTNodeImpl,
ArrayASTNodeImpl,
BooleanASTNodeImpl,
} from './jsonParser07';
import * as Yaml from 'yaml-language-server-parser';
import { ASTNode } from '../jsonASTTypes';
import { parseYamlBoolean } from './scalar-type';
const maxRefCount = 1000;
let refDepth = 0;
export default function recursivelyBuildAst(parent: ASTNode, node: Yaml.YAMLNode): ASTNode {
if (!node) {
return;
}
if (!parent) {
// first invocation
refDepth = 0;
}
if (refDepth > maxRefCount && node.kind === Yaml.Kind.ANCHOR_REF) {
// document contains excessive aliasing
return;
}
switch (node.kind) {
case Yaml.Kind.MAP: {
const instance = <Yaml.YamlMap>node;
const result = new ObjectASTNodeImpl(parent, node.startPosition, node.endPosition - node.startPosition);
for (const mapping of instance.mappings) {
result.properties.push(<PropertyASTNodeImpl>recursivelyBuildAst(result, mapping));
}
return result;
}
case Yaml.Kind.MAPPING: {
const instance = <Yaml.YAMLMapping>node;
const key = instance.key;
const result = new PropertyASTNodeImpl(
parent as ObjectASTNodeImpl,
instance.startPosition,
instance.endPosition - instance.startPosition
);
// Technically, this is an arbitrary node in YAML
// I doubt we would get a better string representation by parsing it
const keyNode = new StringASTNodeImpl(result, key.startPosition, key.endPosition - key.startPosition);
keyNode.value = key.value;
const valueNode = instance.value
? recursivelyBuildAst(result, instance.value)
: new NullASTNodeImpl(parent, instance.endPosition, 0);
valueNode.location = key.value;
result.keyNode = keyNode;
result.valueNode = valueNode;
return result;
}
case Yaml.Kind.SEQ: {
const instance = <Yaml.YAMLSequence>node;
const result = new ArrayASTNodeImpl(parent, instance.startPosition, instance.endPosition - instance.startPosition);
const count = 0;
for (const item of instance.items) {
if (item === null && count === instance.items.length - 1) {
break;
}
// Be aware of https://github.com/nodeca/js-yaml/issues/321
// Cannot simply work around it here because we need to know if we are in Flow or Block
const itemNode = item === null ? new NullASTNodeImpl(parent, instance.endPosition, 0) : recursivelyBuildAst(result, item);
// itemNode.location = count++;
result.children.push(itemNode);
}
return result;
}
case Yaml.Kind.SCALAR: {
const instance = <Yaml.YAMLScalar>node;
const type = Yaml.determineScalarType(instance);
const value = instance.value;
//This is a patch for redirecting values with these strings to be boolean nodes because its not supported in the parser.
const possibleBooleanValues = [
'y',
'Y',
'yes',
'Yes',
'YES',
'n',
'N',
'no',
'No',
'NO',
'on',
'On',
'ON',
'off',
'Off',
'OFF',
];
if (instance.plainScalar && possibleBooleanValues.indexOf(value.toString()) !== -1) {
return new BooleanASTNodeImpl(parent, parseYamlBoolean(value), node.startPosition, node.endPosition - node.startPosition);
}
switch (type) {
case Yaml.ScalarType.null: {
return new NullASTNodeImpl(parent, node.startPosition, node.endPosition - node.startPosition);
}
case Yaml.ScalarType.bool: {
return new BooleanASTNodeImpl(
parent,
Yaml.parseYamlBoolean(value),
node.startPosition,
node.endPosition - node.startPosition
);
}
case Yaml.ScalarType.int: {
const result = new NumberASTNodeImpl(parent, node.startPosition, node.endPosition - node.startPosition);
result.value = Yaml.parseYamlInteger(value);
result.isInteger = true;
return result;
}
case Yaml.ScalarType.float: {
const result = new NumberASTNodeImpl(parent, node.startPosition, node.endPosition - node.startPosition);
result.value = Yaml.parseYamlFloat(value);
result.isInteger = false;
return result;
}
case Yaml.ScalarType.string: {
const result = new StringASTNodeImpl(parent, node.startPosition, node.endPosition - node.startPosition);
result.value = node.value;
return result;
}
}
break;
}
case Yaml.Kind.ANCHOR_REF: {
const instance = (<Yaml.YAMLAnchorReference>node).value;
refDepth++;
return (
recursivelyBuildAst(parent, instance) ||
new NullASTNodeImpl(parent, node.startPosition, node.endPosition - node.startPosition)
);
}
case Yaml.Kind.INCLUDE_REF: {
const result = new StringASTNodeImpl(parent, node.startPosition, node.endPosition - node.startPosition);
result.value = node.value;
return result;
}
}
}