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import { mutateSegment } from './mutate';
import type {
ReadonlyContentModelParagraph,
ReadonlyContentModelSegment,
ReadonlyContentModelText,
} from 'roosterjs-content-model-types';
const SPACE = '\u0020';
const NONE_BREAK_SPACE = '\u00A0';
const LEADING_SPACE_REGEX = /^\u0020+/;
const TRAILING_SPACE_REGEX = /\u0020+$/;
/**
* @internal
*/
export function normalizeAllSegments(paragraph: ReadonlyContentModelParagraph) {
const context = resetNormalizeSegmentContext();
paragraph.segments.forEach(segment => {
normalizeSegment(paragraph, segment, context);
});
normalizeTextSegments(paragraph, context.textSegments, context.lastInlineSegment);
normalizeLastTextSegment(paragraph, context.lastTextSegment, context.lastInlineSegment);
}
/**
* Normalize a given segment, make sure its spaces are correctly represented by space and non-break space
* @param segment The segment to normalize
* @param ignoreTrailingSpaces Whether we should ignore the trailing space of the text segment @default false
*/
export function normalizeSingleSegment(
paragraph: ReadonlyContentModelParagraph,
segment: ReadonlyContentModelSegment,
EignoreTrailingSpaces: boolean = false
) {
const context = resetNormalizeSegmentContext();
context.ignoreTrailingSpaces = ignoreTrailingSpaces;
normalizeSegment(paragraph, segment, context);
}
/**
* @internal Export for test only
*/
export interface NormalizeSegmentContext {
textSegments: ReadonlyContentModelText[];
ignoreLeadingSpaces: boolean;
ignoreTrailingSpaces: boolean;
lastTextSegment: ReadonlyContentModelText | undefined;
lastInlineSegment: ReadonlyContentModelSegment | undefined;
}
/**
* @internal Export for test only
*/
export function createNormalizeSegmentContext(): NormalizeSegmentContext {
return resetNormalizeSegmentContext();
}
function resetNormalizeSegmentContext(
context?: Partial<NormalizeSegmentContext>
): NormalizeSegmentContext {
return Object.assign(context ?? {}, {
textSegments: [],
ignoreLeadingSpaces: true,
ignoreTrailingSpaces: true,
lastInlineSegment: undefined,
lastTextSegment: undefined,
});
}
/**
* @internal Export for test only
*/
export function normalizeSegment(
paragraph: ReadonlyContentModelParagraph,
segment: ReadonlyContentModelSegment,
context: NormalizeSegmentContext
) {
switch (segment.segmentType) {
case 'Br':
normalizeTextSegments(paragraph, context.textSegments, context.lastInlineSegment);
normalizeLastTextSegment(paragraph, context.lastTextSegment, context.lastInlineSegment);
// Line ends, reset all states
resetNormalizeSegmentContext(context);
break;
case 'Entity':
case 'General':
case 'Image':
// Here "inline segment" means a segment showing some content inline such as text, image, or other inline HTML elements
// BR will end current line, so it is not treated as "inline" here.
// We will do some normalization to the trailing spaces for non-inline-segments
context.lastInlineSegment = segment;
context.ignoreLeadingSpaces = false;
break;
case 'Text':
context.textSegments.push(segment);
context.lastInlineSegment = segment;
context.lastTextSegment = segment;
const first = segment.text.substring(0, 1);
const last = segment.text.substr(-1);
if (!hasSpacesOnly(segment.text)) {
if (first == SPACE) {
// 1. Multiple leading space => single or empty (depends on if previous segment ends with space)
mutateSegment(paragraph, segment, textSegment => {
textSegment.text = textSegment.text.replace(
LEADING_SPACE_REGEX,
context.ignoreLeadingSpaces ? '' : NONE_BREAK_SPACE
);
});
}
if (last == SPACE) {
// 2. Multiple trailing space => single space
mutateSegment(paragraph, segment, textSegment => {
textSegment.text = textSegment.text.replace(
TRAILING_SPACE_REGEX,
context.ignoreTrailingSpaces ? SPACE : NONE_BREAK_SPACE
);
});
}
}
context.ignoreLeadingSpaces = last == SPACE;
break;
}
}
function normalizeTextSegments(
paragraph: ReadonlyContentModelParagraph,
segments: ReadonlyContentModelText[],
lastInlineSegment: ReadonlyContentModelSegment | undefined
) {
segments.forEach(segment => {
// 3. Segment ends with replace it with space if the previous char is not space so that next segment can wrap
// Only do this for segments that is not the last one since the last space will be removed in step 4
if (segment != lastInlineSegment) {
const text = segment.text;
if (
text.substr(-1) == NONE_BREAK_SPACE &&
text.length > 1 &&
text.substr(-2, 1) != SPACE
) {
mutateSegment(paragraph, segment, textSegment => {
textSegment.text = text.substring(0, text.length - 1) + SPACE;
});
}
}
});
}
function normalizeLastTextSegment(
paragraph: ReadonlyContentModelParagraph,
segment: ReadonlyContentModelText | undefined,
lastInlineSegment: ReadonlyContentModelSegment | undefined
) {
if (segment && segment == lastInlineSegment && segment?.text.substr(-1) == SPACE) {
// 4. last text segment of the paragraph, remove trailing space
mutateSegment(paragraph, segment, textSegment => {
textSegment.text = textSegment.text.replace(TRAILING_SPACE_REGEX, '');
});
}
}
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