gitea-actions/conditional-variables/evaluate.sh

declare -A context
declare -A outputs
declare -a output_names

matched_any=false

echo "=== CONTEXT ==="
printf '%s\n' "${CONTEXT:-}"

echo
echo "=== RULES ==="
printf '%s\n' "${RULES:-}"

trim() {
    local var="$*"
    var="${var#"${var%%[![:space:]]*}"}"
    var="${var%"${var##*[![:space:]]}"}"
    printf '%s' "$var"
}

load_context() {
    local key
    local value

    while IFS='=' read -r key value; do
        key="$(trim "${key:-}")"
        value="$(trim "${value:-}")"

        [[ -z "$key" ]] && continue
        [[ "$key" =~ ^# ]] && continue

        context["$key"]="$value"
    done <<< "${CONTEXT:-}"
}

evaluate_condition() {
    local condition="$1"

    local variable
    local operator
    local expected
    local actual

    read -r variable operator expected <<< "$condition"

    if [[ -z "${variable:-}" || -z "${operator:-}" || -z "${expected:-}" ]]; then
        echo "Invalid condition: $condition"
        return 1
    fi

    if [[ ! -v context["$variable"] ]]; then
        echo "Unknown context variable '$variable'"
        return 1
    fi

    actual="${context[$variable]}"

    echo "Evaluating: '$variable' actual='$actual' operator='$operator' expected='$expected'"

    case "$operator" in
        "==")
            [[ "$actual" == "$expected" ]]
            ;;

        "!=")
            [[ "$actual" != "$expected" ]]
            ;;

        "contains")
            [[ "$actual" == *"$expected"* ]]
            ;;

        "startsWith")
            [[ "$actual" == "$expected"* ]]
            ;;

        "endsWith")
            [[ "$actual" == *"$expected" ]]
            ;;

        ">"|">="|"<"|"<=")
            if [[ ! "$actual" =~ ^-?[0-9]+$ ]]; then
                echo "Numeric operator '$operator' requires integer value. Actual: '$actual'"
                return 1
            fi

            if [[ ! "$expected" =~ ^-?[0-9]+$ ]]; then
                echo "Numeric operator '$operator' requires integer value. Expected: '$expected'"
                return 1
            fi

            case "$operator" in
                ">")
                    (( actual > expected ))
                    ;;
                ">=")
                    (( actual >= expected ))
                    ;;
                "<")
                    (( actual < expected ))
                    ;;
                "<=")
                    (( actual <= expected ))
                    ;;
            esac
            ;;

        *)
            echo "Unsupported operator: $operator"
            return 1
            ;;
    esac
}

evaluate_conditions() {
    local conditions="$1"
    local condition

    while IFS= read -r condition; do
        condition="$(trim "${condition:-}")"

        [[ -z "$condition" ]] && continue
        [[ "$condition" =~ ^# ]] && continue

        if evaluate_condition "$condition"; then
            return 0
        fi
    done <<< "$conditions"

    return 1
}

store_output() {
    local output="$1"
    local name
    local value

    output="$(trim "${output:-}")"

    [[ -z "$output" ]] && return 0
    [[ "$output" =~ ^# ]] && return 0

    if [[ ! "$output" =~ ^[A-Za-z_][A-Za-z0-9_]*= ]]; then
        echo "Invalid variable definition: $output"
        return 1
    fi

    name="${output%%=*}"
    value="${output#*=}"

    if [[ ! -v outputs["$name"] ]]; then
        output_names+=("$name")
    fi

    outputs["$name"]="$value"

    echo "Set output candidate: $name=$value"
}

apply_variables() {
    local variables="$1"
    local output

    while IFS= read -r output; do
        store_output "$output"
    done <<< "$variables"
}

finalize_rule() {
    local conditions="$1"
    local variables="$2"

    conditions="$(trim "$conditions")"
    variables="$(trim "$variables")"

    [[ -z "$conditions" && -z "$variables" ]] && return 0

    echo
    echo "=== PARSED RULE ==="
    echo "--- conditions ---"
    printf '%s\n' "$conditions"
    echo "--- set ---"
    printf '%s\n' "$variables"

    if [[ -z "$conditions" ]]; then
        echo "Rule has no conditions, skipping"
        return 0
    fi

    if [[ -z "$variables" ]]; then
        echo "Rule has no variables to set, skipping"
        return 0
    fi

    if evaluate_conditions "$conditions"; then
        echo "Rule matched"
        matched_any=true
        apply_variables "$variables"
    else
        echo "Rule did not match"
    fi
}

parse_rules() {
    local line
    local current_conditions=""
    local current_variables=""
    local mode=""

    while IFS= read -r line; do
        line="$(trim "${line:-}")"

        [[ -z "$line" ]] && continue