xsd-parser 1.5.2

#!/usr/bin/env bash

set -euo pipefail

ROOT="${DOWNLOAD_ROOT:-.}"

log() {
    echo "$@" >&2
}

escape() {
    printf '%s' "$1" | sed 's/[#&]/\\&/g';
}

abs_url() {
    local PARENT="$1"
    local CHILD="$2"

    case "$CHILD" in
        http://*|https://*)
            echo "$CHILD"
            ;;
        //* )
            echo "${PARENT%%:*}:$CHILD"
            ;;
        /*)
            local SCH="${PARENT%%:*}";
            local REST="${PARENT#*://}"
            local HOST="${REST%%/*}";
            echo "$SCH://$HOST$CHILD"
            ;;
        *)
            echo "${PARENT%/*}/$CHILD"
            ;;
    esac
}

rel_path() {
    local i=0;
    local TO="$(readlink -f "$2")"
    local TO="${TO%/}"
    local FROM="$(readlink -f "$1")"
    local FROM="${FROM%/}"

    IFS="/" read -r -a A <<< "${FROM#/}"
    IFS="/" read -r -a B <<< "${TO#/}"

    while [[ $i -lt ${#A[@]} && $i -lt ${#B[@]} && "${A[i]}" == "${B[i]}" ]]; do
        ((i++));
    done

    local rel=""
    local up=$(( ${#A[@]} - i ));

    for ((j=0; j<up; j++)); do
        rel+="../"
    done

    for ((j=i; j<${#B[@]}; j++)); do
        rel+="${B[j]}"
        [[ $j -lt $((${#B[@]}-1)) ]] && rel+="/"
    done

    [[ -z "$rel" ]] && rel="."

    printf '%s' "$rel"
}

download() {
    local PARENT="$1"
    local URL="$2"
    local URL="$(abs_url "$PARENT" "$URL")"

    local REL="${URL#*//}"
    local ABS="$ROOT/$REL"
    local DIR="${ABS%/*}"

    echo "$ABS"

    if [[ -f "$ABS" ]]; then
        return
    fi

    log "Download:
    Schema $URL
    To $REL
    "

    mkdir -p "$DIR"
    curl -L -o "$ABS" "$URL" 2>/dev/null

    mapfile -t URLS < <(
        grep -oE "schemaLocation=['\"][^'\"]*['\"]" "$ABS" |
        sed -E "s/^schemaLocation=['\"](.*)['\"]$/\1/" |
        sort -u
    )

    for CHILD in "${URLS[@]}"; do
        local CHILD_ABS="$(download "$URL" "$CHILD")"
        local CHILD_REL="$(rel_path "$DIR" "$CHILD_ABS")"

        local OLD="$(escape "$CHILD")";
        local NEW="$(escape "$CHILD_REL")"

        sed -i "s#schemaLocation=[\"']$OLD[\"']#schemaLocation=\"$NEW\"#g" "$ABS"
    done
}

for URL in "$@"; do
    download "$URL" "$URL" >/dev/null
done