polygerrit-ui/app/embed/diff/gr-diff/gr-diff-styles.ts

/**
 * @license
 * Copyright 2023 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
import {css} from 'lit';

export const grDiffStyles = css`
  :host(.disable-context-control-buttons) .section {
    border-right: none;
  }
  :host(.hide-line-length-indicator) .full-width td.content .contentText {
    background-image: none;
  }

  :host {
    font-family: var(--monospace-font-family, ''), 'Roboto Mono';
    font-size: var(--font-size, var(--font-size-code, 12px));
    /* usually 16px = 12px + 4px */
    line-height: calc(
      var(--font-size, var(--font-size-code, 12px)) + var(--spacing-s, 4px)
    );
  }

  .thread-group {
    display: block;
    max-width: var(--content-width, 80ch);
    white-space: normal;
    background-color: var(--diff-blank-background-color);
  }
  .diffContainer {
    max-width: var(--diff-max-width, none);
    font-family: var(--monospace-font-family);
  }
  table {
    border-collapse: collapse;
    table-layout: fixed;
  }
  td.lineNum,
  td.blankLineNum {
    /* Enforces background whenever lines wrap */
    background-color: var(--diff-blank-background-color);
  }

  /* Provides the option to add side borders (left and right) to the line
     number column. */
  td.lineNum,
  td.blankLineNum,
  td.moveControlsLineNumCol,
  td.contextLineNum {
    box-shadow: var(--line-number-box-shadow, unset);
  }

  /* Context controls break up the table visually, so we set the right
     border on individual sections to leave a gap for the divider.

     Also taken into account for max-width calculations in SHRINK_ONLY mode
     (check GrDiff.updatePreferenceStyles). */
  .section {
    border-right: 1px solid var(--border-color);
  }
  .section.contextControl {
    /* Divider inside this section must not have border; we set borders on
       the padding rows below. */
    border-right-width: 0;
  }
  /* Padding rows behind context controls. The diff is styled to be cut
     into two halves by the negative space of the divider on which the
     context control buttons are anchored. */
  .contextBackground {
    border-right: 1px solid var(--border-color);
  }
  .contextBackground.above {
    border-bottom: 1px solid var(--border-color);
  }
  .contextBackground.below {
    border-top: 1px solid var(--border-color);
  }

  .lineNumButton {
    display: block;
    width: 100%;
    height: 100%;
    background-color: var(--diff-blank-background-color);
    box-shadow: var(--line-number-box-shadow, unset);
  }
  td.lineNum {
    vertical-align: top;
  }

  /* The only way to focus this (clicking) will apply our own focus
     styling, so this default styling is not needed and distracting. */
  .lineNumButton:focus {
    outline: none;
  }
  gr-image-viewer {
    width: 100%;
    height: 100%;
    max-width: var(--image-viewer-max-width, 95vw);
    max-height: var(--image-viewer-max-height, 90vh);
    /* Defined by paper-styles default-theme and used in various
       components. background-color-secondary is a compromise between
       fairly light in light theme (where we ideally would want
       background-color-primary) yet slightly offset against the app
       background in dark mode, where drop shadows e.g. around paper-card
       are almost invisible. */
    --primary-background-color: var(--background-color-secondary);
  }
  .image-diff .gr-diff {
    text-align: center;
  }
  .image-diff img {
    box-shadow: var(--elevation-level-1);
    max-width: 50em;
  }
  .image-diff .right.lineNumButton {
    border-left: 1px solid var(--border-color);
  }
  .image-diff label {
    font-family: var(--font-family);
    font-style: italic;
  }
  tbody.binary-diff td {
    font-family: var(--font-family);
    font-style: italic;
    text-align: center;
    padding: var(--spacing-s) 0;
  }
  .diff-row {
    outline: none;
    user-select: none;
  }
  .diff-row.target-row.target-side-left .lineNumButton.left,
  .diff-row.target-row.target-side-right .lineNumButton.right,
  .diff-row.target-row.unified .lineNumButton {
    color: var(--primary-text-color);
  }

  /* Preparing selected line cells with position relative so it allows a
     positioned overlay with 'position: absolute'. */
  .target-row td {
    position: relative;
  }

  /* Defines an overlay to the selected line for drawing an outline without
     blocking user interaction (e.g. text selection). */
  .target-row td::before {
    border-width: 0;
    border-style: solid;
    border-color: var(--focused-line-outline-color);
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    user-select: none;
    content: ' ';
  }

  /* The outline for the selected content cell should be the same in all
     cases. */
  .target-row.target-side-left td.left.content::before,
  .target-row.target-side-right td.right.content::before,
  .unified.target-row td.content::before {
    border-width: 1px 1px 1px 0;
  }

  /* The outline for the sign cell should be always be contiguous
     top/bottom. */
  .target-row.target-side-left td.left.sign::before,
  .target-row.target-side-right td.right.sign::before {
    border-width: 1px 0;
  }

  /* For side-by-side we need to select the correct line number to
     "visually close" the outline. */
  .side-by-side.target-row.target-side-left td.left.lineNum::before,
  .side-by-side.target-row.target-side-right td.right.lineNum::before {
    border-width: 1px 0 1px 1px;
  }

  /* For unified diff we always start the overlay from the left cell. */
  .unified.target-row td.left:not(.content)::before {
    border-width: 1px 0 1px 1px;
  }

  /* For unified diff we should continue the top/bottom border in right
     line number column. */
  .unified.target-row td.right:not(.content)::before {
    border-width: 1px 0;
  }

  .content {
    background-color: var(--diff-blank-background-color);
  }

  /* Describes two states of semantic tokens: whenever a token has a
     definition that can be navigated to (navigable) and whenever
     the token is actually clickable to perform this navigation. */
  .semantic-token.navigable {
    text-decoration-style: dotted;
    text-decoration-line: underline;
  }
  .semantic-token.navigable.clickable {
    text-decoration-style: solid;
    cursor: pointer;
  }

  /* The file line, which has no contentText, add some margin before the
     first comment. We cannot add padding the container because we only
     want it if there is at least one comment thread, and the slotting
     makes :empty not work as expected. */
  .content.file slot:first-child::slotted(.comment-thread) {
    display: block;
    margin-top: var(--spacing-xs);
  }
  .contentText {
    background-color: var(--view-background-color);
  }
  .blank {
    background-color: var(--diff-blank-background-color);
  }
  .image-diff .content {
    background-color: var(--diff-blank-background-color);
  }
  .responsive {
    width: 100%;
  }
  .responsive .contentText {
    white-space: break-spaces;
    word-break: break-all;
  }
  .lineNumButton,
  .content {
    vertical-align: top;
    white-space: pre;
  }
  .contextLineNum,
  .lineNumButton {
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;

    color: var(--deemphasized-text-color);
    padding: 0 var(--spacing-m);
    text-align: right;
  }
  .canComment .lineNumButton {
    cursor: pointer;
  }
  .sign {
    min-width: 1ch;
    width: 1ch;
    background-color: var(--view-background-color);
  }
  .sign.blank {
    background-color: var(--diff-blank-background-color);
  }
  .content {
    /* Set min width since setting width on table cells still allows them
       to shrink. Do not set max width because CJK
       (Chinese-Japanese-Korean) glyphs have variable width. */
    min-width: var(--content-width, 80ch);
    width: var(--content-width, 80ch);
  }
  /* If there are no intraline info, consider everything changed */
  .content.add .contentText .intraline,
  .content.add.no-intraline-info .contentText,
  .sign.add.no-intraline-info,
  .delta.total .content.add .contentText {
    background-color: var(--dark-add-highlight-color);
  }
  .content.add .contentText,
  .sign.add {
    background-color: var(--light-add-highlight-color);
  }
  /* If there are no intraline info, consider everything changed */
  .content.remove .contentText .intraline,
  .content.remove.no-intraline-info .contentText,
  .delta.total .content.remove .contentText,
  .sign.remove.no-intraline-info {
    background-color: var(--dark-remove-highlight-color);
  }
  .content.remove .contentText,
  .sign.remove {
    background-color: var(--light-remove-highlight-color);
  }

  .ignoredWhitespaceOnly .sign.no-intraline-info {
    background-color: var(--view-background-color);
  }

  /* dueToRebase */
  .dueToRebase .content.add .contentText .intraline,
  .delta.total.dueToRebase .content.add .contentText {
    background-color: var(--dark-rebased-add-highlight-color);
  }
  .dueToRebase .content.add .contentText {
    background-color: var(--light-rebased-add-highlight-color);
  }
  .dueToRebase .content.remove .contentText .intraline,
  .delta.total.dueToRebase .content.remove .contentText {
    background-color: var(--dark-rebased-remove-highlight-color);
  }
  .dueToRebase .content.remove .contentText {
    background-color: var(--light-rebased-remove-highlight-color);
  }

  /* dueToMove */
  .dueToMove .sign.add,
  .dueToMove .content.add .contentText,
  .dueToMove .moveControls.movedIn .sign.right,
  .dueToMove .moveControls.movedIn .moveHeader,
  .delta.total.dueToMove .content.add .contentText {
    background-color: var(--diff-moved-in-background);
  }

  .dueToMove.changed .sign.add,
  .dueToMove.changed .content.add .contentText,
  .dueToMove.changed .moveControls.movedIn .sign.right,
  .dueToMove.changed .moveControls.movedIn .moveHeader,
  .delta.total.dueToMove.changed .content.add .contentText {
    background-color: var(--diff-moved-in-changed-background);
  }

  .dueToMove .sign.remove,
  .dueToMove .content.remove .contentText,
  .dueToMove .moveControls.movedOut .moveHeader,
  .dueToMove .moveControls.movedOut .sign.left,
  .delta.total.dueToMove .content.remove .contentText {
    background-color: var(--diff-moved-out-background);
  }

  .delta.dueToMove .movedIn .moveHeader {
    --gr-range-header-color: var(--diff-moved-in-label-color);
  }
  .delta.dueToMove.changed .movedIn .moveHeader {
    --gr-range-header-color: var(--diff-moved-in-changed-label-color);
  }
  .delta.dueToMove .movedOut .moveHeader {
    --gr-range-header-color: var(--diff-moved-out-label-color);
  }

  .moveHeader a {
    color: inherit;
  }

  /* ignoredWhitespaceOnly */
  .ignoredWhitespaceOnly .content.add .contentText .intraline,
  .delta.total.ignoredWhitespaceOnly .content.add .contentText,
  .ignoredWhitespaceOnly .content.add .contentText,
  .ignoredWhitespaceOnly .content.remove .contentText .intraline,
  .delta.total.ignoredWhitespaceOnly .content.remove .contentText,
  .ignoredWhitespaceOnly .content.remove .contentText {
    background-color: var(--view-background-color);
  }

  .content .contentText gr-diff-text:empty:after,
  .content .contentText gr-legacy-text:empty:after,
  .content .contentText:empty:after {
    /* Newline, to ensure empty lines are one line-height tall. */
    content: '\\A';
  }

  /* Context controls */
  .contextControl {
    display: table-row-group;
    background-color: transparent;
    border: none;
    --divider-height: var(--spacing-s);
    --divider-border: 1px;
  }
  /* TODO: Is this still used? */
  .contextControl gr-button gr-icon {
    /* should match line-height of gr-button */
    font-size: var(--line-height-mono, 18px);
  }
  .contextControl td:not(.lineNumButton) {
    text-align: center;
  }

  /* Padding rows behind context controls. Styled as a continuation of the
     line gutters and code area. */
  .contextBackground > .contextLineNum {
    background-color: var(--diff-blank-background-color);
  }
  .contextBackground > td:not(.contextLineNum) {
    background-color: var(--view-background-color);
  }
  .contextBackground {
    /* One line of background behind the context expanders which they can
       render on top of, plus some padding. */
    height: calc(var(--line-height-normal) + var(--spacing-s));
  }

  /* Hide the actual context control buttons */
  :host(.disable-context-control-buttons) .contextControl gr-context-controls {
    display: none;
  }
  /* Maintain a small amount of padding at the edges of diff chunks */
  :host(.disable-context-control-buttons) .contextControl .contextBackground {
    height: var(--spacing-s);
    border-right: none;
  }

  .dividerCell {
    vertical-align: top;
  }
  .dividerRow.show-both .dividerCell {
    height: var(--divider-height);
  }
  .dividerRow.show-above .dividerCell,
  .dividerRow.show-above .dividerCell {
    height: 0;
  }

  .br:after {
    /* Line feed */
    content: '\\A';
  }
  .tab {
    display: inline-block;
  }
  .tab-indicator:before {
    color: var(--diff-tab-indicator-color);
    /* >> character */
    content: '\\00BB';
    position: absolute;
  }
  .special-char-indicator {
    /* spacing so elements don't collide */
    padding-right: var(--spacing-m);
  }
  .special-char-indicator:before {
    color: var(--diff-tab-indicator-color);
    content: '•';
    position: absolute;
  }
  .special-char-warning {
    /* spacing so elements don't collide */
    padding-right: var(--spacing-m);
  }
  .special-char-warning:before {
    color: var(--warning-foreground);
    content: '!';
    position: absolute;
  }
  /* Is defined after other background-colors, such that this
     rule wins in case of same specificity. */
  .trailing-whitespace,
  .content .contentText .trailing-whitespace,
  .trailing-whitespace .intraline,
  .content .contentText .trailing-whitespace .intraline {
    border-radius: var(--border-radius, 4px);
    background-color: var(--diff-trailing-whitespace-indicator);
  }
  #diffHeader {
    background-color: var(--table-header-background-color);
    border-bottom: 1px solid var(--border-color);
    color: var(--link-color);
    padding: var(--spacing-m) 0 var(--spacing-m) 48px;
  }
  gr-diff-element {
    /* for gr-selection-action-box positioning */
    position: relative;
    /* Firefox requires a block to position child elements absolutely */
    display: block;
  }
  #diffTable:focus {
    outline: none;
  }
  #loadingError,
  #sizeWarning {
    display: block;
    margin: var(--spacing-l) auto;
    max-width: 60em;
    text-align: center;
  }
  #loadingError {
    color: var(--error-text-color);
  }
  #sizeWarning gr-button {
    margin: var(--spacing-l);
  }
  .target-row td.blame {
    background: var(--diff-selection-background-color);
  }
  td.lost div {
    background-color: var(--info-background);
  }
  td.lost div.lost-message {
    font-family: var(--font-family, 'Roboto');
    font-size: var(--font-size-normal, 14px);
    line-height: var(--line-height-normal);
    padding: var(--spacing-s) 0;
  }
  td.lost div.lost-message gr-icon {
    padding: 0 var(--spacing-s) 0 var(--spacing-m);
    color: var(--blue-700);
  }

  col.blame {
    display: none;
  }
  td.blame {
    display: none;
    padding: 0 var(--spacing-m);
    white-space: pre;
  }
  :host(.showBlame) col.blame {
    display: table-column;
  }
  :host(.showBlame) td.blame {
    display: table-cell;
  }
  td.blame > span {
    opacity: 0.6;
  }
  td.blame > span.startOfRange {
    opacity: 1;
  }
  td.blame .blameDate {
    font-family: var(--monospace-font-family);
    color: var(--link-color);
    text-decoration: none;
  }
  .responsive td.blame {
    overflow: hidden;
    width: 200px;
  }
  /** Support the line length indicator **/
  .responsive td.content .contentText {
    /* Same strategy as in
       https://stackoverflow.com/questions/1179928/how-can-i-put-a-vertical-line-down-the-center-of-a-div
       */
    background-image: linear-gradient(
      var(--line-length-indicator-color),
      var(--line-length-indicator-color)
    );
    background-size: 1px 100%;
    background-position: var(--line-limit-marker) 0;
    background-repeat: no-repeat;
  }
  .newlineWarning {
    color: var(--deemphasized-text-color);
    text-align: center;
  }
  .newlineWarning.hidden {
    display: none;
  }
  .lineNum.COVERED .lineNumButton {
    color: var(
      --coverage-covered-line-num-color,
      var(--deemphasized-text-color)
    );
    background-color: var(--coverage-covered, #e0f2f1);
  }
  .lineNum.NOT_COVERED .lineNumButton {
    color: var(
      --coverage-covered-line-num-color,
      var(--deemphasized-text-color)
    );
    background-color: var(--coverage-not-covered, #ffd1a4);
  }
  .lineNum.PARTIALLY_COVERED .lineNumButton {
    color: var(
      --coverage-covered-line-num-color,
      var(--deemphasized-text-color)
    );
    background: linear-gradient(
      to right bottom,
      var(--coverage-not-covered, #ffd1a4) 0%,
      var(--coverage-not-covered, #ffd1a4) 50%,
      var(--coverage-covered, #e0f2f1) 50%,
      var(--coverage-covered, #e0f2f1) 100%
    );
  }

  // TODO: Investigate whether this CSS is still necessary.
  /* BEGIN: Select and copy for Polymer 2 */
  /* Below was copied and modified from the original css in gr-diff-selection.html. */
  .content,
  .contextControl,
  .blame {
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
  }

  .selected-left:not(.selected-comment)
    .side-by-side
    .left
    + .content
    .contentText,
  .selected-right:not(.selected-comment)
    .side-by-side
    .right
    + .content
    .contentText,
  .selected-left:not(.selected-comment)
    .unified
    .left.lineNum
    ~ .content:not(.both)
    .contentText,
  .selected-right:not(.selected-comment)
    .unified
    .right.lineNum
    ~ .content
    .contentText,
  .selected-left.selected-comment .side-by-side .left + .content .message,
  .selected-right.selected-comment
    .side-by-side
    .right
    + .content
    .message
    :not(.collapsedContent),
  .selected-comment .unified .message :not(.collapsedContent),
  .selected-blame .blame {
    -webkit-user-select: text;
    -moz-user-select: text;
    -ms-user-select: text;
    user-select: text;
  }

  /* Make comments and check results selectable when selected */
  .selected-left.selected-comment ::slotted(.comment-thread[diff-side='left']),
  .selected-right.selected-comment
    ::slotted(.comment-thread[diff-side='right']) {
    -webkit-user-select: text;
    -moz-user-select: text;
    -ms-user-select: text;
    user-select: text;
  }
  /* END: Select and copy for Polymer 2 */

  .whitespace-change-only-message {
    background-color: var(--diff-context-control-background-color);
    border: 1px solid var(--diff-context-control-border-color);
    text-align: center;
  }

  .token-highlight {
    background-color: var(--token-highlighting-color, #fffd54);
  }

  gr-selection-action-box {
    /* Needs z-index to appear above wrapped content, since it's inserted
       into DOM before it. */
    z-index: 120;
  }

  gr-diff-image-new,
  gr-diff-image-old,
  gr-diff-section,
  gr-context-controls-section,
  gr-diff-row {
    display: contents;
  }
`;