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Closes #129
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,26 @@ | ||
| import type { Resource } from 'rdf-object'; | ||
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| /** | ||
| * Transforms a resource based on the contents of an override step. | ||
| */ | ||
| export interface IOverrideStep { | ||
| /** | ||
| * Determines if this handler can apply the given override step to the resource. | ||
| * | ||
| * @param config - The resource to override. | ||
| * @param step - The override step to apply. | ||
| * | ||
| * @returns true if this handler should be used. | ||
| */ | ||
| canHandle: (config: Resource, step: Resource) => boolean; | ||
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| /** | ||
| * Applies the changes described in the given override step to the resource. | ||
| * | ||
| * @param config - The resource to override. | ||
| * @param step - The override step to apply. | ||
| * | ||
| * @returns The modified resource. | ||
| */ | ||
| handle: (config: Resource, step: Resource) => Resource; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,31 @@ | ||
| import type { Resource } from 'rdf-object'; | ||
| import { PREFIX_OO } from '../../rdf/Iris'; | ||
| import type { IOverrideStep } from './IOverrideStep'; | ||
| import { extractOverrideStepFields, findResourceIndex, getPropertyResourceList } from './OverrideUtil'; | ||
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| /** | ||
| * Override step that inserts elements in a list after a specific element. | ||
| * | ||
| * Uses the following override step fields: | ||
| * - `overrideParameter`: Parameter of the original object that contains the list. | ||
| * - `overrideTarget`: Element already in the list that is used as reference. This can be a named node or a literal. | ||
| * - `overrideValue`: Element(s) to insert immediately after the target element. | ||
| */ | ||
| export class OverrideListInsertAfter implements IOverrideStep { | ||
| public canHandle(config: Resource, step: Resource): boolean { | ||
| return step.property.type.value === PREFIX_OO('OverrideListInsertAfter'); | ||
| } | ||
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| public handle(config: Resource, step: Resource): Resource { | ||
| const { parameters, targets, values } = extractOverrideStepFields(step, { parameters: 1, targets: 1 }); | ||
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| const list = getPropertyResourceList(config, parameters[0]); | ||
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| const index = findResourceIndex(list, targets[0]); | ||
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| // +1 so we start after the selected element | ||
| list.splice(index + 1, 0, ...values); | ||
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| return config; | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,45 @@ | ||
| import type { Resource } from 'rdf-object'; | ||
| import { PREFIX_OO } from '../../rdf/Iris'; | ||
| import { ErrorResourcesContext } from '../../util/ErrorResourcesContext'; | ||
| import type { IOverrideStep } from './IOverrideStep'; | ||
| import { extractOverrideStepFields, getPropertyResourceList } from './OverrideUtil'; | ||
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| /** | ||
| * Override step that inserts elements in a list at a specific index. | ||
| * A negative index can be used to count from the back of the list. | ||
| * An index of `-0` can be used to insert at the end of the list. | ||
| * | ||
| * Uses the following override step fields: | ||
| * - `overrideParameter`: Parameter of the original object that contains the list. | ||
| * - `overrideTarget`: A literal containing the index. | ||
| * - `overrideValue`: Element(s) to insert at the chosen index. | ||
| */ | ||
| export class OverrideListInsertAt implements IOverrideStep { | ||
| public canHandle(config: Resource, step: Resource): boolean { | ||
| return step.property.type.value === PREFIX_OO('OverrideListInsertAt'); | ||
| } | ||
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| public handle(config: Resource, step: Resource): Resource { | ||
| const { parameters, targets, values } = extractOverrideStepFields(step, { parameters: 1, targets: 1 }); | ||
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| const list = getPropertyResourceList(config, parameters[0]); | ||
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| const val = targets[0].value; | ||
| if (!/^-?\d+$/u.test(val)) { | ||
| throw new ErrorResourcesContext(`Invalid index in Override step OverrideListInsertAt for parameter ${parameters[0].value}: ${val}`, { | ||
| config, | ||
| step, | ||
| }); | ||
| } | ||
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| // Support adding elements at the end using -0 | ||
| if (val === '-0') { | ||
| list.push(...values); | ||
| } else { | ||
| const index = Number.parseInt(val, 10); | ||
| list.splice(index, 0, ...values); | ||
| } | ||
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| return config; | ||
| } | ||
| } |
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