generate-object-position-png-tests.sh

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#!/bin/bash

# Any copyright is dedicated to the Public Domain.

# http://creativecommons.org/publicdomain/zero/1.0/

# This is a script that I used to generate a suite of tests for the CSS

# properties "object-fit" and "object-position" (focusing on edge-case

# object-position values that require pixel rounding), using a template

# testcase file and reference case file.

# The reference case uses the "background-size" & "background-position"

# equivalent of the tested "object-fit" / "object-position" values.

FILE_PATH="./"

REFTEST_LIST_FILE="$FILE_PATH/reftest.list"

TEMPLATE_TESTCASE_FILENAME=$FILE_PATH/support/template-object-position-test.html

TEMPLATE_REFERENCE_FILENAME=$FILE_PATH/support/template-object-position-ref.html

imageFileFormat="png"

# Array of image files to use for testing:

imageFileArr=("support/colors-16x8.png" "support/colors-8x16.png")

numImageFiles=${#imageFileArr[@]}

# Array of CSS classes to delete from the template, for a given image-file.

# DETAILS: The template files contain some elements/styles that exercise

# object-position x-values (op_x), and other elements/styles that exercise

# object-position y-values (op_y). But actually, we'll only have extra space

# for these percent values to resolve against in *one* dimension (since our

# image-files are rectangular, and the container element is square, and we

# scale the image up with "object-fit: contain"). So, we delete the

# elements/styles in the dimension where object-position % values will just

# resolve to 0 ("op_x" for the fat image, and "op_y" for the tall image).

classPatternToDeleteArr=("op_x" "op_y")

# Array of tag-names for elements that we'd like to test:

# (Also: array of a single-letter abbreviation for each element, an array of

# the close tag for each element -- if a close tag is needed -- and an array

# indicating the attribute that each element uses to specify its image source.)

tagNameArr=(       "embed" "img" "object"    "video" )

tagLetterArr=(     "e"     "i"   "o"         "p" )

tagCloseTokenArr=( ""      ""    "</object>" "</video>" )

tagSrcAttrArr=(        "src"   "src" "data"      "poster" )

numTags=${#tagNameArr[@]}

  for ((j = 0; j < $numImageFiles; j++)); do

    imageFile=${imageFileArr[$j]}

    classPatternToDelete=${classPatternToDeleteArr[$j]}

    let testNum=$j+1

    testNum="00$testNum" # zero-pad to 3 digits, per w3c convention

    filenameStub="object-position-$imageFileFormat-$testNum"

    # Generate a reference case:

    filenameRef="$filenameStub-ref.html"

    echo Generating ${filenameRef}.

    cat $TEMPLATE_REFERENCE_FILENAME \

      | sed "s,REPLACEME_IMAGE_FILENAME,$imageFile," \

      | sed "/$classPatternToDelete/d" \

      > $FILE_PATH/$filenameRef

    # Generate a test for each of our tags:

    for ((k = 0; k < $numTags; k++)); do

      tagName=${tagNameArr[$k]}

      tagLetter=${tagLetterArr[$k]}

      tagCloseToken=${tagCloseTokenArr[$k]}

      tagSrcAttr=${tagSrcAttrArr[$k]}

      filenameTest="$filenameStub$tagLetter.html"

      testTitle="various 'object-position' values on a fixed-size $tagName element, with a PNG image and 'object-fit:contain'."

      echo Generating ${filenameTest}.

      cat $TEMPLATE_TESTCASE_FILENAME \

        | sed "s,REPLACEME_IMAGE_FILENAME,$imageFile," \

        | sed "s/REPLACEME_TEST_TITLE/$testTitle/" \

        | sed "s,REPLACEME_REFERENCE_FILENAME,$filenameRef," \

        | sed "s/REPLACEME_CONTAINER_TAG/$tagName/" \

        | sed "s,REPLACEME_CONTAINER_CLOSETAG,$tagCloseToken,"  \

        | sed "s/REPLACEME_SRC_ATTR/$tagSrcAttr/" \

        | sed "/$classPatternToDelete/d" \

        > $FILE_PATH/$filenameTest

      echo "== $filenameTest $filenameRef" \

        >> $REFTEST_LIST_FILE

    done

  done