| 49 | }; |
| 50 | |
| 51 | const getDeindentedStyleTextAndOffsets = ( |
| 52 | styleText: string, |
| 53 | node: TaggedTemplateExpression |
| 54 | ) => { |
| 55 | const baseIndentation = (node.quasi.loc?.end.column ?? 1) - 1; |
| 56 | const sourceLines = styleText.split('\n'); |
| 57 | const baseIndentations = new Map<number, number>(); |
| 58 | const indentationPattern = new RegExp(`^[ \\t]{${baseIndentation}}`); |
| 59 | const emptyLinePattern = /^[ \\t\r]*$/; |
| 60 | const deindentedLines: string[] = []; |
| 61 | const prefixOffsets = { lines: 0, offset: 0 }; |
| 62 | |
| 63 | // remove the first line if it's an empty string and update the prefix |
| 64 | // offset to be the lines 1 instead of lines 0 |
| 65 | if ( |
| 66 | sourceLines.length > 1 && |
| 67 | sourceLines[0] !== undefined && |
| 68 | emptyLinePattern.test(sourceLines[0]) |
| 69 | ) { |
| 70 | prefixOffsets.lines = 1; |
| 71 | prefixOffsets.offset = sourceLines[0].length + 1; |
| 72 | sourceLines.shift(); |
| 73 | } |
| 74 | |
| 75 | // go through each source line and deindent lines |
| 76 | for (let i = 0; i < sourceLines.length; i++) { |
| 77 | const sourceLine = sourceLines[i]; |
| 78 | if (sourceLine !== undefined) { |
| 79 | // if the sourceline has the indentation pattern |
| 80 | if (indentationPattern.test(sourceLine)) { |
| 81 | deindentedLines.push(sourceLine.replace(indentationPattern, '')); |
| 82 | baseIndentations.set(i + 1, baseIndentation); |
| 83 | // Roots don't have an end line, so we can't look this up so easily |
| 84 | // later on. Having a special '-1' key helps here. |
| 85 | if (i === sourceLines.length - 1) { |
| 86 | baseIndentations.set(-1, baseIndentation); |
| 87 | } |
| 88 | } else { |
| 89 | deindentedLines.push(sourceLine); |
| 90 | } |
| 91 | } |
| 92 | } |
| 93 | |
| 94 | const deindentedStyleText = deindentedLines.join('\n'); |
| 95 | return { deindentedStyleText, prefixOffsets, baseIndentations }; |
| 96 | }; |
| 97 | |
| 98 | /** |
| 99 | * Parses CSS from within tagged template literals in a JavaScript document |