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state.js
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state.js
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/**
* External dependencies
*/
import { times, get, mapValues, every } from 'lodash';
/**
* Creates a table state.
*
* @param {number} options.rowCount Row count for the table to create.
* @param {number} options.columnCount Column count for the table to create.
*
* @return {Object} New table state.
*/
export function createTable( {
rowCount,
columnCount,
} ) {
return {
body: times( rowCount, () => ( {
cells: times( columnCount, () => ( {
content: '',
tag: 'td',
} ) ),
} ) ),
};
}
/**
* Updates cell content in the table state.
*
* @param {Object} state Current table state.
* @param {string} options.section Section of the cell to update.
* @param {number} options.rowIndex Row index of the cell to update.
* @param {number} options.columnIndex Column index of the cell to update.
* @param {Array} options.content Content to set for the cell.
*
* @return {Object} New table state.
*/
export function updateCellContent( state, {
section,
rowIndex,
columnIndex,
content,
} ) {
return {
[ section ]: state[ section ].map( ( row, currentRowIndex ) => {
if ( currentRowIndex !== rowIndex ) {
return row;
}
return {
cells: row.cells.map( ( cell, currentColumnIndex ) => {
if ( currentColumnIndex !== columnIndex ) {
return cell;
}
return {
...cell,
content,
};
} ),
};
} ),
};
}
/**
* Inserts a row in the table state.
*
* @param {Object} state Current table state.
* @param {string} options.section Section in which to insert the row.
* @param {number} options.rowIndex Row index at which to insert the row.
*
* @return {Object} New table state.
*/
export function insertRow( state, {
section,
rowIndex,
columnCount,
} ) {
const cellCount = columnCount || state[ section ][ 0 ].cells.length;
return {
[ section ]: [
...state[ section ].slice( 0, rowIndex ),
{
cells: times( cellCount, () => ( {
content: '',
tag: section === 'head' ? 'th' : 'td',
} ) ),
},
...state[ section ].slice( rowIndex ),
],
};
}
/**
* Deletes a row from the table state.
*
* @param {Object} state Current table state.
* @param {string} options.section Section in which to delete the row.
* @param {number} options.rowIndex Row index to delete.
*
* @return {Object} New table state.
*/
export function deleteRow( state, {
section,
rowIndex,
} ) {
return {
[ section ]: state[ section ].filter( ( row, index ) => index !== rowIndex ),
};
}
/**
* Inserts a column in the table state.
*
* @param {Object} state Current table state.
* @param {string} options.section Section in which to insert the column.
* @param {number} options.columnIndex Column index at which to insert the column.
*
* @return {Object} New table state.
*/
export function insertColumn( state, {
columnIndex,
} ) {
return mapValues( state, ( section, sectionName ) => {
// Bail early if the table section is empty.
if ( isEmptyTableSection( section ) ) {
return section;
}
return section.map( ( row ) => {
// Bail early if the row is empty or it's an attempt to insert past
// the last possible index of the array.
if ( isEmptyRow( row ) || row.cells.length < columnIndex ) {
return row;
}
return {
cells: [
...row.cells.slice( 0, columnIndex ),
{
content: '',
tag: sectionName === 'head' ? 'th' : 'td',
},
...row.cells.slice( columnIndex ),
],
};
} );
} );
}
/**
* Deletes a column from the table state.
*
* @param {Object} state Current table state.
* @param {string} options.section Section in which to delete the column.
* @param {number} options.columnIndex Column index to delete.
*
* @return {Object} New table state.
*/
export function deleteColumn( state, {
columnIndex,
} ) {
return mapValues( state, ( section ) => {
// Bail early if the table section is empty.
if ( isEmptyTableSection( section ) ) {
return section;
}
return section.map( ( row ) => ( {
cells: row.cells.length >= columnIndex ? row.cells.filter( ( cell, index ) => index !== columnIndex ) : row.cells,
} ) ).filter( ( row ) => row.cells.length );
} );
}
/**
* Toggles the existance of a section.
*
* @param {Object} state Current table state.
* @param {string} section Name of the section to toggle.
*
* @return {Object} New table state.
*/
export function toggleSection( state, section ) {
// Section exists, replace it with an empty row to remove it.
if ( ! isEmptyTableSection( state[ section ] ) ) {
return { [ section ]: [] };
}
// Get the length of the first row of the body to use when creating the header.
const columnCount = get( state, [ 'body', 0, 'cells', 'length' ], 1 );
// Section doesn't exist, insert an empty row to create the section.
return insertRow( state, { section, rowIndex: 0, columnCount } );
}
/**
* Determines whether a table section is empty.
*
* @param {Object} sectionRows Table section state.
*
* @return {boolean} True if the table section is empty, false otherwise.
*/
export function isEmptyTableSection( sectionRows ) {
return ! sectionRows || ! sectionRows.length || every( sectionRows, isEmptyRow );
}
/**
* Determines whether a table row is empty.
*
* @param {Object} row Table row state.
*
* @return {boolean} True if the table section is empty, false otherwise.
*/
export function isEmptyRow( row ) {
return ! ( row.cells && row.cells.length );
}
/**
* Determines if a cell is selected.
*
* @param {Object} cellLocation The cell to check.
* @param {Object} selection The selection data.
*
* @return {boolean} True if the cell is within a selection, false otherwise.
*/
export function isCellSelected( cellLocation, selection ) {
if ( ! cellLocation || ! selection ) {
return false;
}
switch ( selection.type ) {
case 'cell':
return hasSingleCellSelection( cellLocation, selection );
case 'table':
return true;
case 'row':
return hasRowSelection( cellLocation, selection );
case 'column':
return hasColumnSelection( cellLocation, selection );
}
}
/**
* Determines if a cell is the single cell selected.
*
* @param {Object} cellLocation The cell to check.
* @param {Object} selection The selection data.
*
* @return {boolean} True if the cell is within a selection, false otherwise.
*/
export function hasSingleCellSelection( cellLocation, selection ) {
if ( ! cellLocation || ! selection ) {
return false;
}
return selection.type === 'cell' &&
cellLocation.section === selection.section &&
cellLocation.columnIndex === selection.columnIndex &&
cellLocation.rowIndex === selection.rowIndex;
}
/**
* Determines if a cell is within a row selection.
*
* @param {Object} cellLocation The cell to check.
* @param {Object} selection The selection data.
*
* @return {boolean} True if the cell is within a selection, false otherwise.
*/
export function hasRowSelection( cellLocation, selection ) {
if ( ! cellLocation || ! selection ) {
return false;
}
return selection.type === 'row' &&
cellLocation.section === selection.section &&
cellLocation.rowIndex === selection.rowIndex;
}
/**
* Determines if a cell is within a column selection.
*
* @param {Object} cellLocation The cell to check.
* @param {Object} selection The selection data.
*
* @return {boolean} True if the cell is within a selection, false otherwise.
*/
export function hasColumnSelection( cellLocation, selection ) {
if ( ! cellLocation || ! selection ) {
return false;
}
return selection.type === 'column' && cellLocation.columnIndex === selection.columnIndex;
}
/**
* Returns the location of the cell above.
*
* @param {Object} state The table state.
* @param {Object} cellLocation The cell location (section, rowIndex, columnIndex).
*
* @return {?Object} The location of the cell above this one or undefined
* if this cell is at the table perimeter.
*/
export function getCellAbove( state, cellLocation ) {
const { section: sectionName, rowIndex, columnIndex } = cellLocation;
const isFirstRow = rowIndex === 0;
// This is the first row of the first section, return undefined early.
if ( sectionName === 'head' && isFirstRow ) {
return;
}
let sectionNameForRowAbove, previousRowIndex;
// Handle getting the cell from the next section.
if ( isFirstRow ) {
sectionNameForRowAbove = sectionName === 'foot' ? 'body' : 'head';
const previousSection = state[ sectionNameForRowAbove ];
// There is no previous section, return undefined early.
if ( isEmptyTableSection( previousSection ) ) {
return;
}
previousRowIndex = previousSection.length - 1;
} else {
sectionNameForRowAbove = sectionName;
previousRowIndex = rowIndex - 1;
}
// The row above doesn't have as many columns, return undefined early.
const columnCountForRowAbove = state[ sectionNameForRowAbove ][ previousRowIndex ].cells.length;
if ( columnIndex > columnCountForRowAbove - 1 ) {
return;
}
return {
section: sectionNameForRowAbove,
rowIndex: previousRowIndex,
columnIndex,
};
}
/**
* Returns the location of the cell below.
*
* @param {Object} state The table state.
* @param {Object} cellLocation The cell location (section, rowIndex, columnIndex).
*
* @return {?Object} The location of the cell below this one or undefined
* if this cell is at the table perimeter.
*/
export function getCellBelow( state, cellLocation ) {
const { section: sectionName, rowIndex, columnIndex } = cellLocation;
const section = state[ sectionName ];
const rowCount = section.length;
const isLastRow = rowIndex === rowCount - 1;
// This is the last row of the last section, return undefined early.
if ( sectionName === 'foot' && isLastRow ) {
return;
}
let sectionNameForRowBelow, nextRowIndex;
// Handle getting the cell from the next section.
if ( isLastRow ) {
sectionNameForRowBelow = sectionName === 'head' ? 'body' : 'foot';
const nextSection = state[ sectionNameForRowBelow ];
// There is no next section, return undefined early.
if ( isEmptyTableSection( nextSection ) ) {
return;
}
nextRowIndex = 0;
} else {
sectionNameForRowBelow = sectionName;
nextRowIndex = rowIndex + 1;
}
// The row above doesn't have as many columns, return undefined early.
const columnCountForRowBelow = state[ sectionNameForRowBelow ][ nextRowIndex ].cells.length;
if ( columnIndex > columnCountForRowBelow - 1 ) {
return;
}
return {
section: sectionNameForRowBelow,
rowIndex: nextRowIndex,
columnIndex,
};
}
/**
* Returns the location of the cell to the right.
*
* @param {Object} state The table state.
* @param {Object} cellLocation The cell location (section, rowIndex, columnIndex).
*
* @return {?Object} The location of the cell to the right of this one or undefined
* if this cell is at the table perimeter.
*/
export function getCellToRight( state, cellLocation ) {
const { section: sectionName, rowIndex, columnIndex } = cellLocation;
const section = state[ sectionName ];
const columnCount = section[ rowIndex ].cells.length;
const hasCellToRight = columnIndex < columnCount - 1;
return hasCellToRight ? {
...cellLocation,
columnIndex: columnIndex + 1,
} : undefined;
}
/**
* Returns the location of the cell to the left.
*
* @param {Object} cellLocation The cell location (section, rowIndex, columnIndex).
*
* @return {?Object} The location of the cell to the left of this one or undefined
* if this cell is at the table perimeter.
*/
export function getCellToLeft( cellLocation ) {
const { columnIndex } = cellLocation;
const hasCellToLeft = columnIndex > 0;
return hasCellToLeft ? {
...cellLocation,
columnIndex: columnIndex - 1,
} : undefined;
}